阅读说明：本技术 自觉式验光装置 (Self-sensing optometry device ) 是由 小林俊洋 平山幸人 铃木陵司 柴田一徳 马场大辅 于 2018-06-06 设计创作，主要内容包括：本发明提供一种自觉式验光装置,用于自觉性地测定被检眼的光学特性,具备：投影光学系统,具有视标呈现部并朝向被检眼投影视标光束；壳体,收纳投影光学系统；呈现窗,用于使视标光束从壳体的内部朝向外部射出；眼屈光度测定单元,设于壳体的外部；及保持单元,将壳体与眼屈光度测定单元一体地连结并保持眼屈光度测定单元,在使用眼屈光度测定单元的情况下,来自视标呈现部的视标光束向被检眼投影的光路中的从呈现窗至眼屈光度测定单元之间的第一距离为180mm以下。(The present invention provides a subjective refraction device for measuring optical characteristics of an eye to be examined, comprising: a projection optical system having a target presenting section and projecting a target beam toward an eye to be inspected; a housing that houses the projection optical system; a presentation window for allowing the sighting mark light beam to be emitted from the inside of the housing toward the outside; an eye diopter measuring unit provided outside the housing; and a holding unit that integrally connects the housing and the eye diopter measurement unit to hold the eye diopter measurement unit, wherein when the eye diopter measurement unit is used, a first distance from the presentation window to the eye diopter measurement unit in an optical path along which the optotype beam from the optotype presenting portion is projected onto the eye to be inspected is 180mm or less.)

1. A subjective optometry apparatus is provided with:

a projection optical system having a target presenting section that emits a target beam, and projecting the target beam toward an eye to be inspected;

a housing that houses the projection optical system;

a presentation window provided in the housing, for emitting the sighting mark light beam from the inside of the housing toward the outside;

an eye diopter measurement unit provided outside the housing and configured to change an optical characteristic of the sighting target light beam emitted from the housing; and

a holding unit that integrally connects the housing and the diopter measurement unit and holds the diopter measurement unit,

the subjective refraction device is configured to measure optical characteristics of the eye to be examined by projecting the sighting target light beam having passed through the eye diopter measurement unit to the eye to be examined,

when the eye diopter measurement unit is used, a first distance from the presentation window to the eye diopter measurement unit in an optical path along which the optotype light beam from the optotype presenting portion is projected onto the eye to be inspected is 180mm or less.

2. Subjective refraction device according to claim 1,

the projection optical system includes an optical member that guides an image of the sighting target light beam to the eye to be inspected so as to be a predetermined inspection distance optically, and projects the sighting target light beam toward the eye to be inspected by causing the sighting target light beam emitted from the sighting target presenting part to enter while being offset with respect to an optical axis of the optical member,

in order to be able to measure the optical characteristics of the eye to be inspected with the first distance consciously, the target presenting unit and the optical member are disposed so that a second distance from the target presenting unit to the optical member in the optical path is any one of 540mm to 570 mm.

3. Subjective refraction device according to claim 2,

the optical component is a concave mirror and,

the incidence angle of the sighting mark light beam relative to the concave mirror is less than 10 degrees.

4. Subjective refraction apparatus according to claim 1 or 2,

in order to be able to measure the optical characteristics of the eye to be inspected with the first distance consciously, the presentation window has a horizontal dimension of 130mm or more and a vertical dimension of 50mm or more.

5. Subjective refraction apparatus according to claim 1 or 2,

in order to enable the optical characteristics of the eye to be measured to be consciously measured at the first distance, the presentation window has a horizontal dimension of 270mm or less and a vertical dimension of 190mm or less.

6. Subjective refraction device according to claim 2,

the optical component is a concave mirror and,

the projection optical system includes a reflection member that reflects the target light beam emitted from the target presenting unit toward the concave mirror and guides the target light beam reflected by the concave mirror from the inside of the housing to the outside.

7. The subjective refraction device according to claim 1 or 2, comprising:

a moving means having a driving means for moving a position of the eye diopter measuring means, the eye diopter measuring means being movable between an inspection position in front of the eye to be inspected and a retracted position by driving of the driving means; and

and a control unit that controls the moving unit by driving the driving unit to move the eye diopter measuring unit between an inspection position in front of the eye to be inspected and a retracted position.

8. Subjective refraction device according to claim 7,

the moving means can move the eye diopter measurement means to a retreat position above the inspection position.

9. Subjective refraction apparatus according to claim 1 or 2,

the holding unit integrally connects the diopter measurement unit to the upper surface of the housing.

10. Subjective refraction apparatus according to claim 1 or 2,

when the eye diopter measurement unit is used, the inspection window of the eye diopter measurement unit is disposed to face the presentation window.

Technical Field

The present disclosure relates to a subjective refraction device that consciously measures optical characteristics of an eye to be examined.

Background

There is known a subjective refraction device that uses an eye diopter measurement unit disposed in front of an eye of a subject, arranges optical elements such as a spherical lens and a cylindrical (astigmatic) lens in an inspection window of the eye diopter measurement unit, and inspects (measures) the diopter scale of the subject's eye by presenting an optotype to the subject's eye through the arranged optical elements (see patent document 1). At this time, the examinee confirms the recognition of the presented optotype by observing the examination window of the eye diopter measurement unit. In recent years, there has been studied a subjective refraction device in which a space is saved by shortening a distance between an eye diopter measurement unit and a housing that houses a projection optical system having a visual target presenting portion.

Prior art documents

Patent document

Patent document 1: japanese laid-open patent publication No. 5-176893

Disclosure of Invention

However, in a spectacle store, a hospital, or the like, a room in which the subjective refraction device is installed may be small, and when the subjective refraction device is arranged, the room may be occupied. Therefore, a subjective optometry apparatus which can be arranged in a space-saving manner is desired. Accordingly, although a subjective refraction device has been studied which takes into consideration the reduction of space by shortening the distance between the eye diopter measurement means and the housing accommodating the projection optical system having the target presenting portion, the reduction of space causes a problem of distortion of the target image and a problem that the target light flux is deviated in the middle of being guided to the eye to be inspected, and thus the target light flux cannot be projected to the eye to be inspected satisfactorily.

In view of the above-described conventional technology, a technical object of the present disclosure is to provide a subjective refraction device capable of performing a high-precision subjective examination even when the subjective refraction device is space-saving.

In order to solve the above problem, the present invention is characterized by having the following configuration.

(1) A subjective refraction device according to a first aspect of the present disclosure includes: a projection optical system including a target presenting unit that emits a target light flux and an optical member that guides an image of the target light flux to the eye to be inspected so as to be optically a predetermined inspection distance, the projection optical system projecting the target light flux toward the eye to be inspected by causing the target light flux emitted from the target presenting unit to enter the eye to be inspected while being offset from an optical axis of the optical member; a housing that houses the projection optical system; a presentation window provided in the housing, for emitting the sighting mark light beam from the inside of the housing toward the outside; an eye diopter measurement unit provided outside the housing and configured to change an optical characteristic of the sighting target light beam emitted from the housing; and a holding unit that integrally couples the housing and the eye diopter measurement unit and holds the eye diopter measurement unit, wherein the subjective refraction apparatus is configured to measure optical characteristics of the eye to be inspected by projecting the target light beam having passed through the eye diopter measurement unit onto the eye to be inspected, and when the eye diopter measurement unit is used, a first distance from the presentation window to the eye diopter measurement unit in an optical path on which the target light beam from the target presentation portion is projected onto the eye to be inspected is 180mm or less.

Drawings

Fig. 1A is a perspective view showing the subjective refraction device from the front left side.

Fig. 1B is a perspective view showing the subjective refraction device from the right side of the front surface.

Fig. 2 is a perspective view showing the subjective refraction device from the back side.

Fig. 3A shows an internal configuration of the holding unit when the eye diopter measurement unit moves to the retracted position.

Fig. 3B shows an internal structure of the holding unit when the eye diopter measurement unit is moved to the inspection position.

Fig. 4A shows an optical configuration at the time of remote inspection.

Fig. 4B shows an optical configuration at the time of proximity inspection.

Fig. 5 is a diagram for explaining the observation unit.

Fig. 6 is a diagram showing an eye diopter measurement unit.

Fig. 7 is a schematic configuration diagram of a control system of the subjective refraction device.

Fig. 8 is a diagram showing a state in which the diopter measurement unit is lowered to the front surface of the housing.

Detailed Description

< summary >

Hereinafter, a typical embodiment will be described with reference to the drawings. Fig. 1 to 8 are diagrams for explaining the subjective refraction device according to the present embodiment. In addition, items classified by < > below may be used independently or in association with each other.

In the following description, the depth direction of the subjective refraction device (the front-back direction of the subject during measurement of the subject) is referred to as the Z direction, the horizontal direction on a plane perpendicular to the depth direction (the left-right direction of the subject during measurement of the subject) is referred to as the X direction, and the vertical direction (the up-down direction of the subject during measurement of the subject) is referred to as the Y direction.

For example, the subjective refraction device (for example, the subjective refraction device 1) of the present embodiment may include a projection optical system (for example, the projection optical system 10) having a target presenting part (for example, the display 11) that emits a target light flux and an optical member (for example, the concave mirror 13) that guides an image of the target light flux to the eye to be inspected so as to be optically a predetermined inspection distance, and the target light flux emitted from the target presenting part may be incident to the eye to be inspected while being deviated from an optical axis of the optical member and projected toward the eye.

For example, the subjective refraction device may include a housing (e.g., housing 2) that houses the projection optical system. For example, the subjective refraction device may include a presentation window (for example, presentation window 3) provided in the housing for emitting the sighting mark light beam from the inside of the housing to the outside. For example, the subjective refraction device may include an eye diopter measurement unit (for example, the eye diopter measurement unit 50) that changes the optical characteristics of the optical target beam emitted from the housing. For example, the diopter measuring unit may be provided outside the housing.

For example, the subjective refraction device may include a holding unit (e.g., a holding arm 35) that integrally couples the housing and the diopter measurement unit and holds the diopter measurement unit. For example, the holding unit may integrally couple the diopter measurement unit to the upper surface of the housing. Of course, the holding unit may be configured to integrally connect the casing and the diopter measurement unit at a position different from the above.

For example, when the diopter measurement unit is used (for example, when the diopter measurement unit is disposed at the inspection position), the inspection window (for example, the inspection window 53) of the diopter measurement unit may be disposed so as to face the presentation window of the housing.

For example, the subjective refraction device of the present embodiment is used to measure the optical characteristics of the eye to be examined by projecting the sighting target light beam that has passed through the eye diopter measurement unit onto the eye to be examined. For example, the optical characteristics of the eye to be inspected, which are measured consciously, include an diopter (for example, spherical power, astigmatic axis angle, etc.), contrast sensitivity, binocular vision function (for example, an amount of tilt, a stereoscopic vision function, etc.), and the like.

For example, in the case where the eye diopter measurement unit is used (for example, in the case where the eye diopter measurement unit is disposed at the inspection position), the first distance (for example, the distance W) from the presentation window of the housing to the eye diopter measurement unit in the optical path of the eye chart projected to the eye to be inspected by the eye chart presentation unit may be 180mm or less. That is, for example, the first distance in the depth direction (Z direction) from the presentation window to the eye diopter measurement unit in the optical path in which the optotype light beam from the optotype presenting section is projected onto the eye to be inspected may be 180mm or less (e.g., 70mm, 66mm, 50mm, 10mm, etc.). For example, the first distance may be a distance from a presentation window of the housing to an inspection window of the eye diopter determination unit. The inspection window of the diopter measurement unit may be an inspection window on the subject side (for example, the inspection window 53b) or may be an inspection window on the housing side (for example, the inspection window 53 a). In the present embodiment, the first distance of 180mm or less includes a structure in which the first distance is substantially 180mm or less.

For example, the subjective refraction device may be configured such that the holding unit connects the diopter measurement unit and the housing to each other by 180mm or less so that the first distance is 180mm or less. For example, the subjective refraction device may be configured such that the holding unit connects the diopter measurement unit and the housing to each other by 180mm or less so that the first distance is 180mm or less.

As described above, for example, the subjective refraction device includes a projection optical system including a target presenting section that emits a target light flux and an optical member that guides an image of the target light flux to the eye to be inspected so as to be optically a predetermined inspection distance, and projects the target light flux toward the eye to be inspected by causing the target light flux emitted from the target presenting section to enter the optical member with a deviation from an optical axis of the optical member. Further, for example, the subjective refraction device includes: a housing that houses the projection optical system; a presentation window provided in the housing, for emitting the sighting mark light beam from the inside of the housing toward the outside; an eye diopter measurement unit provided outside the housing and changing optical characteristics of the sighting target light beam emitted from the housing; and a holding unit that integrally connects the case and the eye diopter measurement unit and holds the eye diopter measurement unit, wherein the subjective refraction apparatus is used for measuring the optical characteristics of the eye to be inspected by projecting the sighting target light beam passing through the eye diopter measurement unit to the eye to be inspected. For example, in the case of using the eye diopter measurement unit, the subjective refraction device is configured such that a first distance from the presentation window to the eye diopter measurement unit in an optical path along which the target light beam from the target presentation section is projected onto the eye to be examined is 180mm or less. With this configuration, it is possible to save space of the subjective refraction device and to perform a high-precision subjective examination even in a subjective refraction device in which the diopter measurement unit is integrated with the housing.

For example, in the case of using the eye diopter measurement means, the first distance from the presentation window of the housing to the eye diopter measurement means in the optical path of the optotype beam projected from the optotype presenting section to the eye to be inspected may be 10mm or more. That is, the first distance may be any one of 10mm to 180 mm. For example, since a space is created between the diopter measurement unit and the housing when the first distance is 10mm or more, interference between the diopter measurement unit and the housing can be suppressed when the diopter measurement unit is moved (for example, when the unit is moved between the inspection position and the retracted position).

For example, the subjective refraction device may be configured such that the visual target presenting unit and the optical member are disposed such that a second distance (for example, a distance W1+ W2) from the visual target presenting unit to the optical member in the optical path is any one of 540mm to 570mm (for example, 550mm, 555mm, 560mm, and the like) in order to enable the optical characteristics of the eye to be measured with the first distance. That is, the second distance may be set according to the first distance. In this way, for example, in order to enable the optical characteristics of the eye to be inspected to be measured with a conscious awareness at the first distance, the target presenting part and the optical member may be arranged such that a second distance from the target presenting part to the optical member in an optical path of the target light beam projected onto the eye to be inspected from the target presenting part is any one of 540mm to 570 mm. Thus, the space of the subjective optometry apparatus can be saved, and the subjective examination with high precision can be performed.

For example, the subjective refraction apparatus may be configured to allow the eye to see a visual target at a position of 5m (a virtual image may be formed at an image point position of 5m from the eye) in the distance examination, and may be configured to be capable of consciously measuring the optical characteristics of the eye at the first distance. For example, the subjective refraction device may be configured to project the target light beam emitted from the target presenting unit onto the eye to be inspected in a state of being less deformed, and may be configured to be capable of measuring the optical characteristics of the eye to be inspected with the first distance. Further, for example, the subjective refraction device may be a configuration that saves space for the subjective refraction device, and the configuration may be a configuration that can consciously measure the optical characteristics of the eye to be inspected at the first distance.

For example, as a space-saving subjective refraction device, it is possible that, in a state where the eye refractive power measurement unit is disposed at the inspection position, the dimension in the depth direction (the length from the back surface of the housing to the front surface of the eye refractive power measurement unit (the front surface of the subject side of the eye refractive power measurement unit)) is 550mm or less (for example, 540mm, 519mm, 510mm, and the like), the dimension (length) in the horizontal direction (X direction) is 570mm or less (for example, 560mm, 550mm, 540mm, and the dimension (length) in the vertical direction (Y direction) is 780mm or less (770mm, 763mm, 750mm, and the like). Needless to say, the space-saving subjective refraction device is not limited to the above dimensions.

For example, the subjective refraction device may set the curvature of the optical member corresponding to the second distance. For example, the curvature of the optical member may be configured such that the focal length of the optical member is any one of 620mm to 650 mm. Of course, the curvature of the optical member is not limited to the focal length. In this way, for example, by setting the curvature of the optical member according to the second distance, even when the second distance differs depending on the projection optical system, the optotype can be presented at a predetermined magnification.

For example, the optical member that guides the image of the sighting mark light beam to the eye to be inspected so as to be optically at a predetermined inspection distance may be at least one of a concave mirror, a mirror, and the like. For example, when the optical member is a concave mirror, the incidence angle of the sighting mark light beam with respect to the concave mirror may be 10 ° or less. In this case, for example, the visual target presenting part and the concave mirror may be arranged so that the incidence angle of the visual target beam with respect to the concave mirror becomes 10 ° or less. The incident angle may be an angle formed by an axis of the visual target presenting unit with respect to a normal direction of the screen (optical axis of the visual target presenting unit) and an optical axis of the concave mirror. Thus, for example, in the present embodiment, the optical member may be a concave mirror, and the angle of incidence of the sighting mark light beam with respect to the concave mirror may be 10 ° or less. This can suppress deformation and aberration caused by the concave mirror, and can perform a high-precision subjective examination.

For example, in the subjective refraction device, the presentation window may have a horizontal dimension of 130mm or more and a vertical dimension of 50mm or more so that the optical characteristics of the eye to be inspected can be measured intuitively at the first distance. In this case, the angle of view of the inspector looking into the inspection window may be 40 °, for example. Of course, different angles of view are possible. In this case, as an example, the distance (PD) between the optical axes of the left and right inspection windows of the diopter measurement unit may be 85 mm. Of course, the PD may be a different distance. In this way, for example, in order for the subjective refraction device to be able to consciously measure the optical characteristics of the eye to be inspected at the first distance, the presentation window may have a dimension in the horizontal direction of 130mm or more and a dimension in the vertical direction of 50mm or more. Thus, in the case of the integrated subjective refraction device, when the examinee observes the visual target presenting portion through the optometry window, narrowing of the angle of view when looking into the optometry window can be suppressed, and the subjective examination can be performed satisfactorily. Further, when the optotype presenting part is viewed through the optometry window, the frame of the presentation window can be seen, whereby the adjustment force of the eye to be inspected can be suppressed from acting, and a high-precision subjective inspection can be performed.

In the present embodiment, an example is given in which the presentation window has a horizontal dimension of 130mm or more and a vertical dimension of 50mm or more, but the present invention is not limited to this. For example, the presentation window may have a size of a range larger than a range of an angle of view of the subject when viewing from the inspection window (for example, an angle of view of the inspection window). That is, the frame of the presentation window only needs to be deviated from the angle of view. The size of the optotype presenting part may be changed according to the size of the presentation window.

For example, in order to enable the subjective refraction device to measure the optical characteristics of the eye to be inspected at the first distance, the presentation window may have a horizontal dimension of 270mm or less and a vertical dimension of 190mm or less. Thus, in the case of the integrated subjective refraction device, when the visual target presenting part is observed through the refraction window, the guiding of the disturbance light reflected by the presentation window to the eye to be inspected and the difficulty in confirming the visual target due to the disturbance light entering the inside of the housing can be suppressed, and the subjective examination with high precision can be performed. The size of the optotype presenting part may be changed according to the size of the presentation window.

< projection optical System >

For example, the projection optical system may have at least 1 or more optical components or the like that project the sighting mark light beam toward the eye to be inspected.

For example, the projection optical system projects the optotype light flux toward the eye to be inspected by causing the optotype light flux emitted from the optotype presenting unit to enter while being offset from the optical axis of the optical member. In this case, for example, the visual target presenting unit may be arranged such that a normal direction of the visual target presenting unit with respect to the screen is inclined with respect to the optical axis of the optical member.

For example, in the case where the optical member is a concave mirror, the projection optical system may be configured to include a reflecting member (for example, the flat mirror 12) that reflects the target light beam emitted from the target presenting unit toward the concave mirror and guides the target light beam reflected by the concave mirror from the inside of the housing to the outside. With this configuration, the number of components of the projection optical system can be further reduced, and the space of the subjective refraction device can be further saved. Of course, the projection optical system is not limited to the above configuration, and may be configured so that the sighting target light flux emitted from the sighting target presenting part is incident while being deviated from the optical axis of the optical member, and the sighting target light flux is projected toward the eye to be inspected.

For example, the reflecting member may be any of a mirror (e.g., a total reflection mirror, a half mirror, or the like), a prism, and the like. Of course, the reflecting member is not limited to this, and may be any member as long as it guides the optotype beam toward the eye to be inspected.

For example, the inclination angle of the reflecting member may be any one of inclination angles of 30 ° to 40 ° (e.g., 34 °, 36 °, 38 °, etc.). By designing the inclination angle of the reflecting member to be any one of 30 ° to 40 °, the space saving of the subjective refraction device can be further achieved. Of course, the inclination angle of the reflecting member is not limited to this, and various inclination angles can be designed. The inclination angle of the reflecting member may be an inclination angle with respect to an optical axis (an optical axis set to project the optotype onto the eye from the front direction) of the optotype beam reflected by the reflecting member toward the eye to be inspected (for example, the optical axis L4). For example, the inclination angle of the reflecting member may be an angle formed by the optical axis of the sighting target light beam reflected by the reflecting member toward the eye to be inspected and the optical axis of the reflecting member (the axis in the normal direction of the reflecting surface of the reflecting member).

For example, the optotype presenting unit may be configured to use a display. For example, as the display, lcd (liquid Crystal display), organic el (electro luminescence), or the like can be used. For example, an examination optotype such as a long-range optotype or the like is displayed on the display. For example, dmd (digital micro mirror device) can be used as the optotype presenting section. Typically, a DMD is highly reflective and bright. Therefore, the light amount of the sighting mark light beam can be maintained compared with the case of using a liquid crystal display using polarized light.

For example, the visual target presenting unit may be configured to include a visual light source for presenting visual targets and a visual target plate. In this case, the visual target plate is, for example, a rotatable circular plate and has a plurality of visual targets. The plurality of optotypes include optotypes for visual acuity test used in subjective measurement, for example. For example, optotypes for visual acuity test are prepared for each visual acuity value (visual acuity values 0.1, 0.3, …, 1.5). For example, the target plate is rotated by a motor or the like, and the targets are switched and arranged on the optical path for guiding the target beams to the eye to be inspected. Of course, as the visual target presenting part for projecting the visual target beam, a visual target presenting part other than the above-described structure may be used.

For example, in the present embodiment, the projection optical system may have a right-eye projection optical system and a left-eye projection optical system provided as a pair on the left and right. In this case, for example, a pair of left and right optotype presenting portions may be used. For example, the right-eye projection optical system and the left-eye projection optical system may be configured such that a member constituting the right-eye projection optical system and a member constituting the left-eye projection optical system are formed of the same member. For example, the right-eye projection optical system and the left-eye projection optical system may be configured such that at least a part of the members configuring the right-eye projection optical system and the members configuring the left-eye projection optical system are different members. For example, the right-eye projection optical system and the left-eye projection optical system may be configured to be shared by at least a part of the members constituting the right-eye projection optical system and the members constituting the left-eye projection optical system. For example, the right-eye projection optical system and the left-eye projection optical system may be configured such that a member constituting the right-eye projection optical system and a member constituting the left-eye projection optical system are separately provided.

< Ocular diopter measurement Unit >

For example, the diopter measurement unit changes the optical characteristics (for example, at least one of the spherical power number, the cylindrical power, the cylindrical axis, the polarization characteristics, the aberration amount, and the like) of the sighting target light beam. For example, the optical characteristics of the sighting mark light beam can be changed by controlling the optical element. For example, the ocular refraction measuring unit may be a structure using a wavefront modulation element. For example, the diopter measurement unit may be configured to include a pair of left and right lens chamber units in which optical elements are arranged in a switchable manner in the inspection window.

< Mobile Unit >

For example, the subjective refraction device may be provided with a moving unit (e.g., the moving unit 6). For example, the moving means may be configured to include a driving means (for example, the driving unit 30) for moving the position of the eye diopter measurement means, and the eye diopter measurement means may be moved between the inspection position in front of the eye to be inspected and the retracted position by driving of the driving means. For example, the subjective refraction device may include a control unit (e.g., the control unit 80). For example, the control means may control the moving means by driving the driving means so that the eye diopter measuring means moves between the inspection position in front of the eye to be inspected and the retracted position.

For example, the movement of the eye diopter measurement unit can be easily performed by automatically moving the eye diopter measurement unit between the inspection position in front of the eye to be inspected and the retreat position.

For example, the moving means may be configured to move the diopter measurement means to a retreat position above the test position. Thus, since the diopter measurement means can be retracted without crossing the face of the subject, it is possible to provide a subjective refraction device capable of further suppressing excessive contact. Further, even if other members are disposed around the subjective refraction device, the possibility of excessive contact between the diopter measurement unit and the other members can be suppressed.

Further, for example, the moving means may be configured to be able to move the eye diopter measurement means from the inspection position to a retracted position in a horizontal direction (for example, at least one of a left direction and a right direction). Of course, for example, the moving means may be configured to be able to move the eye diopter measurement means from the inspection position to a retracted position in an arbitrary direction.

In the present embodiment, the configuration in which the diopter measurement means can be moved between the inspection position in front of the eye of the subject and the retracted position by driving the driving means is described as an example, but the present invention is not limited to this. For example, the diopter measurement unit may be moved manually.

< example >

The following describes the structure of the subjective refraction device of the present embodiment. For example, fig. 1A and 1B are perspective views showing the subjective refraction device 1 from the front side. For example, fig. 2 is a perspective view showing the subjective refraction device 1 of the present embodiment from the back side. In the present embodiment, the side where the presentation window 3 described later is located is the front side of the subjective refraction device 1, and the side where the observation window 41 described later is located is the back side of the subjective refraction device 1. For example, fig. 1A is a perspective view showing the subjective refraction device 1 from the front left side. Fig. 1B is a perspective view showing the optometric apparatus 1 from the right side of the front surface, for example.

For example, the subjective refraction device 1 includes a housing 2, a presentation window 3, a holding unit 4, a first operation unit 8, a second operation unit 9, a projection optical system 10, an observation unit 40, an eye diopter measurement unit 50, and the like. In the present embodiment, the elbow rest 90 is provided in the subjective refraction device 1. For example, by setting the placement elbow 90, the examination can be performed in a stable state. For example, even when the examiner performs the examination in a standing state, the examination can be performed in a stable posture by performing the examination in a state where the elbow is placed on the elbow rest 90, and the subjective examination with high accuracy can be performed. It should be noted that an arm to be gripped by the hand of the examinee may be further provided at the elbow rest 90. The examination can be performed with the posture more stabilized by placing the elbow at the elbow rest 90 and grasping the arm with the hand.

For example, in the present embodiment, the subject faces the front surface of the housing 2. For example, the housing 2 houses the projection optical system 10 therein. For example, the presentation window 3 is used to present an examination optotype to an eye of a subject (hereinafter, referred to as an eye to be examined). For example, the presentation window 3 transmits the sighting mark light beam of the projection optical system 10. Therefore, the sighting mark light beam passing through the presentation window 3 is projected to the eye to be inspected. For example, the display window 3 is closed by a transparent panel to prevent the intrusion of dust and the like. For example, as the transparent panel, a transparent member such as an acrylic resin or a glass plate can be used. In the present embodiment, for example, the size of the presentation window 3 may be 184mm in the horizontal direction and 99mm in the vertical direction. Of course, the size of the presentation window 3 is not limited thereto. For example, the presentation window 3 may have a horizontal dimension of 130mm or more and a vertical dimension of 50mm or more. Further, for example, the presentation window may have a size of 270mm or less in the horizontal direction and 190mm or less in the vertical direction.

When the eye diopter measurement unit 50 is disposed between the presentation window 3 and the eye to be inspected, the eye to be inspected is projected with the sighting mark light flux passing through the presentation window 3 and the inspection window 53 of the eye diopter measurement unit 50.

For example, the holding unit 4 holds the eye diopter measurement unit 50. For example, the eye diopter measurement unit 50 is supported at the retreat position or the inspection position by the holding unit 4. For example, as shown in fig. 1A and 1B, the retracted position in the present embodiment is a state in which the eye diopter measurement unit 50 is raised to the upper portion of the housing 2. As shown in fig. 8, the examination position in the present embodiment is a state in which the diopter measurement unit 50 is lowered to the front surface of the housing 2. The switching between the retracted position and the inspection position is performed by moving the holding arm 35 (see fig. 3A and 3B) of the holding unit 4 up and down by the moving unit 6 (see fig. 3A and 3B) of the holding unit 4. In the present embodiment, the holding unit 4 is provided in which the holding arm 35 is integrally formed with the moving unit 6. Of course, the holding arm 35 and the moving unit 6 may be separately provided.

< holding means >

The holding unit 4 will be described in detail below. For example, fig. 3A and 3B show schematic diagrams of the internal structure of the holding unit 4 when the exterior cover is removed. In fig. 3A and 3B, the diopter measuring unit 50 connected to the support arm 35 is omitted. For example, fig. 3A shows the internal structure of the holding unit 4 when the eye diopter measurement unit 50 moves to the retracted position. For example, fig. 3B shows the internal structure of the holding unit 4 when the eye diopter measurement unit 50 is moved to the inspection position.

For example, the holding unit 4 includes the connecting portion 5, the moving unit 6, the base 31, the holding arm 35, and the like. For example, the holding unit 4 is connected to the diopter measurement unit 50 via the connection unit 5. For example, the coupling portion 5 is coupled to the holding arm 35 so as to be rotatable about a rotation axis R3. For example, the holding arm 35 is rotatably attached to the base 31. For example, the base 31 is provided on the upper surface of the housing 2. For example, the base 31 is coupled to the housing 2 via a coupling portion 33. For example, the base 31 is fixedly disposed on the housing 2 via the connection portion 33. In the present embodiment, a configuration in which the base 31 and the coupling portion 33 are provided separately is described as an example, but the present invention is not limited to this. The base 31 and the coupling portion 33 may be integrally formed. In this case, for example, the base 31 may be coupled to the housing 2.

For example, the moving unit 6 includes a driving unit (e.g., a motor) 30, a shaft 7, a support member 85, a block 32, a block holder 36, a support member 38, a block holder 39, a detector 70, a light shielding portion 71, an elongated hole 72, a regulating member 75, an elongated hole 76, a bearing 77, and the like. The moving unit 6 may be configured to include at least the motor 30. For example, the motor 30 is fixed to the holding arm 35 and coupled to an upper portion of the shaft 7. For example, the shaft 7 has a screw portion, not shown, at a lower portion thereof, and is fitted to the support member 85. That is, the support member 85 has a screw portion, not shown, at a portion through which the shaft 7 penetrates in order to be fitted to the shaft 7. For example, the support member 85 is attached to the base 31. For example, the support member 85 supports the shaft 7 to be rotatable with respect to the base 31 around a rotation axis (central axis) R1 of the support member 85. For example, the holding arm 35 is attached to the base 31 via the support member 38. For example, the support member 38 supports the holding arm 35 to be rotatable with respect to the base 31 about a rotation axis (central axis) R2 of the support member 38.

For example, the block 32 is coupled to the support member 38. For example, the block 32 is rotatable with respect to the base 31 around the rotation axis R2 of the support member 38 in accordance with the rotation of the support member 38. For example, the block holder 36 and the block holder 39 are fixed to the base 31. For example, the block holder 36 and the block holder 39 are configured to contact the block 32 at different predetermined positions. For example, when the block 32 rotates with respect to the base 31 around the rotation axis R2 of the support member 38 as the support member 38 rotates, the block 32 comes into contact with the block holder 36 or 39 provided on the base 31 when the block 32 rotates to a predetermined position, and the rotation of the block 32 is stopped. For example, in the present embodiment, the block holder 36 is disposed at a position where the block holder 36 contacts the block 32 and the rotation of the block 32 stops when the diopter measurement unit 50 reaches the inspection position from the retracted position. For example, in the present embodiment, the block holder 39 is disposed at a position where the block holder 39 comes into contact with the block 32 and rotation of the block 32 is stopped when the diopter measurement unit 50 reaches the retracted position from the inspection position.

For example, an operation from a state in which the eye power measuring unit 50 is disposed at the retracted position as shown in fig. 3A to a state in which the eye power measuring unit 50 is disposed at the inspection position as shown in fig. 3B will be described. For example, the shaft 7 is rotated by driving the motor 30. For example, the shaft 7 rotates by the forward rotation of the motor 30. The rotation of the shaft 7 rotates the screw portion of the shaft 7, and moves relative to the support member 85 screwed to the screw portion of the shaft 7. That is, the shaft 7 moves in the axial direction of the shaft 7 with respect to the support member 85. For example, the shaft 7 moves relative to the support member 85, and the number of portions of the shaft 7 protruding from the support member 85 increases (the shaft 7 becomes longer). For example, the support member 85 rotates in the arrow a direction about the rotation axis R1 in conjunction with the movement of the shaft 7 with a large number of projecting portions.

For example, the support member 85 rotates about the rotation axis R1, and the shaft 7 also rotates about the rotation axis R1. That is, the shaft 7 moves in the axial direction of the shaft 7 with respect to the support member 85, and rotates in the arrow a direction around the rotation axis R1. For example, the motor 30 coupled to the shaft 7 by the rotation of the shaft 7 rotates in the arrow a direction about the rotation axis R1. For example, the holding arm 35 to which the motor 30 is fixed rotates in the arrow a direction integrally with the rotation of the motor 30 around the rotation axis R2 of the support member 38. Thereby, the coupling section 5 coupled to the holding arm 35 rotates in the arrow a direction, and the diopter measurement unit 50 coupled to the coupling section 5 rotates in the arrow a direction. For example, the coupling section 5 is rotated relative to the holding arm 35 by the weight of the diopter measurement unit 50 so that the diopter measurement unit 5 can maintain a vertical state. Note that, in the present embodiment, the vertical state includes a substantially vertical state. Thereby, for example, the eye diopter measurement unit 50 moves from the retracted position shown in fig. 3A to the inspection position shown in fig. 3B. That is, the eye diopter measurement unit 50 can be moved downward.

For example, the rotation of the diopter measurement unit 50 in the a direction (movement to the inspection position) is stopped by the block 32 and the block holder 36 when the diopter measurement unit 50 reaches the inspection position. For example, the block 32 rotates in the a direction about the rotation axis R2 in accordance with the driving of the motor 30, and comes into contact with the block holder 36 when the diopter measurement unit 50 reaches the inspection position. For example, the block 32 stops rotating by contacting the block seat 36. For example, the rotation of the support member 38 coupled to the block 32 is stopped by the stop of the block 32. In addition, the rotation of the shaft 7 and the support member 85 is also stopped. Thereby, the eye diopter measurement unit 50 is stopped at the inspection position. That is, the diopter measurement unit 50 is stopped at the inspection position by the block 32 and the block holder 36.

For example, the rotation of the diopter measurement unit 50 in the a direction (movement to the inspection position) is stopped by the block 32 and the block holder 36 when the diopter measurement unit 50 reaches the inspection position, and then the motor 30 is continuously driven. For example, the shaft 7 is rotated by driving of the motor 30, but the shaft 7 is in a state of being immovable by the block 32 and the block holder 36. At this time, for example, the movement of the shaft 7 relative to the support member 85 in the axial direction of the shaft 7 is stopped, and the support member 85 starts moving relative to the shaft 7. That is, the driving by the motor 30 is switched from the movement of the shaft 7 to the movement of the support member 85. For example, after the support member 85 starts moving, when the support member 85 moves to a predetermined position, the driving of the motor 30 is stopped.

Thus, the movement of the eye diopter measurement unit 50 to the inspection position is completed. For example, when the diopter measurement unit 50 moves to the test position, a switching mechanism for switching from the movement of the shaft 7 to the movement of the support member 85 can be used as a contact suppression mechanism when the mechanism comes into contact with another member.

For example, the operation from the state in which the eye power measuring unit 50 is disposed at the inspection position as shown in fig. 3B to the state in which the eye power measuring unit 50 is disposed at the retreat position as shown in fig. 3A will be described. For example, the shaft 7 is rotated by the reverse rotation of the motor 30. By the rotation of the shaft 7, for example, the shaft 7 moves in the axial direction of the shaft 7 with respect to the support member 85 and the protruding portion of the shaft 7 from the support member 85 decreases (the shaft 7 becomes shorter). For example, the support member 85 rotates in the arrow B direction about the rotation axis R1 in conjunction with the movement of shortening the shaft 7. Similarly to the above description, the coupling section 5 coupled to the holding arm 35 is rotated in the arrow B direction about the rotation axis R2 by the support member 85 being rotated about the rotation axis R1, and the diopter measurement unit 50 coupled to the coupling section 5 is rotated in the arrow B direction. For example, the coupling portion 5 is rotated relative to the holding arm 35 by the weight of the diopter measurement unit 50 so that the diopter measurement unit 5 can be held in a vertical state. Thereby, for example, the diopter measurement unit 50 moves from the inspection position shown in fig. 3B to the retracted position shown in fig. 3A. That is, the diopter measurement unit 50 can be moved from above.

For example, the rotation of the diopter measurement unit 50 in the B direction (movement to the retreat position) is stopped by the block 32 and the block holder 39 when the diopter measurement unit 50 reaches the retreat position. For example, the block 32 rotates in the B direction about the rotation axis R2 in accordance with the driving of the motor 30, and comes into contact with the block holder 39 when the diopter measurement unit 50 reaches the retracted position. For example, the block 32 stops rotating by contacting the block seat 39. For example, the rotation of the support member 38 coupled to the block 32 is stopped by the stop of the block 32. In addition, the rotation of the shaft 7 and the support member 85 is also stopped. Thereby, the diopter measurement unit 50 is stopped at the retreat position. That is, the diopter measurement unit 50 is stopped at the retreat position by the block 32 and the block holder 39. Thus, the movement of the diopter measurement unit 50 to the retreat position is completed.

In the present embodiment, the movement of the diopter measurement unit 50 to the retracted position is described by way of example only, but the present invention is not limited to this. For example, a detection unit that detects the retracted state may be provided, and based on the detection result, the movement of the eye diopter measurement unit 50 to the retracted position may be stopped. In this case, for example, the shielding portion is provided on the support member 38, and the detector is provided on the base 31. For example, when the diopter measurement unit 50 is located at the retracted position, and when the shielding portion provided to the support member 38 is detected by the detector, the movement of the diopter measurement unit 50 to the retracted position may be stopped.

< first operation unit and second operation unit >

The first operation unit 8 and the second operation unit 9 will be described below. For example, the first operation unit 8 is an up-down movement switch (movement switch of the diopter measurement unit 50). The second operation unit 9 is, for example, an up-down movement switch (movement switch of the diopter measurement unit 50). That is, in the present embodiment, the first operation unit 8 and the second operation unit 9 are operation units for performing the same operation. For example, the eye refractive power measurement unit 50 can be moved between the inspection position in front of the eye of the subject and the retracted position by operating the first operation unit 8 or the second operation unit 9.

For example, the first operation portion 8 is disposed on the left side surface of the housing 2. For example, the second operation portion 9 is disposed on the right side surface of the housing 2. For example, the first operation portion and the second operation portion are disposed above the left and right side surfaces. In the present embodiment, for example, the first operation unit and the second operation unit are disposed at left-right symmetrical positions with respect to the center of the housing 2.

In the present embodiment, for example, the first operation unit 8 and the second operation unit 9 are operation units having the same shape. For example, since the first operation unit 8 and the second operation unit 9 have the same shape, when one of the first operation unit 8 and the second operation unit 9 is operated, the same operation as the other can be performed to operate the subjective refraction device 1, and therefore, the possibility of erroneous operation by the inspector can be suppressed, and the operation can be facilitated.

In the present embodiment, the first operating unit 8 and the second operating unit 9 are provided as operating units for moving the diopter measurement unit 50 between the inspection position in front of the eye to be inspected and the retracted position, but the present invention is not limited to this. For example, the configuration may be such that at least 1 or more operation units are provided as operation units for moving the eye refractive power measurement unit 50 between the inspection position and the retracted position in front of the eye to be inspected. For example, when 1 operation unit is used, the operation unit may be disposed at a position where the operation unit can be operated from the left and right sides of the subjective refraction device 1.

< projection optical System >

The projection optical system 10 will be explained below. For example, fig. 4A and 4B are views of the projection optical system 10 from the left side (arrow direction C1 in fig. 1A and 1B). Fig. 4A shows an optical configuration at the time of remote inspection. Fig. 4B shows an optical configuration at the time of proximity inspection. For example, the projection optical system 10 includes a target presenting unit, and projects a target light beam emitted from the target presenting unit toward the eye E. For example, in the present embodiment, a display (e.g., the display 11) is used as the optotype presenting part. For example, the projection optical system 10 includes a display 11, a flat mirror 12, a concave mirror 13, a distance switching unit 20, and the like.

For example, an examination optotype such as a bright multi-ring optotype or a fixation optotype is displayed on the display 11. For example, the display of the display 11 is controlled by a control unit 80 described later. For example, lcd (liquid Crystal display), organic el (electro luminescence), plasma display, and the like can be used as the display.

For example, in the remote inspection shown in fig. 4A, the screen of the display 11 is directed to the back side of the housing 2, and the target light beam is emitted in the direction of the back side. The sighting mark light beam may be emitted from the display in the horizontal direction (Z direction) or in the oblique direction (YZ direction). For example, in the proximity inspection shown in fig. 4B, the screen of the display 11 is directed upward, and the sighting mark light beam is emitted upward. The sighting mark light beam may be emitted from the display in a vertical direction (Y direction) or in an oblique direction (YZ direction). Thus, the sighting mark light beam from the display 11 is projected toward the eye E to be inspected.

For example, the plane mirror 12 reflects the sighting target beam from the display 11 and guides the sighting target beam to the concave mirror 13. The plane mirror 12 reflects the sighting target light beam from the display 11, for example, and guides the sighting target light beam to the eye E. For example, the flat mirror 12 is coated with a mirror surface only on the lower portion (the solid line portion of the flat mirror 12 in fig. 4A and 4B) and is not coated with a mirror surface on the upper portion (the dotted line portion of the flat mirror 12 in fig. 4A and 4B).

Therefore, in the present embodiment, the upper portion of the flat mirror 12 is transparent. For example, the optical distance from the display to the eye E is designed to be 40cm in the proximity inspection. However, the optical distance from the display 11 to the eye E to be inspected is not limited to 40cm in the proximity inspection, and may be different optical distances (for example, 20cm, 30cm, 50cm, 60cm, or the like). In the present embodiment, the configuration is not limited to the one using a plane mirror as long as the sighting mark light beam can be reflected. For example, any reflecting member may be used. In this case, a structure using, for example, a prism, a beam splitter, a half mirror, a total reflection mirror, or the like may be employed.

For example, the inclination angle θ 2 of the flat mirror 12 is designed to be 38 °. Of course, the inclination angle of the flat mirror 12 is not limited thereto. For example, the inclination angle of the plane mirror 12 may be any one of 30 ° to 40 °. The inclination angle of the plane mirror 12 is set to any one of 30 ° to 40 °, whereby the space of the subjective optometry apparatus can be further saved. The inclination angle of the plane mirror 12 may be an inclination angle with respect to the optical axis L4 of the sighting target beam reflected by the plane mirror 12 toward the eye to be inspected. For example, the inclination angle of the plane mirror 12 may be an angle formed by the optical axis of the sighting target beam reflected by the plane mirror 12 toward the eye to be inspected and the optical axis of the plane mirror 12 (the axis in the normal direction of the reflection surface of the reflection member).

For example, the concave mirror 13 reflects the sighting mark light beam from the display 11 toward the plane mirror 12. For example, the concave mirror 13 sets the presentation distance of the inspection optotype displayed on the display 11 to the long inspection distance. For example, the focal distance of the concave mirror 13 is designed so that the optical distance from the display 11 to the eye E becomes 5 m. Of course, the optical distance from the display 11 to the eye E is not limited to 5m, and may be a different optical distance (e.g., 3m, 4m, etc.). In the present embodiment, for example, the focal distance of the concave mirror 13 is designed to be 637.5 mm. Of course, the focal length of the concave mirror 13 is not limited thereto. In the present embodiment, the configuration using concave mirror 13 is not limited. For example, the reflecting member may reflect the sighting mark light beam. In this case, for example, an aspherical mirror, a free-form surface mirror, or the like may be used. Also, for example, a structure using a lens is possible. In this case, for example, the optical distance from the display 11 to the eye E may be designed to be 5m by projecting the sighting mark light beam from the display 11 to the eye E via the lens.

For example, in the case of the remote examination shown in fig. 4A, a sighting mark light beam emitted from the display 11 and passing through the optical member in this order of the plane mirror 12, the concave mirror 13, and the plane mirror 12 is projected onto the eye E of the examinee. That is, when the sighting mark light beam emitted from the display 11 passes through the optical axis L1 and enters the plane mirror 12, the sighting mark light beam is reflected in the direction of the optical axis L2 and directed to the concave mirror 13. Note that the incidence angle θ of the sighting mark light beam emitted from the display 11 with respect to the concave mirror 13 is designed to be 4.9 °. Of course, the incident angle is not limited to the above configuration, and may be 10 ° or less. In the present embodiment, the incident angle θ is an angle formed by the optical axis L5 of the concave mirror 13 and the optical axis L2.

For example, in the present embodiment, the distance W1+ W2 from the display 11 to the concave mirror 13 at the time of the remote inspection is designed to be 555 mm. Of course, the distance W1+ W2 from the display 11 to the concave mirror 13 is not limited to the above configuration, and may be 540mm to 570mm or less. The distance W1+ W2 from the display 11 to the concave mirror is determined from the distance W1 on the optical axis L1 until the target light beam emitted from the display 11 enters the plane mirror 12 and the distance W2 on the optical axis L2 until the target light beam reflected by the plane mirror 12 enters the concave mirror 13. That is, the distance adding the distance W1 to the distance W2 is the distance W1+ W2 from the display 11 to the concave mirror 13.

For example, when the sighting mark light beam enters the concave mirror 13, the sighting mark light beam is reflected along the optical axis L3 and faces the plane mirror 12. When the sighting mark light beam enters the plane mirror 12, the sighting mark light beam is reflected along the direction of the optical axis L4 and is projected to the eye E of the examinee. For example, in the case of the proximity test shown in fig. 4B, the sighting mark light beam emitted from the display 11 and reflected by the flat mirror 12 is projected onto the eye E of the subject. That is, the sighting mark light beam emitted from the display 11 enters the plane mirror 12 through the optical axis L3, is reflected in the direction of the optical axis L4, and is projected onto the eye E of the subject. For example, the projection optical system 10 emits the sighting mark light beam from the inside to the outside of the housing 2.

For example, the distance switching unit 20 changes the position of the display 11 during the distance examination and the near examination. For example, the distance switching unit 20 includes a holding unit 21, a gear 22, a motor 23, and the like. For example, the holding portion 21 holds the display 11. For example, the gear 22 has a worm part 24 and a worm part 25. For example, the worm portion 24 and the worm wheel portion 25 are formed of gears that mesh with each other. For example, the motor 23 is coupled to the worm 24, and the holding portion 21 is coupled to the worm wheel 25. For example, the worm 24 is rotated by driving the motor 23, and the worm 25 is rotated in the arrow direction in accordance with the rotation. This enables the display 11 to be moved integrally with the holding portion 21, and the presentation position of the inspection optotype displayed on the screen of the display 11 to be switched between the time of the distance inspection and the time of the near inspection. The gear 22 and the motor 23 are disposed on the side wall of the housing 2 at positions that do not interfere with the sighting mark light flux from the display 11 toward the eye E.

In the present embodiment, the configuration in which the optical axis L3 and the optical axis L4 of the projection optical system 10 are coaxial at the time of the distance examination and the time of the near examination is exemplified, but the present invention is not limited to this. For example, in the present embodiment, the eye E may be configured to guide the sighting mark light beam to the eye E, and the sighting mark light beam may pass through different optical paths at the time of the distance examination and the near examination.

< Observation means >

The observation unit 40 is explained below. Fig. 5 is a diagram for explaining the observation unit. For example, the observation unit 40 of the present embodiment is used to observe the positional relationship between the eye diopter measurement unit 50 and the eye to be inspected E, which will be described later, through the presentation window 3. For example, in the present embodiment, the observation unit 40 includes an observation window 41, a shielding portion 42, a cover 43, a detector (detection unit) 45, and the like. The observation unit 40 may be configured to include at least an observation window 41.

For example, the observation window 41 is used to observe the positional relationship between the eye diopter measurement unit 50 and the eye E from the outside of the housing 2 through the presentation window 3. For example, the observation window 41 of the present embodiment is disposed at a position where the pupil position of the eye to be inspected E can be confirmed from the examiner's eye OE. For example, when the examiner observes the observation window 41, the flat mirror 12 is formed to be transparent in a region through which the examiner's line of sight passes in order to avoid the line of sight of the examiner being blocked by the flat mirror 12. For example, the shielding portion 42 suppresses entry of the sighting mark light beam from the projection optical system 10 to the observation window 41. For example, in the present embodiment, the shielding portion 42 is disposed at the boundary between the transparent portion and the mirror portion of the plane mirror 12.

For example, the cover 43 is fixed to the housing 2 by a hinge 44 and is openable and closable with respect to the observation window 41. For example, the cover 43 can be opened and closed by an inspector pushing and pulling a handle, not shown.

For example, the detector 45 detects opening and closing of the cover 43 in the observation unit 40. For example, the detector 45 is configured using an optical sensor such as a photo interrupter. That is, the detector 45 of the present embodiment has a convex portion 45a where the light emitting element and the light receiving element face each other, and a convex portion 46 provided in the cover 43 is fitted into a concave portion 45 b. For example, when light from the light emitting element is blocked due to the protrusion 46 being fitted in the recess 45b, the detector 45 detects that the cover is closed. Further, for example, when the light from the light emitting element is received by the light receiving element with the protrusion 46 separated from the recess 45b, the detector 45 detects that the cover is in the open state.

< Ocular diopter measurement Unit >

The diopter measuring unit 50 will be described below. For example, the diopter measurement unit 50 is close to the housing 2 (see fig. 4A and 4B). For example, in the present embodiment, the distance W (see fig. 4A and 4B) from the inspection window 53 of the diopter measurement unit 50 to the presentation window 3 disposed in the housing 2 is designed to be 66 mm. For example, in the present embodiment, the angle of field from the inspection window 53 is designed to be 40 °. For example, the optometry window 53 has an optometry window 53a disposed on the casing 2 side and an optometry window 53b disposed on the eye E side. In the present embodiment, the distance W from the optometry window 53a disposed on the housing 2 side to the presentation window 3 disposed on the housing 2 is designed to be 66 mm. The distance W from the inspection window 53a to the presentation window 3 is not limited to this embodiment. For example, the distance W may be 180mm or less.

For example, when the distance W is shorter than the length of the head of the examiner, the examiner cannot insert the head between the diopter measurement unit 50 and the housing 2, and thus it is difficult to observe the positional relationship between the diopter measurement unit 50 and the eye to be inspected E. Therefore, when the distance W is shorter than the head length of the examiner, the observation window 41 can be effectively used.

For example, fig. 6 is a diagram showing the eye diopter measurement unit 50. For example, the diopter measurement unit 50 includes a forehead rest 51, a pair of left and right lens chamber units 52, an inspection window 53, a drive unit 54, a drive unit 55, a movement unit 56, a cornea position sighting optical system 60, and the like. For example, the forehead rest 51 is brought into contact with the forehead of the subject to keep the distance between the eye E and the diopter measurement unit 50 constant.

For example, the lens chamber unit 52 is disposed in the inspection window 53 by switching optical elements. For example, a lens disc 57 is provided inside the lens chamber unit 52. The lens disk 57 has a plurality of optical elements (spherical lens, cylindrical lens, dispersion prism, etc.) arranged on the same circumference. For example, the lens disk 57 is controlled to rotate by the drive unit 54 (actuator or the like). Thus, the inspector arranges a desired optical element in the inspection window 53. For example, the optical element disposed in the inspection window 53 is controlled to rotate by a driving unit 55 (a motor, a solenoid, or the like). Thus, the optical element is disposed in the inspection window 53 at a rotation angle desired by the inspector.

For example, lens disk 57 may be comprised of 1 lens disk or a plurality of lens disks. For example, when a plurality of lens discs (lens disc groups) are provided, corresponding driving portions are provided for the respective lens discs. For example, each lens disk of the lens disk set is provided with an opening (or 0D lens) and a plurality of optical elements. As the types of the respective lens discs, a spherical lens disc having a plurality of spherical lenses with different powers, a cylindrical lens disc having a plurality of cylindrical lenses with different powers, and an auxiliary lens disc are represented. The lens tray of the present embodiment includes a lens for aligning marked with a cross line. For example, at least one of a red filter/green filter, a prism, a crossed cylinder, a polarizing plate, a martensitic rod lens, and an auto-crossed cylinder is disposed on the auxiliary lens disk. For details of the lens disk, please refer to japanese patent application laid-open nos. 2007 and 68574 and 2011 and 72431.

For example, the moving unit 56 adjusts the interval of the lens chamber unit 52. For example, the interval between the left and right lens chamber units is adjusted by a driving section 58 having a slide mechanism. This allows the interval of the inspection windows 53 to be changed in accordance with the interpupillary distance (PD) of the subject. Further, the moving unit 56 adjusts the convergence angle (convergence angle) of the left and right lens chamber units. For example, the convergence angle of the left and right eye diopter measurement units is adjusted by the driving unit 59 having a convergence mechanism. Please refer to japanese patent application laid-open No. 2004-329345 for a detailed structure of the mobile unit.

The diopter measurement unit 50 is not limited to the above configuration. For example, the diopter measurement unit 50 may be configured to change the optical characteristics (for example, at least one of the spherical power number, the cylindrical axis, the polarization characteristics, the aberration amount, and the like) of the sighting target light beam. For example, the optical characteristics of the sighting mark light beam can be changed by controlling the optical element. For example, a structure using a wavefront modulation element is possible.

< control section >

For example, fig. 7 is a schematic configuration diagram of a control system of the subjective refraction device 1. For example, the control unit 80 is connected to the first operation unit 8, the second operation unit 9, the display 11, the detector 45, the controller 81, the nonvolatile memory 82, the light source 91, and the like. For example, the motor 30 provided in the moving unit 6, the motor 23 provided in the distance switching unit 20, and the driving units (driving units 54, 55, 58, and 59) provided in the respective members of the diopter measurement unit 50 are connected to the control unit 80.

For example, the control unit 80 includes a CPU (processor), a RAM, a ROM, and the like. For example, the CPU controls each component of the subjective optometry apparatus 1. For example, the RAM temporarily stores various information. For example, various programs for controlling the operation of the subjective refraction device 1, inspection target data, and the like are stored in the ROM. The control unit 80 may be configured by a plurality of control units (i.e., a plurality of processors).

For example, the controller 81 is used when switching the display of the display 11 of the projection optical system 10, the arrangement of the optical elements of the diopter measurement unit 50, and the like. For example, a signal input from the controller 81 is input to the control unit 80 via a cable not shown. In the present embodiment, a signal from the controller 81 may be input to the control unit 80 through wireless communication such as infrared rays.

For example, the nonvolatile memory 82 is a non-transitory storage medium capable of holding stored contents even when the power supply is cut off. For example, a hard disk drive, a flash ROM, a USB memory, or the like can be used as the nonvolatile memory 82. For example, a plurality of inspection optotype data (for example, optotype data having an optotype value of 0.1 to 2.0) such as a long-range optotype are stored in the nonvolatile memory 82.

For example, in the present embodiment, the control unit 80 switches the measurement mode of the subjective refraction device 1 based on the detection result of the detector 45. For example, in the present embodiment, the control unit 80 automatically switches the measurement mode in conjunction with the opening and closing of the cover 43. For example, when the detector 45 detects that the cover 43 is opened, the control unit 80 sets the measurement mode to the second mode for checking the pupil position of the subject. For example, when the detector 45 detects that the cover 43 is closed, the control unit 80 sets the measurement mode to the first mode for performing the subjective examination of the subject. In the present embodiment, the measurement mode is automatically switched in conjunction with the opening and closing of the cover 43, but the present invention is not limited to this. For example, the measurement mode can be switched manually by the examiner. In this case, a signal for switching the measurement mode may be input to the control unit 80 by using a controller 81 described later.

< inspection action >

The inspection operation of the subjective refraction device 1 having the above-described configuration will be described. For example, the examiner operates the first operation unit 8 to lower the diopter measurement unit 50 to the examination position shown in fig. 8. For example, when the first operation portion 8 is operated, the control portion 80 drives the motor 30. For example, the diopter measurement unit 50 is lowered toward the inspection position by driving the motor 30. For example, when the diopter measurement unit 50 is moved to the inspection position by driving the motor 30, the block 32 is brought into contact with the block holder 36 and the lowering of the diopter measurement unit 50 is stopped. Then, the movement of the support member 85 is started in association with the stop of the diopter measurement unit 50, and when the support member 85 moves to a predetermined position, the driving of the motor 30 is stopped. As a result, as shown in fig. 8, the movement of the diopter measurement unit 50 to the inspection position is completed, and the subjective inspection can be performed by the diopter measurement unit 50.

As described above, the diopter measurement unit 50 moves to the inspection position. Next, for example, before the examiner performs the subjective examination, the PD of the examinee is measured in advance, and the measured PD is input to the subjective optometry apparatus 1. Thus, the control unit 80 drives the driving unit 58 to adjust the interval between the left and right lens chamber units 52, and changes the interval between the inspection windows 53 in accordance with the PD of the eye to be inspected. For example, the control unit 80 adjusts the distance in the horizontal direction (X direction) between the optical axes of the left and right inspection windows 53 to be the same as PD. In the present embodiment, the same includes substantially the same.

Next, the examiner instructs the examinee to observe the inspection window 53. Here, for example, the examiner opens the cover 43 to confirm the interpupillary distance PD of the eye E to be examined. At this time, when the detector 45 detects that the cover 43 is opened, the control unit 80 switches the measurement mode to the second mode for checking the pupil position of the subject.

For example, the inspector operates the controller 81 to adjust the interval between the left and right lens chamber units 52 as necessary. Next, the examiner performs alignment of the eye E with respect to the eye diopter measuring unit 50 using the cornea position sighting optical system 60 in order to confirm the cornea apex position of the eye E.

For example, when the alignment of the eye E to be inspected with respect to the eye diopter measurement unit 50 is completed, the inspector closes the cover 43 and starts the subjective examination. At this time, the controller 80 detects that the cover 43 is closed by the detector 45, and switches the measurement mode to the first mode for performing the subjective examination of the subject.

For example, when a remote check is performed (see fig. 4A), the control unit 80 turns on the display 11. For example, the sighting mark light beam is emitted from the display 11 held by the holding unit 21 toward the plane mirror 12. The sighting target light beam is reflected by the plane mirror 12 and the concave mirror 13, and is guided to the eye E again through the plane mirror 12. For example, when a proximity test is performed (see fig. 4B), the display 11 moves together with the holding portion 21 and is disposed at a close distance (e.g., a distance of 40 cm) from the eye E. The sighting mark light beam is emitted from the display 11 toward the plane mirror 12. The sighting mark light beam is reflected by the plane mirror 12 and guided to the eye E.

For example, during the distance examination and the near examination, the examiner operates the controller 81 to display the examination icon on the screen of the display 11. The control unit 80 calls out the corresponding inspection target data from the nonvolatile memory 82 based on an input signal from the controller 81, and controls the display of the display 11. The examination optotype displayed on the display 11 is presented to the eye E of the examinee via the examination window 53 and the presentation window 3 of the diopter measurement unit 50.

For example, the examiner inquires of the examinee about the recognition of the examination target while switching the examination target. For example, in the case where the answer of the examinee is correct, the optotype is switched to the visual force value of the upper level 1. For example, if the answer of the subject is wrong, the test chart is switched to the optotype having the lower level 1 visual force value. By performing the visual function examination in this manner, the examiner can acquire the optical characteristics (for example, the spherical power S, the cylindrical power C, the astigmatism axis angle a, and the like) of the eye E to be examined.

For example, when the distance examination or the near examination is completed, the examiner performs a preset frame examination on the eye E to be examined. For example, the examiner operates the up switch 8a of the first operation unit 8 to raise the diopter measurement unit 50 to the retracted position shown in fig. 1A and 1B. For example, when the upper switch 8a of the first operation unit 8 is operated, the control unit 80 drives the motor 30. For example, when the diopter measurement unit 50 is moved to the retracted position, the control unit 80 rotates the motor 30 in a rotation direction opposite to the rotation direction of the motor 30 when the diopter measurement unit 50 is moved to the inspection position.

For example, when the movement of the diopter measurement unit 50 to the retreat position is completed, the examiner wears a preset frame (test frame or test frame) to the examinee, replaces lenses of various powers (test lenses), and confirms the wearing feeling.

As described above, for example, in the present embodiment, the subjective refraction device is configured such that, when the eye diopter measurement unit is used, the first distance from the presentation window to the eye diopter measurement unit in the optical path of the target light beam projected from the target presentation unit to the eye to be inspected is 180mm or less (66 mm in the present embodiment). Thus, the space of the subjective refraction device can be saved, and the subjective refraction device in which the eye diopter measurement unit and the housing are integrated can perform a high-precision subjective examination.

In the present embodiment, for example, the target presenting unit and the optical member may be arranged such that the second distance from the target presenting unit to the optical member in the optical path is any one of 540mm to 570mm (555 mm in the present embodiment) in order to enable the optical characteristics of the eye to be measured with the first distance. Thus, the space of the subjective optometry apparatus can be saved, and the subjective examination with high precision can be performed.

In this embodiment, for example, the optical member may be a concave mirror, and the incidence angle of the sighting mark light beam with respect to the concave mirror is 10 ° or less (4.9 ° in this embodiment). This can suppress deformation and aberration of the concave mirror, and can perform a high-precision subjective examination.

In addition, for example, in the present embodiment, in order to enable the optical characteristics of the eye to be inspected to be measured with the first distance consciously, the presentation window may have a dimension in the horizontal direction of 130mm or more and a dimension in the vertical direction of 50mm or more (in the present embodiment, the dimension in the horizontal direction is 184mm, and the dimension in the vertical direction is 99 mm). With this configuration, in the integrated subjective refraction device, when the examinee observes the visual target presenting part through the refraction window, the narrowing of the angle of view when observing from the refraction window can be suppressed, and the subjective examination can be performed satisfactorily. Further, when the optotype presenting part is observed through the optometry window, the frame of the presentation window can be seen, and thus the function of the adjustment force of the eye to be inspected can be suppressed, and a high-precision subjective inspection can be performed.

In addition, for example, in the present embodiment, in order to enable the optical characteristics of the eye to be inspected to be measured with the first distance consciously, the presentation window may have a horizontal dimension of 270mm or less and a vertical dimension of 190mm or less (in the present embodiment, the horizontal dimension is 184mm and the vertical dimension is 99 mm). With this configuration, in the integrated subjective refraction device, when the visual target presenting part is observed through the refraction window, it is possible to suppress a case where the disturbance light reflected by the presentation window is guided to the eye to be inspected and a case where the visual target is difficult to be checked because the disturbance light enters the inside of the housing, and it is possible to perform a high-precision subjective examination.

For example, in the present embodiment, the subjective refraction device may include: a moving unit having a driving unit for moving the position of the eye diopter measurement unit, wherein the eye diopter measurement unit can be moved between an inspection position in front of the eye to be inspected and a retreat position by the driving of the driving unit; and a control unit for controlling the moving unit by driving the driving unit to move the eye diopter measuring unit between the inspection position in front of the eye to be inspected and the retreat position. For example, the movement of the eye diopter measurement unit can be easily performed by automatically moving the eye diopter measurement unit between the inspection position in front of the eye of the subject and the retreat position.

For example, in the present embodiment, the moving means may be configured to move the diopter measurement means to the retreat position above the inspection position. Thus, since the diopter measurement means can be retracted without crossing the face of the subject, it is possible to provide a subjective refraction device capable of further suppressing excessive contact.

In the present embodiment, a fixing portion for fixing the display 11 when the subjective refraction device 1 is moved may be provided. For example, the fixing portion may be operated by an inspector from the outside of the housing 2. For example, the examiner operates the fixing unit to fix the display 11. For example, screws or the like can be used as the fixing portions. For example, a screw receiving place may be provided on the display 11, and the screw may be rotated by the inspector, whereby the screw is embedded into the screw receiving place of the display, restricting the movement of the display 11. This can restrict movement of the display 11 that can be moved during the distance inspection and the proximity inspection, and can suppress a failure. That is, since the display 11 of the subjective refraction device 1 of the present embodiment has a movable structure, when the subjective refraction device 1 is moved, it is possible to suppress the display 11 from moving and coming into contact with another member, thereby causing a failure.

In the present embodiment, a handle for gripping the subjective refraction device 1 when the subjective refraction device 1 is moved may be provided. For example, the handle may be provided at the bottom of the subjective refraction device 1. For example, the handles are provided on the left and right sides of the housing 2 so as to be movable by the left and right hands of the examiner. For example, a mounting portion may be coupled to the handle portion to dispose the controller 81.

In this embodiment, a moth-eye film may be provided on the screen of the display 11. This can suppress reflection on the screen of the display 11, and can perform high-precision inspection. The configuration provided on the screen of the display 11 is not limited to the moth-eye film. For example, a film or a coating layer capable of suppressing reflection at the screen of the display 11 may be provided.

Description of the reference numerals

1 subjective optometry device

2 casing

3 presenting window

4 holding unit

5 connecting part

6 Mobile unit

7 shaft

8 first operation part

9 second operation part

10 projection optical system

11 display

30 drive part

31 base station

32 blocks

35 holding arm

36 block support

38 support member

39 block support

40 Observation cell

50-eye diopter measurement unit

53 inspection window

60 cornea position aiming optical system

80 control part

85 support member

90 put on the elbow.