阅读说明：本技术 一种视野计的投影成像装置及视野计系统 (Projection imaging device of perimeter and perimeter system ) 是由 王梓 吕国强 冯奇斌 于 2021-08-26 设计创作，主要内容包括：本发明提出一种视野计的投影成像装置及视野计系统,视野计的投影成像装置包括：投影仪,电性连接计算机。准直透镜,用于准直投影仪投射的光线。以及半球面散射屏,位于准直透镜的出光侧,半球面散射屏对准直透镜出射的光线进行散射成像,且准直透镜的中心轴线与半球面散射屏的中心轴线处于同一直线。本发明提出的视野计的投影成像装置结构简单,具有生产和应用价值。(The invention provides a projection imaging device of a perimeter and a perimeter system, wherein the projection imaging device of the perimeter comprises: the projector is electrically connected with the computer. And the collimating lens is used for collimating the light projected by the projector. And the hemispherical scattering screen is positioned on the light-emitting side of the collimating lens and is used for scattering and imaging the light emitted by the collimating lens, and the central axis of the collimating lens and the central axis of the hemispherical scattering screen are positioned in the same straight line. The projection imaging device of the perimeter provided by the invention has a simple structure and has production and application values.)

1. A perimeter projection imaging apparatus, comprising:

the projector is electrically connected with the computer;

a collimating lens for collimating the light projected by the projector; and

and the hemispherical scattering screen is positioned on the light-emitting side of the collimating lens and is used for scattering and imaging the light emitted by the collimating lens, and the central axis of the collimating lens and the central axis of the hemispherical scattering screen are positioned in the same straight line.

2. The perimeter projection imaging apparatus of claim 1, wherein: the projector is arranged on the light incident side of the collimating lens.

3. The perimeter projection imaging apparatus of claim 2, wherein: the central line of the projector is coincident with the central line of the collimating lens.

4. The perimeter projection imaging apparatus of claim 1, wherein: the distance between the projector and the collimating lens is equal to the focal length of the collimating lens.

5. The perimeter projection imaging apparatus of claim 1, wherein: the diameter of the collimating lens is twice of the curvature radius of the hemispherical scattering screen.

6. The perimeter projection imaging apparatus of claim 1, wherein: the projection imaging device of the perimeter also comprises an ocular, and the ocular is arranged on one side of the hemispherical scattering screen, which is far away from the collimating lens.

7. The perimeter projection imaging apparatus of claim 6, wherein: the center line of the eyepiece coincides with the center line of the hemispherical scattering screen.

8. The perimeter projection imaging apparatus of claim 6, wherein: the distance between the hemispherical scattering screen and the ocular is equal to the curvature radius of the hemispherical scattering screen.

9. The perimeter projection imaging apparatus of claim 8, wherein: the eyepiece will the image amplification on the hemispherical scattering screen is the hemisphere virtual image, just the hemisphere virtual image is located collimating lens's income light side.

10. A perimeter system, comprising: the projection imaging apparatus according to claim 1.

Technical Field

The invention relates to the field of projection imaging, in particular to a projection imaging device of a perimeter and a perimeter system.

Background

The currently used perimeter is to project a cursor onto a screen by means of projection, fix the gaze position of the subject, and determine the visual field of the subject by changing the projection position of the cursor on the hemispherical screen.

However, the above-mentioned perimeter has problems in use, such as the projection optical path needs a combined action of mechanical scanning and a zoom system to control the projection position of the cursor, the radius of the hemispherical screen is too large, the system volume is increased, and the cost is too high. Therefore, it is necessary to provide a perimeter projection device to solve the above problems.

Disclosure of Invention

In view of the above-mentioned drawbacks, the present invention provides a projection imaging apparatus of a perimeter and a perimeter system, which are configured to form a hemispherical virtual image by arranging a projector, a collimating lens, a hemispherical diffuser screen, and other components and using an eyepiece to enlarge and image the hemispherical virtual image, so as to solve the problems of complicated structure, high cost, poor portability, and the like of a spherical screen projection perimeter.

To achieve the above and other objects, the present invention provides a projection imaging apparatus of a perimeter, comprising:

the projector is electrically connected with the computer;

a collimating lens for collimating the light projected by the projector; and

and the hemispherical scattering screen is positioned on the light-emitting side of the collimating lens and is used for scattering and imaging the light emitted by the collimating lens, and the central axis of the collimating lens and the central axis of the hemispherical scattering screen are positioned in the same straight line.

In one embodiment of the invention, the projector is disposed at a light entrance side of the collimating lens.

In one embodiment of the invention, the centre line of the projector coincides with the centre line of the collimator lens.

In one embodiment of the invention, the distance between the projector and the collimating lens is equal to the focal length of the collimating lens.

In one embodiment of the invention, the diameter of the collimating lens is twice the radius of curvature of the hemispherical diffuser screen.

In one embodiment of the invention, the projection imaging device of the perimeter of view further comprises an eyepiece, and the eyepiece is arranged on one side of the hemispherical diffusion screen away from the collimating lens.

In one embodiment of the invention, the centre line of the eyepiece and the centre line of the hemispherical diffuser screen coincide.

In one embodiment of the invention, the distance between the hemispherical diffuser and the eyepiece is equal to the radius of curvature of the hemispherical diffuser.

In one embodiment of the invention, the eyepiece magnifies the image on the hemispherical diffuser screen into a hemispherical virtual image, and the hemispherical virtual image is positioned on the light incident side of the collimating lens.

The invention provides a perimeter system, which comprises the projection imaging device.

In summary, the invention provides a projection imaging device of a perimeter and a perimeter system, which adopt a virtual imaging mode to replace a hemispherical screen of the perimeter with a hemispherical virtual image, thereby simplifying the structure of the system. In addition, the projector, such as a laser scanning projector, is adopted for projecting images, so that the depth of field is larger, an optical focusing system and mechanical scanning are not needed, and the structure is further simplified.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

FIG. 1 is a schematic view of a projection imaging apparatus of a perimeter in one embodiment;

FIG. 2 is a schematic diagram of distortion of a projection imaging apparatus of a perimeter before image correction in one embodiment;

FIG. 3 is a schematic diagram of a laser scanning projector in an embodiment of a projection imaging apparatus of a perimeter;

fig. 4 is a schematic structural diagram of a control system of a laser scanning projector in an embodiment of a projection imaging apparatus of a perimeter.

Description of reference numerals:

1, a computer;

2, a projector;

21 a control system;

211 a drive circuit;

212 a control component;

22 a laser emitting device;

23 galvanometer systems;

231 a galvanometer motor;

232 double-vibrating mirror group;

3 a collimating lens;

4, hemispherical scattering screen;

5, an ocular lens;

6 hemispherical virtual images.

Detailed Description

The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention.

It should be noted that the drawings provided in the present embodiment are only for illustrating the basic idea of the present invention, and the components related to the present invention are only shown in the drawings rather than drawn according to the number, shape and size of the components in actual implementation, and the type, quantity and proportion of the components in actual implementation may be changed freely, and the layout of the components may be more complicated.

The embodiment provides a projection imaging device of a perimeter, which is simple and compact in structure and high in portability by arranging a projector, a collimating lens, a hemispherical diffuser screen and other components and utilizing an eyepiece to enlarge and image so as to form a hemispherical virtual image.

Referring to fig. 1, in the present embodiment, the projection imaging apparatus of the perimeter may include a computer 1, and the computer 1 corrects an image to be projected. The computer 1 is electrically connected with the projector 2. Referring to fig. 2, before the computer 1 is used to correct the image, the incident light beam forms a projection inclined plane with an inclination angle θ on the hemispherical diffuser 4. Where H is the height of the incident beam relative to the projected centerline and d is the width of the incident beam. The incident light beam forms an inclination angle theta on the hemispherical diffuser 4, and the inclination angle theta can satisfy the following expression: theta ═ sin^-1(H/r), wherein r is the curvature radius of the hemispherical scattering screen 4, and the length of the inclined plane is d/cos theta. At the central axis of the hemispherical diffuser 4, the tilt angle θ is smallest, and increases as the distance between the projection beam and the central axis increases. The increase in the tilt angle θ causes the projected image to be stretched, resulting in distortion in the image. The computer 1 corrects the image to be projected by first dividing the image to be projected into n annular regions of equal width d, according to a reverse compensation factor cos sin^-1(nd/r)]Correcting image distortion of each annular region, wherein the width of the nth annular region is based on inverse compensation factor cos sin^-1(nd/r)]Reverse shrinkage correction is performed, and the corrected image is output to the projector 2. Fig. 1 is a schematic structural diagram of a projection imaging apparatus of a perimeter in an embodiment. Fig. 2 is a schematic diagram of distortion principle of a projection imaging device of a perimeter before image correction in an embodiment.

Referring to fig. 1, in the present embodiment, the projection imaging apparatus of the perimeter may further include a projector 2, and in the present embodiment, the projector 2 may be a laser scanning projector. The laser beam is deflected by the high-speed galvanometer to scan an image, so that the use of a lens is avoided, and the lens has larger depth of field. The projector 2 emits light into the collimating lens 3 to realize parallel projection of the light. The projection field angle of the projector 2 is 2 α, and the distance between the projector 2 and the collimator lens 3 may be set to L. The diameter of the collimator lens 3 is D, wherein the focal length of the collimator lens 3 is equal to the distance between the projector 2 and the collimator lens 3. In order to further improve the utilization rate of the projection light, the diameter D of the collimating lens 3 and the distance L between the projector 2 and the collimating lens 3 may be set to satisfy the relation: d ═ 2L tan α. In this embodiment, the projector 2 is, for example, a laser scanning projector, and has a large depth of field.

Referring to fig. 1 and 3, in the present embodiment, the projector 2 may be a laser scanning projector, and the laser scanning projector projects a laser beam, such as a cone, toward the collimating lens. In other embodiments of the present invention, the laser beam may also be regarded as a circular truncated cone, and in this case, the collimating lens 3 still converts the laser beam from the projector 2 into parallel rays to be emitted. The laser scanning projector may include a control system 21, a laser emitting device 22, and a galvanometer system 23. The laser emitting device 22 generates laser light while emitting a laser beam outward. The galvanometer system 23 may include a galvanometer motor 231 and a dual-galvanometer group 232, the galvanometer motor 231 may be an actuator, and the galvanometer with a reflective mirror may be fixed on a shaft of the galvanometer motor 231. The dual-mirror group 232 may include a reflective mirror fixed on a shaft of the mirror motor 231, the shaft of the mirror motor 231 is X, Y shafts, and the mirrors on the X-axis and the Y-axis respectively scan. Fig. 3 is a schematic structural diagram of a laser scanning projector in an embodiment of a projection imaging device of a perimeter.

Referring to fig. 4, in the present embodiment, the control system 21 may include a driving circuit 211 and a control unit 212, the driving circuit 211 receives a control command from the computer 1 to the galvanometer motor 231 and performs a corresponding command operation, and the control unit 212 is configured to control a deflection angle of the galvanometer and finally project an image onto the collimating lens 3 at a projection angle of 2 α. Fig. 4 is a schematic structural diagram of a control system of a laser scanning projector in an embodiment of a projection imaging apparatus of a perimeter.

Referring to fig. 1, in the present embodiment, the projector 2 is disposed on the light incident side of the collimating lens 3, and a center line of the projector 2 coincides with a center line of the collimating lens 3. The laser scanning projector may project light to the collimator lens 3 through an opening angle of 2 α. The laser scanning projector performs selection of a projection curve for the projected image and creates a group. Through the connection of the laser scanning projector and the computer 1, the laser scanning projector emits laser beams, and the image to be projected is compared with the image corrected by the computer 1, so that the distortion of the projected image is further reduced.

Referring to fig. 1, in the present embodiment, the collimating lens 3 is configured to convert a laser beam emitted by the laser scanning projector into parallel light, and the projector 2 is disposed on a light incident side of the collimating lens 3. The laser scanning projector emits a high-power laser beam which impinges on the collimator lens 3. The collimating lens 3 straightens the laser beam into a parallel laser beam, and the straightened laser beam irradiates the hemispherical scattering screen 4. The distance between the projector 2 and the collimator lens 3 and the length of the focal length of the collimator lens 3 may be equal. In this embodiment, the collimating lens 3 may be a single-piece lens, such as a plano-convex or a biconvex lens. The diameter of the collimator lens 3 is D, wherein the focal length of the collimator lens 3 is equal to the distance between the projector 2 and the collimator lens 3. In order to further improve the utilization rate of the projection light, the diameter D of the collimating lens 3 and the distance L between the projector 2 and the collimating lens 3 may be set to satisfy the relation: d ═ 2L tan α. In other embodiments of the present invention, an achromatic doublet lens may also be used as the collimating lens 3, and at the same time, the relative aperture is also appropriately reduced to meet the imaging requirement.

Referring to fig. 1, in the embodiment, the projection imaging apparatus of the perimeter may further include a hemispherical diffuser 4, and in an embodiment of the present invention, the hemispherical diffuser 4 may be hemispherical. In other embodiments of the present invention, the hemispherical diffuser screen 4 may also be configured in other shapes, such as a quarter sphere, etc., according to the imaging requirement. When the ocular lens does not contain the curvelet aberration, the distance between the hemispherical scattering screen 4 and the ocular lens is s₁. S in order to make the virtual image of the hemispherical diffuser 4 still hemispherical₁It needs to be equal to the radius of curvature of the hemispherical diffuser screen 4. The hemispherical scattering screen 4 is used for flattening the collimated light by the collimating lens 3The line beam is subjected to scatter imaging. The image corrected by the collimating lens 3 of the projector 2 is projected on the hemispherical scattering screen 4, so that uniform and distortion-free imaging of light rays is realized. In order to make the projection light completely projected on the hemispherical surface, the diameter of the collimating lens 3 is D, and the distance s between the hemispherical scattering screen 4 and the ocular lens₁May be set so as to satisfy the following relation: d2 s₁. Namely, the diameter of the collimating lens 3 is twice of the curvature radius of the hemispherical diffuser 4.

Referring to FIG. 1, in other embodiments of the present application, when the eyepiece lens includes a field curvature wave aberration W (ρ)_i) When this is the case, the diffusion screen 4 may be provided in other shapes. At this time, in order to form a virtual hemispherical image, the shape coordinates of the diffusion screen 4 may beWhere ρ is₀Is the object height of a point on the diffuser screen 4, z₀Is the object distance of the point, p_iIs the image height of the point corresponding to the image point, z_iThe image distance of the image point is f, and the focal length of the ocular lens is f. And is provided withWherein s is₂Is the radius of curvature of the virtual hemispherical image 6.

Referring to fig. 1, in the present embodiment, the projection imaging device of the perimeter further includes an eyepiece 5, and the eyepiece 5 is disposed on a side of the hemispherical diffuser 4 away from the collimating lens 3. The center line of the eyepiece 5 is coincident with the center line of the hemispherical scattering screen 4. The distance between the hemispherical scattering screen 4 and the ocular lens 5 is equal to the curvature radius of the hemispherical scattering screen 4. The eyepiece 5 enlarges the image on the hemispherical scattering screen 4 into a hemispherical virtual image 6, and the hemispherical virtual image 6 is positioned on the light incidence side of the collimating lens 3.

Referring to fig. 1, in the present embodiment, the eyepiece 6 may be a refractive lens, and the focal length of the eyepiece 5 is f, so as to display the image on the hemispherical diffuser 4 as an enlarged hemispherical virtual image 6. Between the virtual hemispherical image 6 and the eyepiece 5Distance s₂The following formula is satisfied: s₂＝fs₁/(f-s₁) Wherein s is₁Is the distance between the hemispherical diffuser 4 and the ocular 6, and f is the focal length of the ocular 5. The distance between the virtual hemispherical image 6 and the eyepiece 5 is equal to its radius of curvature. F, s is the focal length of the eyepiece 5₁<f. The hemispherical scattering screen 4 forms a virtual image through the ocular 5, which is a hemispherical virtual image 6. The distance between the hemispherical virtual image 6 and the eyepiece 5 satisfies the following formula: s₂＝fs₁/(f-s₁) While the virtual hemispherical image 6 has a radius of curvature s₂。s₂The range of (b) is, for example, 30 to 50 cm. When the computer works, the computer 1 transmits the corrected image to the projector 2 for projection, the projector 2 projects the image to the collimating lens 3, and the collimating lens 3 projects the image on the hemispherical scattering screen 4 in a collimated light mode without distortion. The image on the hemispherical scattering screen 4 is converted into the hemispherical virtual image 6 through the ocular lens 5. The hemispherical virtual image 6 can realize hemispherical screen imaging of the perimeter, the structure is simple and compact, and the use space of the equipment is saved.

Referring to fig. 1-3, in the present embodiment, the computer 1 is used to correct a projection image and output the projection image to the projector 2, and the projector 2 cooperates with the collimating lens 3 to project the corrected image in the form of collimated light. The hemispherical diffusion screen 4 is used for diffusion imaging of the projection light. The ocular lens 5 is used for amplifying the image on the hemispherical diffusion screen 4 into the hemispherical virtual image 6 so as to replace the hemispherical screen of the traditional perimeter. The central axis of eyepiece 5 with collimating lens 3 and the central axis of hemispherical scattering screen 4 is in the collinear, just hemispherical virtual image 6 with the center of curvature of hemispherical scattering screen 4 is the same. The perimeter projection imaging device provided by the embodiment can realize virtual view imaging, and has the advantages of simple and compact structure, low cost and high portability. In another embodiment of the invention, the imaging quality can be improved in different occasions according to requirements, so that the imaging equipment is simplified, and the working efficiency is improved.

Referring to fig. 1-4, the present embodiment provides a perimeter system, which includes a computer 1, a projector 2, a collimating lens 3, a hemispherical diffuser 4, and an eyepiece 5. The computer 1 is electrically connected with the projector 2, and the computer 1 corrects the image to be projected. The corrected image is transmitted to the projector 2, and the projector 2 may be a laser scanning projector. The laser scanning projector may include a control system 21, a laser emitting device 22, and a galvanometer system 23. The control system 21 may include a driving circuit 211 and a control component 212, the driving circuit 211 receives a control command from the computer 1 to the galvanometer motor 231 and performs a corresponding command operation, and the control component 212 is configured to control a deflection angle of the galvanometer and finally project an image onto the collimating lens 3 at a projection angle of 2 α. The laser emitting device 22 generates laser light while emitting a laser beam outward. The galvanometer system 23 may include a galvanometer motor 231 and a dual-galvanometer group 232. The galvanometer motor 231 may be used as an actuator, and the dual-galvanometer group 232 performs image scanning respectively. The collimating lens 3 is used for converting the laser beam emitted by the laser scanning projector into parallel light, and the collimated parallel light is emitted to the hemispherical scattering screen 4. The hemispherical scattering screen 4 performs scattering imaging on the parallel light beams collimated by the collimating lens 3, and the eyepiece 5 magnifies the image on the hemispherical scattering screen 4 into a hemispherical virtual image 6, so as to realize virtual magnified imaging of the perimeter system.

In summary, the present embodiment discloses a projection imaging apparatus of a perimeter and a perimeter system, which use a computer to correct a projection image and output the corrected image to a projector. The projector projects the corrected image onto a collimating lens. The light rays are emitted out through the collimating lens and are scattered and imaged on the hemispherical scattering screen. The eyepiece enlarges the image on the hemispherical scattering screen into a hemispherical virtual image to replace a hemispherical screen of a traditional perimeter. The invention can be applied to a virtual perimeter, avoids the use of a large-size hemispherical screen, and has simple and compact structure and high portability.

The above description is only a preferred embodiment of the present application and a description of the applied technical principle, and it should be understood by those skilled in the art that the scope of the present invention related to the present application is not limited to the technical solution of the specific combination of the above technical features, and also covers other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the inventive concept, for example, the technical solutions formed by mutually replacing the above features with (but not limited to) technical features having similar functions disclosed in the present application.

Other technical features than those described in the specification are known to those skilled in the art, and are not described herein in detail in order to highlight the innovative features of the present invention.