Waterproof structure for camera, waterproof lens unit, and camera module
阅读说明:本技术 照相机防水构造、防水透镜单元及照相机组件 (Waterproof structure for camera, waterproof lens unit, and camera module ) 是由 富永修一 于 2019-02-08 设计创作,主要内容包括:通过在防水透镜单元(20)的基端部的端面(31)与照相机本体(10)的安装面(13)之间以夹持的方式设置防水壁(60),利用该防水壁(60)将照相机本体(10)的前表面与比其靠前方的空间分隔。(A waterproof wall (60) is provided between an end surface (31) of a base end portion of a waterproof lens unit (20) and a mounting surface (13) of a camera body (10) in a sandwiched manner, and the waterproof wall (60) separates a front surface of the camera body (10) from a space forward of the front surface.)
1. A waterproof structure for a camera, applied to a camera module, the camera module comprising:
a camera body having an imaging element built therein and having a mounting portion opened at a front surface, the mounting portion having an opening peripheral surface as a mounting surface; and
a waterproof lens unit including a mounted portion extending in an axial direction from an end surface of a base end portion, the mounted portion being mounted on the mounting portion to be fixed to a front surface of the camera body,
it is characterized in that the preparation method is characterized in that,
the waterproof lens unit is provided with a waterproof wall between an end surface of a base end portion thereof and a mounting surface of the camera body in a sandwiched manner, and the waterproof wall separates a front surface of the camera body from a space ahead of the front surface.
2. The waterproof structure for a camera according to claim 1,
the waterproof structure of the camera comprises a camera shell covering the periphery of the camera body, and the front wall of the camera shell forms the waterproof wall.
3. The waterproof structure for a camera according to claim 1 or 2,
an elastic annular waterproof seal is disposed between an end surface of a base end portion of the waterproof lens unit and a surface of the waterproof wall and around the attached portion, and the waterproof seal is pressed by the waterproof lens unit and the waterproof wall.
4. A waterproof lens unit includes a fixed-side cylinder and a movable-side lens barrel in which a plurality of lenses are housed, a mounted portion extending in an axial direction from an end surface of a base end portion of the fixed-side cylinder, the mounted portion being fixed to a front surface of a camera body by being mounted to a mounting portion opened to the front surface of the camera body, and a focus being adjusted to a target position to be photographed by moving the movable-side lens barrel in the axial direction with respect to the fixed-side cylinder,
it is characterized in that the preparation method is characterized in that,
in a state where an end surface of a base end portion of the fixed-side cylinder is positioned on an opening peripheral surface of the mounting portion forming a mounting surface in the camera body,
the movable-side lens barrel is further capable of approaching toward an image pickup device incorporated in the camera body from a moving position of the movable-side lens barrel with respect to the fixed-side cylinder when a target position to be photographed is set to infinity and a focal point is brought into focus at the target position.
5. The waterproof lens unit according to claim 4,
the waterproof lens unit is used for the waterproof structure of the camera according to any one of the above claims 1 to 3,
a proximal end portion of the fixed-side cylinder forms a proximal end portion of the waterproof lens unit,
in a state where the waterproof wall is removed and an end surface of a base end portion of the fixed-side cylinder is positioned on an opening peripheral surface of the mounting portion forming a mounting surface in the camera body,
the movable-side lens barrel is capable of further approaching a distance equal to or greater than the thickness of the waterproof wall toward the image pickup device incorporated in the camera body from a moving position of the movable-side lens barrel with respect to the fixed-side cylinder when a target position to be photographed is set to infinity and a focal point is brought into focus at the target position.
6. The waterproof lens unit according to claim 5,
the attached portion constitutes an attachment structure in which a male screw is formed on an outer peripheral surface and the male screw is screwed into a female screw formed in the camera body to attach the attached portion.
7. The waterproof lens unit according to claim 6,
in a state where a waterproof wall is interposed between an end surface of a base end portion of the fixed-side cylinder and a mounting surface of the camera body,
the male screw formed on the outer peripheral surface of the attached portion has a length to be screwed with the female screw formed on the camera body.
8. The waterproof lens unit according to any one of claims 5 to 7,
the waterproof lens unit is provided with a waterproof member that closes a gap between an inner peripheral surface of the fixed-side cylinder and an outer peripheral surface of the movable-side lens barrel.
9. A camera module, characterized in that,
a waterproof structure for a camera according to any one of claims 1 to 3.
Technical Field
The present invention relates to a waterproof camera structure for preventing moisture (water droplets, moisture, and the like) from entering a camera body incorporating an image pickup element.
Background
As is well known, a portable camera for general users has been widely spread, and a camera module is widely used for the following applications for companies. For example, in a production line in a factory, image recognition is performed on a part or a product flowing in the production line, control of a manufacturing apparatus and inspection of the manufactured product are performed, and a camera module is used for the image recognition of the part or the product. In addition, a camera module is also used as a security camera or a surveillance camera for security measures. In recent years, a camera module has been used as an image recognition sensor in robots for various applications in which technical development has been dramatically advanced.
As described above, camera modules widely used in various applications require a waterproof function depending on their usage environments, and various waterproof camera structures have been proposed in the past.
For example, patent document 1 discloses a waterproof camera structure in which the entire camera module (camera body and lens unit) is housed in a camera housing.
Further, patent document 2 discloses a waterproof structure in which a mounting portion of an interchangeable lens unit of the waterproof structure is similarly mounted on a camera body of the waterproof structure.
Patent document 3 discloses a waterproof structure in which a waterproof case for housing a lens unit and a joint portion of the waterproof case with respect to a camera body are provided on the premise that the lens unit having no waterproof performance is attached to the camera body having the waterproof structure.
Disclosure of Invention
Problems to be solved by the invention
As described above, various waterproof camera structures have been proposed in the past, but a waterproof camera structure suitable for a camera module on the premise that a lens unit having a waterproof structure is replaceably attached to a camera body having no waterproof performance has not been proposed yet.
In general, when the camera body does not have a waterproof performance, a waterproof case as disclosed in patent document 1 is used, and a system for housing the whole of the camera body and the lens unit (that is, the whole of the camera module) is used.
However, in the case of the method of housing the entire camera module in the waterproof housing, it is necessary to prepare waterproof housings having appropriate sizes for various replacement lens units having different sizes, and the method is not versatile.
The present invention has been made in view of the above circumstances, and an object thereof is to provide a waterproof structure for a camera having high versatility, which is applied to a camera module in which a waterproof lens unit having waterproof performance is attached to a camera body having no waterproof performance, and a waterproof lens unit used in the waterproof structure.
Means for solving the problems
In order to achieve the above object, a waterproof camera structure of the present invention is applied to a camera module including:
a camera body having an imaging element built therein and having a mounting portion opened at a front surface, the mounting portion having an opening peripheral surface as a mounting surface; and
a waterproof lens unit including a mounted portion extending in an axial direction from an end surface of a base end portion, the mounted portion being mounted on the mounting portion to be fixed to a front surface of the camera body,
it is characterized in that the preparation method is characterized in that,
the waterproof wall is provided between the end surface of the base end portion of the waterproof lens unit and the mounting surface of the camera body so as to sandwich the waterproof wall, and the front surface of the camera body is separated from the space ahead of the waterproof wall by the waterproof wall.
First, a waterproof camera structure is proposed which prevents moisture from entering the camera body from the front of the camera body. For example, when cleaning a camera module installed in a factory, the waterproof structure of the camera is preferable when dust attached to the surface of the lens is cleaned by spraying water.
That is, according to the present invention, the camera body is partitioned from the space in front thereof by the waterproof wall interposed between the end surface of the base end portion of the waterproof lens unit and the mounting surface of the camera body, so that the waterproof wall can prevent moisture from entering the camera body from the front.
A lens unit having a mounted portion with the same mounting method is mounted to a camera body having a mounting portion to which the lens unit is replaceably mounted. Therefore, since the mounting portion and the mounted portion have the same dimensional structure for the various lens units having different sizes, the structure of the sandwiching waterproof wall can be shared, and a waterproof structure for a camera having high versatility can be realized.
In addition, the waterproof structure of a camera of the present invention is premised on the use of a waterproof lens unit having waterproof performance.
The waterproof camera structure of the present invention may be configured to include a camera housing covering the periphery of the camera body, and the front wall of the camera housing may form a waterproof wall.
Thus, by covering the periphery of the camera body with the camera case, it is possible to prevent moisture from entering the camera body from the front, and also prevent moisture from entering the camera body from all directions. Further, since the camera case covers only the periphery of the camera body, the camera case does not need to be replaced even if the size of the lens unit attached to the camera body is different.
Preferably, an elastic annular waterproof seal is disposed around the attached portion between an end surface of the base end portion of the waterproof lens unit and the surface of the bulkhead, and the waterproof seal is pressed by the waterproof lens unit and the bulkhead.
This can more reliably prevent water from entering the waterproof wall through the portion where the waterproof wall is sandwiched.
Next, the waterproof lens unit of the present invention is characterized by the following configuration.
That is, the waterproof lens unit includes the following structure: the camera includes a fixed-side cylinder and a movable-side lens barrel in which a plurality of lenses are housed, wherein a mounted portion extends in an axial direction from an end surface of a base end portion of the fixed-side cylinder, the mounted portion is mounted to a mounting portion that opens on a front surface of a camera body, the mounted portion is fixed to the front surface of the camera body, and the movable-side lens barrel is moved in the axial direction with respect to the fixed-side cylinder to focus on a target position to be photographed.
In a state where the end surface of the base end portion of the fixed-side cylinder is positioned on the opening peripheral surface of the mounting portion of the camera body forming the mounting surface,
the movable lens barrel can further approach an image pickup device incorporated in the camera body from a moving position of the movable lens barrel with respect to the fixed cylinder when a target position to be photographed is set to infinity and a focal point is brought into focus at the target position.
The waterproof lens unit is configured as follows, and is suitable for the waterproof structure of the camera of the present invention.
That is, the proximal end portion of the fixed-side cylinder forms the proximal end portion of the waterproof lens unit,
in a state where the waterproof wall is removed and the end surface of the base end portion of the fixed-side cylinder is positioned on the opening peripheral surface of the mounting portion of the camera body forming the mounting surface,
the movable lens barrel can be further moved toward the image pickup device built in the camera body by a distance equal to or greater than the thickness of the waterproof wall from the moving position of the movable lens barrel with respect to the fixed cylinder when the target position to be photographed is set to infinity and the focal point is brought to the target position.
In general, a lens mounting structure of a camera module is configured such that a lens unit is mounted on a camera body in a state where an end surface of a base end portion (base end portion of a fixed-side cylinder) of the lens unit is in contact with a mounting surface of the camera body, and a flange focal length is defined in this state. The flange focal length refers to a distance from the mounting surface to the image pickup element.
In addition, in a general lens unit, when a target position to be photographed is set to infinity, the movable-side lens barrel is arranged at a moving end closest to the image pickup device, and an image at the infinity position at the moving end is formed on the image pickup device (i.e., in-focus).
The waterproof camera structure of the present invention is proposed without being limited to the common knowledge, and the waterproof wall is interposed between the end surface of the base end portion of the lens unit and the mounting surface of the camera body, whereby the end surface of the base end portion of the lens unit is disposed forward of the mounting surface of the camera body. Therefore, in the above-described general lens unit, even if the movable-side lens barrel is moved to the moving end closest to the image pickup device, the focal point does not coincide with the image at the infinite distance position.
Therefore, in the waterproof lens unit according to the present invention, the movable-side lens barrel can be configured to be closer to the image pickup device by a distance equal to or greater than the thickness of the waterproof wall than the moving end of the movable-side lens barrel (the moving end closest to the image pickup device) in the above-described general lens unit, and thereby the focus can be aligned with an image at an infinite position.
Preferably, the attached portion of the waterproof lens unit is formed as an attachment structure in which a male screw is formed on an outer peripheral surface thereof and the male screw is screwed into a female screw formed in the camera body to attach the male screw.
In such a screw-in mounting structure, the waterproof wall can be easily screwed into the female screw formed in the camera body in a state where the waterproof wall is interposed between the end surface of the base end portion of the fixed-side cylinder and the mounting surface of the camera body, simply by extending the length of the male screw formed on the outer peripheral surface of the mounted portion.
Further, for example, by closing a gap between the inner peripheral surface of the fixed-side cylinder and the outer peripheral surface of the movable-side lens barrel with a waterproof member, the lens unit can be made waterproof.
As described above, according to the waterproof camera structure of the present invention, the waterproof wall provided between the end surface of the base end portion of the waterproof lens unit and the mounting surface of the camera body in a sandwiched manner partitions the camera body from the space in front of the camera body, and therefore, the waterproof wall can prevent moisture from entering the camera body from the front.
Further, according to the waterproof lens unit of the present invention, even when applied to a waterproof camera structure in which a waterproof wall is sandwiched between an end surface of a base end portion of the lens unit and a mounting surface of a camera body, it is possible to focus an image at an infinite position.
Drawings
Fig. 1A and 1B are views showing a waterproof structure of a camera according to embodiment 1 of the present invention, in which fig. 1A is a front view, and fig. 1B is an end view showing a waterproof lens unit and a mounting portion of a camera body in a cutaway manner.
Fig. 2A and 2B are exploded views of the waterproof structure of the camera according to embodiment 1 of the present invention, in which fig. 1A is a front view, and fig. 2B is an end view in which a waterproof lens unit, a waterproof wall, and a mounting portion of a camera body are cut away.
Fig. 3A and 3B are front end views showing the waterproof lens unit according to embodiment 1 of the present invention, and each of the views shows a state in which the movable-side lens barrel is moved to a different movement position.
Fig. 4A is a front end view showing the waterproof lens unit according to embodiment 1 of the present invention in an exploded manner, fig. 4B is a front end view showing an enlarged manner of an assembly structure of the front lens group to the front lens fixing barrel, and fig. 4C is a cross-sectional view taken along line a-a in fig. 4B.
Fig. 5 is an end view for explaining the movable range setting of the movable-side lens barrel in the waterproof lens unit.
Fig. 6A and 6B are views showing a waterproof structure of a camera according to embodiment 2 of the present invention, fig. 6A being a front view, and fig. 6B being an end view showing a waterproof lens unit and a camera housing in a cutaway state.
Fig. 7 is an exploded view of the waterproof structure of the camera according to embodiment 2 of the present invention, and is an end view of the waterproof lens unit and the camera housing shown in section.
Fig. 8 is a view showing an application example of the waterproof lens unit of the present invention, and is an end view showing a waterproof lens unit and a camera body with mounting portions cut away.
Description of the reference numerals
10: camera body, 11: imaging element, 12: mounting portion, 12a, female screw portion, 13: a mounting surface,
20: a waterproof lens unit,
30: fixed-side cylinder, 30 a: internal thread, 31: end surface of base end portion of fixed-side cylindrical body, 32: mounted portion, 32 a: an external thread part,
40: movable-side lens barrel, 40 a: external thread, 40 b: rotation operation unit, 41: aperture plate, 42: front lens group, 43: front lens fixing barrel, 44: spacer, 45: fixing ring, 46: through-hole, 47: tip lens, S: space, 48: a waterproof sealing element,
50: rear lens group, 51: rear lens fixing barrel, 52: fixing ring, 55: waterproof member, 56: a nut member,
60: waterproof wall, 61: mounting hole, 62: a waterproof sealing element,
70: camera housing, 71: a front wall,
80: connector, 81: signal cable, 82: a bushing,
90: movement limiting ring
Detailed Description
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
[ embodiment 1 ]
Fig. 1A to 5C are views showing a waterproof structure and a waterproof lens unit of a camera according to embodiment 1 of the present invention.
The waterproof camera structure is suitable for a camera module constituted by the
In the present embodiment, a conventional waterproof lens unit disclosed in patent document 4 is improved, and a
That is, the
The cylindrical attached
There are various mounting methods of the camera to which the lens unit is mounted, and the mounting
The camera module to which the waterproof camera structure of the present invention is applied is not limited to the screw-in type mounting method such as C-mounting, and other mounting methods may be employed.
As shown in fig. 4A, a plurality of lenses and an
The
After the lens is mounted in the front
It is preferable that the surface of the
From the state shown in fig. 4A, the
The
As shown in fig. 4A, a
As shown in fig. 3A and 3B, a
As shown in fig. 3B and the like, a
The
Next, the waterproof structure of the camera according to the present embodiment will be described.
As shown in fig. 1A to 2B, the waterproof camera structure is constructed by providing a
As shown in fig. 2B, a circular mounting hole 61 is provided in the
The attached
The front surface of the
An elastic annular waterproof seal 62 (e.g., an O-ring, which is an annular waterproof seal) is disposed between the
The
Here, the
The
Generally, as shown in fig. 5A, the lens unit is attached to the
In addition, the general lens unit is adjusted such that, when the target position to be photographed is set to infinity based on the attached state, the movable-
In contrast, as described above, the waterproof camera structure according to the present embodiment is constructed by providing the
Therefore, the mounting
Therefore, in the above-described general lens unit, even if the movable-
Here, the
Thus, even if the
For example, as shown in fig. 5B, the base end portion of the movable
The area and shape of the
[ 2 nd embodiment ]
Fig. 6 and 7 are views showing a waterproof structure of a camera according to embodiment 2 of the present invention. In the waterproof camera structure according to embodiment 2 shown in these drawings, the same or corresponding portions as those of the waterproof camera structure according to embodiment 1 are given the same reference numerals, and detailed descriptions of the portions are omitted.
In the waterproof structure of the camera according to embodiment 2, a waterproof structure of the
The
Thus, the
Since the
As shown in fig. 7, a
The present invention is not limited to the above-described embodiments, and various modifications and applications can be made without departing from the scope of the present invention.
For example, as shown in fig. 8, the waterproof camera unit can also be used for a general camera assembly that does not use the
Here, as shown in fig. 8, the movement of the movable
The movement amount limiting ring 90 may be set to a thickness corresponding to a movement amount by which the movable
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