JP6967918B2 - Camera device - Google Patents

Description

The present invention relates to a camera device.

An in-vehicle camera is known to have a structure in which a lens and a shield case are integrally attached to a camera module, and the camera module is incorporated into the case. In order to reduce the cost as compared with this structure, it is also known that the in-vehicle camera has a structure in which a lens is fixed to a case and a camera module and a shield case are incorporated in the case. In the latter structure, a frame-shaped gap is formed between the case and the camera module, and the frame-shaped shield case is inserted into the frame-shaped gap (see, for example, Patent Document 1).

Japanese Unexamined Patent Publication No. 2013-115701

By the way, in the case of the configuration described in Patent Document 1, since the electromagnetic wave is shielded only by the frame-shaped shield case, the shielding effect may be insufficient when a strong electromagnetic wave is applied from the lens side.
Therefore, an object of the present invention is to obtain a high shielding effect against electromagnetic waves from the lens side with a structure in which the lens is fixed to the case.

In order to achieve the above object, the present invention presents a substrate on which electronic components such as an image pickup element are mounted and a frame-shaped shield installed so as to surround the substrate inside the back surface of a case in which a lens is fixed to the front surface. In a camera device into which a case is inserted, a separate electromagnetic shield is arranged between the lens and the shield case, and the electromagnetic shield is electrically connected to the shield case.

In the above configuration, the electromagnetic shield has a shield main body portion that surrounds an opening through which light passing from the lens toward the substrate passes, and an extension portion that extends from the shield main body portion and contacts the shield case. You may.

Further, in the above configuration, the case has a tubular lens barrel portion that holds the lens, and the electromagnetic shield may be attached to the surface of the lens barrel portion on the substrate side.

Further, in the above configuration, the electromagnetic shield may be formed of a flexible material having a metal layer and an adhesive layer, and may be attached to the surface of the lens barrel portion on the substrate side by the adhesive layer.

Further, in the above configuration, an optical filter may be provided between the lens and the substrate, and the electromagnetic shield may also serve as a pressing member for pressing the optical filter to the lens side or the substrate side.

The present invention is under a configuration in which a substrate on which electronic components such as an image pickup element are mounted and a frame-shaped shield case installed so as to surround the substrate are inserted inside the back surface of a case in which a lens is fixed to the front surface. A separate electromagnetic shield is arranged between the lens and the shield case, and the electromagnetic shield is electrically connected to the shield case. As a result, it is possible to obtain a high shielding effect against electromagnetic waves from the lens side with a structure in which the lens is fixed to the case.

FIG. 1 is a diagram showing a camera device according to the first embodiment of the present invention. It is the figure which showed the camera module and the shield case together with the peripheral composition. It is sectional drawing of the camera device. It is the figure which showed the electromagnetic shield of a camera device together with the peripheral composition. It is the figure which showed the electromagnetic shield from diagonally rear with the peripheral composition. It is a figure which showed the electromagnetic shield together with a camera module, a shield case and the like. (A) shows the electromagnetic shield of the camera device according to the second embodiment together with the front case, and (B) shows the electromagnetic shield together with the shield case.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
(First Embodiment)
FIG. 1 is a diagram showing a camera device according to the first embodiment of the present invention. The reference numeral FR shown in FIG. 1 and each figure described later indicates the front side of the camera device 10, the reference numeral UP indicates the upper side of the camera device 10, and the reference numeral LH indicates the left side toward the camera device 10.
The camera device 10 is an in-vehicle camera mounted on a vehicle. The case 11 (also referred to as a housing) of the camera device 10 can be divided into a front case 12 and a rear case 13. The camera device 10 has a structure in which a lens 14 is fixed to the front surface of a front case 12, and a camera module 16 and a shield case 17 are incorporated inside the back surface of the case 12.

The front case 12 has a substantially rectangular parallelepiped box shape that opens rearward, and is made of a resin material. Further, the rear case 13 has a substantially rectangular parallelepiped box shape that opens forward, and is made of a resin material. The front case 12 and the rear case 13 are integrated by fitting to form a substantially rectangular parallelepiped case 11. A cable 18 electrically connected to the camera module 16 extends from the rear case 13.

FIG. 2 is a diagram showing the camera module 16 and the shield case 17 together with the peripheral configuration.
The camera module 16 has a substrate 22 on which electronic components such as an image sensor 21 are mounted. The optical filter 24 is arranged on the front surface of the substrate 22 (corresponding to the lens 14 side) via the spacer 23. The optical filter 24 is arranged on the lens 14 side of the image pickup device 21. The image pickup device 21 is a CMOS image pickup device, and the optical filter 24 is an IR cut filter. However, the image pickup device 21 and the optical filter 24 are not limited to the above configuration.

The shield case 17 is formed in a rectangular frame shape that surrounds the top, bottom, left, and right of the substrate 22 of the camera module 16, and is formed of a conductive metal plate such as phosphor bronze. The shield case 17 is arranged in a gap between the camera module 16 and the inner peripheral surface of the case 11 (see FIG. 1).
By surrounding the top, bottom, left, and right of the substrate 22, the shield case 17 functions as an electromagnetic shield that shields electromagnetic waves emitted from the camera module 16 (particularly the substrate 22) to the surroundings and electromagnetic waves from the surroundings to the camera module 16. The shield case 17 integrally has a plurality of bent pieces 17S that abut on the back surface of the substrate 22, and at least one of these bent pieces 17S abuts on the back surface of the substrate 22 or the like, and the substrate 22 and the shield case 17 Conduction connection and positioning are performed.

FIG. 3 is a cross-sectional view of the camera device 10.
The front case 12 integrally includes a front plate portion 12F, which is a portion having a front surface, and an outer peripheral cylinder portion 12G extending rearward from the outer peripheral edge of the front plate portion 12F to form an outer peripheral portion of the front case 12. A holding hole 12K that penetrates in the front-rear direction and holds the lens 14 is formed in the front plate portion 12F, and a cylindrical lens barrel portion 12T that extends rearward along the outer circumference of the holding hole 12K is integrated. Is formed in. According to this configuration, as compared with the case where the lens barrel portion 12T is formed as a separate body, the number of parts is reduced, the workability of assembly is improved, and it is advantageous in cost reduction.

The lens 14 is composed of a plurality of lens elements arranged in the front-rear direction. In FIG. 3, reference numeral L1 indicates the central axis of the lens 14, that is, the optical axis. The configuration of the lens 14 is not limited to the configuration shown in FIG. 3, and a known configuration can be widely applied.

As shown in FIG. 4, a separate electromagnetic shield 30 is arranged between the lens barrel portion 12T in the front case 12 and the rear case 13 including the shield case 17 and the camera module 16. The electromagnetic shield 30 has a shield main body 31 attached to the back surface of the lens barrel 12T (corresponding to the surface on the substrate 22 side) and a pair of extending portions 32 extending from the shield main body 31 and coming into contact with the shield case 17. And have one.

In the present embodiment, aluminum tape, which is a flexible material in which an adhesive layer is provided on the back surface of a metal layer (also referred to as aluminum foil) made of an aluminum alloy, is used for the electromagnetic shield 30.
FIG. 5 is a diagram showing the electromagnetic shield 30 from diagonally rearward together with the peripheral configuration.
The shield main body portion 31 is formed in a shape that surrounds the central hole 12A (corresponding to the opening through which the light passing from the lens 14 toward the substrate 22 passes) on the back surface of the lens barrel portion 12T, and more specifically, the shield main body portion 31 is formed in the central hole 12A. It is formed in a circular shape (also referred to as a donut shape) having a communicating opening 31A. The shield main body 31 is attached to the back surface of the lens barrel 12T by an adhesive layer. As a result, the shield main body 31 can be easily attached to the lens barrel 12T.

FIG. 6 is a diagram showing the electromagnetic shield 30 together with the camera module 16 and the shield case 17.
The pair of extending portions 32 are a first folded portion 33 folded back from the shield main body 31 to the front side (lens 14 side), and a radial outside of the shield main body 1 from the front end of the first folded portion 33 (the present embodiment). Then, the second folded portion 34 folded upward or downward) and the third folded portion 35 folded backward from the radial outer end portion of the second folded portion 34 are integrally provided.

As shown in FIG. 3, the first folded portion 33 is attached to the outer peripheral surface of the lens barrel portion 12T, the second folded portion 34 is attached to the back surface of the front plate portion 12F, and the third folded portion 35 is attached. , Attached to the inner peripheral surface of the outer peripheral cylinder portion 12G of the front case 12. As described above, since the first to third folded portions 33 to 35 are made of aluminum tape, the work of attaching the front case 12 to each inner peripheral surface is easy.

As shown in FIG. 6, the third folded-back portion 35 overlaps with a part of the shield case 17 inserted in the front case 12 in the vertical direction so as to come into contact with each other and electrically conduct. As a result, the electromagnetic wave radiated toward the electromagnetic shield 30 can be released to the outside by using the shield case 17.
Here, as shown in FIGS. 3 and 6, the shield main body 31 is arranged in a slight gap between the lens barrel 12T and the optical filter 24. In this case, the shield main body 31 may come into contact with the optical filter 24.

Further, when the metal layer of the shield main body 31 is thickened to improve the rigidity, the optical filter 24 may be pressed toward the substrate 22 by the shield main body 31. In this case, the optical filter 24 is sandwiched between the shield main body 31 and the substrate 22, and the positional deviation of the optical filter 24 can be efficiently suppressed.
Although the case where aluminum tape is used for the electromagnetic shield 30 has been described, the present invention is not limited to this configuration, and various conductive metal plates and the like can be widely applied.

As described above, the camera device 10 of the present embodiment surrounds the substrate 22 on which electronic components such as the image pickup element 21 are mounted and the substrate 22 inside the back surface of the case 11 in which the lens 14 is fixed to the front surface. It has a configuration in which a frame-shaped shield case 17 installed so as to be inserted is inserted. Under this configuration, a separate electromagnetic shield 30 is arranged between the lens 14 and the shield case 17, and the electromagnetic shield 30 is electrically connected to the shield case 17. According to this configuration, even if the lens 14 is fixed to the case 12 of the camera device 10, it is possible to obtain a high shielding effect against electromagnetic waves from the lens 14 side.

Further, the electromagnetic shield 30 extends from the shield main body 31 and the shield case 31 that surrounds the opening (corresponding to the central hole 12A of the lens barrel 12T) through which the light passing from the lens 14 to the substrate 22 passes. It has an extension 32 that comes into contact with 17. According to this configuration, the electromagnetic wave from the lens side to the camera body can be effectively shielded by the shield body portion.

Further, since the case 12 has a tubular lens barrel portion 12T for holding the lens 14, and the electromagnetic shield 30 is attached to the back surface of the lens barrel portion 12T (corresponding to the surface on the substrate 22 side), the electromagnetic shield 30 Can be easily attached.
Moreover, the electromagnetic shield 30 is formed of aluminum tape, which is a flexible material having a metal layer and an adhesive layer, and is attached to the back surface of the lens barrel portion 12T by the adhesive layer, so that the electromagnetic shield 30 can be attached more easily. Can be done.

(Second embodiment)
FIG. 7 is a diagram showing the electromagnetic shield 130 of the camera device 10 according to the second embodiment together with the peripheral configuration. More specifically, FIG. 7 (A) shows the electromagnetic shield 130 together with the front case 12, and FIG. 7 (B) shows the electromagnetic shield 130 together with the shield case 17.
In the camera device 10 according to the second embodiment, as shown in FIG. 7A, the optical filter 24 is arranged on the inner peripheral side of the lens barrel portion 12T and on the back surface of the lens 14. The electromagnetic shield 130 attached to the back surface of the lens barrel portion 12T also serves as a pressing member that presses the optical filter 24 toward the lens 14. As a result, the optical filter 24 is fixed.

The electromagnetic shield 130 has a shield main body 31 attached to the back surface (corresponding to the surface on the substrate 22 side) of the lens barrel 12T, and a single extension 132 that extends from the shield main body 31 and comes into contact with the shield case 17. (See FIG. 7 (B)). The electromagnetic shield 130 is made of a metal plate having rigidity and conductivity such as a stainless steel plate, and has sufficient strength to hold the optical filter 24 toward the lens 14.

Further, the thickness of the shield main body 31 is adjusted to the size of the gap between the optical filter 24 arranged on the back surface of the lens barrel 12T and the substrate 22 (including the image sensor 21). The misalignment of the optical filter 24 can be efficiently suppressed. In the first embodiment, the spacer 23 is used for arranging the optical filter 24, but in the second embodiment, the spacer 23 is omitted. The spacer 23 may be used in an appropriate place.

As described above, also in the present embodiment, a separate electromagnetic shield 30 is arranged between the lens 14 and the shield case 17, and the electromagnetic shield 30 is electrically connected to the shield case 17. Various effects similar to those of the first embodiment can be obtained.
Moreover, since the electromagnetic shield 130 also serves as a pressing member that presses the optical filter 24 toward the lens 14, it is easy to reduce the number of parts required for fixing the optical filter 24, and it is easy to attach the optical filter 24.

Each of the above embodiments is merely an example of an embodiment of the present invention, and can be arbitrarily modified and applied without departing from the spirit of the present invention.
For example, the shape and material of the parts constituting the camera device 10 can be appropriately changed. Further, in each of the above embodiments, the case where the present invention is applied to the camera device 10 used as an in-vehicle camera has been described, but the present invention is not limited to this, and the present invention is applied to the camera device 10 other than the in-vehicle use. May be good.

10 Camera device 11 Case 12 Front case 12T Lens barrel 13 Rear case 14 Lens 16 Camera module 17 Shield case 21 Imaging element 22 Board 24 Optical filter 30, 130 Electromagnetic shield 31 Shield body 31A Opening 32, 132 Extension

Claims (5)

In a camera device in which a substrate on which electronic components such as an image sensor are mounted and a frame-shaped shield case installed so as to surround the substrate are inserted inside the back of a case in which a lens is fixed to the front.
A camera device characterized in that a separate electromagnetic shield is arranged between the lens and the shield case, and the electromagnetic shield is electrically connected to the shield case. The electromagnetic shield is characterized by having a shield main body portion that surrounds an opening through which light passing from the lens toward the substrate passes, and an extension portion that extends from the shield main body portion and comes into contact with the shield case. The camera device according to claim 1. The case has a tubular lens barrel portion that holds the lens.
The camera device according to claim 1, wherein the electromagnetic shield is attached to a surface of the lens barrel portion on the substrate side. The camera according to claim 3 , wherein the electromagnetic shield is formed of a flexible material having a metal layer and an adhesive layer, and is attached to the surface of the lens barrel portion on the substrate side by the adhesive layer. Device. An optical filter is provided between the lens and the substrate.
The camera device according to any one of claims 1 to 3, wherein the electromagnetic shield also serves as a pressing member that presses the optical filter on the lens side or the substrate side.

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