JP2017199988A - Shield case fixing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an imaging apparatus which enables the optimal layout of a power system substrate for downsizing without transmitting noise influence to an imaging system circuit.SOLUTION: An imaging apparatus comprises: a front plate (24) formed by a conductive material; a body housing (25) which holds the front plate (24); a power supply circuit board (32); an upper surface shield case (30) formed by a conductive material; and a lower surface shield case (31) formed by a conductive material. The power supply circuit board (32), the upper surface shield case (30), and the lower surface shield case (31) are fixed and electrically connected with the body housing (25) in at least one portion.SELECTED DRAWING: Figure 2(a)

Description

  The present invention relates to a shield case fixing method, and more particularly, to a shield case fixing structure that is excellent in stabilization of shield characteristics and shock resistance while reducing the influence of noise on an image sensor.

  Conventionally, there has been a problem that electromagnetic wave noise and current noise generated from a power supply system circuit board are transmitted to an imaging system circuit and a noise component is added to photographing data.

  The prior example shown in Patent Document 1 discloses a substrate arrangement configuration in which an external memory substrate is arranged between a power supply system circuit board and an imaging system circuit board, thereby shielding noise of the power supply system circuit by the external memory substrate. Has been. Moreover, in the prior example shown in Patent Document 2, an imaging system is mounted on a support housing (hereinafter referred to as a front plate) of an imaging device and an imaging system circuit board that are usually made of a conductive material in order to shield noise jumping into the imaging device. The shield case of the circuit board is electrically connected. Thus, an example in which the GND of the imaging system circuit is strengthened and noise countermeasures are taken is also disclosed.

JP 2009-175292 A JP 2005-65014 A

  However, in the technique shown in Patent Document 1, since the arrangement of each substrate is limited, the external memory is arranged in a place where it is difficult for the user to use when dealing with products having different specifications. In addition, there is a problem in that the optimum layout of each substrate cannot be flexibly handled, and an extra fixing case and dead space are generated, resulting in an increase in the size of the imaging apparatus.

  In addition, in a single-lens reflex camera, since a user often places a battery in a part that supports the camera (hereinafter referred to as a grip), it is essential to place the power supply system board in the vicinity (on the grip or on the back). Come. In the case of the conventional camera size, there was no problem because the power supply board could be fastened to the main body housing that does not perform GND connection with the front plate.

  However, under the influence of “miniaturization”, which has been increasingly demanded in recent years, when the power supply system board is moved toward the center of the camera, the power supply board has to be fixed to the front plate. If this is the case, when the technique shown in Patent Document 2 is applied, noise generated from the power supply system circuit is transmitted to the front plate, and the noise influence is strongly exerted on the imaging system circuit that is GND-connected to the front plate. The problem of giving up occurs.

  The present invention has been made in view of the above circumstances, and does not transmit noise effects to the imaging system circuit even when the power system board is fixed to the front plate, and is a suitable power system board for miniaturization. An object of the present invention is to provide an imaging apparatus capable of the layout of

In order to achieve the above object, an imaging apparatus according to the present invention includes:
A front plate made of a conductive material, a main body housing holding the front plate,
A power circuit board, a top shield case made of a conductive material,
In the imaging device including the lower shield case made of a conductive material, the power supply circuit board, the upper shield case, and the lower shield case are fixed and electrically connected to the main body housing at least in one place. It is characterized by.

  According to the present invention, it is possible to provide an image pickup apparatus that does not transmit an influence of noise generated from the power supply system circuit board to the image pickup system circuit and can perform an optimum layout of the power supply system board for miniaturization.

(A) is an external front perspective view of an imaging apparatus according to the present embodiment, and (b) is an external rear perspective view of the imaging apparatus according to the present embodiment. Side perspective view showing configuration of main body housing Disassembled front perspective view of the internal configuration of the imaging device body Disassembled rear perspective view of the internal configuration of the imaging device body FIG. 2 is a block diagram illustrating a main electrical configuration of the imaging apparatus according to the present embodiment. (A) is a front perspective view of the power supply circuit unit, (b) an exploded front perspective view of the power supply circuit unit, (c) is an exploded bottom perspective view of the power supply circuit unit, and (d) is an AA of FIG. Cross section view

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In addition, the same code | symbol is attached | subjected to the common part in a figure.

  First, the main body configuration of the imaging apparatus according to the present embodiment will be described with reference to FIG.

  1A is an external front perspective view of the imaging apparatus, and FIG. 1B is an external rear perspective view of the imaging apparatus.

  In FIG. 1A, reference numeral 1 denotes an image pickup apparatus body, 2 denotes a photographic lens, 2a denotes a photographic optical axis, 3 denotes a grip portion, and 4 denotes a release button that is a SW that outputs a start signal for starting a shooting operation. . In FIG. 1B, 5 indicates a main SW for starting the camera, and 6 indicates a display unit. The grip portion 3 is a portion that holds the imaging apparatus main body 1 when the user takes a picture, and has a convex shape so that the user can easily grip it. Details of each will be described later together with a block diagram (FIG. 3) showing a main electrical configuration of the imaging apparatus.

  Next, an internal configuration of the imaging apparatus main body according to the present embodiment will be described with reference to FIG.

  2A is a side perspective view showing the configuration of the main body housing, FIG. 2B is an exploded front perspective view of the internal configuration of the imaging apparatus main body, and FIG. 2C is an exploded back view of the internal configuration of the imaging apparatus main body. A perspective view is shown.

  In FIG. 2A, 24 indicates a front plate, and 25 indicates a main body housing. 2 (b) and 2 (c), 21 is an imaging unit, 21a, 21b and 21c are screws for fastening the imaging unit 21 to the front plate 24, 22 is a power supply circuit unit, and 22a and 22b are power supply circuits. A screw 23 for fastening the part indicates a battery. The front plate 24 is made of a conductive material and holds the imaging unit 21 and the photographing lens 2. The main body housing 25 is a housing that holds the entire imaging apparatus main body 1, and fastens and holds the front plate 24 with screws (not shown). The imaging unit 21 is fastened to the front plate 24 with screws (21a, 21b, 21c).

  At this time, the ground (hereinafter referred to as GND) of the imaging unit 21 and the GND of the front plate 24 are electrically connected. The GND of the front plate 24 is not connected to the GND that is the base of the imaging apparatus main body 1, and is completed only by the imaging unit 21 and the front plate 24. The power supply circuit unit 22 is fastened to the front plate 24 by screws 22a and fastened to the main body housing 25 by 22b. The battery 23 is a rechargeable lithium ion battery, and is inserted into a battery housing part inside the grip part 3 and electrically connected to the power supply circuit part 22 to supply power. In the present embodiment, the battery 23 uses a rechargeable lithium ion battery, but is not limited to this. Details of each will be described later together with a block diagram (FIG. 3) showing a main electrical configuration of the imaging apparatus.

  Next, the main electrical configuration of the imaging apparatus will be described with reference to FIG.

  FIG. 3 is a block diagram showing a main electrical configuration of the imaging apparatus according to the present embodiment. In FIG. 3, 20 is a control part, 21 is an imaging part, 26 is a mount contact part.

  The control unit 20 including a microcomputer built in the imaging apparatus main body 1 controls operation and storage of the imaging apparatus, and processes information from each element, instructs each element, and stores each information. The control unit 20 has a built-in battery, and always starts even when the main SW is in an OFF state, and is in a standby state. Further, the release button 4, the main SW 5, the display unit 6, the imaging unit 21, the power supply circuit unit 22, the battery 23, and the mount contact 26 are electrically connected to the control unit 20. The control unit 20 supplies power from the battery 23 to the power supply circuit unit 22 by the ON signal of the main SW 5, and the power supply circuit unit supplies power to each element under the control of the control unit 20.

  The control unit 20 and the photographic lens 2 communicate via the mount contact unit 26. Under the control of the photographing lens 2, the photographing lens 2 is adjusted so that the photographing optical axis 2 a is focused on the imaging unit 21. The imaging unit 21 includes an imaging element that performs photoelectric conversion on a subject image. In the present embodiment, a CMOS sensor is used for the imaging unit 21, but there are various other types such as a CCD type and a CID type, and any type of imaging device may be adopted. When the control unit 20 detects the ON signal of the release button 4, the control unit 20 causes the imaging unit 21 to capture subject information, and the subject information from the imaging unit 21 is displayed on the display unit 6 as image data via the control unit 20. The

  Next, the detailed configuration of the power supply circuit unit 22 will be described with reference to FIG.

  4A is a front perspective view of the power circuit section, FIG. 4B is an exploded front perspective view of the power circuit section, FIG. 4C is an exploded bottom perspective view of the power circuit section, and FIG. It is an arrow line view of the AA cross section in Fig.4 (a).

  In FIG. 4, 30 is a top shield case, 30a is a first fixed claw, 30b is a first reinforcing shape, 31 is a bottom shield case, 31a is a second fixing claw, 31b is a second reinforcing shape, 32 is A power circuit board, 32a is a top shield clip, 32b is a bottom shield clip, and 32c is a fastening portion of the power circuit board 32 by screws 22b.

  The upper shield case 30 and the lower shield case 31 are made of a conductive material, and in the present embodiment, are made of a metal having a spring property. The upper shield case 30 and the lower shield case 31 are arranged so as to cover components mounted on the upper and lower surfaces on the power circuit board 32, respectively. The upper shield case 30 and the lower shield case 31 are electrically connected to the GND of the imaging apparatus main body 1, and electromagnetic field noise generated from the mounted components on the power supply circuit board is generated by the upper shield case 30 and the lower shield case 31. It has a function of blocking discharge to the outer space.

  The power supply circuit board 32 is a printed wiring board on which a power supply circuit is wired, and mounting components (not shown) are mounted on the front and back sides. A power supply circuit board 32 is mounted with a top shield clip 32a and a bottom shield clip 32b electrically connected to GND in the circuit board. The top shield clip 32a and the bottom shield clip 32b are respectively connected to the top shield case 30 and the bottom shield clip 32b. While holding the lower shield case 31, it is electrically connected to GND.

  Although the power circuit board 32 is covered with a thin film made of a non-conductive material, the GND wiring in the board is exposed at the fastening portion 32c by the screw 22b, and the top shield case 30 and the power supply are exposed by the screw 22b. The circuit board 32 and the lower shield case 31 are electrically connected to the GND of the main body casing 25 by fastening the main body casing 25 together. Although the power supply circuit portion 22 is fixed to the front plate 24 at the fastening portion by screws 22a, the surface of the power supply circuit board 32 is not exposed to copper foil, and the upper shield case 30 and the lower shield case 31 are also fastened together. Therefore, the power circuit board 32, the upper shield case 30, and the lower shield case 31 are not electrically connected to the front plate 24 by GND.

  As a result, it is possible to prevent GND fluctuations that occur when power is driven by the power supply circuit unit 22 from being transmitted as noise to the imaging unit 21 via the front plate 24, and therefore, the captured image is caused by noise. The occurrence of image abnormality can be suppressed.

  The upper shield case 30 has a first fixed claw 30a, and the lower shield case 31 has a second fixed claw 31a. The first fixed claw 30a and the second fixed claw 31a are formed at two locations. The upper surface shield case 30 and the lower surface shield case 31 are elastically held while being pulled in each other. This prevents the upper shield case 30 and the lower shield case 31 from being detached or dropped from the upper shield clip 32a and the lower shield clip 32b when vibration or impact is applied without being fastened by the screw 22a. it can.

  Further, the upper shield case 30 and the lower shield case 31 are respectively formed with a first reinforcing shape 30b and a second reinforcing shape 31b, and the first reinforcing shape 30b is in the vicinity of the first fixing claw 30a and the second reinforcing shape 30b. One fixed claw 30a is formed so as to connect to each other, and the second reinforcing shape 31b is formed in the vicinity of the second fixed claw 31a and so as to connect the second fixed claw 31a to each other. Thereby, it is possible to further suppress the upper shield case 30 and the lower shield case 31 from being deformed by vibration or impact, and the first fixed claws 30a and the second fixed claws 31a from being detached or dropped.

  The top shield clip 32a is disposed between the fastening portion by the screw 22b and the first fixing claw 30a. Similarly, the bottom shield clip 32b is between the fastening portion by the screw 22b and the second fixing claw 31a. Has been placed. Accordingly, it is possible to prevent the upper shield case 30 and the lower shield case 31 from being detached or dropped from the upper shield clip 32a and the lower shield clip 32b, respectively, when vibration or impact is applied. By adopting the above series of configurations, it is possible to prevent the upper shield case 30 and the lower shield case 31 from coming off and falling off when a vibration or impact is applied without fastening them to the front plate 24 with screws.

  Note that the fixed claw shape, the reinforcing shape, and the respective layouts are examples of the embodiment, and are not limited to this as long as the shapes and layout have the same effects.

  By adopting the above-described series of main body configurations, it is possible to provide an imaging apparatus capable of laying out an optimal power supply system board for miniaturization without transmitting noise generated from the power supply system circuit board to the imaging system circuit. .

1 imaging device body, 2 photographing lens, 2a photographing optical axis, 3 grip portion,
4 Release button, 5 Main SW, 6 Display section, 20 Control section, 21 Imaging section,
21a, 21b, 21c screw, 22 power supply circuit section, 22a, 22b screw,
23 battery, 24 front plate, 25 body housing, 26 mount contact portion,
30 upper shield case, 30a first fixed claw, 30b first reinforcing shape,
31 bottom shield case, 31a second fixed claw, 31b second reinforcing shape,
32 power circuit board, 32a top shield clip,
32b Bottom shield clip, 32c fixed part

Claims (4)

A front plate (24) made of a conductive material;
A body housing (25) for holding the front plate (24);
A power circuit board (32), a top shield case (30) made of a conductive material,
In the imaging device including the lower shield case (31) made of a conductive material, the power supply circuit board (32), the upper shield case (30), and the lower shield case (31) are at least in one place. An imaging device characterized by being fixed and electrically connected to the body (25). The upper shield case (30) has a first fixing claw (30a),
The lower shield case (31) has a second fixing claw (30b),
The upper shield case (30) and the lower shield case (31) are elastically fixed by hooking and pulling the first fixing claw (30a) and the second fixing claw (30b) in at least one place. The imaging apparatus according to claim 1, wherein: The power circuit board (32) is mounted with an upper shield clip (32a) and a lower shield clip (32b),
The upper surface shield case (30) is held and electrically connected by the upper surface shield clip (32a) between a fixed portion of the main body housing (25) and a fixed portion of the first fixing claw (30a). And
The lower shield case (31) is held and electrically connected by the lower shield clip (32b) between a fixed position with the main body housing (25) and a fixed position with the second fixed claw (30b). The imaging apparatus according to claim 1, wherein: The upper shield case (30) has a first reinforcing shape (30b),
The first reinforcing shape (30b) is disposed in the vicinity of the first fixed claw (30a),
The lower shield case (31) has a second reinforcing shape (31b),
The imaging device according to claim 1, wherein the second reinforcing shape (31b) is disposed in the vicinity of the second fixed claw (30b).