JPH06273832A - Printed board mounting structure for camera - Google Patents

Abstract

PURPOSE:To provide a printed board mounting structure for a camera capable of mounting electrical parts in high density by effectively using the gap space of the rear surface part of a camera main body, bent places are reduced and workability for assembling a flexible printed board in the camera main body is excellent. CONSTITUTION:The camera is equipped with a first flexible printed board 1 which is arranged along the top surface of the camera main body and on which the electrical part is mounted, a second flexible printed board 2 arranged along the bottom and rear surfaces of the camera main body and on which the electrical part is mounted and plural connecting parts 3a and 3b separately placed in the horizontal direction of the camera main body, on the camera back side of the first flexible printed board 1 and electrically connected to the second flexible printed board 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a printed circuit board mounting structure for a camera, and more particularly to a printed circuit board housed in a camera body.

[0002]

2. Description of the Related Art Conventionally, in wiring mounting of an electric circuit of a camera, a flexible printed board having flexibility has been used in order to effectively use a narrow space in the camera. However, in recent years, the scale of circuit implementation has increased with the increasing sophistication of electronics and multifunctionality, and various switches and sensors have been distributed and arranged in various places in the camera. Therefore, the wiring of the flexible printed circuit board for wiring mounting has become complicated to sew a narrow space in the camera. In addition to this, the miniaturization of cameras has progressed rapidly, and a large space within the camera has hardly been taken.
It is very difficult to design a flexible printed circuit board having a large mounting area on one plane. Therefore, the mounting of the electric components on the flexible printed circuit board is decentralized, and for the wiring between the electric components,
There was no choice but to use a large area of the flexible printed circuit board. Also, with the decentralization of electric parts, the shape of the flexible printed circuit board has become extremely complicated, and it has become difficult to develop the electric circuit of the camera on one flexible printed circuit board.

Therefore, various proposals have been made regarding the mounting structure of the printed circuit board of the camera. For example, in a printed circuit board mounting structure of a camera disclosed in Japanese Patent Laid-Open No. 62-141524, a plurality of divided bodies for mounting the flexible printed circuit board on each mounting surface portion such as a top surface, a bottom surface and a side surface of a camera body are mounted. And, in each of the divided bodies,
Each of the above-mentioned flexible printed circuit board divided bodies mounted on the corresponding surface portion of the camera body is formed by providing a projecting extension piece portion that is bent toward a common camera body surface portion on which the divided bodies are not mounted. Each of them is bent toward the common camera body surface portion, and the circuit terminals provided on the respective projecting extension pieces are connected to each other on the camera body surface portion so that the circuit of each of the flexible printed circuit board divided bodies is made into a whole series. I am trying to connect them.

According to this structure, a plurality of divided flexible printed boards mounted on a plurality of surfaces of the camera body, such as the upper surface, the bottom surface, and the side surfaces, are connected to each other by a minimum of one provided on each divided flexible printed board. The overhanging extension piece and the minimum number of folds of those pieces make it 1
Since it can be performed in the connector space and members at some places, the workability of mounting the flexible printed circuit board on the camera can be improved and the cost can be reduced.

The flexible printed circuit board of the camera disclosed in Japanese Utility Model Laid-Open No. 63-113135 is
At least a photometric sensor for measuring the brightness of the subject, a light control sensor for measuring the amount of flash light during flash photography, and a control for performing exposure control and flash photography control of the camera based on output signals from both sensors. An electric circuit element such as a circuit element is mounted on one flexible printed board, and the flexible printed board is continuously provided along the upper surface of the camera including the upper surface of the pentaprism, the side surface and the bottom surface of the mirror box, and the holding plate. At the same time, the flexible printed circuit boards are disposed so as to overlap each other.

[0006]

However, in the mounting structure of the printed circuit board of the camera disclosed in Japanese Unexamined Patent Publication No. 62-141524, the divided flexible printed circuit boards are sewn in a gap in the camera. However, there are many bending points and the mounting area of circuit components is small.
In Japanese Utility Model Laid-Open No. 63-113135, since a flexible printed circuit board has a complicated three-dimensional shape so as to be mounted in the gap of the camera, there are many bending points and it is mounted on the camera body. There is a problem that it becomes difficult. Further, in the above-mentioned prior art example, it is difficult to dispose the board on which the main electric components are mounted in the space on the back surface of the camera body.

The present invention has been made in view of the above-mentioned conventional problems, and the flexible printed circuit board having a wide mounting area is arranged by effectively utilizing the gap space on the back surface of the camera body, and the electric parts are provided. It is an object of the present invention to provide a printed circuit board mounting structure for a camera, which enables high-density mounting, has few bending points, and has good workability in assembling the flexible printed circuit board to the camera body.

[0008]

A printed circuit board mounting structure for a camera according to the present invention is arranged along the upper surface of the camera body, and has a first flexible printed circuit board on which electrical parts are mounted, and a camera body. A second flexible printed circuit board arranged along the bottom surface and the rear surface, on which electric components are mounted, and a rear side of the camera of the first flexible printed circuit board, which are provided laterally spaced from the camera body, A plurality of connecting parts electrically connected to the second flexible printed circuit board are provided.

[0009]

The present invention will be described below with reference to the illustrated embodiments. 1 and 2 show a printed circuit board mounting structure showing a first embodiment of the present invention. In the following embodiments, the case where the present invention is applied to a single-lens reflex camera will be described. Further, this camera is a camera of a type in which the leading end portion of the film is automatically sent out from inside the loaded film cartridge. As shown in FIGS. 1 and 2, the single-lens reflex camera 11 is provided behind the taking lens (not shown),
An aperture 4c that determines the filming angle of view of the film is formed in the camera body 4, and the film 5 is stretched so as to face the rear side of the aperture 4c.

Behind the film 5, the film 5
In order to ensure the flatness of the film, a film pressure plate 6 for pressing the film forward is arranged. The film pressure plate 6 is elastically held so as to be biased forward by a pressure plate holding member 7 arranged behind the film pressure plate 6. At the rearmost portion of the camera body 4, a back cover 10 as an exterior member of the camera is provided integrally with the camera body. Therefore, this back cover 10
A gap space having a considerably large area is formed between the pressure plate holding member 7 and the pressure plate holding member 7. In the camera of this embodiment, part of the back cover 10 or part of the left and right side walls can be opened and closed, and the film cartridge is loaded from here.

Then, a first flexible printed circuit board (hereinafter referred to as an FPC) is provided along the entire upper surface of the camera body 4 so as to include the upper surface of the pentaprism arranged at the upper center of the camera body 4. ) 1 is arranged so that electrical components can be mounted. Further, in the rear part of the camera body 4, the second FPC 2 is formed so as to occupy substantially the entire area of the gap space 8 formed between the pressure plate holding member 7 and the back cover 10. Electrical components 9a and 9b are mounted on the back surface and arranged. The second FPC
2 has a large mounting area in which its lower end portion is bent forward at an angle of about 90 degrees and is integrally connected along the bottom surface of the camera body 4 to occupy substantially the entire area of the bottom surface. Are formed so as to be able to mount electric parts.

The first FPC 1 is a bent piece in which the left and right sides of the rear edge portion, that is, the rear edge portions on both sides of the eyepiece window 12 of the finder are bent downward at an angle of approximately 90 degrees. The bent piece portion 1 is formed as a portion 1a, 1b.
a and 1b are formed to extend to the upper edge of the second FPC 2. The bent pieces 1a and 1b are provided with electrical contacts (not shown) for exchanging signals. In addition, electric contacts (not shown) are also provided on the left and right sides of the upper edge of the second FPC 2 opposite to the electric contacts of the bent pieces 1a and 1b. The two electric contacts are connected to the first FPC 1 and the second FPC via the connectors 3a and 3b which are already known electric connection means.
It is electrically connected to the PC 2.

The second FPC 2 disposed in the space between the pressure plate holding member 7 and the back cover 10 has a large mounting area on both sides thereof, so that the camera frame is mounted on both sides of the second FPC 2. The main electric components 9a, 9b of the electric circuit are mounted in high density.

The second FPC 2 may be a two-layer FPC in which two pattern layers are formed in order to realize high-density mounting of electric parts and high-density wiring patterns. Needless to say.

Therefore, according to the first embodiment, the main electric components of the electric circuit of the camera are mounted on the second FPC 2 at a high density, and the inside of the gap between the pressure plate holding member 7 and the back cover 10 is efficiently provided. Since it can be arranged, the wide planar space area formed by the back cover 10 attached to the camera body can be efficiently used. Further, since the two FPCs are electrically connected by the electric contacts, the configuration of the FPC can be simplified and the work of mounting the FPC on the camera body can be extremely facilitated. Furthermore, since the electrical connection between the two FPCs is made by the connector, the work efficiency of the electrical connection between the two FPCs is improved.

FIG. 3 shows a second embodiment of the present invention. The mounting structure of this printed circuit board is also mounted along the upper surface portion, the rear surface portion, and the bottom surface portion of the camera body of the single-lens reflex camera 11A similarly to the first embodiment.
It is composed of the FPC 21 and the second FPC 22. The first FPC along the entire top surface of the camera body
21 is arranged so that an electric component can be mounted. Further, a film loading unit for independently loading and unloading a well-known film cartridge is provided facing the cartridge chamber at one side of the rear portion of the camera 11,
By avoiding this, the second FPC 22 occupies substantially the entire area of the gap space formed between the well-known pressure plate holding member (not shown) described in the first embodiment and the back cover. Are arranged so that they can be mounted. The second FPC
Reference numeral 22 denotes a wide mounting area in which the lower end portion is bent forward at an angle of about 90 degrees and is integrally connected along the bottom surface of the camera body to occupy substantially the entire area of the bottom surface. And is arranged so that an electric component can be mounted.

The first FPC 21 is a bent piece in which the left and right sides of the rear edge portion, that is, the rear edge portions on both sides of the eyepiece window 24 of the finder are bent downward at an angle of approximately 90 degrees. The bent piece portions 1a and 1b are formed as portions 21a and 21b, and extend to the upper edge portion of the second FPC 22. A plurality of electrical contact groups (not shown) for exchanging signals are provided at the lower edges of the bent pieces 21a and 21b. In addition, the bent piece portions 21a, 21b on both left and right sides of the upper edge portion of the second FPC 22.
A plurality of electric contact groups (not shown) are also provided at the facing portions of the electric contact groups. The electric contact groups facing each other, for example, a large number of electric contact groups are provided on the same circumference around the coupling opening formed in the center.
Sunflower type connector 23 which is a known electrical connection means
a, 23b, 23c, 23d. As a result, the first FPC 21 and the second FPC 22 are electrically connected.

As described above, also in the second embodiment, the FPC having a wide mounting area of electric parts is avoided by avoiding the film loading portion provided in a part of the back cover forming the exterior of the camera body. Since the rear surface can be arranged on the crocodile, the mounting efficiency of the electric component can be improved.
Moreover, since the main electric components of the camera are mounted on the two FPCs, a simple FPC can be configured. Two more FPCs
Since a sunflower type connector is used as an electrical connecting means between the two, the workability of connecting and disassembling both FPCs is improved and the cost is reduced.

In the case of the second embodiment, the so-called drop-in system in which a part of the outer wall of the camera facing the patrone chamber is opened to drop the patrone for loading the film patrone is most desirable. However, not limited to this drop-in method, for example, if a method of connecting a hard printed circuit board and a flexible printed circuit board with contact points is adopted, the so-called back cover of the rear side of the camera can be used as in a conventional camera. It is also possible to load a film cartridge by opening and closing.

In the first and second embodiments, both FPCs are used.
In addition to the above-mentioned electrical connection means, the connection between them can be performed by already known connection means such as a solder bridge, thermocompression bonding, and jumper wire. Further, the number of contacts for connecting the FPCs and the positions for arranging the contacts are not fixed to the number of contacts and the arrangement positions shown in this embodiment. Further, the two-board structure shown in the present embodiment mainly shows the board structure that is a feature of the present invention, and in addition to the two FPCs, wiring is provided for each part operation system and switch. Needless to say, the board is also provided in the camera body. It goes without saying that the FPC may have a more complicated shape than that shown in this embodiment. It should be noted that although the case where the present invention is applied to the single-lens reflex camera has been described in the above-described embodiments, the present invention is not limited to this, and it goes without saying that the present invention can also be applied to a substrate configuration of a compact camera or the like.

[0021]

As described above, according to the present invention, the second flexible printed circuit board having a large mounting area in which the rear surface of the camera body is disposed on the crocodile is provided in the gap space region of the rear surface in the camera body. , Approximately 9 over the bottom of the camera body
It is bent at an angle of 0 degree and arranged as a series of substrates on which the main electrical components of the camera are mounted. Therefore, the gap space area on the rear surface of the camera body is effectively used to reduce the number of bends and to mount the electrical components. A highly efficient substrate configuration can be realized. In addition, a connector or a sunflower is provided between the electric circuit of the first flexible printed circuit board arranged along the upper surface of the camera body and the electric circuit of the second flexible printed circuit board arranged along the rear surface of the camera body. Since connection is performed using a mold connector or the like, connection work between flexible printed circuit boards can be easily performed, cost can be reduced, and a simple camera board configuration can be provided.

[Brief description of drawings]

FIG. 1 is a perspective view of a printed circuit board mounting structure showing a first embodiment of the present invention.

FIG. 2 is an enlarged vertical cross-sectional view of a main part of a camera provided with the printed circuit board according to the first embodiment.

FIG. 3 is a perspective view of a printed circuit board mounting structure according to a second embodiment of the present invention.

[Explanation of symbols]

1, 21 ... 1st flexible printed circuit board 2, 22 ... 2nd flexible printed circuit board 3a, 3b, 23a, 23b, 23c, 23d ...
Connector (connecting part) 4
Camera body 9a, 9b
Electrical component

Claims (2)

[Claims] 1. A first flexible printed circuit board, which is arranged along an upper surface of a camera body and on which electric parts are mounted, and a first flexible printed circuit board, which is arranged along a bottom surface and a rear surface of the camera body, on which electric parts are mounted. No. 2 flexible printed circuit board, and a plurality of connections provided on the camera rear side of the first flexible printed circuit board, spaced apart in the lateral direction of the camera body, and electrically connected to the second flexible printed circuit board. A printed circuit board mounting structure for a camera, comprising: 2. The printed circuit board mounting of a camera according to claim 1, wherein the plurality of connecting portions are spaced from each other with an eyepiece portion of a photographing optical system provided on a rear surface of the camera interposed therebetween. Construction.