JPH06273833A - Printed board mounting structure for camera - Google Patents

Abstract

PURPOSE:To provide a compact and inexpensive printed board mounting structure for a camera, capable of increasing parts mounting efficiency, reducing bending and making mounting work on a camera main body easy. CONSTITUTION:The camera is equipped with a first flexible printed board 1 arranged along the rear surface of the camera main body 17, a second flexible printed board 2 consecutively formed from the top edge of the first flexible printed board 1 and arranged along the top surface of the camera main body 17, third flexible printed boards 3a and 3b consecutively formed from the front edge of the second flexible printed board 2 and arranged along the front surface of the camera main body 17, a notched part 3c provided so that the luminous flux of a photographic optical system can pass and at least, the electrical part of the camera arranged on the first flexible printed board 1.

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 of the camera. However, in recent years, the scale of circuit implementation has increased with the increasing sophistication of electronic functions and multifunctionality, and various switches and sensors have been distributed and arranged in various places in the camera. The wiring of the flexible printed circuit board for wiring mounting has become complicated to sew a narrow space inside the camera. In addition to this, the miniaturization of cameras is rapidly progressing, and it is very difficult to design a flexible printed circuit board that has a large mounting area on one flat part because the large space inside the camera can hardly be secured. The mounting of electrical components on the board is also decentralized, which requires use of a large area of the flexible printed circuit board for wiring between the electrical components. Also, with the decentralization of electric parts, the shape of the flexible printed circuit board has become very 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 printed circuit board mounting structure of the camera. For example, in the printed circuit board mounting structure of a camera disclosed in Japanese Patent Application Laid-Open No. 2-201337, in a camera of recent years, the lens barrel becomes large in size, and the upper space of the lens barrel becomes narrower.
AF which was arranged as one in the upper space
The (autofocus) light emitting / receiving portion is divided into an AF light emitting / receiving element substrate and an AF circuit substrate, and only the necessary AF light emitting / receiving element substrate is arranged in the space above the narrowed lens barrel. There is a technique in which the circuit board is arranged in another space to effectively use the narrow space of the lens barrel to downsize the camera.

Further, in the printed circuit board mounting structure of the camera disclosed in Japanese Patent Laid-Open No. 2-228640, a flexible printed circuit board mounted on the front surface of the camera while avoiding the lens barrel portion is located on the left side of the lens barrel portion. A first portion to be mounted on the front surface of the camera, a second portion to be mounted on the front surface of the camera on the right side of the lens barrel portion, and a first portion to be mounted on the front surface of the camera above or below the lens barrel portion. And a first part to a third part are integrally formed as one piece, and at least one of the first part and the second part is at least one vertical part when mounted on a camera. The shape is designed to be folded back at an angle of 180 degrees along the line. In this way, when the flexible printed circuit board is punched from the original plate,
Since no large punching dust is generated, the manufacturing cost can be reduced significantly as compared with the conventional case.

[0005]

However, in the printed circuit board mounting structure of the camera disclosed in Japanese Unexamined Patent Publication No. 2-201337, the number of boards is increased because the boards are divided, and electrical contacts for connecting the boards are provided. And the number of steps for mounting the board on the camera increases, which is a disadvantage. Further, in the above-mentioned JP-A-2-228640, the space in which the flexible printed circuit board is arranged is the front surface and the upper surface of the camera body, which is the same as the space in which the conventional flexible printed circuit board is arranged. Dispersion of mounted components is unavoidable, and the mounting efficiency of the components is reduced in the periphery of the flexible printed circuit board arranged in front of the camera body at an angle of 180 degrees, and the pattern is broken at the bent portion. There is a problem that the possibility increases.
Further, in the conventional camera, it is difficult to dispose the board on which the main electric components are mounted in the space on the back surface of the main body, and therefore it has not been implemented.

The object of the present invention was made in view of the above-mentioned problems of the prior art. It has a high component mounting efficiency, little bending, and facilitates mounting work on the camera body. It is to provide a printed circuit board mounting structure.

[0007]

A printed circuit board mounting structure for a camera according to the present invention comprises a first flexible printed circuit board arranged along a rear surface of a camera body, and an upper end of the first flexible printed circuit board. A second flexible printed circuit board that is continuously formed and is arranged along the upper surface of the camera body, and is continuously formed from the front end of the second flexible printed circuit board, and is arranged along the front surface of the camera body. A third flexible printed circuit board, a notch provided on the third flexible printed circuit board so that the light flux of the photographing optical system can pass through, and at least the first flexible printed circuit board. And electrical parts of the camera.

[0008]

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. As shown in FIGS. 1 and 2, a camera body 21 on one side on the back side of the camera body 17 is provided with a cartridge chamber 21 in which a film cartridge 19 is loaded, and a camera body 17a on the other side. A spool chamber 22 in which a film winding spool 20 is rotatably arranged is provided in the. A lens barrel 7 is arranged in the center of the front of the camera body 17, and a photographing lens group 11 is arranged inside the lens barrel. An aperture 17c that determines the filming angle of view of the film is formed in the rear of the taking lens group 11, is drawn out from the cartridge 19 so as to face the aperture 17c, and is attached to the winding spool 20 by the leader portion. The film 18 wound with is spread.

A film pressure plate 13 for pressing the film 18 is provided behind the film 18 in order to ensure the flatness of the film 18. This pressure plate 13
Is elastically held so as to be urged forward by a pressure plate holding member 14 arranged behind it.

Further, the rear side of the patrone chamber 21 to one side surface has an L-shaped cross section,
A film loading / unloading lid 15 for independently loading / unloading the film cartridge 19 is provided. Adjacent to the film loading / unloading exclusive lid 15, the back lid 16 covers the rear central portion of the camera main body 17 and the rear portion of the spool chamber 22 as an exterior member on the rear surface from the back surface to the other side surface of the camera main body 17. It is arranged.

Then, in the space 17d between the pressure plate holding member 14 and the back cover 16, the first flexible print on which the main electric components 12a and 12b of the electric circuit of the camera are mounted on the front surface and the back surface, respectively. Substrate (hereinafter
An FPC 1) is arranged along the rear surface of the camera body 17. Then, with the upper end portion of the first FPC 1 facing forward, the second FPC 2 is bent at an angle of approximately 90 degrees to be continuous with the same FPC 1, and the second FPC 2 on which components are mounted along the upper surface of the camera body 17 is the body 17. The camera main body 17 is arranged above the second FPC 2 and further bends the front end portion of the second FPC 2 downward at an angle of approximately 90 degrees to be connected to the FPC 2.
Along the front surface of the main body 17a and the main body 17b
3rd FPC3 that can mount components on the front in front of
a and 3b are provided. This third FPC 3a, 3
b is the lens barrel 7 and an AF projection window 8 to be described later,
A portion facing the finder window 9 and the daylighting window 10 is formed as a cutout portion 3c.

The third F in the camera body 17
Adjacent to the PC 3b, a strobe circuit board 4 on which circuit components for driving a strobe (not shown) are mounted is provided on the outer side of the camera body 17 on the side. On the front surface of the camera body 17, directly above the strobe circuit board 4, there is provided a strobe window 5 (not shown) through which the emitted light beam of the strobe passes. Further, a lens barrel 7 is disposed in the center of the camera body 17 so as to project forward, and infrared light for AF is provided on the front face of the third FPC 3b near the lens barrel 7. A light receiving window 6 for receiving is provided. The AF infrared light receiving window 6 receives the infrared light reflected by the subject from the infrared light emitting element for AF (not shown) by the light receiving element (not shown). It is for passing light.

An AF projection window 8 is formed in the upper center of the front surface of the camera body 17 near the third FPC 3a.
A finder window 9 is formed in the center, and a daylighting window 10 is arranged near the third FPC 3b. The AF floodlight window 8
Is for projecting the infrared light for AF from the infrared light emitting element toward an external front object, and the finder window 9 is for observing the object. The front cover 23 forming the exterior wall of the camera is formed on the front side of the camera body 17 on both sides of the lens barrel.
a and 23b are provided.

As described above, in the printed circuit board mounting structure of the first embodiment, as described above, the first FPC 1 and the camera body 17 arranged along the rear surface of the camera body 17.
Of the second FPC 2 arranged along the upper surface of the camera, and the third FPCs 3a, 3 arranged along the front surface of the camera body 17.
b are respectively bent at an angle of about 90 degrees and are continuously attached to the camera body.

Therefore, according to the first embodiment, the main electric components of the electric circuit of the camera are mounted on the first FPC 1 at high density, and the main electric components are efficiently arranged in the space between the pressure plate holding member 14 and the back cover 16. Since it can be installed, it is possible to efficiently use the wide planar gap space area formed by the back cover attached to the camera body. Further, since the FPC is three-dimensionally formed with a small number of bends and attached to the camera body, it is possible to provide a simple printed circuit board mounting structure with good workability.

In the case of the first embodiment, the so-called drop-in system, in which a part of the outer wall of the camera facing the cartridge chamber is opened to drop the cartridge for loading the film cartridge, is most desirable. However, not limited to this drop-in method, if a method of connecting a hard printed circuit board and a flexible printed circuit board with a contact point is adopted, like a conventional camera,
By opening and closing the so-called whole back cover behind the camera,
It is also possible to load a film cartridge.

3 and 4 show a second embodiment of the present invention. The mounting structure of this printed circuit board is also the first
Similar to the embodiment, the rear surface portion, the upper surface portion of the camera body 17A,
First FPC 31 to third F mounted along the front surface
It is composed of PCs 33a and 33b. The camera body 17A is configured to have a well-known spool chamber, aperture, cartridge chamber, film pressure plate, and the like, all of which are not shown. A first FPC 31 is arranged along the rear surface of the camera body 17A behind the film stretched so as to face the aperture.
1 is the main electric components 35a, 35 of the electric circuit of the camera.
b (see FIG. 4) and an LCD (liquid crystal) display plate 34 for displaying photographing information and the like are mounted on the back surface thereof. The L
The CD display plate 34 is mounted rearward on the back surface of the first FPC 31 in order to display the date, various mode states of the camera, etc. to the outside, and is a back cover (illustrated in the figure) which is an exterior member of the camera body. The display surface of the LCD display plate is exposed from the display window provided in the (not).

Then, the first FPC 31 is bent at an angle of approximately 90 degrees with its upper end facing forward, and the first FPC 31 is bent.
The second FPC 32 is arranged on the main body 17A so that components can be mounted along the upper surface of the camera main body 17A, and the front end portion of the second FPC 32 is directed downward to approximately 90 degrees. Third FPCs 33a, 33b are arranged along the front surface of the camera body 17A so as to be able to mount components, and are bent at an angle to be continuous with the FPC 32. This FP
C33a and 33b are the FPCs 3a and 3b of the first embodiment.
Similarly to the above, the notch portion 33c is formed. The lens barrel 37 is arranged in the cutout portion 33c. A film cartridge 36 is loaded in a film cartridge chamber (not shown) on one side of the back side of the camera body 17A.

The above-mentioned first to third FPCs 3 integrated as described above
1, 32, 33a and 33b are three-dimensionally mounted on the camera body. Then, on the first FPC 31,
The main electric components of the electric circuit of the camera are mounted at high density and efficiently, and the LCD display plate is mounted on the rear surface of the FPC 31, and the back cover (not shown) which is an exterior member of the camera body is formed. The display surface of the LCD display plate is exposed from the displayed display window.

Therefore, according to the second embodiment, the first FPC
Since the LCD display plate is directly mounted on the back surface of the device, it is not necessary to separately provide a wiring FPC for the LCD display plate. Further, since the main electric components of the electric circuit of the camera are also mounted on the front surface of the first FPC, the gap space inside the camera body where the rear surface portion of the FPC is disposed can be effectively and efficiently used. You can

In the first and second embodiments, the three-dimensionally formed FPC has a known single-sided FPC, double-sided FPC, and multi-layered FPC in which the pattern layers are multi-layered. Can be realized by Further, it is a matter of course that a plurality of FPCs in which various operation members such as switches are wired may be connected to the FPC integrally formed in the above embodiment. Further, it goes without saying that the FPC may have a more complicated shape than the shape formed in this embodiment.

[0022]

As described above, according to the present embodiment, the flexible printed circuit board is formed by bending it along the rear surface, the upper surface and the front surface of the camera at an angle of about 90 degrees and is disposed in the camera body. , The rear surface of the FPC is provided with the mounting portion for the main electric components of the flexible printed circuit board, and the gap space in the rear portion of the camera body is effectively used to improve the component mounting efficiency. It is possible to provide a simple, printed circuit board mounting structure for a camera that is easy to mount on the camera body, small, inexpensive, and simple.

[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 a lateral cross-sectional view of a main part of a camera in which the printed circuit board according to the first embodiment is arranged.

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

FIG. 4 is a vertical cross-sectional view of a main part of a camera provided with the printed circuit board according to the second embodiment.

[Explanation of symbols]

1, 31 ‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥ 1st flexible printed circuit board 2, 32 ‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥ 2nd flexible printed circuit board 3a, 3b, 33a, 33b ‥‥‥‥‥‥‥ 3rd flexible printed circuit board 3c, 33c ‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥ (Camera electrical parts)

─────────────────────────────────────────────────── ───

[Procedure amendment]

[Submission date] May 18, 1993

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] 0002

[Correction method] Change

[Correction content]

[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 of the camera. However, in recent years, the scale of circuit implementation has increased with the increasing sophistication of electronic functions and multifunctionality, and various switches and sensors have been distributed and arranged in various places in the camera. The wiring of the flexible printed circuit board for wiring mounting has become complicated to sew a narrow space inside the camera. In addition to this, the miniaturization of cameras is rapidly progressing, and it is very difficult to design a flexible printed circuit board that has a large mounting area on one flat part because the large space inside the camera can hardly be secured. mounting electrical components on the substrate also becomes possible to decentralize, had to use a large area of the flexible printed circuit board in this manner for wiring between electrical components. Also, with the decentralization of electric parts, the shape of the flexible printed circuit board has become very complicated, and it has become difficult to develop the electric circuit of the camera on one flexible printed circuit board.

Claims (1)

[Claims] 1. A first flexible printed circuit board arranged along a rear surface of a camera body, and a first flexible printed circuit board formed continuously from an upper end of the first flexible printed circuit board and arranged along an upper surface of the camera body. Two
Flexible printed circuit board and a third flexible printed circuit board formed continuously from the front end of the second flexible printed circuit board and arranged along the front surface of the camera body.
A flexible printed circuit board, a cutout portion provided on the third flexible printed circuit board so that the light flux of the photographing optical system can pass therethrough, and a camera arranged on at least the first flexible printed circuit board. A printed circuit board mounting structure for a camera, comprising: an electric component.