JP2851382B2 - Flexible printed circuit board for camera - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a flexible printed wiring board for a camera (hereinafter, abbreviated as “flexible”).

[Prior Art] Cameras have been increasing in various functions year by year. For this reason, there has been a tendency to increase the number of electronic components and electronic components and boards on which the components are mounted.

Electrical components are located at various locations inside the camera, so when extracting signals from them, you must use a flexible cable for connecting the electrical components and connect them to the main circuit board . Therefore, as the number of electric components increases, the number of connecting flexes also increases, and accordingly, the number of connection points of the main flex in which the main circuit is formed necessarily increases.

 FIG. 4 shows an example of a conventional typical flex arrangement.

In FIG. 1, reference numeral 1 denotes a mirror box, 2 denotes a camera body, 3 denotes a pentaprism, and the pentaprism 3 is disposed above the mirror box 1. Reference numeral 4 denotes a main flexure, and the upper portion of the pentaprism 3 is arranged from the cartridge chamber 2a of the main body 2 to the spool chamber 2b. 5
Denotes a DX contact piece unit, which is connected to a flexible cable 9 for extracting a signal. Reference numeral 6 denotes a focus detection device, which is connected to the signal extraction board 11. 7 is a battery, 8 is
These are DC / DC converters, and these power supply means are connected to a power supply flexible 10. The connection board and the flexible board are connected to the main flexible board 4 by soldering or by connectors.

[Problems to be Solved by the Invention] However, in the above-described conventional example, as the number of signal extraction units increases, the number of connection flexures increases accordingly, and accordingly, between these connection flexures and the main flexure. There was a problem that the number of connection points increased.

As is generally well known, increasing the number of parts not only increases the cost alone, but also increases the number of connection processes, which can cause a reduction in product reliability and an increase in the cost of the entire product. The conventional example is not always preferable. Therefore, in order to solve this problem, a method of connecting a plurality of connection flexible cables in advance and forcibly constructing a continuous flexible cable can be considered. The cost increase was unavoidable, as the result was that the material removal was worsened.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a flexible printed circuit board for a camera which solves the above-mentioned problems, does not require a connecting flexible cable, and does not cause an increase in cost due to the effect of removing the flexible material.

[Means for Solving the Problems] A first configuration for achieving the object of the present invention is that a first portion disposed on an upper surface of a camera and a gap between a side surface of a mirror box and a side wall surface of a cartridge chamber are arranged. A second portion, a third portion disposed on the lower surface of the camera, and a connection portion connected to a plurality of contacts arranged in a vertical direction of the camera on the front side of the patrone room; A fourth portion disposed at the front of the patrone chamber facing a contact; and a fifth portion provided at the front of the camera disposed to face a transmitting portion for transmitting a signal to the photographing lens. In the unfolded state, the first part, the second part, and the third part are linearly arranged,
The fourth portion extends from the second portion in a direction perpendicular to the direction in which the first, second, and third portions are arranged, and the fifth portion extends from the third portion to the fourth portion. The portion extends in the same direction as the extension direction of the portion.

A second configuration for achieving the object of the present invention is that a first portion disposed above the erecting optical system surface located above the camera is disposed between the mirror box side surface and the cartridge chamber side wall surface. A second portion, a third portion disposed on the lower surface of the camera, and a connection portion connected to a plurality of contacts arranged in a vertical direction of the camera on the front side of the patrone room; A fourth portion disposed in front of the patrone chamber facing a contact point, and a fifth portion disposed in an upper portion of the patrone chamber, integrally with the first portion in a deployed state. The second portion and the third portion are arranged in a straight line, and the fourth portion extends from the second portion in a direction perpendicular to the direction in which the first, second, and third portions are arranged. Extending the fifth portion from the fourth portion to the first, second, third It is obtained so as to extend in a direction parallel to the direction of arrangement of the parts.

[Function] According to the flexible printed wiring board of the camera of the present invention, since the connection flex is not required, the manufacturing cost of the camera can be reduced by reducing the number of connection steps and the number of materials.

Embodiment An embodiment of the present invention will be described below with reference to FIGS. 1 to 3.

1 to 3 show an embodiment of the present invention. FIG. 1 is an exploded perspective view, FIG. 2 is a schematic view seen from the front of a camera, and FIG. FIG.

In FIG. 1, reference numeral 1 denotes a mirror box, 2 denotes a camera body, 3 denotes a pentaprism, and the pentaprism 3 is disposed above the mirror box 2. Reference numeral 4 denotes a main flexure, the main portion of which is disposed in a gap narrowed between the mirror box 2 and the main cartridge room 2a. 5 is DX
It is a contact piece unit, and is provided on the front surface of the main body cartridge room 2a. Reference numeral 6 denotes a focus detection device, and reference numeral 7 denotes a battery, which is located in front of the main body spool chamber. 8 is DC / DC
It is a converter.

Here, the main flexible member 4 has a portion B located in a gap between the side surface of the mirror box 1 and the main body cartridge room 2a.
, And is bent and deployed over the entire surface of the patrone chamber 2a, and a DX contact piece connection portion 4a is provided in this portion D.
It is connected to the DX contact piece 5 at the contact piece connecting portion 4a.

A circular part 4f (part F) formed in a circular shape and connected to the upper part of the part B provided with the DX contact piece connection part 4a is further bent and deployed on the patrone chamber upper surface 2a, and is another external signal input means. A signal reading pattern of a mode setting switch of a camera (not shown) is formed.

Further, in the main flexible member 4, a portion A connected to the portion B and located above the camera passes over the pentaprism 3 (in FIG. 3, the bent position at the top ridge line of the pentaprism 3 is indicated by a broken line. ), And is developed to the main body spool chamber 2b side, and a part thereof is connected to the battery 7 and the power supply means of the DC / DC converter 8 as a power supply connection portion 4b.

The remaining part 4d is arranged in the gap between the spool chamber 2b and the mirror box 1, and is connected to an electric circuit unit (shutter, motor) not shown.

On the other hand, in the main flexible 4, a portion 4 c (portion C) located at the lower part of the camera is a connection portion with the focus detection device 6, and is a gap between the side wall surface of the mirror box 1 and the side wall surface of the cartridge chamber 2 a. It is bent and deployed from the portion B located to the lower surface of the mirror box 1 and connected to the focus detection device 6.

Further, a portion E is connected from a portion C located at a lower portion of the camera to a front surface of the camera, and a connection portion 4e for connecting to a pin 1a for transmitting an electric signal to a photographic lens (not shown) is connected to this portion E. Is provided.

FIG. 3 shows a developed state of the main flexible member 4 configured as described above, wherein the portion A, the portion B, and the portion C are arranged in a straight line, and the portion D is separated from the portion B to the portion A, The portion D extends in a direction perpendicular to the direction in which B and C are arranged, and the portion D extends from the portion C in the same direction as the direction in which the portion D extends.

As described above, although the main flexible 4 is provided with the extended portions for connection with various electric parts and devices, the outer shape of the main flexible 4 when expanded is the width of W as shown in FIG. It is efficiently contained within a range having a narrow band shape.

(Correspondence between Invention and Embodiment) In FIG. 3, a portion A corresponds to the first portion of the present invention, a portion B corresponds to the second portion, a portion C corresponds to the third portion, and a portion D corresponds to the fourth portion. In addition, the part E corresponds to the fifth part in claim 1,
The part F corresponds to the fifth part in claim 2.

[Effects of the Invention] As described above, according to the present invention, the first to fifth embodiments are described.
The flexible printed wiring board in which at least the wiring portion is arranged in the portion can be obtained from a single sheet of material by efficient material removal.

[Brief description of the drawings]

FIG. 1 is a front perspective view showing an arrangement of a flexible printed wiring board with respect to a camera, FIG. 2 is a schematic view seen from the front,
FIG. 3 is an exploded plan view of a main flexible printed wiring board, and FIG. 4 is a view showing an arrangement of a typical conventional flexible cable housed in a camera. DESCRIPTION OF SYMBOLS 1 ... Mirror box 2 ... Camera body 3 ... Pentaprism 4 ... Main flexible printed wiring board 2a ... Patrone room, 2b ... Spool room 5 ... DX contact piece, 6 ... Focus detection device 7 ... … Battery 8 …… DC / DC converter

────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yoichi Tosaka 3-30-2 Shimomaruko, Ota-ku, Tokyo Canon Inc. (58) Fields investigated (Int. Cl. ⁶ , DB name) G03B 17/00 G03B 17/02

Claims (2)

(57) [Claims] A first portion disposed on an upper surface of the camera;
A second portion disposed between the mirror box side surface and the patrone chamber side wall surface, and a third portion disposed on the lower surface of the camera.
And a connecting portion connected to a plurality of contacts arranged in the vertical direction of the camera in the front of the patrone room, and a fourth portion disposed on the front of the patrone room facing the plurality of contacts. And a fifth portion provided in front of the camera, which is disposed to face a transmission portion for transmitting a signal to a photographing lens, and in a deployed state, the first portion And the second portion and the third portion are linearly arranged, and the fourth portion is a direction perpendicular to the direction in which the first, second, and third portions are arranged from the second portion. Wherein the fifth portion extends from the third portion in the same direction as the extension direction of the fourth portion. A first portion disposed above the erecting optical system surface located above the camera; a second portion disposed between the mirror box side surface and the patrone chamber side wall surface; and the camera. A third portion arranged on the lower surface of the camera, and a connection portion connected to a plurality of contacts arranged in the vertical direction of the camera on the front surface of the patrone room, and the patrone room facing the plurality of contacts. A fourth part disposed on the front surface and a fifth part disposed above the patrone chamber are integrally provided, and when unfolded, the first part, the second part, and the And the fourth portion extends linearly from the second portion in a direction perpendicular to the direction in which the first, second, and third portions are arranged, and the fifth portion extends in the direction perpendicular to the direction in which the first, second, and third portions are arranged. Is parallel to the direction in which the first, second, and third portions are arranged from the fourth portion. The flexible printed circuit board of the camera, characterized in that extending direction.