JPH0733223Y2 - Electrical signal transmitter for camera - Google Patents

Description

[Detailed Description of the Invention] A. Field of Industrial Application The present invention relates to an electric signal transmission device for transmitting an electric signal from a camera body side to a lens barrel, and particularly, according to a focal length such as a multifocal camera. It is used in a camera that has a lens barrel that is extended from the camera body.

B. Conventional Technique This type of device is conventionally configured as shown in FIGS. 3 and 4 (Japanese Utility Model Laid-Open No. 61-206943, etc.).

A lens barrel 1 which is extended and retracted along the photographing optical axis
The electric device (not shown) provided in the above is connected to the electric device (not shown) on the camera body 3 side through the flexible printed board 2 which can be expanded and contracted. Thereby, the electric signal from the main body 3 side is transmitted to the electric device in the lens barrel 1,
The shutter 5 and the like are drive-controlled. The flexible printed board 2 has bent portions 2a and 2b and is folded as shown in FIG. 3 when the lens barrel 1 is in the retracted position, and when the lens barrel 1 moves to the retracted position,
Elongate as shown.

C. Problems to be Solved by the Invention However, in the above-described conventional device, a special space is provided between the rear surface of the shutter 5 and the front surface of the camera body 3 and on the side of the photographing optical path, and The width of the flexible printed board 2 is accommodated in the left-right direction of the camera so that the flexible printed board 2 does not intrude into the optical path of the image pickup. Therefore, it is necessary to secure a large installation space, which causes a problem that the camera body becomes large.

An object of the present invention is to provide an electric signal transmission device for a camera, in which a flexible printed board can be arranged in a small space and the camera body is made compact.

D. Means for Solving the Problems Referring to FIG. 1 showing an embodiment, the present invention provides an electric device 51 provided on a lens barrel 30 which is extended and retracted along an optical axis of photographing. The electric device 12 provided in the camera body 10 is connected to the flexible printed board 11 which can be expanded and contracted, and the flexible printed board 11 is extended when the lens barrel 30 is in the extended position and is folded when the lens barrel 30 is in the extended position. It is applied to electric signal transmission device of camera. And the above-mentioned problem is that when the lens barrel 30 moves with the lens barrel 30 and the lens barrel 30 is in the retracted position,
The space 13 in which a part of the flexible printed board 11 is housed is almost cut off from the photographing optical path 72, and the flexible printed board 11 is driven as the lens barrel 30 is driven to the extended position.
When the lens barrel 30 is in the retracted position, the flexible print in the space 13 is provided with the cone-shaped light-shielding tube 71 that connects the space 13 and the shooting optical path 72 to the extent that the space 13 can enter the shooting optical path 72. When the plate 11 is folded, part of the flexible printed board 11 is close to the back surface 71a of the light shielding tube 71, and when the lens barrel 30 is in the extended position, the flexible printed board 11 that is convex toward the photographing optical path 72 side. Place the bent portion 11a in the light-shielding tube 71.
The rear surface 71a of the light shielding cylinder 71 prevents the bent portion 11a of the flexible printed board 11 from entering the photographing optical path 72 from the space 13 when the lens barrel 30 is retracted. .

E. Action Since the flexible printed board 11 is rationally accommodated in the space 13 that is necessarily formed on the back surface 71a of the light-shielding cylinder 30, no special accommodation space is required as in the past, which contributes to downsizing of the camera. To do. Further, when the lens barrel 30 is retracted, the flexible printed circuit board 11 is moved by the movement of the light shielding barrel 71 so that the optical path of the flexible printed board 11 is not changed.
The space 13 and the photographing optical path 72 are communicated with each other to such an extent that they can enter the 72, but the back surface 71a of the light-shielding cylinder 71 suppresses the bent portion 11a of the flexible printed board 11 so that the bent portion 1
It is possible to prevent 1a from entering the photographing optical path 72 from the space 13 and the flexible printed board 11 from being sandwiched between the light shielding cylinder 71 and the camera body 10.

F. Embodiment An embodiment of the present invention will be described based on FIGS. 1 and 2.

(I) Configuration of the Embodiment FIGS. 1 and 2 are transverse sectional views of the camera when the lens barrel is switched between the wide-angle position and the telephoto position.

The camera body 10 is provided with a fixed lens barrel 21, and a helicoid 21a is engraved on the inner peripheral surface thereof. A ricoid 22a is meshed with the helicoid 21a outside the outer peripheral surface of the drive lens barrel 22, and the drive lens barrel 22 moves along the optical axis while being rotated by the driving force of a motor (not shown). On the other hand, the lens barrel 30 has a lens barrel outer cylinder 31, which is engraved on the outer peripheral surface of the lens barrel 30 to the outside.
31a is inscribed on the inner peripheral surface of the drive lens barrel 22 and is inwardly formed into the recoid 22b.
The lens barrel 30 is installed so as to be movable only along the optical axis. The lens barrel 30 has, for example, a telephoto side extension position, a wide-angle side extension position, and a reset position further extended therefrom. The lens barrel outer cylinder 31 is provided with a shutter unit 51 having a shutter portion 52 via a holding frame (not shown), and the lenses 50a, 50b, 50c, 50
The photographing optical system 50 having d is held by the shutter unit 51. As shown in FIG. 2, a sub-photographing optical system 60 having lenses 60a, 60b, 60c and 60d and held by a holding member 61 is provided on the rear side of the shutter section 52. This sub-photographing optical system 60, when the lens barrel 30 is switched to the telephoto position,
It is inserted into the optical path by a known insertion / removal mechanism. Further, a cone-shaped light-shielding light-shielding cylinder 71 is provided on the inner rear side of the lens-barrel outer cylinder 31, and the light-shielding cylinder 71 defines a photographing optical path 72 at the time of transfer and at the time of transfer and extension. Prevents leakage of light and irregular reflection.

The shutter unit 51 is connected to the printed board 12 fixed to the main body 10 by the flexible printed board 11. That is, the flexible printed board 11 whose one end is connected to the shutter unit 51 is arranged in the space 13 formed by the lens barrel outer cylinder 31 and the rear surface 71a of the light shielding cylinder 71 on the side of the camera, as shown in FIG. When the lens barrel 30 is switched to the wide-angle position, the lens barrel 30 is bent at the front side of the space 13 by a preliminarily bent bend as shown in the figure, and then along the back surface 71a of the light-shielding barrel 71 on the side of the camera. It extends to the rear of the camera, is bent again at the rear of the camera and extends to the front, and the other end is connected to the printed circuit board 12. When the lens barrel 30 is switched to the telephoto position, as shown in FIG. 2, the flexible printed board 11 extends, and the bent portion 11a has the light-shielding tube 7.
It is kept at 1. Further, when the lens barrel 30 is switched to the reset position, the state shown by the chain double-dashed line in FIG. 2 is obtained.

A friction and antireflection sheet 15 is provided on the surface of the flexible printed board 11 on the side of the light shielding tube, which suppresses friction between the flexible printed board 11 and the light shielding tube 71 and prevents light from being reflected. . Here, the cone-shaped light-shielding cylinder 71 described above substantially blocks the space 13 for accommodating the flexible printed board 11 from the photographing optical path 72 when the lens barrel 30 is in the retracted position as shown in FIG. Tube 30
The space 13 and the photographing optical path 72 are made to communicate with each other to the extent that the flexible printed board 11 can enter the photographing optical path 72 from the space 13 when driven to the extended position.

A CPU 14 is provided on the printed circuit board 12, and a signal from the CPU 14 is input to the shutter unit 51 via the flexible printed board 11, whereby focusing by the photographing optical system 50 and shutter time of the shutter section 52 are controlled. . Note that 100 is an exterior cover that covers the main body 10.

(II) Comparison between Configuration of Embodiment and Configuration of Invention The shutter unit 51 constitutes an electric device on the lens barrel 30 side, and the printed circuit board 12 and the CPU 14 constitute an electric device on the camera body side.

(III) Operation of the embodiment When the lens barrel 30 is switched to the telephoto position shown in FIG. 2 and the drive lens barrel 22 is rotationally driven by a motor (not shown) to switch to the wide-angle position, the helicoid 21a The drive lens barrel 22 is retracted by the engagement with the helicoid 22a, and the lens barrel 30 is retracted by the engagement of the helicoid 22b and the helicoid 31a. When the lens barrel 30 is retracted, the flexible printed board 11 is folded while the bent portion 11a thereof is held down by the back surface 71a of the light shielding barrel 71, and when the lens barrel 30 reaches the wide-angle position, the flexible printed board 11 is bent and bent to the first position. It will be in the folded state shown in the figure. Therefore, even when the flexible printed board 11 can enter the photographing optical path 72 while the lens barrel 30 is being retracted, the flexible printed board 11 is prevented from entering the photographing optical path 72. Further, the friction and antireflection sheet 15 suppresses the friction between the flexible printed board 11 and the light shielding cylinder 71 and also prevents the reflection of light.

In the present embodiment, the back surface 71a of the light shielding tube 71 on the side of the camera.
Although the flexible printed board 11 is arranged in the space between the lens barrel outer cylinder 31 and the drive lens barrel 22, the flexible printed board 11 is arranged in the space between the upper and lower surfaces of the light shielding cylinder 71 and the camera body. You may comprise. Further, in a camera in which the lens barrel 30 is driven by a feeding mechanism other than a helicoid, if a flexible printed board is housed in the space between the light blocking barrel 71 and the wall surface of the spool chamber or the cartridge chamber. Good.

G. Effect of the Invention According to the present invention, the flexible printed circuit board is reasonably accommodated in the space that is inevitably formed in the structure of the camera, so there is no need to secure a special accommodation space and the camera body is compact. Can be realized. Also, since the bent portion of the flexible printed board is suppressed on the back surface of the light shielding tube, even if the flexible printed board can enter the shooting optical path due to the movement of the light shielding tube when the lens barrel is retracted, the flexible printed board can be bent. It is possible to prevent the part from entering the shooting optical path from the space and prevent the flexible printed board from being sandwiched between the light-shielding tube and the camera body.

[Brief description of drawings]

1 and 2 are cross-sectional views of a camera showing an embodiment of the present invention. FIG. 1 shows a state in which a lens barrel is switched to a wide-angle position and FIG. 2 is switched to a telephoto position. Show. FIGS. 3 and 4 are vertical sectional views of a conventional camera. FIG. 3 shows a state in which the lens barrel is switched to the wide-angle position and FIG. 4 is switched to the telephoto position. 10: Camera body 11: Flexible printed board 11a: Bent part, 12: Printed circuit board 14: CPU, 30: Lens barrel 51: Shutter unit 52: Shutter part, 71: Light-blocking cylinder 71a: Back side

Front page continuation (72) Inventor Kiyosada Machida 1-6-3 Nishioi, Shinagawa-ku, Tokyo Inside Oi Manufacturing Co., Ltd. (72) Inventor Yuji Katano 1-3-6 Nishioi, Shinagawa-ku, Tokyo Japan Optical Industry Co., Ltd. Oi Manufacturing Co., Ltd. (72) Creator Minoru Kato 1-6-3 Nishioi, Shinagawa-ku, Tokyo Japan Optical Manufacturing Co., Ltd. Oi Manufacturing Co., Ltd. (56) References Kai 60-150533 (JP, U) Actual Sho 64-43336 (JP, U)

Claims (1)

[Scope of utility model registration request] 1. An electric device provided on a lens barrel that is extended along an optical axis for photographing and an electric device provided on a camera body are connected by a flexible printed board capable of expanding and contracting, and the flexible print is provided. In the electric signal transmission device of the camera, the plate expands when the lens barrel is in the extended position and is folded when the lens barrel is in the retracted position.The plate moves together with the lens barrel and when the lens barrel is in the retracted position. , The space for accommodating a part of the flexible printed board is substantially cut off from the photographing optical path, and the flexible printed board may enter the photographing optical path from the space as the lens barrel is driven to the extended position. When the lens barrel is at the retracted position, it is provided with a cone-shaped light-shielding tube that allows the space and the shooting optical path to communicate with each other. When the flexible printed board in the space is folded, a part of the flexible printed board is close to the back surface of the light blocking tube, and the lens barrel is in the extended position, the flexible printed board is convex toward the photographing optical path. The bent portion of the printed board is suppressed by the back surface of the light-shielding tube, and when the lens barrel is retracted, the back surface of the light-shielding tube prevents the bent portion of the flexible printed board from entering the photographing optical path from the space. Characteristic camera electrical signal transmission device.