JPH07191251A - Flexible substrate supporting structure for lens barrel - Google Patents

Abstract

PURPOSE:To provide flexible substrate mounting structure for a lens barrel by which a flexible substrate can be mounted in limited space without providing a special member for supporting the flexible substrate. CONSTITUTION:The lens barrel is provided with a moving lens barrel 31 supported to be moved in an optical axis direction in a fixed lens barrel 21 integrally fixed on a camera main body. The flexible substrate 51 drawn out from the rear of the moving lens barrel 31 and drawn out from the front of the fixed lens barrel 21 to the outside of the lend barrel 21 is housed in a substrate housing recessed part 24 formed on the inner peripheral surface of the moving lens barrel housing part 22 of the fixed lens barrel 21, and pressed by a light shielding ring 81 interposed between the housing part 22 and the lens barrel 31.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lens barrel for still cameras, video cameras and the like.

[0002]

2. Description of the Related Art Recent cameras, for example, a lens shutter type camera, are provided with a shutter / autofocus device (hereinafter referred to as "shutter device") in a moving lens barrel of a photographing lens. The shutter control device is connected by a flexible board.
This flexible board is designed to support the flexible board in order to support the movement of the movable lens barrel, and to mount the flexible board so that it does not enter the shooting optical path or obstruct the movement of the lens group. It was common to provide members.

[0003]

It is an object of the present invention to apply a flexible substrate mounting structure of a lens barrel which enables mounting of the flexible substrate in a limited space without providing a special member for supporting the flexible substrate. The purpose is to do.

[0004]

SUMMARY OF THE INVENTION The present invention that achieves this object is a lens barrel having a movable barrel movable in the optical axis direction in a fixed barrel integrally fixed to a camera body. A flexible substrate that is pulled out from the rear side, extends forward in the space formed by the fixed lens barrel and the movable lens barrel, and is pulled out from the front portion of the fixed lens barrel to the outside of the fixed lens barrel. It is characterized in that it is supported in a space formed by a light leakage prevention member interposed therebetween and an inner diameter portion of the fixed lens barrel.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to illustrated embodiments. FIG. 1 is an exploded perspective view showing a main part of a lens barrel unit of a lens shutter type camera to which the present invention is applied, and FIG. 2 is a cross-sectional view showing the main part of the lens shutter type camera taken longitudinally along an optical axis. It is a figure. The present embodiment is a retractable type single focus lens shutter type camera. The fixed lens barrel 11 fixed to the fixed block 13 of the camera body 11 is attached with lens-related main members such as the shutter block 41 and the lens group L, and the CP in the shutter block 41 and the camera body 11 is attached.
The U, the power source (not shown) and the like are electrically connected by the flexible substrate 51.

The movable lens barrel housing portion 22 formed in the fixed lens barrel 21 is movable in the optical axis direction so as to be movable back and forth.
1 is held. A guide protrusion 32 is provided on the outer peripheral surface of the movable lens barrel 31, and the guide protrusion 32 enters a guide groove portion 23 formed in the movable lens barrel housing portion 22 and extending parallel to the optical axis O. ing. The guide protrusion 32 has two guide holes 33 and 34 extending parallel to the optical axis O.

One of the guide holes 33 is slidably fitted into a guide pole 60 fixed in the guide groove portion 23 in parallel with the optical axis O, and slides in the movable lens barrel housing portion 22 in the optical axis O direction. Guide freely. A female screw 35 is inserted into the other guide hole 34, and is fixed to the guide protrusion 32 by a holding plate 36. Then, the fixed lens barrel 21 is attached to the female screw 35.
A feed screw 63 for driving the lens in the optical axis direction is screwed. That is, the fixed lens barrel 21 is guided by the guide pole 60 by the rotation of the feed screw 63 to move back and forth in the optical axis direction.

The front and rear ends of the guide pole 60 and the feed screw 63 are fixed to the fixed lens barrel 21 by the main plate 6.
1. The bearing plate 62 is pivotally supported. On the bottom surface of the guide groove portion 23 and the lower end surface of the guide hole 33 facing the bottom surface,
A brush 28 and an AF code plate 34 for detecting the position of the fixed barrel 21 in the optical axis direction in a relatively large step are provided. On the bearing plate 62, a light shielding portion 62a for bending the reflected light from the guide pole 60 and the like is bent and formed. An antireflection process such as attaching an antireflection member is applied to the surface of the light shielding portion 62a that faces the photographing optical path.

The feed screw 63 is linked with an encoder plate 68 via a gear 64 fixed to the tip end thereof, and reduction gear trains 65, 66 and 67 axially supported by a gear 62 meshing with the gear 64. There is. The encoder plate 68 constitutes a known rotation detecting means in cooperation with the photo interrupter 69, and detects the rotation amount of the feed screw 63, that is, the position of the fixed barrel 21 in finer steps than the guide poles 60 and 34. . The feed screw 63 is driven by a motor 70 mounted on the fixed barrel 21 via a gear train (not shown). In FIG. 1, reference numeral 69b is a cushion interposed between the photo interrupter 69 and the master plate 67 in a compressed state, and fixes the photo interrupter 69 to the master plate 67 by its elastic restoring force. Reference numeral 25 is a space formed in the fixed lens barrel 21 for accommodating the pulse plate 68 and the photo interrupter 69.

A shutter block 41 is fixed inside the movable lens barrel 31. This shutter block 41
Includes a normally closed shutter blade 43, and when a predetermined shutter drive signal is input from the shutter control device via the flexible substrate 51, the shutter blade 43 is opened and closed to perform a predetermined exposure. The lens group L is fixed to the tip of the shutter block 41 via a lens holding frame 45. In FIG. 2, reference numeral 4
Reference numeral 7 denotes a shutter mask that cuts off light other than the image-forming light, and also has a function of covering the flexible substrate 51 exposed on the film surface 18 side of the shutter block 41.

The above is the basic configuration of the camera to which the present invention is applied. The mounting structure of the flexible substrate 51, which is a feature of the present invention, will be described below with reference to FIGS. 3 to 8. 3 is a cross-sectional view of the vicinity of the mounting portion of the flexible substrate 51 taken in a direction orthogonal to the optical axis from the front, FIG. 4 is a perspective view of the flexible substrate 51, and FIGS. 5 to 8 are cutting lines in FIG. V-V, VI-VI, VII-
FIG. 7 is an enlarged sectional view taken along line VII and VIII-VIII.

The flexible substrate 51 is housed in a substrate housing recess 24 formed on the inner peripheral surface of the movable lens barrel housing portion 22 with a circling portion 51c and a straight portion 51d, and one end of the flexible substrate 51 is the front end of the fixed lens barrel 21. Is pulled into the camera body 11, and the other end extends rearward of the movable lens barrel 31, and is retracted from the rear into the movable lens barrel 31 via the curved portion 51e and is connected to the shutter block 41.

The shape of the flexible substrate 51 is as shown in FIG. The flexible substrate 51 is the fixed lens barrel 2
1. The bent portion 51 that enters the fixed lens barrel 21 through the gap between the photo interrupter 51g and the fixed lens barrel 21 in order from the connection portion 51a that is connected to the control means inside the camera body 11 outside 1.
b, a revolving portion 51c that revolves along the flexible substrate housing recess 24, and straight portions 51d and 180 that are bent from the revolving portion 51c and extend rearward of the movable lens barrel 31 toward the film surface 18 in parallel to the optical axis X. Moving lens barrel 3 with different degrees
1 includes a curved portion 51e that enters inside 1, and a connection end portion 51f that is bent in the optical axis O direction and is connected to the shutter block 41. The curved portion 51e moves (extends / contracts) in the optical axis direction when the movable lens barrel 31 moves in the optical axis direction, and follows the movement of the movable lens barrel 31.

FIG. 3 shows a state in which the flexible board 51 is housed in the board housing recess 24. Although not shown in detail, the substrate storage recess 24 has a linear recess 51a and a circular recess 24a which stores the circular part 51c and extends in the circumferential direction.
It has a linear recess 24b extending in the optical axis direction for housing d.

The movable lens barrel 31 is fitted between the front end of the fixed lens barrel 21 and the movable lens barrel 31 as a light leakage prevention member for preventing outside light from entering the camera body 11 through the gaps. A C-shaped light-shielding ring (light leakage prevention member) 81 and an annular light-shielding curtain 85 which are attached are arranged.
The light shielding ring 81 is formed in a C shape with a synthetic resin or the like having an elastic material, and is configured to tighten the movable lens barrel 31 by its elastic force.

The light-shielding ring 81 has a flange 82 protruding from the outer peripheral surface thereof fitted into the fitting portion 26 formed on the inner peripheral surface of the movable lens barrel housing portion 22 (see FIG. 5). The positioning protrusion 83 protruding from the flange 82 serves as the fitting portion 2
It is fitted in a positioning hole 27 formed in the bottom of the plate 6 (see FIG. 6) and is held in a state in which it cannot move nor rotate in the optical axis direction. The flange 82, the positioning protrusion 83, the fitting portion 26, and the positioning hole 27 form an engaging portion. Light-blocking bristles 84 for light-blocking are mounted on the inner peripheral surface of the light-blocking ring 81, and the tip end of the light-blocking bristles 84 elastically contacts the movable lens barrel 31 so that a space between the light-blocking ring 81 and the movable lens barrel 31 is provided. Is shaded.

Further, the light-shielding curtain 86 is attached to a retaining ring 85 having an L-shaped cross section and is arranged between the fixed lens barrel 21 and the front cover, and between the light-shielding ring 81 and the movable lens-barrel housing portion 22. Is blocked, and the space between the fixed barrel 21 and the movable barrel 31 is blocked. By the light-shielding curtain 86, in particular, the flexible substrate 51 is pulled out from the movable lens barrel housing portion 22 (is drawn into the movable lens barrel housing portion 22).
Shading near 1b is complete.

Next, the relationship between the light shielding ring 81 and the flexible substrate 51 will be described with reference to FIGS. 7 and 8.
The circling portion 51c of the flexible substrate 51 is housed and held in a space defined by the substrate housing recess 24, the outer peripheral surface of the light shielding ring 81, and the flange 82.

The flexible substrate 51 is used as the movable lens barrel housing 2
The flange 8 is provided on the part that extends from 2 into the camera body 11.
2 is not provided. Therefore, the flexible substrate 5
1 goes out of the movable lens barrel housing portion 22 through the introduction groove 28 formed in the end portion of the movable lens barrel housing portion 22 in the diametrical direction through the bent portion 51b, and the end portion 51a enters the fixed block 13. It is extended.

As described above, the flexible substrate 5 of this embodiment
Reference numeral 1 denotes a fixed lens barrel 2 by means of a light blocking ring 81 which is a light leakage prevention member for blocking light between the movable lens barrel 31 and the camera body 11.
Since it is held at 1, no special member for holding the flexible substrate 51 is needed.

As described above, in this embodiment, the flexible substrate 15 is used.
The circling portion 51c of the movable lens barrel housing portion 22
Since it is housed in the housing 4 and is circulated by 90 degrees, the circling portion 51c is not pressed by the light shielding ring 81, and the flexible substrate 15 does not bend or drip inadvertently. The orbiting amount may be more or less than this. In addition, the present invention provides the flexible substrate 15 with the winding portion 5
A configuration without 1c is also possible, and the present invention can be applied to a lens barrel having other structure such as a lens barrel that is not retractable and a zoom lens barrel.

[0022]

As described above, according to the present invention, the flexible substrate for connecting the electric member provided in the movable lens barrel and the electric member in the camera body while permitting the movement of the movable lens barrel is used as the movable lens barrel. Since it is configured to be supported in the space between the light leakage prevention member for preventing light leakage between the fixed lens barrel and the fixed lens barrel, a special member for supporting the flexible substrate is not required, and the camera assembly Contributes to ease and reduction in size and weight.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing a main part of a lens barrel unit of a lens shutter camera to which the present invention is applied.

FIG. 2 is a cross-sectional view showing a main part of the same lens shutter type camera, which is longitudinally cut along the optical axis.

FIG. 3 is a cross-sectional view of the vicinity of a mounting portion of a flexible substrate 51, which is cut in a direction orthogonal to an optical axis and is shown from the front.

FIG. 4 is a perspective view of a flexible substrate 51 of the same embodiment.

5 is an enlarged cross-sectional view taken along the section line VV in FIG.

6 is an enlarged cross-sectional view taken along the section line VI-VI in FIG.

7 is an enlarged sectional view taken along the section line VII-VII in FIG.

8 is an enlarged cross-sectional view taken along the section line VIII-VIII in FIG.

[Explanation of symbols]

 11 Camera Body 13 Fixed Block 21 Fixed Lens Barrel 22 Moving Lens Barrel Storage 23 Guide Groove 23 24 Substrate Storage Recess 26 Fitting 27 Positioning Recess 28 Brush 31 Moving Lens 32 Guide Projection 33 Guide Hole 34 Guide Hole 41 Shutter Block 51 flexible substrate 51a connection end 60 guide pole 63 feed screw 81 light-shielding ring 82 flange 83 positioning protrusion

Claims (3)

[Claims] 26 1. A lens barrel having a movable lens barrel that is movable in the optical axis direction inside a fixed lens barrel that is integrally fixed to a camera body, wherein the fixed lens barrel is pulled out from the rear of the movable lens barrel. A flexible substrate that extends forward in a space formed by the movable lens barrel and is drawn out from the front portion of the fixed lens barrel to the outside of the fixed lens barrel is provided with a light leakage prevention member interposed between the fixed lens barrel and the movable lens barrel. A flexible substrate supporting structure for the lens barrel, wherein the flexible substrate supporting structure is supported in a space formed by an inner diameter portion of the fixed lens barrel. 2. The light leakage prevention member according to claim 1, wherein the light leakage prevention member is formed into a C-shape by an elastic member so as to elastically clamp an outer peripheral surface of the movable lens barrel, and engages with an engaging portion of the fixed lens barrel. A flexible substrate support structure for a lens barrel, which has a positioning engagement portion that is held so as not to rotate and move in the optical axis direction. 3. The flexible substrate of the lens barrel according to claim 1, wherein a substrate housing recess for housing the flexible substrate is formed at least at a position facing the exposure member member on the inner surface of the fixed lens barrel. Support structure.