JPH11218657A - Electric connecting structure for lens barrel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make arragement by which an abnormal noise is prevented from being produced and a fautly operation is prevented from occurring even when a flexible printed wiring board attached to a control circuit of a fixed barrel and an electric element of a moving group comes in contact with other parts in a lens barrel. SOLUTION: A flexible printed wiring board 21 connecting a control circuit attached to a fixed barrel 1 and an electromagnetic diaphragm device fixed in a three-group lens barrel 7 rotating and moving in the optical axis direction is made so that its printed wiring surface between a guide plate 14 fixed in parallel with the optical axis direction of the barrel 1 and the electromagnetic diaphragm device becomes a form to be opened to an outer periphery side with respect to the optical axis position at the wise position of the lens barrel 7, the board 21 is disposed in an S-shape nearly in parallel with the optical axis direction and its movable part is formed in a nearly linear shape.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric connection structure of a lens barrel having an electric element integrally attached to a moving lens group which is rotated and extended.

[0002]

2. Description of the Related Art Conventionally, an electric diaphragm device or an electric shutter device integrally mounted on a moving unit that moves in the optical axis direction for focusing or zooming with respect to a fixed cylinder and a control disposed on a fixed portion. As means for electrically connecting the parts to each other, a connection means (conventional example 1) using a lead wire or a flexible printed wiring board with a slack is generally known. In addition, the actual opening 59-12860
A moving member such as an operation ring that moves for focusing or zooming and a fixed cylinder like a wiring device in a lens barrel described in Japanese Patent Application Publication No. 9-1992 are connected to a belt-shaped flexible printed wiring board in the moving direction of the operation ring. There is also known one in which an intermediate portion is folded back and connected (conventional example 2). Furthermore, the flexible printed wiring board is arranged in a spiral band along the inner diameter of the fixed cylinder with the electric diaphragm device moving in the optical axis direction described in Japanese Utility Model Publication No. 6-37371 and the fixed portion. There is also known one that can be connected by bending to a point (conventional example 3).

[0003]

However, in the above-mentioned prior art example 1, when the lead wire or the flexible printed wiring board is loosened comes into contact with other moving lens groups or other members in the fixed cylinder, stress or disconnection occurs, or It is necessary to provide a wide space so as not to generate abnormal noise or malfunction, which is not suitable for downsizing the lens barrel itself. Further, in the above-mentioned conventional example 2, it corresponds only to the case where the moving member moves forward in the optical axis direction with respect to the fixed cylinder, and can be used only when the electric diaphragm device is fixed to a moving group that rotates and extends. could not. Furthermore, in the above-mentioned conventional example 3, a space in the circumferential direction is required so that the flexible printed wiring boards can be spirally arranged in the fixed cylinder, and a flexible printed wiring board developed in a spiral form requires a large area for manufacturing. However, there is a problem that the cost is high.

The present invention eliminates the above-mentioned disadvantages of the prior art,
An electric diaphragm device, an electric shutter device, an image stabilizing device, and other electric elements that are integrally attached to a moving group that rotates and extends in the optical axis direction for focusing or zooming with respect to the fixed cylinder, and are disposed in the fixed portion. Even if there is a fixed or moving member on the inner circumference where the flexible printed wiring connection member operates to electrically connect the control unit that is It is an object of the present invention to provide an electrical connection structure for a lens barrel.

[0005]

In order to achieve the above-mentioned object, according to the present invention, a control unit attached to a fixed cylinder is connected to an electric element provided in a movable group moved in the optical axis direction with respect to the fixed cylinder. The printed wiring surface of the flexible printed wiring connecting member is formed so as to open outward on the optical axis position at the initial rotation position of the moving group.

[0006]

According to the present invention, at least a fixed cylinder, a movable group which is rotated and extended in the optical axis direction with respect to the fixed cylinder, and an electric element integrally fixed to the movable group. A control unit for controlling the electric element attached to the fixing unit integral with the fixing cylinder; a flexible printed wiring connection member for connecting the electric element and the control unit; A fixed side holding member for fixing and holding the flexible printed wiring connection member to the control portion substantially in parallel with the optical axis direction of the fixed cylinder, and is disposed substantially parallel to the radiation direction with respect to the optical axis. The printed wiring surface of the flexible printed wiring connecting member between the fixed side holding member and the electric element is arranged so as to open outward with respect to the optical axis position at the initial rotation position of the moving group. By doing so, the circle on the outer peripheral side of the flexible printed wiring connection member Since the length is required to be longer than the circumferential length on the inner circumferential side, it is pulled to the outer circumferential side at a position approximately at the middle of the rotation amount, and as a result, it is possible to adjust the amount of transfer to the inner circumferential side .

According to a second aspect of the present invention, the flexible printed wiring connecting member is arranged in an S shape substantially parallel to the optical axis direction of the fixed cylinder by the fixed side holding member.
The flexible printed wiring connection allows operation without stress. According to the third aspect of the present invention, since the movable portion of the flexible printed wiring connection member has a substantially linear shape, the operation bending portion can be more easily assembled. According to the fourth aspect of the present invention, the number of components can be reduced by providing the fixed side holding member integrally with the fixed cylinder.

According to a fifth aspect of the present invention, the fixed side holding member and the printed wiring surface of the electric element are integrally fixed to the moving group to which the electric element is integrally fixed. By providing a movable holding member that is held substantially parallel to the optical axis at the intermediate position of the total rotation amount of the electric element to be held, the movable element and the fixed holding member can hold the movable element. The movable area of the flexible printed wiring connection member can be limited to a small space. According to the sixth aspect of the present invention, since the electric element is an electric aperture device, an aperture device capable of rotating and extending can be provided, and a design with a higher degree of freedom can be realized. According to a seventh aspect of the present invention, the electric element is a part of a configuration of a shake correction device that corrects a shake, so that a part of the configuration of the shake correction device can perform rotation advance. Enables a highly flexible design.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. FIG. 1 shows the zoom lens barrel of the present embodiment, in which the upper half shows a wide position state and the lower half shows a tele position state.
FIG. 2 is a perspective view of the main components, FIG. 3 is a developed view of a wide position, FIG. 4 is a developed view of a tele position, FIG. 5 is a front view as viewed from the mount side, and FIG. 7 is a perspective view of the flexible printed wiring board at a wide position, FIG. 8 is a perspective view of the flexible printed wiring board at a tele position, and FIG. 8 is a developed view of the flexible printed wiring board. In the figure, reference numeral 1 denotes a fixed cylinder which is integrally fixed to a front portion of a mount 2 and has a linear guide groove 1 on its peripheral surface.
a, a third-group cam 1b and a fifth-group cam 1c are formed, and a guide plate 14 in a direction parallel to the optical axis is fixed to an inner diameter portion thereof with a screw 14a. Numeral 3 denotes a rectilinear cylinder which is fitted on the outer diameter of the fixed cylinder 1 and a rectilinear guide key 10 fixed on the inner surface of the fixed cylinder 1 engages with the rectilinear guide groove 1a of the fixed cylinder 1 to be parallel to the optical axis. It can be moved only in the direction. Further, a convex cam 3a formed by molding is formed on the inner diameter surface of the rectilinear barrel 3, a male helicoid 3b is formed on the outer peripheral surface thereof, and a cam follower portion 3c is provided on the outer periphery of the rear end portion. Reference numeral 4 denotes a female helicoid ring, with 1 at its front end.
Holding the group barrel 4a, the female helicoid 4b formed on the inner surface of the group barrel engages with the male helicoid 3b of the rectilinear barrel 3,
The rotation is performed for the focus operation. Reference numeral 5 denotes a zoom operation ring which is rotatably held by the fixed cylinder 1 and the mount 2 and has a convex cam portion 5 molded on the inner surface thereof.
a engages with the cam follower portion 3c of the rectilinear barrel 3.

Reference numerals 6 and 8 denote a second-group lens barrel and a fourth-group lens barrel fixed to the front and rear portions of the fixed barrel 1, respectively. Reference numeral 7 denotes a third-group barrel, in which a roller 11 held by a roller shaft 12 is attached by being engaged with a third-group cam 1b of the fixed barrel 1, and an electromagnetic diaphragm device 20 is fixed as an electronic element while an optical axis And a flexible guide portion 7a extending in a direction parallel to. Reference numeral 9 denotes a five-group lens barrel, which is a roller 1 held by a roller shaft 12.
1 is attached to the fixed cylinder 1 in engagement with the fifth group cam 1c. Further, the rollers 11 attached to the third-group barrel 7 and the fifth-group barrel 9 respectively include the convex cam 3a of the straight-moving barrel 3.
When the rectilinear barrel 3 moves in the direction of the optical axis, the third group barrel 7 and the fifth group barrel 9
It rotates and moves along the group cam 1b and the fifth group cam 1c.

A flexible printed wiring board 21 is attached to the electromagnetic diaphragm device 20, and the flexible printed wiring board 21 is fixed to a flexible guide portion 7a of the third lens barrel 7 with a double-sided tape (not shown). Guide plate 1 fixed to the fixed cylinder 1 after being bent into an S-shape
4, and is connected to a connector 15a of a control circuit 15 attached to the fixed cylinder 1.

FIG. 5 is a front view of the arrangement of the bent portion 21a of the flexible printed wiring board 21 at this time, as viewed from the mounting direction. The illustrated position 7a of the flexible guide portion 7a is the initial rotation of the third lens barrel 7. At the wide position, the telephoto position at the rotating end is 7a ', and the printed wiring surface of the flexible printed wiring board 21 arranged at the illustrated position 7a of the flexible guide portion 7a so as to be substantially parallel to the radial direction with respect to the optical axis direction is The guide plate 14 and the guide plate 14 are arranged so as to be opened outward.

The flexible printed wiring board 21 shown in FIG.
In the developed view of FIG. 3, the operation bending portion 21a has a substantially linear shape, and by disposing the operation bending portion 21a in a shape that opens to the outer peripheral side at the initial rotation position of the third lens barrel 7,
Since the outer circumferential length 21b of the operation bending portion 21a needs to be larger than the inner circumferential length 21c, a pulling force always acts on the outer circumferential side, and the third group barrel 7 is moved to the tele side. The operation bending portion 21a can be operated without swinging to the inner peripheral side even when rotated. 7 is a perspective view of the operation bending portion 21a of the flexible printed wiring board 21 at the initial rotation position as viewed from the inner peripheral side, and FIG. 8 is a perspective view as viewed from the inner peripheral side at the rotated position.

Next, the operation of this embodiment having the above configuration will be described. When the zoom position is to be shifted from wide to tele, the zoom operation ring 5 is rotated.
The straight advance cylinder 3 is moved straight by the cam follower portion 3c of the straight advance cylinder 3 engaged with the convex cam portion 5a on the inner diameter surface of the fixed cylinder 1 with the straight advance guide key 10 guided by the straight advance guide groove 1a of the fixed cylinder 1.
At this time, the roller 11 engaged with the convex cam portion 3a on the inner diameter surface of the rectilinear barrel 3
Move to the intersection with the third group cam 1b.

Similarly, the fifth-group barrel 9 moves to the intersection of the convex cam portion 3a of the rectilinear barrel 3 and the fifth-group cam 1c of the fixed barrel 1. Moves along the fifth group cam 1c of the fixed barrel 1, and the zoom operation is completed.
At this time, the flexible printed wiring board 21 of the electromagnetic diaphragm device 20 fixed to the third lens barrel 7 that rotates and moves in the optical axis direction extends between the control circuit 15 and the S-shaped bent portion. Are electrically connected. Since the actuated bent portion 21a of the flexible printed wiring board 21 is arranged so that the pattern surface is substantially parallel to the radial direction from the optical axis center, it has flexibility in both the rotation direction and the optical axis direction. And the third group barrel 7
And a configuration in which the printed wiring surface of the flexible printed wiring board 21 which is disposed substantially parallel to the radial direction with respect to the optical axis direction at the initial rotation wide position has a shape open to the guide plate 14 and the outer peripheral side. Therefore, the transfer amount of the flexible printed wiring board 21 in the inner circumferential direction is also suppressed. FIG. 6 shows the state of the electromagnetic diaphragm device 20 and the flexible printed wiring board 21 at the tele side position.

In this embodiment, a molded zoom lens barrel having a convex cam portion formed by molding is used. However, the electromagnetic diaphragm device 20 connected by the flexible printed wiring board 21 needs to be rotated and extended in the optical axis direction. The zoom configuration is not limited to this. Also, needless to say, the same effect can be obtained by using an electric shutter device instead of the electromagnetic diaphragm device, and also by using a shake correction unit constituting a shake correction device for correcting shake.

[0017]

As described above, according to the first aspect of the present invention, at least a fixed cylinder, a movable group which is rotated and extended in the optical axis direction with respect to the fixed cylinder, and integrally fixed to the movable group. Electrical element, a control unit for controlling the electrical element attached to a fixed unit integral with the fixed cylinder, and a flexible printed wiring connection for connecting the electrical element and the control unit A fixed-side holding member for fixing and holding the flexible printed wiring connection member to the control section substantially in parallel with the optical axis direction of the fixed cylinder, and substantially in a radial direction with respect to the optical axis. A printed wiring surface of the flexible printed wiring connecting member between the fixed side holding member and the electric element arranged in parallel opens outward with respect to the optical axis position at the initial rotation position of the moving group. Adjust the transfer amount to the inner circumference by arranging it in a shape This makes it possible to prevent abnormal noise and malfunction due to contact when other components are present on the outer and inner peripheral sides of the flexible printed wiring connection member. Therefore, the electric element can be integrally attached to the moving group that rotates and extends in the direction of the optical axis, so that a more flexible optical design and a lens barrel design can be realized.

According to a second aspect of the present invention, the flexible printed wiring connecting member is disposed in an S-shape substantially parallel to the optical axis direction of the fixed cylinder by the fixed side holding member.
The flexible printed wiring connection allows operation without stress. According to the third aspect of the present invention, since the movable portion of the flexible printed wiring connection member has a substantially linear shape, the operation bending portion can be more easily assembled. According to the fourth aspect of the present invention, since the fixed side holding member is provided integrally with the fixed cylinder, the number of components can be reduced and the cost can be reduced.

According to a fifth aspect of the present invention, in the movable group to which the electric element is integrally fixed, the fixed-side holding member and the printed wiring surface of the electric element are integrally fixed to the movable group. By providing a movable-side holding member that is held substantially parallel to the optical axis at the intermediate position of the total rotation amount of the electrical element to be held, the movable element and the fixed-side holding member can hold the movable element. Since the movable area of the flexible printed wiring connection member can be limited to a small space, the lens barrel can be further miniaturized by using the moving group configuration of rotating and extending. The present invention described in claim 6 makes it possible to realize a lens barrel having an aperture device capable of rotating and feeding out, because the electric element is an electrical aperture device. According to a seventh aspect of the present invention, a lens barrel in which a part of the configuration of the shake correction device can rotate and extend can be realized by forming a part of the configuration of the shake correction device in which the electric element corrects the shake. to enable.

[Brief description of the drawings]

FIG. 1 is a sectional view of a zoom lens barrel according to an embodiment of the present invention.

FIG. 2 is an exploded perspective view of the main components.

FIG. 3 is a development view of a wide position of a main part constituting part thereof.

FIG. 4 is also a development view of a tele position.

FIG. 5 is a front view as viewed from a mount side.

FIG. 6 is a perspective view of the electromagnetic diaphragm device at the tele position.

FIG. 7 is a perspective view of the flexible printed wiring board at the wide position.

FIG. 8 is a perspective view of the flexible printed wiring board at the telephoto position.

FIG. 9 is a development view of the flexible printed wiring board.

[Explanation of symbols]

1 ··· fixed cylinder, 1a · · · straight groove is id groove, 1b · · · 3 group cam, 1c · · · 5 group cam, 2 · · · mount, 3 · · · · straight barrel, 3a · · · convex cam portion, 3b · · · male Helicoid, 3c
..Cam follower section, 4 · Female helicoid ring, 4a ·
1st lens barrel, 4b female helicoid, 5 zoom operating ring, 5a convex cam section, 6 second lens barrel, 7 third lens barrel, 7a flexible guide section, 8 ..Group 4 lens barrel, 9
・ 5 group lens barrel, 10 ・ ・ Straight guide key, 11 ・ ・ Coro,
12. Roller shaft, 13 screw, 14 guide plate, 1
4a screw, 15 control circuit, 15a connector section, 20 electromagnetic diaphragm device, 21 flexible printed wiring board, 21a operating bending portion, 21b outer circumferential circumference, 21c・ Inner circumference.

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Tatsuya Sato 3-30-2 Shimomaruko, Ota-ku, Tokyo Inside Canon Inc.

Claims (7)

[Claims] At least a fixed cylinder, a moving group that rotates and moves in the direction of the optical axis with respect to the fixed cylinder, an electric element that is integrally fixed to the moving group, and a fixing unit that is integrated with the fixed cylinder. A control unit for controlling the electric element attached to the control unit; a flexible printed wiring connection member for connecting the electric element to the control unit; and a control unit for connecting the flexible printed wiring connection member to the control unit. A fixed-side holding member for fixing and holding substantially parallel to the optical axis direction of the fixed cylinder, and the fixed-side holding member and the electric element arranged substantially parallel to the radial direction with respect to the optical axis. Wherein the printed wiring surface of the flexible printed wiring connecting member is disposed so as to open outward with respect to the optical axis position at the initial rotation position of the moving group. Connection structure. 2. The flexible printed wiring connection member according to claim 1, wherein said fixed-side holding member is disposed in an S-shape substantially parallel to the optical axis direction of said fixed cylinder. Electrical connection structure of lens barrel. 3. An electrical connection structure for a lens barrel according to claim 1, wherein the movable portion of said flexible printed wiring connection member has a substantially linear shape. 4. The electrical connection structure for a lens barrel according to claim 1, wherein said fixed side holding member is provided integrally with said fixed barrel. 5. The moving group to which the electric element is integrally fixed, the fixed-side holding member and the printed wiring surface of the electric element being the total of the electric element to be integrally fixed to the moving group. 5. The electrical connection of the lens barrel according to claim 1, further comprising a movable holding member that holds the optical axis at a substantially intermediate position of the rotation amount so as to be parallel to the radiation direction. Construction. 6. An electrical connection structure for a lens barrel according to claim 1, wherein said electric element is an electric diaphragm device. 7. The apparatus according to claim 1, wherein said electric element is a part of a configuration of a shake correction device for correcting shake.
3. The electrical connection structure of the lens barrel according to 3, 4, or 5.