JP3976872B2 - Lens barrel - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a lens barrel having an electric device such as an electric diaphragm device that is integrally attached to a moving lens group that rotates and extends.
[0002]
[Prior art]
Conventionally, an electric aperture device or an electric shutter device that is integrally attached to a moving group that moves in the optical axis direction for focusing or zooming with respect to a fixed cylinder, and a control unit disposed in the fixed portion are electrically connected. As a means for connecting to a cable, a connection means (conventional example 1) using a lead wire or a flexible printed wiring board with a slack is generally known.
Further, like a lens barrel wiring device described in Japanese Utility Model Laid-Open No. 59-128609, a movable member such as an operating ring that moves for focusing or zooming and a fixed cylinder are formed into a belt-like flexible printed wiring board. Is also known (conventional example 2) in which the intermediate part is folded and connected along the moving direction of the operation ring.
Furthermore, the flexible printed wiring board is arranged in a spiral band with an electric diaphragm device moving in the direction of the optical axis described in Japanese Utility Model Publication No. 6-37371 and a fixed portion along the inner diameter portion of the fixed cylinder. Also known is the one that can be connected by being bent in a straight line (conventional example 3).
[0003]
[Problems to be solved by the invention]
However, in the above-described conventional example 1, it is necessary to provide a wide space so that the lead wire and the flexible printed wiring board in contact with other moving lens groups and other members in the fixed cylinder do not cause stress or disconnection, etc. Therefore, the lens barrel itself was inappropriate for downsizing.
Further, not only correspond to the case above conventional example 2, the movable member moves linearly in the optical axis direction with respect to the fixed cylinder, it is possible to use if the electric throttle device is fixed to the movable group of rotating pay-out could not.
Further, in the above-described conventional example 3, a space in the circumferential direction is required so that the flexible printed wiring board can be spirally arranged in the fixed cylinder, and the flexible printed wiring board in which the spiral is developed has a large area for manufacturing. There was also a problem that it was expensive.
[0004]
The present invention eliminates the disadvantages of the prior art described above, and provides an electric diaphragm device or an electric shutter device or the like that is integrally attached to a moving group that rotates in the optical axis direction for focusing or zooming with respect to the fixed cylinder. It is an object of the present invention to provide a lens barrel that does not require more space or cost than is necessary for electrically connecting the apparatus and a control unit arranged in a fixed unit with a flexible printed wiring board.
[0005]
[Means for Solving the Problems]
In order to achieve the above-mentioned object, the present invention provides a flexible printed wiring connecting member for connecting a control unit attached to a fixed cylinder and an electric device provided in a moving group moved in the optical axis direction with respect to the fixed cylinder. The printed wiring surface is arranged in a direction along a radial plane parallel to the optical axis of the fixed cylinder and toward the axial center of the optical axis .
[0006]
BEST MODE FOR CARRYING OUT THE INVENTION
The present invention provides a movement that moves between a fixed cylinder and a second position that is disposed in the fixed cylinder and that is rotated and extended from the first position in the optical axis direction with respect to the fixed cylinder. A lens barrel, an electric device integrally fixed to the movable lens barrel, a control unit for controlling the electric device attached to a fixed part integral with the fixed tube, and connected to the control unit Flexible having a fixed tube side extending portion, a movable tube side extending portion connected to the electric device, and an S-shaped bent portion connecting the fixed tube side extending portion and the moving tube side extending portion. A flexible printed wiring connecting member and a flexible printed wiring arranged in a direction parallel to the optical axis of the fixed cylinder and in a radial direction toward the axial center of the optical axis, and fixed to the fixed cylinder. A fixed-side holding member that holds the fixed-tube extending portion of the connection member, and an optical axis of the movable barrel A movement that is arranged in a row and along a radial direction toward the axis center of the optical axis, is fixed to the movable barrel, and holds the movable barrel-side extending portion of the flexible printed wiring connection member A side holding member, wherein the flexible printed wiring connecting member has a printed wiring surface parallel to the optical axis of the fixed cylinder and the optical axis of the flexible printed wiring connecting member. The S-shaped bent portion is disposed in a direction along a radial surface toward the axis center, and the S-shaped bent portion moves in the optical axis direction of the fixed tube in the movement between the first position and the second position of the movable barrel. And by deforming in the circumferential direction , the flexible printed wiring connecting member can be moved both in the optical axis direction and in the circumferential direction when the electric device and the fixed portion are electrically connected.
[0007]
Further, according to the present invention, since the electric device is an electric throttle device, an electric throttle device capable of rotating and feeding can be realized, and a design with a higher degree of freedom is possible. Further, according to the present invention, since the electric device is an electric shutter device, an electric shutter device capable of rotating and feeding can be used, and a design with a higher degree of freedom is possible.
[0008]
【Example】
An embodiment of the present invention will be described below with reference to FIGS.
1 is a zoom lens barrel of the present embodiment, the upper half portion is in a wide position state, the lower half portion is in a tele position state, FIG. 2 is a perspective view of the main components, FIG. 4 is a development view of the tele position, FIG. 5 is a front view of the wide position as viewed from the mount side, and FIG. 6 is a front view of the tele position.
In the figure, reference numeral 1 denotes a fixed cylinder, which is integrally fixed to the front portion of the mount 2, and has a rectilinear guide groove 1a, a third group cam 1b and a fifth group cam 1c formed on its peripheral surface. A guide plate 14 parallel to the shaft is fixed with screws 14a. Reference numeral 3 denotes a rectilinear cylinder, which is fitted to the outer diameter portion of the fixed cylinder 1, and a rectilinear guide key 10 fixed to the inner diameter surface thereof engages with the rectilinear guide groove 1a of the fixed cylinder 1 to be parallel to the optical axis. It can only move in the direction. Further, a convex cam 3a molded on the inner diameter surface of the straight cylinder 3 is formed, 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, which holds the first group lens barrel 4a at the front end thereof, and a female helicoid 4b formed on the inner surface of the ring engages with the male helicoid 3b of the rectilinear cylinder 3 and is rotated out for focusing. The A zoom operation ring 5 is rotatably held by the fixed cylinder 1 and the mount 2, and a convex cam portion 5 a molded on the inner diameter surface thereof is engaged with the cam follower portion 3 c of the rectilinear cylinder 3.
[0009]
Next, reference numerals 6 and 8 denote a second group barrel and a fourth group barrel fixed to the front portion and the rear portion of the fixed barrel 1, respectively.
Reference numeral 7 denotes a third group lens barrel. The roller 11 held by the roller shaft 12 is attached to be engaged with the third group cam 1b of the fixed cylinder 1, and the electromagnetic diaphragm device 20 is fixed and parallel to the optical axis. A flexible guide portion 7a extending in the direction is provided. Reference numeral 9 denotes a fifth group barrel, and a roller 11 held by a roller shaft 12 is attached to be engaged with a fifth group cam 1c of the fixed barrel 1. Further, the rollers 11 respectively attached to the third group barrel 7 and the fifth group barrel 9 are engaged with the convex cams 3a of the rectilinear barrel 3, so that the rectilinear barrel 3 moves in the optical axis direction. The third group barrel 7 and the fifth group barrel 9 rotate and move along the third group cam 1b and the fifth group cam 1c of the fixed barrel 1.
[0010]
The electromagnetic diaphragm device 20 is electrically connected to the distal end, which is one end of the movable barrel side extending portion of the flexible printed wiring board 21, and the movable barrel side extending portion of the flexible printed wiring board 21 is the third group barrel. 7 is fixed to a flexible guide portion 7a which is a moving side holding member with a double-sided tape (not shown). The other end of the movable barrel-side extending portion of the flexible printed wiring board 21 is bent into an S shape as an S-shaped bent portion, and further, a fixed cylinder-side extending portion is formed. The fixed cylinder side extending portion of the flexible printed wiring board 21 is fixed to a guide plate 14 which is a fixed side holding member fixed to the fixed cylinder 1 with a double-sided tape (not shown) or the like. The distal end of the extension portion on the fixed cylinder side of the flexible printed wiring board 21 is electrically connected to the connector portion 15 a of the control circuit 15 attached to the fixed cylinder 1. Here, as is apparent from FIGS. 2 and 3, the printed wiring surface of the flexible printed wiring board 21 is parallel to the optical axis of the fixed cylinder 1 and extends along a radial surface toward the axial center of the optical axis. Arranged in the direction .
[0011]
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, when the zoom operation ring 5 is rotated, the rectilinear cylinder is caused by the cam follower portion 3c of the rectilinear cylinder 3 engaged with the convex cam portion 5a on the inner diameter surface of the zoom operation ring 5. 3, the linear guide key 10 is guided in the linear guide groove 1 a of the fixed cylinder 1 and moves linearly. At this time, the roller 11 engaged with the convex cam portion 3 a on the inner diameter surface of the straight cylinder 3 moves to the intersection of the convex cam portion 3 a of the straight cylinder 3 and the third group cam 1 b of the fixed cylinder 1. The third group barrel 7 holding the roller 11 moves along the third group cam 1b of the fixed barrel 1 .
[0012]
Similarly, since the fifth group barrel 9 also 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, the fifth group barrel 9 holding the roller 11 is fixed. It moves along the fifth group cam 1c of the tube 1 to complete the zoom operation. At this time, the flexible printed wiring board 21 of the electromagnetic diaphragm device 20 fixed to the third group barrel 7 that rotates and moves in the direction of the optical axis extends from the control circuit 15 while extending the bent portion in an S shape. Will be electrically connected. Since the printed wiring surface of the flexible printed wiring board 21 is arranged in a direction parallel to the optical axis of the fixed cylinder 1 and along the radial surface toward the axial center of the optical axis, The portion bent in an S shape has flexibility both in the rotation direction and in the optical axis direction.
[0013]
In this embodiment, a mold zoom lens barrel having a convex cam portion formed by molding is used. However, in the zoom configuration in which the electromagnetic diaphragm device 20 connected by the flexible printed wiring board 21 requires rotation out toward the optical axis direction. If there is, it is not limited to this. Needless to say, the same effect can be obtained by using an electric shutter device or other electric device instead of the electromagnetic diaphragm device.
[0014]
【The invention's effect】
As described above , according to the present invention, since the flexible printed wiring connecting member can be moved in the optical axis direction and the circumferential direction in a space-saving manner, the light can be used for focusing or zooming with respect to the fixed cylinder. The electric device can be integrally attached to the moving group that rotates in the axial direction, so that optical design and lens barrel design with higher degrees of freedom are possible.
[0015]
In addition, the present invention makes it possible to realize a lens barrel having an electrical aperture device capable of rotating and rotating, since the electrical device is an electrical aperture device. Furthermore, the present invention makes it possible to realize a lens barrel having an electrical shutter device capable of rotating and feeding, since the electrical device is an electrical shutter device.
[Brief description of the drawings]
FIG. 1 is a cross-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 wide position development view of the main components.
FIG. 4 is also a tele position development view.
FIG. 5 is a front view of a wide position as viewed from the mount side.
FIG. 6 is a front view of the tele position as seen from the mount side.
[Explanation of symbols]
1 ··· Fixed tube, 1a ··· Straight guide groove, 1b ··· 3 group cam, 1c · · 5 group cam, 2 · · Mount, 3 · · Straight tube, 3a · · Convex cam part, 3b · · Male helicoid 3c ··· Cam follower section, 4 ·· Female helicoid ring, 4a ·· 1 group lens barrel, 4b ·· Female helicoid, 5 ·· Zoom operation ring, 5a ·· Convex cam portion, 6 ·· 2 group lens barrel, 7 ·· 3 group barrel, 7a ·· Flexible guide section, 8 ·· 4 group barrel, 9 ·· 5 group barrel, 10 ·· Straight guide key, 11 ·· roller, 12 ·· roller shaft, 13 .. Screw, 14 .. Guide plate, 14 a .. Screw, 15 .. Control circuit, 15 a .. Connector part, 20 .. Electromagnetic diaphragm device, 21 .. Flexible printed wiring board.

Claims (3)

A fixed cylinder;
A movable lens barrel disposed within the fixed cylinder and moving between a first position with respect to the fixed cylinder and a second position rotated and extended from the first position in the optical axis direction ;
An electric device integrally fixed to the movable barrel ;
A controller for controlling the electric device attached to a fixed part integral with the fixed cylinder;
An S-shaped connecting portion connecting the fixed tube side extending portion connected to the control unit, the moving tube side extending portion connected to the electric device, and the fixed tube side extending portion and the moving tube side extending portion. A flexible printed wiring connecting member having a bent portion ;
Arranged in a direction parallel to the optical axis of the fixed cylinder and along a radial surface toward the axial center of the optical axis and fixed to the fixed cylinder, the fixed printed wiring connecting member on the fixed cylinder side A fixed-side holding member that holds the extending portion;
The movement of the flexible printed wiring connection member is arranged in a direction parallel to the optical axis of the movable barrel and along a radial plane toward the axial center of the optical axis and fixed to the movable barrel. A movable side holding member that holds the lens barrel side extending portion ,
The flexible printed wiring connecting member has a surface in a radial direction in which a printed wiring surface of the flexible printed wiring connecting member is parallel to the optical axis of the fixed tube and toward the axial center of the optical axis. The S-shaped bent portion is deformed in the optical axis direction and the circumferential direction of the fixed barrel when the movable barrel is moved between the first position and the second position. A featured lens barrel.   The lens barrel according to claim 1, wherein the electric device is an electric aperture device.   The lens barrel according to claim 1, wherein the electric device is an electric shutter device.

Images