JP4795508B2 - Lens tube electrical connection structure - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an electrical connection structure of a lens barrel having an electrical aperture device integrally attached to a moving lens group that is extended.
[0002]
[Prior art]
In general, an electrical aperture device or an electrical 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 the cable, there is known a method in which a slack is provided in the lens barrel and the connection is made by a lead wire or a flexible printed wiring board.
[0003]
On the other hand, a movable member such as an operating ring that moves for focusing or zooming and a fixed cylinder, like a lens barrel wiring device described in Japanese Utility Model Publication No. 59-128609, are formed into a belt-like flexible print. The wiring board may be connected by folding the middle part along the moving direction of the operation ring, or the electric diaphragm device and the fixed part moving in the optical axis direction as described in Japanese Utility Model Publication No. 6-37371. It is also known that a flexible printed wiring board is arranged in a spiral band along the inner diameter portion of the fixed cylinder, and can be connected by elastically bending.
[0004]
[Problems to be solved by the invention]
However, in the method of connecting with a lead wire or flexible printed wiring board with slack in the lens barrel, the lead wire or flexible printed wiring board at the time of slackening interferes with other moving lens groups or places in the fixed tube. It is necessary to provide a wide space so as not to cause stress or disconnection, and it is inappropriate for downsizing the lens barrel itself. Further, the method of folding the intermediate part has a problem in durability that the folded part is easily damaged when it is repeatedly moved. In the method of arranging the flexible printed wiring board in a spiral band, a space in the circumferential direction is required so that the flexible printed wiring board can be spirally arranged in the fixed cylinder, and when the flexible printed wiring board expanded in a spiral shape is manufactured. There is also a problem that the area of the device becomes large and costs increase.
[0005]
The present invention eliminates the drawbacks of the above-described conventional example, and includes an electric diaphragm device or an electric shutter device 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. An object of the present invention is to provide an electrical connection structure of a lens barrel that does not take more space and cost than is necessary to electrically connect an electrical device and a control unit arranged in a fixed part with a flexible printed wiring board. To do.
[0006]
[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. A printed wiring surface is disposed substantially perpendicular to the radial direction with respect to the optical axis of the fixed tube, and a flexible printed wiring connecting member is disposed between the control unit and the fixed member. The guide member is arranged so as not to contact other parts. Further, the flexible printed wiring connecting member is arranged in an S shape substantially perpendicular to the optical axis direction of the fixed cylinder by the fixed side holding member, and fixed to the moving group to which the electric device is fixed integrally. A movable side holding member for holding the flexible printed wiring connection member was provided substantially parallel to the optical axis direction of the cylinder.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
The present invention is attached to a fixed cylinder, a moving group that extends in an optical axis direction with respect to the fixed cylinder, an electric device that is integrally fixed to the moving group, and a fixed portion that is integral with the fixed cylinder. A control unit for controlling the electric device, a flexible printed wiring connecting member for connecting the electric device and the control unit, and the flexible printed wiring connecting member to the control unit. A movable group side holding member for fixing and holding substantially parallel to the optical axis direction of the fixed cylinder, and the flexible printed wiring connecting member for holding the control section substantially parallel to the optical axis direction of the fixed cylinder The flexible printed wiring member has a printed wiring surface disposed substantially perpendicular to the radial direction with respect to the optical axis of the fixed cylinder, and the flexible printed wiring connecting member is provided with the flexible printed wiring connecting member. The electric device and the fixing portion are arranged between the control portion and the fixing member. Can be accommodated at least outside a cylindrical member such as a fixed cylinder, and the flexible printed wiring board can be connected to other moving lens groups or locations in the fixed cylinder. It is no longer necessary to provide a large space so that stress or disconnection does not occur due to interference with the lens, and thus the outer diameter of the lens barrel can be reduced.
[0008]
Further, according to the present invention, the flexible printed wiring connection member is arranged in an S shape substantially perpendicular to the optical axis direction of the fixed cylinder by the fixed side holding member. Enables operation without stress.
[0009]
【Example】
An embodiment of the present invention will be described below with reference to FIGS.
[0010]
FIG. 1 shows an embodiment in which the present invention is applied to a zoom lens barrel. The upper half shows a wide position and the lower half shows a tele position. FIG. 2 is a perspective view of the main components.
[0011]
In the figure, reference numeral 1 denotes a lens mirror chamber which is integrally fixed to the front portion of the front 2 and moves straight in the optical axis direction by the rotation of the zoom ring 7 and the rectilinear groove of the first rectilinear cylinder 5. The first rectilinear cylinder 5 moves straight in the optical axis direction by rotation of the key (not shown), the rectilinear groove of the fixed cylinder 4 and the zoom ring 7. Reference numerals 2 and 8 in the figure denote lens moving frames that move in the optical axis direction by the fixed cylinder 4 and the cam cylinder 3. Reference numerals 13 and 17 in the figure denote lens movement frames, which are moved in the optical axis direction by the cam barrel 3, the second rectilinear barrel 9, and the rotary barrel 16.
[0012]
The lens moving frame 13 has an electromagnetic diaphragm mechanism 10 attached thereto, and is electrically connected to a control board 24 having a CPU and the like for controlling the electromagnetic diaphragm mechanism 10 by a flexible printed wiring board 15. ing. The control board 24 is integrally attached to the holding cylinder 21 via the holding plate 22.
[0013]
A movable group side holding plate 14 for fixing and holding the flexible printed wiring board 15 to the control board 24 substantially in parallel with the optical axis direction of the fixed cylinder 4 is integrally attached to the lens moving frame 13. ing.
[0014]
The holding cylinder 21 is fixed integrally with the fixed cylinder 4, and the cover ring 12 is sandwiched and attached between the holding cylinder 21 and the rear cylinder 23. A mount 25 is integrally attached to the rear cylinder 23. A flexible printed wiring board 15 is sandwiched between the holding cylinder 21 by a fixed holding board 20 for holding the flexible printed wiring board 15 with respect to the control board 24 substantially in parallel with the optical axis direction of the fixed cylinder 4. The cam cylinder 3 is rotated in the optical axis direction by the fixed cylinder 4 and the first rectilinear cylinder 5.
[0015]
Next, the operation of this embodiment having the above configuration will be described.
[0016]
When trying to shift the zoom position from wide to tele, when the zoom ring 7 is rotated, the cam roller screwed to the first straight cylinder 5 engaged with the cam portion of the zoom ring 7 The first rectilinear cylinder 5 is linearly moved in the optical axis direction with a rectilinear guide key guided in the rectilinear guide groove of the fixed cylinder 4.
[0017]
At this time, the cam cylinder 3 is rotated in the optical axis direction by the cam roller engaged with the cam portion of the first rectilinear cylinder 5 and the cam portion of the fixed cylinder 4 and screwed to the cam cylinder 3.
[0018]
When the cam cylinder 3 rotates, the second rectilinear cylinder 9 is moved in the optical axis direction by a roller fastened to the second rectilinear cylinder 9 engaged with the rotation groove of the cam cylinder 3 and the rectilinear groove of the second rectilinear cylinder 9. Go straight to.
[0019]
Further, the moving frames 13, 17 move straight in the optical axis direction by the rectilinear groove of the second rectilinear cylinder 9 and the cam portion of the cam cylinder 3. This completes the zoom operation.
[0020]
At this time, the flexible printed wiring board 15 of the electromagnetic diaphragm mechanism 10 fixed to the lens moving frame 13 that moves forward in the direction of the optical axis moves along the fixed-side holding member 20 at a portion bent in an S shape. The control board 24 is electrically connected while extending. Since this S-shaped bent portion is accommodated between the control board 24 and the holding cylinder 21 and is guided and extended by the fixed-side holding member 20, there is no need for extra space in the lens barrel. As a result, the outer diameter of the lens barrel can be reduced.
[0021]
In this embodiment, the present invention is applied to an interchangeable lens type zoom lens barrel, but it can also be applied to a zoom lens of a compact camera. Needless to say, the present invention is not limited to the electromagnetic diaphragm mechanism, and the same effect can naturally be obtained even with an electric shutter mechanism device or other electrical device.
[0022]
【The invention's effect】
As described above, the present invention includes a fixed tube, a moving group that moves out in the optical axis direction with respect to the fixed tube, an electric device that is integrally fixed to the moving group, and a fixed portion that is integrated with the fixed tube. A control unit for controlling the electric device attached to the control unit, a flexible printed wiring connecting member for connecting the electric device and the control unit, and the flexible printed wiring connecting member with respect to the control unit. A movable group side holding member for fixing and holding substantially parallel to the optical axis direction; and a fixed side holding member for holding the flexible printed wiring connection member substantially parallel to the optical axis direction of the fixed cylinder with respect to the control unit; The flexible printed wiring member has a printed wiring surface disposed substantially perpendicular to the radial direction with respect to the optical axis of the fixed cylinder, and the flexible printed wiring connecting member is disposed between the control unit and the fixed member. Storage of flexible printed wiring members by arranging This space is not provided in the lens barrel, but can be stored in other places, so that the inner diameter of the lens barrel can be reduced, and consequently the outer diameter of the optical device can be reduced. Can do.
[Brief description of the drawings]
FIG. 1 is a sectional view showing an embodiment of a lens barrel according to the present invention.
FIG. 2 is a perspective view showing an embodiment of a main component according to the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Lens mirror chamber 2 Lens moving frame 3 Cam cylinder 4 Fixed cylinder 5 First rectilinear cylinder 6 Front 7 Zoom ring 8 Lens moving frame 9 Second rectilinear cylinder 10 Electromagnetic diaphragm mechanism 12 Cover ring 13 Lens moving frame 14 Moving group side Holding plate 15 Printed wiring contact plate 16 Rotating cylinder 17 Lens moving frame 20 Fixed side holding plate 21 Holding cylinder 22 Holding plate 23 Rear cylinder 24 Control board 25 Mount

Claims (3)

A rear cylinder provided with a mount, and
A holding cylinder which is fixed to said rear cylinder,
A fixed cylinder which is integrally secured to the opposite side of the mounting portion of the holding cylinder,
A lens moving frame is moved in the optical axis direction with respect to the fixed tube,
Holding the lens moving frame, a rectilinear tube which moves in the optical axis direction along with the movement,
In the lens barrel and a cam cylinder for movably holding the optical axis direction in accordance with rotation of said straight barrel,
Disposed in the lens moving frame, and an electric device that moves in the same direction as the lens movement frame with the movement of the lens moving frame,
Disposed in the holding cylinder, and a control unit for controlling the electric device,
Connecting the electrical device and said controller electrically, and a flexible printed circuit connecting member that will be contained or expanded according to the movement of the optical axis of the electric device,
A moving group side holding member that is integrally provided with the lens moving frame and is substantially parallel to the optical axis direction, and holds the flexible printed wiring connecting member substantially parallel to the optical axis direction of the lens barrel ;
To be substantially parallel to the fixed direction of the optical axis in the holding cylinder, the flexible printed circuit connecting member lenses in the lens barrel having a fixed side holding member for holding substantially parallel to the optical axis of the lens barrel An electrical connection structure of a lens barrel,
The flexible printed wiring connecting member is
When the electric device moves to the mount portion side, it bends in the radial direction of the lens barrel along the fixed-side holding member, contacts the inner wall of the rear tube, and further bends to the opposite side of the mount portion. Then, it extends in the optical axis direction along the inner wall of the rear tube, and gently bends by contacting the rear end of the holding tube, then turns back to the mount portion, and then gently turns back again to oppose the mount portion. Extending to the side and housed in a gap formed by the rear tube, the holding tube and the control unit,
When the electric device moves to the opposite side of the mount portion, it bends in the radial direction of the lens barrel along the fixed-side holding member, and does not come into contact with the inner wall of the rear tube or the holding tube. An electrical connection structure for a lens barrel, wherein the lens barrel is folded back and gently folded, extended to the opposite side of the mount, and deployed . 2. The lens barrel electrical connection structure according to claim 1, wherein the electrical device is an electrical aperture device. 2. The lens barrel electrical connection structure according to claim 1, wherein the electrical device is an electrical shutter device.

Images