JPH11133288A - Lens barrel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain much folding amount without requiring much space in the radial direction of a lens barrel. SOLUTION: This lens barrel is provided with a cylindrical member 30 holding a photographing lens, a first electric device housed inside the member 30 and moving in an optical axis direction, a second electric device fixed and housed inside a camera main body, and a flexible wiring member 10 connecting the first and second electric devices, and folded and housed inside the member 30 prepared, for the movement of the first electric device. The member 10 has plural folding parts 100 and 101, and the parts 100 and 101 are arranged side by side in the peripheral direction of the member 30 or in an optical axis direction.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lens barrel, and more particularly, to a flexible print for connecting a shutter or aperture driving device of a camera in which the lens barrel advances and retreats in an optical axis direction, and a control device disposed in the camera body. The present invention relates to a lens barrel characterized by storing a substrate.

[0002]

2. Description of the Related Art When a lens barrel is in a collapsed state, a slack portion occurs on a flexible printed circuit board that connects a shutter or aperture driving device of a camera to a control device disposed in a camera body. This slack portion is stored by being folded in the lens barrel. Conventionally, this folding method is repeated a plurality of times in the direction perpendicular to the lens optical axis (radial direction of the lens barrel) in the lens barrel.

[0003]

In the prior art as described above, if the layers are stacked a plurality of times in a direction perpendicular to the optical axis of the lens, a storage space is required in the radial direction of the lens barrel.
There is a disadvantage that the lens barrel diameter becomes large.

The present invention has been made in view of the above problems, and has as its object to increase the amount of folding without requiring a large space in the radial direction of the lens barrel.

[0005]

In order to achieve this object, a lens barrel according to the present invention is provided with a cylindrical member (30) for holding a photographing lens, and is housed in the cylindrical member and moves in the optical axis direction. A first electric device (61), a second electric device (81) fixedly housed in the camera body, a first electric device and a second electric device.
A flexible wiring member (10) that is connected to the electrical device and folded and stored in a cylindrical member in preparation for movement of the first electrical device, wherein the flexible wiring member includes a plurality of folded portions (100, 101). The plurality of folded portions are configured to be arranged in the circumferential direction of the cylindrical member or in the optical axis direction.

[0006]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a sectional view of a lens barrel provided with a flexible printed circuit board for driving a lens shutter according to the present invention. FIG. 2 is a horizontal sectional view of a lens barrel provided with the flexible printed circuit board of the present invention. 3 to 5
FIG. 4 is a cross-sectional view of the zoom lens barrel when wide. 6 to 8 are cross-sectional views of the zoom lens barrel at the time of middle. 9 to 11 are cross-sectional views of the zoom lens barrel during telephoto.

In FIG. 1, reference numeral 10 denotes a flexible printed circuit board, 20 denotes a straight-moving cylinder, 30 denotes a cam cylinder, and 40 denotes a fixed cylinder. Reference numerals 20a and 20b denote flat portions provided on the outer periphery of the rectilinear guide tube 20 for housing the flexible printed circuit board 10. 22a and 22b are cam cylinders 30
And the space formed between the flat portions 20a and 20b.
20c, 20d, 20e, 20f, 20g, and 20
h indicates a straight guide groove provided in the straight guide cylinder 20 for moving each lens group in the optical axis direction. Reference numeral 30a denotes a gear provided on the outer periphery for rotating the cam barrel 30 around the optical axis. Reference numerals 40a, 40b, and 40c denote cam grooves provided in the fixed barrel 40 for moving the rectilinear guide barrel 20 in the optical axis direction with the rotation of the cam barrel 30. 40d, 40e and 40f are fixed cylinders 40 so that the linear guide cylinder 20 restricts rotation around the optical axis.
It is a straight groove provided in.

In FIG. 2, reference numerals 10a and 10b denote folded portions of the flexible printed circuit board 10. 20
k and 20h indicate holes for sending the flexible printed circuit board 10 into the spaces 22a and 22b and storing them. Reference numerals 100 and 101 denote clips for fixing the flexible printed circuit board 10 to the straight guide cylinder 20 when the flexible printed circuit board 10 is bent at the holes 20k and 20h.

In FIG. 3, reference numeral 20j denotes a projection. The protrusion 20j engages with a groove 30j provided in the cam cylinder 30 in order to integrally advance and retreat the linear guide cylinder 20 and the cam cylinder 30 in the optical axis direction. Reference numeral 31 denotes a floor pin attached to advance and retreat the linear guide tube 20 along the optical axis along with the rotation of the cam tube 30, and engages with a cam groove 40a provided in the fixed tube 40. Reference numeral 60 denotes a second group lens fixed to the shutter driving unit 61, and the shutter driving unit 61 is fixed by a second group frame 62. 70 is
3 shows a third group lens fixed from a third group cylinder 71.

Reference numeral 80 denotes a printed circuit board on which a control circuit including a CPU 81 is mounted. Reference numeral 81 denotes a CPU that controls the shutter driving unit 61. Reference numeral 90 denotes a camera body. Reference numeral 110 denotes a reduction gear train for transmitting the rotational force of the lens barrel drive motor 111. 120 and 12
Reference numeral 1 denotes a light-shielding curtain for preventing light leakage. 13
0 indicates an outer cover of the camera body. 140 is the dark box 4
0 and the space of the camera body 90 are shown. Reference numeral 150 denotes a space between the rectilinear guide cylinder 20 and the second group frame 62. 200 indicates a film surface.

In FIG. 4, reference numeral 72 denotes a third group lens frame 71.
Shows a follower pin attached to advance and retract the cam groove 30b1 in the optical axis direction.
30b3 and the straight guide grooves 20C1 to 20C3. In FIG. 5, reference numeral 52 denotes a follower pin provided for moving the first group frame 51 forward and backward in the optical axis direction, and engages with the cam grooves 30d1 to 30d3 and the straight guide grooves 20c1 to 20c3 including two not shown. . Reference numeral 63 denotes a follower pin provided for moving the second group frame 62 in the optical axis direction, and includes cam grooves 30c1 to 30c including the other two not shown.
c3 engages with the straight guide grooves 20d1 to 20d3. FIG.
To FIG. 8 and FIG. 9 to FIG.
Same as above. The flexible printed board 10
Both folding sections 200 and 300 correspond to zooming of the lens barrel.

A gear 30 provided on the outer peripheral portion of the cam cylinder 30
a meshes with the gear 110 outside the dark box 40. The gear 30a transmits a driving force generated from the lens barrel drive motor 111 to drive the lens barrel. A follower pin 31 is fixed to the outer periphery of the cam cylinder 30. The pin 31 engages with a cam groove 40 a provided on the inner wall of the dark box 40, and moves in the optical axis direction with the rotation of the cam cylinder 30. A cam groove 30c for moving each lens group along the optical axis during zooming is provided on the inner wall of the cam barrel 30.
1, 30c2, 30d, 30e1, 30e2, 30f,
30g1, 30g2, and 30h are provided.
The gear 30a is provided in a circumferential direction of an outer peripheral portion of the cam cylinder 30 in order to rotate the cam cylinder 30 around the optical axis.

A projection 20 provided on the straight guide cylinder 20
j engages with the groove 30j of the cam cylinder 30 because the linear guide cylinder 20 advances and retreats in the optical axis direction integrally with the cam cylinder 30. A follower pin 52 is fixed on the outer circumference of the first group cylinder 51, and this pin 52 is engaged with both the straight guide groove 20c of the straight guide cylinder 20 and the cam groove 30c1 of the cam cylinder 30. The cylinder 51 is driven. 2nd cylinder 6
2, a follower pin 63 is fixed on the outer periphery,
This pin 63 is used as the linear guide groove 20c of the linear guide cylinder 20.
And the cam groove 30c2 of the cam cylinder 30, and drives the second group cylinder 62. A follower pin 72 is fixed on the outer circumference of the third group cylinder 71. This pin 72
Are engaged with both the linear guide groove 20f of the linear guide cylinder 20 and the cam groove 30f of the cam cylinder 30.
Is driven. The follower pins 31, 52, 63, and 72 are provided three in total at every 120 degrees on the circumference, and the other two pins are driven in the same manner as to advance and retreat in the optical axis direction of the lens barrel.

The dark box 40 is connected to the camera body 9 with screws (not shown).
It is fixed to 0. On the printed circuit board 80, a shutter control CPU 81 is provided. The flexible printed circuit board 10 is connected to the shutter control CPU 81, advances from the space 140 between the camera body 90 and the dark box 40, passes through the space 150 between the rectilinear guide cylinder 20 and the second group cylinder 62, along the optical axis direction, and is folded. To form a first folded portion (see FIGS. 12 and 13). After that, it is fed to the space between the straight guide tube 20 and the cam tube 30 by the hole 20g provided in the straight guide tube 20. When bent, the flexible printed circuit board 10 is fixed to the straight guide tube 20 by the clip 100. Cam cylinder 3
A part of the outer diameter of the straight guide cylinder 20 in contact with the inner diameter of 0
A flat portion 20a for accommodating the flexible printed circuit board 10 is provided, and is sent to a space 22a created by a step between the inside of the cam cylinder 30 and the step 20a.

The flexible printed circuit board 10 sent to the space 22a is turned around along the outer diameter of the straight guide tube 20, and sent to the space 22b formed by the step 20b and the inside of the cam tube 30, and then the straight guide tube. The rectilinear guide cylinder 20 and the second group cylinder 62 are again inserted through the hole 20h provided in the space 20.
To the space 151. When folded here,
The flexible printed circuit board 10 is fixed to the straight guide cylinder 20 with a clip 101. Flexible printed circuit board 1 turned along the inner diameter of straight guide cylinder 20
0 is sent to the film surface 200 side of the camera, is folded at the folding portion 10b, passes again through the side surface of the second group cylinder 62, forms a second folding portion, and forms the shutter driving portion 6
Connected to 1.

According to the present invention, the flexible printed circuit board 10 can be folded by the folds 10a and 10b when a long flexible printed circuit is required for a lens barrel having a large zoom ratio or a lens barrel having a small diameter. The lens barrel can be housed without any need, and the size of the lens barrel can be reduced.

[0018]

As described above, according to the lens barrel of the present invention, the plurality of folded portions are arranged in the circumferential direction of the cylindrical member or in the optical axis direction.
Without requiring much space in the radial direction of the lens barrel,
It is possible to take a large amount of folding.

[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 horizontal sectional view showing one embodiment of a lens barrel according to the present invention.

FIG. 3 is a sectional view showing an embodiment of a lens barrel according to the present invention.

FIG. 4 is a sectional view showing an embodiment of a lens barrel according to the present invention.

FIG. 5 is a sectional view showing one embodiment of a lens barrel according to the present invention.

FIG. 6 is a sectional view showing an embodiment of a lens barrel according to the present invention.

FIG. 7 is a sectional view showing an embodiment of a lens barrel according to the present invention.

FIG. 8 is a sectional view showing an embodiment of a lens barrel according to the present invention.

FIG. 9 is a sectional view showing an embodiment of a lens barrel according to the present invention.

FIG. 10 is a sectional view showing an embodiment of a lens barrel according to the present invention.

FIG. 11 is a sectional view showing an embodiment of a lens barrel according to the present invention.

FIG. 12 is a perspective view showing an embodiment of a lens barrel according to the present invention.

FIG. 13 is a perspective view showing one embodiment of a lens barrel according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Flexible printed circuit board 20 Straight guide cylinder 30 Cam cylinder 31 Follower pin 40 Fixed cylinder 50 1 group lens 51 1 group frame 61 Shutter drive part 62 2 group frame 71 3 group lens frame 80 Printed circuit board 81 Shutter control CPU 90 Camera body 100 Clip 101 Clip 111 lens barrel drive motor

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Takeshi Gunji 3-2-2 Marunouchi, Chiyoda-ku, Tokyo Nikon Corporation

Claims (3)

[Claims] 1. A cylindrical member for holding a taking lens, a first electric device housed in the cylindrical member and moving in an optical axis direction, a second electric device fixedly housed in a camera body, A flexible wiring member connected to the first electrical device and the second electrical device and folded and stored in the cylindrical member in preparation for the movement of the first electrical device; A lens barrel, wherein the plurality of folded portions are arranged side by side in the circumferential direction of the cylindrical member. 2. A cylindrical member for holding a taking lens; a first electric device housed in the cylindrical member and moving in the optical axis direction; a second electric device fixedly housed in a camera body; A flexible wiring member connected to the first electrical device and the second electrical device and folded and stored in the cylindrical member in preparation for the movement of the first electrical device; A plurality of folded portions are arranged side by side in an optical axis direction of the cylindrical member. 3. The lens barrel according to claim 1, wherein the flexible wiring member is a flexible printed circuit board.