JPH11287939A - Lens barrel provided with single-sided flexible printed circuit board - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lens barrel functioned by a single-sided flexible printed circuit board without using a double-sided flexible printed circuit board by providing the single-sided flexible printed circuit board having a main single- sided printed circuit board and a sub single-sided printed circuit boards extending from the side faces of the main single-sided printed circuit board. SOLUTION: The single-sided flexible printed circuit board is arranged on the inner diameter side of a fixed cylinder. The single-sided flexible printed circuit board is composed of a main single side flexible printed circuit board 20 and first and second sub single-sided flexible printed circuit boards 21 and 22. An electric component including a CPU 1d and a first encoder 1a are mounted on the main board 20. The first sub board 21 has an extension part 21a extending from one side face of the main board 20, and a second encoder 1b is formed in the direction orthogonal to extension part 21a. The second sub board 22 has an extension part 22a extending from another side face of the main board 20 and a contact part 1c is formed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lens barrel having a single-sided flexible printed circuit board. More specifically, the present invention relates to an effective arrangement of a single-sided flexible printed circuit board.

[0002]

2. Description of the Related Art Conventionally, in a lens barrel having a flexible printed circuit board, the flexible printed circuit board is configured as shown in FIGS. FIG. 4 is a longitudinal sectional view of a lens barrel provided with a conventional flexible printed circuit board,
FIG. 5 is a virtual perspective view illustrating a state where a conventional flexible printed circuit board is arranged.

Hereinafter, a conventional technique will be described with reference to the drawings. In FIG. 4, the flexible printed circuit board 31 is
It has a first encoder 31a, a second encoder 31b, and a contact portion 31c. Then, the first encoder 31
a is formed on the inner peripheral surface of the fixed cylinder 36, and the part formed with the second encoder 31b is fixed on the fixed cylinder tip 36a.
Each is fixed. The contact portion 31c is provided with a bayonet mount 3 fixed to the rear end surface of the fixed cylinder 36.
7 is fixed to a contact member 38 arranged in the vicinity of 7.

The first encoder 31a has a variable-magnification operation ring 3
A plurality of brushes 32a supported by a brush support plate 32 fixed to 5 are in contact with each other in a rotatable manner. As a result, the amount of rotation of the zoom ring 35 during the zoom operation is detected. The second encoder 31b includes a plurality of brushes 33a supported by a brush mounting portion 34a of the focusing operation ring 34.
Are rotatably slidably in contact with each other. Thus, the amount of rotation of the focusing operation ring 34 during the focusing operation is detected.

[0005] The flexible printed circuit board 31 arranged as described above has a shape as shown in FIG. 5 in the lens barrel. The formation portion of the first encoder 31a is entirely in an arc shape along the inner peripheral surface of the fixed cylinder, and the inner peripheral surface 31a 'is the formation surface of the first encoder. The formation portion of the second encoder 31b extending from the left end surface (the front side of the lens barrel) of the formation portion of the first encoder 31a has a shape along the outer circumference of the fixed barrel tip portion 36a. 'Is formed so as to be a forming surface of the second encoder. Further, the formation portion of the contact portion 31c extends from the right end surface (rear side of the lens barrel) of the formation portion of the first encoder 31a to the right side (rear side of the lens barrel) of the drawing. And it is a shape which is arrange | positioned with the surface in which the contact part 31c was formed as an outer peripheral surface.

[0006]

In such a conventional structure, a first encoder 31a is formed on one surface of a flexible printed circuit board 31, and a second encoder 31b and a contact portion 31c are formed on the other surface. Will be. Therefore, in order to satisfy this, a two-sided flexible printed circuit board must be used. However, since the double-sided flexible printed circuit board is more expensive than the single-sided flexible printed circuit board, there is a problem that the cost is increased.

The present invention has been made in view of such conventional problems, and it is an object of the present invention that the internal structure of a lens barrel on which a flexible printed circuit board is arranged is similar to that of the prior art. It is an object of the present invention to provide a lens barrel which functions on a single-sided flexible printed circuit board without using a double-sided flexible printed circuit board.

[0008]

In order to achieve the above object, according to the present invention, a main single-sided printed circuit board on which an electrical component is mounted and a first encoder is formed, and one of the main single-sided flexible printed circuit board is provided. Second extending from the side
A first sub-simple single-sided flexible printed circuit board on which an encoder is formed, and a second sub-simultaneous flexible printed circuit board formed with electrical contacts extending from the other side of the main single-sided flexible printed circuit board
And a sub-single-sided flexible printed circuit board.

The first sub-single-sided flexible printed circuit board has a bent portion in the vicinity of the main one-sided flexible printed-circuit board so as to be inverted and extended from one side to the other. Has a bent portion in the vicinity of the main single-sided flexible printed circuit board for inverting and extending from the other side to one side.
And a main single-sided printed circuit board on which an electrical component is mounted and on which a first encoder is formed, further disposed on an inner peripheral portion of the fixed cylinder near the lens mount.
A first sub-single-sided flexible board formed with a second encoder which is bent from the rear end face of the lens barrel of the main single-sided printed circuit board to the front of the lens barrel and is reversed and arranged on the outer peripheral face of the fixed barrel in front of the lens barrel. An electrical contact was formed between the printed circuit board and the outside, which was bent from the front end face of the lens barrel of the main single-sided flexible printed board to the rear of the lens barrel, turned over, and arranged at a position leading to the outside near the lens mount. Having a second sub-one-sided flexible printed circuit board is a means for solving the third problem. Further, the first encoder is engaged with a brush interlocking with a zoom ring to detect rotation of the zoom ring, and the second encoder is engaged with a brush interlocking with a focusing ring and detects the rotation of the focusing ring. Detecting the rotation is a means for solving the fourth problem.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a longitudinal sectional view of a lens barrel provided with a single-sided flexible printed circuit board showing an embodiment of the present invention, FIG. 2 is a plan view illustrating a single-sided flexible board of the present invention, and FIG. 3 is an embodiment of the present invention. FIG. 4 is a virtual perspective view illustrating a state where a single-sided flexible printed circuit board is disposed.

In FIG. 1, a focusing lens group 3 arranged at the front of the lens barrel is held by a focusing lens frame 3a. The focusing lens frame 3 a is fitted and fixed to a fitting portion provided at one end of the focusing moving ring 4, and is integrated with the focusing moving frame 4. A female helicoid screw 5a is threaded on the inner peripheral surface of the focusing movement frame 4, and a fitting key 5b projecting from the outer periphery is formed on the other end. The fitting key 5b is fitted in a linear keyway 11a formed on the inner peripheral surface of the focusing operation ring 11 rotatably fitted on the outer periphery of the fixed cylinder 2, and the rotation of the focusing operation ring 11 is achieved. The focusing moving ring 4 is rotated in conjunction with. In addition, a brush mounting portion 11b is formed at a distal end portion of the focusing operation ring 11, and a plurality of brushes 11c are fixed here. The brush 11c is disposed so as to slidably contact a second encoder 1b described later.

The fixed barrel 2 has a bayonet mount 6 for fixing the lens barrel to the camera body fixed to the rear end face, and a variable magnification operation ring 7 is rotatable substantially at the outer periphery of the center. Mated. The variable power operation ring 7 has, on its inner peripheral surface,
A rectilinear groove 7a in the optical axis direction is formed.
The engaging portion 8a of the cam ring 8 is engaged with a. Further, a brush support plate 12 is fixedly provided, and a plurality of brushes 12a are fixedly provided on the brush support plate 12. In addition, brush 1
2a is arrange | positioned so that the 1st encoder 1a mentioned later may be slidably contacted. In the cam ring 8, a female lead screw 8c is threaded on the inner diameter surface, and a convex cam 8b is formed on the outer peripheral portion. A male lead screw 9b threaded around the outer periphery of the rear lens group frame 9a that holds the rear lens group 9 is screwed into the lead screw 8c of the cam ring 8. A cam groove 5b formed on the inner peripheral surface of the variable power moving ring 5 is fitted to the outer peripheral portion of the convex cam 8b. The variable-magnification moving ring 5 further has a male helicoid screw 5 a threaded on the outer peripheral portion thereof. The male helicoid screw 5 a is connected to the female helicoid screw 4 of the focusing moving ring 4.
a. The rear group lens frame 9a is formed with a straight keyway 9c in the optical axis direction, and the straight keyway 10 fixed to the fixed cylinder 2 is fitted into the straight keyway 9c.

In the above-described configuration, when the focusing operation ring 11 is rotated, the focusing movement ring 4 is integrally rotated via the fitting key 5b. By this rotation, the focusing movement ring 4 moves in the optical axis direction while rotating along the straight keyway 11a of the focusing operation ring 11 by the action of the male and female helicoid screws 4a, 5a, and the focusing formed integrally. Focusing is performed by moving the lens group 3 in the optical axis direction. Further, when the variable power operation ring 7 is rotated, the cam ring 8 is rotated integrally via the engaging portion 8a. By this rotation, the rear group lens frame 9a is screwed with the lead screws 9b and 8c and the straight key 10 and the straight key groove 9.
Due to the action of c, the light beam moves straight in the optical axis direction. Further, since the cam groove 5b of the variable power moving ring 5 is fitted into the convex cam 8b of the cam ring 8, the variable power moving ring 5 is moved in the optical axis direction by receiving the rotational force of the cam ring 8. I do. Accordingly, in conjunction with this movement, the focusing movement ring 4 and the focusing lens frame 3a move straight in the optical axis direction along the straight key groove 11a of the focusing operation ring 11. In this manner, by rotating the zooming operation ring 7, the rear lens group 9a and the focusing lens group 3a, which are formed integrally with the rear lens group frame 9a and the focusing lens frame 3a, respectively, move in the optical axis direction. Zooming is performed.

The single-sided flexible printed circuit board 1 is arranged on the inner diameter side of the fixed cylinder 2. As shown in FIG. 2, the single-sided flexible printed circuit board 1 extends from one side surface of the main single-sided flexible printed circuit board 20 on which the electrical components including the CPU 1d and the first encoder 1a are mounted. A first sub-single-sided flexible printed circuit board having an extending portion 21a and a second encoder orthogonal to the extending portion 21a, and an extending portion 22a extending from the other side surface;
Is formed from the second sub-flexible printed circuit board 22 on which is formed. In addition, the extension part 21a and the extension part 22a
In order to prevent mutual buffering when disposing in the lens barrel, the drawer is disposed at a position shifted by a predetermined amount from the diametrically opposite position. The electrical components including the CPU 1d, the first encoder 1b, and the second encoder 1c are arranged on the same surface of the one-side flexible printed circuit board 1.

The one-sided flexible printed circuit board 1 is arranged in the lens barrel as follows. First, the main single-sided flexible printed circuit board 20 is arranged and fixed on the inner peripheral surface of the fixed cylinder 2 toward the inside of the first encoder. Thereafter, in order to dispose the second encoder 1b on the outer periphery of the fixed barrel tip 2a located in front of the lens barrel, the first sub-flexible printed circuit board 21 extending rearward of the lens barrel is attached to the extension 21a. And the gap of the cam ring 8 is inserted. Then, the first sub-flexible printed circuit board 21 is fixed to the outer peripheral surface of the fixed cylinder tip 2a. This allows
The second encoder 1b is arranged toward the outside of the fixed cylinder. Further, in order to arrange the contact portion 1c near the bayonet mount 6 located at the rear of the lens barrel, the second sub-flexible printed circuit board extending to the front of the lens barrel similarly to the case of the second encoder 1b. 22 to the extension 22a
And the contact portion 1c is disposed on the contact member 13 near the bayonet mount 6.

The single-sided flexible printed circuit board 1 arranged as described above has a shape as shown in FIG. 3 in the lens barrel. The main single-sided flexible printed board 20 has an arcuate shape as a whole along the inner peripheral surface of the fixed cylinder.
The extension direction is inverted from the right end (rear side of the lens barrel) end face of the main single-sided flexible printed circuit board 20 where a 'is the surface on which the first encoder is formed, and the extension portion 21a is located on the left side of the drawing (lens mirror). (The front side of the cylinder). And
The first sub-flexible printed circuit board 21 is fixed to the fixed cylinder tip 2
The first sub-flexible printed circuit board 21 is formed so that the outer peripheral surface 1b 'thereof becomes the surface on which the second encoder is formed. Further, the extending direction is reversed from the left side (the front side of the lens barrel) end face of the main single-sided flexible printed circuit board 20 in the drawing, and the extending portion 22a extends to the right side (the rear side of the lens barrel). The second sub-flexible printed circuit board 22 has such a shape that the surface on which the contact portion 1c is formed is disposed as an outer peripheral surface.

In the lens barrel constructed as described above, when the focusing operation ring 11 is rotated for focusing, the plurality of brushes 11c fixed to the brush mounting portion 11b also rotate integrally. By this rotation, the plurality of brushes 11c
Slides on the pattern of the second encoder 1b. The pattern is detected by this sliding, and the detection signal is CP
The focus state is transmitted to U1d, and the focus state is transmitted to a camera body (not shown) via the contact portion 1c. When the zooming operation ring 7 is rotated for zooming, the brush 12a fixed to the brush support plate 12 also rotates integrally. By this rotation, the plurality of brushes 12a slide on the pattern of the first encoder 1a. The pattern is detected by this sliding, and this detection signal is transmitted to the CPU 1d, and the contact portion 1c
Is transmitted to a camera body (not shown) via the camera.

In the embodiment of the present invention, even if the patterns of the plurality of encoders and the arrangement directions of the contact portions do not coincide with each other, and even if a part is in the opposite direction, the arrangement can be performed by the single-sided flexible printed circuit board. It is what it is.

[0019]

As described above, according to the present invention,
In the internal structure of the lens barrel in which the flexible printed circuit board is arranged, even when the encoder forming surface of the flexible printed circuit board and the contact forming surface must be opposite surfaces, without using a double-sided flexible printed circuit board In addition, a single-sided flexible printed circuit board can function sufficiently.

Therefore, an expensive double-sided flexible printed circuit board is not required, which is effective in terms of cost.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a lens barrel including a single-sided flexible printed circuit board according to an embodiment of the present invention.

FIG. 2 is a plan view illustrating a single-sided flexible substrate of the present invention.

FIG. 3 is a virtual perspective view illustrating a state in which a single-sided flexible printed circuit board according to an embodiment of the present invention is disposed.

FIG. 4 is a longitudinal sectional view of a lens barrel provided with a conventional flexible printed circuit board.

FIG. 5 is a virtual perspective view illustrating a state where a conventional flexible printed circuit board is arranged.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Single-sided flexible printed circuit board 1a 1st encoder 1b 2nd encoder 1c Contact part 1d CPU 2 Fixed cylinder 2a Fixed cylinder tip 3 Focusing lens group 3a Focusing lens frame 4 Focusing movement ring 4a Female helicoid screw 5 Zoom movement ring 5a Male helicoid screw 5b Fitting key 6 Bayonet mount 7 Zoom operation ring 8 Cam ring 8a Engagement portion 8b Convex cam 8c Lead screw 9 Rear group lens group 9a Rear group lens frame 9b Lead screw 10 Straight key 11 Focusing operation ring 11a Key groove 11b Brush mounting portion 11c Brush 12 Brush support plate 12a Brush 13 Contact member 20 Main single-sided flexible printed circuit board 21 First sub-single-sided flexible printed circuit board 21a Extended section 22 Second sub-single-sided flexible printed circuit board 22a Extended section

Claims (4)

[Claims] 1. A main single-sided printed circuit board on which an electrical component is mounted and a first encoder is formed, and a first sub-single side formed with a second encoder extending from one side surface of the main single-sided flexible printed circuit board. A single-sided flexible printed circuit board comprising: a flexible printed circuit board; and a second sub-single-sided flexible printed circuit board formed with an electrical contact with the outside extending from the other side surface of the main single-sided flexible printed circuit board. Lens barrel. 2. The flexible printed circuit board according to claim 1, wherein the flexible printed circuit board has a bent portion in the vicinity of the flexible printed circuit board in one side and extending from one side to the other. 2. A lens barrel provided with a single-sided flexible printed circuit board according to claim 1, further comprising a bent portion in the vicinity of the main single-sided flexible printed circuit board for inverting and extending the other from one side to the other. 3. A main single-sided printed board on which an electrical component is mounted and on which a first encoder is formed, the main single-sided printed board being disposed on an inner peripheral portion of a fixed cylinder near a lens mount, and a rear end face of the main single-sided printed board on the lens barrel. A first sub-single-sided flexible printed board on which a second encoder is formed, which is bent forward of the lens barrel to be inverted and disposed on the outer peripheral surface of the fixed barrel in front of the lens barrel, and the main single-sided flexible printed board. A second end in which an electric contact with the outside is formed, which is bent from the front end face of the lens barrel to the rear of the lens barrel and inverted and disposed at a position leading to the outside near the lens mount;
A lens barrel provided with a single-sided flexible printed circuit board, comprising: a sub-single-sided flexible printed circuit board. 4. The first encoder is engaged with a brush interlocking with a zoom ring to detect rotation of the zoom ring, and the second encoder is engaged with a brush interlocking with a focusing ring to form a link. 4. A lens barrel provided with a single-sided flexible printed circuit board according to claim 3, wherein the rotation of the focus ring is detected.