JPH03219221A - Storage device for flexible printed board in camera - Google Patents

Abstract

PURPOSE:To control the moving state of a flexible printed board in expanding/ contracting operation and to miniaturize a device by making the energizing force of an energizing member operate on the flexible printed board through a folded part at all times. CONSTITUTION:A hanging pot type folding-back means has a 1st folded part 7 provided with the flexible printed board 6 connecting a shutter block 5 and an electric circuit part in a camera main body 1 so that the board is fixed on the camera main body side, and a 2nd folded part 9 which is provided mova bly between the 1st folded part and electric circuit part and energized in a specific direction. The flexible printed board 6 moves associatively with the movement of the shutter block 5 while energized by the 2nd folded part 9. Consequently, the flexible printed board 6 is held without slacking and the space required for the arrangement in the camera can be made small.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention provides a flexible printed circuit board for electrically connecting a camera body and a printer block that moves together with the lens within the lens barrel of a camera. The present invention relates to a storage device that effectively stores a cylinder inside a camera as it moves.

BACKGROUND ART Conventionally, cameras, particularly cameras equipped with a zoom lens and cameras with switching focal length, have been equipped with a shutter block that moves together with the lens within the lens barrel. It was necessary to electrically connect the two.

For this reason, conventional methods have been used to electrically connect by placing a sliding contact piece on a part of the lens barrel and fixing a printed circuit board to the camera body, or by using flexible printing between the shutter block and the camera body. Various means for bonding using a substrate have been proposed or put into practical use.

However, with the former method, there are concerns about poor contact between the contact piece and the button on the board, and when it is desired to send and receive multiple types of signals, the number of contact parts increases, further reducing reliability, and in addition, space efficiency is poor. , which had the problem of high costs.

On the other hand, since the latter method uses a flexible printed circuit board with excellent elasticity and high density, it does not suffer from the above-mentioned problems and is more advantageous than the former method.

As the latter means, for example, Japanese Utility Model Application Publication No. 63-10618 utilizes the natural bending of a flexible printed circuit board.
The configurations disclosed in Publication No. 5, Publication No. 63-106186, etc., or the configuration disclosed in Publication of Utility Model Application Laid-Open No. 63-39216, etc., in which a folding guide plate of a flexible printed circuit board is provided in the lens barrel, etc., are well known. be.

Problems to be Solved by the Invention Each of the configurations using a flexible printed circuit board as described above is advantageous compared to the means using a sliding contact piece, but the former configuration has a disadvantage in that it allows the flexible printed circuit board to bend naturally. It is necessary to provide sufficient space around the lens barrel, which has the disadvantage of increasing the size of the device.

Compared to the former configuration, the latter configuration allows the bending of the flexible printed circuit board to be controlled by a guide plate, so the space required for the board can be reduced; however, since the guide plate is provided inside the lens barrel, the lens mirror This has the disadvantage that it is necessary to cut out a part of the cylinder, making the structure complicated and subject to various restrictions.

At the same time, since the flexible printed circuit board is placed in a position visible from the film side of the camera for processing inside the lens barrel, it is thought that flare may occur due to internal reflection of external light. It also has the disadvantage that great care must be taken to prevent its occurrence.

Furthermore, considering the recent tendency for cameras equipped with zoom lenses to have longer focal lengths, the above-mentioned flexible printed circuit boards have to become increasingly longer, and in such a case, the above-mentioned configuration becomes even more disadvantageous.

Means for Solving the Problems The storage device for a flexible printed circuit board in a camera according to the present invention was created in consideration of the above-mentioned disadvantages, and includes a shutter block mounted on a member moving in the optical axis direction within the lens barrel. A flexible printed circuit board that electrically connects a flexible printed circuit board and an electric circuit provided in the camera body is connected to at least a first folded portion fixedly provided on the camera body side, and the first folded portion and the electric circuit. The second folding section is movably provided between the first folding section and the second folding section and is biased in a predetermined direction.

Function: Since the storage device for a flexible printed circuit board in a camera according to the present invention has the above-described configuration, the flexible printed circuit board moves the optical axis direction moving member in the lens barrel while being biased by the second folded portion. It will be moved in conjunction with the

Therefore, the flexible printed circuit board is always maintained in a state without sag, and the space required for installation within the camera can be reduced, and the biasing force is supplied through a portion called the second folded portion. In other words, since the biasing force is supplied in a small area, the biasing force supply means does not need to be large, and of course there is no need to cut out the lens barrel.

EXAMPLE Hereinafter, an example of a storage device for a flexible printed circuit board in a camera according to the present invention will be described.

FIG. 1 is a sectional view of a main part showing an embodiment of a storage device for a flexible printed circuit board in a camera according to the present invention.

A lens barrel fixing part 2 fixed to a part of the camera body 1 is provided with a lens barrel 3 holding a photographing lens L, which is a moving member in the optical axis direction, and is extended by zooming, that is, moved in the optical axis direction. A suitable rhythm mechanism 4 is provided.

A shutter block 5 is attached to a part of the photographic lens L in the lens barrel 3, and a first folding part 7 is attached to a part 2a of the lens barrel fixing part 2 and is folded back by contacting a flexible printed circuit board 6, which will be described later. A first pulley 8 is provided.

One end portion 6a of the flexible printed circuit board 6 is fixed to the shutter block 5, and a portion 6b of the flexible printed circuit board 6 is attached to the first pulley 8 of the first folded portion 7, as is clear from the figure. A second folded part 9 is folded back and further forms a part of a second folded part 9, which will be described later.
After being folded back by the pulley 10, it is fixed, for example, to another part 2b of the lens barrel fixing part 2 as shown in the figure, or to an appropriate part of the camera body 1 by fixing means such as screws.

The second folding portion 9 includes a second pulley 10 that contacts the flexible printed circuit board 6 and folds back;
and a holding frame 11 that rotatably holds the lens barrel, and in this embodiment, it is arranged in a storage part 2C formed in an appropriate part of the lens barrel fixing part 2 located outside the lens barrel 3, Furthermore, it is constantly biased in the direction of arrow X by a spring 12 which is a biasing member.

As shown in FIG. 3, the holding frame 11 is provided with, for example, rectangular protrusions 11a and Ilb on both sides, and on the other hand, the protrusions 11a and Ilb of the storage portion 2c in which the holding frame 11 is accommodated are provided.
As shown in FIG. 4, the portion corresponding to b is provided with the protrusion 11a,
A rectangular groove 13.13 into which the holder llb fits is formed, and this structure allows the holding frame 11 to move within the storage portion 2c.

As is clear from the drawings, in this example, the first
A light shielding plate 14 is provided above the pulley 8 in the drawing to prevent light from reaching the flexible printed circuit board 6 from the right direction in the drawing, that is, from the film side (not shown).

Since one embodiment of the storage device for a flexible printed circuit board in a camera according to the present invention is configured as described above, in order to move the photographing lens L in the optical axis direction from the state shown in FIG. When the lens barrel 3 is extended to the left in the drawing, the shutter block 5 also moves in the same direction, and one end 6a of the shutter block 5 moves in the same direction.
The flexible printed circuit board 6 fixed to is also pulled in the same direction.

The other end 6b of the flexible printed circuit board 6 is fixed to a part 2b of the lens barrel fixing part 2, and the first pulley 8 cannot be moved, so when it is pulled as described above, the tensile force is It is transmitted to the second folded part 9 via the printed circuit board 6, and this second folded part 9
moves in the right direction in the drawing against the biasing force of the spring 12 to the state shown in FIG.

At this time, it goes without saying that the biasing force of the spring 12 acts on the flexible printed circuit board 6 at all times, and therefore its moving state is a moving state in which it moves through a predetermined portion controlled by the biasing force of the spring 12. Become.

Next, when the lens barrel 3 moves to the right in the drawing from the state shown in FIG. 2, the shutter block 5 similarly moves to the right, and of course the flexible printed circuit board 6 also moves to the right. In other words, it tries to sag.

However, as mentioned above, the flexible printed circuit board 6 is fixed to the part 2b of the lens barrel 2 via the movable second folded part 9, so in the above case, the flexible printed circuit board 6 12, the second pulley 10 of the second folded portion 9 moves without sagging until it reaches the position shown by the dashed line in FIG.

At this time, it is needless to mention in detail that the flexible printed circuit board 6 moves in a predetermined portion, that is, as in the previous case, it is controlled by the biasing force of the spring 12.

As described above, the flexible printed circuit board in the storage device according to the present invention is always maintained in a state without sag, and the space required for installation within the camera can be reduced.

Furthermore, since the biasing force is supplied through a portion called the second folded portion, that is, the biasing force is supplied in a small area, so that the biasing force supply means does not become large.
As a result, the shape of the storage device can be reduced, the outside of the lens barrel can be used, and of course there is no need to cut out the lens barrel.

In addition, since the flexible printed circuit board 6 can be maintained in a state without sagging at all times, no particular problem will occur even if a separate member is provided close to the periphery of the flexible printed circuit board 6. A light shielding plate 14 for the purpose of preventing the occurrence of flare due to internal reflection of light can be placed close to the flexible printed circuit board 6. In other words, it is no exaggeration to say that the light shielding plate 14 can be provided because the state of the flexible printed circuit board 6 can be managed as described above.

Although not detailed in the previous explanation, the first and second pulleys 8
．． 10 is preferably formed into a cylindrical shape as shown in FIGS. 3 and 4, for example, so that the flexible printed circuit board 6 can be smoothly bent.

Further, the contact member with the flexible printed circuit board 6 in the first and second folded portions 7.9 is preferably a pulley 8.10 as described in the embodiment, but is not limited to this. For example, it may be replaced with a cylindrical member that does not rotate.

Furthermore, if the flexible printed circuit board 6 is connected to the first pulley 8
so that the flexible printed circuit board 6 slides smoothly even if the flexible printed circuit board 6 moves without contacting the board and sag occurs.
As shown in FIG. 1, it goes without saying that it is preferable that the shape of the portion 1a of the camera body 1 facing the first pulley 8 is formed to have a curved cross section.

Effects of the Invention The storage device for a flexible printed circuit board in a camera according to the present invention constantly applies a biasing force to the flexible printed circuit board via the folded portion by the biasing member. In other words, the space in which it is placed can be set to a predetermined space that can be managed in advance, and as a result, it has the effect of being able to reduce its size.

In addition, the above effect makes it possible to deploy the light shielding member without particularly increasing the size of the device, so it is expected to have an extremely advantageous effect against the occurrence of flare caused by light reaching the flexible printed circuit board from the film side. can.

Further, due to the above-mentioned effects, it is possible to expect the effect that the camera having the storage device according to the present invention can be made compact without unnecessarily increasing the size.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view of essential parts showing an embodiment of a storage device for a flexible printed circuit board in a camera according to the present invention, and FIG.
The figure is a sectional view of the main part for explaining the operating state of the storage device, FIG. 3 is a partial perspective view showing the area around the second folded part in the storage device, and FIG. FIG. 3 is a partial cross-sectional view of the vicinity of the folded portion.

Claims (5)

[Claims] (1) A flexible printed circuit board, one end of which is fixed to a shutter block mounted on an optical axis moving member within the lens barrel, and the other end of which is fixed to a fixed portion of the lens barrel provided in the camera body; At least a first folding part formed on the fixing part and folding back the flexible printed circuit board by contacting with the flexible printed circuit board; further includes a second folding part for folding back the flexible printed circuit board, a folding means for folding back the flexible printed circuit board an appropriate number of times, and a biasing means for urging the second folding part in a predetermined direction to remove slack in the flexible printed circuit board. A storage device for flexible printed circuit boards in cameras. (2) A flexible printed circuit board that electrically connects the shutter block mounted on the optical axis moving member inside the lens barrel and the electric circuit section provided inside the camera body is fixed to at least the camera body side. a first folded part provided in the state of the first folded part; and a second folded part provided so as to be movable between the first folded part and the electric circuit section and biased in a direction away from the first folded part. A storage device for a flexible printed circuit board in a camera, which is stored in the camera via a fishing bottle-type folding means. (3) A flexible printed circuit board that electrically connects the shutter block mounted on the optical axis direction moving member inside the lens barrel and the electric circuit section provided inside the camera body via a folded section an appropriate number of times. In the storage device in the camera, the appropriate number of folded portions are biased in a predetermined direction by receiving a biasing force from a biasing means, and are movable under the action of the biasing force. 1. A storage device for a flexible printed circuit board in a camera, including two folded portions, and wherein slack of the flexible printed circuit board is removed by the biasing force. (4) The lens according to any one of claims (1) to (3), further comprising a light shielding plate disposed near the flexible printed circuit board in the lens barrel to prevent light from the film surface side from reaching the flexible printed circuit board. Storage device for flexible printed circuit boards in cameras. (5) The storage device for a flexible printed circuit board in a camera according to any one of claims (1) to (4), wherein the folding portion for folding back the flexible printed circuit board includes a cylindrical pulley that comes into contact with the flexible printed circuit board.