JPH0723763Y2 - Printed board mounting device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a device for mounting a printed board, and in particular, in a lens barrel or the like, a first member as a fixed barrel and a movable barrel both having a ring shape and substantially the same shape. Suitable for mounting a flexible printed board in a narrow ring-shaped space formed by the second member, electrically connecting the first member and the second member, and relatively moving both members. The present invention relates to a printed board mounting device.

(Prior Art) Conventionally, flexible printed boards are thin and have excellent flexibility, can be flexibly bent freely, and can be efficiently stored in a narrow space inside the device, so the camera body and lens mirror It is used in various devices such as cylinders.

Of these, the diameter of the fixed barrel as the inner casing connected to the camera body side in the lens barrel is different from the diameter of the movable barrel as the outer casing for zooming and focusing operations, and the space sandwiched between both barrels If the width is wide, the flexible printed board 43 can be bent 180 degrees and mounted in the space as shown in FIG. 4, for example. This allows the fixed cylinder 41 to move to the movable cylinder.
Electrical connection to 42 is made so that when the movable cylinder 42 is moved, the bent portion 44 of the printed board 43 is displaced in the moving direction.

However, for example, as shown in FIG. 5, in the configuration of the lens barrel, the inner diameter is limited in order to hold the lens system and the like inside, and the outer diameter is also limited by the outer casing of the lens barrel and is fixed. In some cases, the diameters of the cylinder 51 and the movable cylinder 52 are substantially the same, and both cylinders must be arranged so as to face each other. At this time, the flexible printed board connection method as shown in FIG. 4 cannot be used. Generally, it is very difficult to mount a printed circuit board in such a ring-shaped space with a simple structure and electrically connect both cylinders, and the space has not been used so far.

(Problems to be Solved by the Invention) The present invention inserts a flexible printed board into a narrow ring-shaped space formed by a fixed barrel and a movable barrel of a lens barrel having substantially the same diameter, An object of the present invention is to provide a mounting device for a printed board, which is capable of electrically connecting both cylinders and electrically moving a movable cylinder relative to a fixed cylinder with high reliability.

(Means for Solving the Problems) A ring-shaped first member and a second member are arranged so as to face each other, and the first member and the second member relatively move in the thrust direction and a printed board. In the mounting device for the printed board, wherein the first and second members are electrically connected by
The printed board has a flexible arcuate band shape, and has a first mounting portion having a first curvature substantially equal to the annular portion of the first member, and an annular portion of the second member. A second mounting portion having a substantially equal second curvature, and an intermediate portion having a curvature smaller than the first and second curvatures between the first mounting portion and the second mounting portion. Is formed, and the first mounting portion is fixed to the facing surface of the first member facing the second member in a state where the printed board is bent at about 180 °, That is, the mounting portion is fixed to the facing surface of the second member that faces the first member.

(Embodiment) FIG. 1 (A) is a schematic view of an embodiment of the present invention. In FIG. 1, 1 is a fixed cylinder as a first member (also referred to as “first member”), and 2 is a movable cylinder as a second member (also referred to as “second member”). And the outer dimensions of the movable barrel 2 are substantially equal. Reference numeral 3 denotes a flexible printed board having an arc band shape having the above-described shape, which is bent 180 degrees in the longitudinal direction to form a bent portion 3a, and the fixed cylinder 1 and the movable cylinder 2 are formed.
Both end portions 3c and 3d are fixed in the opposing surface direction of the fixed cylinder 1 and the movable cylinder 2, respectively, and both cylinders are electrically connected. Fig. 1 (B)
In FIG. 1 (A), the movable barrel 2 is moved in the direction of arrow 11, that is, in the thrust direction to move the fixed barrel 1 and the movable barrel 2.
It is explanatory drawing of one Example when the space | interval of and is expanded.
In the figure, 3b shows the displacement state of the bent portion of the printed board 3.

The printed board 3 according to this embodiment has a ring shape composed of a plurality of regions 21a, 21c and 21d having different curvatures, as shown in the development view of FIG. Mounting part,
The left area 21a forms a second mounting portion, and the area 21c forms an intermediate portion. Of these, 21a has a curvature substantially equal to the fixed portion of the fixed barrel 1 and the movable barrel 2, and 21c and 21d have 180 degrees. In particular, at a portion having a curvature smaller than that of the portion 21a so as to approximate a ring shape between the fixed barrel 1 and the movable barrel 2 when bent, 21d.
Has a linear shape. The printed board 3 having the above-described shape is bent 180 degrees from the vicinity of the position indicated by the dotted line 21, and is sandwiched in the annular space in the thrust direction formed between the movable cylinder 2 and the fixed cylinder 1.

An electrical connection portion (not shown) provided on one end 3c of the printed board 3 is electrically connected to a printed board or the like (not shown) arranged on the fixed cylinder 1, and an electrical connection (not shown) provided on the other end 3d. The portion is electrically connected to a printed board or the like (not shown) arranged on the movable cylinder 2.

The shape of the printed board 3 according to this embodiment is substantially symmetrical with respect to the dotted line 21.

FIG. 3 is a schematic diagram showing the relationship between the fixed cylinder 1 and the printed board 3 of FIG. 1 (A). In the figure, the bent portion 3a of the printed board 3 is displaced to the position indicated by 3b when the gap between the fixed cylinder 1 and the movable cylinder 2 is displaced, and at this time, the bending direction indicated by the arrow 31a is indicated by the dotted line 31b. As shown in the figure, the ring-like shape is displaced in the direction of the center of curvature 30.

In the present embodiment, as described above, the flexible printed board 3 having the above-described shape is bent and mounted in the narrow space of the annular shape formed by the fixed tube 1 and the movable tube 2 having the annular shape or the donut shape. At this time, even if the printed board 3 is arbitrarily deformed in the space, it does not protrude from the annular space and does not adversely affect the photographic optical system and the like, and the movable cylinder 2 is smoothly displaced. I am able to do it.

(Effect of the Invention) According to the present invention, in the narrow annular space formed by the fixed barrel (first member) and the movable barrel (second member) having substantially the same diameter as the lens barrel as described above. The printed board provided on the first member has a first curvature that is substantially equal to the annular portion of the first member.
A first mounting portion for the second member, and a second mounting portion for the second member, a first mounting portion, and a second mounting portion having a second curvature substantially equal to the annular portion of the second member. The first member and the second member are electrically reliable in the thrust direction by having an arcuate band shape in which an intermediate portion having a curvature smaller than the first and second curvatures is provided between the first member and the second member. Therefore, it is possible to achieve a printed board mounting device that has the above-mentioned structure and can be smoothly displaced, and that when the displacement is caused, a part of the printed board does not protrude from the annular space.

[Brief description of drawings]

1 (A) and 1 (B) are schematic views of an embodiment of the present invention, FIG. 2 is a development explanatory view of a printed board according to the present invention, and FIG. 3 is a schematic view of a part of FIG. FIG. 4 is an explanatory view of a printed board in a conventional lens barrel, and FIG. 5 is an explanatory view showing a relationship between a fixed barrel and a movable barrel. In the figure, 1 is a fixed cylinder, 2 is a movable cylinder, 3 is a printed board, 3a and 3b are bent portions, and 3c and 3d.
Are end portions of the printed board 3, 31a and 31b are bending directions of the bent portions, and 21a to 21d are regions having different curvatures.

Claims (1)

[Scope of utility model registration request] 1. A ring-shaped first member and a second member are arranged so as to face each other, the first member and the second member relatively move in the thrust direction, and the first member and the second member are moved by a printed board.
In a mounting device for a printed board in which a first member and a second member are electrically connected, the printed board has an arc strip shape having flexibility, and is substantially equal to an annular portion of the first member. Of the first mounting portion having a curvature of, a second mounting portion having a second curvature substantially equal to the annular portion of the second member, and the first mounting portion and the second mounting portion. An intermediate portion having a curvature smaller than the first and second curvatures is formed therebetween, and the printed board is substantially
In a state of being bent at 180 °, the first mounting portion is fixed to the facing surface of the first member facing the second member, and the second mounting portion is fixed to the second member of the second member. 1. A printed board mounting device, characterized in that it is fixed to the facing surface facing the member 1.