JPS5950966B2 - Optical system drive device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an optical system drive device, which is small and lightweight, and which simplifies the optical axis adjustment method, absorbs tensions and uneven dimensional accuracy of various parts, reduces man-hours, and costs of parts. The purpose is to achieve a reduction in

An example of a conventional optical system driving device is shown in FIG.

1 and 2 are first and second movable reflecting mirrors, respectively, and have support members 3 and 4 at the ends on the same side.

The support members 3 and 4 are supported by one guide rail 5 and are slidable. Further, rollers 6, 6', 7, and 7' are provided at the other ends of the movable reflecting mirrors 1 and 2, and rails 8
It is supported above and can be rotated and moved. A pulley 9 is provided at the end of the movable reflector 2 on the roller side, and a wire 12 is connected to the pulley 9 and the fixed pulleys 1, 11.
is being passed over. This optical system is driven by a wire 12 on one side, and is generally called a one-sided wire drive system. The single-side wire drive type optical system drive device does not require optical axis adjustment and it is easy to set the wire tension, but the support members (support members 3, 4, guide rail 5, rail 8 etc.) are large and occupy a large space, making it difficult to reduce the size and weight of the device.

On the other hand, there is a double-sided wire drive system in which wires are stretched independently on both sides, which is advantageous in terms of size and weight reduction. It is difficult to balance the amount of movement, adjust the optical axis, etc.
The disadvantage is that the number of man-hours increases and variations in the above-mentioned adjustments are likely to occur, and therefore high precision is required of the parts, which increases costs.

The present invention has been made in view of the above-mentioned drawbacks of the conventional technology, and it achieves the same size and weight reduction as the double-sided wire drive system, and at the same time, it facilitates the adjustment of each part and makes the precision of the parts loose. This achieved cost reduction.

An embodiment of the present invention will be described below based on the drawings. In FIG. 2, 13 and 14 are first and second movable reflecting mirrors,
Support and movement are achieved by rotation of pulleys provided on both sides on the rails 15, 15'.

] 6, 16″ are pulleys provided at both ends of the second movable reflecting mirror, 17, 18, 19, 20, 1T, 18″, 19
'', 2'' are fixed pulleys that guide the wires 21, 2'', respectively, and 22, 22'' are wire drums that transmit driving force to the wires. The wires 21, 2 "one ends A, A" are fixed to the wire length adjusting devices 23, 23" on both sides, respectively, and the other ends B, B" are stretched on the above-mentioned fixed pulley, wire drum, etc. They are connected to both ends of the wire tension spring 24, respectively. According to the above configuration, the wire tension spring 24 generates a set tension for the wires 21 and 2'' on both sides, and at the same time maintains the tension equally.

Therefore, when adjusting the length of the wire when adjusting the optical axis, it is very difficult to set the tension and adjust the optical axis in order to prevent the wire from sagging and to maintain balance by equally dividing the change in tension between both sides. becomes easier. Furthermore, since the wire tension spring 24 described above can absorb changes in dimensions related to the length of the wire, it is possible to loosen the dimensional accuracy of each component, and it is also possible to deal with variations between each device. can reduce costs. In addition, in the above embodiment, one wire was provided on both sides, and the wire was 21.2 mm long, but the invention of the present application is characterized in that an equal tension is applied to the wires running on both sides.
Wire length adjustment device 2 with left and right sides on both sides as shown in the figure
A device 26 for applying tension to the position of the wire tension spring 24 in FIG. 2 may be provided using a single wire 25 fixed and stretched at the wires 3 and 23'', respectively.

This device is composed of a pulley 27 that comes into contact with the wire 25, and a spring 28 that pulls the pulley 27.
It goes without saying that this embodiment also provides the above effects. As described above, according to the present invention, it is possible to realize miniaturization and weight reduction, and it is possible to easily adjust the optical axis and the tension of the wire, and also to absorb dimensional variations, so that the accuracy of parts can be reduced. It is possible to provide an excellent optical system drive device that can reduce costs.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of essential parts showing an example of a conventional optical system drive device.
FIG. 2 is a perspective view of a main part of one embodiment of the present invention, and FIG. 3 is a perspective view of a main part of another embodiment. 13...First movable reflecting mirror, 14...Second movable reflecting mirror, 15, 15''...Rule, 16
, 16"...Puri, 21, 2"...
・・Wire, 22,22″・・・Wire drum,
23, 23″... Wire length adjustment device, 24.
... wire tension spring, 25 ... wire, 27 ... pulley, 28 ... spring.

Claims (1)

[Claims] 1. A first movable reflector and a second movable reflector movably supported on a rail, pulleys rotatably provided at both ends of the second movable reflector, and a wire drum that transmits driving force to the wire. A wire, one end of which is fixed to a wire length adjustment device provided on each side, is stretched across the pulley and wire drum on both sides, and tension is applied to the center of the wire to generate tension equally on both sides. An optical system driving device characterized by comprising means.