Operating device, position-switching device, and magneto-optical recording/reproducing device

Abstract

An operating device has a pair of linear members (43, 44) made of a shape memory alloy and contracting axially due to heat generated by electrification and generating tension in the contracting direction, a drive lever (19) supported to pivot about a pivot shaft (19a), a pair of drive rods (33, 34) respectively connected to both sides of the drive lever (19) with the pivot shaft (19a) being disposed between the sides of the drive lever (19), and a power supply circuit for selectively electrifying the linear members (43, 44). One end of each of the linear members (43, 44) is fixed to a stationary member, and the other end is connected to each of the drive rods (33, 34).

Description

(1) Technical field [0001] The invention relates to a magneto-optical recording and reproducing device capable of recording and reproducing information on a disc and a position switching device suitable for the magneto-optical recording and reproducing device, in particular to an operating device and switching of a magnetic head assembly by driving the operating device Position switcher for position. (2) Background technology [0002] In recent years, magneto-optical recording and reproducing devices that use optical discs as recording media to read and reproduce through optical pick-ups tend to be more and more miniaturized and high-performance. As a recording / reproducing device, a portable MD recorder using a mini-disc (MD) has been widely used. [0003] As a conventional magneto-optical recording and reproducing device, there is, for example, one disclosed in Japanese Patent Application Laid-Open No. 2002-32938. refer to Figure 35 ~ Figure 4 2. This magneto-optical rec...

AI Technical Summary

Problems solved by technology

[0013] The value of this height dimension is the value obtained by adding the thickness of the body part of the motor 117 and the thickness of the drive gear 118, or the thickness of the body part of the motor 117 and the thickness of the reduction gear 119 plus the gap height between the two. value, or the diameter of the worm wheel 124 and the thickness of the reduction gear 118 plus the value of the gap height between the two, it is difficult to achieve thinning, and as a result, there is a problem that the thickness of the portable MD recorder is thick

[0014] Since it is a complex speed reduction mechanism that decelerates and transmits the rotational force of the motor 117 through a plurality of gears, it has a large shape in terms of structure, and the cost of the motor itself is also high, resulting in an increase in the number of parts and high manufacturing costs.

In addition, when it is necessary to improve the responsiveness to electrical signals, there is a problem that the control of electrical signals tends to be complicated.

[0015] Even if the plunger is used to replace the motor 117, the same problem exists. The size of the mechanism is determined by the size of the plunger itself, which causes the problem that the cost of the plunger itself is high.

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