| 摘要 |
PURPOSE:To obtain a small-sized optical head actuator without causing any beam shift by using a reflecting mirror supported by a pair of lamination type piezoelectric elements for generating a difference in height by a difference in voltages impressed on the lamination type piezoelectric element. CONSTITUTION:Both end parts of a reflecting mirror 1 are supported by a pair of lamination type piezoelectric elements 11, 12 which have been provided on a fixed base 9, and by an electric conduction to the lamination type piezoelectric elements 11, 12, the reflecting mirror 1 is driven in the directions as indicated with arrows A-A' centering around an aerial revolving shaft 0' and a light beam 7 is brought to an access. The lamination type piezoelectric elements 11, 12 are roughly proportional to magnitude of an impressed voltage, and stature, namely, height h1 and h2 are varied to h1' and h2', respectively. Accordingly, by controlling a value of the voltage applied to the lamination type piezoelectric element 11 and 12, a rotational angle theta of a galvanomirror 10 and a position of O which becomes a turning center can be changed freely.
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