| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an optical pickup apparatus provided with a shape variable mirror with suppressed number of piezoelectric elements and capable of reducing the difference of voltages applied to respective piezoelectric elements in wavefront aberration in the optical pickup apparatus capable of compensating wavefront aberration using the shape variable mirror wherein a mirror surface is deformed by utilizing displacement in the longitudinal direction of the piezoelectric element. <P>SOLUTION: The shape variable mirror 6 disposed in the optical pickup is inclined by 45° to the traveling direction of a beam emitted from a beam source. In the shape variable mirror 6, the four piezoelectric elements 13 are disposed in crossed directions of a supporting substrate 11 and two piezoelectric elements 13 disposed in each direction of the crossed directions are point symmetrical. When a direction vertical to the beam and the other direction of the crossed directions are defined as directions X and Y, respectively, the piezoelectric elements 13 are disposed so that the ratio of the curvature in the direction X to the curvature in the direction Y of the mirror surface of the shape variable mirror 6 is 1:2 when the piezoelectric elements 13 are driven by the same potential. <P>COPYRIGHT: (C)2007,JPO&INPIT |
