OPTICAL PICKUP AND OPTICAL DISK DEVICE

摘要

PROBLEM TO BE SOLVED: To provide an optical pickup which corrects a change in emission light intensity from an object lens produced by spherical aberration correction to each information recording surface of a multilayer disk.

SOLUTION: Spherical aberration correction means (a collimate lens 105, lens moving means 119) corrects spherical aberration corresponding to a position on an information recording surface 114 of an optical disk 113. A transmittance variable element 110 as light intensity correction means corrects a change in emission light intensity from an object lens 112 accompanying spherical aberration correction of the spherical aberration correction means. A pickup control circuit 121 controls transmittance of the transmittance variable element 110 according to a position of the information recording surface 114 or a moving amount of the collimate lens 105.

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