| 摘要 |
In an optical pickup device including light sources for emitting laser light, an objective lens for collecting the laser light emitted from the light sources on a disc surface of an optical disc, a light receiving unit for receiving the reflected light reflected by the disc surface, a collimator lens for correcting spherical aberration of the exit light from the objective lens, a lens driving unit for moving the collimator lens in an optical axis direction, and a control unit for controlling the operation of the lens driving unit based on the output of the light receiving unit, the astigmatism of the exit light from the objective lens is corrected by tilting the collimator lens by a predetermined angle by the lens driving unit.
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