| 摘要 |
A liquid crystal optical device (liquid crystal lens) is located along the optical axis of one of two laser beams emitted by an optical pickup. The two laser beams (20,22), which are respectively modulated using a recording pulse and a drawing pulse, are coaxially emitted through the objective lens (18) of the optical pickup, while the focal points are shifted in the light axial direction. A drawing layer (26) and a data recording layer (36) are laminated on an optical disk (12), and by controlling voltages applied to the liquid crystal optical device, the distance between the focal positions of the two beams is adjusted so that the distance equals the distance between the two layers. While this adjusted state is maintained, one of the laser beams is focused on one of the layers by a focusing actuator, and data recording and drawing are simultaneously performed.
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