| 摘要 |
PROBLEM TO BE SOLVED: To provide an optical pickup device which accurately reads out signals of different signal read-out wavelengths of such optical disks as CD(compact disk) and DVD(digital versatile disk). SOLUTION: A prescribed signal quantity Vth is set at a value which is larger than the signal quantity at the peak of an FES signal at a part in which a waviness is generated. A control is started so that the FES signal is not drawn into 0 at the part where the waviness is generated at a point at which the FES signal does not exceed Vth, and the FES signal is drawn into 0 after a first peak after the FES signal exceeds Vth. |
