| 摘要 |
An optical pickup 4 that converts the reflected light from a laser light irradiated onto a disc into an electrical signal, is provided with an objective lens 42 that performs the irradiation of the laser light and reception of the reflected light and a biaxial actuator 43 that drives the objective lens 42. There are provided a focusing error signal detection unit 52 that detects the drive signal of the actuator using the electrical signal from the optical pickup 4, an actuator drive unit 56 that controls drive of the biaxial actuator 43 such that the objective lens 42 performs a focus pull-in action, using the drive signal, a focus gain setting section that sets the focus gain of the drive signal and a focus gain adjustment unit 54 that clips a drive signal waveform.
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