| 摘要 |
A light receiving unit 20A has a half mirror 20Aa and a photoreceptor device 20Af. A signal processing member 20B generates a focus error signal e from photoelectric conversion signals a, b, c and d which are outputted from the light receiving unit 20A, and further generates a focus error signal e1 from photoelectric conversion signals a1, b1, c1 and d1 which are outputted from a photoreceptor device 7 of an optical pickup P subject to adjustment. A control member 20C performs attitude control on an actuator 5A of an objective lens of the optical pickup P based on the focus error signal e, and creates data for adjusting the optical pickup P based on the focus error signal e1.
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