Optical device and optical disc apparatus utilizing the...

Details Optical device and optical disc apparatus utilizing the... Optical device and optical disc apparatus utilizing the...

2005-12-26

2010-11-23

Young, Wayne R (Department: 2627)

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

C369S112010, C369S112030, C369S112050, C369S112150, C369S112100

Reexamination Certificate

active

07839733

ABSTRACT:
A signal, which is derived from the relationship between the lens shift amount of an objective lens and the amount of the positional-deviation, of a received light beam with respect to a light-receiving plane, which occurs in the tangential direction on a photodetector, is corrected by an offset caused by asymmetry in the intensity distribution of reflected light; a multiplication value is obtained by multiplying the corrected signal by a predetermined constant; based on a focus error signal obtained by subtracting the calculated value from the calculation expression according to the conventional astigmatism method, the focusing servo control is performed.

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