Optical disc drive apparatus, information reproducing or...

Details Optical disc drive apparatus, information reproducing or... Optical disc drive apparatus, information reproducing or...

2007-07-31

2007-07-31

Hindi, Nabil (Department: 2627)

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

C369S112020, C369S044320

Reexamination Certificate

active

10914194

ABSTRACT:
Disclosed here is a method for solving a conventional problem that no spherical aberration signal can be detected from any push-pull signal that is easy to adjust an object photodetector when a differential push-pull signal is obtained. To achieve the above object, sub-beams used to detect a differential push-pull signal are defocused from the main beam and spherical aberration signals are detected and the compensation of the spherical aberration is started while tracking controlling is off and detection of spherical aberration signals is held while the tracking controlling is on. The present invention can thus obtain both of the spherical aberration signal and the differential push-pull signal at the same time with use of the conventional detection system.

REFERENCES:
patent: 6400664 (2002-06-01), Shimano et al.
patent: 7142484 (2006-11-01), Ando et al.
patent: 2003/0053393 (2003-03-01), Shimano et al.
patent: 2001-307349 (2001-11-01), None
patent: 2001-351255 (2001-12-01), None
patent: 2003-123282 (2003-04-01), None

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