Optical pickup apparatus, optical disc apparatus, and...

Details Optical pickup apparatus, optical disc apparatus, and... Optical pickup apparatus, optical disc apparatus, and...

2006-08-29

2006-08-29

Tran, Thang V. (Department: 2627)

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

C369S044370

Reexamination Certificate

active

07099243

ABSTRACT:
After making such adjustment that an a main push-pull signal MPP offset can be made zero when a main beam is positioned at the center of a main photoreceptor, using electric signals E and F photoelectrically converted by one of two two-divided side beam photoreceptors and electric signals H and G photo-electrically converted by the other thereof, a side push-pull signal SPP including a constant α is determined for allowing respective (F−αE) and (αH−G) offsets to be made zero and is calculated according to the formula, SPP−(F−αE)+(αH−G). From this SPP signal and the main push-pull signal MPP, a differential push-pull signal DPP is then calculated, thereby allowing stable tracking control to be carried out, even during recording.

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patent: 2005/0286360 (2005-12-01), Nakao
patent: 9-288831 (1997-11-01), None

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