Optical head apparatus and optical disc apparatus

Details Optical head apparatus and optical disc apparatus Optical head apparatus and optical disc apparatus

2011-08-09

2011-08-09

Tran, Thang V (Department: 2627)

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

C369S094000, C369S112050

Reexamination Certificate

active

07995433

ABSTRACT:
In an optical head apparatus and an optical disc apparatus which can reduce influence of interlayer stray light on a differential push-pull signal without making the configuration complicated, Uy=Ty×N1is satisfied, where Tydenotes a length in the y-direction of one period of an interference fringe which is formed on the photodetector9by reflected light of the zero-order diffracted light by an information recording surface other than the access-target information recording surface, reflected light of the positive-first-order diffracted light by the information recording surface other than the access-target information recording surface, and reflected light of the negative-first-order diffracted light by the information recording surface other than the access-target information recording surface, N1denotes a positive integer, and Uydenotes each length in the y-direction of the divisional light-receiving elements9e,9f,9g, and9h. Furthermore, Vy=(Ty/2)×{N2−(½)} is satisfied, where N2denotes a positive integer and Vydenotes a distance to a division line of the divisional light-receiving elements9gand9hand a distance to a division line of the divisional light-receiving elements9eand9f, from a center of a main-beam light-receiving unit9M.

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