Optical pickup and optical disc apparatus

Details Optical pickup and optical disc apparatus Optical pickup and optical disc apparatus

2011-06-21

2011-06-21

Tran, Thang V (Department: 2627)

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

C369S044240, C369S044410, C369S044230

Reexamination Certificate

active

07965594

ABSTRACT:
When recording/reproducing an optical disc having a recording layer of multi-layer structure, an unwanted optical beam reflected from a recording layer other than a target layer for recording/reproduction is incident on a photodetector to cause an unwanted disturbance component to leak to a detection signal, giving rise to a degradation in the quality of a tracking control signal. In an optical pickup apparatus, for suppression of the degradation, an optical element is mounted having a diffraction area for diffracting part of the optical beam and light receiving planes for sub-optical beams are provided each of which has a light shielding zone or dead zone of a predetermined width on its central sectioning line.

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U.S. Appl. No. 11/734,817, filed Apr. 13, 2007, Toshiteru Nakamura, et al., Hitachi Media Electronics Co., Ltd.

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