Optical pickup apparatus, reproducing apparatus, recording...

Details Optical pickup apparatus, reproducing apparatus, recording... Optical pickup apparatus, reproducing apparatus, recording...

2011-07-12

2011-07-12

Young, Wayne R (Department: 2627)

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

C369S044410

Reexamination Certificate

active

07978590

ABSTRACT:
An optical pickup apparatus, a reproducing apparatus, a recording apparatus, and a tracking error signal generation method are provided. Four light-receiving elements receive stray light of main and sub beams reflected from, out of a plurality of recording layers of the optical disk, the one other than that for effecting recording or reproduction. The four light-receiving elements are disposed individually near every side of the four-part split light-receiving element, of which light-receiving elements are disposed between the two-part split light-receiving elements. Based on stray-light intensity detected by the four light-receiving elements, intensity distribution is calculated for tracking-error signal correction.

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