Optical disc device

Details Optical disc device Optical disc device

2007-03-19

2011-10-25

Young, Wayne (Department: 2627)

Dynamic information storage or retrieval

Condition indicating, monitoring, or testing

Including radiation storage or retrieval

C369S112010, C369S112030, C369S112050, C369S112060, C369S112150

Reexamination Certificate

active

08045432

ABSTRACT:
Light emitted from a radiation light source1passes through a diffraction grating3aand is separated into transmitted light a and +1st/−1st order diffracted lights b, c. These lights are collected through an objective lens7on tracks of an optical disc8in a partially overlapped state. Light reflected by the tracks passes through the objective lens7and is incident upon light diverging means13a. Subsequently, light corresponding to the transmitted light “a” diverges into two light beams that are respectively incident upon light detection regions A1, A2, light corresponding to the diffracted lights “b” and “c” respectively diverges into two light beams that are respectively incident upon light detection regions B1, B2, and C1, C2. A tracking error signal associated with the tracks of the optical disc8is generated by combining signals detected in the light detection regions A1, A2, B1, B2, C1, and C2.

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