Optical disc device

Details Optical disc device Optical disc device

2011-04-19

2011-04-19

Chow, Van N (Department: 2627)

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

C369S112150

Reexamination Certificate

active

07929386

ABSTRACT:
A focus error signal is generated by a first-order diffracted light diffracted by regions23b,24bon a hologram plane2a, and an offset of a tracking error signal is canceled by first-order diffracted light diffracted by regions21a,22a,23a,24aon the hologram plane2a. Consequently, even when there is an error in the substrate thicknesses of optical discs, jitter of a reproduction signal at a focus control point can be reduced by decreasing the distance between the focus control point and the point where the jitter is minimized.

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