Optical disk and reproducing apparatus including a focus search

Details Optical disk and reproducing apparatus including a focus search Optical disk and reproducing apparatus including a focus search

1996-11-13

1998-08-11

Tran, Thang V.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 4429, 369 4435, 369 94, G11B 709

Patent

active

057937206

ABSTRACT:
When an optical disk having a plurality of recording layers is loaded, in which layer-number data is recorded on the recording layer nearest to the signal reading plane and layer I.D. data is recorded on each recording layer, a pickup reads the data recorded on each recording layer. A focus error signal is produced by a quartered detector by using return light from the pickup. A focus search drive circuit generates a focus drive signal. When focalization on a desired recording layer is established during focus search by the focus search drive circuit, the focus search drive circuit is stopped.

REFERENCES:
patent: 5060215 (1991-10-01), Kawamura et al.
patent: 5263011 (1993-11-01), Maeda et al.
patent: 5408453 (1995-04-01), Holtslag et al.
patent: 5428597 (1995-06-01), Satoh et al.

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