Optical disk and reproducing apparatus including a focus...

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

G - Physics

11

B

G11B 7/005 (2006.01) G11B 7/0037 (2006.01) G11B 7/085 (2006.01) G11B 7/09 (2006.01) G11B 7/24 (2006.01) G11B 7/00 (2006.01)

Patent

CA 2162962

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.

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