Information access apparatus for optical disc having a plurality

Details Information access apparatus for optical disc having a plurality Information access apparatus for optical disc having a plurality

1996-10-01

1997-12-09

Dinh, Tan

Dynamic information storage or retrieval

Information location or remote operator actuated control

Selective addressing of storage medium

369 94, G11B 1722

Patent

active

056967438

ABSTRACT:
An information access apparatus for an optical disc according to the present invention has an optical head transporting device for initiating movement of the laser focusing point to a different plane on an optical disc, and an optical head seek controlling device for radially transporting an optical head to a target track radially of the optical disc while counting tracks on a plane of a predetermined layer of the optical disc. A plane selecting device is provided for selecting the plane having an optimum SN ratio of a tracking signal a maximum amplitude tracking signal, or a maximum amplitude readout signal obtained from each recording layer of the optical disc when retrieving information on the optical disc, and a focus jump controlling device is provided for controlling movement from a plane on which focusing is currently performed to another plane selected by the plane selecting device when an information access command is issued from a host device.

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K. Koumura et al., "High Speed Accessing by Direct Accessing ", Japanese Journal of Applied Physics, vol. 28, Aug. 1989, Supplement 28-3, pp. 73-76 .

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