Recording medium having track formed of land portion and groove

Dynamic information storage or retrieval – With servo positioning of transducer assembly over track... – Optical servo system

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369 4426, 3692753, 3692754, G11B 700

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active

060552182

ABSTRACT:
An optical reproducing apparatus according to the present invention includes a land/groove switching circuit for alternately switching reproduction of a record mark on a groove portion and a land portion. This allows a tracking operation to be carried out continuously at a connection point to a subsequent track in the recording direction without a laser beam from an optical pickup passing through an end of a spiral track. A recording medium according to the present invention includes a recording track formed of a groove portion and a land portion, and a record mark used for switching a tracking operation so that a light beam emitted from the optical pickup should be irradiated alternately on the groove portion and the land portion. When the record mark is detected, a track jump operation is carried out, and information is reproduced from the groove portion and the land portion alternately.

REFERENCES:
patent: 5422874 (1995-06-01), Birukawa et al.
patent: 5566141 (1996-10-01), Yamaguchi et al.
Patent Abstracts of Japan, JP 6-084172 Published Mar. 25, 1994, Matsushita Electric Inc. Co. Ltd.
Patent Abstracts of Japan, JP-8-111036 Published Apr. 30, 1996, Fuji Xerox Co. Ltd.
Patent Abstracts of Japan, JP 8-096417 Published Apr. 12, 1996, NEC Corp.

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