Optical disk having an index mark

Details Optical disk having an index mark Optical disk having an index mark

1981-12-16

1992-06-02

Psitos, Aristotelis

Dynamic information storage or retrieval

Storage medium structure

Optical track structure

369 50, 369 52, G11B 724, G11B 700

Patent

active

051193639

ABSTRACT:
In an optical recording disk having groove-like guide tracks, a rotation index mark is provided to indicate a rotation starting point where the rotation index mark is constructed of a grooved-like phase structure. The rotation index mark may be formed in a track which is located separated from the information recording tracks, and may be detected optically without using a laser light beam. The rotation index mark is used to control the rotation of the disk as well as writing and reading operation of an optical disk recording/reproducing apparatus so that various information, such as video signals, can be accurately recorded and reproduced. In the case of recording digital signals, the guide tracks may be divided into a plurality of sector regions, and sector index marks corresponding to respective sector regions may also be formed together with the rotation index mark. Furthermore, an address index mark indicative of the position of track address region radially formed in the guide tracks may also be added.

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