Optical information recording medium

Details Optical information recording medium Optical information recording medium

1994-07-15

1997-06-10

Neyzari, Ali

Dynamic information storage or retrieval

Storage medium structure

Optical track structure

369 4426, 3692754, G11B 700, G11B 724

Patent

active

056383541

ABSTRACT:
In a control method of an optical disk unit, it is judged by performing a tentative tracking operation of an optical pickup in a constant region of an optical disk whether a tracking position of the optical pickup is located in a land or groove portion. After a correct tracking control condition is judged, an access operation according to command information is executed. The optical disk unit has a two-divisional light receiving element for receiving diffracted light caused by a pregroove and a prepit of the optical disk, and a differentiator for generating a difference signal between signals of this light receiving element. The optical disk unit further has an adder for generating a sum signal of the signals of the light receiving element, and a tracking signal selector for selecting the difference or sum signal when the tracking operation is performed in a pregroove or prepit region, respectively. An optical information recording medium and a method for recording and regenerating information by using this optical information recording medium are also shown.

REFERENCES:
patent: 5128916 (1992-07-01), Ito et al.
patent: 5295131 (1994-03-01), Ishibashi et al.
patent: 5402411 (1995-03-01), Maeda et al.
patent: 5404345 (1995-04-01), Taki

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