Optical disk unit, control method thereof, optical information r

Details Optical disk unit, control method thereof, optical information r Optical disk unit, control method thereof, optical information r

1997-09-29

1998-10-13

Edun, Muhammad N.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369109, 3692754, G11B 700

Patent

active

058222863

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.

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