Dynamic information storage or retrieval – Storage medium structure – Optical track structure
Patent
1995-10-04
1998-04-07
Neyzari, Ali
Dynamic information storage or retrieval
Storage medium structure
Optical track structure
3692753, 369 4426, 369 32, G11B 1722, G11B 1724
Patent
active
057373078
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: 5383176 (1995-01-01), Inui et al.
patent: 5402411 (1995-03-01), Maeda et al.
patent: 5404345 (1995-04-01), Taki
patent: 5477524 (1995-12-01), Deguchi et al.
patent: 5557600 (1996-09-01), Horimai
Neyzari Ali
Ricoh & Company, Ltd.
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