Dynamic information storage or retrieval – Specific detail of information handling portion of system – Radiation beam modification of or by storage medium
Patent
1998-02-26
2000-09-19
Tran, Thang V.
Dynamic information storage or retrieval
Specific detail of information handling portion of system
Radiation beam modification of or by storage medium
369 47, G11B 700
Patent
active
061222437
ABSTRACT:
A tracking groove comprising a land area and a groove area is previously provided on a substrate of an optical disk, and a prepit is previously provided on a boundary line between the land area and the groove area of the tracking groove. When information is recorded on both the land and groove areas, a half-split photodetector split into two parts by a splitting line perpendicular to the radial direction of the optical disk is used as a photoreceiver for receiving light reflected from the optical disk. The photoreceivers are switched so that light reflected from the prepit is reproduced as a signal in any one of the two photodetectors. This enables reproduction signals derived from light reflected from the prepit to be reproduced at a good S/N ratio, thus realizing an optical information recording apparatus which bas a simple construction and enables information to be recorded on both the land and groove areas.
REFERENCES:
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patent: 5650992 (1997-07-01), Ohkubo
patent: 5872767 (1999-02-01), Nagai et al.
K. Kayanuma et al., "High track density magneto-optical recording using a crosstalk canceler", pp. 35-39, The International Society for Optical Engineering, vol. 1316 Optical Data Storage, Mar. 5-7, 1990.
NEC Corporation
Tran Thang V.
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