Dynamic information storage or retrieval – Condition indicating – monitoring – or testing – Including radiation storage or retrieval
Patent
1996-02-21
1997-11-04
Tran, Thang V.
Dynamic information storage or retrieval
Condition indicating, monitoring, or testing
Including radiation storage or retrieval
G11B 700
Patent
active
056847718
ABSTRACT:
An optical recording medium discriminating apparatus discriminates at least two types of optical recording media having pits of different depths carrying recorded information. A light beam of a predetermined wavelength is caused to be incident to an optical recording medium, the amount of returning light therefrom is detected, and a read signal according to the detected amount of returning light is produced. The amounts of light in two areas, line-symmetrical to each other in the tangential direction of a track consisting of a sequence of pits, are detected from the amount of returning light, and a push-pull signal corresponding to a difference between the amounts of light in the two areas is produced. A phase difference between the read signal and the push-pull signal is detected, to discriminate the type of the optical recording medium is discriminated. In another optical recording medium discriminating apparatus, the amounts of light in two areas, line-symmetrical to each other in the tangential direction of a track consisting of a sequence of pits, are detected from the amount of returning light from the optical recording medium, and a push-pull signal corresponding to a difference between the amounts of light in the two areas is produced. The level of the push-pull signal is compared with a reference level, to discriminate the type of the optical recording medium.
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Araki Yoshitsugu
Furukawa Jun-ichi
Pioneer Electronic Corporation
Tran Thang V.
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