Dynamic information storage or retrieval – Condition indicating – monitoring – or testing – Including radiation storage or retrieval
Reexamination Certificate
2011-01-11
2011-01-11
Edun, Muhammad N (Department: 2627)
Dynamic information storage or retrieval
Condition indicating, monitoring, or testing
Including radiation storage or retrieval
C369S112020, C369S112010, C369S044370
Reexamination Certificate
active
07869321
ABSTRACT:
An optical disk discriminating method and an optical disk device which can detect reflected rays for making discrimination among kinds of optical disks with high accuracies. By switching a plurality of lasers and moving a spherical aberration corrector while moving an objective lens to cause it to approach or keep away from an optical disk, rays reflected light from the optical disk can be detected with high accuracies. Discrimination among the kinds of a plurality of optical disks can be made on the basis of signals generated from the detected reflected rays. This ensures that the kind of an optical disk can be determined through one operation of sweeping.
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Kataoka Takeyoshi
Suzuki Motoyuki
Edun Muhammad N
Hitachi , Ltd.
Hitachi-LG Data Storage, Inc.
Townsend and Townsend / and Crew LLP
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