Dynamic information storage or retrieval – Condition indicating – monitoring – or testing – Including radiation storage or retrieval
Reexamination Certificate
2007-09-17
2010-11-30
Nguyen, Hoa T (Department: 2627)
Dynamic information storage or retrieval
Condition indicating, monitoring, or testing
Including radiation storage or retrieval
Reexamination Certificate
active
07843788
ABSTRACT:
An optical recording medium driving device includes an optical head, an evaluation signal generating section, a focus servo section, a spherical aberration correction section, a focus bias adjuster, and a system controller. The optical head has a focus servo mechanism and a spherical aberration correction mechanism, irradiates a laser light, and detects a reflected light. The evaluation signal generating section generates, based on the reflected light, an evaluation signal. The focus servo section drives the focus servo mechanism according to a focus error signal to perform focus servo. The spherical aberration correction section drives the spherical aberration correction mechanism to perform spherical aberration correction. The focus bias adjuster adds focus bias to a focus loop. The system controller performs an operation for setting an adjustment spherical aberration correction value.
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U.S. Appl. No. 11/849,520, filed Sep. 4, 2007, Nishino.
Fischer Mark L
Nguyen Hoa T
Oblon, Spivak McClelland, Maier & Neustadt, L.L.P.
Sony NEC Optiarc Inc.
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