Dynamic information storage or retrieval – Condition indicating – monitoring – or testing – Including radiation storage or retrieval
Reexamination Certificate
2006-06-27
2006-06-27
Patel, Gautam R. (Department: 2656)
Dynamic information storage or retrieval
Condition indicating, monitoring, or testing
Including radiation storage or retrieval
C369S044230, C369S112020, C369S121000, C369S123000
Reexamination Certificate
active
07068576
ABSTRACT:
The astigmatic aberration in an optical system is to be adjusted. Specifically, in an optical disc device on which can be selectively loaded a first optical disc having a first index of double refraction or a second optical disc having a second index of double refraction larger than said first index of double refraction, and which includes a liquid crystal device31between a light source11and an objective lens15converging a light beam radiated from said light source on the optical disc2loaded on the optical disc device, the voltage applied to the liquid crystal device31is adjusted to correct the coma aberration or the astigmatic aberration for the first disc or the second disc, respectively.
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Electronic Translation of JP 08-321065.
Electronic Translation of JP 08-212583.
Patent Abstracts of Japan, JP 2000-067453 A, Mar. 3, 2000.
Oblon & Spivak, McClelland, Maier & Neustadt P.C.
Ortiz-Criado J. L.
Patel Gautam R.
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