Optical disc recording and/or reproducing apparatus and...

Dynamic information storage or retrieval – Condition indicating – monitoring – or testing – Including radiation storage or retrieval

Reexamination Certificate

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C369S044230, C369S112020, C369S121000, C369S123000

Reexamination Certificate

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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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patent: 6151154 (2000-11-01), Ogasawara et al.
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patent: 08212583 (1996-08-01), None
patent: 08321065 (1996-12-01), None
Electronic Translation of JP 08-321065.
Electronic Translation of JP 08-212583.
Patent Abstracts of Japan, JP 2000-067453 A, Mar. 3, 2000.

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