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

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

2006-10-10

2006-10-10

Wellington, Andrea (Department: 2627)

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

C369S044230, C369S044320, C369S053200

Reexamination Certificate

active

07120106

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.

REFERENCES:
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patent: 5859822 (1999-01-01), Inoue et al.
patent: 6151154 (2000-11-01), Ogasawara et al.
patent: 6295256 (2001-09-01), Kimikawa et al.
patent: 6411577 (2002-06-01), Hirose
patent: 6449236 (2002-09-01), Wals et al.
patent: 6480454 (2002-11-01), Wada et al.
patent: 6628589 (2003-09-01), Iwasaki et al.
patent: 6940798 (2005-09-01), Noborimoto et al.
Patent Abstracts of Japan, JP 2000-067453, Mar. 3, 2000.

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