Liquid crystal cells – elements and systems – Liquid crystal system – Liquid crystal for recording or imaging on photosensitive...
Reexamination Certificate
2006-01-04
2008-09-09
Healy, Brian M (Department: 2883)
Liquid crystal cells, elements and systems
Liquid crystal system
Liquid crystal for recording or imaging on photosensitive...
C349S187000, C349S084000, C349S085000, C349S093000
Reexamination Certificate
active
07423700
ABSTRACT:
Provided are an aberration-compensating liquid crystal device, a method of manufacturing the same, an optical pickup including the liquid crystal device, and an optical recording and/or reproducing apparatus employing the optical pickup. The method of manufacturing an aberration-compensating liquid crystal device comprises: positioning a gray scale mask having an absorption rate distribution corresponding to that of aberrations to be corrected on a liquid crystal cell containing a mixture of liquid crystals and monomers injected between a pair of transparent substrates; and irradiating the liquid crystal cell on which the gray scale mask has been positioned with UV light so that the monomers undergo photopolymerization into polymer and phase separation into a polymer-existing region and a liquid crystal-existing region, thereby forming a liquid crystal layer having a phase difference distribution corresponding to that of aberrations to be corrected.
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Office Action issued in Korean Patent Application No. 2005-821 on May 9, 2006.
Choi Woo-seok
Kim Hee-kyung
Kim Tae-kyung
Healy Brian M
Stein, McEwen & Bui LLP
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