Liquid crystal cells – elements and systems – Liquid crystal optical element – Liquid crystal lenses other than for eyewear
Reexamination Certificate
2005-11-21
2009-11-17
Sanghavi, Hemang (Department: 2874)
Liquid crystal cells, elements and systems
Liquid crystal optical element
Liquid crystal lenses other than for eyewear
C349S147000, C359S254000
Reexamination Certificate
active
07619713
ABSTRACT:
The present invention is directed to the provision of a liquid crystal optical element that is inexpensive, has an ideal refractive index profile, and functions as a high-performance gradient-index lens. The liquid crystal optical element (100) includes a first planar substrate (101), a second planar substrate (105), a liquid crystal (106) provided between the first and second planar substrates, an electrode pattern (200) formed on one of the first and second planar substrates and having a plurality of regions (201to215) each for varying an effective refractive index for a light beam by a respectively different degree, and a counter electrode (108), formed on the other one of the first and second planar substrates, for applying voltage with respect to the electrode pattern, wherein the refractive index for a light beam varies with the square of the distance from the center of the liquid crystal optical element along a radial direction across the liquid crystal optical element when the voltage is applied between the electrode pattern and the counter electrode.
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Citizen Holdings Co., Inc.
Finnegan Henderson Farabow Garrett & Dunner L.L.P.
Sanghavi Hemang
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