Zoom flash with liquid crystal lens

Details Zoom flash with liquid crystal lens Zoom flash with liquid crystal lens

2007-04-03

2009-11-10

Blackman, Rochelle-Ann J (Department: 2862)

Photography

With object illumination for exposure

Variable illumination angle

C359S666000, C362S017000, C362S018000, C362S019000, C362S355000

Reexamination Certificate

active

07616881

ABSTRACT:
A camera apparatus (10) has a zoom lens (12) having a zoom focus setting that is adjustable over a range of focus values and control circuitry for generating a variable voltage potential according to the zoom focus setting. A flash illumination apparatus (20) has a light source (32) and a variable focus liquid crystal lens (24), the variable focus liquid crystal lens (24) having a first and a second solid optical element (40, 50), chamber (44), the two electrodes (42, 48) and liquid crystal material (46). A variable voltage is applied to the liquid crystal material (46) for the lens power according to the zoom focus setting.

REFERENCES:
patent: 5666564 (1997-09-01), Albrecht
patent: 6278845 (2001-08-01), Terada
patent: 6598986 (2003-07-01), Yano
patent: 7382976 (2008-06-01), Mok et al.
patent: 2002/0009297 (2002-01-01), Tanabe
patent: 2004/0037549 (2004-02-01), Yano
Hongwen Ren, et al, “Tunable-focus flat liquid crystal spherical lens”. Applied Physics Letter, vol. 84, No. 23, pp. 4789-4791.
Hongwen Ren, et al, “Tunable-focus cylindrical liquid crystal lens”, Japanese Journal of Applied Physics vol. 43, No. 2, 2004, pp. 243-244.
Hongwen Ren, et al, “Adaptive liquid crystal lens with large focal length tunability”, Optics Express, vol. 14, No. 23, pp. 11292-11298.

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