Zoom flash with variable focus lens

Details Zoom flash with variable focus lens Zoom flash with variable focus lens

2007-11-20

2007-11-20

Perkey, W. B. (Department: 2862)

Photography

Flash system responsive to focal length or distance

Illumination angle responds to focal length or distance

C396S175000, C396S182000

Reexamination Certificate

active

10929820

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 (26) and a variable focus lens (24, 40), the variable focus lens (24, 40) having a first and a second fluid (42, 44) in a chamber (36, 46), the fluids (42, 44) having different indices of refraction and being non-miscible and in contact over an interface surface (54) with variable shape. An electrode (50) applies a variable voltage potential within the chamber (36, 46) for shaping the interface surface (54) according to the zoom focus setting.

REFERENCES:
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patent: 5438486 (1995-08-01), McNair
patent: 5602605 (1997-02-01), Lierle
patent: 5666564 (1997-09-01), Albrecht
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patent: 6369954 (2002-04-01), Berge et al.
patent: 6598986 (2003-07-01), Yano
patent: 6891679 (2005-05-01), Atarashi et al.
patent: 2002/0009297 (2002-01-01), Tanabe
patent: 2004/0037549 (2004-02-01), Yano
patent: WO 03/069380 (2003-08-01), None

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