Variable focus liquid lens with reduced driving voltage

Details Variable focus liquid lens with reduced driving voltage Variable focus liquid lens with reduced driving voltage

2007-12-25

2007-12-25

Sugarman, Scott J. (Department: 2873)

Optical: systems and elements

Lens

Fluid

Reexamination Certificate

active

11331194

ABSTRACT:
The invention provides a variable focus liquid lens using electrowetting, comprising a conductive first liquid and an insulating second liquid. At least one of the first liquid composed of electrolyte and the second liquid composed of insulating liquid contains a surfactant for reducing interfacial energy between the first and second liquids. An interfacial portion between the first and second liquids is gathered by surfactant to reduce driving voltage. The variable focus liquid lens according to the invention has about 50% lower driving voltage required for changing focus, ensuring stability of the two fluids.

REFERENCES:
patent: 6369954 (2002-04-01), Berge et al.
patent: 2002/0176148 (2002-11-01), Onuki et al.
patent: 2006/0215273 (2006-09-01), Kuiper et al.
patent: 2000-347005 (2000-12-01), None
patent: WO 00/58763 (2000-10-01), None
patent: WO 2004/099846 (2004-11-01), None
Chinese Office Action, with English Translation, issued in corresponding Chinese Patent Application No. 2006100011478, dated on Apr. 6, 2007.
French Search Report issued in corresponding application No. FR 0600340, dated May 2, 2007.

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