Variable aperture

Details Variable aperture Variable aperture

2007-07-23

2008-08-05

Phan, James (Department: 2872)

Optical: systems and elements

Light control by opaque element or medium movable in or...

Fluid

C359S227000

Reexamination Certificate

active

07408691

ABSTRACT:
A variable aperture includes a chamber, a transparent and electrically conductive aqueous solution, an opaque and electrically non-conductive oily solution, a transparent insulative and hydrophobic layer, a first electrode and a second electrode assembly. The chamber includes a first transparent portion and a second transparent portion located on opposite sides. The aqueous solution and the oily solution are contained in the chamber thus forming a contact interface therebetween. The transparent insulative and hydrophobic layer is arranged between the oily solution and the second transparent portion. The first electrode is arranged electrically contacting the aqueous solution. The second electrode assembly is arranged adjacent to the second transparent portion, and includes a transparent circular electrode and a plurality of concentric transparent annular electrode surrounding the transparent circular electrode, the circular electrode being insulated from the annular electrode.

REFERENCES:
patent: 5181016 (1993-01-01), Lee
patent: 5302988 (1994-04-01), Nanjo
patent: 2005/0128370 (2005-06-01), Moon

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