Optical: systems and elements – Optical modulator – Light wave temporal modulation
Patent
1995-07-11
1997-03-04
Healy, Brian
Optical: systems and elements
Optical modulator
Light wave temporal modulation
359265, 359272, 359245, 359614, 359722, 359738, 359 13, 359104, 351 44, G02F 1153, G02C 710
Patent
active
056085672
ABSTRACT:
The invention relates to a variable transparency electro-optical device comprising: at least one lens formed by an electro-optical cell (4) comprising a first plate (6) and a second plate (8) each provided with a control electrode (14, 16) and a sealing frame (10) interposed between the two plates to form a sealed volume enclosing an electro-optical material (12), voltage generating means (18) connected to said electrodes to apply a variable voltage to said material in order to automatically or manually vary the transmission of the cell (4) as a function of the ambient light. According to the invention the cell (4) comprises at least one element (6) charged with a photochromic substance having an absorption that varies in reversible manner as a function of the intensity of the light impinging on said cell. The invention has particular applications in devices for protecting the eyes.
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Asulab S.A.
Healy Brian
LandOfFree
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