Variable transparency electro-optical device
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United States of America Patent
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Mar 4, 1997
Issued Date -
N/A
app pub date -
Jul 11, 1995
filing date -
Nov 5, 1991
priority date (Note) -
Expired
status (Latency Note)
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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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