Optical control circuit for electrochromic layers
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United States of America Patent
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-
Jul 16, 1985
Grant Date -
N/A
app pub date -
Oct 15, 1982
filing date -
Oct 29, 1981
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
In order to regulate the absorptance of an electrochromic layer, the absorptance of the layer is measured optically. The signal derived therefrom is compared with a guide value and fed to a controller which has a dead zone between two hysteresis regions (at switch points), and charges are fed to or removed from the layer as required. Preferred fields of use are lenses, particularly eyeglass lenses, filters and dimmable mirrors to which an electrochromic layer is applied with provision for controlled change of its absorptance.
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