Optical control circuit for electrochromic layers

Details Optical control circuit for electrochromic layers Optical control circuit for electrochromic layers

1982-10-15

1985-07-16

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

350357, G01J 120

Patent

active

045298734

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.

REFERENCES:
patent: 3000262 (1961-09-01), Rabinow et al.
patent: 4229648 (1980-10-01), Ehrenhaft
patent: 4298870 (1979-10-01), Saegusa
patent: 4342906 (1982-08-01), Hyatt
patent: 4384200 (1983-05-01), Taira

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