04529873 is referenced by 159 patents and cites 5 patents.

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.

Title
Optical control circuit for electrochromic layers
Application Number
6/434715
Publication Number
4529873
Application Date
October 15, 1982
Publication Date
July 16, 1985
Inventor
Erwin Wiedmann
Essingen
DE
Horst Ballmer
Heidenheim
DE
Agent
Hopgood Calimafde Kalil Blaustein & Judlowe
Assignee
Carl Zeiss Stiftung Heidenheim Brenz
DE
IPC
G01J 1/20
View Original Source