G - Physics – 02 – F
Patent
G - Physics
02
F
310/3, 40/39
G02F 1/01 (2006.01)
Patent
CA 1189557
- 1 - Abstract: An electrically operated light control device includes an electrostatically actuated element that comprises, in superposition, a stationary electrode, an electrode move- able between a position overlying the stationary electrode and a position removed from the stationary electrode, and a non-conductive element between the electrodes for keeping the electrodes electrically separated. The moveable electrode is in the form of a sheet of flexible material having one end fixed with respect to the stationary electrode and the opposite end free with respect to the stationary electrode. This sheet of flexible material has a permanent stress which biases the sheet into a curl away from the stationary electrode. The element is characterized by the fact that the non-conductive element comprises a sheet of electret material that is capable of retaining an electrostatic charge to provide an electrostatic force to act on the moveable electrode. The element is actuated by the resultant sum of the electrostatic force provided by the electret material and the electrostatic force created when an electrical potential is applied to the electrodes.
457805
Bos-Knox Ltd.
Kirby Eades Gale Baker
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