Frequency controllable optical device

Details Frequency controllable optical device Frequency controllable optical device

1992-02-03

1993-11-30

Sikes, William L.

Optical: systems and elements

Holographic system or element

Using a hologram as an optical element

359 38, G02F 1133

Patent

active

052670678

ABSTRACT:
An optical cell having an optically active material, for example a liquid crystal is disclosed, the transparency of which is a function of the electrical voltage applied together with a control circuit, wherein said optically active material presents an electrical impedance variable with the frequency of the signal applied and said control circuit has a voltage source and means for controlling the frequency of the signal delivered by said voltage source. The cell has applications in attenuating light, notably in a sun screen or automobile rear-view mirror.

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patent: 3694053 (1972-09-01), Kahn
patent: 3907405 (1975-09-01), Fukai et al.
patent: 4109241 (1978-08-01), Shanks
patent: 4200361 (1980-04-01), Malvano et al.
patent: 4370647 (1983-01-01), Brantingham
patent: 4690508 (1987-09-01), Jacob
patent: 4745433 (1988-05-01), Fujimura et al.
patent: 4820933 (1989-04-01), Hong et al.
patent: 5029983 (1991-07-01), Sakayori et al.

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