Optical projection device and an optical reader incorporating th

Details Optical projection device and an optical reader incorporating th Optical projection device and an optical reader incorporating th

1976-08-30

1977-07-26

Bauer, Edward S.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

1791003V, 350150, 350175DR, 350180, 358128, G02F 113

Patent

active

040379299

ABSTRACT:
This invention relates to a projection device of which the optical device having a focal length is variable under the effect of an electrical signal and comprises a hollow transparent lens into which a liquid nematic crystal is introduced. Under the effect of the electrical signal applied between two transparent electrodes respectively arranged on the two inner surfaces of the lens, the index of the liquid crystal for the direction of incidence of the projected beam is capable of varying as a result of the oscillation of the molecules of the liquid crystal, the position of the focussing point of the projected beam varying in consequence.

REFERENCES:
patent: 3309162 (1967-03-01), Kosanke et al.
patent: 3424513 (1969-01-01), Lotspeich
patent: 3857629 (1974-12-01), Freiser
Schnur et al., "Prospectus for the Development of Liquid Crystal Waveguides", NRL Report, No. 7507, Nov. 10, 1972.

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