Extended thin film light modulator/scanner

Details Extended thin film light modulator/scanner Extended thin film light modulator/scanner

1981-01-12

1983-12-20

Sikes, William L.

350358, 350 9614, G02F 103

Patent

active

044213875

ABSTRACT:
A thin film light modulator (50) for use in an electro-optic line printer (11). A light valve utilizes a thin electro-optic film (54) on a substrate (52) with the index of refraction of the film being higher than the substrate so that the light can be guided in it. A laser beam (48) is caused to be guided in the film, the beam expanding sideways so that a sheet of collimated light is provided. This light is guided beneath an array of electrodes (58), consisting of an extended set of individually addressed metal fingers (60a, 60n)-(62a, 62n). The light diffracted by the electrode set is reimaged onto the recording medium (14), with the zero order diffracted light blocked out, so that each electrode pair acts as a light modulator for one picture element on the output. Alternatively, the zero order is reimaged and the higher order diffraction components are blocked out. By applying each bit of a serial stream of data to the corresponding electrode, a line recording is achieved.

REFERENCES:
patent: 3810688 (1974-05-01), Ballman et al.
patent: 3877781 (1975-04-01), Kaminow
patent: 3877782 (1975-04-01), Kaminow
patent: 3990775 (1976-11-01), Kaminow et al.
patent: 4054362 (1977-10-01), Baues
patent: 4106848 (1978-08-01), Conwell et al.
patent: 4111523 (1978-09-01), Kaminow et al.
"Gorrelator Based on an Integrated Optical Spatial Light Modulator" by Verber et al., App. Optics., vol. 20, No. 9; May 1, 1981.

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