Extended thin film light modulator/scanner

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

G - Physics

03

G

314/26

G03G 15/00 (2006.01) G02F 1/03 (2006.01) G02F 1/035 (2006.01) G02F 1/295 (2006.01) H04N 1/036 (2006.01) H04N 1/192 (2006.01)

Patent

CA 1184589

-1- ABSTRACT OF THE DISCLOSURE 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.

391762

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