Magneto-optic image scanning detector

Facsimile and static presentation processing – Facsimile – Recording apparatus

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358236, 350356, H04N 310, G02F 109

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active

045743126

ABSTRACT:
An improved magneto-optic image scanning detector for placement in a light beam between an image and a light detector generating an electrical signal as a function of the intensity of light impinging thereof. The signal-to-noise ratio is increased by mounting two chips of identical configuration in adjacent aligned relationship and scanning them in patterns whereby the light-blocking effect of non-selected areas is increased. Additionally, logic is provided in the driving circuit to alternate the current direction within the selected area to open and close each selected area during its portion of the scan pattern at a predetermined rate whereby the light beam passing therethrough is pulsated. A discriminator is added in line with the electric signal generated by the detector to produce an output as a function only of the pulsating portion whereby the d.c. background light is eliminated.

REFERENCES:
patent: 3938878 (1976-02-01), Fox
patent: 4051465 (1977-09-01), Brody
patent: 4389096 (1983-06-01), Hori
A Method of Matrix Addressing Polarization Rotating or Retarding Light Valve Arrays, by G. Taylor, Proceedings of the IEEE, vol. 58, No. 11, Nov. 1970, pp. 1812-1817.
X-Y Addressing Methods for Iron-Garnet Display Components, by B. Hill, IEEE Transactions on Electron Devices, vol. ED-27, No. 9, Sep. 1980, pp. 1825-1834.

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