Document scanning head

Details Document scanning head Document scanning head

1978-06-08

1980-02-19

Britton, Howard W.

Facsimile and static presentation processing

Facsimile

Recording apparatus

358213, 358293, H04N 112

Patent

active

041897536

ABSTRACT:
A scanning device for use in a facsimile system is formed on a semiconductor substrate. The substrate has an array of apertures, the boundary of each aperture presenting a pn junction which functions as a photodetector when appropriate bias is applied through sensing and addressing circuits. A light is directed through the apertures from one side of the substrate to be incident on a document located against the other side. The boundaries of the apertures are contoured so that the photodetectors intercept light reflected from the document but are shielded from direct light. In use, the document and the scanning device are slid past one another at a rate commensurate with the rate of operation of the addressing circuit.

REFERENCES:
patent: 3544713 (1970-12-01), Case
patent: 3603730 (1971-09-01), Weigl
patent: 3676586 (1972-07-01), Uno
patent: 3947627 (1976-03-01), Tanaka

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