Apparatus for point-by-point reading of documents using photodet

Details Apparatus for point-by-point reading of documents using photodet Apparatus for point-by-point reading of documents using photodet

1983-11-10

1986-08-05

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

358213, H01J 4014

Patent

active

046045279

ABSTRACT:
The invention relates to a point-by-point reading apparatus using a matrix of photodetector elements. The reading apparatus comprises a system of p groups of q basic elements, which are aligned, each of these basic elements being constituted by a photodiode and a diode insensitive to the light radiation and connected in opposition. These basic elements are addressed by an input circuit of the shift register type with p connections, each connected to all the diodes of the same group. The state of the photodiodes is collected in an output circuit with q connections, each connected to all the photodiodes occupying a particular rank in a group.

REFERENCES:
patent: 4064521 (1977-12-01), Carlson
patent: 4233506 (1980-11-01), Yamamoto et al.
patent: 4407010 (1983-09-01), Baji et al.
patent: 4499384 (1985-02-01), Segawa et al.

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