Copying machine with capacity to measure transparency of origina

Details Copying machine with capacity to measure transparency of origina Copying machine with capacity to measure transparency of origina

1989-08-17

1991-04-02

Moses, R. L.

Photocopying

Contact printing

Light boxes

355228, 355246, 355311, G03G 1500

Patent

active

050050494

ABSTRACT:
A copying machine of the present invention measures light transmittance of a document so as to adjust copying concentration on the basis of the measured result. The copying concentration is concretely adjusted by adjusting electrification voltage of a photosensitive body, and/or developing bias voltage, and/or quantity of exposure light. The copying machine is free from the occurrence of back image copying when a document is double-faced. A copying machine of the present invention further comprises means for discriminating whether the document is a double-faced one or a single-faced one.

REFERENCES:
patent: 4462681 (1984-07-01), Aerts et al.
patent: 4624547 (1986-11-01), Endo et al.
patent: 4640603 (1987-02-01), Honma
patent: 4702589 (1987-10-01), Ito

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