Document detecting apparatus

Details Document detecting apparatus Document detecting apparatus

1986-02-14

1987-04-21

Wintercorn, Richard A.

Photocopying

Projection printing and copying cameras

Detailed holder for original

G03B 2762

Patent

active

046592148

ABSTRACT:
A document detecting apparatus for a copying machine, comprising a photo-sensor having a light projecting device which emits a measuring light from an inside of to an outside of a copying machine through an original glass plate, and a light receiving device which is installed at a position deviated from a path symmetric to an optical axis of said measuring light with respect to a normal line set up on a surface of the original glass plate and which is directed to receive a scattered light produced from the measuring light scattered at a surface of an original document placed on the original glass plate; and a microprocessor which judges whether or not the original document exists according to an intensity of a light measured by said photo-sensor.

REFERENCES:
patent: 4277163 (1981-07-01), Ikesue et al.
patent: 4302098 (1981-11-01), Kan et al.
patent: 4474453 (1984-10-01), Yanagawa et al.
patent: 4540269 (1985-09-01), Nishiyama
patent: 4568181 (1986-02-01), Nishiyama

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