Document information detecting device for a copying machine

Details Document information detecting device for a copying machine Document information detecting device for a copying machine

1991-06-10

1993-03-30

Pendegrass, Joan H.

Photocopying

Contact printing

Light boxes

355311, 355 75, G03G 1500

Patent

active

051988593

ABSTRACT:
The invention provides an apparatus for detecting an image on a document for use in a copying machine. A scanner scans the document and photoelectrically reads the image to generate a first analog signal representing a size of the document and a second analog signal representing an image density of the image. A central processing unit processes the first and second analog signals to determine the size and the image density of the document. The central processing unit includes an input port for receiving both of the first and second analog signals and a switch for selectively inputting one of the first and second analog signals at a time into the input port.

REFERENCES:
patent: 4222105 (1980-09-01), Shimizu et al.
patent: 4372674 (1983-02-01), Yukawa et al.
patent: 4456372 (1984-06-01), Yamauchi
patent: 4474453 (1984-10-01), Yanagawa et al.
patent: 4673282 (1987-06-01), Sogame
patent: 5032867 (1991-07-01), Nagata et al.

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