Document size detecting device using a plurality of thresholds

Details Document size detecting device using a plurality of thresholds Document size detecting device using a plurality of thresholds

1996-08-12

1998-09-08

Beatty, Robert

Electrophotography

Document handling

Original

358449, G03G 1500

Patent

active

058059709

ABSTRACT:
A document size detecting device employed in an image forming apparatus for accurately detecting a document size by using two threshold values. The detecting device uses one threshold for a monochrome document, and the other for a color document, or it uses both the thresholds alternately depending on the number of scanning lines completed by an image sensor.

REFERENCES:
patent: 4630127 (1986-12-01), Fuwa
patent: 4713550 (1987-12-01), Anzai et al.
patent: 5016049 (1991-05-01), Onishi et al.
patent: 5041919 (1991-08-01), Yamamoto et al.
patent: 5122833 (1992-06-01), Sato
patent: 5198853 (1993-03-01), Ichihara et al.
patent: 5225688 (1993-07-01), Endo

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