Method of automatically adjusting image density in image forming

Details Method of automatically adjusting image density in image forming Method of automatically adjusting image density in image forming

1986-11-05

1987-11-17

Wong, Peter S.

Photocopying

Projection printing and copying cameras

Combined with or convertible to a contact printer

355 14E, G03G 1500

Patent

active

047071141

ABSTRACT:
An automatic image density adjusting method for an image forming device is disclosed which selects image density adequately in matching relation to any of various kinds of documents. There are selectively set up a first mode in which image density is sensed over a predetermined region of a document and, then, the operation directly enters into a copying cycle; and a second mode which occurs when the document density level sensed is different from a predetermined one and performs a different document density sensing operation. When density sensing which is performed on a density sensing region in the first mode is insufficient, the second mode is set up so that document density is sensed by prescanning an enlarged density sensing region so as to enter into a copying cycle after selecting a particular imaging condition. While ordinary documents are processed in the first mode to increase the copying rate, those documents which contain solid portions are processed in the second mode to provide images with adequate density which matches with the background density of such a document.

REFERENCES:
patent: 4200391 (1980-04-01), Sakamoto et al.
patent: 4372674 (1983-02-01), Yukawa et al.
patent: 4572654 (1986-02-01), Murai et al.
patent: 4618248 (1986-10-01), Buchar
patent: 4619522 (1986-10-01), Imai
patent: 4627712 (1986-12-01), Usami

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