Image forming apparatus having density control

Details Image forming apparatus having density control Image forming apparatus having density control

1991-05-01

1993-02-23

Grimley, A. T.

Recorders

Printing, dotting, or punching marker

Ink transfer support or moving means

346 11, 346160, 358298, 358300, G01D 1514

Patent

active

051894416

ABSTRACT:
In an electrophotographic image forming apparatus wherein raster scan of a laser beam is carried out to expose the sensitized photoconductor and the gradation is expressed with intensity modulation method, the duration of the light-emitting time for forming a dot is made smaller than the whole period needed for scanning a region assigned for a dot, while the maximum light intensity is changed according to a ratio of the duration of the light-emitting time to the whole period. Further, a plurality of modes each having a duty ratio different from each other may be provided and the maximum light intensity is changed according to the duty ratio so that the mean quantity of light for a dot is equal to each other.

REFERENCES:
patent: 3631509 (1971-12-01), Marshall
patent: 4390882 (1983-06-01), Ohara et al.
patent: 4449153 (1984-05-01), Tschang
patent: 4679057 (1987-07-01), Hamada
patent: 4912568 (1990-03-01), Shimano
patent: 4914459 (1990-04-01), Mama et al.
patent: 5017944 (1991-05-01), Kitamura et al.
patent: 5055855 (1991-10-01), Nishio

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