Photocopying – Contact printing – Light boxes
Patent
1992-12-09
1995-02-07
Grimley, A. T.
Photocopying
Contact printing
Light boxes
355208, G03G 2100
Patent
active
053879651
ABSTRACT:
A toner density control method senses the concentration of a toner image for control formed on a photoconductive element by an optical sensor and, based on the output of the sensor, corrects a target target toner concentration for toner supplement control to be effected in response to an output of a toner concentration sensor mounted on a developing device. When the output Vs of the optical sensor is determined to be greater than a reference value Vs.sub.0 (short toner deposition), the reference value Vt.sub.0 is corrected to smaller one. When Vs determined to be smaller than Vs.sub.0 (excessive toner deposition), Vt.sub.0 is corrected to greater one. In each of such cases, a predetermined amount n.multidot..DELTA.VT is subtracted from or added to the output Vt of the toner concentration sensor of that instant.
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Hasegawa Shin
Kato Shinji
Koichi Yasushi
Grimley A. T.
Ramirez Nestor R.
Ricoh & Company, Ltd.
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