Photocopying – Contact printing – Light boxes
Patent
1993-02-24
1994-07-26
Grimley, A. T.
Photocopying
Contact printing
Light boxes
355208, 355219, 355246, 355274, G03G 2100
Patent
active
053330374
ABSTRACT:
An image-quality stabilizer for an electrophotographic apparatus forms a toner patch on a photoreceptor drum, detects the amount of toner attracted to the photoreceptor drum by an optical sensor, and controls each processing device so that the detected value is equal to a reference value which has been detected and stored when the number of image forming operations performed is low. After the control, the toner patch is transferred to a transfer sheet, and the amount of toner remaining on the photoreceptor drum is detected. The reference value is adjusted based on the detected value so as to compensate for a lowering of transfer efficiency. Or the lowering of transfer efficiency is compensated by controlling variables such as transfer output so that the detected value is equal to a reference residual value which has been detected and stored when the number of image forming operations performed is low. This arrangement restrains a lowering of image density due to a change in the transfer efficiency. It is therefore possible to control stabilizing the image quality accurately and to form images of stable quality.
REFERENCES:
patent: 5175585 (1992-12-01), Matsubayashi et al.
patent: 5241347 (1993-08-01), Kodama
Inoue Katsushi
Kawabata Itaru
Masuda Jitsuo
Noguchi Teruhiko
Conlin David G.
Fournier Kevin J.
Grimley A. T.
O'Connell Robert F.
Royer William J.
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