Photocopying – Contact printing – Light boxes
Patent
1992-03-20
1993-07-13
Grimley, A. T.
Photocopying
Contact printing
Light boxes
355245, G03G 2100
Patent
active
052278425
ABSTRACT:
An image forming apparatus having a developing device of the type using a two-component type developer and developing an electrostatic latent image by a bias electric field having an alternating electric field. A predetermined reference latent image is electrostatically formed on an image carrier by a reference latent image forming device and then developed by the developing device to become a reference toner image. An irregularity detecting circuit determines the degree of difference between the density of the edge and the density of the central portion of the reference toner image. A bias electric field control circuit controls the bias electric field in matching relation to the output of the irregularity detecting circuit, thereby preventing the image quality from being degraded by a change in the resistance of the carrier.
REFERENCES:
patent: 4277162 (1981-07-01), Kasahara et al.
patent: 4632537 (1986-12-01), Imai
patent: 4693592 (1987-09-01), Kurpan
patent: 4894685 (1990-01-01), Shoji
patent: 5060013 (1991-10-01), Spence
patent: 5103260 (1992-04-01), Tompkins et al.
Bannai Kazunori
Bisaiji Takashi
Hayashi Kouji
Kikuchi Norimitsu
Maruta Takayuki
Brase Sandra L.
Grimley A. T.
Ricoh & Company, Ltd.
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