Electrophotography – Image formation – Development
Patent
1996-04-26
1998-10-20
Grimley, Arthur T.
Electrophotography
Image formation
Development
399 99, 399235, G03G 1506, G03G 1508
Patent
active
058261443
ABSTRACT:
In an electrophotographic recording apparatus of the type using a single-ingredient type developer, i.e., toner, a developing device has a developing roller for conveying the toner deposited thereon, and an intermediate roller for conveying the toner transferred theretofrom the developing roller and depositing it on a latent image electrostatically formed on an image carrier to thereby produce a corresponding toner image. During the development of an area of the image carrier other than a latent image area, a bias assigned to the developing roller is switched over to thereby form an electric field different in direction from an electric field assigned to the formation of the toner image between the two rollers. Further, before the rotation of the image carrier is stopped, the bias assigned to the developing roller is again switched in order to form the electric field for the formation of the toner image between the rollers. As a result, a toner layer is formed on the intermediate roller. Subsequently, the rotation of the image carrier is stopped. The device obviates defective images ascribable to the adhesion of the image carrier and intermediate roller while eliminating background contamination and wasteful toner consumption.
REFERENCES:
patent: 5079115 (1992-01-01), Takashima et al.
patent: 5486909 (1996-01-01), Takenaka et al.
patent: 5489747 (1996-02-01), Takenaka et al.
Patents Abstracts of Japan, P. 1015, 1990, vol. 14, No. 114.
Patents Abstracts of Japan, P-1222, 1991, vol. 15, No. 262.
Endoh Shuichi
Hosokawa Hiroshi
Komatsubara Satoru
Matsumae Iwao
Murakami Eisaku
Grainger Quana
Grimley Arthur T.
Ricoh & Company, Ltd.
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