Electrophotography – Machine operation – Having power supply
Patent
1998-11-25
1999-09-14
Pendegrass, Joan
Electrophotography
Machine operation
Having power supply
399281, 399284, G03G 1508
Patent
active
059535571
ABSTRACT:
An image forming apparatus can effectively restrict a phenomenon to lower a charge amount of toner on a developing roller according to increasing of number of printing to stabilize supply of toner for a latent image carrier body and whereby to maintain good printing condition for a long period. The image forming apparatus includes a latent image carrier body, a developing roller supplying a toner to a latent image formed on the latent image carrier body, a toner supply roller supply the toner contacting the developing roller, a thin film forming member restricting a toner amount and a toner charge amount on the developing roller contacting with the developing roller, and power source means for supplying a bias to the toner supply roller and the thin film forming member in such a manner that a relationship between a voltage Vsr and a current Isr satisfies .vertline.Vsr.vertline./a+.vertline.Isr.vertline./b=1 (where a and b are constants of power source characteristics).
REFERENCES:
patent: 4314755 (1982-02-01), Kinashi
patent: 5473417 (1995-12-01), Hirano
patent: 5519471 (1996-05-01), Nishimura et al.
patent: 5628043 (1997-05-01), Ikeda et al.
patent: 5761590 (1998-06-01), Sato
NEC Corporation
Pendegrass Joan
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