Photocopying – Contact printing – Light boxes
Patent
1994-06-17
1996-03-26
Smith, Matthew S.
Photocopying
Contact printing
Light boxes
355245, 355261, 118647, 118651, G03G 1506
Patent
active
055025528
ABSTRACT:
In a developing device for an image forming apparatus, a developing roller has dielectric portions and conductive portions distributed regularly or irregularly over the surface thereof. The surfaces of the dielectric portions are smaller in height than the surfaces of the conductive portions. The difference in height is greater than one-half of the volumetric mean particle size of a toner. A charge opposite in polarity to a charge to be deposited on the toner is deposited on the dielectric portions. The dielectric portions, or recesses, each has a width more than three times as great as the volumetric mean particle size of the toner and a depth less than five times the volumetric particle size. The dielectric portions may be greater in height than the conductive portions and may be implemented as spiral grooves inclined more than 30 degrees relative to the axis of rotation of the developing roller. The developing roller may be moved at a higher linear velocity than a photoconductive drum.
REFERENCES:
patent: 3203394 (1965-08-01), Hope et al.
patent: 3696783 (1972-10-01), Fantuzzo
patent: 4011834 (1977-03-01), Stephan
patent: 4100884 (1978-07-01), Mochizuki et al.
patent: 4331754 (1982-05-01), Stephan
patent: 4564285 (1986-01-01), Yasuda et al.
patent: 5365318 (1994-11-01), Hiraoka et al.
Iwata Naoki
Komuro Ichiro
Nishido Kazuhiro
Saito Takeshi
Sawa Shigeki
Ricoh & Company, Ltd.
Smith Matthew S.
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