Electrophotography – Image formation – Development
Patent
1997-05-23
1999-08-31
Moses, Richard
Electrophotography
Image formation
Development
492 30, 492 53, G03G 1508
Patent
active
059465360
ABSTRACT:
A developing roller 19 is formed of a blend material produced of silicone rubber and EPDM, which has good abrasion proof, and subjected to a rubbing process to rub a surface of the developing roller 19 until convex portions 19A formed on the surface become less than two times a particle diameter (5-10 .mu.m) of toner T, i.e., 10-20 .mu.m. Accordingly, the surface condition of the developing roller is not changed for a long time and thus the toner T can uniformly be carried on the surface of the developing roller 19, forming a uniform thickness toner layer, thereby enabling to uniformly charge the toner layer. Uniformly charged toner layer on the surface of the developing roller 19 thus makes it possible to develop an electrostatic latent image formed on a photosensitive drum 12 with uniform toner density, causing no difference in toner density. When the developed image on the photosensitive drum 12 is transferred to a sheet 50, a resultant image with uniform image density can be formed on the sheet 50.
REFERENCES:
patent: 5110705 (1992-05-01), Hosoya et al.
patent: 5565968 (1996-10-01), Sawa et al.
Brother Kogyo Kabushiki Kaisha
Moses Richard
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