Electrophotography – Image formation – Development
Reexamination Certificate
2008-03-19
2010-11-02
Gray, David M (Department: 2852)
Electrophotography
Image formation
Development
C399S279000, C399S267000
Reexamination Certificate
active
07826781
ABSTRACT:
An image forming apparatus has a photoconductive member, and a developing roller develops a latent image on the photoconductive member by a first alternating-current bias in the form of a rectangular wave. The following relationships are satisfied in calculating the duty ratio (D1) of the first alternating-current bias using an application period of voltage in a direction to transfer the toner from the developing roller towards the photoconductive member as a positive period:a CV value in the number particle size distribution of the toner is ≦25%,4 μm≦Dt≦7 μm,105Ω·cm≦pv≦109Ω·cm,0.4 μm≦Ra≦1.5 μm, and35%≦D1≦75%.where Dt denotes the volume average particle diameter of the toner, pv denotes the intrinsic resistance value of a developing roller surface, Ra denotes the arithmetic average roughness of the developing roller surface.
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Fujishima Masashi
Inoue Toyotsune
Mori Yukihiro
Nakaue Takahisa
Sakata Shoichi
Gray David M
Hespos Gerald E.
Kyocera Mita Corporation
Porco Michael J.
Yi Roy
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