Image forming apparatus with a developer regulating member

Details Image forming apparatus with a developer regulating member Image forming apparatus with a developer regulating member

2008-03-18

2008-03-18

Chen, Sophia S. (Department: 2852)

Electrophotography

Image formation

Development

C399S285000

Reexamination Certificate

active

11352237

ABSTRACT:
The invention realizes a uniform toner coating on a developing roller, thereby preventing a density unevenness and a toner dripping and suppressing a developing roller set mark image in a contact developing method, by conditions that the DC voltage applied to the developer regulating member is the same as the DC voltage applied to the developer carrying member or at a side of a charging polarity of the developer with respect to the DC voltage applied to the developer carrying member; and a frequency f (Hz) and a peak electric field strength E (V/m) of the AC electric field formed by the AC voltage between the developer regulating member and the developer carrying member, and a peripheral speed v (m/s) of the image bearing member satisfy conditions:in-line-formulae description="In-line Formulae" end="lead"?4.2×v≦f≦2500 andin-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?2.2×106≦E≦5.2×106.in-line-formulae description="In-line Formulae" end="tail"?

REFERENCES:
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patent: 5255057 (1993-10-01), Stelter et al.
patent: 5519472 (1996-05-01), Ojima et al.
patent: 6125246 (2000-09-01), Hashimoto
patent: 6163670 (2000-12-01), Gomi et al.
patent: 2001/0055503 (2001-12-01), Kin et al.
patent: 2002/0127033 (2002-09-01), Inoue et al.
patent: 9-127771 (1997-05-01), None

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