Developing device having plurality of biased magnetic sleeves

Details Developing device having plurality of biased magnetic sleeves Developing device having plurality of biased magnetic sleeves

2005-09-06

2005-09-06

Grimley, Arthur T. (Department: 2852)

Electrophotography

Image formation

Development

C399S055000, C399S270000

Reexamination Certificate

active

06941099

ABSTRACT:
A developing device having a plurality of sleeves is provided for high-speed development and the prevention of an abnormal image, for example, thinning of a line image. An AC bias is effectively applied, so that the base contamination is suppressed to obtain a smooth image without obvious grains. Among the plural sleeves, a bias towards the photoreceptor side is applied to an upstream-side sleeve, and a bias in the reverse direction is applied to a downstream-side sleeve. Alternatively, an AC bias with a low frequency is applied to the upstream-side sleeve and an AC bias with a high frequency is applied to the downstream-side sleeve. In addition, an AC bias with a large amplitude is applied to the upstream-side sleeve, and an AC bias with a small amplitude is applied to the downstream-side sleeve.

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Translation of Kusumoto JP2000-214686.

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