| 摘要 |
A developing device having a plurality of sleeves is provided to be able to perform a high-speed development. The developing device is provided to be able to prevent the abnormal image, for example, blur at the rear end of a solid image or a thinning of the 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 on an upstream-side sleeve, and a bias in the reverse direction (towards the sleeve side) is applied to the downstream-side sleeve. Alternatively, a bias with a low frequency is applied to the upstream-side sleeve and a bias with a high frequency is applied to the downstream-side sleeve. In addition, a bias with a large frequency amplitude is applied to the upstream-side sleeve, and a bias with a small frequency amplitude is applied to the down stream-side sleeve.
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