| 摘要 |
PROBLEM TO BE SOLVED: To provide a developing device which can form a smooth image whose granularity is inconspicuous by enabling high-speed development and suppressing ground staining by effectively applying an AC bias while preventing an abnormal image such as thinning of a lateral thin line and blurring at a sold part end. SOLUTION: A bias to the side of a photosensitive body 1 is applied to an upstream sleeve 41 among a plurality of sleeves and a reverse bias (to a sleeve side) is applied to a downstream sleeve 42. Further, a low-frequency bias is applied to the upstream sleeve 41 and a high-frequency bias is applied to the downstream sleeve 42. A bias having a large frequency amplitude is applied to the upstream sleeve 41 and a bias having a small amplitude is applied to the downstream sleeve 42.
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