| 摘要 |
PURPOSE: To provide a developing device constituted so as to obtain a uniform excellent halftone gradation image by further regulating the layer thickness of a toner layer transferred from a layer forming roller onto a developing roller by a bias, to be constant by a second layer thickness regulating member. CONSTITUTION: The developing device is provided with the developing roller 12 consisting of an elastic body, the layer forming roller 13 provided to face the developing roller 12, for forming a developer layer, a first layer regulating blade 20 regulating the layer thickness of the developer layer on the layer forming roller 13 and simultaneously, electrifying the developer layer to a prescribed polarity, voltage impressing means 16 and 17 for impressing a potential difference for transferring the developer layer formed by the first layer regulating blade 20 onto the developing roller 12, between it and the layer forming roller 13 and a second layer regulating blade 21 regulating the layer thickness of the developer layer transferred onto the developing roller 12. |
