| 摘要 |
PURPOSE:To improve the fixability of a toner and the quality of a developed image by coating thinly a developer having an insulating toner and conductive magnetic powder on a member for supporting the developer, conveying the developer to a developing region and impressing an alternating electric field in the space between a member for holding a latent image and the member for supporting the developer. CONSTITUTION:A developing part is disposed with two magnetic poles S1, N2 off the developing region in a developing sleeve 5 facing a body 4 for holding an electrostatic latent image and therefore the magnetic brush to be formed by carrier particles is not formed in the developing region. The thickness of the developer layer formed on the sleeve 5 is thinly regulated by the magnetic filed between a blade 7 consisting of a magnetic material and the sleeve 5 and the developer is conveyed to the developing region between the magnetic poles S1 and N2. An alternating electric field is impressed between the sleeve 5 and a photosensitive drum 4 in said developing region by an electric power source 11, by which the carrier and toner in the developer are separated under forward and backward movement and only the toner remains on the drum 4. The visible image is thus formed on the drum. |
