| 摘要 |
PURPOSE:To establish a development method rich in dotted image reproduction performance by specifying the gap between a toner carrying body layer specified in resistivity and an electrostatic latent image bearing body and an alternating electric field to be applied to them. CONSTITUTION:The toner carrying body layer made of a semiconductive dielectric body having a resistivity of 10<6>-10<12>OMEGA.cm is formed opposite to an electrostatic latent image bearing body, on a developing electrode. The developing gap between both bodies is regulated to <=0.5mm., and a high frequency alternating electric field satisfying the following relationships: 400V<=Vp-p<=4,500V, and 5<= Vp-p/t<=50, is applied, where the development gap is regulated to <=t(mum), and Vp-p is the amplitude of this electric field to be applied. When the voltage Vp-p between peaks of an AC bias voltage is within 400V-4,500V, the toner can be jumped sufficiently. When the applied amplitude Vp-p of the alternating electric field divided by (t) is within 5-50, good development results can be obtained. |
