| 摘要 |
A developing apparatus in which a toner carrying surface is provided spaced opposite an electrostatic latent image surface to form a very small gap therebetween, and A.C. bias voltage is applied to the gap to jump toner to an electrostatic latent image portion, wherein the A.C. voltage applied to the gap has a frequency which varies with time, and the toner is jumped to the electrostatic latent image portion under influence of an alternating electric field established by the A.C. voltage, increasing the toner particle jumping possibility and improving the gradation and denseness properties of the resulting developed image. |
