| 摘要 |
PURPOSE:To prevent an image from causing uneveness and fogging pattern by providing a means for controlling a power source voltage so that an electric field between a developer carrying means and the surface of a latent image carrier can be kept constant. CONSTITUTION:It is difficult to keep a distance between the developer carrying member (sleeve) 9 and the photoconductor layer 2 of the latent image carrier (conductive drum) 1 constant. The unevenness, etc., in the image is caused since the amount of developer T which moves to the surface of the photoconductor layer 2 from the sleeve 9 changes by the variation of said distance. Then, a light source 16 is made to project between the surface of the photoconductor layer 2 on a non-recording position and the sleeve 9, and light which passes through the gap is received by a photodetector 1. An output voltage from the photodetector 17 is made to pass through an amplifier 18 and the output voltage from an AC power source 15 is changed so that the AC electric field between the photoconductor layer 2 and the sleeve 9 is kept constant. Thus, the uniform image can be always obtained even if the gap between the photoconductor layer 2 and the sleeve 9 varies. |
