| 摘要 |
PURPOSE:To reproduce a recording image with a high gradient stably even by AC bias development which uses a compounded developer by developing a reference latent image with a reference AC bias and forming a latent image or setting development bias condition on the basis of the detection signal of development characteristics. CONSTITUTION:The reference latent image is formed by electrostatic charging and exposure and the position where said reference latent image reaches a development area A is detected from the number of encoder pulses of an encoder which rotates together with a photosensitive drum 2 to develop the reference latent image with the reference oscillation bias. This latent image is detected by an optical means 14, and the detected information is compared with the contents of the memory in a CPU to select a suitable value for an applied voltage when an original latent image is developed. Further, a proper value is selected among reference oscillation bias values which vary by a fixed program and regarded as the bias value when the original latent image is developed. Further, it is compared with the contents of the memory in the CPU to make an image adjustment by varying the charging potential of the photosensitive body or the quantity of exposure. |
