ADJUSTING METHOD OF TONER DENSITY

摘要

PURPOSE:To reproduce a recording image with a high gradient stably by AC bias development which uses a compounded developer by developing a reference latent image on an image carrier with a reference AC bias and detecting toner density from its 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 a reference oscillation bias. The developed reference latent image is detected by an optical means 14, whose detection information is compared with the contents of the memory in a CPU to detect or decide on toner density. Further, the relation between the recording image density and toner density in the presence of the oscillation bias is obtained by experiment.