Image forming method and apparatus for the same

摘要

An image forming method and an apparatus therefor applicable to a color copier. A signal value representative of a reflection and appearing when the output of a photosensor is minimum in response to a change in the amount of toner deposition on a photoconductive element is detected. This maintains the density of a predetermined reference pattern used to sense an image density constant despite the change in, for example, the reflection characteristic of the photoconductive element. A bias for development is so changed as to maintain the output of the photosensor constant, so that the effective bias remains constant relative to the charge potential on the photoconductive element.