Patent ID: 8158313

Claim:
An image forming method for forming color images on an image bearing member utilizing a plurality of toner, comprising the steps of: charging uniformly the image bearing member once, the image bearing member including only one photosensitive layer; writing a latent image having a plurality of levels of electric potential on the image bearing member with a single exposure; adhering a first toner on a first portion of the image bearing member having a lowest electric potential; decreasing an electric potential of a portion of the image bearing member not developed with the first toner by uniformly exposing the image bearing member with light at a first wavelength whose transmission factor is lowest for the first toner; adhering a second toner on a second portion of the image bearing member having a second lowest electric potential; decreasing an electric potential of a portion of the image bearing member not developed with the first or second toners by uniformly exposing the image bearing member with light at a second wavelength whose transmission factor is lowest for each of the first toner and the second toner; adhering a third toner on a third portion of the image bearing member having a third lowest electric potential; decreasing an electric potential of a portion of the image bearing member not developed with the first, second, or third toners by uniformly exposing the image bearing member with light at a third wavelength whose transmission factor is lowest for each of the first toner, the second toner, and the third toner; adhering a fourth toner on a fourth portion of the image bearing member having a fourth lowest electric potential.