| 摘要 |
PURPOSE:To prevent deterioration of 2-color image quality, by combining toners and carriers so as to render one toner straying into the other toner same in polarity as the other toner in successively developing an electrostatic latent image charged to both polarities with toners different in polarity and color. CONSTITUTION:In the process in which an electrostatic latent image charged to both polarities is formed on the same photoreceptor, developed with toners different in polarity and color, and transferred to plain paper to obtain a 2-color image, one toner is scraped down and mixed into the other developer in the next development. At that time, each carrier is selected so as to render the stray toner same in polarity as the latter main toner to allow a small amount of the stray toner to attach to the same latent image together with the latter toner and to prevent much obstruction due to this wrong toner attachment, thus permitting prevention of accumulation of toners different from each other in polarity and color, consequent disturbance of charging state, and deterioration of image quality to a great extent. |
