| 摘要 |
PROBLEM TO BE SOLVED: To provide an excellent image on which an omission of white from the image is not caused while attaining an excellent gradational characteristic having a wide dynamic range by using a photoreceptor to show a light electric potential attenuating characteristic by which electric potential is hardly attenuated to weak light input and the electric potential is largely attenuated when exceeding light input not less than a certain specific value in an image forming device by adopting a magnetic brush contact developing system. SOLUTION: A photoreceptor 1 is formed as a photoreceptor having a characteristic by which reduction in an absolute value of electric potential on a surface of the photoreceptor 1 to an increase in energy of a light beam 25 to irradiate the electrified photoreceptor 1 draws a curve having an inflection point by prescribed light energy. A developer carrier 91 to stick toner on the photoreceptor 1 in a pattern according to an electrostatic latent image formed on the photoreceptor 1 by contacting a developer with the photoreceptor 1 by carrying the developer by mixing magnetic particles and toner on a surface while moving at moving speed faster than moving speed of the photoreceptor 1 in a prescribed developing position, is arranged in a developing means 3. |
