| 摘要 |
PROBLEM TO BE SOLVED: To reduce the image unevenness to improve the image quality by increasing the exposing quantity per picture element of an exposing means corresponding to a color having the smallest visibility of a plurality of colors so that the sensitivity of an image carrier for this color is saturated. SOLUTION: In a digital image forming device, a current of preset value in a target current value setting part 10 which is the current value for saturating the sensitivity of the photosensitive drum of an image forming part corresponding to yellow is supplied to the LED array 103 of the image forming part corresponding to yellow by a constant current supplying part 11. In this way, a latent image is formed with the exposing quantity of yellow to all colors without increasing the size of one picture element, and the exposing quantity of yellow having low visibility is changed until the sensitivity of the photosensitive drum is saturated to make the size of one picture element the largest so as to be resistant to unevenness. Thus, the potential gradient of the electrostatic latent image is moderated by the balance between the light quantity and the photosensitive characteristic of the image carrier, so that the developing area is never largely shifted even if the potential is slightly fluctuated. |
