| 摘要 |
PURPOSE:To improve the gamma of a photoconductive sheet by performing the image exposure at the making of a printing master repeatedly twice in the state of absence of other incident light. CONSTITUTION:After a photoconductive sheet 10 is mounted on a rotary drum 1, electric charging 4 and image exposure 13 at about 31 Lux.Sec quantity of light were repeated twice and immediately two component toner development was carried out, whereby visible images were obtained. While the above-mentioned two times of charging and image exposure are accomplished, arrangement is so made that the light irradiation by other light sources or the light leakage of the image exposure light source or the like does not occur. Thence, the images are heat-fixed with a fixing device 9. |
