| 摘要 |
PURPOSE:To obtain sharp two-color copies by performing secondary development with an another developer having the developing threshold potential larger than the potential after finishing of primary development. CONSTITUTION:A photoreceptor 10 produced by laminating a photoconductive layer 2 and a transparent insulation layer on a conductive substrate 1 is subjected to primary charging with a Corotron 7 and at the same instant of primary exposure through a filter 5 of a complimentary color to the specific color to be reproduced, the secondary charging of the polarity reversed from that of the primary charging is applied thereupon with a Corotron 8. The photoreceptor is subjected to secondary exposure through a filter 6 that permits the transmission of only the specific color to be reproduced with the Corotron 8, and only the specific color is developed primarily with a developing machine 9. The photoreceptor 10 which is finished of the primary development is subjected to tertiary exposure with a lamp 11 for full surface exposure then to the secondary development with an another developer having the threshold potential larger than that of the potential after finishing of the primary development in a developing machine 12. |
