| 摘要 |
PURPOSE:To form electrostatic charge images of a wide range in potential changes and improve the reproducibility of gradation characteristic by creating two kinds of secondary electrostatic charge images by the use of a screen formed with a primary electrostatic charge image and superposing these. CONSTITUTION:A photoconductive layer 3 is formed on one surface of a conductive base 2 having multiple fine through-openings, such as metal net, and an insulation layer 4 is formed on the other surface, and further a biasing conductive layer 5 is provided on this insulation layer 4 to form a screen-form photoreceptor. First, the photoconductive layer 3 on the screen 1 is evenly charged, then light is radiated from a light source through the transparent original, whereby the primary electrostatic charge image corresponding to the original is formed. Next, a commercially marketed recording medium 8 which has been held on a metal electrode plate 9 is opposedly disposed to the photoconductive layer 3 and with the 1st bias voltage being held applied to the conductive layer 5, a plus voltage is applied from a power source 12 to the electrode plate 9. A minus voltage is then applied by a power source 13 and a charger 10 is scanned to form the secondary electrostatic charge image by the dots corresponding to the openings of the screen 1 on the recording medium 8. |
