image forming device

Abstract

Abstract PURPOSE:To keep the quantity of corona discharge constant at the transfer time to stabilize it against the variance of the external environment, by providing a constant current circuit between a shield plate of a corona charger, which is provided for transferring an image to a transfer member, and the earth. CONSTITUTION:Since a constant currentIa is always supplied to a wire 8a of a corona chaeger 8 from a constant current power source 7a, the influence of the variance of the external environment is suppressed. The sum of a corona discharge currentIb flowed from the wire 8a to a shield plate 8b and a corona discharge currentIc flowed from the wire 8a to a destaticizing needle 9 is always kept constant by a constant current circuit 7b. Consequently, the magnitude and the direction of the corona discharge current flowed to a transfer member 6 and a drum photoreceptor are kept constant, and a wide-latitude transfer is possible for the unevenness of the image, scattering of the image, the paper impression, etc. which are generated at the transfer period.

Inventors

• 👤 Masahiro Goto
• 👤 正弘 後藤
• 👤 Takeshi Watanabe
• 👤 毅 渡辺

Bibliographic Details