Electrophotography method

Abstract

Abstract PURPOSE:To obtain a uniform and satisfactory picture irrespective of an environmental variation, by setting an inital condition for forming a latent image in accordance with an ambient humidity, and also varying a condition for forming an electrostatic latent image in accordance with the number of times of repetition for formation of a latent image. CONSTITUTION:On the circumference of a photosensitive body 1, not only a primary corona discharger for forming a latent image 13, and an optical image exposure part 14 but also a secondary corona discharger 15 having the opposite polarity from that of the primary corona, and an overall surface exposure source 16 are placed. On the front of a primary corona discharge wire 31, a control grid 32 is stretched, and prescribed control voltage is applied by a controlling circuit 33. The controlling circuit 33 receives an output of a temperature and humidity detecting device 35 which has placed a sensible himidity element 34 on the circumference of the photosensitive drum, and sets grid control initial voltage of each continuous copying cycle. The potential of an electrostatic talent image in the continuous copying operation is controlled by utilizing the dependence of grid control voltage of the photosensitive body surface potential.

Inventors

• 👤 Yasuhiro Okawa
• 👤 Wahei Tokuda

Bibliographic Details