Electrophotography – Supplemental electrophotographic process – Exposure or charging
Patent
1999-06-02
2000-05-30
Chen, Sophia S.
Electrophotography
Supplemental electrophotographic process
Exposure or charging
399 51, 430902, G03G 1504, G03G 2100
Patent
active
060700327
ABSTRACT:
In an electrostatic printing apparatus, the residual image phenomenon conspicuously observed at low density printing can be eliminated while photo-deterioration of the photosensitive body is being suppressed to a minimum in a high speed printing process. A charging unit, a writing light source, a developing unit, a transfer unit, a first erase lamp, an AC discharging unit and a second erase lamp are arranged around a photosensitive drum. Therein, the light intensity of the erase lamp is strengthened when the density of a printed image is light and is weakened when the density of the printed image is dark. That is, by changing the light intensity of the erase lamps corresponding to a developing bias, the residual image phenomenon can be eliminated while suppressing deterioration of the photosensitive drum to a minimum.
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Otome Yukio
Rokutanda Takashi
Umeda Takao
Chen Sophia S.
Hitachi Koki Co,. Ltd.
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