公开(公告)号：US4961094A

公开(公告)日：1990-10-02

申请号：US200660

申请日：1988-05-31

申请人： Toshihiko Yamaoki ,  Kenichiro Wakisaka ,  Kouji Minami ,  Masayuki Iwamoto

发明人： Toshihiko Yamaoki ,  Kenichiro Wakisaka ,  Kouji Minami ,  Masayuki Iwamoto

IPC分类号： G03G13/01

CPC分类号： G03G13/01 ,  G03G2215/0497

摘要： An electrostatic recording apparatus includes a photosensitive drum which is charged at +700 V by a first charger. Intensity of the light emitted from an LED array that is downstream from the first charger is adjusted such that a light image having strong intensity and/or a light image having weak intensity can be irradiated to the photosensitive drum. A surface voltage of a portion where the light image having weak intensity is irradiated becomes +400 V. A surface voltage of a portion where the light image having strong intensity is irradiated becomes +100 V. The photosensitive drum is charged at -400 V in the reverse polarity opposite to that of the first charger by a second charger which is arranged downstream from the LED array. As a result, electrostatic latent images of three gradations having voltages of +300 V, 0 V and -300 V respectively are formed on the photosensitive drum. The electrostatic latent images of +300 V and -300 V are respectively developed by developers with a black toner being charged in the negative polarity (-) a red toner being charged in the positive polarity (+).

摘要翻译： 静电记录装置包括通过第一充电器以+ 700V充电的感光鼓。 调整从第一充电器下游的LED阵列发出的光的强度，使得具有强烈强度的光图像和/或具有弱强度的光图像可以照射到感光鼓。 照射弱强度的光像的部位的表面电压变为+400V。照射强度强的光像的部分的表面电压为+100V。感光鼓以-400V的电压充电 反向极性与第一充电器的极性相反，第二充电器设置在LED阵列的下游。 结果，在感光鼓上分别形成具有+ 300V，0V和-300V电压的三个等级的静电潜像。 + 300V和-300V的静电潜像分别由显影剂开发，黑色调色剂以负极性（ - ）充电，红色调色剂以正极性（+）充电。