Mita Industrial Co., Ltd.

Takuji Terada

Nariaki Tanaka

Takashi Terada

Mitsuji Tsujita

Yuji Tanaka

Eiichi Miyamoto

Masahiko Maeda

Kazuhiro Mizude

Ichiro Yamazato

Masao Uyama

Tomohiro Tsutano

An electrophotographic method in which an electrostatic latent image on a single-layer organic photosensitive material is developed while applying a developing bias voltage of the same polarity as the polarity of the charge of the photosensitive material. The developing bias voltage is set to be higher than a potential that corresponds to a point where a curve approximating the zone of a large amount of exposure to light and a curve approximating the zone of a small amount of exposure to light in a light decay characteristics curve intersect each other.

Electrophotographic developing method using developing bias voltage

An image forming apparatus includes a rotatable photosensitive member including a conductive base and a photosensitive layer located on a surface of the base; a charging device located in the vicinity of the photosensitive member for charging the photosensitive layer; a charge removing device located upstream with respect to the charging device in a rotation direction of the photosensitive member for radiating light toward the photosensitive layer prior to charging performed by the charging device to uniformize a surface potential of the photosensitive layer; a light radiation device for radiating light to a charging area of the photosensitive layer in the state of being charged by the charging device and for adjusting the amount of the light to be radiated; an exposing device for radiating light corresponding to an image toward the photosensitive layer in the state of being charged; a developing device located downstream with respect to the exposing device in the rotation direction of the photosensitive member; a change detection device for detecting a change in at least one of a charging potential of the photosensitive layer and a sensitivity of the photosensitive layer; and a compensation device for compensating for the change by adjusting the amount of the light radiated toward the charging area by the light radiation device based on results obtained by the change detection device.

Image forming apparatus capable of changing the surface potential of a

An image forming apparatus includes a charge removing device for removing the residual charge on a photosensitive film. The light emitted from an optical source of the charge removing device is selected from the range between the wavelengths which correspond to half of the maximum absorbance in a light absorbance characteristic of the photosensitive film. Since carrier generation does not occur by the light emitted by the charge removing device, the charging ability and the charge retaining ability of the photosensitive film are improved, and the image quality is significantly improved.

Image forming apparatus

Growing community of inventors

Osaka, Japan

Takuji Terada