Fujitsu Corporation

Kazumi Kawabata

Tomoaki Tanaka

Eiji Suzuki

Kazunori Hirose

Tsuneo Mizuno

Katsumi Sugimoto

Kenji Fuke

Hideki Kamaji

Katsuya Shimatsu

Sadaaki Yoshida

Yasuhiro Wakabayashi

Teturou Nakashima

Hitoshi Yoshii

Takeshi Tanimoto

Yoshimi Takizawa

An electrostatic recording system using a dielectric belt for conducting electrification of a sheet of paper and a transfer belt so that the sheet of paper is not wound and caught by a photoconductor drum, and a transfer voltage can be lowered so as to smoothly separate the sheet of paper from a transfer belt. The electrostatic recording system applies a voltage to only the dielectric belt at a stage before the sheet of paper 3 is attracted to the dielectric belt 10 and applies voltage to the sheet of paper 3 conveyed to the dielectric belt, and to the dielectric belt 10 while the sheet of paper and the belt are mutually superposed.

Electrostatic recording system using dielectric belt in which

An electrophotographic apparatus with an endless photosensitive member such as a photosensitive drum. The electrophotographic apparatus includes a dew condensation preventing device for preventing dew condensation on the photosensitive member, a temperature sensor for detecting a temperature in the vicinity of an outer surface of the photosensitive member, and a humidity sensor for detecting a humidity in the vicinity of the outer surface of the photosensitive member. The electrophotographic apparatus further includes a calculating unit for calculating a water vapor density having a given functional relationship with temperature and humidity, according to the temperature detected by the temperature sensor and the humidity detected by the humidity sensor, a storing unit for storing a preset control value, and a control unit for controlling the dew condensation preventing device according to the water vapor density calculated by the calculating unit.

Electrophotographic apparatus with dew condensation preventing means

An electrostatic latent image formed on a photosensitive drum is electrostatically developed with a non-magnetic type developer, and is electrostatically transferred from the drum to a paper. The developer is composed of a toner component and a resin powder component, one component of which has a polarity opposite to that of an electric charge of the other component generated by triboelectrification therebetween. In the developing process, a conductive foam rubber developing roller is used, which includes a conductive tubular foam rubber roller element, and a metal shaft inserted into a central bore thereof. The roller element has an outer thicker portion including a conductive filler dispersed therein, and an inner solid skin layer defining the central bore thereof and exhibiting an electrical resistivity considerably higher than that of the thicker portion for lack of conductive filler. Nevertheless, a sufficient electrical contact is established between the roller element and the shaft. A thin metal blade is pressed against the roller for regulating the thickness of the developer entrained thereby, and is arranged to compensate for a resilient deformation of the shaft caused when pressing the blade against the roller.

Image formation apparatus, developing device incorporated therein and

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Kawasaki, Japan

Kazumi Kawabata