Bridgestone Corporation

Hiroshi Harashima

Takahiro Kawagoe

Yoshio Takizawa

Hiroshi Kaneda

Yoshitomo Masuda

Koji Takagi

Gaku Yakushiji

Hideharu Daifuku

Hideyuki Niwa

Kinya Suzuki

Taro Miyamoto

An object, typically photoconductor drum is electrically charged by placing a contact charger member in abutment with the object to be charged and applying voltage between the contact charger member and the object. Charging is effected by properly controlling the capacitance of the contact charger member, the capacitance of the object, and the applied voltage. A sufficient charged potential is achieved through the application of a relatively low voltage, while preventing ozone generation.

Contact charging method and apparatus

A developing roller includes a metal shaft and a conductive resilient sleeve surrounding the shaft and made of a urethane elastomer containing carbon black with at least pH 5. The developing roller is mounted in an electrophotographic apparatus in combination with a latent image-bearing photoreceptor wherein development is carried out using a non-magnetic single-component toner.

Developing roller and apparatus

Growing community of inventors

Kodaira, Japan

Hiroshi Harashima