Fuji Electric Co., Ltd.

Yasushi Iguchi

Sumitaka Nogami

Noriaki Kawata

Yoji Yamada

Kyoko Kitagawa

A direct heating type toner fixing roller for electrophotographic apparatuses is composed of a cylindrical tube made of a resin into which are mixed electrically conductive additives, preferably carbon fiber and carbon black powder. The resin is injection molded under defined conditions so that a reverse crown profile is formed. The roller of the invention is held in place at the toner fixing position by shafts, and the shafts themselves are supported by flanges. Electric power is supplied to the cylindrical tube to heat the tube to a predetermined thermal toner-fixing temperature through power supply terminals in contact with electrically conductive flanges. Alternately, the power supply terminals may make direct contact with peripheral parts of the cylindrical tube to heat the tube.

Roller for fixing toner and method for manufacturing same

An electrophotographic photoconductor include an conductive substrate; an undercoat layer provided on the conductive substrate; and a photosensitive layer having charge-generation and charge-transport functions provided on the undercoat layer. The undercoat layer includes a polyamide resin and methylhydrogenpolysiloxane-treated titanium dioxide and preferably styrene-maleic acid half-ester copolymer. The photoconductor can be produced by the steps of: dispersing a polyamide resin and methylhydrogenpolysiloxane-treated titanium dioxide and preferably styrene-maleic acid half-ester copolymer in a mixture solvent of an alcohol-type solvent and a halogenated hydrocarbon-type solvent, thereby preparing a coating liquid for an undercoat layer; applying the coating liquid onto a conductive substrate, thereby providing an undercoat layer on the substrate; and forming a photosensitive layer on the undercoat layer.

Electrophotographic photoconductor and process for producing the same

An organic photosensitive member for electrophotography is provided which comprises a photosensitive layer 3 formed on an electroconductive substrate 1 via an undercoating layer 2, the photosensitive layer 3 comprising a charge generating layer 4 and a charge transporting layer 5, wherein the undercoating layer 2 consists essentially of 12/6/66 copolymeric polyamide expressed by the general formula (I) ##STR1## and a styrene/maleic acid half ester copolymer. By providing such an undercoating layer, it becomes possible to obtain a photosensitive member having excellent electrophotographic characteristics, involving minimal changes in these characteristics during repeated use, and giving a high quality image stably.

Growing community of inventors

Kawasaki, Japan

Yasushi Iguchi