Ricoh Company, Ltd.

Satoshi Igari

Yasuo Suzuki

Yasushi Nakazato

Katsuaki Miyawaki

Nekka Matsuura

Makoto Obu

Takeo Suda

Katsuichi Ohta

Yasuyuki Shinkai

Michio Kimura

Yuichiro Kanoshima

Takeshi Saitou

Tetsuroh Miura

Kohji Ichimiya

Izumi Aiso

Mamoru Kiyota

Kazuya Ishida

An electrophotographic image forming apparatus of the present invention includes a frame, a photoconductive drum disposed in the frame, and an air conditioning device for removing moisture around the drum inside the frame. The drum has a wear-resistant, durable surface layer that wears by an amount of 0.05 &#x3bc;m to 0.5 &#x3bc;m for 100,000 rotations.

Air-conditioned electrophotographic image forming apparatus

An integration density acquiring unit for a consumption information management apparatus acquires integration density from an image signal sent from an image processing section, and an information converting unit calculates a quantity of consumed toner (consumption information) by multiplying the integration density by a specified coefficient to send the quantity to a cumulative consumption information calculating unit. The cumulative consumption information calculating unit temporarily stores the information for the quantity of toner consumption in a memory, and reads out the information from the memory at predetermined timing. Accordingly, it is possible to determine only the cost for developer used by a user or calculate the quantity of developer remaining within an image formation apparatus based on the cumulative consumption information for the unadjusted developer stored in the memory.

Consumption information management apparatus, image formation apparatus, and consumption information management system

An electrophotographic photoconductor composed of an electroconductive support and a photoconductive layer formed thereon, which contains a charge generating material, a binder resin including a butyral resin containing a polyvinyl butyral resin component at a molar ratio of 68 mol % or more, a charge transporting material, and biphenyl or a biphenyl derivative.

Electrophotographic photoconductor

An electrophotographic copying apparatus is provided with a belt-shaped photoconductor comprising. A magnetic electroconductive support and a photoconductive layer are formed on the photoconduction. A magnetic cleaning member is positioned for cleaning the surface of the belt-shaped photoconductor.

Electrophotographic copying apparatus having photoconductor with

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Kanagawa, Japan

Satoshi Igari