Sharp Kabushiki Kaisha Corporation

Hideaki Taniguchi

Yasutaka Maeda

Masayuki Sakamoto

Makoto Kurokawa

Masaya Tsugoshi

Ken-ichi Iwamoto

Koichi Moriyama

Yoshiaki Imanaka

Osamu Kawasaki

A photosensitive body for electrophotographical use has a conductive base body and a marking area provided thereon. The maximum surface roughness of a photosensitive layer provided right on the marking area is specified not to exceed 2.5 &mgr;m. And also, a ratio of the optical reflective index of the marking area to the optical reflective index of the non-marking area is specified to be in a range of 0.3 to 0.7. In this manner, even when the photosensitive layer is thin (not exceeding 25 &mgr;m), it is possible to prevent problems such as inadequate cleaning and toner falling. Hence, it is possible to offer a photosensitive body for electrophotographical use which can constantly produce high quality copied images.

Photosensitive body for electrophotographical use and manufacturing method thereof

A photosensitive body for electrophotographical use has a conductive base body and a marking area provided thereon. The maximum surface roughness of a photosensitive layer provided right on the marking area is specified not to exceed 2.5 .mu.m. And also, a ratio of the optical reflective index of the marking area to the optical reflective index of the non-marking area is specified to be in a range of 0.3 to 0.7. In this manner, even when the photosensitive layer is thin (not exceeding 25 .mu.m), it is possible to prevent problems such as inadequate cleaning and toner falling. Hence, it is possible to offer a photosensitive body for electrophotographical use which can constantly produce high quality copied images.

Photosensitive body for electrophotographical use and manufacturing

A developing agent for electrophotographic copier contains SiO.sub.2 and/or magnetite in addition to a toner such that talc can be effectively removed from the photoreceptor surface.

Developing agent for electrophotography with silica and magnetite

A surface of a heated fixing roller is coated with a tetrafluoroethylene resin in which pin holes are present in the range of about 5-30 unit/cm.sup.2 and the diameter of the pin holes is in the range of about 5-20 .mu.m.

Growing community of inventors

Yoshino-gun, Japan

Hideaki Taniguchi