Kyocera Mita Corporation

Mita Industrial Co., Ltd.

Mitsuo Ihara

Ichiro Yamazato

Akiyoshi Urano

Yukimasa Watanabe

Hirofumi Kawaguchi

Yuji Tanaka

Eiichi Miyamoto

Fumio Sugai

Yasufumi Mizuta

Sakae Saito

Toshiyuki Fukami

Hideo Nakamori

Daisuke Kuboshima

Yukikatsu Imanaka

Masato Katsukawa

Atsushi Fujii

Yuka Nakamura

Ayako Sugase

Jun Azuma

Koji Kuramashi

Kazunari Hamasaki

Hiroaki Iwasaki

Susumu Hiroshima

Yukihiro Ito

Maki Uchida

Hiromi Nakatsu

Teruyo Taguchi

The present invention relates to a titanyl phthalocyanine crystal having excellent storage stability of coating solution, to satisfy that (a) the crystal does not have a peak of a change in temperature except for a peak associated with evaporation of adsorbed water in differential scanning calorimetry or that (b) the crystal recovered after dipping in an organic solvent for 24 hours at least a maximum peak at a Bragg angle 2&thgr;&plusmn;0.2&deg;&equals;27.2&deg; and has no peak at 26.2&deg; in a CuK &agr; characteristic X-ray diffraction spectrum, and a method of producing the same; and an electrophotosensitive material using the above crystal, and a method of producing the same.

Titanyl phthalocyanine crystal and production method of the same, and electrophotosensitive material and production method of the same

In a copying machine which is an image forming apparatus according to the present invention, an air fan and an air duct on the downstream side thereof are provided in a housing , to lead an air current to an opening of an image forming unit through the air duct The opening is for passing a light beam from a light irradiating unit and is also used for blowing off air, to lead the air current to the photosensitive drum A rib is provided in the vicinity of the opening in the housing to efficiently guide the air current to the opening without varying the air current. The air current disperses ozone or the like in an area surrounding the photosensitive drum

Image forming apparatus with a housing diffusing ozone

Electrophotosensitive material and method of producing the same

The present invention provides an electrophotosensitive material comprising a conductive substrate and a photosensitive layer provided on the conductive substrate, the photosensitive layer comprising a specific hole transferring material and/or electron transferring material and a binding resin of a polyester resin which is a substantially linear polymer obtained by using a specific dihydroxy compound represented by the general formula (1):

Electrophotosensitive material

The present invention provides a naphthoquinone derivative represented by the general formula (I): ##STR1## wherein R.sup.1 and R.sup.2 are as defined in the specification. An electrophotosensitive material containing this naphthoquinone derivative as an electron transferring material has high sensitivity.

Naphthoquinone derivative and electrophotosensitive material using same

Naphthoquinone derivative

The present invention provides an electrophotosensitive material comprising a conductive substrate and a photosensitive layer provided on the conductive substrate, the photosensitive layer comprising a specific hole transferring material and/or electron transferring material and a binding resin of a polyester resin which is a substantially linear polymer obtained by using a specific dihydroxy compound represented by the general formula (1): ##STR1## wherein R.sup.1 is an alkylene group having 2 to 4 carbon atoms; and R.sup.2, R.sup.3, R.sup.4 and R.sup.5 are the same or different and indicate a hydrogen atom, an alkyl group having 1 to 4 carbon atoms, an aryl group or an aralkyl group or the like. This photosensitive material is improved in sensitivity, and is also superior in adhesion to conductive substrate as well as mechanical strength such as wear resistance, etc.

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Osaka, Japan

Mitsuo Ihara