Kyocera Mita Corporation

Mita Industrial Co., Ltd.

Yukikatsu Imanaka

Hiroaki Iwasaki

Yuji Tanaka

Eiichi Miyamoto

Mikio Kakui

Hideo Nakamori

Maki Uchida

Masakatsu Hayashi

Yasuyuki Hanatani

Mitsuo Ihara

Tadashi Sakuma

Jun Azuma

Koji Kuramashi

Nariaki Tanaka

Hirofumi Kawaguchi

Yukihiro Ito

Daisuke Kuboshima

Hiromi Nakatsu

Nobuko Akiba

Yuka Nakamura

Teruyo Taguchi

The present invention provides a single-layer type electrophotosensitive material comprising a conductive substrate and a photosensitive layer formed on the conductive substrate, wherein the photosensitive layer contains a phthalocyanine compound as an electric charge generating material, a hole transferring material and an electron transferring material in a binder resin, and that a difference in absolute value between a plus polarity sensitivity and a minus polarity sensitivity measured under the conditions of an exposure wavelength of 780 nm and an exposure energy of 1.0 &#x3bc;J/cmis not more than500312V, and a reversal development type digital image forming apparatus using the electrophotosensitive material, which does not include a charge neutralizing step.

Single-layer type electrophotosensitive material and image forming apparatus using the same

The present invention provides a single-layer type electrophotosensitive material comprising a conductive substrate and a photosensitive layer formed on the conductive substrate, wherein the photosensitive layer contains a phthalocyanine compound as an electric charge generating material, a hole transferring material and an electron transferring material in a binder resin, and that a difference in absolute value between a plus polarity sensitivity and a minus polarity sensitivity measured under the conditions of an exposure wavelength of 780 nm and an exposure energy of 1.0 &#x3bc;J/cmis not more than 500 V, and a reversal development type digital image forming apparatus using the electrophotosensitive material, which does not include a charge neutralizing step.

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 relates to a positive charging single-layer type electrophotosensitive material comprising a conductive substrate and a photosensitive layer formed on the conductive layer, the photosensitive layer containing a phthalocyanine compound as an electric charge generating material, wherein a large half-life exposure between a half-life exposure on positive charging and a half-life exposure on negative charging is four times or less as much as that of the other half-life exposure., and a reversal development type digital image forming apparatus, comprising the electrophotosensitive material, said reversal development type digital image forming apparatus being provided with at least a main charging step, an exposure step, a developing step, a transferring step, a charge neutralizing step and a cleaning step in the forward direction of the electrophotosensitive material, characterized in that the voltage to be applied in the transferring step has a polarity reverse to that of the voltage to be applied in the charging step.

The present invention provides a single-layer type electrophotosensitive material comprising a conductive substrate and a photosensitive layer formed on the conductive substrate, wherein the photosensitive layer contains a phthalocyanine compound as an electric charge generating material, a hole transferring material and an electron transferring material in a binder resin, and that a difference in absolute value between a plus polarity sensitivity and a minus polarity sensitivity measured under the conditions of an exposure wavelength of 780 nm and an exposure energy of 1.0 &mgr;J/cm,is not more than 500 V, and a reversal development type digital image forming apparatus using the electrophotosensitive material, which does not include a charge neutralizing step.

In accordance with the present invention, there is provided a phenanthrylenediamine derivative represented by the general formula (1). The derivative is excellent in the electric charge transferring capability, the compatibility with a binding resin and the stability, thereby providing a photosensitive material which is highly sensitive and excellent in the durability. ##STR1## �wherein R.sup.1, R.sup.2, R.sup.3 and R.sup.4 each represent a halogen atom, an alkyl group, an alkoxy group or an aryl group; and a, b, c and d each represent an integer from 0 to 5!.

Phenanthrylenediamine derivative

The present invention provides a novel naphthylenediamine derivative which is superior in electric charge transferring capability, compatibility with binding resin and stability, and an electrophotosensitive material which has a higher sensitivity and an excellent durability. The above naphthylenediamine derivative is represented by the following general formula (1), and the electrophotosensitive material is formed by providing a photosensitive layer having this naphthylenediamine derivative as an electric charge transferring material on a conductive substrate. ##STR1## wherein R.sup.1 to R.sup.4, R.sup.5a to R.sup.5f and a to d are as defined.

Naphthylenediamine derivative and electrophotosensitive material using

The present invention provides a novel naphthylenediamine derivative which is superior in electric charge transferring capability, compatibility with binding resin and stability. The above naphthylenediamine derivative is represented by the following general formula (1) ##STR1## wherein R.sup.1 to R.sup.4, R.sup.5a to R.sup.5f and a to d are as defined.

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Osaka, Japan

Yukikatsu Imanaka