Mita Industrial Co., Ltd.

Kyocera Mita Corporation

Hiroaki Iwasaki

Yasuyuki Hanatani

Eiichi Miyamoto

Yasufumi Mizuta

Yukikatsu Imanaka

Yuji Tanaka

Akihiko Kawahara

Masakatsu Hayashi

Keisuke Sumida

Yukimasa Watanabe

Keizo Kimoto

Maki Uchida

Nariaki Muto

Hiroaki Sakai

Tadashi Sakuma

Tsuneo Oki

Hiroki Morishita

Koji Kuramashi

Fumio Sugai

Mikio Kakui

Nariaki Tanaka

Sakae Saito

Toshiyuki Fukami

Masashi Tanaka

Hirofumi Kawaguchi

Yukihiro Ito

Hideo Nakamori

Ichiro Yamazato

Masato Katsukawa

Nobuko Akiba

Hiroshi Takemoto

Tatsuo Maeda

Mitsuo Ihara

Syunichi Matsumoto

Yuka Nakamura

Hisakazu Uegaito

Tohru Ueno

Youichi Takesawa

Sakae Saitoh

Shyunichi Matsumoto

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

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.

The present invention provides an electrophotosensitive material comprising a photosensitive layer containing a m-phenylenediamine compound represented by the general formula (1): ##STR1## wherein R.sup.1A and R.sup.1B are the same or different and indicate an alkyl group; and R.sup.1C, R.sup.1D, R.sup.1E and R.sup.1F are the same or different and indicate a hydrogen atom or an alkyl group, which has high sensitivity and issuperior in stability to strong light, durability and heat resistance, and an image forming method capable of realizing more higher speed and more larger energy saving than the prior art.

Electrophotosensitive material and image forming method using the same

An image-forming apparatus using a rubber blade having a rubber hardness of not smaller than 73.degree. for cleaning the residual toner on the photosensitive material drum, wherein a maximum rotational deviation r (mm) of said photosensitive material drum satisfies the following formula,

Image-forming apparatus including a photosensitive material drum and a

An electrophotosensitive material of the present invention is formed by providing a photosensitive layer containing a bis-azo pigment expressed in formula (1): ##STR1## wherein A.sup.1, A.sup.2, R.sup.1 and n are as defined, as a charge generating material, and a diamine compound expressed in formula (2): ##STR2## wherein R.sup.2, R.sup.3, R.sup.4, R.sup.5, R.sup.6 and R.sup.7 p and q k, l, m and o are as defined, as a charge-trasferring material, on a conductive substrate. As a charge generating material, a perylene pigment, anthanthrone pigment, X-type metal-free phthalocyanine pigment, imidazoleperylene pigment or perylene bis-azo pigment are preferable used together with the bis-azo pigment. Thus, photosensitive material is excellent in sensitivity and durability.

Electrophotosensitive material

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 tryptoanthrinimine derivative represented by the general formula (Y): ##STR1## wherein R.sup.A to R.sup.M are as defined. Such a derivative of the general formula (Y) is superior in electron transferring capability. Accordingly, an electrophotosensitive material comprising a photosensitive layer containing this derivative (Y) is superior in sensitivity.

Tryptoanthrinimine derivative and electrophotosensitive material using

An azo compound represented by the following general formula IA and an electrophotographic photosensitive member comprising a photosensitive layer containing the azo compound: ##STR1## wherein R.sup.1 and R.sup.2 are the same or different from each other and indicate a hydrogen atom, an alkyl group, an alkenyl group, a hydroxyl group, an alkoxy group, a carboxy group, an alkoxy carbonyl group, an acyl group, an aryl group, a halogen group or a cyano group, respectively; R.sup.14 indicates a hydrogen atom, a halogen group, an alkyl group, an alkoxy group, an aryl group, an amine group, a cyano group, a nitro group or a sulfoxide group; and A indicates a coupler residue having an acceptor property.

Electrophotographic photosensitive member having a photosensitive layer

An azo compound represented by the following general formula IA and an electrophotographic photosensitive member comprising a photosensitive layer containing the azo compound: ##STR1## wherein R.sup.1 and R.sup.2 are the same or different from each other and indicate a hydrogen atom, an alkyl group, an alkenyl group, a hydroxyl group, an alkoxy group, a carboxy group, an alkoxy carbonyl group, an acyl group, an aryl group, a halogen group or a cyano group, respectively; R.sup.14 indicates a hydrogen atom, a halogen group, an alkyl group, an alkoxy group, an aryl group, an amino group, a cyano group, a nitro group or a sulfoxide group; and A indicates a coupler residue having an acceptor property.

Electrophotographic member having an azo compound with diphenoquinone

Bisazo compounds which contain a diphenoquinone tetraazo component and

The present invention provides a benzidine derivative of the following general formula (1). This derivative is excellent in photostability. Accordingly, when this derivative is contained in a photosensitive layer as an electric charge transferring material, there may be obtained an electrophotosensitive material excellent in photostability. ##STR1##

Benzidine derivative and photosensitive material using said derivative

The present invention provides a hydrazone compound represented by the following general formula (1). This compound has higher hole mobility as compared with an electric charge transferring material such as the conventional hydrazone compound or the like. Accordingly, when this compound is contained in a photosensitive layer as the electric charge transferring material, there may be obtained an electrophotosensitive material excellent in sensitivity, charging ability and repeat characteristics. ##STR1## (wherein R.sup.1, R.sup.2, R.sup.3, R.sup.4 and R.sup.5 are the same as or different from one another, and each is a hydrogen atom, a halogen atom, an alkyl group or an alkoxy group.)

Hydrazone compound and photosensitive material using said compound

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Osaka, Japan

Hiroaki Iwasaki