Konishiroku Photo Industry Co., Ltd.

Konica Corporation

Yoshiaki Takei

Hiroyuki Nomori

Yoshihide Fujimaki

Satoshi Goto

Yoshihiko Etoh

Akira Kinoshita

Takeo Oshiba

Eiichi Sakai

Koichi Kudoh

Naoko Akashi

Asao Matsushima

Tsuneo Wada

Kiyoshi Tamaki

Sohji Shinozaki

Akihiko Itami

Osamu Sasaki

Kiyoshi Sawada

Haruo Iwahashi

Koichi Kudo

Yoshihiko Eto

Yasuo Suzuki

Katumi Matuura

Chikusa Fukumoto

Yoneko Kimura

Ichiro Imaho

Seiji Kurihara

Eiichi Kijima

Tadasu Ichino

Disclosed is an electrophotographic photoreceptor comprising an electrically conductive support and thereon formed a light-sensitive layer containing a carrier generation material, a carrier transport material and a binder resin, wherein said light-sensitive layer comprises a copolymer having a structural unit represented by Formula B.sub.1 and Formula B.sub.2 ; ##STR1## wherein R.sub.1 and R.sub.2 independently represent a hydrogen atom, an alkyl group having 1 to 6 carbon atoms, or an aryl group, R.sub.1 and R.sub.2 may combine together to form a cyclic hydrocarbon residue having 4 to 10 carbon atoms, R.sub.3, R.sub.4, R.sub.5 and R.sub.6 independently represent a hydrogen atom, a halogen atom, an alkyl group having 1 to 6 carbon atoms, a cyclic hydrocarbon residue having 4 to 10 carbon atoms, or an aryl group, l, m, p and q independently represent an integer of 1 to 4. The electrophotographic photoreceptor has high sensitivity and high durability.

Electrophotographic photoreceptor

Disclosed is an electrophotographic photoreceptor comprising a conductive support and provided thereon an intermediate layer, a carrier generation layer and a carrier transport layer, wherein an outermost layer of said electrophotographic photoreceptor contains silica particle each containing an aluminium ingredient of not more than 1000 ppm, a calcium ingredient of not more than 300 ppm and a iron ingredient of not more than 1000 ppm, and said silica particles have a volume average particle size of 0.05 through 5 .mu.m.

Electrophotography photoreceptor

The present invention is directed to a photoreceptor having an electroconductive support, a barrier layer, a charge generation layer and a charge transport layer, all formed on the support in this order, wherein the barrier layer consists of an alcohol-soluble copolymerized polyamide resin, the charge generation layer contains a compound represented by formula I or II, and the charge transport layer contains a polycarbonate resin having a molecular weight of not less than 100,000, ##STR1## wherein Z represents a groups of atoms necessary to form a substituted or unsubstituted divalent aromatic ring.

Photorecptor for electrophotography and image forming method

Disclosed is a method for preparing an electrophotographic photoreceptor comprising the steps of:

Method for preparing an electrophotographic photoreceptor

An image forming apparatus, such as a copier and a printer, for forming a toner image on a recording sheet. The apparatus includes: a photoreceptor for holding the toner image; an image exposure driver for forming a latent image on the photoreceptor; a developer for developing the latent image with a toner so that the toner image is formed on the surface of the photoreceptor; a transferrer for transferring the toner image from the surface of the photoreceptor to the recording sheet; a scraping blade for scraping off a residual toner on the surface of the photoreceptor after the toner image is transferred from the surface to the recording sheet; a toner collection chanber for collecting the residual toner; a toner guide roller for conveying the residual toner from the scraping blade to the toner collecting chanber; in which the toner guide roller is urged onto the surface of the photoreceptor, and the toner guide roller has a surface made of an open-cell cellular material having a pore size between 1 .mu.m and 50 .mu.m.

Toner guide roller for image-forming process and apparatus applied

The improved photoreceptor has a light-sensitive layer that contains as carrier generation materials both a polycylic quinone compound selected from among specified anthanthrone pigments, dibenzpyrene pigments and pyranthrone pigments and a specified bisazo pigment, and that also contains a specified stilbene compound as a carrier transport material. This photoreceptor has good spectral sensitivity characteristics over a broad range of wavelengths, has high sensitivity, has a long cycle life on account of reduced residual potential, is adapted for fast copying processes, and is capable of copying red images with improved fidelity of reproduction.

Photoreceptor comprising the combined use of a quinone and azo compound

An electrophotographic photoreceptor is disclosed. The material comprises a conductive support and, provided thereon, an undercoat layer, a carrier generating layer and a carrier transport layer in this order, wherein said undercoat layer contains an N-alkoxylated polyamide copolymer or N-alkylated polyamide copolymer a unit represented by the following Formula 1:

Electrophotographic photoreceptor comprising an undercoat layer

Electrophotographic photosensitive member

An electrophotographic photoreceptor is disclosed, which is improved in layer casting property, mechanical strength and scratch and abrasion resistance, and also improved in electric property in repetitive use. The photoreceptor is comprised of a support having thereon a photoreceptive layer, and a surface portion of the layer, which is outermost from the support, contains a polycarbonate having at least one of principal repetition units represented by the following formulas I and II, and a compound having a hindered phenol structural unit in the molecules thereof; ##STR1##

Polycarbonate-containing photoreceptors containing a hindered phenol

Image forming method

There is disclosed a photoreceptor which comprises a brominated anthanthrone pigment represented by the structural formula shown below: ##STR1## contained in the photosensitive layer, the brominated anthanthrone pigment exhibiting a X-ray diffraction spectrum having the respective diffraction strengths S (18.4.degree.) and S (26.7.degree.) at 2.theta.=18.4.degree. and 26.7.degree. which satisfy the relationship of

Photoreceptor having photosensitive layer comprising a brominated

A photoreceptor comprising a photosensitive layer and a support, wherein said photosensitive layer contains a polycarbonate compound binder selected from the group consisting of Formula A and B, ##STR1## wherein R.sub.1 and R.sub.2 are independently hydrogen, substituted or unsubstituted aliphatic, or a substituted or unsubstituted hydrocarbon ring, provided that at least one of R.sub.1 and R.sub.2 has at least 3 carbon atoms, Z represents a group of atoms necessary to constitute a substituted or unsubstituted carbon ring or a substituted or unsubstituted heterocyclic ring, R.sub.3 to R.sub.10 in Formulas A and B are independently hydrogen, halogen, substituted or unsubstituted aliphatic, or a substituted or unsubstituted hydrocarbon ring, and n is a number from 10 to 1000.

Photoreceptor having polycarbonate layers and process for the

A photoreceptor for positive charging is disclosed, said photoreceptor comprising a carrier generating material which is stable against both heat and light, has high carrier generating efficiency and provides good photoconductivity over a wide wavelength range and a specific carrier transport material combined in such a manner that the shape of surface potential curves remains essentially constant over a cyclic operation and contributes to the formation of a visible image of high quality in each cycle by reducing the 'memory effect', minimizing the residual potential and extending the cycle life.

Positive charging photorecptor

Disclosed is a light-sensitive member for electrophotography, having a charge generating phase formed by coating a dispersion comprising a charge generating substance, which contains in said charge generating phase an amine in an amount of 20-fold moles or less per mole of said charge generating substance and the solvent. Also disclosed are useful methods for the preparation of such a light-sensitive member.

Light-sensitive member and preparation thereof for use in

There is disclosed an electrophotographic photosensitive member comprising a photosensitive layer comprising a combination of a carrier generating layer and a carrier transporting layer provided on an electroconductive support, the carrier generating layer containing a bisazo compound and the carrier transporting layer containing a styryl compound and/or an amine derivative, a hydrazone compound or a carbazole derivative. The electrophotographic photosensitive member according to the present invention has a high sensitivity and can form constantly good visible images.

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Hachioji, Japan

Yoshiaki Takei