Ricoh Company, Ltd.

Other

Tohoku Ricoh Co., Ltd.

Minoru Umeda

Tatsuya Niimi

Katsuichi Ohta

Toshio Fukagai

Kiyoshi Taniguchi

Kayoko Yokoyama

Tomoyuki Shimada

Yohta Sakon

Narihito Kojima

Hiroshi Nagame

Ryuta Takeichi

Ryota Arai

Masao Yoshikawa

Isamu Uchida

Akiyo Namiki

Hiroyuki Ojima

An electrophotographic photoconductor including: an electrically conductive substrate; and at least a photoconductive layer thereon, wherein the photoconductive layer contains a diazapentadiene derivative represented by general formula (1):  

Electrophotographic photoconductor, electrophotographic method, and electrophotographic apparatus

An electrocatalyst for ethanol oxidization includes an elemental mixture containing platinum and ruthenium and at least one element, wherein the foregoing at least one element is selected from the group of tungsten, tin, molybdenum, copper, gold, manganese, and vanadium.

Electrocatalyst for ethanol oxidation and direct ethanol fuel cell using the same

An image display medium including a pair of electroconductive layers, at least one of which is light-transmissive and which are opposed each other to form a cell; and a dispersion contained in the cell, wherein the dispersion includes a colored particulate material having at least one of an acidic group and a basic group; a hydrocarbon solvent; a resin soluble in the hydrocarbon solvent and having at least one of a basic group and an acidic group; and a compound having a nonionic polar group, and wherein when the particulate material has an acidic group, the resin has a basic group, and when the particulate material has a basic group, the resin has an acidic group.

Image display medium and image display device using the image display medium

An electrophotographic photoreceptor including an electroconductive substrate and a photoreceptive layer, which is formed overlying the substrate, wherein the photoreceptive layer includes a charge carrier generation layer including a charge carrier generation material and a charge carrier transport layer including a charge carrier transport material, and wherein when an electric field of from 2.5&times;10 V/cm to 5.5&times;10 V/cm is applied to the charge carrier transport layer, the relationship, t /&mgr; &lE;1.5&times;10 V&middot;s/m, is satisfied, wherein t represents a thickness of the charge carrier transport layer and &mgr; represents a charge mobility of the charge carrier transport layer.

Electrophotographic photoreceptor and electrophotographic image forming method and apparatus using the photoreceptor

An electrophotographic photoconductor including an electroconductive support and a photoconductive layer formed thereon, which has at least a charge generation layer containing a charge generating material and a polymeric charge transporting material, and a charge transport layer containing a polymeric charge transporting material.

Electrophotographic photoconductor

In an electrophotographic process using an electrophotographic photoconductor having a photoconductive layer which contains a charge generation material and a charge transport material, the charge transport material being convertible from a neutral state into a charged state during the photoconduction in the photoconductive layer, when light is applied to the photoconductive layer, there is employed at least one type of rays of light selected from type 1 which has a light emission peak, and type 2 and type 3, each of which has a continuous spectrum with a threshold wavelength value, in such a manner that a half-width wavelength range of type 1 does not overlap a peak wavelength or a half-width wavelength range of an absorption peak of the charge transport material in the charged state, and a half value of a threshold wavelength value of each of type 2 or type 3 is beyond the wavelength or a half-width wavelength range of any of extreme end absorption peaks in terms of the wavelength of the absorption light of the charge transport material in the charged state, and an electrophotographic apparatus for performing the electrophotographic process is provided.

Electrophotographic process and apparatus therefor

An electrophotographic photoconductor is disclosed which includes an electroconductive support, and a photoconductive layer formed thereon and having a charge generation layer and a charge transport layer, wherein the charge generation layer contains a polymeric charge transporting material having an ionization potential of 6.0 eV or less. The photoconductor may include an undercoat layer, an intermediate layer and/or a surface protecting layer, each of which may contain a polymeric charge transporting material. Specific use of the polymeric charge transporting material together with a charge transporting small molecule is also disclosed.

Electrophotographic photoconductor containing polymeric charge

An electrophotographic photoconductor is disclosed, which comprises an electroconductive support and a photoconductive layer comprising (i) a charge generation layer and (ii) a charge transport layer formed on the support, in which the charge generation layer comprises a charge generating material and one component selected from the group consisting of an aliphatic alcohol and a crown ether, or the charge transport layer comprises a charge transporting material and one component selected from the group consisting of an aliphatic alcohol, a polyalkylene glycol, a polyalkylene glycol ester, a polyalkylene glycol ether, and a crown ether.

Electrophotographic photoconductor comprising charge generating and

An electrophotographic photoconductor comprising an electroconductive support, an intermediate layer formed thereon, an a photoconductive layer formed on said intermediate layer, which intermediate layer comprises at least one component selected from the group consisting of: (a) monohydric aliphatic alcohol, (b) dihydric aliphatic alcohol, (c) polyethylene glycol, (d) polypropylene glycol, (e) polybutylene glycol, (f) polyethylene glycol monoester and/or polyethylene glycol diester, (g) polyethylene monoether, (h) crown ether, (i) a random or block copolymer having as structure units a hydroxyethylene group and a hydroxypropylene group, and hydroxyl groups at the terminal thereof, and (j) a polymer of a monomer having formula (I) and a copolymer of said monomer and a counterpart monomer: ##STR1## wherein R.sup.1 represents hydrogen or a methyl group; R.sup.2 represents hydrogen, a lower alkyl group or an unsubstituted or substituted aryl group; and n is an integer of 2 to 100.

Growing community of inventors

Numazu, Japan

Minoru Umeda