Sensitized Or Doped Patents (Class 430/95)
  • Patent number: 9217938
    Abstract: An electrophotographic photosensitive member includes a support and a charge generating layer and a charge transporting layer formed on the support. The charge generating layer contains an amine compound represented by the following formula (1); where R1 to R5 represent a hydrogen atom, halogen atom, hydroxy group, carboxyl group, alkoxycarbonyl group, aryloxycarbonyl group, alkyl group, alkoxy group, aryloxy group, amino group having a substituent group, or cyclic amino group; and at least one of R1 to R5 is an amino group substituted with an aryl group, amino group substituted with an alkyl group, or cyclic amino group.
    Type: Grant
    Filed: December 9, 2013
    Date of Patent: December 22, 2015
    Assignee: CANON KABUSHIKI KAISHA
    Inventor: Masato Tanaka
  • Patent number: 8486592
    Abstract: A radiation-sensitive material comprising a support and a radiation sensitive composition on the support is disclosed, wherein the radiation sensitive composition includes a dispersion containing nanoparticles of a sensitizer.
    Type: Grant
    Filed: March 22, 2010
    Date of Patent: July 16, 2013
    Assignee: ISP Investments Inc.
    Inventors: Hsiao-Yi Shih, Guojin Lu, David F. Lewis, Xiang Yu
  • Patent number: 7863518
    Abstract: A photovoltaic device capable of improving output characteristics is provided. This photovoltaic device comprises a crystalline semiconductor member, a substantially intrinsic first amorphous semiconductor layer formed on the front surface of the crystalline semiconductor member and a first conductivity type second amorphous semiconductor layer formed on the front surface of the first amorphous semiconductor layer, and has a hydrogen concentration peak in the first amorphous semiconductor layer. Thus, the quantity of hydrogen atoms in the first amorphous semiconductor layer is so increased that the hydrogen atoms increased in quantity can be bonded to dangling bonds of silicon atoms forming defects in the first amorphous semiconductor layer for inactivating the dangling bonds.
    Type: Grant
    Filed: March 8, 2004
    Date of Patent: January 4, 2011
    Assignee: Sanyo Electric Co., Ltd.
    Inventors: Akira Terakawa, Toshio Asaumi
  • Patent number: 6991879
    Abstract: In an electrophotographic photosensitive member comprising a conductive substrate, and provided thereon a photoconductive layer containing at least an amorphous material composed chiefly of silicon atoms and, deposited on the photoconductive layer, a layer region containing an amorphous material composed chiefly of silicon atoms, which layer region contains at least partly a periodic-table Group 13 element, the content of the periodic-table Group 13 element based on the total amount of constituent atoms in the layer region deposited on the photoconductive layer has distribution having at least any two of maximum value(s) and maximum region(s) in the thickness direction of the layer region. This electrophotographic photosensitive member can be improved in charging performance, can prevent image defects due to pressure mars and can form high-quality images over a long period of time.
    Type: Grant
    Filed: August 8, 2003
    Date of Patent: January 31, 2006
    Assignee: Canon Kabushiki Kaisha
    Inventors: Kazuto Hosoi, Hideaki Matsuoka, Satoshi Kojima
  • Patent number: 6815127
    Abstract: A method of electronic processing of an imagewise exposed dispersed particle photoconductive material imaging element employing pulsed radiation and radio frequency photoconductivity apparatus having a sample capacitor with a gap is described, comprising the steps of: a) placing the imagewise exposed photoconductive material imaging element in an electromagnetic field adjacent the sample capacitor; b) scanning the element through the gap in the sample capacitor with a pulsed, focused beam of radiation; c) directly measuring the photoelectron response of the element and recording the resulting signals from the radio frequency photoconductivity apparatus; and d) advancing the element past the capacitor and repeating steps b) and c); wherein the photoconductive material imaging element comprises photoconductive particles which contain deep electron trapping agents which in an unfilled state effectively decrease the photoconductivity of the photoconductor particles, and wherein imagewise exposure of the photocond
    Type: Grant
    Filed: November 15, 2002
    Date of Patent: November 9, 2004
    Assignee: Eastman Kodak Company
    Inventors: Lillian M. Kellogg, Joe E. Maskasky, Dale E. Hamilton
  • Publication number: 20040209179
    Abstract: In an electrophotographic photosensitive member comprising a conductive substrate, and provided thereon a photoconductive layer containing at least an amorphous material composed chiefly of silicon atoms and, deposited on the photoconductive layer, a layer region containing an amorphous material composed chiefly of silicon atoms, which layer region contains at least partly a periodic-table Group 13 element, the content of the periodic-table Group 13 element based on the total amount of constituent atoms in the layer region deposited on the photoconductive layer has distribution having at least any two of maximum value(s) and maximum region(s) in the thickness direction of the layer region. This electrophotographic photosensitive member can be improved in charging performance, can prevent image defects due to pressure mars and can form high-quality images over a long period of time.
    Type: Application
    Filed: August 8, 2003
    Publication date: October 21, 2004
    Inventors: Kazuto Hosoi, Hideaki Matsuoka, Satoshi Kojima
  • Patent number: 6753121
    Abstract: A photoconductive material imaging element is described comprising a support and a silver halide emulsion imaging layer comprising silver halide grains which have not been chemically sensitized to optimize formation of latent image Agno, centers upon imagewise exposure and which are doped with at least 500 deep electron trapping agent dopant centers per grain. In accordance with a preferred embodiment, the photoconductive material imaging element includes a planar support and the non-chemically sensitized, deep electron trapping agent doped silver halide grains comprise tabular grains, preferably with an average grain size equivalent circular diameter of greater than 2 &mgr;m, with the long dimensions of the tabular grains primarily oriented parallel to the plane of the support.
    Type: Grant
    Filed: November 15, 2002
    Date of Patent: June 22, 2004
    Assignee: Eastman Kodak Company
    Inventors: Lillian M. Kellogg, Joe E. Maskasky, Dale E. Hamilton
  • Publication number: 20040096763
    Abstract: A photoconductive material imaging element is described comprising a support and a silver halide emulsion imaging layer comprising silver halide grains which have not been chemically sensitized to optimize formation of latent image Agn0 centers upon imagewise exposure and which are doped with at least 500 deep electron trapping agent dopant centers per grain. In accordance with a preferred embodiment, the photoconductive material imaging element includes a planar support and the non-chemically sensitized, deep electron trapping agent doped silver halide grains comprise tabular grains, preferably with an average grain size equivalent circular diameter of greater than 2 &mgr;m, with the long dimensions of the tabular grains primarily oriented parallel to the plane of the support.
    Type: Application
    Filed: November 15, 2002
    Publication date: May 20, 2004
    Applicant: Eastman Kodak Company
    Inventors: Lillian M. Kellogg, Joe E. Maskasky, Dale E. Hamilton
  • Publication number: 20030235771
    Abstract: A single layered electrophotographic photoreceptor includes a photosensitive layer having at least a charge generating material, a hole transporting material, an electron transporting material, and a binder on a conductive support. The photosensitive layer includes a peculiar charge transfer complex (CT-complex) formed by the hole transporting material and the electron transporting material.
    Type: Application
    Filed: June 4, 2003
    Publication date: December 25, 2003
    Applicant: SAMSUNG Electronics Co., Ltd.
    Inventors: Saburo Yokota, Hwan-Koo Lee, Kyung-Yol Yon, Beom-Jun Kim, Nam-Jeong Lee
  • Patent number: 6472055
    Abstract: A direct drawing type lithographic printing plate precursor comprising a water-resistant support having provided thereon an image-receiving layer, the image-receiving layer containing: at least one metal oxide hydrate having an average particle size of from 0.01 to 5 pm and comprising a metal atom selected from Mg, Al, Zn, Ge, Ti, Co, Zr, Sn, Fe, Cu, Ni, Pb, Pd, Cd, Mo, Cr, Ga, Mn, V, Ce and La; and a binder resin containing a complex comprising: a resin containing a siloxane bond in which a silicon atom is connected with an oxygen atom; and an organic polymer containing a group capable of forming a hydrogen bond with the resin containing a siloxane bond.
    Type: Grant
    Filed: November 9, 1999
    Date of Patent: October 29, 2002
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Hiroshi Tashiro, Eiichi Kato
  • Publication number: 20010023046
    Abstract: A polarization reversion pattern is formed in ferroelectrics in accordance with image information. An image is obtained by surface charges corresponding to the polarization reversion pattern. The ferroelectrics are composed of an inorganic ferroelectric oxide such as LiNbxTa1-xO3 (0≦x≦1).
    Type: Application
    Filed: March 16, 2001
    Publication date: September 20, 2001
    Inventor: Yasukazu Nihei
  • Patent number: 6228545
    Abstract: A selenium photoconductor has a charge transport layer and a charge generation layer formed on a conductive substrate. Both the charge generation layer and the charge transport layer are made from a selenium-arsenic alloy, with the charge generation layer having a concentration of arsenic greater than the concentration of arsenic in the charge transport layer. This concentration distribution results in a photoconductor having excellent charge-generation efficiency and mobility. In an alternate embodiment, a halogen is doped into the charge generation layer and charge transport layer. The resulting photoconductor is useful in large-scale, high speed printing operations.
    Type: Grant
    Filed: June 3, 1999
    Date of Patent: May 8, 2001
    Assignee: Fuji Electric Co., Ltd.
    Inventors: Makoto Fujii, Hideki Kina
  • Patent number: 6171643
    Abstract: A method for producing a multilayer plate for X-ray imaging is disclosed. As the first step in the method, there is provided a plate of a substrate. Then, there is deposited on this substrate a thin film of amorphous arsenic triselenide by thermal evaporation under reduced pressure, followed by condensation on the substrate. A thick photoconductive film of doped amorphous selenium is then deposited by evaporation and condensation on the thin layer of amorphous arsenic triselenide. This thick photoconductive film can also be deposited directly onto the substrate. Then, a thin film of alkali doped selenium is deposited onto the thick photoconductive layer by evaporation or co-evaporation and condensation, and a conducting biasing electrode is formed on top of this alkali doped film.
    Type: Grant
    Filed: November 20, 1998
    Date of Patent: January 9, 2001
    Assignee: FTNI Inc.
    Inventors: Bradley Trent Polischuk, Alain Jean
  • Patent number: 6110629
    Abstract: A cylindrical, photosensitive member is disclosed which has a photosensitive layer comprising amorphous silicon provided on an electroconductive substrate, and in which the thickness of the electroconductive substrate is not less than 0.1 mm but less than 2.5 mm, thereby accomplishing cost reduction of the photosensitive member and also accomplishing prevention of variations of image density and image smearing by high-accuracy temperature control.
    Type: Grant
    Filed: May 13, 1999
    Date of Patent: August 29, 2000
    Assignee: Canon Kabushiki Kaisha
    Inventors: Toshiyuki Ehara, Yuji Nakayama, Tetsuya Karaki, Hironori Owaki
  • Patent number: 6110631
    Abstract: There is disclosed a photoconductor for use in an electrophotographic apparatus. The photoconductor includes a conductive substrate and a photoconductive layer formed on the conductive substrate. The photoconductive layer includes an As.sub.2 Se.sub.3 alloy containing 36% to 40% by weight of As and doped with 1,000 to 20,000 parts per million of iodine. A method of manufacturing a photoconductor is also disclosed, which includes forming a photoconductive layer by vapor deposition on a conductive substrate and thermally treating the photoconductive layer at a temperature between 100 and 200 degrees Celsius for a period between 30 and 80 minutes. Advantageously, the photoconductor of the present invention is able to provide high quality images at high printing speeds.
    Type: Grant
    Filed: May 14, 1998
    Date of Patent: August 29, 2000
    Assignee: Fuji Electric Co., Ltd.
    Inventors: Akio Arai, Makoto Fujii, Kazuya Adachi
  • Patent number: 6090513
    Abstract: An electrophotographic light-receiving member comprising a conductive support and a light-receiving layer having a photoconductive layer showing a photoconductivity, formed on the conductive support and formed of a non-monocrystalline material mainly composed of a silicon atom and containing at least one of a hydrogen atom and a halogen atom, wherein said photoconductive layer contains from 10 atomic % to 30 atomic % of hydrogen, the characteristic energy of exponential tail obtained from light absorption spectra at light-incident portions at least of the photoconductive layer is from 50 meV to 60 meV, and the density of states of localization in the photoconductive layer is from 1.times.10.sup.14 cm.sup.-3 to 1.times.10.sup.16 cm.sup.-3. Since the in-gap levels of the photoconductive layer has been controlled, the light-receiving member can be improved in environmental stability and exposure memory at the same time and have superior potential characteristics and image characteristics.
    Type: Grant
    Filed: March 27, 1997
    Date of Patent: July 18, 2000
    Assignee: Canon Kabushiki Kaisha
    Inventors: Hiroaki Niino, Koji Hitsuishi, Satoshi Kojima
  • Patent number: 6045958
    Abstract: A first selenium-arsenic layer of a photoconductor, deposited on a conductive substrate, has a thickness and arsenic concentration effective to preserve an electrically charged surface potential in darkness and to transport carriers generated on exposure to light. The first layer is between 20 to 70 .mu.m thick. A second amorphous selenium-arsenic alloy layer, formed on the first layer, generates carriers on exposure to light. The surface roughness, Rmax., of the conductive substrate is less than or equal to 0.5 .mu.m. The first layer, or both of the photoconductive layers, are doped with iodine. When both layers contain iodine, the iodine content of the second layer is equal to or less than that of the first layer. The thickness of the second layer is between 5 to 30 .mu.m. The arsenic content of the amorphous selenium-arsenic alloy of the second layer is equal to or greater than that in the first layer. After deposition of the first and second layers, the photoconductor is heat treated at between 100.
    Type: Grant
    Filed: February 1, 1999
    Date of Patent: April 4, 2000
    Assignee: Fuji Electric Co., Ltd.
    Inventors: Akio Arai, Hideki Kina
  • Patent number: 5821021
    Abstract: A photosensitive material for electrophotography, wherein the charge-generating agent comprises a P-type charge-generating pigment and an N-type charge-generating pigment in combination, at least part of these pigments being present in the form of aggregates in the photosensitive layer. The photosensitive material will assume the form of either a single dispersion type or a laminated layer type, and exhibits very high carrier generation efficiency, strikingly improved sensitivity on the side of long wavelengths, excellent balance in the spectral sensitivity and property after repetitively used, and can hence be effectively used for forming image by the electrophotography.
    Type: Grant
    Filed: January 30, 1997
    Date of Patent: October 13, 1998
    Assignee: Mita Industrial Co., Ltd.
    Inventor: Akihiko Kawahara
  • Patent number: 5770340
    Abstract: A method for forming an image using scanning exposure of an electrophotographic lithographic printing plate comprising an electrically conductive support having thereon a photoconductive layer containing an inorganic photoconductor, a chemical sensitizer, a sensitizing dye and a binder resin, and a back layer on the opposite side of the photoconductive layer, wherein the back layer has a surface resistivity of 1.times.10.sup.10 .OMEGA. or less and the sensitizing dye in the photoconductive layer is at least one selected from the compounds represented by formulae (I) and (II) defined in the disclosure.
    Type: Grant
    Filed: December 27, 1995
    Date of Patent: June 23, 1998
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Takao Nakayama, Eiichi Kato, Kazuo Ishii
  • Patent number: 5741615
    Abstract: A light receiving member comprising a substrate and a light receiving layer disposed on said substrate, said light receiving layer being composed of a non-Si (H,X) material containing silicon atoms (Si) as a matrix and at least one kind of atoms selected from the group consisting of hydrogen atoms (H) and halogen atoms (X), characterized in that said light receiving layer further contains at least chromium atoms (Cr), iron atoms (Fe)f nickel atoms (Ni), sodium atoms (Na), and magnesium atoms (Mg) respectively in an amount of 0.9 atomic ppm or less.The light receiving member is suitable for use as electronic devices such as electrophotographic light receiving members, solar cells, and the like, wherein it stably and continuously exhibits desirable characteristics without being deteriorated even upon repeated use over a long period of time.
    Type: Grant
    Filed: June 2, 1994
    Date of Patent: April 21, 1998
    Assignee: Canon Kabushiki Kaisha
    Inventors: Keishi Saitoh, Kozo Arao, Tatsuyuki Aoike
  • Patent number: 5677098
    Abstract: A method for forming an image using beam exposure of an electrophotosensitive material comprising an electrically conductive support having thereon an electrophotosensitive layer containing an inorganic photoconductor, a chemical sensitizer, a spectral sensitizing dye and a binder resin, wherein the spectral sensitizing dye is at least one dye selected from the compounds represented by formulae (I) and (II) defined in the disclosure and the surface of the electrically conductive support on the side of the electrophotosensitive layer has a BEKK smoothness of 300 sec/10 cc or more.
    Type: Grant
    Filed: December 27, 1995
    Date of Patent: October 14, 1997
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Takao Nakayama, Eiichi Kato, Kazuo Ishii
  • Patent number: 5658703
    Abstract: A layer of amorphous silicon containing H, preferably 10-40 atomic % H, is used as a photoconductive layer for electrophotographic photosensitive member.
    Type: Grant
    Filed: June 7, 1995
    Date of Patent: August 19, 1997
    Assignee: Canon Kabushiki Kaisha
    Inventors: Yutaka Hirai, Toshiyuki Komatsu, Katsumi Nakagawa, Teruo Misumi, Tadaji Fukuda
  • Patent number: 5656407
    Abstract: A photosensitive material for electrophotography, wherein the charge-generating agent comprises a P-type charge-generating pigment and an N-type charge-generating pigment in combination, at least part of these pigments being present in the form of aggregates in the photosensitive layer. The photosensitive material will assume the form of either a single dispersion type or a laminated layer type, and exhibits very high carrier generation efficiency, strikingly improved sensitivity on the side of long wavelengths, excellent balance in the spectral sensitivity and property after repetitively used, and can hence be effectively used for forming image by the electrophotography.
    Type: Grant
    Filed: June 27, 1994
    Date of Patent: August 12, 1997
    Assignee: Mita Industrial Co., Ltd.
    Inventor: Akihiko Kawahara
  • Patent number: 5624776
    Abstract: An electrophotographic photosensitive member comprising a substrate and a light receiving layer composed of a silicon-containing non-single crystal material disposed on said substrate, characterized in that said light receiving layer contains a plurality of columnar structure regions each grown from a nucleus situated in said light receiving layer wherein said plurality of columnar structure regions are arranged substantially in parallel to the thicknesswise direction of said light receiving layer and at a density in the range of 5/cm.sup.2 to 500/cm.sup.2.
    Type: Grant
    Filed: February 18, 1994
    Date of Patent: April 29, 1997
    Assignee: Canon Kabushiki Kaisha
    Inventors: Tetsuya Takei, Hirokazu Ohtoshi, Takehito Yoshino, Ryuji Okamura, Yasuyoshi Takai
  • Patent number: 5573884
    Abstract: An image-forming member for electro-photography has a photoconductive layer comprising a hydrogenated amorphous semiconductor composed of silicon and/or germanium as a matrix and at least one chemical modifier such as carbon, nitrogen and oxygen contained in the matrix.
    Type: Grant
    Filed: June 6, 1995
    Date of Patent: November 12, 1996
    Assignee: Canon Kabushiki Kaisha
    Inventors: Toshiyuki Komatsu, Yutaka Hirai, Katsumi Nakagawa, Tadaji Fukuda
  • Patent number: 5573879
    Abstract: An electrophotographic light-sensitive material which has improved electrostatic characteristics and image forming performance and is excellent particularly in reproducibility of highly accurate image using a liquid developer and image forming performance upon a scanning exposure system using a laser beam of a low power.The electrophotographic light-sensitive material contains, as a binder resin, at least one resin (A) which has a weight average molecular weight of from 1.times.10.sup.3 to 2.times.10.sup.4 and contains not less than 30% by weight of a polymer component of the formula (I) and from 0.5 to 15% by weight of a specified polar group-containing polymer component and at least one resin (B) which is a starlike polymer having a weight average molecular weight of from 3.times.10.sup.4 to 1.times.10.sup.6 and comprising an organic molecule having bonded thereto at least three polymer chains each containing a polymer component containing a specified polar group and a polymer component of the formula (I).
    Type: Grant
    Filed: November 2, 1993
    Date of Patent: November 12, 1996
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Eiichi Kato, Kazuo Ishii
  • Patent number: 5545500
    Abstract: There is provided an improved light receiving member comrpsing a substrate and a light receiving layer formed by laminating a first layer having photoconductivity which is constituted with an amorphous material containing silicon atoms as the main constituent atoms and germanium atoms, and a second layer constituted with an amorphous material containing silicon atoms, carbon atoms and an element for controlling the conductivity. The germanium atoms contained in the first layer are in the state of being unevenly distributed in the entire layer region or in the partial layer region adjacent to the substrate. The first layer may contain one or more kinds selected from an element for controlling the conductivity, oxygen atoms and nitrogen atoms in the entire layer region on in the partial layer region.
    Type: Grant
    Filed: May 19, 1994
    Date of Patent: August 13, 1996
    Assignee: Canon Kabushiki Kaisha
    Inventors: Shigeru Shirai, Shigeru Ohno
  • Patent number: 5516611
    Abstract: In order to improve characteristics of a light-receiving member for electrophotography having a photoconductive layer comprising an amorphous silicon material and implement a method for facilitating designing of a layer structure, the present invention provides a light-receiving member which is formed by depositing in sequence a photoconductive layer which comprises a non-monocrystalline material comprising silicon atoms as a main element and a surface layer on a conductive substrate, wherein the photoconductive layer comprises at least hydrogenated amorphous silicon which contains at least carbon atoms and boron atoms and the boron atom content in the photoconductive layer in a direction of film thickness is varied in a correlation of exponential functions with respect to the carbon atom content in the photoconductive layer in the direction of film thickness, and a method for producing the light-receiving member by forming a layer while controlling a charge of a starting gas for the boron atoms in the correl
    Type: Grant
    Filed: April 8, 1994
    Date of Patent: May 14, 1996
    Assignee: Canon Kabushiki Kaisha
    Inventors: Satoshi Kojima, Hirokazu Ohtoshi, Hitoshi Murayama
  • Patent number: 5459005
    Abstract: An electrophotographic light-sensitive material which is excellent in image reproducibility, moisture resistance and anti-abrasion property, provides clear images of good quality and is particularly useful in a scanning exposure system using a semiconductor laser beam is provided.The electrophotographic light-sensitive material contains, as a binder resin, a resin (A) which has an acid value of from 5 to 120 and contains a component of the formula (I) shown below and a specified polar group-containing component and a resin (B) which is an AB or ABA block copolymer comprising an A block containing a component of the formula (II) shown below and a B block containing a component derived from a specific macromonomer having a specified polar group.In the formulae (I) and (II) below, a.sup.1 and a.sup.2 each represents a hydrogen atom, a halogen atom, a cyano group, a hydrocarbon group, --COOR.sup.4 or --COOR.sup.4 bonded via a hydrocarbon group (R.sup.4 represents a hydrocarbon group); and R.sup.11 and R.sup.
    Type: Grant
    Filed: February 3, 1994
    Date of Patent: October 17, 1995
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Eiichi Kato, Kazuo Ishii
  • Patent number: 5446563
    Abstract: A photoconductor coupled liquid crystal light valve having at least a photoconductive layer, an optical reflection layer, and a liquid crystal layer between a pair of electrodes, wherein the photoconductive layer is made of amorphous silicon layer, and an impurity doped in the photoconductive layer is uniform in amount in the in-plane direction of the photoconductive layer and continuously higher in concentration in the layer-thickness direction from the electrode side toward the optical reflection layer side.
    Type: Grant
    Filed: March 9, 1993
    Date of Patent: August 29, 1995
    Assignee: Sharp Kabushiki Kaisha
    Inventor: Hayakawa Takashi
  • Patent number: 5436101
    Abstract: An x-ray photoreceptor for use in a xerographic system having a high arsenic layer 5 to 40 microns in thickness between the substrate and the selenium layer for trapping positive charge injected from the interface. Since this positive charge otherwise tends to discharge a negatively charged plate, the provision of this trapping layer will allow the plate to be used for either positive or negative charging.
    Type: Grant
    Filed: August 20, 1993
    Date of Patent: July 25, 1995
    Assignee: Xerox Corporation
    Inventors: William D. Fender, Eddie M. Zanrosso
  • Patent number: 5407768
    Abstract: An electrophotographic light-receiving member comprising a conductive substrate 101 and laminated thereto a non-monocrystalline material photoconductive layer 102 and a surface layer 103. The photoconductive layer 102 is mainly composed of silicon atoms and contains at least carbon atoms and hydrogen atoms. The percentage of carbon atoms having a carbon-carbon bond in the photoconductive layer is controlled to be not more than 60% based on the whole carbon atoms contained therein, and, in an instance in which a blocking layer 104 is provided between the conductive substrate 101 and the photoconductive layer 102, the percentage of carbon atoms having a carbon-carbon bond in the blocking layer is also controlled. This makes it possible to prevent clusters of carbon atoms from being formed in the photoconductive layer or blocking layer.
    Type: Grant
    Filed: April 23, 1993
    Date of Patent: April 18, 1995
    Assignee: Canon Kabushiki Kaisha
    Inventors: Kazuyoshi Akiyama, Masaaki Yamamura, Ryuji Okamura, Koji Hitsuishi
  • Patent number: 5382488
    Abstract: An electrophotographic light-sensitive material which has improved electrostatic characteristics and image forming performance and is excellent particularly in reproducibility of highly accurate image using a liquid developer and image forming performance upon a scanning exposure system using a laser beam of a low power.The electrophotographic light-sensitive material contains, as a binder resin, a low molecular weight resin (A) comprising an organic molecule having bonded thereto at least three polymer chains each containing a polymer component of formula (I) and a polymer component having a specified polar group, and a resin (B) which is a medium to high molecular weight AB block copolymer comprising an A block containing a specified polar group and a B block containing a polymer component of formula (I). ##STR1## wherein a.sup.1 and a2: hydrogen, halogen, a cyano group, a hydrocarbon group, --COOR.sup.4 or --COOR.sup.4 bonded via a hydrocarbon group (R.sup.4 : hydrocarbon group); and R.sup.
    Type: Grant
    Filed: May 18, 1993
    Date of Patent: January 17, 1995
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Eiichi Kato, Kazuo Ishii
  • Patent number: 5382487
    Abstract: An image forming member for electrophotography constructed with a substrate and a photoconductive layer formed thereon, wherein the photoconductive layer comprising an amorphous material containing therein silicon atom as the matrix and halogen atom as the constituent atom.
    Type: Grant
    Filed: May 6, 1994
    Date of Patent: January 17, 1995
    Assignee: Canon Kabushiki Kaisha
    Inventors: Tadaji Fukuda, Toshiyuki Komatsu
  • Patent number: 5353139
    Abstract: A spatial light modulator capable of providing high contrast ratio and resolution moving pictures without an after-image effect is disclosed. The spatial light modulator comprises a pair of transparent electrodes for forming a driving electric field therebetween, and at least one photo-modulation member and a photoconductive member laminated between the pair of transparent electrodes, where the photoconductive member comprises a hydrogenated amorphous silicon film having thickness of 10 .mu.m to 30 .mu.m, and is doped with boron as such that an amount of the boron in the hydrogenated amorphous silicon film in atomic ratio with respect to silicon therein is 0.1 ppm to 1 ppm.
    Type: Grant
    Filed: November 17, 1992
    Date of Patent: October 4, 1994
    Assignee: Victor Company of Japan, Ltd.
    Inventors: Nozomu Ohkouchi, Hiromitsu Takenaka, Tadayuki Shimada, Shigeo Shimizu, Toshio Konno
  • Patent number: 5338628
    Abstract: An electrophotographic light-sensitive material comprising a support having provided thereon at least one photoconductive layer containing an inorganic photoconductive substance, a spectral sensitizing dye and a binder resin, wherein the binder resin comprises at least one resin (A) and at least one resin (B) as described in the specification.
    Type: Grant
    Filed: September 15, 1992
    Date of Patent: August 16, 1994
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Eiichi Kato, Kazuo Ishii
  • Patent number: 5278015
    Abstract: An amorphous silicon film contains not less than 30 at. % hydrogen and includes silicon atoms joined with one hydrogen atom and silicon atoms joined with two hydrogen atoms, the ratio of the silicon atoms joined with two hydrogen atoms to the silicon atoms joined with one hydrogen atom being not more than 0.4. This amorphous silicon films is produced by performing plasma-assisted chemical vapor deposition at a substrate temperature of not more than 100.degree. C., while supplying hydrogen and silane in the predetermined ratio, the ratio of the flow of hydrogen to that of silane being not less than 1.
    Type: Grant
    Filed: July 23, 1992
    Date of Patent: January 11, 1994
    Assignee: Sango Electric Co., Ltd.
    Inventors: Masayuki Iwamoto, Koji Minami, Toshihiko Yamaoki
  • Patent number: 5236797
    Abstract: Electrophotographic elements contain certain chemical compounds as electron-transport agents, which are substituted derivatives of phospha-2,5-cyclohexadiene. These compounds have good solubility or dispersibility in organic solvents and polymeric binders, and they exhibit good electron-transport properties in electrophotographic elements.
    Type: Grant
    Filed: June 9, 1992
    Date of Patent: August 17, 1993
    Assignee: Eastman Kodak Company
    Inventors: Teh-Ming Kung, Chin H. Chen
  • Patent number: 5229240
    Abstract: An electrophotographic light-sensitive material comprising a support having provided thereon a photoconductive layer containing at least an inorganic photoconductive substance, a spectral sensitizer and a binder resin, wherein the binder resin contains (1) at least one resin (Resin (A)) having a weight average molecular weight of from 1.times.10.sup.3 to 1.times.10.sup.4 which contains at least 30% by weight of a polymer component represented by the general formula (I) described below and from 0.1 to 10% by weight of a polymer component containing at least one acidic group selected from ##STR1## (wherein R represents a hydrocarbon group or --OR' (wherein R' represents a hydrocarbon group) and a cyclic acid anhydride-containing group, and (2) at least one resin (Resin (B)) having a weight average molecular weight of 5.times.10.sup.
    Type: Grant
    Filed: May 17, 1991
    Date of Patent: July 20, 1993
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Eiichi Kato, Seishi Kasai, Kazuo Ishii
  • Patent number: 5173386
    Abstract: The present invention provides novel titanium dioxide aggregates especially suitable for an electrophotographic photosensitive material. This titanium dioxide aggregates comprise sintered aggregates of fine primary particles and have a rutile type crystal structure and an oil absorption of 35-65. This titanium dioxide aggregates which are treated with a mineral acid is also provided. There is also provided an electrophotograpic photosensitive material which contains such titanium dioxide in a photosensitive layer.
    Type: Grant
    Filed: December 28, 1989
    Date of Patent: December 22, 1992
    Assignee: Ishihara Sangyo Kaisha, Ltd.
    Inventor: Sadao Murasawa
  • Patent number: 5164276
    Abstract: Photoreceptors, charge generation layers and charge transport layers, in which the charge generation layer or charge transport layer includes a dopant of organic molecules containing basic electron donor or proton acceptor groups, and processes for the formation thereof. Preferred dopants include aliphatic and aromatic amines, more preferably, triethanolamine, n-dodecylamine, n-hexadecylamine, tetramethyl guanidine, 3-aminopropyltriethoxy silane, 3-aminopropyltrihydroxysilane and its oligomers.
    Type: Grant
    Filed: November 27, 1990
    Date of Patent: November 17, 1992
    Assignee: Xerox Corporation
    Inventors: Charles C. Robinson, Anita P. Lynch, Emery G. Tokoli, Susan Robinette, Kathleen M. Carmichael
  • Patent number: 5145759
    Abstract: An electrophotographic recording material comprising on an electrically conductive support a negatively chargeable photoconductive recording layer which contains in an electrically insulating organic polymer binder material at least one photoconductive n-type pigment substance and at least one p-type photoconductive charge transport substance as defined herein by a general formula (I) to (V), wherein said layer has a thickness in the range of 4 to 40 .mu.m and comprises 8 to 80% by weight of said n-type pigment substance and 0.01 to 40% by weight of said p-type charge transport substance that is molecularly distributed in said electrically insulating organic polymeric binder material that has a voluem resistivity of at least 10.sup.14 Ohm-m, and wherein said recording layer in electrostatically charged state requires for 10% and 90% discharge respectively exposures to conductivity increasing electromagnetic radiation that differ by a factor 4.5 or less.
    Type: Grant
    Filed: April 16, 1990
    Date of Patent: September 8, 1992
    Assignee: AGFA-Gevaert, N.V.
    Inventors: David R. Terrell, Stefaan K. De Meutter, Marcel J. Monbaliu
  • Patent number: 5112712
    Abstract: This invention provides an electrophotographic photosensitive material comprising a conductive support having thereon a photoconductive layer containing at least an inorganic photoconductor and a binder resin, wherein the photoconductive layer contains an N-hydroxyimide compound represented by the following general formula (I): ##STR1## wherein Z represents an organic residue capable of forming a cyclic compound having a saturated or unsaturated bond, thereby increasing its photosensitivity and improving its chargeability, dark charge retentivity and photosensitivity over a wide range from visible to infrared regions. Upon actual reproduction, the inventive material provides a fog-free and clear image even under severe conditions such as high temperature and high humidity conditions (e.g., 30.degree. C. and 80% RH).
    Type: Grant
    Filed: October 19, 1990
    Date of Patent: May 12, 1992
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Seishi Kasai, Kazuo Ishii, Eiichi Kato
  • Patent number: 5106711
    Abstract: The present invention relates to an electrophotographic sensitive member comprising a photoconductive amorphous silicon carbide layer.An amorphous silicon layer has superior abrasion resistance, heat resistance, antipollution property, photosensitive characteristic and the like.However, an amorphous silicon layer itself has a low dark resistance, so that dopants, such as boron, are added thereto but a dark resistance of 10.sup.12 .OMEGA..multidot.cm or more required for the case where it is used as an electrophotographic sensitive member has never been obtained.The present inventors have found before that an amorphous silicon carbide layer has a large carrier-mobility and photoconductivity and its dark resistance of 10.sup.13 .OMEGA..multidot.cm or more can be easily obtained regardless of the existence of dopants and furthermore an electrophotographic sensitive member, which can be positively and negatively charged by the selection of the dopants, can be obtained.
    Type: Grant
    Filed: April 12, 1989
    Date of Patent: April 21, 1992
    Assignees: Kyocera Corporation, Takao Kawamura
    Inventors: Takao Kawamura, Naooki Miyamoto, Hitoshi Takemura, Satoru Watanabe, Kokichi Ishibitsu
  • Patent number: 5104758
    Abstract: An electrophotographic photoreceptor comprising an electrically conductive substrate having thereon a photosensitive layer is disclosed, wherein the photosensitive layer contains, as a charge generating material, a dispersion of selenium or a selenium alloy and at least one squarylium compound represented by formula (I): ##STR1## wherein A represents a fluorine atom, a hydrogen atom or a hydroxyl group, with B representing a hydroxyl group; or A represents a hydrogen atom or a fluorine atom, with B representing a methyl group, in the same binder resin. The electrophotographic photoreceptor not only has broad spectral sensitivity from the visible to infrared region but is excellent in other electrophotographic properties.
    Type: Grant
    Filed: May 11, 1990
    Date of Patent: April 14, 1992
    Assignee: Fuji Xerox Co, Ltd.
    Inventors: Kiyokazu Mashimo, Ryosaku Igarashi, Ichiro Takegawa, Yasuo Sakaguchi, Shigetoshi Nakamura, Kohichi Yamamoto
  • Patent number: 5098809
    Abstract: An electrophotographic photosensitive member comprises a conductive support and a photosensitive layer provided thereon. The photosensitive layer contains a fluorene compound represented by the following Formula (I): ##STR1## wherein R.sub.1 and R.sub.2 each represent an alkyl group; R.sub.3 represents a hydrogen atom, an alkyl group, an alkoxy group or a halogen atom; R.sub.4 and R.sub.5 each represent a hydrogen atom, an alkyl group, an aralkyl group or an aryl group.
    Type: Grant
    Filed: February 28, 1990
    Date of Patent: March 24, 1992
    Assignee: Canon Kabushiki Kaisha
    Inventors: Toshihiro Kikuchi, Akihiro Senoo, Tetsuro Kanemaru, Ryoji Yashiro
  • Patent number: 5089367
    Abstract: Disclosed is an electrophotographic photoreceptor which is superior in sensitivity to light of longer wavelength region with good stability of the sensitivity and is suitable for formation of high quality color image by scanning exposure with laser beam. This photoreceptor comprises an electroconductive support and, provided thereon, a photosensitive layer containing a titanium dioxide sensitive to light of longer wavelengths which is obtained by treating the surface of titanium dioxide particles with a mineral acid and then supporting on the surface of the particles a cyanine dye sensitizer and a hydrophobic organic compound. The mineral acid is preferably hydrofluoric acid and the hydrophobic organic compound is preferably aromatic or aliphatic organic acid and acid anhydride thereof.
    Type: Grant
    Filed: January 29, 1990
    Date of Patent: February 18, 1992
    Assignee: Ishihara Sangyo Kaisha, Ltd.
    Inventors: Sadao Murasawa, Yoshio Hirobe, Hitoshi Ando
  • Patent number: 5085959
    Abstract: An electrophotographic photoreceptor having a good printing quality can be provided by a photoreceptor comprising a charge transporation layer composed of a photosensitive material containing a hole mobility enhancing material. Thus, in accordance with an emboidment of the invention, it is possible to rapidly attenuate negative charge and to obtain a photoreceptor having a good printing quality by adding a hole mobility enhancing material to the CTL without producing a difference in print density between regions of the photoreceptor between sheets of paper and covered with a sheet. Some metal oxides and acids, such as WO.sub.2, WO.sub.3, MnO.sub.4, H.sub.3 PO.sub.3, H.sub.2 SO.sub.3 and HAsO.sub.2, are found to have a hole mobility enhancing effect to a CTL of a selenium alloy. Some metal elements, such as Sn, Co, Pb, Fe, Cu, Hg, Ag and Ce, are also found to have a hole mobility enhancing effect to the CTL. Finally, halogen elements are also found to have a hole mobility enhancing effect to the CTL.
    Type: Grant
    Filed: August 9, 1989
    Date of Patent: February 4, 1992
    Assignee: Fuji Electric Co., Ltd.
    Inventor: Urabe Kazuyuk
  • Patent number: RE35198
    Abstract: Image-forming member for electrophotography comprising a charge generation layer composed of hydrogenated amorphous silicon.
    Type: Grant
    Filed: September 15, 1993
    Date of Patent: April 2, 1996
    Assignee: Canon Kabushiki Kaisha
    Inventors: Katsumi Nakagawa, Toshiyuki Komatsu, Yutaka Hirai, Teruo Misumi, Tadaji Fukuda
  • Patent number: RE35246
    Abstract: A photosensitive material for electrophotography is provided, which comprises in sequence an electroconductive substrate, a carrier transport layer composed of a selenium-arsenic alloy, a carrier generation layer composed of a selenium-tellurium alloy and a surface coating layer composed of a selenium-arsenic alloy. The present invention further relates to a photosensitive material having a carrier transport layer that is doped with iodine as well.
    Type: Grant
    Filed: December 21, 1993
    Date of Patent: May 21, 1996
    Assignee: Fuji Electric Co., Ltd.
    Inventor: Mitsuru Narita