Patents by Inventor Kazuto Hosoi

Kazuto Hosoi has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Publication number: 20130302734
    Abstract: The present invention provides a deposition film forming apparatus including a reaction container, an exhaust device and an exhaust gas flow path for causing a material gas to flow from the reaction container to the exhaust device, wherein the exhaust gas flow path includes a portion whose cross section expands with a step with respect to a direction in which the material gas flows and the deposition film forming apparatus further includes a cleaning gas flow device for causing the cleaning gas to directly flow into a region closer to the exhaust device side than the step of the exhaust gas flow path, a deposition film forming method using the deposition film forming apparatus and a method of manufacturing an electrophotographic photosensitive member using the deposition film forming method.
    Type: Application
    Filed: July 18, 2013
    Publication date: November 14, 2013
    Inventors: Kazuto HOSOI, Kazuyoshi AKIYAMA, Yukihiro ABE, Motoya YAMADA
  • Patent number: 8512923
    Abstract: An electrophotographic photosensitive member is disclosed which has a change layer consisting of five or more a-SiC intermediate layers, provided between an a-Si photoconductive layer and an a-SiC surface layer. Where two layers contiguous to each other in which C/(Si+C) is from 0.35 to 0.65 are selected from among the a-SiC intermediate layers included in the change layer, the rate of increase between the C/(Si+C) of an a-SiC intermediate layer on the photoconductive layer side and the C/(Si+C) of an a-SiC intermediate layer on the surface layer side (i.e., the rate of increase between layers) is 19% or less.
    Type: Grant
    Filed: April 15, 2010
    Date of Patent: August 20, 2013
    Assignee: Canon Kabushiki Kaisha
    Inventors: Kazuto Hosoi, Jun Ohira
  • Publication number: 20110299886
    Abstract: An electrophotographic photosensitive member is disclosed which has a change layer consisting of five or more a-SiC intermediate layers, provided between an a-Si photoconductive layer and an a-SiC surface layer. Where two layers contiguous to each other in which C/(Si+C) is from 0.35 to 0.65 are selected from among the a-SiC intermediate layers included in the change layer, the rate of increase between the C/(Si+C) of an a-SiC intermediate layer on the photoconductive layer side and the C/(Si+C) of an a-SiC intermediate layer on the surface layer side (i.e., the rate of increase between layers) is 19% or less.
    Type: Application
    Filed: April 15, 2010
    Publication date: December 8, 2011
    Applicant: CANON KABUSHIKI KAISHA
    Inventors: Kazuto Hosoi, Jun Ohira
  • Patent number: 7932005
    Abstract: A negatively-chargeable electrophotographic photosensitive member, has, between a cylindrical substrate and a photoconductive layer, a first lower-part layer formed of a non-single crystal material containing silicon atoms and a second lower-part layer formed of a non-single crystal material containing silicon atoms, and on its photoconductive layer has an upper-part layer formed of a non-single crystal material containing silicon atoms. The first lower-part layer is a layer containing a periodic-table Group 13 element, and the upper-part layer has a region capable of retaining electrification charges.
    Type: Grant
    Filed: January 7, 2010
    Date of Patent: April 26, 2011
    Assignee: Canon Kabushiki Kaisha
    Inventors: Jun Ohira, Makoto Aoki, Kazuto Hosoi
  • Publication number: 20100159122
    Abstract: The present invention provides a deposition film forming apparatus including a reaction container, an exhaust device and an exhaust gas flow path for causing a material gas to flow from the reaction container to the exhaust device, wherein the exhaust gas flow path includes a portion whose cross section expands with a step with respect to a direction in which the material gas flows and the deposition film forming apparatus further includes a cleaning gas flow device for causing the cleaning gas to directly flow into a region closer to the exhaust device side than the step of the exhaust gas flow path, a deposition film forming method using the deposition film forming apparatus and a method of manufacturing an electrophotographic photosensitive member using the deposition film forming method.
    Type: Application
    Filed: November 30, 2009
    Publication date: June 24, 2010
    Applicant: CANON KABUSHIKI KAISHA
    Inventors: Kazuto Hosoi, Kazuyoshi Akiyama, Yukihiro Abe, Motoya Yamada
  • Publication number: 20100112470
    Abstract: Provided are a negatively-chargeable electrophotographic photosensitive member, an image forming process and an electrophotographic apparatus. The electrophotographic photosensitive member has, between its cylindrical substrate and photoconductive layer, a first lower-part layer formed of a non-single crystal material containing silicon atoms and a second lower-part layer formed of a non-single crystal material containing silicon atoms, and has, on its photoconductive layer, an upper-part layer formed of a non-single crystal material containing silicon atoms. The first lower-part layer is a layer containing a periodic-table Group 13 element, and the upper-part layer has a region capable of retaining electrification charges.
    Type: Application
    Filed: January 7, 2010
    Publication date: May 6, 2010
    Applicant: CANON KABUSHIKI KAISHA
    Inventors: Jun Ohira, Makoto Aoki, Kazuto Hosoi
  • Patent number: 7550180
    Abstract: In a plasma treatment method of and apparatus for treating the surface of a treatment target substrate by utilizing glow discharge produced by supplying high-frequency power into an inside-evacuated reactor through a high-frequency power supply means, a plurality of impedance regulation means for regulating impedances on the side of the reactor and on the side of the high-frequency power supply means are provided correspondingly to the impedances of a plurality of reactors, and the high-frequency power is supplied into the reactors via the impedance regulation means corresponding to the reactors. Plasma treatment can be made in a good efficiency and a low cost on a plurality of reactors having different impedances.
    Type: Grant
    Filed: March 26, 2008
    Date of Patent: June 23, 2009
    Assignee: Canon Kabushiki Kaisha
    Inventors: Toshiyasu Shirasuna, Tatsuyuki Aoike, Kazuyoshi Akiyama, Hitoshi Murayama, Takashi Otsuka, Daisuke Tazawa, Kazuto Hosoi, Yukihiro Abe
  • Publication number: 20080271676
    Abstract: In a plasma treatment method of and apparatus for treating the surface of a treatment target substrate by utilizing glow discharge produced by supplying high-frequency power into an inside-evacuated reactor through a high-frequency power supply means, a plurality of impedance regulation means for regulating impedances on the side of the reactor and on the side of the high-frequency power supply means are provided correspondingly to the impedances of a plurality of reactors, and the high-frequency power is supplied into the reactors via the impedance regulation means corresponding to the reactors. Plasma treatment can be made in a good efficiency and a low cost on a plurality of reactors having different impedances.
    Type: Application
    Filed: March 26, 2008
    Publication date: November 6, 2008
    Applicant: Canon Kabushiki Kaisha
    Inventors: Toshiyasu Shirasuna, Tatsuyuki Aoike, Kazuyoshi Akiyama, Hitoshi Murayama, Takashi Otsuka, Daisuke Tazawa, Kazuto Hosoi, Yukihiro Abe
  • Patent number: 7255969
    Abstract: An electrophotographic photosensitive member is provided minimizing the absorption of image exposure having a short wavelength in a surface layer and keeping good electrophotographic properties including resolving power. The electrophotographic photosensitive member includes a conductive substrate, and a photoconductive layer and a surface region layer sequentially superimposed on the conductive substrate. The surface region layer is composed of a non-single-crystal silicon nitride film containing an Group element in the periodic table and a carbon atom and using at least a silicon atom and a nitrogen atom as base materials. In the surface region layer, the Group 13 element content with respect to the total amount of constituent atoms has distribution having at least two local maximum values in the thickness direction, and an the average concentration of nitrogen atoms is 30 atm % to 70 atm %.
    Type: Grant
    Filed: April 4, 2006
    Date of Patent: August 14, 2007
    Assignee: Canon Kabushiki Kaisha
    Inventors: Satoshi Kojima, Makoto Aoki, Jun Ohira, Hironori Owaki, Kazuto Hosoi, Motoya Yamada
  • Patent number: 7229730
    Abstract: The invention provides a process for producing a negative-charging electrophotographic photosensitive member which can improve the adherence between a first layer and a second layer without lowering the effect of lessening image defects and realize a reduction in overall costs, a negative-charging electrophotographic photosensitive member produced by the process, and an electrophotographic apparatus. In the process for producing a negative-charging electrophotographic photosensitive member, a first layer is deposited on a substarte, at least the vertexes of protuberances are removed, the substrate with the first layer deposited theron is placed in a film forming furnace, the first layer surface is plasma-treated with a gas containing at least a Group 13 element in the periodic table and a dilution gas composed of at least one selected from hydrogen, argon and helium, and a layer formed of a non-single-crystal material is deposited as the second layer on the first layer.
    Type: Grant
    Filed: January 27, 2006
    Date of Patent: June 12, 2007
    Assignee: Canon Kabushiki Kaisha
    Inventors: Jun Ohira, Satoshi Kojima, Makoto Aoki, Kazuto Hosoi
  • Patent number: 7229731
    Abstract: To provide a high-image-quality electrophotographic photosensitive member having a high sensitivity for a wavelength close to 380 to 500 nm, remarkable image resolution property in which absorption of the wavelength is hardly recognized, working-environment characteristic and high safety and superior in abrasion resistance and fabrication easiness and reducing optical memories and an electrophotographic apparatus using the high-image-quality electrophotographic photosensitive member. In the case of an electrophotographic photosensitive member having a substrate, photoconductive layer formed on the substrate and surface layer formed on the photoconductive layer and using silicon and nitrogen atoms as base material and containing an amorphous material containing at least oxygen atoms, the surface layer contains nitrogen atoms as an average concentration shown by the following expression (1) and contains oxygen atoms by the maximum value Omax of the number of oxygen atoms in the thickness direction: 0.
    Type: Grant
    Filed: April 19, 2006
    Date of Patent: June 12, 2007
    Assignee: Canon Kabushiki Kaisha
    Inventors: Makoto Aoki, Satoshi Kojima, Hironori Owaki, Kazuto Hosoi, Jun Ohira
  • Patent number: 7211357
    Abstract: Provided is an electrophotographic photosensitive member having a photoconductive layer on an electrically conductive substrate, the photoconductive layer being formed from a non-single-crystal material constituted by at least silicon atoms as a base material, and a non-single-crystal layer region constituted by silicon atoms and carbon atoms as base materials, the non-single-crystal layer region being laminated on the photoconductive layer, in which the content distribution of the oxygen atoms to a total amount of component atoms in a thickness direction within the non-single-crystal layer region has a peak.
    Type: Grant
    Filed: July 29, 2004
    Date of Patent: May 1, 2007
    Assignee: Canon Kabushiki Kaisha
    Inventors: Kazuto Hosoi, Toshiyuki Ehara, Hideaki Matsuoka, Satoshi Kojima
  • Patent number: 7157197
    Abstract: An electrophotographic photosensitive member is provided which can keep at a minimum the absorption of image exposure light of 380 to 500 nm in wavelength in its surface layer and concurrently can satisfactorily keep electrophotographic properties including resolving power. The electrophotographic photosensitive member has a substrate, and a photoconductive layer and a surface layer in this order provided on the substrate. The surface layer includes an amorphous material composed chiefly of silicon atoms and nitrogen atoms and containing at least oxygen atoms and carbon atoms, and the ratios of the numbers of the respective oxygen atoms, carbon atoms and nitrogen atoms to the total number of oxygen atoms, carbon atoms and nitrogen atoms contained in the amorphous material are each within a specific range.
    Type: Grant
    Filed: March 17, 2006
    Date of Patent: January 2, 2007
    Assignee: Canon Kabushiki Kaisha
    Inventors: Makoto Aoki, Satoshi Kojima, Motoya Yamada, Kazuto Hosoi, Jun Ohira, Hironori Owaki
  • Publication number: 20060194131
    Abstract: An electrophotographic photosensitive member is provided minimizing the absorption of image exposure having a short wavelength in a surface layer and keeping good electrophotographic properties including resolving power. The electrophotographic photosensitive member includes a conductive substrate, and a photoconductive layer and a surface region layer sequentially superimposed on the conductive substrate. The surface region layer is composed of a non-single-crystal silicon nitride film containing an Group element in the periodic table and a carbon atom and using at least a silicon atom and a nitrogen atom as base materials. In the surface region layer, the Group 13 element content with respect to the total amount of constituent atoms has distribution having at least two local maximum values in the thickness direction, and an the average concentration of nitrogen atoms is 30 atm % to 70 atm %.
    Type: Application
    Filed: April 4, 2006
    Publication date: August 31, 2006
    Applicant: CANON KABUSHIKI KAISHA
    Inventors: Satoshi Kojima, Makoto Aoki, Jun Ohira, Hironori Owaki, Kazuto Hosoi, Motoya Yamada
  • Publication number: 20060194132
    Abstract: An electrophotographic photosensitive member is provided in which electrophotographic properties including resolving power have been improved with minimized absorption of image exposure light at a short wavelength in a surface layer. The electrophotographic photosensitive member includes a photoconductive layer composed of a non-single-crystal silicon film and a surface region layer composed of a non-single-crystal silicon nitride film containing silicon atoms and nitrogen atoms, superimposed on a conductive substrate. The surface region layer has a gradient-composition layer in which the composition ratio between silicon atoms and nitrogen atoms is changed and a surface layer in which the composition ratio between them is constant. The gradient-composition layer and surface region layer contain a Group 13 element, and the content distribution of the element in the thickness direction of each layer has at least one local maximum value.
    Type: Application
    Filed: April 14, 2006
    Publication date: August 31, 2006
    Applicant: CANON KABUSHIKI KAISHA
    Inventors: Kazuto Hosoi, Satoshi Kojima, Jun Ohira, Makoto Aoki, Motoya Yamada, Hironori Owaki
  • Publication number: 20060160004
    Abstract: An electrophotographic photosensitive member is provided which can keep at a minimum the absorption of image exposure light of 380 to 500 nm in wavelength in its surface layer and concurrently can satisfactorily keep electrophotographic properties including resolving power. The electrophotographic photosensitive member has a substrate, and a photoconductive layer and a surface layer in this order provided on the substrate. The surface layer includes an amorphous material composed chiefly of silicon atoms and nitrogen atoms and containing at least oxygen atoms and carbon atoms, and the ratios of the numbers of the respective oxygen atoms, carbon atoms and nitrogen atoms to the total number of oxygen atoms, carbon atoms and nitrogen atoms contained in the amorphous material are each within a specific range.
    Type: Application
    Filed: March 17, 2006
    Publication date: July 20, 2006
    Applicant: CANON KABUSHIKI KAISHA
    Inventors: Makoto Aoki, Satoshi Kojima, Motoya Yamada, Kazuto Hosoi, Jun Ohira, Hironori Owaki
  • Publication number: 20060127783
    Abstract: The invention provides a process for producing a negative-charging electrophotographic photosensitive member which can improve the adherence between a first layer and a second layer without lowering the effect of lessening image defects and realize a reduction in overall costs, a negative-charging electrophotographic photosensitive member produced by the process, and an electrophotographic apparatus. In the process for producing a negative-charging electrophotographic photosensitive member, a first layer is deposited on a substarte, at least the vertexes of protuberances are removed, the substrate with the first layer deposited theron is placed in a film forming furnace, the first layer surface is plasma-treated with a gas containing at least a Group 13 element in the periodic table and a dilution gas composed of at least one selected from hydrogen, argon and helium, and a layer formed of a non-single-crystal material is deposited as the second layer on the first layer.
    Type: Application
    Filed: January 27, 2006
    Publication date: June 15, 2006
    Applicant: CANON KABUSHIKI KAISHA
    Inventors: Jun Ohira, Satoshi Kojima, Makoto Aoki, Kazuto Hosoi
  • Patent number: 7033717
    Abstract: An electrophotographic photosensitive member production process is provided having the steps of placing a cylindrical substrate having a conductive surface in a first film-forming chamber, and decomposing a source gas with high-frequency power to deposit on the cylindrical substrate a first layer formed of a non-single-crystal material, taking out of the first film-forming chamber the cylindrical substrate with the first layer deposited thereon, and placing the cylindrical substrate with the first layer deposited thereon in a second film-forming chamber, and decomposing a source gas with a high-frequency power to deposit on the first layer a second layer having an upper-part blocking layer formed of a non-single-crystal material. Even where abnormal growth portions called spherical protuberances are present on the photosensitive member surface, they can be made not to appear on images, and image defects can vastly be remedied.
    Type: Grant
    Filed: July 31, 2003
    Date of Patent: April 25, 2006
    Assignee: Canon Kabushiki Kaisha
    Inventors: Satoshi Kojima, Toshiyuki Ehara, Hideaki Matsuoka, Junichiro Hashizume, Ryuji Okamura, Koji Hitsuishi, Hironori Ohwaki, Kazuto Hosoi
  • Patent number: 7033721
    Abstract: The invention provides a method for producing an electrophotographic photosensitive member such that even if abnormal grown portions called spherical protrusions 203 exist on the surface of the photosensitive member, they do not appear on images, thus making it possible to considerably alleviate image defects.
    Type: Grant
    Filed: July 31, 2003
    Date of Patent: April 25, 2006
    Assignee: Canon Kabushiki Kaisha
    Inventors: Junichiro Hashizume, Toshiyuki Ehara, Hideaki Matsuoka, Ryuji Okamura, Koji Hitsuishi, Satoshi Kojima, Hironori Ohwaki, Kazuto Hosoi
  • 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