Patents by Inventor Jun Ohira

Jun Ohira 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).

  • Patent number: 10338486
    Abstract: An average value of a hydrogen content ratio of a surface layer made of hydrogenated amorphous carbon is set to be 0.40 or less and a maximum value of an sp2 bonding ratio in an outermost surface region of the surface layer made of the hydrogenated amorphous carbon is set to be 0.50 or less.
    Type: Grant
    Filed: September 4, 2018
    Date of Patent: July 2, 2019
    Assignee: CANON KABUSHIKI KAISHA
    Inventors: Yukihiro Abe, Jun Ohira, Kazunari Ooyama, Takanori Ueno, Hironori Owaki, Yasuo Kojima
  • Publication number: 20190072865
    Abstract: The present invention provides an electrophotographic photosensitive member which has a substrate, a photoconductive layer and a surface layer formed from hydrogenated amorphous silicon carbide in this order. The average value of the carbon content (C/(C+Si)) of the surface layer formed from the hydrogenated amorphous silicon carbide is set at 0.90 or more and less than 1.00, and the average value of the hydrogen content (H/(H+C+Si)) is set at 0.40 or less; and when the average value of the ratios of the sum of a Si—O bond and an O—Si—O bond in the outermost surface region that constitutes a range within a depth of 5 nm or less from the outermost surface of the surface layer is represented by a, and an average value of the silicon content (Si/(C+Si)) is represented by b, 0.015?a*b?0.090 holds.
    Type: Application
    Filed: August 28, 2018
    Publication date: March 7, 2019
    Inventors: Jun Ohira, Hironori Owaki, Yukihiro Abe, Yasuo Kojima, Kazunari Ooyama, Takanori Ueno
  • Publication number: 20190072866
    Abstract: An average value of a hydrogen content ratio of a surface layer made of hydrogenated amorphous carbon is set to be 0.40 or less and a maximum value of an sp2 bonding ratio in an outermost surface region of the surface layer made of the hydrogenated amorphous carbon is set to be 0.50 or less.
    Type: Application
    Filed: September 4, 2018
    Publication date: March 7, 2019
    Inventors: Yukihiro Abe, Jun Ohira, Kazunari Ooyama, Takanori Ueno, Hironori Owaki, Yasuo Kojima
  • Publication number: 20140349226
    Abstract: Provided is an electrophotographic photosensitive member that improves the sensitivity characteristic and high-humidity deletion resistance, and achieves compatibility between a high image-resolving power and the suppression of an image memory. The electrophotographic photosensitive member comprises an electrophotographic photosensitive member, including: a photoconductive layer; and a surface layer comprising hydrogenated amorphous silicon carbide on the photoconductive layer, in which: a ratio (C/(Si+C)) of a number of carbon atoms (C) to a sum of a number of silicon atoms (Si) and the number of the carbon atoms (C) in the surface layer is 0.50 or more and 0.65 or less; a sum of an atom density of the silicon atoms and an atom density of the carbon atoms in the surface layer is 6.60×1022 atoms/cm3 or more; and a defect density of the surface layer determined by electron spin resonance measurement is 9.0×1018 spins/cm3 or more and 2.2×1019 spins/cm3 or less.
    Type: Application
    Filed: May 27, 2014
    Publication date: November 27, 2014
    Applicant: CANON KABUSHIKI KAISHA
    Inventors: Yukihiro Abe, Takanori Ueno, Hironori Owaki, Tomohito Ozawa, Jun Ohira, Masaki Mizutani
  • 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: 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: 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: 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: 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: 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: 20060188799
    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: Application
    Filed: April 19, 2006
    Publication date: August 24, 2006
    Applicant: CANON KABUSHIKI KAISHA
    Inventors: Makoto Aoki, Satoshi Kojima, Hironori Owaki, Kazuo Hosoi, Jun Ohira
  • 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