Patents by Inventor Hidemi Nukada

Hidemi Nukada 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: 7580655
    Abstract: A charging roller including: a support; an elastic layer provided on the outer peripheral surface of the support, and having a ground-finished outer peripheral surface; and a surface layer formed to cover the outer peripheral surface of the elastic layer and that has a thickness of about 2 ?m to about 10 ?m from the outer peripheral surface of the elastic layer, and a proportion of water absorbed in the total of the elastic layer and the surface layer, after storage for 48 hours in an environment having a temperature of 10° C. and a humidity of 15% RH, and after storage for 48 hours in an environment having a temperature of 28° C. and a humidity of 85% RH, being about 2% to about 8% by weight, being about 2% to about 8% by weight.
    Type: Grant
    Filed: May 16, 2007
    Date of Patent: August 25, 2009
    Assignee: Fuji Xerox Co., Ltd.
    Inventors: Hidemi Nukada, Shigeto Hashiba, Takahiro Suzuki, Koji Bando, Makoto Takemoto
  • Patent number: 7561828
    Abstract: The invention provides an image-forming apparatus, having an electrophotographic photoreceptor, a charging unit, a light-exposure unit, a development unit, a transfer unit, and a controller that controls the traveling speed of the peripheral surface of the electrophotographic photoreceptor and that thus makes a period from charging to development variable, wherein: the electrophotographic photoreceptor has an undercoat layer and a photosensitive layer; and the undercoat layer contains metal oxide fine particles with an acceptor compound added thereto; and an image is formed by charging, light exposure, development and transfer while causing the peripheral surface of the electrophotographic photoreceptor to travel in a predetermined direction; and a process cartridge that is detachable from the image forming apparatus.
    Type: Grant
    Filed: March 17, 2005
    Date of Patent: July 14, 2009
    Assignees: Fuji Xerox Co., Ltd., Xerox Corporation
    Inventors: Hidemi Nukada, Hirofumi Nakamura, Taketoshi Hoshizaki, Yu Qi, Ah-Mee Hor, Nan-Xing Hu
  • Publication number: 20090010664
    Abstract: The invention provides an image forming apparatus having: an image holding member; an image holding member; a charging unit; a latent image-forming unit; a development unit; a measuring unit; and a control unit. The image holding member has a substrate having a surface having regular reflectance in a range of about 30% to about 95% with respect to light having a first wavelength and a subbing layer having a light transmittance of about 50% or greater per unit thickness of the layer with respect to light having the first wavelength and a photosensitive layer having absorption with respect to light having a second wavelength that is different from the first wavelength.
    Type: Application
    Filed: March 20, 2008
    Publication date: January 8, 2009
    Applicant: FUJI XEROX CO., LTD.
    Inventors: Hidemi NUKADA, Takahiro SUZUKI, Isamu ISHIKO
  • Publication number: 20080187846
    Abstract: An image carrier includes a conductive base material and a photosensitive layer formed on the base material. The photosensitive layer has an outermost surface layer that contains particles having a number-averaged particle sphericality represented by Formula (1) of approximately 0.7 or less: sphericality=4?A/L2 (1), where ? represents the circular constant, A represents the projection area of the particle, and L represents the peripheral length of the projected particle image.
    Type: Application
    Filed: October 23, 2007
    Publication date: August 7, 2008
    Applicant: FUJI XEROX CO., LTD.
    Inventors: Hitoshi Takimoto, Kenta Ide, Toru Asahi, Hidemi Nukada, Takahiro Suzuki, Koji Bando
  • Patent number: 7381512
    Abstract: A hydroxygallium phthalocyanine pigment is characterized by having a maximum peak wavelength within a range of from 810 nm to 839 nm in optical absorption spectrum in a wavelength range of from 600 nm to 900 nm.
    Type: Grant
    Filed: August 30, 2004
    Date of Patent: June 3, 2008
    Assignee: Fuji Xerox Co., Ltd.
    Inventors: Kazuya Hongo, Kozo Ota, Masahiko Miyamoto, Yukiko Kamijo, Hidemi Nukada, Kenji Inoue
  • Publication number: 20080107451
    Abstract: A charging roller including: a support; an elastic layer provided on the outer peripheral surface of the support, and having a ground-finished outer peripheral surface; and a surface layer formed to cover the outer peripheral surface of the elastic layer and that has a thickness of about 2 ?m to about 10 ?m from the outer peripheral surface of the elastic layer, and a proportion of water absorbed in the total of the elastic layer and the surface layer, after storage for 48 hours in an environment having a temperature of 10° C. and a humidity of 15% RH, and after storage for 48 hours in an environment having a temperature of 28° C. and a humidity of 85% RH, being about 2% to about 8% by weight, being about 2% to about 8% by weight.
    Type: Application
    Filed: May 16, 2007
    Publication date: May 8, 2008
    Applicant: FUJI XEROX CO., LTD.
    Inventors: Hidemi Nukada, Shigeto Hashiba, Takahiro Suzuki, Koji Bando, Makoto Takemoto
  • Patent number: 7358984
    Abstract: An image forming apparatus includes: an electrophotographic photoreceptor having a conductive substrate and a photosensitive layer provided on the conductive substrate; a charging unit for charging the electrophotographic photoreceptor; an exposure unit for exposing the charged electrophotographic photoreceptor to light thereby forming an electrostatic latent image; a developing unit for developing the electrostatic latent image with toner thereby forming a toner image; and a transfer unit for transferring the toner image from the electrophotographic photoreceptor to a transferred image-receiving medium. The exposure unit is a multi beam exposure unit which has a surface emitting laser array and which carries out the electrostatic latent image formation by scanning the electrophotographic photoreceptor with eight or more light beams where electrophotographic photoreceptor gives a quantum efficiency of 0.
    Type: Grant
    Filed: October 14, 2003
    Date of Patent: April 15, 2008
    Assignee: Fuji Xerox Co., Ltd.
    Inventors: Taketoshi Hoshizaki, Hidemi Nukada, Takahiro Suzuki
  • Publication number: 20070065741
    Abstract: An electrophotographic photoreceptor comprises: an electroconductive support; and a photosensitive layer on the electroconductive support, wherein the photosensitive layer having a dynamic hardness of from 20×109 to 150×109 N/m2 and an elastic deformation ratio of from 15 to 80%.
    Type: Application
    Filed: February 17, 2006
    Publication date: March 22, 2007
    Applicant: FUJI XEROX CO., LTD.
    Inventors: Kaori Iemura, Katsumi Nukada, Hidemi Nukada, Kazuyuki Nakamura
  • Patent number: 7153574
    Abstract: A composition includes a metal oxide particle, which can optionally be surface treated by a silane coupling agent, and an electron acceptor surface grafted to the metal oxide particle.
    Type: Grant
    Filed: July 16, 2004
    Date of Patent: December 26, 2006
    Assignees: Xerox Corporation, Fuji Xerox Co., Ltd.
    Inventors: Yu Qi, Nan-Xing Hu, Ah-Mee Hor, Hidemi Nukada, Hirofumi Nakamura
  • Publication number: 20060014091
    Abstract: An electrophotographic photoreceptor comprising: an electrophotographic photoreceptor having at least an undercoat layer and a photosensitive layer formed on a conductive substrate, wherein the undercoat layer contains metal oxide fine particles and an electron acceptor compound having a group reactive with the metal oxide fine particles. A process cartridge and an electrophotographic apparatus using the electrophotographic photoreceptor are also provided.
    Type: Application
    Filed: March 17, 2005
    Publication date: January 19, 2006
    Applicants: Fuji Xerox Co., Ltd., Xerox Corporation
    Inventors: Hidemi Nukada, Hirofumi Nakamura, Yu Ql, Nan-Xing Hu, Ah-Mee Hor, Koji Bando
  • Publication number: 20060013616
    Abstract: An image forming apparatus comprising an electrophotographic photoreceptor, a charging unit, an exposure unit, a development unit, and a transfer unit, wherein the image forming apparatus conducts charging, exposure, development, and transfer while moving a circumferential surface of the electrophotographic photoreceptor in a predetermined direction, the image forming apparatus further comprises a controlling unit which controls a moving velocity of the circumferential surface of the electrophotographic photoreceptor so that a time required for processes from charging to development is changeable, the electrophotographic photoreceptor includes an undercoat layer and a photosensitive layer, and the undercoat layer includes a metal oxide particle and an acceptor compound having a group capable of reacting with the metal oxide particle.
    Type: Application
    Filed: March 18, 2005
    Publication date: January 19, 2006
    Inventors: Hidemi Nukada, Hirofumi Nakamura, Taketoshi Hoshizaki, Yu Qi, Nan-Xing Hu, Ah-Mee Hor
  • Publication number: 20060014092
    Abstract: An electrophotographic photoreceptor including at least an undercoat layer and a photosensitive layer on a conductive substrate, in which the undercoat layer includes metal oxide fine particles to which an electron acceptor compound is attached.
    Type: Application
    Filed: March 18, 2005
    Publication date: January 19, 2006
    Inventors: Hidemi Nukada, Hirofumi Nakamura, Taketoshi Hoshizaki, Yu Qi, Nan-Xing Hu, Ah-Mee Hor
  • Publication number: 20060014020
    Abstract: A composition includes a metal oxide particle, which can optionally be surface treated by a silane coupling agent, and an electron acceptor surface grafted to the metal oxide particle.
    Type: Application
    Filed: July 16, 2004
    Publication date: January 19, 2006
    Applicant: XEROX CORPORATION
    Inventors: Yu Qi, Nan-Xing Hu, Ah-Mee Hor, Hidemi Nukada, Hirofumi Nakamura
  • Publication number: 20060013615
    Abstract: The invention provides an image-forming apparatus, having an electrophotographic photoreceptor, a charging unit, a light-exposure unit, a development unit, a transfer unit, and a controller that controls the traveling speed of the peripheral surface of the electrophotographic photoreceptor and that thus makes a period from charging to development variable, wherein: the electrophotographic photoreceptor has an undercoat layer and a photosensitive layer; and the undercoat layer contains metal oxide fine particles with an acceptor compound added thereto; and an image is formed by charging, light exposure, development and transfer while causing the peripheral surface of the electrophotographic photoreceptor to travel in a predetermined direction; and a process cartridge that is detachable from the image forming apparatus.
    Type: Application
    Filed: March 17, 2005
    Publication date: January 19, 2006
    Applicants: FUJI XEROX CO., LTD., XEROS CORPORATION
    Inventors: Hidemi Nukada, Hirofumi Nakamura, Taketoshi Hoshizaki, Yu Qi, Ah-Mee Hor, Nan-Xing Hu
  • Publication number: 20050100806
    Abstract: A hydroxygallium phthalocyanine pigment is characterized by having a maximum peak wavelength within a range of from 810 nm to 839 nm in optical absorption spectrum in a wavelength range of from 600 nm to 900 nm.
    Type: Application
    Filed: August 30, 2004
    Publication date: May 12, 2005
    Applicant: FUJI XEROX CO., LTD.
    Inventors: Kazuya Hongo, Kozo Ota, Masahiko Miyamoto, Yukiko Kamijo, Hidemi Nukada, Kenji Inoue
  • Publication number: 20040183885
    Abstract: The invention provides an image forming apparatus comprising: an electrophotographic photoreceptor having a conductive substrate and a photosensitive layer provided on the conductive substrate; a charging unit for charging the electrophotographic photoreceptor; an exposure unit for exposing the charged electrophotographic photoreceptor to light thereby forming an electrostatic latent image; a developing unit for developing the electrostatic latent image with toner thereby forming a toner image; and a transfer unit for transferring the toner image from the electrophotographic photoreceptor to a transferred image-receiving medium, wherein said exposure unit is a multi beam exposure unit which has a surface emitting laser array and which carries out the electrostatic latent image formation by scanning the electrophotographic photoreceptor with eight or more light beams; and wherein said electrophotographic photoreceptor gives a quantum efficiency of 0.
    Type: Application
    Filed: October 14, 2003
    Publication date: September 23, 2004
    Applicant: FUJI XEROX CO., LTD.
    Inventors: Taketoshi Hoshizaki, Hidemi Nukada, Takahiro Suzuki
  • Patent number: 6773857
    Abstract: An electrophotographic photoreceptor having, between an electroconductive substrate and a photosensitive layer, an interlayer which contains fine metal oxide particles and a binder resin and which, when an electric field of 106 V/m is applied thereto at 28° C. and 85% RH, has a volume resistivity of from 108 to 1013 &OHgr;·cm and, when an electric field of 106 V/m is applied thereto at 15° C. and 15% RH, has a volume resistivity which is up to 500 times the volume resistivity thereof as measured when an electric field of 106 V/m is applied thereto at 28° C. and 85% RH.
    Type: Grant
    Filed: October 8, 2002
    Date of Patent: August 10, 2004
    Assignee: Fuji Xerox Co., Ltd.
    Inventors: Hirofumi Nakamura, Ichiro Takegawa, Hidemi Nukada, Masahiro Iwasaki, Michiko Aida, Yukiko Kamijo, Masahiko Miyamoto, Tetsuya Ezumi, Takashi Yamada, Koji Bando, Taketoshi Hoshizaki
  • Publication number: 20030118927
    Abstract: An electrophotographic photoreceptor having, between an electroconductive substrate and a photosensitive layer, an interlayer which contains fine metal oxide particles and a binder resin and which, when an electric field of 106 V/m is applied thereto at 28° C. and 85% RH, has a volume resistivity of from 108 to 1013 &OHgr;·cm and, when an electric field of 106 V/m is applied thereto at 15° C. and 15% RH, has a volume resistivity which is up to 500 times the volume resistivity thereof as measured when an electric field of 106 V/m is applied thereto at 28° C. and 85% RH.
    Type: Application
    Filed: October 8, 2002
    Publication date: June 26, 2003
    Applicant: FUJI XEROX CO., LTD.
    Inventors: Hirofumi Nakamura, Ichiro Takegawa, Hidemi Nukada, Masahiro Iwasaki, Michiko Aida, Yukiko Kamijo, Masahiko Miyamoto, Tetsuya Ezumi, Takashi Yamada, Koji Bando, Taketoshi Hoshizaki
  • Patent number: 6268096
    Abstract: A novel titanyl phthalocyanine crystal, a photoconductive material comprising the same, and an electrophotographic photoreceptor using the same are disclosed. The titanyl phthalocyanine crystal has a primary particle diameter ranging from 0.03 to 0.15 &mgr;m, shows a maximum X-ray diffraction peak at a Bragg angle (2&thgr;±0.2°) of 27.3°, has a ellipsoidal tabular form, and has a BET specific surface area of not less than 35 m2/g. The crystal has improved crystal form stability against solvents and holds its crystal form for an extended period of time in a dispersed and coated state. An electrophotographic photoreceptor using the crystal as a photoconductive material is excellent in sensitivity, stability, and durability.
    Type: Grant
    Filed: March 9, 1995
    Date of Patent: July 31, 2001
    Assignee: Fuji Xerox Co., LTD
    Inventors: Hidemi Nukada, Yasuo Sakaguchi, Taketoshi Hoshizaki, Fumio Ojima, Masayuki Nishikawa, Kohichi Yamamoto, Yumiko Komori
  • Patent number: 6232466
    Abstract: A process for preparing a stable titanyl phthalocyanine crystal showing at least one diffraction peak at a Bragg angle (2&thgr;±0.2) of 27.3° is disclosed, which comprises treating amorphous or quasi-amorphous titanyl phthalocyanine with a solvent selected from an alcohol solvent, an aromatic solvent, a mixed solvent of an alcohol solvent and an aromatic solvent, or a mixed solvent of an alcohol solvent and water. The resulting titanyl phthalocyanine exhibits high photosensitivity and excellent durability as a photoconductive material of an electrophotographic photoreceptor.
    Type: Grant
    Filed: March 19, 1991
    Date of Patent: May 15, 2001
    Assignee: Fuji Xerox Co., LTD
    Inventors: Katsumi Daimon, Akihiko Tokida, Katsumi Nukada, Hidemi Nukada, Yasuo Sakaguchi