Patents by Inventor Taketoshi Hoshizaki

Taketoshi Hoshizaki 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: 10095138
    Abstract: An electrophotographic photoreceptor includes a conductive substrate and a photosensitive layer disposed on the conductive substrate, wherein when time that takes for a current value to reach the maximum after beginning of application of a square wave voltage to the electrophotographic photoreceptor is T1 and time that takes for the current value to reach the maximum after the beginning of the application of the square wave voltage and then decrease to one fifth of the maximum is T2, T2 is approximately from 3.2 to 11.0 times as large as T1.
    Type: Grant
    Filed: September 8, 2017
    Date of Patent: October 9, 2018
    Assignee: FUJI XEROX CO., LTD.
    Inventors: Kosuke Narita, Taketoshi Hoshizaki
  • Publication number: 20180210356
    Abstract: An electrophotographic photoreceptor includes a conductive substrate and a photosensitive layer disposed on the conductive substrate, wherein when time that takes for a current value to reach the maximum after beginning of application of a square wave voltage to the electrophotographic photoreceptor is T1 and time that takes for the current value to reach the maximum after the beginning of the application of the square wave voltage and then decrease to one fifth of the maximum is T2, T2 is approximately from 3.2 to 11.0 times as large as T1.
    Type: Application
    Filed: September 8, 2017
    Publication date: July 26, 2018
    Applicant: FUJI XEROX CO., LTD.
    Inventors: Kosuke NARITA, Taketoshi HOSHIZAKI
  • Patent number: 9939743
    Abstract: An electrophotographic photoreceptor includes a conductive substrate; an undercoat layer disposed on the conductive substrate and containing a binder resin, metal oxide particles, and an electron-accepting compound having an anthraquinone structure; and a photosensitive layer disposed on the undercoat layer, wherein the reflectance RL of the undercoat layer for light having a wavelength ranging approximately from 470 nm to 510 nm is approximately from 2% to 5%.
    Type: Grant
    Filed: March 8, 2017
    Date of Patent: April 10, 2018
    Assignee: FUJI XEROX CO., LTD.
    Inventor: Taketoshi Hoshizaki
  • Publication number: 20180067408
    Abstract: An electrophotographic photoreceptor includes a conductive substrate; an undercoat layer disposed on the conductive substrate and containing a binder resin, metal oxide particles, and an electron-accepting compound having an anthraquinone structure; and a photosensitive layer disposed on the undercoat layer, wherein the reflectance RL of the undercoat layer for light having a wavelength ranging approximately from 470 nm to 510 nm is approximately from 2% to 5%.
    Type: Application
    Filed: March 8, 2017
    Publication date: March 8, 2018
    Applicant: FUJI XEROX CO., LTD.
    Inventor: Taketoshi HOSHIZAKI
  • Patent number: 9823598
    Abstract: A conductive member includes a substrate, an elastic layer on the substrate, and a surface layer on the elastic layer. The surface layer contains a resin and insulating particles. The insulating particles account for 50% or more and 70% or less of an area of a cross-section of the surface layer taken in a thickness direction.
    Type: Grant
    Filed: August 4, 2016
    Date of Patent: November 21, 2017
    Assignee: FUJI XEROX CO., LTD.
    Inventors: Yukiko Kamijo, Taketoshi Hoshizaki
  • Publication number: 20170277060
    Abstract: A conductive member includes a substrate, an elastic layer on the substrate, and a surface layer on the elastic layer. The surface layer contains a resin and insulating particles. The insulating particles account for 50% or more and 70% or less of an area of a cross-section of the surface layer taken in a thickness direction.
    Type: Application
    Filed: August 4, 2016
    Publication date: September 28, 2017
    Applicant: FUJI XEROX CO., LTD.
    Inventors: Yukiko KAMIJO, Taketoshi HOSHIZAKI
  • Patent number: 9720343
    Abstract: A conductive member includes a substrate, an elastic layer formed on the substrate, and a surface layer formed on the elastic layer, wherein the surface layer has a sea-island structure that includes a sea portion at least containing a first resin and a conductive agent and island portions at least containing a second resin, the island portions have an average diameter of approximately at least 100 nm and not greater than 1/10 of the thickness of the surface layer, and the conductive agent contained in the sea portion is unevenly distributed in the vicinity of the interface of the sea portion with the island portions.
    Type: Grant
    Filed: March 4, 2016
    Date of Patent: August 1, 2017
    Assignee: FUJI XEROX CO., LTD.
    Inventors: Yukiko Kamijo, Taketoshi Hoshizaki, Hidemi Nukada
  • Publication number: 20170003616
    Abstract: A conductive member includes a substrate, an elastic layer formed on the substrate, and a surface layer formed on the elastic layer, wherein the surface layer has a sea-island structure that includes a sea portion at least containing a first resin and a conductive agent and island portions at least containing a second resin, the island portions have an average diameter of approximately at least 100 nm and not greater than 1/10 of the thickness of the surface layer, and the conductive agent contained in the sea portion is unevenly distributed in the vicinity of the interface of the sea portion with the island portions.
    Type: Application
    Filed: March 4, 2016
    Publication date: January 5, 2017
    Applicant: FUJI XEROX CO., LTD.
    Inventors: Yukiko KAMIJO, Taketoshi HOSHIZAKI, Hidemi NUKADA
  • Patent number: 9280079
    Abstract: A charging member includes a conductive base material and a conductive outermost layer provided on the conductive base material, wherein the conductive outermost layer has a ten-point average surface roughness Rz of 2 ?m to 20 ?m and contains a resin and particles in which particles having a particle diameter of 5.0 ?m or more and a circularity of 0.8 or less are 30% by number or less with respect to the total number of particles having a particle diameter of 5.0 ?m or more and particles having a particle diameter of less than 5.0 ?m and a circularity of 0.8 or less are from 20% by number to 80% by number with respect to the total number of particles having a particle diameter of less than 5.0 ?m.
    Type: Grant
    Filed: September 4, 2015
    Date of Patent: March 8, 2016
    Assignee: FUJI XEROX CO., LTD.
    Inventors: Takuro Hoshio, Taketoshi Hoshizaki, Hiroyuki Miura, Kosuke Narita, Jiro Korenaga, Yasuhiro Niida, Yoshiyuki Hayashi, Yasuhiko Kinuta
  • Patent number: 9046803
    Abstract: A charging roll includes a cylindrical base member that has a metal-containing surface, a conductive adhesive layer that includes a halogen atom-containing resin and has surface roughness Rz in a range of 0.5 ?m to 8 ?m on an outer peripheral surface side on the base member, and a conductive elastic layer that is disposed to be brought into contact with the outer peripheral surface of the conductive adhesive layer and includes a halogen atom-containing rubber.
    Type: Grant
    Filed: February 18, 2014
    Date of Patent: June 2, 2015
    Assignee: FUJI XEROX CO., LTD.
    Inventors: Takuro Hoshio, Taketoshi Hoshizaki, Shoichi Masuda, Eiichi Iida, Takahiko Hattori, Noboru Wada
  • Publication number: 20150050052
    Abstract: A charging roll includes a cylindrical base member that has a metal-containing surface, a conductive adhesive layer that includes a halogen atom-containing resin and has surface roughness Rz in a range of 0.5 ?m to 8 ?m on an outer peripheral surface side on the base member, and a conductive elastic layer that is disposed to be brought into contact with the outer peripheral surface of the conductive adhesive layer and includes a halogen atom-containing rubber.
    Type: Application
    Filed: February 18, 2014
    Publication date: February 19, 2015
    Applicant: FUJI XEROX CO., LTD.
    Inventors: Takuro HOSHIO, Taketoshi HOSHIZAKI, Shoichi MASUDA, Eiichi IIDA, Takahiko HATTORI, Noboru WADA
  • Patent number: 8467697
    Abstract: The present invention provides a cleaning member for an image forming apparatus, including: a shaft body; and an elastic material that is wound on the outer peripheral surface of the shaft body in a spiral shape, the elastic material satisfying the following expressions. (A1): 1<Tb/Ta<1.75. (A2): 0.5<Ta<4.0. In expressions (A1) and (A2), Ta represents a thickness of a center portion in the spiral width direction of the elastic material in millimeters, and Tb represents a thickness of both end portions in the spiral width direction of the elastic material in millimeters.
    Type: Grant
    Filed: October 7, 2010
    Date of Patent: June 18, 2013
    Assignee: Fuji Xerox Co., Ltd.
    Inventors: Takeshi Kawai, Masato Ono, Akihiro Nonaka, Taketoshi Hoshizaki
  • Patent number: 8090298
    Abstract: An electrostatic charging member includes a base material; and an outermost layer that contains a porous filler and a resin and has a gel fraction of at least about 50% and a surface roughness Rz in a range of about 2 ?m to about 20 ?m.
    Type: Grant
    Filed: April 16, 2009
    Date of Patent: January 3, 2012
    Assignee: Fuji Xerox Co., Ltd.
    Inventors: Takuro Hoshio, Noboru Wada, Makoto Takemoto, Nagahito Ichijo, Naoki Ohta, Kenji Inoue, Hiroyuki Miura, Keiko Ono, Taketoshi Hoshizaki, Minoru Rokutan
  • Publication number: 20110170901
    Abstract: The present invention provides a cleaning member for an image forming apparatus, including: a shaft body; and an elastic material that is wound on the outer peripheral surface nun of the shaft body in a spiral shape, the elastic material satisfying the following expressions. (A1): 1<Tb/Ta<1.75. (A2): 0.5<Ta<4.0. In expressions (A1) and (A2), Ta represents a thickness of a center portion in the spiral width direction of the elastic material in millimeters and Tb represents a thickness of both end portions in the spiral width direction of the elastic material in millimeters.
    Type: Application
    Filed: October 7, 2010
    Publication date: July 14, 2011
    Applicant: FUJI XEROX CO., LTD.
    Inventors: Takeshi KAWAI, Masato ONO, Akihiro NONAKA, Taketoshi HOSHIZAKI
  • Publication number: 20100104316
    Abstract: An electrostatic charging member includes a base material; and an outermost layer that contains a porous filler and a resin and has a gel fraction of at least about 50% and a surface roughness Rz in a range of about 2 ?m to about 20 ?m.
    Type: Application
    Filed: April 16, 2009
    Publication date: April 29, 2010
    Applicant: FUJI XEROX CO., LTD.
    Inventors: Takuro HOSHIO, Noboru WADA, Makoto TAKEMOTO, Nagahito ICHIJO, Naoki OHTA, Kenji INOUE, Hiroyuki MIURA, Keiko ONO, Taketoshi HOSHIZAKI, Minoru ROKUTAN
  • Patent number: 7702256
    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: Grant
    Filed: March 18, 2005
    Date of Patent: April 20, 2010
    Assignees: Fuji Xerox Co., Ltd., Xerox Corporation
    Inventors: Hidemi Nukada, Hirofumi Nakamura, Taketoshi Hoshizaki, Yu Qi, Nan-Xing Hu, Ah-Mee Hor
  • 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
  • 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: 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