Patents by Inventor Haruhi Oh-Oka

Haruhi Oh-Oka 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: 7029815
    Abstract: A liquid developer, a method of manufacturing the same and a method and apparatus for forming an image, which can attain high transfer efficiency and appropriate tolerance to repetitive image formation. The liquid developer includes toner particles dispersed in an electrically non-conductive liquid solvent. Each toner particle has a resin particle, which is non-soluble in the liquid developer, and pigment particles formed on the surface of the resin particle, whereby the pigment particles suppress contact between the resin particles. Preferably the resin particles have a glass transition temperature of not less than room temperature. One example of manufacturing the liquid developer includes a step of milling pigment particles in a resin particles dispersion liquid at a process temperature higher than the glass transition temperature of the resin particles, whereby the pigments are formed on the surface of the resin particles.
    Type: Grant
    Filed: September 24, 2004
    Date of Patent: April 18, 2006
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Yasushi Shinjo, Atsuko Iida, Haruhi Oh-Oka
  • Patent number: 6989222
    Abstract: A liquid developer, a method of manufacturing the same and a method and apparatus for forming an image, which can attain high transfer efficiency and appropriate tolerance to repetitive image formation. The liquid developer includes toner particles dispersed in an electrically non-conductive liquid solvent. Each toner particle has a resin particle, which is non-soluble in the liquid developer, and pigment particles formed on the surface of the resin particle, whereby the pigment particles suppress contact between the resin particles. Preferably the resin particles have a glass transition temperature of not less than room temperature. One example of manufacturing the liquid developer includes a step of milling pigment particles in a resin particles dispersion liquid at a process temperature higher than the glass transition temperature of the resin particles, whereby the pigments are formed on the surface of the resin particles.
    Type: Grant
    Filed: November 28, 2003
    Date of Patent: January 24, 2006
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Yasushi Shinjo, Atsuko Iida, Haruhi Oh-Oka
  • Publication number: 20050064316
    Abstract: A liquid developer, a method of manufacturing the same and a method and apparatus for forming an image, which can attain high transfer efficiency and appropriate tolerance to repetitive image formation. The liquid developer includes toner particles dispersed in an electrically non-conductive liquid solvent. Each toner particle has a resin particle, which is non-soluble in the liquid developer, and pigment particles formed on the surface of the resin particle, whereby the pigment particles suppress contact between the resin particles. Preferably the resin particles have a glass transition temperature of not less than room temperature. One example of manufacturing the liquid developer includes a step of milling pigment particles in a resin particles dispersion liquid at a process temperature higher than the glass transition temperature of the resin particles, whereby the pigments are formed on the surface of the resin particles.
    Type: Application
    Filed: September 24, 2004
    Publication date: March 24, 2005
    Applicant: KABUSHIKI KAISHA TOSHIBA
    Inventors: Yasushi Shinjo, Atsuko Iida, Haruhi Oh-Oka
  • Patent number: 6833229
    Abstract: A liquid developer, a method of manufacturing the same and a method and apparatus for forming an image, which can attain high transfer efficiency and appropriate tolerance to repetitive image formation. The liquid developer includes toner particles dispersed in an electrically non-conductive liquid solvent. Each toner particle has a resin particle, which is non-soluble in the liquid developer, and pigment particles formed on the surface of the resin particle, whereby the pigment particles suppress contact between the resin particles. Preferably the resin particles have a glass transition temperature of not less than room temperature. One example of manufacturing the liquid developer includes a step of milling pigment particles in a resin particles dispersion liquid at a process temperature higher than the glass transition temperature of the resin particles, whereby the pigments are formed on the surface of the resin particles.
    Type: Grant
    Filed: November 28, 2003
    Date of Patent: December 21, 2004
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Yasushi Shinjo, Atsuko Iida, Haruhi Oh-Oka
  • Publication number: 20040110080
    Abstract: A liquid developer, a method of manufacturing the same and a method and apparatus for forming an image, which can attain high transfer efficiency and appropriate tolerance to repetitive image formation. The liquid developer includes toner particles dispersed in an electrically non-conductive liquid solvent. Each toner particle has a resin particle, which is non-soluble in the liquid developer, and pigment particles formed on the surface of the resin particle, whereby the pigment particles suppress contact between the resin particles. Preferably the resin particles have a glass transition temperature of not less than room temperature. One example of manufacturing the liquid developer includes a step of milling pigment particles in a resin particles dispersion liquid at a process temperature higher than the glass transition temperature of the resin particles, whereby the pigments are formed on the surface of the resin particles.
    Type: Application
    Filed: November 28, 2003
    Publication date: June 10, 2004
    Applicant: KABUSHIKI KAISHA TOSHIBA
    Inventors: Yasushi Shinjo, Atsuko Iida, Haruhi Oh-Oka
  • Publication number: 20040106059
    Abstract: A liquid developer, a method of manufacturing the same and a method and apparatus for forming an image, which can attain high transfer efficiency and appropriate tolerance to repetitive image formation. The liquid developer includes toner particles dispersed in an electrically non-conductive liquid solvent. Each toner particle has a resin particle, which is non-soluble in the liquid developer, and pigment particles formed on the surface of the resin particle, whereby the pigment particles suppress contact between the resin particles. Preferably the resin particles have a glass transition temperature of not less than room temperature. One example of manufacturing the liquid developer includes a step of milling pigment particles in a resin particles dispersion liquid at a process temperature higher than the glass transition temperature of the resin particles, whereby the pigments are formed on the surface of the resin particles.
    Type: Application
    Filed: November 28, 2003
    Publication date: June 3, 2004
    Applicant: KABUSHIKI KAISHA TOSHIBA
    Inventors: Yasushi Shinjo, Atsuko Iida, Haruhi Oh-Oka
  • Patent number: 6725006
    Abstract: Image forming apparatus which form an image on a substrate and uses a liquid developer containing toner particles and a solvent. One embodiment includes a latent image retaining body, a first developing surface facing the latent image retaining body at a first development station, a latent image forming unit, and a second developing surface facing the latent image retaining body at a second development station. The latent image retaining body has a photosensitive layer which has a dielectric constant &egr;P [C2/Nm2] and an average thickness dp [m]. The photosensitive layer retains an image developed by the first developing surface and a latent image comprising image and non-image regions formed by the latent image forming unit. The second developing surface is supplied with a developing electrical potential having an electrical potential difference &Dgr;V from an electrical potential of non-image region of the latent image.
    Type: Grant
    Filed: June 13, 2003
    Date of Patent: April 20, 2004
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Masahiro Hosoya, Hitoshi Yagi, Yasushi Shinjo, Haruhi Oh-Oka
  • Patent number: 6689526
    Abstract: A liquid developer, a method of manufacturing the same and a method and apparatus for forming an image, which can attain high transfer efficiency and appropriate tolerance to repetitive image formation. The liquid developer includes toner particles dispersed in an electrically non-conductive liquid solvent. Each toner particle has a resin particle, which is non-soluble in the liquid developer, and pigment particles formed on the surface of the resin particle, whereby the pigment particles suppress contact between the resin particles. Preferably the resin particles have a glass transition temperature of not less than room temperature. One example of manufacturing the liquid developer includes a step of milling pigment particles in a resin particles dispersion liquid at a process temperature higher than the glass transition temperature of the resin particles, whereby the pigments are formed on the surface of the resin particles.
    Type: Grant
    Filed: December 21, 2001
    Date of Patent: February 10, 2004
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Yasushi Shinjo, Atsuko Iida, Haruhi Oh-Oka
  • Publication number: 20030206752
    Abstract: Image forming apparatus which form an image on a substrate and uses a liquid developer containing toner particles and a solvent. One embodiment includes a latent image retaining body, a first developing surface facing the latent image retaining body at a first development station, a latent image forming unit, and a second developing surface facing the latent image retaining body at a second development station. The latent image retaining body has a photosensitive layer which has a dielectric constant &egr;P [C2/Nm2] and an average thickness dp [m]. The photosensitive layer retains an image developed by the first developing surface and a latent image comprising image and non-image regions formed by the latent image forming unit. The second developing surface is supplied with a developing electrical potential having an electrical potential difference &Dgr;V from an electrical potential of non-image region of the latent image.
    Type: Application
    Filed: June 13, 2003
    Publication date: November 6, 2003
    Applicant: KABUSHIKI KAISHA TOSHIBA
    Inventors: Masahiro Hosoya, Hitoshi Yagi, Yasushi Shinjo, Haruhi Oh-Oka
  • Patent number: 6600890
    Abstract: Image forming apparatus which form an image on a substrate and uses a liquid developer containing toner particles and a solvent. One embodiment includes a latent image retaining body, a first developing surface facing the latent image retaining body at a first development station, a latent image forming unit, and a second developing surface facing the latent image retaining body at a second development station. The latent image retaining body has a photosensitive layer which has a dielectric constant ∈p [C2/Nm2] and an average thickness dp [m]. The photosensitive layer retains an image developed by the first developing surface and a latent image comprising image and non-image regions formed by the latent image forming unit. The second developing surface is supplied with a developing electrical potential having an electrical potential difference &Dgr;V from an electrical potential of non-image region of the latent image.
    Type: Grant
    Filed: October 12, 2001
    Date of Patent: July 29, 2003
    Inventors: Masahiro Hosoya, Hitoshi Yagi, Yasushi Shinjo, Haruhi Oh-Oka
  • Publication number: 20020191987
    Abstract: Image forming apparatus which form an image on a substrate and uses a liquid developer containing toner particles and a solvent. One embodiment includes a latent image retaining body, a first developing surface facing the latent image retaining body at a first development station, a latent image forming unit, and a second developing surface facing the latent image retaining body at a second development station. The latent image retaining body has a photosensitive layer which has a dielectric constant &egr;p [C2/Nm2] and an average thickness dp [m]. The photosensitive layer retains an image developed by the first developing surface and a latent image comprising image and non-image regions formed by the latent image forming unit. The second developing surface is supplied with a developing electrical potential having an electrical potential difference &Dgr;V from an electrical potential of non-image region of the latent image.
    Type: Application
    Filed: October 12, 2001
    Publication date: December 19, 2002
    Applicant: KABUSHI KAISHA TOSHIBA
    Inventors: Masahiro Hosoya, Hitoshi Yagi, Yasushi Shinjo, Haruhi Oh-Oka
  • Publication number: 20020086230
    Abstract: A liquid developer, a method of manufacturing the same and a method and apparatus for forming an image, which can attain high transfer efficiency and appropriate tolerance to repetitive image formation. The liquid developer includes toner particles dispersed in an electrically non-conductive liquid solvent. Each toner particle has a resin particle, which is non-soluble in the liquid developer, and pigment particles formed on the surface of the resin particle, whereby the pigment particles suppress contact between the resin particles. Preferably the resin particles have a glass transition temperature of not less than room temperature. One example of manufacturing the liquid developer includes a step of milling pigment particles in a resin particles dispersion liquid at a process temperature higher than the glass transition temperature of the resin particles, whereby the pigments are formed on the surface of the resin particles.
    Type: Application
    Filed: December 21, 2001
    Publication date: July 4, 2002
    Applicant: KABUSHHIKI KAISHA TOSHIBA
    Inventors: Yasushi Shinjo, Atsuko Iida, Haruhi Oh-Oka
  • Patent number: 6314253
    Abstract: Disclosed is image forming apparatus, including a photoconductor, a charger charging the surface of the photoconductor, a light source exposing the charged surface of the photoconductor to light to form a latent image, a developing unit supplying a liquid developing agent containing a liquid component and a solid component onto the photoconductor so as to convert the latent image into a visible image, a liquid component adjusting unit for adjusting the weight of the liquid component of the liquid developing agent on the surface of the photoconductor to meet the relationship of 0.1≦Ml/Ms≦4.0, where Ms represents the weight of the solid component of the developing agent supplied onto the photoconductor, and Ml represents the weight of the Liquid component of the developing agent, and a transfer unit transferring the visible image onto an image carrier.
    Type: Grant
    Filed: December 23, 1999
    Date of Patent: November 6, 2001
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Masahiro Hosoya, Hitoshi Yagi, Takeshi Watanabe, Yasushi Shinjo, Haruhi Oh-oka