Patents by Inventor Tomoko Koyama

Tomoko Koyama 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: 20120314274
    Abstract: An electrophoretic display includes: a first substrate and a second substrate facing each other; a base portion provided on the first substrate; a first concave portion provided such that a surface of the second substrate side of the base portion is recessed, and a second concave portion having a shallower depth than that of the first concave portion; a reflection plate provided on the surface except for the first concave portion and the second concave portion; a first electrode provided in a bottom surface of the first concave portion; a second electrode provided in a bottom surface of the second concave portion; a third electrode provided in the second substrate; and a dispersion liquid filled between the first substrate and the second substrate, in which an electrophoretic particle having a different color from that of the reflection plate is dispersed in a dispersing medium.
    Type: Application
    Filed: May 23, 2012
    Publication date: December 13, 2012
    Applicant: SEIKO EPSON CORPORATION
    Inventors: Harunobu KOMATSU, Tomoko KOYAMA
  • Patent number: 7940133
    Abstract: An atomic frequency acquisition apparatus includes: a cell enclosing atomic gas therein; a laser light source that oscillates a laser light that enters the cell and excites the atomic gas; and a photodetecting section that detects the laser light that has passed through the cell, wherein the cell has at least a laser light reflection section inside thereof.
    Type: Grant
    Filed: March 1, 2010
    Date of Patent: May 10, 2011
    Assignee: Seiko Epson Corporation
    Inventor: Tomoko Koyama
  • Publication number: 20100148879
    Abstract: An atomic frequency acquisition apparatus includes: a cell enclosing atomic gas therein; a laser light source that oscillates a laser light that enters the cell and excites the atomic gas; and a photodetecting section that detects the laser light that has passed through the cell, wherein the cell has at least a laser light reflection section inside thereof.
    Type: Application
    Filed: March 1, 2010
    Publication date: June 17, 2010
    Applicant: SEIKO EPSON CORPORATION
    Inventor: Tomoko KOYAMA
  • Patent number: 7701302
    Abstract: An atomic frequency acquisition apparatus includes: a cell enclosing atomic gas therein; a laser light source that oscillates a laser light that enters the cell and excites the atomic gas; and a photodetecting section that detects the laser light that has passed through the cell, wherein the cell has at least a laser light reflection section inside thereof.
    Type: Grant
    Filed: December 22, 2006
    Date of Patent: April 20, 2010
    Assignee: Seiko Epson Corporation
    Inventor: Tomoko Koyama
  • Patent number: 7582233
    Abstract: A method of manufacturing directional coupler includes forming a first waveguide over a substrate, forming a separate section on respective ends of the first waveguide, and forming a second waveguide stacked over the first waveguide, wherein the first waveguide and the second waveguide are patterned by ink-jet process. The first waveguide and the second waveguide may be formed so as to overlap each other. The method may further include forming a projecting portion on the substrate, wherein the first waveguide being formed on the projection portion.
    Type: Grant
    Filed: April 10, 2006
    Date of Patent: September 1, 2009
    Assignee: Seiko Epson Corporation
    Inventors: Tomoko Koyama, Takeo Kaneko, Taketomi Kamikawa, Norio Oguchi, Atsushi Harada
  • Patent number: 7566909
    Abstract: A surface-emitting type device includes a rectification section including a substrate and a first semiconductor layer formed above the substrate, an emission section including a second semiconductor layer of a first conductivity type formed above the rectification section, an active layer formed above the second semiconductor layer and a third semiconductor layer of a second conductivity type formed above the active layer, and a photodetection section including the substrate, a photoabsorption layer formed above the substrate and a contact layer formed above the photoabsorption layer, wherein the first semiconductor layer and the contact layer are formed by a common process, the rectification section and the emission section are electrically connected in parallel with each other, and the rectification section has a rectification action in a reverse direction with respect to the emission section.
    Type: Grant
    Filed: January 31, 2006
    Date of Patent: July 28, 2009
    Assignee: Seiko Epson Corporation
    Inventor: Tomoko Koyama
  • Patent number: 7453914
    Abstract: An optical element includes a surface-emitting type semiconductor laser, and a light-receiving element that detects a part of laser light emitted from the surface-emitting type semiconductor laser, wherein the light-receiving element is formed above the surface-emitting type semiconductor laser and includes a semiconductor layer having one or more layers, and at least one of the layers in the semiconductor layer has a plane configuration that has anisotropy.
    Type: Grant
    Filed: November 23, 2005
    Date of Patent: November 18, 2008
    Assignee: Seiko Epson Corporation
    Inventor: Tomoko Koyama
  • Patent number: 7446618
    Abstract: An atomic frequency acquisition apparatus includes: a cell enclosing atomic gas therein; a laser light source that oscillates laser light that enters the cell and excites the atomic gas; and a photodetecting section that detects the laser light that has passed the cell, wherein the laser light source and the photodetecting section are attached to a common surface facing an interior of the cell, and the cell has a first reflection section on which the laser light oscillated from the laser light source is incident at an incident angle of 45 degrees, and a second reflection section on which the laser light reflected by the first reflection section is incident at an incident angle of 45 degrees.
    Type: Grant
    Filed: December 20, 2006
    Date of Patent: November 4, 2008
    Assignee: Seiko Epson Corporation
    Inventor: Tomoko Koyama
  • Patent number: 7385225
    Abstract: A surface-emitting type device includes a rectification section including a substrate and a first semiconductor layer formed above the substrate, and an emission section including a second semiconductor layer of a first conductivity type formed above the rectification section, an active layer formed above the second semiconductor layer and a third semiconductor layer of a second conductivity type formed above the active layer, wherein the rectification section and the emission section are electrically connected in parallel with each other, and the rectification section has a rectification action in a reverse direction with respect to the emission section.
    Type: Grant
    Filed: December 9, 2005
    Date of Patent: June 10, 2008
    Assignee: Seiko Epson Corporation
    Inventor: Tomoko Koyama
  • Publication number: 20070146085
    Abstract: An atomic frequency acquisition apparatus includes: a cell enclosing atomic gas therein; a laser light source that oscillates a laser light that enters the cell and excites the atomic gas; and a photodetecting section that detects the laser light that has passed through the cell, wherein the cell has at least a laser light reflection section inside thereof.
    Type: Application
    Filed: December 22, 2006
    Publication date: June 28, 2007
    Applicant: SEIKO EPSON CORPORATION
    Inventor: Tomoko KOYAMA
  • Publication number: 20070139128
    Abstract: An atomic frequency acquisition apparatus includes: a cell enclosing atomic gas therein; a laser light source that oscillates laser light that enters the cell and excites the atomic gas; and a photodetecting section that detects the laser light that has passed the cell, wherein the laser light source and the photodetecting section are attached to a common surface facing an interior of the cell, and the cell has a first reflection section on which the laser light oscillated from the laser light source is incident at an incident angle of 45 degrees, and a second reflection section on which the laser light reflected by the first reflection section is incident at an incident angle of 45 degrees.
    Type: Application
    Filed: December 20, 2006
    Publication date: June 21, 2007
    Applicant: SEIKO EPSON CORPORATION
    Inventor: Tomoko Koyama
  • Patent number: 7198411
    Abstract: A method is provided to precisely mount an optical device and an optical fiber without manual alignment. A tapered through-hole is provided in a substrate to house the optical device whose optical transmission point substantially coincides with a geometrical center. The optical transmitter having a larger diameter than a diameter of the optical device is further inserted in the tapered through-hole housing the optical device.
    Type: Grant
    Filed: March 9, 2004
    Date of Patent: April 3, 2007
    Assignee: Seiko Epson Corporation
    Inventors: Eiichi Fujii, Tomoko Koyama
  • Patent number: 7197203
    Abstract: An optical element includes a substrate, a surface-emitting type semiconductor laser above the substrate and including a first mirror, an active layer and a second mirror formed in this order from the substrate side, a first optical detection section formed above the substrate, a second optical detection section above the substrate and having a second photoabsorption layer, and an isolation layer between the surface-emitting type semiconductor laser and at least one of the first optical detection section and the second optical detection section. The first optical detection section includes a first photoabsorption layer above the substrate and a photonic crystal section above or below the first photoabsorption layer. The photonic crystal section has a one or a two dimensional photonic crystal structure having a periodic refractive index distribution in a plane that intersects a direction of light incident upon the first optical detection section.
    Type: Grant
    Filed: November 29, 2005
    Date of Patent: March 27, 2007
    Assignee: Seiko Epson Corporation
    Inventor: Tomoko Koyama
  • Patent number: 7138764
    Abstract: A light-emitting device includes a light-emitting layer capable of generating light by electroluminescence, a pair of electrodes applies an electric field to the light-emitting layer, and a substrate having a depression in a surface, and the light-emitting layer is disposed within the depression of the substrate.
    Type: Grant
    Filed: October 11, 2002
    Date of Patent: November 21, 2006
    Assignee: Seiko Epson Corporation
    Inventors: Tomoko Koyama, Takeo Kaneko, Taketomi Kamikawa, Norio Oguchi, Atsushi Harada
  • Patent number: 7129469
    Abstract: A method is provided to provide a photodetector that can enhance the light receiving sensitivity with a relatively simple structure, and that can maintain a high speed responsiveness. A photodetector having a MSM (Metal-Semiconductor-Metal) structure, including a substrate, a multilayer film that is disposed over the substrate and includes a low refractive index layer and a high refractive index layer that are alternately laminated as a unit cycle. At least one of the low refractive index layer and the high refractive index layer is a photoabsorption layer composed of semiconductor, and a portion that is embedded in the multilayer film, the portion having at least one pair of opposing electrodes within the multilayer film.
    Type: Grant
    Filed: November 1, 2004
    Date of Patent: October 31, 2006
    Assignee: Seiko Epson Corporation
    Inventors: Masamitsu Mochizuki, Tomoko Koyama, Hajime Onishi
  • Publication number: 20060192088
    Abstract: A surface-emitting type device includes a rectification section including a substrate and a first semiconductor layer formed above the substrate, an emission section including a second semiconductor layer of a first conductivity type formed above the rectification section, an active layer formed above the second semiconductor layer and a third semiconductor layer of a second conductivity type formed above the active layer, and a photodetection section including the substrate, a photoabsorption layer formed above the substrate and a contact layer formed above the photoabsorption layer, wherein the first semiconductor layer and the contact layer are formed by a common process, the rectification section and the emission section are electrically connected in parallel with each other, and the rectification section has a rectification action in a reverse direction with respect to the emission section.
    Type: Application
    Filed: January 31, 2006
    Publication date: August 31, 2006
    Applicant: SEIKO EPSON CORPORATION
    Inventor: Tomoko Koyama
  • Publication number: 20060174657
    Abstract: A method of manufacturing directional coupler includes forming a first waveguide over a substrate, forming a separate section on respective ends of the first waveguide, and forming a second waveguide stacked over the first waveguide, wherein the first waveguide and the second waveguide are patterned by ink-jet process. The first waveguide and the second waveguide may be formed so as to overlap each other. The method may further include forming a projecting portion on the substrate, wherein the first waveguide being formed on the projection portion.
    Type: Application
    Filed: April 10, 2006
    Publication date: August 10, 2006
    Applicant: SEIKO EPSON CORPORATION
    Inventors: Tomoko Koyama, Takeo Kaneko, Taketomi Kamikawa, Norio Oguchi, Atsushi Harada
  • Patent number: RE43759
    Abstract: A multiple wavelength light emitting device is provided wherewith the resonance strength and directivity between colors can be easily adjusted for balance. This light emitting device comprises a light emission means 4 for emitting light containing wavelength components to be output, and a semi-reflecting layer group 2 wherein semi-reflecting layers 2R, 2G, and 2B that transmit some light having specific wavelengths emitted from the light emission means and reflect the remainder are stacked up in order in the direction of light advance in association with wavelengths of light to be output. Light emission regions AR, AG, and AB are determined in association with the wavelengths of light to be output.
    Type: Grant
    Filed: June 2, 2000
    Date of Patent: October 23, 2012
    Assignees: Seiko Epson Corporation, Cambridge Display Technology Ltd
    Inventors: Tatsuya Shimoda, Tomoko Koyama, Takeo Kaneko, Jeremy Henley Burroughes
  • Patent number: RE44164
    Abstract: A multiple wavelength light emitting device is provided wherewith the resonance strength and directivity between colors can be easily adjusted for balance. This light emitting device comprises a light emission means 4 for emitting light containing wavelength components to be output, and a semi-reflecting layer group 2 wherein semi-reflecting layers 2R, 2G, and 2B that transmit some light having specific wavelengths emitted from the light emission means and reflect the remainder are stacked up in order in the direction of light advance in association with wavelengths of light to be output. Light emission regions AR, AG, and AB are determined in association with the wavelengths of light to be output.
    Type: Grant
    Filed: June 2, 2000
    Date of Patent: April 23, 2013
    Assignees: Seiko Epson Corporation, Cambridge Display Technology Ltd
    Inventors: Tatsuya Shimoda, Tomoko Koyama, Takeo Kaneko, Jeremy Henley Burroughes
  • Patent number: RE45442
    Abstract: A multiple wavelength light emitting device is provided wherewith the resonance strength and directivity between colors can be easily adjusted for balance. This light emitting device comprises a light emission means 4 for emitting light containing wavelength components to be output, and a semi-reflecting layer group 2 wherein semi-reflecting layers 2R, 2G, and 2B that transmit some light having specific wavelengths emitted from the light emission means and reflect the remainder are stacked up in order in the direction of light advance in association with wavelengths of light to be output. Light emission regions AR, AG, and AB are determined in association with the wavelengths of light to be output.
    Type: Grant
    Filed: April 12, 2011
    Date of Patent: March 31, 2015
    Assignees: Seiko Epson Corporation, Cambridge Display Technology Limited
    Inventors: Tatsuya Shimoda, Tomoko Koyama, Takeo Kaneko, Jeremy Henley Burroughes