Patents by Inventor Ryuta Koizumi

Ryuta Koizumi 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: 20210294192
    Abstract: A wavelength conversion element according to the present disclosure includes a substrate, a reflecting layer, a wavelength conversion layer which is disposed on the reflecting layer, and which is configured to convert light in a first wavelength band into light in a second wavelength band, a structure which is disposed on the wavelength conversion layer, and which is configured to scatter the light in the first wavelength band, and an optical layer which is disposed on the structure, and which is configured to reflect a part of the light in the first wavelength band, transmit another part of the light in the first wavelength band, and transmit the light in the second wavelength band, wherein the optical layer is different in reflectance with respect to the light in the first wavelength band in accordance with an incidence angle of the light in the first wavelength band entering the optical layer.
    Type: Application
    Filed: March 22, 2021
    Publication date: September 23, 2021
    Applicant: SEIKO EPSON CORPORATION
    Inventors: Koya SHIRATORI, Mizuha HIROKI, Ryuta KOIZUMI, Tetsuo SHIMIZU
  • Publication number: 20210297641
    Abstract: The wavelength conversion element according to the present disclosure includes a wavelength conversion layer which has a first surface and a second surface different from the first surface, and which includes a scattering element no higher than 5% in volume ratio, and which is configured to convert light in a first wavelength band into light in a second wavelength band different from the first wavelength band, and a plurality of protruding parts which is disposed so as to be opposed to the first surface, and which includes a first protruding part and a second protruding part adjacent to each other. A height of the plurality of protruding parts is no smaller than 1 ?m, and a distance between a vertex of the first protruding part and a vertex of the second protruding part in a direction along the first surface is no smaller than 3 ?m.
    Type: Application
    Filed: March 17, 2021
    Publication date: September 23, 2021
    Applicant: SEIKO EPSON CORPORATION
    Inventors: Shinichi Yotsuya, Tetsuo Shimizu, Ryuta Koizumi, Mizuha Hiroki
  • Patent number: 10845684
    Abstract: A projector includes a light source device, a plurality of light modulation devices each adapted to modulate a light beam emitted from the light source device, a light combining device adapted to combine the light beams respectively modulated by the light modulation devices, a projection optical device adapted to project the light beam combined by the light combining device, a housing in which the light modulation devices and the light combining device are disposed, the housing having a first cooling liquid encapsulated inside, a stirring device adapted to stir the first cooling liquid inside the housing, and a control device disposed outside the housing and connected to the housing, the control device adapted to control the light modulation devices. The housing has a connection section connecting the control device and a plurality of light modulation device side signal lines respectively extending from the light modulation devices to each other.
    Type: Grant
    Filed: September 26, 2018
    Date of Patent: November 24, 2020
    Assignee: SEIKO EPSON CORPORATION
    Inventors: Yoshiyuki Yanagisawa, Ryuta Koizumi
  • Patent number: 10542241
    Abstract: A polarization separation element that separates a light emitted from a first light emitting device into a light having first polarization in a first wavelength range and a light having second polarization in the first wavelength range, a wavelength conversion element converts the light into a light in a second wavelength range, a first light modulation device modulates the entering light according to image information, an optical element that separates the light in the second wavelength range into a light in a third wavelength range and a light in a fourth wavelength range, a second light modulation device that modulates the light according to the image information, a third light modulation device that modulates the light according to the image information, and a projection system that projects an image light are provided, wherein the wavelength conversion element has a first surface and a second surface different from the first surface.
    Type: Grant
    Filed: February 27, 2019
    Date of Patent: January 21, 2020
    Assignee: SEIKO EPSON CORPORATION
    Inventor: Ryuta Koizumi
  • Publication number: 20190268578
    Abstract: A polarization separation element that separates a light emitted from a first light emitting device into a light having first polarization in a first wavelength range and a light having second polarization in the first wavelength range, a wavelength conversion element converts the light into a light in a second wavelength range, a first light modulation device modulates the entering light according to image information, an optical element that separates the light in the second wavelength range into a light in a third wavelength range and a light in a fourth wavelength range, a second light modulation device that modulates the light according to the image information, a third light modulation device that modulates the light according to the image information, and a projection system that projects an image light are provided, wherein the wavelength conversion element has a first surface and a second surface different from the first surface.
    Type: Application
    Filed: February 27, 2019
    Publication date: August 29, 2019
    Applicant: SEIKO EPSON CORPORATION
    Inventor: Ryuta KOIZUMI
  • Patent number: 10379284
    Abstract: A light source device includes a first light source configured to emit excitation light having a first wavelength band, a wavelength conversion member having a plurality of surfaces and configured to convert the excitation light made incident from the first light source into converted light having a second wavelength band different from the first wavelength band, and a first light transmissive member provided between the first light source and the wavelength conversion member and configured to transmit the excitation light. The wavelength conversion member includes a first surface on which the excitation light from the first light source is made incident. The first light transmissive member includes, on a surface opposed to the first surface of the wavelength conversion member, a first reflection layer that transmits the excitation light and reflects the converted light. A gap is provided between the first surface and the first reflection layer.
    Type: Grant
    Filed: March 13, 2018
    Date of Patent: August 13, 2019
    Assignee: SEIKO EPSON CORPORATION
    Inventors: Ryuta Koizumi, Toshiaki Hashizume
  • Patent number: 10261402
    Abstract: A light source device includes a first light source configured to emit excitation light in a first wavelength band and a wavelength conversion member having a plurality of surfaces and configured to convert the excitation light made incident from the first light source into converted light in a second wavelength band different from the first wavelength band. The wavelength conversion member includes a first surface on which the excitation light is made incident, a second surface opposed to the first surface, and a third surface that emits the converted light. A first reflection layer that transmits the excitation light and reflects the converted light is provided on the first surface.
    Type: Grant
    Filed: March 13, 2018
    Date of Patent: April 16, 2019
    Assignee: SEIKO EPSON CORPORATION
    Inventors: Ryuta Koizumi, Toshiaki Hashizume
  • Publication number: 20190094669
    Abstract: A projector includes a light source device, a plurality of light modulation devices each adapted to modulate a light beam emitted from the light source device, a light combining device adapted to combine the light beams respectively modulated by the light modulation devices, a projection optical device adapted to project the light beam combined by the light combining device, a housing in which the light modulation devices and the light combining device are disposed, the housing having a first cooling liquid encapsulated inside, a stirring device adapted to stir the first cooling liquid inside the housing, and a control device disposed outside the housing and connected to the housing, the control device adapted to control the light modulation devices. The housing has a connection section connecting the control device and a plurality of light modulation device side signal lines respectively extending from the light modulation devices to each other.
    Type: Application
    Filed: September 26, 2018
    Publication date: March 28, 2019
    Applicant: SEIKO EPSON CORPORATION
    Inventors: Yoshiyuki YANAGISAWA, Ryuta KOIZUMI
  • Publication number: 20180284583
    Abstract: A light source device includes a first light source configured to emit excitation light in a first wavelength band and a wavelength conversion member having a plurality of surfaces and configured to convert the excitation light made incident from the first light source into converted light in a second wavelength band different from the first wavelength band. The wavelength conversion member includes a first surface on which the excitation light is made incident, a second surface opposed to the first surface, and a third surface that emits the converted light. A first reflection layer that transmits the excitation light and reflects the converted light is provided on the first surface.
    Type: Application
    Filed: March 13, 2018
    Publication date: October 4, 2018
    Applicant: SEIKO EPSON CORPORATION
    Inventors: Ryuta KOIZUMI, Toshiaki HASHIZUME
  • Publication number: 20180284340
    Abstract: A light source device includes a first light source configured to emit excitation light having a first wavelength band, a wavelength conversion member having a plurality of surfaces and configured to convert the excitation light made incident from the first light source into converted light having a second wavelength band different from the first wavelength band, and a first light transmissive member provided between the first light source and the wavelength conversion member and configured to transmit the excitation light. The wavelength conversion member includes a first surface on which the excitation light from the first light source is made incident. The first light transmissive member includes, on a surface opposed to the first surface of the wavelength conversion member, a first reflection layer that transmits the excitation light and reflects the converted light. A gap is provided between the first surface and the first reflection layer.
    Type: Application
    Filed: March 13, 2018
    Publication date: October 4, 2018
    Applicant: SEIKO EPSON CORPORATION
    Inventors: Ryuta KOIZUMI, Toshiaki HASHIZUME
  • Patent number: 8405700
    Abstract: An exposure head includes a light emitting element and a imaging optical system having a first region and a second region and contrived such that a slope of a long dimension of a spot diagram formed by light emitted from the light emitting element that passes through the first region is different from a slope of a long dimension of a spot diagram formed by light emitted from the light emitting element that passes through the second region.
    Type: Grant
    Filed: March 29, 2011
    Date of Patent: March 26, 2013
    Assignee: Seiko Epson Corporation
    Inventors: Ryuta Koizumi, Takeshi Sowa, Ken Ikuma
  • Patent number: 8355185
    Abstract: Disclosed is an exposure head including a light emitting element array including light emitting elements disposed in a first direction, a light blocking member including an aperture stop through which lights emitted from the light emitting elements pass, and an image forming optical system that makes an image by using the lights having passed through the light blocking member. An absolute value of a magnification in the first direction of the image forming optical system is equal to or more than 0.7 times and is equal to or less than 0.8 times.
    Type: Grant
    Filed: September 29, 2010
    Date of Patent: January 15, 2013
    Assignee: Seiko Epson Corporation
    Inventors: Takeshi Sowa, Ken Ikuma, Ryuta Koizumi, Nozomu Inoue
  • Patent number: 8300076
    Abstract: A line head, includes: a substrate which is provided with a plurality of luminous element groups which respectively include a plurality of luminous elements in a first direction which emit light beams; a lens array which includes a plurality of imaging lenses which are provided corresponding to the plurality of luminous element groups; and a light shielding member which is disposed between the substrate and the lens array and includes a plurality of light guiding holes which correspond to the plurality of luminous element groups, wherein the lens array is away from the light shielding member, an inner diameter of each of the plurality of light guiding holes in the first direction is a first light guiding hole diameter, and a bore diameter of each of the plurality of imaging lenses in the first direction is a first lens diameter, and the first light guiding hole diameter is smaller than the first lens diameter.
    Type: Grant
    Filed: April 21, 2010
    Date of Patent: October 30, 2012
    Assignee: Seiko Epson Corporation
    Inventors: Yujiro Nomura, Nozomu Inoue, Ryuta Koizumi, Ken Ikuma
  • Patent number: 8274741
    Abstract: An exposure head, includes: a lens array that includes lenses that are arranged in a first direction and in a second direction orthogonal to the first direction; and a light emitting element substrate that is provided with light emitting elements that emit lights to be imaged by the lenses, wherein a relationship defined by a following formula: 1<L1/L2 is satisfied, where the symbol L1 denotes a length of the lens in the first direction and the symbol L2 denotes a length of the lens in the second direction.
    Type: Grant
    Filed: October 28, 2010
    Date of Patent: September 25, 2012
    Assignee: Seiko Epson Corporation
    Inventors: Ryuta Koizumi, Yujiro Nomura, Takeshi Sowa
  • Patent number: 8194112
    Abstract: An image forming apparatus includes a latent image carrier on which a latent image is formed; and a line head. The line head includes light-emitting elements arranged in a first direction; an aperture diaphragm; and an optical system that images light emitted from the light-emitting elements on a latent image carrier. The aperture diaphragm and the optical system are arranged in a second direction that is orthogonal to or substantially orthogonal to the first direction; and among the lenses included in the optical system, a lens located at the position closest to the aperture diaphragm is a multifocal lens.
    Type: Grant
    Filed: December 1, 2009
    Date of Patent: June 5, 2012
    Assignee: Seiko Epson Corporation
    Inventors: Takeshi Sowa, Yujiro Nomura, Ryuta Koizumi
  • Patent number: 8194106
    Abstract: A line head includes multiple light emitting element groups each including multiple light emitting elements. In each light emitting element group, the multiple light emitting elements are disposed in a two-dimensional arrangement so that a distance Gx is greater than a distance Gy. The light emitting element groups are arranged so that pitches Px are greater than pitches Py.
    Type: Grant
    Filed: October 21, 2009
    Date of Patent: June 5, 2012
    Assignee: Seiko Epson Corporation
    Inventors: Yujiro Nomura, Nozomu Inoue, Ryuta Koizumi, Ken Ikuma
  • Patent number: 8184140
    Abstract: An optical system of a line head images light emitted from first and second light emitting elements and includes a rotationally symmetric lens having a lens face. A first region of the lens face includes an intersection point of the lens face with the symmetry axis of the lens, and a second region surrounding a periphery of the first region. The shape of a boundary portion between the first and second regions has the relationship 0.5?<??, wherein ? is a first direction angle that a first chief ray emitted by the first light emitting element makes with a second chief ray emitted by the second light emitting element, and ?? is an angle that a tangent line to the first region at the boundary portion makes with a tangent line to the second region at the boundary portion in a first direction cross-section including the symmetry axis.
    Type: Grant
    Filed: December 1, 2009
    Date of Patent: May 22, 2012
    Assignee: Seiko Epson Corporation
    Inventors: Takeshi Sowa, Yujiro Nomura, Ryuta Koizumi
  • Patent number: 8179413
    Abstract: An image forming device includes: an exposure head having a plurality of light emitting elements arranged in a first direction, a first imaging optical system adapted to image light emitted from the light emitting elements, and a second imaging optical system disposed in a second direction with respect to the first imaging optical system; a latent image carrier movable in the second direction; a detection section adapted to detect a moving time the latent image carrier takes to move from a first position to a second position in the second direction; and a control section adapted to control the time from emission of a first part of the light emitting elements adapted to emit light to be imaged by the first imaging optical system to emission of a second part of the light emitting elements adapted to emit light to be imaged by the second imaging optical system based on the detection result of the detection section, thereby aligning a latent image formed on the latent image carrier by the first imaging optical sy
    Type: Grant
    Filed: January 26, 2011
    Date of Patent: May 15, 2012
    Assignee: Seiko Epson Corporation
    Inventors: Yujiro Nomura, Nozomu Inoue, Kiyoshi Tsujino, Ryuta Koizumi
  • Patent number: 8120635
    Abstract: An exposure head, includes: a lens array that includes a light transmissive substrate whose length in a first direction is greater than a length thereof in a second direction orthogonal to the first direction, a first lens that is arranged on the light transmissive substrate, and a second lens that is arranged on the light transmissive substrate at the first direction of the first lens, the first lens and the second lens being connected in the first direction; and a head substrate that is provided with a first light emitting element that emits a light toward the first lens and a second light emitting element that emits a light toward the second lens.
    Type: Grant
    Filed: January 13, 2009
    Date of Patent: February 21, 2012
    Assignee: Seiko Epson Corporation
    Inventors: Ryuta Koizumi, Yujiro Nomura, Takeshi Sowa
  • Patent number: 8089695
    Abstract: A line head includes: a positive lens system having two lenses with positive refractive power; an image-side lens array in which the image-side lens of the two lenses is arrayed in a plural number in first and second directions; an object-side lens array in which the object-side lens of the two lenses is arrayed in a plural number in the first and second directions; a light emitter array in which a plurality of light-emitting elements are arrayed on an object side of the positive lens system for the one positive lens system; and an aperture plate that forms an aperture diaphragm disposed on the object side of the positive lens system so that an image side is telecentric or approximately telecentric.
    Type: Grant
    Filed: September 16, 2008
    Date of Patent: January 3, 2012
    Assignee: Seiko Epson Corporation
    Inventors: Takeshi Sowa, Yujiro Nomura, Ryuta Koizumi