Patents by Inventor Masatoshi Yonekubo

Masatoshi Yonekubo 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: 20200004026
    Abstract: A head-mounted display apparatus includes a cross dichroic prism including four triangular prisms that are mutually bonded, and a first dichroic film and a second dichroic film provided between adjacent prisms of the four triangular prisms, a plurality of display panels arranged respectively opposite to a plurality of light incident planes of the cross dichroic prism, and a projection optical system configured to project light emitted from the cross dichroic prism onto a pupil of a user. The cross dichroic prism includes an optically imperfect part at a center of a bonded part of the four triangular prisms. A ratio between an aerial conversion length from each of light-emission planes of the plurality of display panels to the center of the bonded part, and a width of the optically imperfect part, is greater than or equal to 250:1.
    Type: Application
    Filed: June 28, 2019
    Publication date: January 2, 2020
    Applicant: SEIKO EPSON CORPORATION
    Inventors: Masatoshi YONEKUBO, Akio FUKASE
  • Publication number: 20200004034
    Abstract: An optical module according to the present disclosure includes a cross dichroic prism, a first display panel, a second display panel, a third display panel, a first adhesive layer configured to bond the first display panel to the cross dichroic prism, a second adhesive layer configured to bond the second display panel to the cross dichroic prism, and a third adhesive layer configured to bond the third display panel to the cross dichroic prism. At least one of the first adhesive layer, the second adhesive layer, and the third adhesive layer includes a spacer member.
    Type: Application
    Filed: June 28, 2019
    Publication date: January 2, 2020
    Applicant: SEIKO EPSON CORPORATION
    Inventors: Masatoshi YONEKUBO, Hiroyuki TATSUGI, Hidemitsu SORIMACHI
  • Patent number: 10495888
    Abstract: An image display device is capable of easily adjusting a diopter scale with respect to a virtual image. The image display device includes an image generating unit that emits image light including image information, a first optical system that forms an intermediate image by condensing the image light, a second optical system that guides a virtual image to eyes of a viewer by deflecting the light from the intermediate image, and guides the light to the eyes of the viewer by transmitting external light, and an intermediate image position changing device that adjusts a position of the virtual image in depth direction by changing a position of the intermediate image.
    Type: Grant
    Filed: February 1, 2016
    Date of Patent: December 3, 2019
    Assignee: SEIKO EPSON CORPORATION
    Inventors: Masatoshi Yonekubo, Mitsutaka Ide
  • Patent number: 10495883
    Abstract: An image display device with which it is possible to visually recognize an image while securing the see-through property regardless of eye movements and changes in interpupillary distance, with which it is possible to display a large-size image with high quality, and which is small, has excellent wearability, and has an excellent external appearance.
    Type: Grant
    Filed: October 19, 2018
    Date of Patent: December 3, 2019
    Assignee: SEIKO EPSON CORPORATION
    Inventors: Osamu Yokoyama, Masatoshi Yonekubo, Takashi Takeda, Daisuke Ishida, Mitsutaka Ide, Hidemitsu Sorimachi
  • Patent number: 10409069
    Abstract: A display device includes a first diffraction element configured to diffract image light and a second diffraction element disposed on as optical path between a light source and the first diffraction element. The first and the second diffraction element emit light beams that have highest diffraction efficiencies in one direction when a single wave light enters from directions of normals. If the sum of the number of reflections of light and the number of times of intermediate image generation between the second diffraction element and the first diffraction element is an even number, in the first and the second diffraction element, the directions of the diffraction light having the highest diffraction efficiencies are output when light enters from the directions of the normals are the same with respect to the directions of the normals to the incident planes. If the sum is an odd number, the directions are opposite.
    Type: Grant
    Filed: May 18, 2018
    Date of Patent: September 10, 2019
    Assignee: SEIKO EPSON CORPORATION
    Inventors: Toshiyuki Noguchi, Masatoshi Yonekubo
  • Patent number: 10401554
    Abstract: A light-guiding device used in a display device includes a plurality of first half mirrors between a first light-guiding body and a second light-guiding body. Each of the first half mirrors is formed on a first surface extending along a first direction of the first surface and a second surface extending along a second direction in the first light-guiding body. The first light-guiding body includes a third surface overlapping the second surface in a direction along a third direction in which two first surfaces located on both sides of the second surface do not overlap each other between the first surface and the second surface. The third surface extends in a direction different from the first direction.
    Type: Grant
    Filed: September 27, 2018
    Date of Patent: September 3, 2019
    Assignee: SEIKO EPSON CORPORATION
    Inventors: Shohei Yoshida, Atsushi Saito, Hiroyuki Tatsugi, Masatoshi Yonekubo
  • Publication number: 20190235266
    Abstract: In an optical system, a first optical section having positive power, a second optical section provided with a first diffractive element and having positive power, a third optical section having positive power, and a fourth optical section provided with a second diffractive element and having positive power are disposed along a light path of image light emitted from an image light generation device. A first intermediate image of the image light is formed between the first optical section and the third optical section, a pupil is formed in the vicinity of the third optical section, a second intermediate image of the image light is formed between the third optical section and the fourth optical section, and the fourth optical section collimates the image light to form an exit pupil. The first diffractive element and the second diffractive element are in a conjugate relation or a roughly conjugate relation.
    Type: Application
    Filed: January 25, 2019
    Publication date: August 1, 2019
    Applicant: SEIKO EPSON CORPORATION
    Inventors: Mitsutaka IDE, Masatoshi YONEKUBO
  • Patent number: 10302948
    Abstract: A display device of the embodiment includes an image generating unit which emits a light including an image information, and a light guide optical system which generates an image from the light which is emitted from the image generating unit at a position of an exit pupil, in which the light guide optical system is provided with a first mirror (a first deflection unit) which deflects the light which is emitted from the image generating unit, and a second mirror (a second deflection unit) which further deflects the light which is deflected by the first mirror to guide the light to the position of the exit pupil and transmits a portion of external light, and in which an optical axis of the light which propagates from the first mirror toward the second mirror and an optical axis of the exit pupil form an acute angle.
    Type: Grant
    Filed: September 25, 2015
    Date of Patent: May 28, 2019
    Assignee: SEIKO EPSON CORPORATION
    Inventors: Mitsutaka Ide, Masatoshi Yonekubo
  • Patent number: 10282906
    Abstract: A virtual image display device including an image generator for generating a picture light beam modulated based on a video signal, and an optical element including a plane of incidence to which the picture light beam emitted from the image generator is input, and an exit surface emitting the picture light beam after a cross-sectional area of the picture light beam input to the plane of incidence has been enlarged. The optical element includes a first light guide and a second light guide connecting the plane of incidence and the exit surface and guiding the picture light beam. A first light branching layer is disposed between the first and second light guides, and partially reflects and partially transmits the picture light beam. The picture light beam emitted from the image generator obliquely enters the first light branching layer.
    Type: Grant
    Filed: March 26, 2015
    Date of Patent: May 7, 2019
    Assignee: Seiko Epson Corporation
    Inventor: Masatoshi Yonekubo
  • Publication number: 20190094451
    Abstract: A light-guiding device used in a display device includes a plurality of first half mirrors between a first light-guiding body and a second light-guiding body. Each of the first half mirrors is formed on a first surface extending along a first direction of the first surface and a second surface extending along a second direction in the first light-guiding body. The first light-guiding body includes a third surface overlapping the second surface in a direction along a third direction in which two first surfaces located on both sides of the second surface do not overlap each other between the first surface and the second surface. The third surface extends in a direction different from the first direction.
    Type: Application
    Filed: September 27, 2018
    Publication date: March 28, 2019
    Applicant: SEIKO EPSON CORPORATION
    Inventors: Shohei YOSHIDA, Atsushi SAITO, Hiroyuki TATSUGI, Masatoshi YONEKUBO
  • Patent number: 10241336
    Abstract: In a retinal scanning display device, a scanning section scans a light beam emitted from a light source to form a scanned image. The light beam emitted from the scanning section is expanded in beam width of the light beam in a first direction by a first beam width expander. The first beam width expander includes alternately stacked first partially reflective layers and first light-transmissive layers disposed between a pair of first reflection faces that face each other in the first direction. The plural partially reflective layers include a partially reflective layer having a transmittance exceeding 50%. This enables the light intensity distribution to be appropriately adjusted in the first direction for a light beam expanded in the first direction.
    Type: Grant
    Filed: September 6, 2017
    Date of Patent: March 26, 2019
    Assignee: SEIKO EPSON CORPORATION
    Inventors: Mitsutaka Ide, Masatoshi Yonekubo
  • Publication number: 20190049735
    Abstract: An image display device with which it is possible to visually recognize an image while securing the see-through property regardless of eye movements and changes in interpupillary distance, with which it is possible to display a large-size image with high quality, and which is small, has excellent wearability, and has an excellent external appearance.
    Type: Application
    Filed: October 19, 2018
    Publication date: February 14, 2019
    Applicant: SEIKO EPSON CORPORATION
    Inventors: Osamu YOKOYAMA, Masatoshi YONEKUBO, Takashi TAKEDA, Daisuke ISHIDA, Mitsutaka IDE, Hidemitsu SORIMACHI
  • Publication number: 20190041650
    Abstract: A display apparatus includes an image forming device, first and second light guide members that respectively have first and second light incidence portions and first and second light emission portions, a first diffractive optical element provided in the first light emission portion, a second diffractive optical element provided in the second light emission portion, and a first external light noise reduction element provided over the second light guide member. The first external light noise reduction element overlaps the first and second light emission portions. The first light incidence portion overlaps the second light incidence portion. Image light from the image forming device is incident on the first light incidence portion. A part of the image light is guided in the first light guide member. Another part of the image light is incident on the second light incidence portion and is guided in the second light guide member.
    Type: Application
    Filed: October 9, 2018
    Publication date: February 7, 2019
    Inventors: Fumika Yamada, Masatoshi Yonekubo, Osamu Yokoyama
  • Patent number: 10139630
    Abstract: An image display device with which it is possible to visually recognize an image while securing the see-through property regardless of eye movements and changes in interpupillary distance, with which it is possible to display a large-size image with high quality, and which is small, has excellent wearability, and has an excellent external appearance.
    Type: Grant
    Filed: September 17, 2015
    Date of Patent: November 27, 2018
    Assignee: SEIKO EPSON CORPORATION
    Inventors: Osamu Yokoyama, Masatoshi Yonekubo, Takashi Takeda, Daisuke Ishida, Mitsutaka Ide, Hidemitsu Sorimachi
  • Publication number: 20180267316
    Abstract: A display device includes a first diffraction element configured to diffract image light and a second diffraction element disposed on as optical path between a light source and the first diffraction element. The first and the second diffraction element emit light beams that have highest diffraction efficiencies in one direction when a single wave light enters from directions of normals. If the sum of the number of reflections of light and the number of times of intermediate image generation between the second diffraction element and the first diffraction element is an even number, in the first and the second diffraction element, the directions of the diffraction light having the highest diffraction efficiencies are output when light enters from the directions of the normals are the same with respect to the directions of the normals to the incident planes. If the sum is an odd number, the directions are opposite.
    Type: Application
    Filed: May 18, 2018
    Publication date: September 20, 2018
    Applicant: SEIKO EPSON CORPORATION
    Inventors: Toshiyuki NOGUCHI, Masatoshi YONEKUBO
  • Patent number: 10025009
    Abstract: An optical device includes a light-conducting member, having a first panel surface disposed facing an image forming unit, that conducts image light incident on a light entry plane formed at an end of the first panel surface to a light exit plane formed in front of the viewer's eye; a first diffractive optics element, provided on the light entry plane, that diffracts the image light incident on the light entry plane in a predetermined direction and transmits that light into the light-conducting member; a second diffractive optics element, provided on the light exit plane, that diffracts the image light exiting from the light exit plane in a predetermined direction and transmits that light to the front of the viewer's eye; and one or more reflective planes disposed within a waveguide for the image light diffracted by the first diffractive optics element.
    Type: Grant
    Filed: January 15, 2014
    Date of Patent: July 17, 2018
    Assignee: Seiko Epson Corporation
    Inventors: Fumika Yamada, Masatoshi Yonekubo, Osamu Yokoyama
  • Patent number: 10001651
    Abstract: A display device includes a first diffraction element configured to diffract image light and a second diffraction element disposed on an optical path between a light source and the first diffraction element. The first and the second diffraction element emit light beams that have highest diffraction efficiencies in one direction when a single wave light enters from directions of normals. If the sum of the number of reflections of light and the number of times of intermediate image generation between the second diffraction element and the first diffraction element is an even number, in the first and the second diffraction element, the directions of the diffraction light having the highest diffraction efficiencies are output when light enters from the directions of the normals are the same with respect to the directions of the normals to the incident planes. If the sum is an odd number, the directions are opposite.
    Type: Grant
    Filed: February 21, 2017
    Date of Patent: June 19, 2018
    Assignee: SEIKO EPSON CORPORATION
    Inventors: Toshiyuki Noguchi, Masatoshi Yonekubo
  • Patent number: 9958679
    Abstract: An electro-optical device includes: a light source which generates a light beams having various angle components; and a first optical element includes a plurality of light guiding materials are bonded to each other via a half mirror layer. The first optical element includes a first surface and a second surface, an incident surface is formed so as to intersect the first surface at a first angle, an emitting surface is formed so as to intersect the first surface at a second angle. A first part of the light is a light reflected by the second surface, and is incident on the emitting surface. The first optical element is formed so that the first part of the light is reflected by the emitting surface, with angles of the first angle and the second angle, and with a refractive index of the plurality of light guiding materials.
    Type: Grant
    Filed: March 16, 2015
    Date of Patent: May 1, 2018
    Assignee: Seiko Epson Corporation
    Inventors: Mitsutaka Ide, Masatoshi Yonekubo, Takashi Takeda
  • Publication number: 20180088341
    Abstract: In a retinal scanning display device, a scanning section scans a light beam emitted from a light source to form a scanned image. The light beam emitted from the scanning section is expanded in beam width of the light beam in a first direction by a first beam width expander. The first beam width expander includes alternately stacked first partially reflective layers and first light-transmissive layers disposed between a pair of first reflection faces that face each other in the first direction. The plural partially reflective layers include a partially reflective layer having a transmittance exceeding 50%. This enables the light intensity distribution to be appropriately adjusted in the first direction for a light beam expanded in the first direction.
    Type: Application
    Filed: September 6, 2017
    Publication date: March 29, 2018
    Applicant: SEIKO EPSON CORPORATION
    Inventors: Mitsutaka IDE, Masatoshi YONEKUBO
  • Publication number: 20180067326
    Abstract: An image display device is capable of easily adjusting a diopter scale with respect to a virtual image. The image display device includes an image generating unit that emits image light including image information, a first optical system that forms an intermediate image by condensing the image light, a second optical system that guides a virtual image to eyes of a viewer by deflecting the light from the intermediate image, and guides the light to the eyes of the viewer by transmitting external light, and an intermediate image position changing device that adjusts a position of the virtual image in depth direction by changing a position of the intermediate image.
    Type: Application
    Filed: February 1, 2016
    Publication date: March 8, 2018
    Applicant: SEIKO EPSON CORPORATION
    Inventors: Masatoshi YONEKUBO, Mitsutaka IDE