Patents by Inventor Koji Hirata

Koji Hirata 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: 20190179144
    Abstract: A compact head-up display device is provided. For that purpose, the head-up display device includes a projection optical system which includes an image forming unit to display image information and an ocular optical system to reflect light emitted from the image forming unit to display a virtual image. In the ocular optical system, a free-form surface lens and a free-form surface concave mirror are arranged in order from the image forming unit. The shape of the free-form surface concave mirror is such that curvature radius RY1 in projection on a vertical cross section of the coordinate system of an eye-box is smaller than curvature radius RX1 in projection on a horizontal cross section.
    Type: Application
    Filed: May 20, 2016
    Publication date: June 13, 2019
    Applicant: MAXELL, LTD.
    Inventors: Masahiko YATSU, Koji HIRATA, Shigeki HOSHINO
  • Patent number: 10309602
    Abstract: A vehicular lighting apparatus is relatively small, low cost, superior in mountability, and offers a superior design. The vehicular lighting apparatus attachable to a front end of a vehicle includes: a composite lens element that is a light guide element constructed by molding a translucent resin substantially into a plate-like shape; a planar light-emitting unit that emits illumination light; an optical system that transforms planar light from the light-emitting unit into linear light and that causes the linear transformed light to be incident on a rear side face of the light guide element; and a diffraction lens formed on the rear side face of the light guide element on which the linear transformed light is incident, and condensing the linear transformed light. The light condensed by the lens means is emitted from a front side face of the light guide element onto a road surface in front of the vehicle.
    Type: Grant
    Filed: July 18, 2018
    Date of Patent: June 4, 2019
    Assignee: MAXELL, LTD.
    Inventors: Koji Hirata, Masahiko Yatsu, Hiroyuki Kajikawa, Hiroyuki Nakamura
  • Patent number: 10310257
    Abstract: A head-up display device that displays information including a video in a part of a field of view of an operator (407) includes a video display device (420) that is arranged at a position deviated from the field of view of the operator and generates and projects video light for projecting the information and a transparent screen (410) that is arranged in a part of the field of view of the operator, and transmit light from the field of view and reflects projection light from the video display device in a direction of the operator. A solid-state light source device (421) that reflects and mixes light emitted from a plurality of light-emitting cells (40) and emits the light obtained by the mixing in a predetermined direction is used as a light source constituting the video display device.
    Type: Grant
    Filed: May 9, 2014
    Date of Patent: June 4, 2019
    Assignee: Maxell, Ltd.
    Inventors: Koji Hirata, Masahiko Yatsu, Akio Misawa
  • Patent number: 10310321
    Abstract: In order to improve a characteristic of an optical element, an optical element (polarizing filter) including a substrate 1S having a wire-grid region 1A and a peripheral region 2A positioned on an outer periphery thereof is made to have the following configuration. A wire-grid in which a plurality of line-shaped wires P10 made of Al and extending in a y direction are arranged at spaces S in an x direction is provided in the wire-grid region 1A of the substrate 1S, and a pattern (repetitive pattern) in which a plurality of protruding portions P20 made of Al are arranged is provided in the peripheral region 2A. This pattern is, for example, a checkerboard pattern. According to the above-mentioned configuration, the plurality of wires P10 can be arranged so that their respective ends are spaced apart from an end of the substrate 1S, so that the wires P10 can be prevented from being deformed and nicked.
    Type: Grant
    Filed: June 21, 2012
    Date of Patent: June 4, 2019
    Assignee: MAXELL, LTD.
    Inventors: Koji Hirata, Hiroyuki Minemura, Yumiko Anzai, Tetsuya Nishida, Jiro Yamamoto, Naoyuki Kofuji, Hidehiro Ikeda, Nobuyuki Kimura
  • Publication number: 20190137759
    Abstract: A small information display apparatus capable of displaying video information on a windshield as a virtual image is provided. An information display apparatus configured to display video information of a virtual image on a windshield of a conveyance includes: a liquid crystal panel arranged as a video display apparatus configured to form the video information; and a virtual image optical system provided with a windshield for displaying the virtual image at a front of the conveyance by reflecting video of the liquid crystal panel by means of the windshield. The virtual image optical system is configured by arranging a concave mirror and an optical element between the concave mirror and the video display apparatus.
    Type: Application
    Filed: April 26, 2016
    Publication date: May 9, 2019
    Inventors: Koji HIRATA, Masahiko YATSU, Toshinori SUGIYAMA, Kazuomi KANEKO, Shigeki HOSHINO
  • Publication number: 20190129075
    Abstract: A free-form surface lens is made of a transparent resin forming an oblique projection optical system including a free-form surface mirror in a projection type video display apparatus, this lens includes a lens effective region having a surface on which a predetermined free-form surface is formed, and an edge surface formed to surround the lens effective region, the lens effective region and the edge surface in a part of a circumference surrounding the lens effective region where the edge surface is not formed are joined to each other by at least either one of a curved surface and a flat surface set so as not to change a direction of a tilt of the lens effective region in vicinity of the lens effective region, and an end surface including at least either one of the curved surface and the flat surface is set as a tapered surface.
    Type: Application
    Filed: December 12, 2018
    Publication date: May 2, 2019
    Applicant: MAXELL, LTD.
    Inventors: Koji HIRATA, Masahiko YATSU, Yuki MATSUMIYA, Shuji KATO, Kayono KIMURA
  • Publication number: 20190129172
    Abstract: An object of the present invention is to provide a head-up display apparatus further reduced in size, the head-up display apparatus having: an image display apparatus including a light source and a display element; and a virtual image optical system in which light emitted from the image display apparatus is reflected by a windshield or a combiner of the vehicle so that a virtual image is displayed in front of the vehicle, wherein the virtual image optical system has a concave mirror and a distortion correcting lens, and the distortion correcting lens is disposed between the image display apparatus and the concave mirror, the concave mirror is disposed in a housing including an outer case along a shape of an effective light path area of the image light from the image display apparatus, and the image display apparatus is attached to part of an outer periphery of the housing.
    Type: Application
    Filed: April 24, 2017
    Publication date: May 2, 2019
    Inventors: Akio MISAWA, Nozomu SHIMODA, Kazuomi KANEKO, Koji HIRATA, Toshinori SUGIYAMA
  • Patent number: 10265831
    Abstract: Methods for manufacturing a rotational non-axisymmetric lens which is manufactured by grinding using a machining tool, manufacturing a molding die for the lens, manufacturing a rotational non-axisymmetric mirror, and manufacturing a molding die for the mirror are provided. The provided methods are methods for manufacturing a rotational non-axisymmetric lens partially including a non-axisymmetric surface, manufacturing a molding die for the lens, manufacturing a rotational non-axisymmetric mirror partially including a non-axisymmetric surface, and manufacturing a molding die for the mirror. When a rotational non-axisymmetric surface is formed while scanning a surface of a workpiece by grinding or cutting means, the rotational non-axisymmetric surface is ground or cut by the grinding or cutting means while scanning the surface with movement in a direction along a meridional surface of the rotational non-axisymmetric surface.
    Type: Grant
    Filed: January 27, 2015
    Date of Patent: April 23, 2019
    Assignee: Maxell, Ltd.
    Inventors: Koji Hirata, Masahiko Yatsu, Shuji Kato, Yuki Matsumiya
  • Publication number: 20190113672
    Abstract: Provided is a compact light source device that can be manufactured at a low cost and is suitable as an illumination light source for a display device of an electronic device such as an HUD or an ultra-compact projector. This light source device includes a solid-state light source, a collimating optical system that converts light having exited the solid-state light source into a substantially collimated light; and a light guide that allows the light having exited the collimating optical system to enter and allows this light to exit in a direction that differs from a direction of entry. The light source device further includes a polarization converting element that aligns polarization directions of the light exiting the light guide into one direction.
    Type: Application
    Filed: February 28, 2017
    Publication date: April 18, 2019
    Applicant: MAXELL, LTD.
    Inventors: Toshinori SUGIYAMA, Koji HIRATA, Yasuhiko KUNII
  • Patent number: 10264227
    Abstract: A projection-type image display device includes: a light source unit that irradiates video light to be magnified and projected onto a reflection mirror; a video processing unit that generates the video light to be magnified and projected on the basis of an external electrical signal and light irradiated from the light source unit; and a projection-type optical system that magnifies and projects the video light output from the video processing unit, wherein the light source unit includes a red (R) solid-state light source, a green (G) solid-state light source, and a blue (B) solid-state light source each of which is configured as at least a solid-state light emitting device and each solid-state light source is provided with a cooling member, and wherein driving power input to each solid-state light source is controlled on the basis of light emission characteristics or the state of the cooling member.
    Type: Grant
    Filed: May 9, 2014
    Date of Patent: April 16, 2019
    Assignee: Maxell, Ltd.
    Inventors: Koji Hirata, Tatsuya Ishikawa, Yuki Nagano
  • Patent number: 10233320
    Abstract: A thermoplastic resin composition includes 18 to 44 parts by mass of a copolymer (A) and 56 to 82 parts by mass of a copolymer (B) so that the total is 100 parts by mass, and further includes 0.1 to 0.3 parts by mass of an alkaline earth metal oxide (M) with respect to 100 parts by mass of the total of the graft copolymer (A) and the copolymer (B). Graft copolymer (A) is obtained by graft copolymerization a monomer mixture (II) containing an aromatic vinyl based monomer and a vinyl cyanide based monomer in the presence of a composite rubber polymer (I). The polymer (I) is composed of a diene rubber (i) and a cross-linked acrylic acid ester polymer (ii). Copolymer (B) is obtained by polymerization of a monomer mixture containing an aromatic vinyl based monomer and a vinyl cyanide based monomer.
    Type: Grant
    Filed: March 17, 2015
    Date of Patent: March 19, 2019
    Assignee: UMG ABS, LTD.
    Inventors: Hiroshi Tanigawa, Shigeki Hamamoto, Koji Hirata, Hirotoshi Saitou
  • Patent number: 10191363
    Abstract: Provided is a projection-type image display device which by means of a projection lens (2) magnifies and projects an optical image formed by a light source and an image display element, wherein an error indicator (5) for indicating anomalies in the device is disposed on the rear surface opposite the front surface of a device housing (1) to which the projection lens (2) is attached. The projection-type image display device further includes an AC voltage monitor unit (12) for monitoring voltage waveforms supplied form an external power source and retaining voltage waveform data during the latest prescribed period in a memory, and reads out the voltage waveform data from the external power source retained in the memory and displays the voltage waveform data on the error indicator (5) as said anomalies.
    Type: Grant
    Filed: February 9, 2012
    Date of Patent: January 29, 2019
    Assignee: MAXELL, LTD.
    Inventors: Koji Hirata, Miyuki Ikeda, Tatsuya Ishikawa, Hiroyuki Shinji
  • Publication number: 20190025680
    Abstract: A projection-type image display apparatus has a projection optical system that can sufficiently meet requirements for significant reduction in a throw distance and a large image and that can downsize. A projection image display apparatus of an oblique type comprising, inside a housing: a light source; an image display element configured to modulate an intensity of light from the light source in accordance with an image signal; and a projection lens system including a plurality of lenses configured to project image light onto a projection plane from an oblique direction, the image light being modulated from the image display element. The projection lens system has a lens integrally having an aspherical lens surface and a freeform lens surface, and the lens integrally having the aspherical lens surface and the freeform lens surface is arranged in the projection lens system so that light components of luminous flux are separated.
    Type: Application
    Filed: January 19, 2016
    Publication date: January 24, 2019
    Applicant: MAXELL, LTD.
    Inventors: Koji HIRATA, Masahiko YATSU, Yuki MATSUMIYA, Masanori TAKAJI
  • Patent number: 10185060
    Abstract: A free-form surface lens is made of a transparent resin forming an oblique projection optical system including a free-form surface mirror in a projection type video display apparatus, this lens includes a lens effective region having a surface on which a predetermined free-form surface is formed, and an edge surface formed to surround the lens effective region, the lens effective region and the edge surface in a part of a circumference surrounding the lens effective region where the edge surface is not formed are joined to each other by at least either one of a curved surface and a flat surface set so as not to change a direction of a tilt of the lens effective region in vicinity of the lens effective region, and an end surface including at least either one of the curved surface and the flat surface is set as a tapered surface.
    Type: Grant
    Filed: May 29, 2014
    Date of Patent: January 22, 2019
    Assignee: MAXELL, LTD.
    Inventors: Koji Hirata, Masahiko Yatsu, Yuki Matsumiya, Shuji Kato, Kayono Kimura
  • Publication number: 20190003673
    Abstract: A vehicular lighting apparatus which is relatively small, low cost, superior in mountability to an automobile, and superior in recognizeability of an object illuminated by a head lamp. The apparatus includes: a composite lens element that is a light guide element constructed by molding a translucent resin substantially into a plate-like shape; a planar light-emitting unit that emits light; an optical system that transforms planar light from the light-emitting unit into linear light and that causes the linear transformed light to be incident on a rear side face of the light guide element; and a diffraction lens formed on the rear side face of the light guide element on which the linear transformed light is incident, and condensing the linear transformed light. The light condensed by the lens means is emitted from a front side face of the light guide element onto a road surface in front of the vehicle.
    Type: Application
    Filed: September 5, 2018
    Publication date: January 3, 2019
    Applicant: MAXELL, LTD.
    Inventors: Koji HIRATA, Masahiko YATSU, Hiroyuki KAJIKAWA, Hiroyuki NAKAMURA
  • Publication number: 20180347775
    Abstract: A solid state light source device includes N (an integer of two or more) sets of solid state light source assemblies having a plurality of solid state light source cells arranged in a matrix pattern a multiple lens block including N incidence faces facing the N sets of solid state light source assemblies and causing light emitted from the solid state light source cells to be incident through multiple lens cells of a matrix pattern and one emission face composing the light incident from the N incidence faces and a dichroic filter that is obliquely arranged on the incidence faces inside the multiple lens block and selectively reflects or transmits incident light based on the incident light wavelength. Light distribution characteristics and color temperature of light exiting the emission face of the multiple lens block are controlled by a ratio of power supplied to the solid state light source cells.
    Type: Application
    Filed: July 19, 2018
    Publication date: December 6, 2018
    Applicant: MAXELL, LTD.
    Inventors: Koji HIRATA, Yuki NAGANO, Shoji YAMAMOTO, Yoshiho SEO
  • Publication number: 20180341110
    Abstract: Provided is a small-sized information display device displaying video image information as a virtual image by use of an eyepiece optical system including a concave mirror having desired reflection characteristics in a specific polarization direction, where a liquid crystal display panel is used as a video image light source. The information display device has a liquid crystal display panel as a flat display forming video image information disposed therein, and includes a virtual image optical system including a member to be projected for displaying virtual images in front of a vehicle by making a video image displayed on the liquid crystal display panel reflect on the member to be projected. The virtual image optical system includes a concave mirror, and a reflective film of the concave mirror has desired reflection characteristics in a specific polarization direction, so that virtual images having uniform brightness and chromaticity can be obtained.
    Type: Application
    Filed: October 27, 2015
    Publication date: November 29, 2018
    Inventors: Koji HIRATA, Masahiko YATSU, Toshinori SUGIYAMA, Hiroyuki KAJIKAWA, Kazuomi KANEKO
  • Publication number: 20180340665
    Abstract: A vehicular lighting apparatus is relatively small, low cost, superior in mountability, and offers a superior design. The vehicular lighting apparatus attachable to a front end of a vehicle includes: a composite lens element that is a light guide element constructed by molding a translucent resin substantially into a plate-like shape; a planar light-emitting unit that emits illumination light; an optical system that transforms planar light from the light-emitting unit into linear light and that causes the linear transformed light to be incident on a rear side face of the light guide element; and a diffraction lens formed on the rear side face of the light guide element on which the linear transformed light is incident, and condensing the linear transformed light. The light condensed by the lens means is emitted from a front side face of the light guide element onto a road surface in front of the vehicle.
    Type: Application
    Filed: July 18, 2018
    Publication date: November 29, 2018
    Applicant: MAXELL, LTD.
    Inventors: Koji HIRATA, Masahiko YATSU, Hiroyuki KAJIKAWA, Hiroyuki NAKAMURA
  • Publication number: 20180314063
    Abstract: A head-up display device includes: an image formation unit which emits light including image information; and a projection optical system including an ocular optical system which displays a virtual image by reflecting the light emitted from the image formation unit. The ocular optical system includes spherical lenses, a free-form curved surface lens, a reflection mirror, and a free-form curved surface mirror, and is configured by arranging, in a space on the side of the ocular optical system of a plane conjugate with the virtual image plane with respect to the ocular optical system, a first small lens system which achieves first focus position movement and on which separated light from the image formation unit is made to be incident, and a second small lens system which achieves second focus position movement and on which separated light from the image formation unit is made to be incident.
    Type: Application
    Filed: October 9, 2015
    Publication date: November 1, 2018
    Inventors: Masahiko YATSU, Koji HIRATA, Kazuomi KANEKO
  • Patent number: 10100995
    Abstract: A vehicular lighting apparatus which is relatively small, lower in cost, and superior in recognizeability of an object illuminated by a head lamp includes a composite lens element that is a light guide element constructed by molding a translucent resin substantially into a plate-like shape; a planar light-emitting unit that emits light; an optical system that transforms planar light from the light-emitting unit into linear light and that causes the linear transformed light to be incident on a rear side face of the light guide element; and a diffraction lens formed on the rear side face of the light guide element on which the linear transformed light is incident, and condensing the linear transformed light. The light condensed by the lens means is emitted from a front side face of the light guide element onto a road surface in front of the vehicle.
    Type: Grant
    Filed: September 30, 2014
    Date of Patent: October 16, 2018
    Assignee: MAXELL, LTD.
    Inventors: Koji Hirata, Masahiko Yatsu, Hiroyuki Kajikawa, Hiroyuki Nakamura