Patents by Inventor Tomohiko Yamahiro

Tomohiko Yamahiro 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).

  • INVERTED EQUAL-MAGNIFICATION RELAY LENS AND CAMERA SYSTEM
    Publication number: 20190212530
    Abstract: An inverted equal-magnification relay lens includes, in order from an object side: a first lens group having a positive power, and disposed near an object; a second lens group having a positive power, and disposed at a predetermined distance from the first lens group; and a third lens group having a negative power; wherein an entrance pupil position is more toward an object surface side than the first lens group, an exit pupil position is more toward a third lens group side than an image surface, and the following Formulas (1) and (2) are satisfied: 0.65?|G1F/G2F|?2.0 . . . (1); 0.35?|G3F/G2F|?3.1 . . . (2); where: G1F: a focal length of the first lens group; G2F: a focal length of the second lens group; and G3F: a focal length of the third lens group.
    Type: Application
    Filed: March 13, 2019
    Publication date: July 11, 2019
    Applicant: NIKON CORPORATION
    Inventor: Tomohiko YAMAHIRO
  • Inverted equal-magnification relay lens and camera system
    Patent number: 10281693
    Abstract: An inverted equal-magnification relay lens includes, in order from an object side: a first lens group having a positive power, and disposed near an object; a second lens group having a positive power, and disposed at a predetermined distance from the first lens group; and a third lens group having a negative power; wherein an entrance pupil position is more toward an object surface side than the first lens group, an exit pupil position is more toward a third lens group side than an image surface, and the following Formulas (1) and (2) are satisfied: 0.65?|G1F/G2F|?2.0 . . . (1); 0.35?|G3F/G2F|?3.1 . . . (2); where: G1F: a focal length of the first lens group; G2F: a focal length of the second lens group; and G3F: a focal length of the third lens group.
    Type: Grant
    Filed: May 8, 2015
    Date of Patent: May 7, 2019
    Assignee: NIKON CORPORATION
    Inventor: Tomohiko Yamahiro
  • Inverted Equal - Magnification Relay Lens And Camera System
    Publication number: 20170192209
    Abstract: An inverted equal-magnification relay lens includes, in order from an object side: a first lens group having a positive power, and disposed near an object; a second lens group having a positive power, and disposed at a predetermined distance from the first lens group; and a third lens group having a negative power; wherein an entrance pupil position is more toward an object surface side than the first lens group, an exit pupil position is more toward a third lens group side than an image surface, and the following Formulas (1) and (2) are satisfied: 0.65?|G1F/G2F|?2.0 . . . (1); 0.35?|G3F/G2F|?3.1 . . . (2); where: G1F: a focal length of the first lens group; G2F: a focal length of the second lens group; and G3F: a focal length of the third lens group.
    Type: Application
    Filed: May 8, 2015
    Publication date: July 6, 2017
    Applicant: NIKON CORPORATION
    Inventor: Tomohiko YAMAHIRO
  • Optical member and method for manufacturing the same
    Patent number: 7760447
    Abstract: A method, for producing an optical member, includes attaching a holding member, which is used integrally with a lens, to the lens so that the holding member is brought into contact with a periphery of the lens to hold the lens, and then forming an optical thin film on a surface of the lens by a spin coating to obtain the optical member.
    Type: Grant
    Filed: May 21, 2009
    Date of Patent: July 20, 2010
    Assignee: Nikon Corporation
    Inventors: Hitoshi Ishizawa, Tomohiko Yamahiro, Yasuto Matsuba
  • OPTICAL MEMBER AND METHOD FOR MANUFACTURING THE SAME
    Publication number: 20090284848
    Abstract: A method, for producing an optical member, includes attaching a holding member, which is used integrally with a lens, to the lens so that the holding member is brought into contact with a periphery of the lens to hold the lens, and then forming an optical thin film on a surface of the lens by a spin coating to obtain the optical member.
    Type: Application
    Filed: May 21, 2009
    Publication date: November 19, 2009
    Inventors: HITOSHI ISHIZAWA, Tomohiko Yamahiro, Yasuto Matsuba
  • Stereomicroscope and dark field illumination apparatus
    Patent number: 6456431
    Abstract: A stereomicroscope has a dark field illumination apparatus capable of irradiating a subject with the light from a light source at a high efficiency by providing an optical system through which regularly reflected light beams are overlapped with each other by an annular reflective member with less ununiformity of the illumination.
    Type: Grant
    Filed: December 27, 2000
    Date of Patent: September 24, 2002
    Assignee: Nikon Corporation
    Inventor: Tomohiko Yamahiro
  • Stereomicroscope and dark field illumination apparatus
    Publication number: 20010005279
    Abstract: A stereomicroscope has a dark field illumination apparatus capable of irradiating a subject with the light from a light source at a high efficiency by providing an optical system through which regularly reflected light beams are overlapped with each other by an annular reflective member with less ununiformity of the illumination.
    Type: Application
    Filed: December 27, 2000
    Publication date: June 28, 2001
    Applicant: Nikon Corporation
    Inventor: Tomohiko Yamahiro