Patents by Inventor Tomohiro Miyashita

Tomohiro Miyashita 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).

  • Patent number: 7245425
    Abstract: A microscope optical system comprises an objective lens and an intermediate magnification varying part disposed just after the image side of the objective lens. A microscope objective lens according to another aspect of the invention comprises a first lens group and a second lens group in the mentioned order from the object side. The first lens group includes a positive meniscus lens with the concave surface facing the object side and one or more cemented lenses, the first lens group having a positive refractive power as a whole, at least one of the cemented lenses includes a lens made of a material having an Abbe's number equal to or larger than 80, and conditions 0.3?wd/f?0.45 and 0.6?NA are satisfied, where f represents the focal length of the microscope objective lens as a whole, wd represents the working distance of the microscope objective lens, and NA represents the numerical aperture of the microscope objective lens.
    Type: Grant
    Filed: November 26, 2003
    Date of Patent: July 17, 2007
    Assignee: Nikon Corporation
    Inventor: Tomohiro Miyashita
  • Patent number: 7079314
    Abstract: A catadioptric optical system comprising a first imaging optical system for forming an intermediate image of a first plane surface, a second imaging optical system for forming a final image of the first plane surface onto a second plane surface which is substantially parallel to the first plane surface, and a catadioptric type optical system disposed in the optical path from the first plane surface to the second plane surface and including a first reflecting surface which reflects light coming from through the first plane surface and a second reflecting surface for directing the light reflected by the first reflecting surface toward the second plane surface. At least one of the first and second reflecting surfaces is a concave reflecting surface. All of the optical elements of the catadioptric optical system are disposed on a single linear optical axis.
    Type: Grant
    Filed: July 12, 2000
    Date of Patent: July 18, 2006
    Assignee: Nikon Corporation
    Inventors: Yutaka Suenaga, Tomohiro Miyashita, Kotaro Yamaguchi
  • Patent number: 6985288
    Abstract: A microscopic illumination apparatus to be applied to a microscope selectively using plural types of objective lenses having different magnifications comprises a light source, a collector lens for making a light flux emitted from the light source a substantially parallel light flux, and at least two fly-eye lenses disposed side by side along the optical axis at the back of the collector lens. A space between the two fly-eye lenses is variable in accordance with an objective lens to be used in the microscope.
    Type: Grant
    Filed: May 22, 2003
    Date of Patent: January 10, 2006
    Assignee: Nikon Corporation
    Inventors: Tomohiro Miyashita, Nobuhiro Shinada
  • Publication number: 20040105164
    Abstract: A microscope optical system comprises an objective lens and an intermediate magnification varying part disposed just after the image side of the objective lens. A microscope objective lens according to another aspect of the invention comprises a first lens group and a second lens group in the mentioned order from the object side. The first lens group includes a positive meniscus lens with the concave surface facing the object side and one or more cemented lenses, the first lens group having a positive refractive power as a whole, at least one of the cemented lenses includes a lens made of a material having an Abbe's number equal to or larger than 80, and conditions 0.3≦wd/f≦0.45 and 0.6≦NA are satisfied, where f represents the focal length of the microscope objective lens as a whole, wd represents the working distance of the microscope objective lens, and NA represents the numerical aperture of the microscope objective lens.
    Type: Application
    Filed: November 26, 2003
    Publication date: June 3, 2004
    Applicant: Nikon Corporation
    Inventor: Tomohiro Miyashita
  • Publication number: 20030223108
    Abstract: A microscopic illumination apparatus to be applied to a microscope selectively using plural types of objective lenses having different magnifications comprises a light source, a collector lens for making a light flux emitted from the light source a substantially parallel light flux, and at least two fly-eye lenses disposed side by side along the optical axis at the back of the collector lens. A space between the two fly-eye lenses is variable in accordance with an objective lens to be used in the microscope.
    Type: Application
    Filed: May 22, 2003
    Publication date: December 4, 2003
    Applicant: Nikon Corporation
    Inventors: Tomohiro Miyashita, Nobuhiro Shinada
  • Patent number: 6507434
    Abstract: An illumination apparatus, having a light source that supplies illumination light, a collector lens that converts a divergent light flux emitted from the light source into a plurality of substantially parallel light fluxes, a fly-eye lens, comprised of a plurality of small lens elements and an exit surface, disposed at a rear focal position of the collector lens and a relay optical system that relays a pseudo plane light source which is formed on the exit surface of the fly-eye lens to an aperture stop or a surface conjugate to the aperture stop, where a focal length of at least one of the plurality of small lens elements is 8≦focal length ≦24, a radius of at least one of the plurality of small lens elements is 1≦radius ≦3 and a consistent unit of length is used for the focal length and radius.
    Type: Grant
    Filed: June 20, 2001
    Date of Patent: January 14, 2003
    Assignee: Nikon Corporation
    Inventor: Tomohiro Miyashita
  • Publication number: 20020012164
    Abstract: A microscopic illumination apparatus, comprises a light source for supplying illumination light, a collector lens for converting a divergent light flux emitted from the light source into substantially parallel light fluxes, a fly-eye lens disposed at a rear focal position of said collector lens, and a relay optical system for relaying a pseudo plane light source which is formed on an exit end surface of the fly-eye lens to an aperture stop or a surface conjugate to the aperture stop.
    Type: Application
    Filed: June 20, 2001
    Publication date: January 31, 2002
    Applicant: Nikon Corporation
    Inventor: Tomohiro Miyashita
  • Patent number: 6259557
    Abstract: Disclosed is a dark field illumination apparatus which is capable of performing a dark field illumination which exhibits a sufficient brightness and a sufficiently suppressed unevenness in brightness. The apparatus comprises a shaping system for shaping a light beam from a light source into approximately parallel beam having a ring- shaped section; a fly-eye optical device for forming a plurality of light source images in the vicinity of its exit plane based on the approximately parallel beam, the light source images being arranged circularly; and a light collection optical system for collecting light beams from the light source images and superposing them on an object plane.
    Type: Grant
    Filed: October 28, 1999
    Date of Patent: July 10, 2001
    Assignee: Nikon Corporation
    Inventors: Tomohiro Miyashita, Yutaka Suenaga