Patents by Inventor Masahiro Shibutani

Masahiro Shibutani 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: 20020049387
    Abstract: The eye's optical characteristic measuring system of the present invention comprises a projection system 2 for projecting a primary index image on fundus of an eye under testing, a photodetection system 3 for forming a secondary index image on a photoelectric detector 21 from a reflection light beam of the primary index image, detection systems 26, 27 and 28 for measuring a light amount intensity distribution characteristic of the secondary index image based on a signal from the photoelectric detector, a correction optical system 12 arranged in an optical path shared in common with the photodetection system and the detection system and for focusing the primary index image on the fundus of the eye under testing in corrected condition according to ocular refractive characteristic of the eye under testing, and a light beam switching means 13 for switching over to a first condition to guide the reflection light beam including the scattering reflection light beam from the fundus of the eye under testing to the pho
    Type: Application
    Filed: October 5, 2001
    Publication date: April 25, 2002
    Inventors: Katsuhiko Kobayashi, Gaku Takeuchi, Masahiro Shibutani
  • Publication number: 20020047993
    Abstract: An eye's optical characteristic measuring system comprises an aperture diaphragm 14 arranged at a position approximately conjugate to a pupil of an eye 1 under testing and for determining regions to pass a light beam on the pupil 18, a projection optical system 2 for projecting a primary index image on a fundus of the eye under testing via the aperture diaphragm, a photodetection optical system 3 for forming a secondary index image on a photoelectric detector 21 via the aperture diaphragm by a reflected light beam from the fundus of the eye under testing, and detecting units 26, 27 and 28 for detecting a light amount intensity distribution of the secondary index image based on a signal from the photoelectric detector.
    Type: Application
    Filed: October 5, 2001
    Publication date: April 25, 2002
    Inventors: Gaku Takeuchi, Katsuhiko Kobayashi, Masahiro Shibutani
  • Patent number: 6217172
    Abstract: An ophthalmologic measuring system, comprising a light source unit 4 for emitting an illuminating light beam for illuminating a fundus of each of both eyes of a person under measurement, a projection optical system 1 for projecting the illuminating light beam from said light source unit to the fundus of each of the eyes of the person under measurement, a photodetection optical system 2 including a light blocking member which blocking a part of a reflection light beam coming from the fundus of the eye of the person under measurement and is arranged in an optical path and at approximately conjugate position to a pupil of the eye under measurement so that change occurs in light amount distribution depending on ocular refractive power, a photodetection unit 9 arranged at approximately conjugate position to the pupil of the eye under measurement and receives photodetection light beam from said photodetection optical system, a storage unit for storing a photodetection signal of said photodetection unit, a control a
    Type: Grant
    Filed: March 1, 2000
    Date of Patent: April 17, 2001
    Assignee: Kabushiki Kaisha TOPCON
    Inventors: Masahiro Shibutani, Satoru Niimura