Patents by Inventor Ken-Ichi Nakahashi

Ken-Ichi Nakahashi 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: 4562344
    Abstract: An endoscope provided with a light receiving device on the eyepiece side in respect of an image guide and with a driving means for moving an objective lens near an eyepiece, to make the whole endoscope slim and to make it simple in formation despite its being provided with an automatic focus detecting mechanism.
    Type: Grant
    Filed: December 1, 1982
    Date of Patent: December 31, 1985
    Assignee: Olympus Optical Co., Ltd.
    Inventors: Shin-ichi Mihara, Toshihiro Imai, Ken-ichi Nakahashi, Youichi Iba, Masaki Imaizumi, Akio Taira
  • Patent number: 4516840
    Abstract: An in-focus detector for a binocular stereomicroscope having a pair of left- and right-hand observation optics includes a pair of beam splitters, each disposed intermediate the objective lens and the eyepieces of the respective observation optics. The first one of the beam splitters introduces the optical image of a mark into one of the observation optics, which then focuses it on an object being observed. The image is then reflected by the object and passes through the other observation optics to be reflected by the second beam splitter so as to be directed externally of the observation optics and focussed on a photoelectric transducer element, which is effective to detect an in-focus condition.
    Type: Grant
    Filed: June 25, 1982
    Date of Patent: May 14, 1985
    Assignee: Olympus Optical Co., Ltd.
    Inventors: Ken-ichi Nakahashi, Shin-ichi Mihara
  • Patent number: 4509838
    Abstract: An optical system for retinal cameras wherein the distance between an eye to be inspected and an inspector is made short to improve the operatability and to make it easy to handle the eye to be inspected.
    Type: Grant
    Filed: January 31, 1984
    Date of Patent: April 9, 1985
    Assignee: Olympus Optical Co., Ltd.
    Inventors: Youich Iba, Ken-ichi Nakahashi, Masaki Matsubara
  • Patent number: 4439023
    Abstract: A compactly designable optical system for ophthalmological instruments comprising an illumination system so adapted as to illuminate a fundus with rays having passed through a ring slit and been focused on the cornea of an eyeball to be examined, and an observation/photographing system so adapted as to permit observing and photographing an image of said eyeball with a small reflector mirror arranged in said illumination system so as to be inclined with regard to the optical axis thereof and a relay lens for focusing the rays which are reflected by the fundus, passing through said objective lens and reflected by said small reflector mirror.
    Type: Grant
    Filed: May 4, 1981
    Date of Patent: March 27, 1984
    Assignee: Olympus Optical Co., Ltd.
    Inventors: Youich Iba, Ken-ichi Nakahashi, Masaki Matsubara
  • Patent number: 4403837
    Abstract: An objective for endoscopes comprising a first, second, third, fourth and fifth lens components in which the first lens component is a negative meniscus lens having a convex surface on the object side, the second lens component is a positive meniscus lens having a concave surface on the object side, the third lens component is a positive lens, the fourth lens component is a cemented lens consisting of a positive lens element and a negative lens element cemented to said positive lens element, and the fifth lens component is a positive lens, the objective for endoscopes having a very wide angle of view and well corrected aberrations.
    Type: Grant
    Filed: October 7, 1981
    Date of Patent: September 13, 1983
    Assignee: Olympus Optical Co., Ltd.
    Inventor: Ken-ichi Nakahashi
  • Patent number: 4354734
    Abstract: An objective optical system for endoscopes comprising an objective and image guide for transmitting an image of an object formed by the objective, the objective comprising a first lens component consisting of a cover glass and plano-covex lens, which are cemented together by arranging a stop between them, and a second lens component which is a plano-convex lens arranged toward the object side, the objective optical system for endoscopes enabling to observe with a wide field angle.
    Type: Grant
    Filed: August 1, 1980
    Date of Patent: October 19, 1982
    Assignee: Olympus Optical Co., Ltd.
    Inventor: Ken-ichi Nakahashi
  • Patent number: 4340811
    Abstract: A focusing method for use in an optical system and a focusing apparatus used therefor employ an illumination unit. The method comprises effecting photometry of light reflected from an object which is to be observed and which is illuminated only by light from the illumination unit, and causing a movement of the optical system to focus it, the magnitude of the movement being determined by the amount of light measured by the photometric operation.
    Type: Grant
    Filed: March 3, 1980
    Date of Patent: July 20, 1982
    Assignee: Olympus Optical Co., Ltd.
    Inventors: Nobuo Yamashita, Ken-ichi Nakahashi
  • Patent number: 4300812
    Abstract: An optical system for endoscopes comprising an objective lens, a plural number of relay lenses for consecutively transferring the image formed with said objective lens and an eyepiece. In said optical system, the whole or portion of one of said relay lenses can be displaced along the optical axis to vary magnification level of said optical system.
    Type: Grant
    Filed: May 8, 1979
    Date of Patent: November 17, 1981
    Assignee: Olympus Optical Co., Ltd.
    Inventor: Ken-ichi Nakahashi
  • Patent number: 4279476
    Abstract: A plan achromat objective lens system designed for a magnification level on the order of 40.times. for use with microscopes comprising a first negative meniscus lens component, a second positive lens component, a third positive cemented doublet and a fourth positive cemented doublet, said objective lens system being so adapted as to correct various aberrations favorably with the small number of lens components.
    Type: Grant
    Filed: December 7, 1979
    Date of Patent: July 21, 1981
    Assignee: Olympus Optical Co., Ltd.
    Inventor: Ken-ichi Nakahashi
  • Patent number: 4056310
    Abstract: A method and device for ophthalmoscopy for observing fundus oculi by a binocular ophthalmoscope through a contact lens arranged in contact with an eyeball to be observed, said method and device for ophthalmoscopy enabling to observe the fundus by a multiplied erect image from a position distant from the examinee.
    Type: Grant
    Filed: February 13, 1976
    Date of Patent: November 1, 1977
    Assignee: Olympus Optical Co., Ltd.
    Inventors: Hiroyuki Shimizu, Kouji Inaba, Ken-Ichi Nakahashi