Patents by Inventor Naoki Isogai

Naoki Isogai 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: 5347331
    Abstract: Ophthalmic photographing apparatus for photographing an anterior part of examinee's eye provides an alignment optical system including a reflection image forming device for forming an image reflected on the cornea of the examinee's eye, an observation optical system for observing image of the anterior part of the examinee's eye, comprising an alignment reticle, and a photographing optical system for photographing the anterior part of the examinee's eye. The picture image data of the anterior part of the eye photographed with the photographing optical system is memorized by a picture image data memory, and an alignment deviation is detected by operating the memorized picture image signal to detect a designated part and by finding a dislocation distance of the designated part from a reference position, and an analyzing position of the image is corrected on the basis of the alignment deviation and the picture image of the anterior eye is analyzed.
    Type: Grant
    Filed: June 11, 1993
    Date of Patent: September 13, 1994
    Assignee: Nidek Co., Ltd.
    Inventors: Naoki Isogai, Hirohiko Hanaki
  • Patent number: 5341180
    Abstract: Ophthalmic photographing an image of an eye to be examined comprises: frame memory for memorizing the image data of the photographed eye, light detecting device for detecting an amount of the light emitted from a light source for photographing, correcting device for correcting a density of the image data memorized in the frame memory by comparing the amount of the light detected by the light detecting device with predetermined amount of reference light. Therefore the ophthalmic photographing apparatus can display the image having a constant density, even though the amount of the light emitted from the light source for photographing changes.
    Type: Grant
    Filed: June 22, 1992
    Date of Patent: August 23, 1994
    Assignee: Nidek Co., Ltd.
    Inventors: Naoki Isogai, Kenya Ozaki