Patents by Inventor Takaharu Kawada

Takaharu Kawada 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: 4311904
    Abstract: An automatic focus adjusting device comprises an optical system for forming the image of a sample to be examined at the image formation point, a first image sensor disposed at a first position for receiving the light image of the sample and converting it into an electrical signal, a second image sensor disposed at a second position for receiving the light image of the sample and converting it into an electrical signal, signal processing systems for processing the signals from the first and second image sensors, and a servo device for controlling the vertical position of the sample relative to the image forming optical system.
    Type: Grant
    Filed: December 4, 1979
    Date of Patent: January 19, 1982
    Assignee: Nippon Kogaku K.K.
    Inventors: Masashi Okada, Yuji Akiyama, Takaharu Kawada, Atsushi Kawahara