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Distal end part of endoscope

  • US 5,951,464 A
  • Filed: 04/19/1995
  • Issued: 09/14/1999
  • Est. Priority Date: 06/05/1991
  • Status: Expired due to Fees
First Claim
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1. A distal end part of an endoscope, comprising:

  • a viewing window for introducing light from an object into an objective optical system having a visual field for forming an observed image;

    an illumination window disposed in a side by side relationship with said viewing window for illuminating said visual field of said objective optical system;

    a continuous transparent cover for covering surfaces of both said illumination and viewing windows; and

    a window glass that is attached to and covers said viewing window, said window glass having a flat front surface and a flat rear surface, said window glass having a diameter large enough so that a virtual image of an outer edge portion of said window glass, which is produced by single reflection from an inner side of an outer surface of said transparent cover, lies outside the visual field of said objective optical system, said illumination window being uncovered by said window glass.

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