| 摘要 |
A transparent material having an air-layer-purging function is disposed between a cover tip portion of a protective cover covering an inserting portion of an endoscope, and a front end face of the inserting portion of the endoscope, so as to keep illumination light from reflecting between an illumination window and the cover tip portion, thus preventing flare and ghost from being generated by this reflected light. Disposed Between a front end face 1A of an inserting portion 1 of the endoscope and a transparent cover 11 constituting a protective cover 10 for the endoscope is a transparent material 15 whose form can conform to the transparent cover 11, illumination window 2, and viewing window 3 without intervening an air layer therebetween, such as deaerated water, cedar oil, jelly-like material, gel-like material, or the like. Consequently, light reflection at the rear end face 11A of the transparent cover 11 and the front end face 2A of the transparent window 2 can be reduced, whereby the loss in quantity of the irradiation light can be decreased. Also, the quantity of the reflected light incident on the viewing window 3 can be lowered, whereby the occurrence of flare and ghost caused thereby can be alleviated.
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