Propper Manufacturing Co., Ltd.

Heine Optotechnik Gmbh & Co Kg

Werner E Erfurt

Helmut A Heine

Irving A Speelman

An endoscope includes a light conducting tube having an interior coating of a material having a lower index of refraction than the material of the tube so as to maintain total internal reflection in the light conducting material of the tube, the inner surface of the interior coating being prepared in such a way that unwanted light is prevented from entering the viewing passage.

Endoscope

An endoscope includes a light conducting outer tube and a light absorbing inner tube, with the inner tube being located concentric with the outer tube and being spaced a distance radially inwardly from the outer tube so as to maintain total internal reflection in the light conducting material of the outer tube.

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Herrsching, Germany

Werner E Erfurt