An endoscope includes a hollow tube having a proximal end and a distal end, a window disposed in an aperture of the distal end of the tube, a lens disposed proximate the window in the distal end of the tube and a photodetector disposed proximate the objective lens in the distal end of the tube....http://www.google.fr/patents/US5895350?utm_source=gb-gplus-shareBrevet US5895350 - Electronic endoscope
