Patent ID: 7998064
Filing Date: 2011-08-16
Classification: A61B,G01N

Abstract:
1. An endoscope insertion portion comprising: a distal end portion; first image pickup means for obtaining a normal light observation image, the first image pickup means being disposed to the distal end portion; second image pickup means for obtaining a fluorescent light observation image, the second image pickup means being disposed to the distal end portion; a first object optical system for condensing photographing light incident on the first image pickup means, the first object optical system being located in the distal end portion; a second object optical system for condensing photographing light incident on the second image pickup means, the second object optical system being located in the distal end portion; and three illumination optical systems for radiating illumination light to a subject, the three illumination optical systems being disposed to the distal end portion, the three illumination optical systems being formed of a first illumination optical system, a second illumination optical system, and a third illumination optical system; and air/water feeding nozzle for spouting out liquid or gas to outer surfaces of the first and second object optical systems and the first and the third illumination optical systems, the air/water feeding nozzle being disposed to the distal end portion, wherein, at the distal end portion, the first and second illumination optical systems are located in a manner sandwiching the first object optical system, and the first and third illumination optical systems are located in a manner sandwiching the second object optical system, and the first and third illumination optical systems sandwiching the second object optical system are located so that outer surfaces of the first and third illumination optical systems are positioned in a spouting area of the liquid or gas from the air/water feeding nozzle.