Patent ID: 8647263
Filing Date: 2014-02-11
Classification: A61B

Abstract:
1. An illumination optical system for endoscopes in combination with a light beam transmission means of an endoscope, said light beam transmission means of an endoscope being formed of light guide fibers that transmit light emitted from a light source, said illumination optical system for endoscopes positioned opposite a light beam exit end of the light beam transmission means of an endoscope for transmitting light emitted from the light source and characterized by comprising, as viewed from said light beam exit end, a lens group having positive power and an optical member subsequent thereto which has a spherical surface that functions as a lens, has a radius of curvature R, and satisfies the following condition: where R is a radius of curvature of the spherical surface in mm, and S is a surface area of the spherical surface, in mm