Patent ID: 6086531
Filing Date: 2000-07-11
Classification: A61B

Abstract:
A light source device for endoscopes, comprising:a light source for emitting white light containing components of light belonging to a visible region and wavelength bands other than the visible region;a condenser optical system constructed and arranged to concentrate light from said light source from a source side to an illumination side;a light guide disposed on said illumination side of said condenser optical system so as to receive concentrated light;a rotary color separating filter having a first position whereby said rotary color separating filter is disposed in an optical path of light from said light source; andan infrared cutoff filter disposed in said optical path to block light in an infrared region of wavelength bands of the white light,wherein said light source device includes a first arrangement in which said rotary color separating filter is a first interference filter in said first position and said infrared cutoff filter is a second interference filter, said first and second interference filters each having a transparent base plate and an interference film applied to said transparent base plate and transmitting light having wavelengths of at least 1100 nm therethrough.