Patent ID: 6482150
Filing Date: 2002-11-19
Classification: A61B,G02B

Abstract:
An optical system for a light source device which supplies both visible light to illuminate a subject and ultraviolet light to excite the subject to cause autoflorescence to a proximal end face of a light guide of a video endoscope, said video endoscope having the light guide for guiding the light to the subject, an objective optical system for forming an image of said subject, and an image pickup device for picking up said image, said optical system comprising:a condenser lens for converging a light beam onto the proximal end face of said light guide; a visible light source that emits a first collimated light beam having wavelengths in a visible region and is arranged so that said first collimated light beam enters said condenser lens; an ultraviolet light source that emits a second collimated light beam having a wavelength in an ultraviolet region and is arranged so that said second collimated light beam orthogonally intersects said first collimated light beam; and a UV reflection filter arranged at an angle of 45 degrees to both said first collimated light beam and said second collimated light beam at a position where the first and second collimated light beams intersect, said UV reflection filter transmitting said first collimated light beam, while reflecting said second collimated light beam toward said condenser lens.