Patent ID: 6036343
Filing Date: 2000-03-14
Classification: A61B,G02B

Abstract:
An illumination system for endoscopes, comprising:a light source device having an arc discharge lamp and a light source optical system;a light guide cable; anda rigid endoscope provided with a light guide on a scope side and an objective optical system, using lenses as a relay optical system,said light source optical system projecting a light-emitting section of said arc discharge lamp on an entrance face of said light guide cable at a magnification of approximately 1.times., and said light guide cable satisfying the following conditions:0.25.times.Mg1.sup.1/2 <DL/DS<0.5.times.Mg1.sup.1/20.8<Mg1.times.(DC/DL)<1.2where DS is an outside diameter of a scope, DC is a diameter of said light guide cable, DL is a diameter of said light guide on the scope side, and Mg1 is a projection magnification of an optical element interposed between said light guide cable and said light guide on the scope side.