JPS6452108A - Optical fiber cable - Google Patents

Abstract

PURPOSE:To prevent heat generation by guiding the laser light of visible and IR light condensed by a 1st optical fiber cable via an aperture to a desired section by means of a 2nd optical fiber cable consisting of an IR optical fiber and glass tube. CONSTITUTION:The CO2 laser light 1 which is IR laser light is condensed by a condenser lens 2 and is entered to the 1st IR optical fiber 3 from which the light is condensed by a condenser lens 4 to the point (a). Neon laser light 5a, etc., which are visible laser light are condensed by a condenser lens 6a, etc., and are entered to a visible optical fiber 7a, etc., from which the light is condensed once by an auxiliary lens 8a, etc., to the point (b) and is condensed by the lens 4 to the point (a). The laser light condensed to the point (a) is entered via the aperture 14 which allows only the passage of the visible light to the 2nd optical fiber 9 and the laser light 5a, etc., are guided by the glass tube 11 contg. the fiber 9. There light rays are respectively condensed by a condenser lens 10 and are projected to the desired section. Since the IR light is entered only to the optical fiber 9, the burn of the glass tube 11, etc., by the heat generation is prevented.