Light source device using optical fibers

摘要

A light source (1) device using an optical fiber (3) in which the light emitted from a filament lamp is incident on the end face (3a) of the optical fiber (3) with high efficiency is achieved by using a reflector (2) which is an ellipsoid of revolution having first (F1) and second (F2) focal points, the filament coil (11) of the lamp being located at the first (F1) focal point and the end face (3a) of the optical fiber (3) being located at a second focal point (F2). Furthermore, the area of the filament (11) of the filament lamp A (mm<2>), an area of the incidence face of the optical fiber (3) B (mm<2>), and a value of a focal length C, set as a distance between an apex (T) of the reflector (2) and the first focal point (F1) divided by a distance between the apex (T) of the reflector (2) and the second focal point (F2) have a relationship with respect to each other such that a constant alpha defined by the relationship: <MATH> has a value that is less than or equal to 20. <IMAGE>