An optical fiber of a bundled fiber light source is an optical fiber whose core diameter is uniform but whose emission end cladding diameter is smaller than an incidence end cladding diameter thereof, and a light emission region thereof is made smaller. An angle of luminous flux from this higher luminance...http://www.google.com/patents/US6960035?utm_source=gb-gplus-sharePatent US6960035 - Laser apparatus, exposure head, exposure apparatus, and optical fiber connection method
