Patent ID: 7121737
Filing Date: 2006-10-17
Classification: G02B,G10C,G10G

Abstract:
1. A light emitting unit comprising: a light emitting device for converting electric power to light; at least one optical fiber having a light input end on which said light is incident; a condenser lens having an optical axis, and provided between said light emitting device and said light input end for condensing said light onto said light input end; a casing formed with a hollow space for keeping said light emitting device, said condenser lens and said light input end at intervals; and a light increaser formed in at least one of said casing, said condenser lens and the inner surface of said casing defining said hollow space for increasing the amount of light incident onto said light input end, said light increaser being a positioning device for disposing said light input end at a certain point on said optical axis, said positioning device having a first positioner for making a center of said light input end aligned with a centerline of said casing, a second positioner for making said optical axis of said condenser unit coincident with said centerline of said casing, and a third positioner for making a centerline of said light emitting device aligned with said optical axis of said condenser unit. said second positioner having an inner surface of said casing defining said through-hole, a shoulder portion formed in said casing in such a manner as to project into said through-hole of said casing and a body of said condenser lens unit held in contact with said shoulder and slidable on said inner surface in such a manner that said optical axis is coincident with said centerline of said casing.