Patent ID: 8733948

Claim:
A light source unit comprising: a first light source comprising a light emitting diode or a solid-state light emitting device which emits light of a predetermined wavelength band, a second light source comprising a light emitting diode or a solid-state light emitting device which emits excitation light, a first light combining device which combines light emitted from the first light source and light emitted from the second light source such that their optical axes coincide with each other, wherein the first light combining device is disposed at a position where an optical axis of the first light source and an optical axis of the second light source intersect each other, and a third light source which transmits the light emitted from the first light source and which emits light of a same wavelength band as the first light source using the light emitted from the second light source as excitation energy, wherein the third light source is disposed on an optical axis of a pencil of light output by the first light combining device so that the pencil of light is shone onto the third light source.