Patent ID: 9348206
Filing Date: 2016-05-24
CPC Classification: F21V,G03B

Claim Text:
1. A light source apparatus comprising: a first light source unit that emits first light; a second light source unit that emits second light; and a light combiner that combines the first light emitted from the first light source unit and the second light emitted from the second light source unit and outputs the combined light, wherein the light combiner has a polarization separation film that transmits light polarized in a first direction and reflects light polarized in a second direction perpendicular to the first direction, the first light is polarized in the first direction, the second light is polarized in the second direction, an angle of incidence θ1 of the first light with respect to the polarization separation film and an angle of incidence θ2 of the second light with respect to the polarization separation film are each greater than 45°, an optical axis of the first light source unit and an optical axis of the second light source unit form an angle smaller than 90°, and wherein expressions (1), (2), and (3) are satisfied as follows: where α represents a maximum efficiency angle that is an angle of incidence with respect to the polarization separation film where polarized light combination efficiency is maximized, the maximum efficiency angle α determined in accordance with a wavelength band of the first light and a wavelength band of the second light, and β is (45°+α)/2.