Patent ID: 7159987
Filing Date: 2007-01-09
Classification: G03B,H04N

Abstract:
1. A lighting device comprising: a light source device that includes first and second light sources that emit first and second illumination lights, respectively, each of which has a peak wavelength different from each other; a wave combining unit that combines the first and the second illumination lights when the first and the second illumination lights are incident on the wave combining unit, and emits illumination lights combined; and a polarization converter that converts the second illumination light to a linearly polarized light in a predetermined direction to allow the second illumination light to enter the wave combining unit, wherein the wave combining unit is a light combining element that uses transmission and reflection of light, and a peak wavelength of the second illumination light is between a first edge wavelength of transmission or reflection, by the light combining element, of the linearly polarized light in the predetermined direction and a second edge wavelength of transmission or reflection, by the light combining element, of a linearly polarized light in a direction perpendicular to the predetermined direction.