Patent ID: 8733940
Filing Date: 2014-05-27
Classification: G03B

Abstract:
1. A light source device comprising: a solid-state light source unit that comprises a plurality of solid-state light sources emitting blue color light and a condensing lens; a dichroic mirror that polarization separates a color light from the solid-state light source unit into a first polarization component and a second polarization component and that combines the blue color light with green and red color lights; a fluorescence emission plate that is excited with the first polarization component so as to emit green and red component fluorescence and make the lights enter the dichroic mirror; a first retardation plate that converts the second polarization component into a circularly polarized light; and a reflection plate that reflects a light that passed through the first retardation plate and makes the light enter again the first retardation plate, thereby combining the color light from the fluorescence emission plate and the color light that has passed again through the first retardation plate at the dichroic mirror so as to emit a white color light, wherein a second retardation plate is arranged between the solid-state light source unit and the dichroic mirror so as to convert the polarization direction of the light from the solid-state light source unit and to control the ratio of lights of p-polarization component and s-polarization component entering the dichroic mirror.