LIGHT SOURCE UNIT AND PROJECTION DEVICE

摘要

This light source unit, which irradiates a liquid crystal panel (17) with light, comprises light sources (12), aspherical plano-convex lenses (13) and a Fresnel lens (14) for collimating light from the light sources (12), and a polarization conversion element (16) for aligning a polarization direction with a specified direction and enabling emission from an emission surface So without blocking any direction of polarization of light coming from an incident surface Si. The prescribed direction is a direction in which the liquid crystal panel (17) transmits light. The amount of light lost is thereby reduced in light emitted from the light sources (12) and transmitted through the liquid crystal panel.