Lighting optical system

Abstract

A lighting optical system 100 having: a light source 101 for emitted a light; a reflector 102 for reflecting the emitted light; a first integrator lens unit 103 disposed at a place where a surface thereof crosses an optical axis of the reflected light, the first integrator lens unit 103 having a plurality of micro lenses 109 arranged in a matrix, the first integrator lens unit 103 dividing at least the reflected light into a plurality of lights corresponding to the micro lenses 109 respectively, an area of two micro lenses 109A and 109B disposed at a center portion of the first integrator lens unit 103 being larger than an area of any one of the micro lenses 109 disposed in the first integrator lens unit 103 other than said at least one; and a second integrator lens unit 104 disposed at a place where a surface thereof crosses an optical axis of each of the divided lights, the second integrator lens unit 104 having a plurality of micro lenses arranged in a matrix, the second integrator lens unit 104 for condensing the divided lights so that the condensed lights are irradiated into a display panel 106.