LIGHT TUNNEL, ILLUMINATION OPTICAL SYSTEM, AND IMAGE DISPLAY DEVICE

摘要

PROBLEM TO BE SOLVED: To provide a light tunnel which is formed by putting mirror substrates together into a tube shape and which prevents light traveling through the mirror substrates from reaching a spatial optical modulator from end faces of the mirror substrates on an exit port side of the light tunnel.SOLUTION: A light tunnel is formed by putting a plurality of mirror substrates 10 together into a tube, uses inner walls made up of mirror surfaces of the mirror substrates as reflection surfaces, and has a reflective member 4 provided on each mirror substrate 10 on an exit port side 12 of the light tunnel.