PROJECTION DISPLAY DEVICE

摘要

This projection display device comprises: a plurality of lamps (6), each lamp having an arc tube (1) with a luminescent point (1') that emits light, a concave reflective mirror (4) that causes light to reflect, and an exit surface through which light is emitted; a light pipe (7) that has a hollow cylindrical shape, whereat light entering from an entrance opening thereof is reflected by an inner surface thereof and emitted from an exit opening thereof; and reflective elements (8) that are provided to correspond respectively with the plurality of lamps (6) and reflect light from each lamp (6) toward the entrance opening of the light pipe (7). Each reflective mirror (4) is formed of a rotating elliptical mirror (2) and a rotating parabolic mirror (3) that share an axis of rotation. A first focal point of the rotating elliptical mirror (2) and a focal point of the rotating parabolic mirror (3) match the luminescent point (1') of the arc tube (1). The light from the elliptical portions of the lamps (6) is reflected by the reflective elements (8) and enters through the entrance opening of the light pipe (7).