Study of Efficient-Cooling Closed Light-Source for Projectors

Abstract

Generally, high-pressure mercury lamps are used as the light source for projectors. This comparatively large-size and low luminosity light source is sealed by a reflector and a front glass, similar to that used as the light source for projection TVs. However, the light source used for front projectors, which needs to be small and to have high luminosity, is not sealed very well. When a luminescence pipe explodes, it is difficult to prevent a non-sealed light source from scattering mercury and shattered glass inside the projector. We studied a small, sealed, and highly luminos light source for projectors. About 130W is the input limit for a sealed light source for projectors because of the problem of luminescence pipe cooling. However, we found a way to build a high luminosity, small-size, and sealed light source by developing a reflector with a four layer structure.