VORRICHTUNG ZUR WÄRMEÜBERTRAGUNG

摘要

A xenon arc lamp (10, 12) used as a high intensity light source for a liquid crystal light valve projector includes a cold mirror (16) that reflects visible reading light (18a, 18b) to the liquid crystal light valve and transmits infrared light to a heat transfer unit (20) that is arranged to remove heat from the projector. The heat transfer unit (20), positioned adjacent the back of the cold mirror, is formed by a group of wire grids (50,52,54,56) that are mutually parallel and spaced close to one another with the openings of the grids displaced so as to be out of alignment with one another from grid to grid. The grids are mounted in a housing (28,30,34) which includes a heat reflective backup plate (62) on the far side of the grids and a cooling gas is caused to flow through the housing and over the grids to remove the heat transferred to the grid from the infrared radiation.