| 摘要 |
<P>PROBLEM TO BE SOLVED: To obtain a projection type image display apparatus achieving temperature control of a light source element having a semiconductor laser element array as a light source with simple constitution, thereby always achieving very accurate color reproduction over a long term and keeping the service life of the semiconductor laser element array long in spite of change of ambient temperature and structural change with lapse of time of the light source element itself. <P>SOLUTION: In the projection type image display apparatus which obtains projection light by modulating at least light beams of three primary colors according to image information and compositing them, a light source unit is constituted by arranging a plurality of light source elements constituted by disposing a light source array where a plurality of light source elements are arranged on the same substrate on a heat receiving plate, disposing a temperature detection means on the light source array and disposing an auxiliary cooling means on the heat receiving plate or the light source array hierarchically so that the light beam of each color may be guided to the irradiation surface of a composite prism. <P>COPYRIGHT: (C)2009,JPO&INPIT |
