| 摘要 |
PROBLEM TO BE SOLVED: To actuate a semiconductor laser element array that is a light source after achieving laser operation set temperature when starting a projection type video display device, thereby shortening an idling time of the device and also protecting the semiconductor laser element array from thermal effect. SOLUTION: A light source unit is constituted by arranging a plurality of light source elements constituted by disposing the semiconductor laser device array where a plurality of semiconductor laser devices are arranged on the same substrate on a heat receiving plate and disposing an electric heater and a temperature detection means (temperature sensor) for the semiconductor laser device array on the heat receiving plate hierarchically so that light beam may be guided to the irradiation surface of a synthetic prism for each of three primary colors. The heat receiving plate of the light source element is connected to a cooling means, and the electric heater and the temperature sensor are connected to a control means. The control means compares temperature detected by the temperature sensor with the predetermined laser operation set temperature, thereby determining the actuation time of the semiconductor laser device array. COPYRIGHT: (C)2009,JPO&INPIT
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