| 摘要 |
There is provided a heat conductive portion for conducting heat generated by an LED light source to cooling liquid at a rear side of each LED light source. Each heat conductive portion is connected one another with a pipe, and the cooling liquid flowing in the pipe is sequentially circulated through each heat conductive portion. A heat generation amount of an LED light source for red light is the smallest, the heat generation amount of an LED light source for green light is the largest, and the heat generation amount of an LED light source for blue light is the middle of the two. The cooling liquid cooled by passing through a radiation fin is firstly supplied to the heat conductive portion for the LED light source for red light, secondly supplied to the heat conductive portion for the LED light source for blue light, and lastly supplied to the heat conductive portion for the LED light source for green light. The cooling liquid discharged from a pump is supplied to the heat conductive portion for the heat conductive portion for the LED light source for green light. Then, the cooling liquid from this heat conductive portion passes through the pipe to be supplied to the radiation fin (radiator).
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