| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a projection video display device which makes improvement in exhaust efficiency and sufficient light shielding of unnecessary light compatible. <P>SOLUTION: A fan device 6 consists of a first fan 6a, a second fan 6b and a motor 6c. The first fan 6a and the second fan 6b are both fixed to one revolving shaft of the motor 6c and rotate one body. The first fan 6a and the second fan 6b consist of four-blade configurations respectively provided with four blades at 90° intervals. The second fan 6b is fixed with the four blades in the state of shifting the blades with respect to the blades of the first fan 6b at 45°. As a result, the first fan 6a and the second fan 6b rotate as one body to shield the light by positioning their blades at the points where the other blades do not exist. <P>COPYRIGHT: (C)2003,JPO |
