| 摘要 |
<p>A fan device mandatory for cooling a light source lamp since, recently, the rated input power of the light source lamp is increased according to an increase in the brightness thereof to further increase the brightness of a projection screen in a projection type liquid crystal display device, comprising a rotor part (410) drivingly rotated around a specified rotating shaft and a propeller part (420) having propeller blades (421) to (428) disposed on the rotor part (410) so that light beam parallel with the rotating shaft can be substantially shielded, whereby a light shielding member causing an increase in the number of parts can be eliminated.</p> |
