Patent ID: 7837335

Claim:
A projector, comprising: a lamp; a fan for dissipating heat generated by the lamp; a housing receiving the lamp and the fan therein, the housing comprising a top cover, a sidewall connected to the top cover, and a bottom cover connected to the sidewall, the sidewall defining an air outlet therein, the fan facing toward the air outlet, the top cover defining an elongated through opening therein, and the bottom cover defining a plurality of holes therein; a plurality of blades disposed between the top cover and the bottom cover, each of the blades comprising a body arranged at the air outlet, a first shaft extending from a bottom side of the body and rotatably engaged in the respectively holes in the bottom cover, and a second shaft extending from a top side of the body into the through opening, an axis of the first shaft being spaced form and parallel with that of the second shaft; and an elongated-slider covering the through opening of the top cover and defining a plurality of guide slots for engagingly receiving the respective second shafts therein.