Patent ID: 7674165

Claim:
A projector, comprising: a light module; a housing having an inlet and an outlet; a fan disposed in the housing and selectively rotating at a first speed and a second speed to generate air flow in the housing to cool the light module; and a plurality of louvers disposed on the housing to prevent light leakage, having manually adjustable angles and selectively positioned at a first angle and a second angle, wherein the air flow flows out of the housing through the louvers of the outlet when the fan operates, and when the louvers are positioned at the first angle, the fan rotates at the first speed, and when the louvers are at the second angle, the fan rotates at the second speed, and when the first angle is smaller than the second angle, the first speed is higher than the second speed; and wherein the first and second angle are measured between a cross-sectional plane of the outlet and a side of each of the plurality of louvers.