Projector

The invention discloses a projector which comprises a shell, a fan, an air outlet passage, a color wheel, a light source device with a light source, a deflecting plate and a control unit. A position, corresponding to the fan, of the shell is provided with an air inlet. The air outlet passage is used for guiding air sucked in by the fan from the air inlet. The air outlet passage includes a first air outlet passage and a second air outlet passage. The first air outlet passage or the second air outlet passage selectively guide the air sucked in by the fan from the air inlet. The deflecting plate is disposed between the first air outlet passage and the second air outlet passage. The deflecting plate has a first state and a second state. The control unit is coupled to the deflecting plate to allow the deflecting plate to be selectively in the first state or the second state. During a dust removing mode, the light source is closed, the control unit allows the deflecting plate to be in the second state, and the air sucked by the fan from the air inlet reaches the color wheel through the second air outlet passage so as to remove the dust of the color wheel.