Patent ID: 7631973

Claim:
A projector comprising: an image projection device including, a light source device, a optical modulation device that modulates a light beam emitted from the light source device in accordance with image information, and an projection optical device that projects enlarged projection of the light beam modulated by the optical modulation device disposed in a substantially L-shape sequentially from one end to the other end; an exterior chassis accommodating the image projection device, and provided with an air outlet for discharging inside air to the outside formed on an end face on the side of direction of projection; and a ventilation device configured to block leakage light and to insulate sound of the projector and to discharge air inside the exterior chassis to the outside and includes an axial fan provided with a suction port for sucking air and a discharge port for discharging the sucked air, and disposed in an area inside the exterior chassis and surrounded by the substantially L-shape of the image projection device and adjacent to the light source device so that a discharging direction of air from the discharge port is set towards the projection optical device, and the suction port and the discharge port are set at a predetermined angle with a plane perpendicular to the direction of projection of the projection optical device, and an air outlet duct that is provided with a vertical wall substantially perpendicular to the discharging direction of the air from the discharge port of the axial fan to reflect leakage light and to insulate sound of the light source device internally, and bends the air discharged from the discharge port by the vertical wall at an angle of substantially ninety degrees towards a side receding from the projection optical device to lead to the air outlet of the exterior chassis.