Abstract: A cooling apparatus and a method for controlling the same are disclosed. The cooling apparatus is adapted to cool a system in which a heat source generating heat is arranged. The cooling apparatus includes an air stream forming unit which cools the heat source to a certain temperature, a sensing unit which includes a supplied-air temperature sensor for sensing a temperature of air supplied into the system, and a discharged-air temperature sensor for sensing a temperature of air discharged out of the system, an altitude detecting unit which detects an altitude of the system, based on the sensed supplied-air temperature and the sensed discharged-air temperature, and a cooling controller which controls the air stream forming unit, based on the detected altitude.

Abstract: A cooling system of a thin projector, and a method for controlling the same are disclosed. The system comprises a heat source 1 in a housing, first and second suction ports formed at side and lower surfaces of the housing, respectively, a discharge port formed at an upper surface of the housing, first and second air stream forming units 2 and 3 to form first and second air stream along which air induced from the first and second suction ports is guided to the discharge port while cooling the heat source, respectively, a sensor unit to detect a temperature of suction air induced from the first and second suction ports and a temperature of discharge air discharged from the discharge port, and a controller 6 to control the first and second air stream forming units 2 and 3 using the temperatures of the suction and discharge air.

Abstract: A projection lens unit and a thin projector using the same are disclosed. The projection lens unit includes a plurality of lens sets for emitting light carrying an image, and a reflector arranged between adjacent ones of the lens sets or at a downstream end of the lens sets, and adapted to change a direction of light incident on the reflector.

Abstract: A thin projector is disclosed. The thin projector includes a housing having an upright panel shape, an illumination unit arranged in the interior of the housing, the illumination unit generating light and emitting the generated light, a micro device arranged in the interior of the housing, the micro device receiving the light from the illumination unit and producing an image using the received light, and a projection lens unit arranged in the interior of the housing, the projection lens unit including an emission unit adapted to externally emit the image produced by the micro device and arranged to be externally exposed through a front side of the housing.