Patent ID: 9052581
Filing Date: 2015-06-09
Classification: F21V,G03B,H01J

Abstract:
1. A light source device comprising: an arc tube that has a light emission portion containing a pair of electrodes; a cooling channel that has a downstream part branched into a first channel and a second channel, and configured to guide air toward the light emission portion via the first channel or the second channel; a rotational member disposed within the cooling channel in such a manner as to be rotatable around a rotation shaft by gravity, and configured to switch the cooling channel to the first channel when the light source device is set in a first position, and to switch the cooling channel to the second channel when the light source device is set in a second position different from the first position; and a duct that forms a part of the cooling channel and introduces air toward a first introduction port; wherein the rotational member is shaped such that the width of the rotational member in the direction parallel to the rotation shaft decreases in a direction from an end disposed away from the rotation shaft toward the rotation shaft, the first introduction port is disposed on a side opposite a light emission side of the rotation shaft, and the air that flows through the cooling channel is introduced toward the first introduction port when the rotational member is in the first position and when the rotational member is in the second position.