Light source device, apparatus for directing cooling air over the light source device, and projector

A projector comprising:

• a light source device;
• a light modulation device configured to modulate light emitted from the light source device;
• and
• a projection device configured to project the light modulated by the light modulation device,
• wherein the light source device includes
• an arc tube which has a light emission portion including a pair of electrodes,
• a reflection mirror configured to reflect light emitted from the light emission portion,
• a tubular body disposed in the front side of the reflection mirror in the light emission direction and surrounding the arc tube,
• a pair of ducts connecting with the tubular body and provided with a first channel and a second channel to guide air, and
• a channel switching mechanism which allows air to flow through the first channel or the second channel,
• wherein:
• the tubular body includes a pair of communicating ports which connect the inside and the outside of the tubular body such that the inside and the outside of the tubular body communicate with each other, and supply airs flowing through the first channel and the second channel toward the light emission portion,
• the pair of the communicating ports are disposed on a virtual line passing through the center line of the arc tube and crossing the vertical direction and the horizontal direction as viewed in a direction along the center line,
• the tubular body includes a column-shaped main body, and hollow portions disposed within the column-shaped main body for each of the communicating ports,
• the pair of communicating ports includes a first communicating port formed in the column-shaped main body and connecting the outside of the tubular body and the inside of the hollow portion such that the outside of the tubular body and the inside of the hollow portion communicate with each other, and a second communicating port formed in the hollow portion to flow an air within the hollow portion toward the light emission portion;
• and
• the second communicating port is formed in a side wall of the hollow portion on the rear side in the light emission direction.