Multistage cooling system for projector

A projector having:

• at least a light source unit;
• optical components adapted to decompose a beam of source light from said light source unit into beams of three primary colors (red, green, and blue), modulate said three colored beams based on an image signal received, compose said three modulated beams into a beam of full-color imaging light, and project said imaging light;
• and a power supply unit for supplying electric power to said light source unit and optical components, said projector comprising:
• a first, second, and third fan each provided near said optical components to introduce external air from outside said projector to cool said optical components;
• a fourth, fifth, and sixth fan for discharging internal air of said projector, and wherein:
• said fourth fan adapted to cool said light source unit by blowing into said light source unit the air that has been introduced by said first, second, and third fan and cooled said optical components;
• and
• said fifth and sixth fans adapted to discharge out of said projector the air that has cooled said light source unit and said power supply unit.