Patent ID: 6986582
Filing Date: 2006-01-17
Classification: G03G

Abstract:
1. A projector, comprising: plural optical modulation systems that modulate plural color lights with respect to each color light according to image information to form optical images; each of said optical modulation systems further including an optical modulation device, an entrance side optical conversion element disposed on a luminous flux entrance side of the optical modulation device, and an exit side optical conversion element disposed on a luminous flux exit side of said optical modulation device; a color composition optical system that combines the optical images modulated in the respective optical modulation systems; a projection optical system that magnifies projection of the composite optical image, and that introduces cooling air to said optical modulation systems; and a duct having plural air guide paths through which cooling air passes, entrance side discharge openings that discharge cooling air to the luminous flux entrance sides of said optical modulation devices, and/or exit side discharge openings that discharge cooling air to the luminous flux exit sides of said optical modulation devices, which are formed in these air guide paths, the luminous flux entrance side and the luminous flux exit side of at least one of said plural optical modulation systems being set as a target of independent cooling, and said entrance side discharge opening and said exit side discharge opening with respect to the target of independent cooling being formed in different air guide paths, and the cooling air is sent to the luminous flux exit side by an exit side cooling fan and is sent to the luminous flux entrance side by an entrance side cooling fan.