Patent ID: 7073911

Claim:
A projector, including: an illuminating optical system that emits illumination light; a color separating optical system that separates the illumination light emitted from the illuminating optical system, into a plurality of colored lights; a plurality of liquid-crystal display devices that modulate the colored lights separated by the color separating optical system, respectively, so as to form images; and a color synthesizing optical device that synthesizes the images modulated by the plurality of liquid-crystal display devices; the projector further comprising: a plurality of entrance-side polarizer plates that are disposed on light entrance sides of said plurality of liquid-crystal display devices; a plurality of exit-side polarizer plates that are disposed on light exit sides of said plurality of liquid-crystal display devices; a plurality of entrance-side heat conduction plates that are disposed on light entrance side faces of said color synthesizing optical device, and on which said plurality of exit-side polarizer plates are disposed, respectively; and a first heat conduction member that is joined with the entrance-side heat conduction plate where the exit-side polarizer plate generating a largest quantity of heat among said plurality of exit-side polarizer plates is disposed; said entrance-side heat conduction plate joined to said first heat conduction member being thermally insulated from other entrance-side heat conduction plates; and heat of said exit-side polarizer plate generating the largest quantity of heat being radiated through said first heat conduction member.