Patent ID: 7180557

Claim:
A liquid-crystal projector for displaying an image on a screen, said liquid-crystal projector comprising: a light source unit including a light source section and an illuminating optical system, said light source section emitting illuminating light, and said illuminating optical system condensing the illuminating light and forming the illuminating light to approximately parallel rays; an image forming unit including an image forming optical system having first to third liquid-crystal displays and a projection lens, said image forming optical system decomposing the illuminating light into three-primary-colors lights, radiating the three-primary-colors lights to said liquid-crystal display corresponding to each color, and composing three-primary-colors image lights from said each liquid-crystal display into full-color image light, and said projection lens projecting the full-color image light to said screen; a light source unit case which contains said light source unit; and an image forming unit case which contains said image forming unit, said light source unit case being attached to said image forming unit case in detachable manner, wherein said light source unit case and said image forming unit case include respectively an opening and an attachment portion being formed near said opening, when combining said attachment portion of said light source unit case with said attachment portion of said image forming unit case, said opening of said light source unit case and the opening of said image forming unit case are faced to each other; and a material which forms said light source unit case and a material which forms said image forming unit case are different, said material which forms said light source unit case having higher heat resistance than said material which forms said image forming unit case.