Patent ID: 7301265

Claim:
A projector comprising: a light source unit; a uniformly illuminating optical system to uniformly illuminate a illumination intensity on a surface of an illumination area from light emitted from the light source unit; a optical device to modulate light from the uniformly illuminating optical system according to image information; a projecting optical system to project light modulated by the optical device, and an optical component enclosure having a preset reference axis, the uniformly illuminating optical system being positionally adjusted and stored in the optical component enclosure; the light source unit, comprising: an arc tube having a light emitting section, electrodes and sealed sections provided on both sides of the light emitting section, discharging emission being performed between the electrode sections; an oval reflector having a reflecting surface of a substantially elliptical shape to emit a luminous flux radiated from the arc tube in a certain direction; a collimator lens to make parallel convergent light from the elliptic reflector; a lamp housing to set a direction of an optical axis of the elliptic reflector, the lamp housing including a lens positioning member in which the collimator lens is fixed, the collimator lens being positioned and fixed to the lamp housing by the lens positioning member in a state in which the optical axis of the elliptic reflector and an optical axis of the collimator lens are aligned.