Patent ID: 8491133

Claim:
A projection apparatus including a converging optical system for guiding light generated by a light source section, and a projection optical system for modulating light, incident thereon from the converging optical system, with an external signal and projecting an image generated by the modulation on a screen in an enlarged manner, the projection apparatus comprising: a plurality of light source sections each having a reflector and a light source that is a discharge lamp, and being in a positional relationship wherein the center axes of the reflectors are orthogonal to each other and all lie in the same plane in which the optical axis of the converging optical system lies, and wherein at least one reflector center axis is orthogonal to the optical axis of the projection optical system; interchange means for interchanging that light source section, of the plurality of light source sections, whose reflector central axis is perpendicular to the direction of gravity, with another of the plurality of light source sections, by rotating a base to which the plurality of light source sections are fixed, about a rotational axis of the base, the base rotational axis lying in the same plane in which the reflector central axes lie; and reflection means for guiding, to the converging optical system, light from that light source section whose reflector center axis is perpendicular to the direction of gravity.