Patent ID: 8757818

Claim:
A projection display apparatus comprising: a light source unit; and a projection unit, said light source unit including: a plurality of solid state light sources, and a light combining and concentrating section for combining light beams from the respective solid state light sources together and then concentrating the combined light beam by using a predetermined light condensing lens to provide a concentrated output light beam, said light combining and concentrating section including: a light combining section for combining the light beams from the respective solid state light sources together, said plurality of light sources and said light combining section being integrated together within said light source unit, a light condensing lens housing in which said predetermined light condensing lens is housed, said projection unit including: an optical modulator for modulating said concentrated output light beam, based on information of an input signal, and a projection optical section for projecting the light beam from said optical modulator in the form of an image onto a predetermined screen, wherein said light source unit and said projection unit are configured to be separable from and connectable to each other, said light source unit and said projection unit include a light source unit alignment mechanism and a projection unit alignment mechanism, respectively, capable of performing alignment so that an optical axis of said predetermined light condensing lens and an optical axis for an incident light beam set in said projection unit coincide with each other when said light source unit and said projection unit are coupled to each other, and said light source alignment mechanism includes a housing holding mechanism for coupling said light combining section to said light condensing lens housing, said housing holding mechanism having an elastic property for holding said light condensing lens housing slightly movable in relation to said light combining section.