Patent ID: 7055959

Claim:
A projection display apparatus comprising: a light source; an illumination system for condensing light emitted from the light source into illumination light; a reflection system for bending an optical path of the illumination light; a reflection-type light modulator that is illuminated with the illumination light bent by the reflection system and forms an optical image in accordance with an image signal; a projection system for projecting the optical image formed on the reflection-type light modulator; and a lens element arranged on optical paths of incident light and exit light of the reflection-type light modulator, wherein an optical axis of the illumination system and an optical axis of the projection system are skew lines, the lens element allows an exit pupil of the illumination system to be conjugated substantially with an entrance pupil of the projection system, the entrance pupil is eccentric with respect to the optical axis of the projection system, and the projection system comprises a focus adjusting mechanism that does not rotate around the optical axis of the projection system.