Patent ID: 8287140

Claim:
A projector comprising: a light source; a light valve configured to modulate light emitted from the light source according to image information to form image light; a projection lens that projects the image light formed by the light valve; a support and drive unit configured to support the projection lens such that the projection lens can be replaced, the support and drive unit being further configured to switch between (a) a shift condition for disposing the projection lens in such a position that the projection lens shifts in a first direction within a plane perpendicular to a system optical axis of the entire projector, and (b) a normal condition for disposing the projection lens in such a position that the projection lens lies on the system optical axis; and a control unit configured to determine the type of the projection lens between a shift type designed so as to control a projection direction of a projection image by shifting in the first direction and a non-shift type not designed so as to control the projection direction, the control unit being further configured to control supporting of the support and drive unit according to the determination of the type of the projection lens.