Patent ID: 7382538

Claim:
An optical unit for use in a projection display apparatus, comprising a light source unit, a rectangular optical element, a first optical element, a second optical element, a first optical element moving unit for moving the first optical element, a second optical element moving unit for moving the second optical element, and an image forming device, wherein said rectangular optical element has a first surface disposed between an entrance face and an exit face and a second surface disposed adjacent to said first surface; a light beam emitted from said rectangular optical element is applied to said first optical element; a light beam emitted from said first optical element is applied to said second optical element; said first optical element moving unit has a moving mechanism for moving said first optical element on a first principal plane thereof perpendicular to the optical axis of said first optical element in a direction parallel to a line of intersection between a plane including said first surface of said rectangular optical element and said first principal plane; and said second optical element moving unit has a moving mechanism for moving said second optical element on a second principal plane thereof perpendicular to the optical axis of said second optical element in a direction parallel to a line of intersection between a plane including said second surface of said rectangular optical element and said second principal plane.