Patent ID: 7249857

Claim:
A device for fastening an integration rod of a projection optical system onto a housing of the projection optical system, said device comprising: a frame having a first top wall, a first side wall perpendicular to the first top wall, a second side wall opposite to the first side wall, a front edge, a back edge, a first hole formed on the first top wall, and a second hole formed on the second side wall, the front edge of the frame being mounted onto the housing of the projection optical system; a sheath disposed in the frame and having a second top wall, a bottom wall opposite to the second top wall, a third side wall perpendicular to the second top wall, a fourth side wall opposite to the third side wall, a front opening, a back opening, and a third hole formed on the top wall, the third hole facing the first hole, the integration rod being inserted into the sheath; a first spring disposed between the integration rod and the bottom wall of the sheath; a second spring disposed between the third side wall and the first side wall; a first adjustable screw inserted through the first hole and the third hole to push forward the integration rod such that the first spring is compressed, wherein the vertical position of the integration rod relative to an inner wall of the housing is adjusted by adjusting the first adjustable screw; and a second adjustable screw inserted through the second hole to push forward the fourth side of the sheath such that the second spring is compressed, wherein the horizontal position of the integration rod relative to the inner wall is adjusted by adjusting the second adjustable screw.