Patent ID: 8246179

Claim:
A projector comprising: a projector body comprising a front panel, a bottom connected to a bottom of the front panel, and two sidewalls connected to opposite ends of the front panel, the front panel defining a first though hole, the bottom defining two second through holes; a lens module rotatably mounted between the sidewalls of the projector body, the lens module comprising a lens extending out of the projector body through the first through hole of the projector body, and a connecting portion extending from the lens module opposite to the lens; and a gear module comprises a first gear and a second gear, the first and second gears mounted on a first screw pole and a second screw pole respectively and mesh with each other, wherein and the first screw pole is operable to extend through the one of the two second through holes, and the second screw pole is extended into the other one of the two second through holes of the projector body; the first screw pole is rotatably connected to the connecting portion, wherein the first and second screw poles moves reversely to adjust a height of the lens and keep an angle of the lens substantially constant, in response to the second screw pole being rotated.