Patent ID: 7922343

Claim:
A lens-shifting device for a projector having a lens, the lens-shifting device comprising: a base; a first fixing rod, fixed on one side of the base; a second fixing rod, fixed on another side of the base; a sliding plate, slidably mounted on the first fixing rod and the second fixing rod, wherein the lens is fixed on the sliding plate, and one side of the sliding plate has a rack; a first gear set, having a first gear and a worm gear co-axial with the first gear, wherein the first fixing rod passes through the first gear set such that the first gear and the worm gear are able to rotate relative to the first fixing rod; and a second gear set, having a worm wheel and a second gear co-axial with the worm wheel and disposed between the first fixing rod and the rack, wherein the worm gear is used for driving the worm wheel and the second gear is used for driving the rack such that the sliding plate is able to move relative to the first fixing rod and the second fixing rod.