Patent ID: 7639939

Claim:
A lens module comprising: a base; a drive unit mounted to said base; a speed reduction unit mounted to said base and driven rotatably by said drive unit; an outer barrel mounted to said base and having a barrel wall that surrounds an axis, that defines a receiving space, and that has an inner wall surface formed with an internally threaded portion; and a lens unit including a lens barrel that defines a chamber, and at least one lens disposed in said lens barrel, said lens barrel having an externally threaded portion that extends into said outer barrel to engage threadedly with said internally threaded portion of said barrel wall, and a driven portion driven rotatably by said speed reduction unit; wherein said speed reduction unit includes a speed reduction gear system, and said lens barrel has an end wall that extends in radial outward directions relative to the axis, and a surrounding wall that is connected to said end wall and that extends parallel to the axis, said end wall having an outer periphery formed with said driven portion that is in a form of a gear, said surrounding wall having an outer wall surface formed with said externally threaded portion.