Patent ID: 8379331

Claim:
A lens module, comprising: a lens barrel having a first end surface, a second end surface opposite to the first end surface and an inside wall connected to the first end surface and the second end surface, wherein the inside wall of the lens barrel forms a cylindrical receiving hole through the first end surface and the second end face, the receiving hole has a center axis, a ring-shaped block formed on the inside wall of the lens barrel protruding from periphery toward the center axis and is coaxial with the receiving hole, the ring-shaped block has a first contact surface adjacent to the first end surface and a second contact surface away from the first end surface, the first contact surface and the second contact surface are truncated cone shape, the radius of cross section of the first contact surface gradually decreases away from the first end surface, and the radius of cross section of the second contact surface gradually decreases away from the direction of the second end surface; a first lens including a first optical portion and a first fixing portion surrounding the first optical portion, wherein the first optical portion has a first optical axis, the first fixing portion has a third contact surface, the third contact surface is a truncated cone shape and coaxial with the first optical axis, the first lens is received into the lens barrel, the radius of cross section of the third contact surface gradually decreases away from the first end surface, and the third contact surface contacts tightly with the first contact surface; and a second lens including a second optical portion and a second fixing portion surrounding the second optical portion, wherein the second optical portion has a second optical axis, the second fixing portion has a fourth contact surface, the fourth contact surface is a truncated cone shape and coaxial with the second optical axis, the second lens is received into the lens barrel, the radius of cross section of the fourth contact surface gradually decreases away from the second end surface, and the fourth contact surface contacts tightly with the second contact surface.