US Patent 8253839 Lens assembly and camera module having same

A lens assembly includes a first lens and a second lens. The first lens includes an optical axis, and a first engaging face facing toward the optical axis and a first engaging structure formed on the first engaging face. The second lens is used for engagement with and coaxially alignment with the first lens. The second lens includes a second engaging face facing away from the optical axis and a second engaging structure formed on the second engaging face for engagement with the first engaging structure of the first lens. The second lens is rotatable about the axis but non-movable along the optical axis relative to the first lens when the second lens is engaged with the first lens.