Patent ID: 7701651

Claim:
A method for assembling a lens module with a metal shell, including: providing a lens module with a predetermined size; the lens module having metal portions disposed on a central area of the outer surface thereof; providing a first metal plate and a second metal plate; punching the first metal plate to form a bottom casing with a fixed size, the bottom casing comprising a bottom plate, three lateral plates extending upwardly from the edges of the bottom plate, at least two lateral plates having a plurality of first locking portions; inwardly punching each of the lateral plates of the bottom casing to form a protrusion in a predetermined length protruded from a central area of the inner surface thereof; wherein the predetermined length of the protrusion is adjusted according to the size of the lens module; punching the second metal plate to form a top casing, the top casing comprising a top wall, four lateral walls extending down from the edges of the top wall, two of the four lateral walls having a plurality of second locking portions corresponding to the first locking portions; wherein said plurality of first locking portions and said plurality of second locking portions are physically separated and distinct from said protrusion; assembling the lens module with the bottom casing, each of the protrusions of the bottom casing abutting against the metal portions of the lens module for holding the lens module; and assembling the top casing with the bottom casing to form the metal shell, each of the first locking portions of the bottom casing locking each of the second locking portions of the top casing, whereby one of the lens modules with different sizes can be assembled to the top casing and the bottom casing with the fixed size due to the protrusions with the adjustable punching length.