Patent ID: 8018668

Claim:
A lens module comprising: a barrel comprising a first cylindrical part and a first threaded part connected to the first cylindrical part in an order from an image side to an object side, the first threaded part comprising a plurality of external threads, the barrel further comprising a bottom surface facing the image side; a holder comprising a second cylindrical part and a second threaded part connected to the second cylindrical part in an order from the image side to the object side, the second threaded part comprising a plurality of internal threads, the second cylindrical part comprising a collar protruding from the inner cylindrical surface, the collar comprising a top surface facing the object side, the barrel being coupled to the holder through clearance fit engagement between the internal threads and the external threads; and an elastic member comprising a ring-shaped part and a plurality of elongated spring tabs stamped out from the ring-shaped part, one end of each spring tab is connected to the ring-shaped part, and another end of each spring tab is curved in a direction away from the ring-shaped part, thus forming a free end; the elastic member sandwiched between the bottom surface of the barrel and the top surface of the collar, the elastic member being configured for exerting a first elastic force to the barrel and a second elastic force to the holder so that the barrel is secured to the holder.