Patent ID: 7489456

Claim:
A lens module comprising: a holder base, said holder base having a top side, a bottom side, two opposite lateral sides, a top flange upwardly extending from the top side, a plurality of vertical through holes arranged in a row and surrounded by said top flange, a plurality of locating holes formed on the top side and disposed at two opposite sides relative to said vertical through holes within an area surrounded by said top flange, a foolproof notch at one end of said top flange, a plurality of mounting portions symmetrically disposed at the two opposite lateral sides for fastening to a circuit board, a plurality of guide tracks symmetrically arranged at the two opposite lateral sides, and a plurality of retaining blocks respectively protruded from the two opposite lateral sides in each of said guide tracks; a lens device, said lens device having a narrow elongated flat lens base positioned in the top side of said holder base within said top flange, said flat lens base having a top surface and a bottom surface, a protruding block extending from one end of said flat lens base and engaged into said foolproof notch of said top flange of said holder base, a plurality of convex portions protruding from the top surface of said flat lens base, a plurality of flat protrusions protruded from the bottom surface of said flat lens base and respectively fitted into the through holes of said holder base, and a plurality of locating pins respectively extended from the bottom surface of said flat lens base and respectively fitted into the locating holes of said holder base; and a top cover capped on said holder base to hold down said lens device, said top cover having a plurality of through holes corresponding to the convex portions of said lens device, a bottom recess, which receives said top flange of said holder base and said lens device within said top flange, and a plurality of retaining lugs downwardly extending from two opposite lateral sides thereof and respectively engaged into said guide tracks of said holder base, said retaining lugs each having a retaining hole respectively forced into engagement with the retaining blocks of said holder base.