Patent ID: 7433196

Claim:
A card-type electronic apparatus comprising: a printed circuit board assembly (PCBA) including one or more integrated circuits (ICs) mounted on a printed circuit board (PCB), the PCBA having a width defined by opposing side edges of the PCB; a plastic upper cover comprising a plurality of upper sidewalls extending substantially perpendicularly from a top exterior surface of the upper cover, each of the plurality of upper sidewalls including an upper mating feature disposed at lower ends thereof; and a plastic lower cover comprising a plurality of lower mating features and at least two lower sidewalls, the at least two lower sidewalls extending substantially perpendicularly from a bottom exterior surface of the lower cover, the plurality of lower mating features being inboard of the at least two lower sidewalls and disposed on an interior surface of said lower cover, wherein said lower sidewalls are separated by a width that is wider than an external surface-to-external surface distance of said upper sidewalls, whereby when said upper cover is mounted on said lower cover, both said upper sidewalls are disposed between said lower sidewalls with said upper mating features contacting lower mating features, and wherein when the plurality of upper mating features are subsequently ultrasonically welded to the plurality of lower mating features, the upper and lower mating features are melted together along an interior seam located at a base of said lower sidewalls, wherein the upper cover and the lower cover enclose the PCBA, and wherein the width of the PCBA is substantially equal to an interior width separating interior surfaces of the upper side walls, and the PCBA is mounted against an interior surface of the upper cover such that no portion of the lower cover is disposed between outer edges of the PCBA and the upper side walls of the upper cover.