Electricity: conductors and insulators – Anti-inductive structures – Conductor transposition
Reexamination Certificate
1999-07-13
2001-11-06
Reichard, Dean A. (Department: 2831)
Electricity: conductors and insulators
Anti-inductive structures
Conductor transposition
C361S816000, C361S737000
Reexamination Certificate
active
06313400
ABSTRACT:
BACKGROUND OF THE INVENTION
PC and CF cards, which are both herein referred to as data cards, commonly include a circuit board and a housing surrounding the circuit board, with the housing including top and bottom housing halves. Each housing half includes a sheet metal shield with a main wall lying in a horizontal plane and with opposite vertical side walls. A data card kit includes such a housing, which is sold to a data card maker that makes its own circuit board and mounts circuit components thereon, and which assembles the housing around the circuit board assembly. Previously, the housing halves have been joined by welding together side walls of the housing halves and/or by allowing sheet metal tabs with free ends extending from one housing half to hook to the other housing half. Welding equipment, whether for metal or plastic, is costly and requires the assembled housing halves to be moved to a special welding station, while hooking the housing halves together with tabs having free ends results in a housing that is not rigid. A pair of data card housing halves that could be readily assembled around a circuit board to create a data card with a rigid housing that provided a high degree of shielding against EMI (Electromagnetic Interference) would be of value.
SUMMARY OF THE INVENTION
In accordance with one embodiment of the present invention, a data card housing is provided which is easily assembled around a circuit board and which results in a rigid housing that provides good EMI (Electromagnetic Interference) shielding. The housing includes top and bottom housing halves, with each housing half including a sheet metal shield having a horizontal main wall and primarily vertical side walls. The side walls of the shields are formed with dimples that each has a projection at one surface and a recess at the other surface. The housing halves are assembled so that the side walls overlap, with dimples of the overlapped side walls locking to each other. Each dimple is formed by half-punching out an area of a shield side wall, with opposite sides of the dimple merging with the rest of the side wall but with at least the bottom of the dimple cut free of an adjacent area of the shield side wall. As a result, the bottom forms a downwardly-facing surface for locking to the dimple of the other shield.
Each shield half preferably includes front and rear walls, with the front wall shielding opposite sides of the front of the card, which lie beyond a front connector, and with the rear walls shielding much of the rear of the card. Each housing half preferably includes a molded plastic body forming a beam extending along each shield side. Each molded plastic body includes a body portion that extends into a recess of a dimple, or which backs up the dimple.
The novel features of the invention are set forth with particularity in the appended claims. The invention will be best understood from the following description when read in conjunction with the accompanying drawings.
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Adams Terry Lee
Mosquera Rene Augusto
Wood Del
ITT Manufacturing Enterprises Inc.
Ngo Hung V
Reichard Dean A.
Turner Roger C.
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