United States Patent [19] [ii] Patent Number: 5,043,848
Rogers et al. [45] Date of Patent: Aug. 27, 1991
[54] SHIELDED PRINTED CIRCUIT BOARD
[75] Inventors: Steven A. Rogers, Leesburg; George Bockelmann, Vienna; Gary Hester, Sterling, all of Va.
[73] Assignee: Cryptec, Inc., Herndon, Va.
[21] Appl. No.: 473,635
[22] Filed: Feb. 1, 1990
[51] Int. Cl.s H05K9/00
[52] U.S. CI 361/424; 174/35 R;
174/51; 361/414
[58] Field of Search 361/400, 414, 424;
174/35 R, 51
[56] References Cited
U.S. PATENT DOCUMENTS
3,179,913 4/1965 Mittler et al 361/424
4,370,515 1/1983 Donaldson 361/424
4,658,334 4/1987 McSparran et al 361/414
4,739,453 4/1988 Kurokawa 361/424
4,831,498 5/1989 Baba 361/424
Primary Examiner—Gregory D. Thompson
Attorney, Agent, or Firm—Cushman, Darby & Cushman
[57] ABSTRACT
An improved shielding assembly for a circuit board. The assembly includes a multi-layer circuit board, each layer of which has ground planes around the perimeter thereof. An edge plating on the circuit board connects the ground planes to one another. A number of tab holes are also in the board, and the shielding assembly is formed as a conductive box which is connected to the tab holes. A shielded area is formed within the shielding assembly. The shielding assembly is preferably formed by etching fold locations and folding, and by etching tabs to be formed.
17 Claims, 4 Drawing Sheets
