US 6,674,653 B1 · Shielding scheme for a circuit board

Abstract

In a shielding scheme for circuit boards, conductive shields have contoured mating surfaces that become flat, or co-planar, at the circuit board-shield interface when the shields are fastened to opposite sides of the circuit board. The contoured mating surfaces compensate for deformation of the shields resulting from the fastening so that uniform mechanical pressure is applied at all designated points along the circuit board-shield interface even though fastening points are intermittently spaced throughout the shields. When compressible conductive gaskets are optionally interposed between the shields and the circuit board, stops are included to accommodate for the thickness of the gasket. High signal isolation is achieved without correspondingly high contact area on the circuit board and without closely-spaced fastening points. Low assembly time and manufacturing cost results for shielded circuit board assemblies incorporating the shielding scheme.

Claims20

Dependent claims

A shielding scheme for a circuit board, comprising:

a first conductive shield having a first series of fastening points and a first series of predistorted surfaces for mating with a contact area on a first side of the circuit board;
and
a second conductive shield having a second series of fastening points aligned with the first series of fastening points, and having a second series of predistorted surfaces for mating with a contact area on a second side of the circuit board, wherein the first series of predistorted surfaces is adapted become coplanar with the first side of the circuit board and the second series of predistorted surfaces is adapted become coplanar with the second side of the circuit board under condition that the first conductive shield is fastened to the second conductive shield at the fastening points.

A shielded circuit board assembly, comprising:

a circuit board;
a first conductive shield having a first series of fastening points and a first series of predistorted surfaces for mating with a contact area on a first side of the circuit board, each fastening point in the first series of fastening points having a corresponding stop;
a first compressible conductive gasket deposited on the first series of predistorted surfaces for interposing between the first side of the circuit board and the first conductive shield;
a second conductive shield having a second series of fastening points aligned with the first series of fastening points, and having a second series of predistorted surfaces for mating with a contact area on a second side of the circuit board, each fastening point in the second series of fastening points having a corresponding stop;
a second compressible conductive gasket deposited on the second series of predistorted surfaces for interposing between the second side of the circuit board and the second conductive shield, wherein the first conductive shield is fastened to the second conductive shield at the fastening points to cause the first series of predistorted surfaces to lie within a first plane when the corresponding stops of the first series of fastening points contact the first side of the circuit board and the second series of predistorted surfaces to lie within a second plane when the corresponding stops of the second series of fastening points contact the second side of the circuit board.

2 more elements

Dependencies are inferred from the claim text.

Shielding scheme for a circuit board

Life of this patent

Shielding scheme for a circuit board

Life of this patent

Abstract

Claims20