Electromagnetic shielding assembly for printed circuit board

Claim 2

An electromagnetic shielding assembly for a PC board having ground trace segments disposed on a surface of the board, the shielding assembly comprising: a) a PC board cover adapted to be secured to the board surface, the cover including an integral base portion and fencing extending outwardly from a surface of the base portion, the fencing includes: i) an outer fencing segment having a peripheral edge configured to overlie an outermost ground trace segment on the PC board surface when the cover is secured to the board surface; and ii) a plurality of interior fencing segments disposed within the outer fencing segment, each of the plurality of interior segments having a peripheral edge configured to overlie a different ground trace segment disposed within the outermost ground trace segment on the board surface; b) a fastener to secure the cover to the PC board surface; and c) a sealing gasket disposed between said ground trace segments and said cover to seal the peripheral edges of the outer and interior fencing segments to corresponding ground trace segments when the cover is secured to the PC board surface.

Claim 3

The shielding assembly of claim 1 wherein the sealing gasket is comprised of silicone base impregnated with silver-plated copper.

Claim 4

The shielding assembly of claim 1 wherein the cover is die cast from a zinc-aluminum alloy.

Claim 5

The shielding assembly of claim 3 wherein the zinc-aluminum alloy is zamak #3.

Claim 6

The shielding assembly of claim 1 wherein the fastener is comprised of a plurality of screws extending through aligned apertures in the cover and the PC board.

Claim 7

The shielding assembly of claim 1 wherein the ground trace segments include gaps and the plurality of interior fencing segments include recesses in corresponding sections of the peripheral edges overlying the gaps.

Claim 8

An EMI shielding assembly for a PC board having ground trace segments disposed on opposite sides of the board, the shielding assembly comprising: (a) a first integrally molded PC board cover adapted to be secured to a first side of the board, the first cover including a base portion and a fencing portion extending from the base portion, the fencing portion configured to overlie the ground trace segments on the first side of the board when the first cover is secured to the first side of the board; (b) a second integrally molded PC board cover adapted to be secured to a second side of the board, the second cover including a base portion and a fencing portion extending from the base portion, the fencing portion configured to overlie the ground trace segments when the second cover is secured to the second side of the board; (c) a fastener to secure the first and second covers to the first and second sides of the board; and (d) a sealing gasket disposed between the fencing portions of the first and second covers and the ground trace segments to seal outwardly extending peripheral edges of said fencing portions to corresponding ground trace segments when the covers are secured to the PC board.

Claim 9

An EMI shielding assembly for a PC board having ground trace segments disposed on opposite sides of the board, the shielding assembly comprising: (a) a first integrally molded PC board cover adapted to be secured to a first side of the board, the first cover including a base portion and a fencing portion extending from the base portion, the fencing portion configured to overlie the ground trace segments on the first side of the board when the first cover is secured to the first side of the board; (b) a second integrally molded PC board cover adapted to be secured to a second side of the board, the second cover including a base portion and a fencing portion extending from the base portion, the fencing portion configured to overlie the ground trace segments when the second cover is secured to the second side of the board; (c) a fastener to secure the first and second covers to the first and second sides of the board; and (d) a sealing gasket disposed between the fencing portions of the first and second covers and the ground trace segments to seal outwardly extending peripheral edges of said fencing portions to corresponding ground trace segments when the covers are secured to the PC board.

Claim 10

The shielding assembly of claim 7 wherein the sealing gasket is comprised of silicone base impregnated with silver-plated copper.

Claim 11

The shielding assembly of claim 7 wherein each of the first and second covers are die cast from a zinc-aluminum alloy.

Claim 12

The shielding assembly of claim 9 wherein the zinc-aluminum alloy is zamak #3.

Claim 13

The shielding assembly of claim 7 wherein the fastener is comprised of a plurality of screws extending through aligned apertures in the first and second covers and the PC board.

Claim 14

The shielding assembly of claim 7 wherein the ground trace segments include gaps and the fencing portion includes recesses in sections overlying the gaps.

Claim 17

The method of claim 13 wherein the step of securing the cover to the board includes a substep of inserting a connecting member through aligned apertures in the cover and board.

Claim 18

The method of claim 14 wherein the connecting member includes a plurality of screws, the screws being tightened to a torque of substantially 1 inch-pound.