Electricity: electrical systems and devices – Housing or mounting assemblies with diverse electrical... – For electronic systems and devices
Patent
1993-10-20
1994-06-07
Picard, Leo P.
Electricity: electrical systems and devices
Housing or mounting assemblies with diverse electrical...
For electronic systems and devices
361792, 361794, 439108, 439109, 439 59, H05K 900
Patent
active
053195230
ABSTRACT:
The main system printed circuit board of a computer is mounted on a tray structure that also supports other CPU components of the computer and is removably insertable into the housing portion of the computer. A specially designed card edge connector portion of the system board is operatively insertable into a socketed connector on another circuit board interiorly mounted within the housing. Electrically conductive signal fingers and grounding fingers are respectively mounted on first and second sides of the card edge, with the signal fingers being connected to the signal plane of the system board, and the grounding fingers being connected to its ground plane. A sacrificial grounding pad is positioned on the second side of the edge connector portion, between the grounding pads and its leading edge, and is initially engaged by the internal connector contact strips, as the card edge is being inserted into the connector, to equalize any voltage potential between the two circuit boards before the contact strips engage the signal and grounding fingers The grounding pad thus eliminates the necessity of incorporating clamping diodes in the system board circuitry to avoid ESD damage to its components. The initially engageable grounding pad also serves as a sacrificial contact wear member that lengthens the connectivity life of the system board by diminishing the mechanical wear-away of the signal and grounding fingers.
REFERENCES:
patent: 3432795 (1969-03-01), Jayne
patent: 3973817 (1976-08-01), Stalley et al.
patent: 4849944 (1989-07-01), Matsushita
patent: 5041945 (1991-08-01), Suzuki
patent: 5277611 (1994-01-01), Berek et al.
Ganthier James J.
Landry John A.
Compaq Computer Corporation
Picard Leo P.
Sparks Donald A.
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