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This article describes a socket device which utilizes the rotational effect of an eccentric cam to wipe and then mate two conductive surfaces. The eccentricity of the cam controls the amount of wipe.
English (United States)
This text was extracted from a PDF file.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately
54% of the total text.
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Wiping Zero Insertion Force Sockets
This article describes a socket device which utilizes the rotational effect of an
eccentric cam to wipe and then mate two conductive surfaces. The eccentricity
of the cam controls the amount of wipe.
Fig. 1 is a cross-section view of the wiping zero insertion force (ZIP) socket.
One eccentric cam is required for each contact card
surface A with the rotation force tending to pull the card into the socket housing.
The center lines of the cam are supported by the socket housing body. The
eccentric cam is used to provide electrical connection between the card surface
A and electrical conductors C connected to external socket conductors D. A
flexible media carries the electrical conductors supported by an elastomer E and
minimizes molding tolerance requirements.
Figs. 2A, 2B and 2C show the construction of the eccentric cam in an end
and top view. The cam is constructed using a knurled metal core shaft H to
evenly distribute the rotational forces over the length of the cam. A knurled
surface J will minimize slippage. This knurled rod is covered with an eccentric
rubberized coating K that will maintain the appropriate hardness over its useful
life. This surface is covered with a flexible media with etched metal conductors L
aligned perpendicular to the axis of the cam. Several suitable flexible media
exist, such as an etched copper-clad flexible media plated with nickel and gold.
The conductive rings L are not required to circumnavigate the cam but only