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Browse Prior Art Database

Polymer Hot Plug Device

IP.com Disclosure Number: IPCOM000035410D
Original Publication Date: 1989-Jul-01
Included in the Prior Art Database: 2005-Jan-28
Document File: 2 page(s) / 47K

Publishing Venue

IBM

Related People

Aakalu, NG: AUTHOR [+2]

Abstract

Polymer-type hot plug devices can be fabricated on thin wires and at relatively low temperatures as compared to glass based thick film types. Also polymer types can be applied to card edge connectors. These devices are called "hot plug" devices because their resistance prevents undesired current surges when installed under power-on conditions.

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Polymer Hot Plug Device

Polymer-type hot plug devices can be fabricated on thin wires and at relatively low temperatures as compared to glass based thick film types. Also polymer types can be applied to card edge connectors. These devices are called "hot plug" devices because their resistance prevents undesired current surges when installed under power-on conditions.

Figs. 1 and 2 show the concept in the pin form. Carbon and/or precious metal powder-filled polymer 10 is applied on top of an insulative polymer surface
12. The insulative polymer 12 is pre-applied on top of a suitable wire material 14. Wire 14 can also have a gold- plated surface 16.

Socket wiper contacts 18, of suitable shape and plating make contact with the resistor pin during plugging or unplugging of an electronic sub-assembly of a powered electronic system and rest on the gold surface 16 when the pin is fully inserted into the socket (not shown). The function of the wire 14 is to provide mechanical strength and stiffness. It also provides electrical conduction between the connector contacts and to a circuit board (not shown) to which the base end 20 of the plug is attached.

The resistor coating can be of a combination of adjacent resistor rings 10a, 10b of different sheet resistance values. The final ring 10b makes electrical contact at its bottom end 22 to the gold plating 16 on the pin.

Fig. 3 shows hot plug pads 30 on a card edge connector of a printed circuit card or some other electronic...