Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – With rotor
Patent
1989-08-07
1990-07-03
Karlsen, Ernest F.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
With rotor
324158P, G01R 3102, G01R 106
Patent
active
049394541
ABSTRACT:
The connector system for a printed circuit board test facility provides an efficient and unitary electrical and mechanical interconnection between the scanner pins of the bed of nails and the device scanner elecronics printed circuit cards that comprise the printed circuit board test facility. The connector system consists of a plurality of connector blocks oriented in a side by side arrangement to implement the xy coordinate axis matrix of scanner pins of the bed of nails. Each connector block consists of a custom molded plastic block that is equipped with replaceable spring loaded scanner pins. The connector block offers very high stiffness to minimize deflection under load of the spring loaded pins, very accurate dimensional stability, high impedance to electrical signals, a thermal expansion characteristic similar to the probe plate to which it is attached and very accurate positioning. Each scanner pin is connected t a lead wire that is bent in the shape of a question mark. Each lead wire passes through a corresponding plated hole in the device scanner electronics printed circuit card of the printed circuit board test facility and is soldered in place. The bend in the lead wires minimizes mechanical resistance to relative motion and also minimizes stress on the soldered connection and scanner pin caused by such motion. This connector system configuration provides a number of important characteristics: short electrical path from the scanner pins to the electronics on the device scanner electronics printed circuit cards; very accurate three axis location of each scanner pin with respect to a single fixed point in space; significant single axis compliance between the scanner pin and the device scanner electronics printed circuit cards to allow for scanner pin positioning when the device scanner electronics printed circuit card is fixed in that axis.
REFERENCES:
patent: 4340858 (1982-07-01), Malloy
patent: 4417204 (1983-11-01), Dehmel et al.
patent: 4465972 (1984-08-01), Sokolich
patent: 4724377 (1988-02-01), Maelzer et al.
Part No. 168249; Virginia Panel Corp., Waynesbourgh VA; 7-1987.
Hewlett--Packard Company
Karlsen Ernest F.
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