Metal working – Method of mechanical manufacture – Electrical device making
Patent
1988-10-31
1989-07-11
Echols, P. W.
Metal working
Method of mechanical manufacture
Electrical device making
29846, 29847, 427101, 427103, 338162, 264156, 264162, 26427218, H01C 1706
Patent
active
048458392
ABSTRACT:
A method is described for providing electrically resistive elements for mounting in an electrical resistor device for engagement with a relatively movable contact member, as in a potentiometer. A pair of termination openings are formed through a substrate of insulating material such as plastic film. A release liner is applied to the undersurface of the substrate to cover the openings. An electrically conductive medium is applied in fluid (paste) form to the top surface of the substrate and is caused to fill the termination openings, as by applying pressure. The conductive medium is solidified and the release liner is removed. A resistive medium for ultimate engagement with the movable contact is applied to the top surface of the substrate in engagement with the termination openings. The resistive track is shaped as desired, either linear or an annular segment, preferably as part of final shaping steps which also remove the resistive element from a continuous strip of the substrate material. The resultant shape of the resistive track includes the conductor-filled termination openings under opposite ends thereof. The resistive element may then be affixed to a more rigid substrate, with its pair of termination openings in alignment and conductivity joined to a respective pair of termination pads on the more rigid substrate.
REFERENCES:
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patent: 3655496 (1972-04-01), Ettre et al.
patent: 3673539 (1972-06-01), Healy et al.
patent: 4015231 (1977-03-01), Seno et al.
patent: 4112250 (1978-09-01), Moffitt et al.
patent: 4554732 (1985-11-01), Sadlo et al.
Echols P. W.
Hamilton Standard Controls Inc.
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