Electrical resistors – Mechanically variable – Resistance value varied by removing or adding material
Patent
1993-11-01
1995-06-27
Lateef, Marvin M.
Electrical resistors
Mechanically variable
Resistance value varied by removing or adding material
338295, 338306, 338309, 29620, 29621, H01C 1010
Patent
active
054283396
ABSTRACT:
A trimmable resistor which is prepared with additional electrical contacts between the resistor and the substrate. These contacts are usually not connected electrically to the electronic circuit. Moreover, they do not extend across the entire width of the resistor. If the resistor is over trimmed, its resistance can be reduced by wire bonding a selected one of the additional electrical contacts to an end contact of the resistor. Multiple contacts may be placed along the substrate, both on the side of the resistor where trimming is to take place and on an opposite side.
REFERENCES:
patent: 2758256 (1956-08-01), Eisler
patent: 2878357 (1959-03-01), Thomson et al.
patent: 4017821 (1977-04-01), Schmidt
patent: 4216444 (1980-08-01), Vergnolle et al.
patent: 4859980 (1989-08-01), Hammond
"Small Size, Wide Trim Precision Thick Film Resistor", Greenstein, ISHM '93 Proceedings, pp. 700-707, Nov. 9-11, 1993.
Giesecke et al. "Stability of Reducing Resistance of Thick Film Resistors by Lasar Treatment", ISHM '92 Proceedings, 1992.
Intermedics Inc.
Lateef Marvin M.
Merkling John R.
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