Film resistors having trimmable electrodes

Electrical resistors – With base extending along resistance element – Resistance element coated on base

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338 22R, 338195, 338309, H01C 1012

Patent

active

053630840

ABSTRACT:
Thin or thick film resistor devices (e.g., electronic resistors and thermistors) are trimmable without disturbing the active resistor film or necessarily requiring temperature control during trimming by providing a plurality of electrically conductive fingers having one end integral with one of the electrodes and a terminal end which extends at least substantially across the cross-wise dimension of the resistance film. The electrode fingers thereby electrically bridge a respective surface region of the substrate on which the electrodes and film are disposed. One or more of these fingers may thus be severed from the electrodes at the bridged respective surface region of the substrate so that the resistance value of the device can be controllably selected. By providing various finger-to-finger separation dimensions (to thereby establish various widths of segments of the active resistor film), a large number of resistance trimming combinations can be provided so that virtually any desired resistance value for the device can be obtained in dependence upon the particular finger(s) which is(are) severed. The resistance of very high resistance thermistors may also easily be reduced (e.g., by factors of 100 or more) to an extent where impedance loading measuring errors are minimized (if not eliminated entirely), or low TCR circuit resistors are varied in resistance as desired over a wide range without having to change the formulation of the resistor body material.

REFERENCES:
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patent: 4401881 (1983-08-01), Saito
patent: 4453151 (1984-06-01), Leary et al.
patent: 4780598 (1988-10-01), Fahey et al.
patent: 4983944 (1991-01-01), Uchida et al.
patent: 5015986 (1991-05-01), Uchida et al.
patent: 5045828 (1991-09-01), Kulwicki et al.
patent: 5065221 (1991-11-01), Imamura
V. Comello, "Photodetector Sets Speed Record for Silicon", R&D Magazine, p. 51 (Dec. 1993).
L. Spitz, "Trimmed for Precision", Electronic Packaging & Productions, pp. 48-49 (Oct. 1985).

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