Methods of trimming film resistors
US4429298A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Feb 22, 1982 |
| Grant date | Jan 31, 1984 |
| Priority date | — |
| Expiry date | Feb 22, 2002 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T29/49099
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A bar-type film resistor (40) is adjusted to a high degree of precision by longitudinally offset plunge cuts (41, 42 and 43) extending from alternately opposite edges (29, 49) into the resistive layer (13), by a trim cut (46) which extends from the most recently made plunge cut (43) longitudinally through the resistor (40), and by a shave cut (47) which is coextensive with the trim cut and preferably overlapping therewith. The trim cut (46) and any shave cut (47) are located at a predetermined distance from a reference edge (29). The most recently completed plunge cut extends from its starting edge (29) into the resistive layer (13) to distances greater than those at which the trim cut and the shave cut are to be located.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.