Force sensing resistor with calibration element and method of manufacturing same
US7113179B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 23, 2004 |
| Grant date | Sep 26, 2006 |
| Priority date | — |
| Expiry date | Mar 11, 2025 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01L1/205
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A force sensing resistor includes two substrates. Conductive traces including first, common, and calibration fingers are on the first substrate and define a contact area. A spacer surrounds the contact area and attaches the substrates together such that a cavity separates the substrates in the contact area. A first resistive layer is on the second substrate and arranged within the cavity. In response to a force moving one substrate, the first resistive layer electrically connects the first and common fingers with a resistance dependent upon resistivity of the first resistive layer and the applied force to produce an electrical signal indicative of the applied force. A second resistive layer is arranged within the cavity and electrically connects the calibration and common fingers with a resistance dependent upon resistivity of the second resistive layer to produce an electrical signal indicative of the resistivity of the second resistive layer.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.