Capacitive sensing apparatus designs
US7692431B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Apr 23, 2009 |
| Grant date | Apr 6, 2010 |
| Priority date | — |
| Expiry date | Apr 23, 2029 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01D5/2415
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A capacitive sensing apparatus includes a plurality of electrically conductive sensing elements that have widths that vary and lengths that traverse a sensing region. The sensing elements include a first sensing element including a first variable-width portion and a second variable-width portion that in combination produce a combined first sensor signal, a second sensing element including a third variable-width portion and a fourth variable-width portion that in combination produce a combined second sensor signal, and a third sensing element including a fifth variable-width portion and a sixth variable-width portion that in combination produce a combined third sensor signal. The first, third and fifth variable-width portions are arranged in a first pattern and the second, fourth and sixth variable-width portions are arranged in a second pattern, wherein the first pattern and the second pattern are bilaterally symmetrical about a median that is substantially equidistant from opposite edges of the sensing region.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.