Two-layer capacitive touchpad and method of making same
US6188391A · kind A · utility
2,143Cited by
8References
22Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 9, 1998 |
| Grant date | Feb 13, 2001 |
| Priority date | — |
| Expiry date | Jul 9, 2018 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH05K3/4664
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
By suitable use of screen-printed carbon ink patterning, combined with patterning of the solder-mask layer on the top (finger) surface, a compact capacitive touchpad pointing device has been realized using only a two-layer board as a substrate. The first layer, on the topside of the printed circuit board, combines both the horizontal and vertical sensor electrode traces. The second layer, located on the underside of the printed circuit board, is formed in the conventional manner by attaching the controller chip and/or related circuitry.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.