Keypad overlay with electrostatic discharge dissipation
US12035449B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 27, 2022 |
| Grant date | Jul 9, 2024 |
| Priority date | — |
| Expiry date | Oct 28, 2042 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH05K5/0017
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A plastic keypad with data entry elements and at least one display element is protected from electrostatic discharge by an assembly having an overlay substrate on which an electrically-conductive arrangement is disposed. The overlay substrate has a top side and a back side with a precisely-positioned vias formed through the substrate. A top surface of the top side is a layer of a conductive polymer. The back side is printed with at least one layer of color ink that depict a plurality of alpha-numerical and pictorial elements of the keypad. The electrically-conductive arrangement is disposed on the overlay substrate to collect electrostatic charges on the top side, transfer the electrostatic charges to the back side through the plurality of vias and drain the transferred electrostatic charges to a ground.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.