Composite function keyboard circuit
US12333086B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 4, 2023 |
| Grant date | Jun 17, 2025 |
| Priority date | — |
| Expiry date | Nov 28, 2043 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03K17/9625
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A composite function keyboard circuit includes a first matrix circuit, a first bias resistor group, a second matrix circuit, a second bias resistor group and a controller. Each switch unit in the first matrix circuit is an ink-type force sensing switch. A resistance of the ink-type force sensing switch is variable according to a pressing mode of a keypress action. An electrical connection path is formed between the ink-type force sensing switch and the corresponding bias resistor of the second bias resistor group. When the ink-type force sensing switch is electrically conductive, a divided sensing voltage is generated by the electrical connection path, and the controller generates a corresponding key control instruction according to a level of the divided sensing voltage. Furthermore, the cooperation of the first matrix circuit and the first bias resistor group can achieve a ghost key preventing function.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.