Electronic touch key
US4125794A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 20, 1977 |
| Grant date | Nov 14, 1978 |
| Priority date | — |
| Expiry date | Jun 20, 1997 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S315/07
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
Electronic touch key assembly with a metal probe having touch or keying surfaces through which, when the surfaces are contacted, a capacitive reactive current flows, triggering a switching amplifier through which an electronic valve for controlling brightness of a lamp is opened, including a high resistance serially connected to the touch or keying surfaces, the surfaces being formed of metal and being insulated from one another, a filter and a rectifier connected to the high resistance, the high resistance serving through the filter and the rectifier as a voltage source, a first and a second bistable multivibrator, the voltage source having an output connected to the second bistable multivibrator, the first bistable multivibrator being connected to the second bistable multivibrator and serving as a switching amplifier which, at a defined voltage threshold of the line voltage, sets the second bistable multivibrator into an opposite output state, a PNP transistor having a base, the second bistable multivibrator having an output connected to the base of the PNP transistor for addressing the latter, the electronic valve including a Triac, and the transistor being connected to the Tria…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.