Touch operated capacitive switch for electronic musical instruments
US4170916A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 23, 1977 |
| Grant date | Oct 16, 1979 |
| Priority date | — |
| Expiry date | Jun 23, 1997 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG10H1/0551
- WIPO fieldOther consumer goods
- WIPO sectorOther fields
Abstract
A touch operated capacitive switch for altering electrical signals controlling the mode of operation of an electronic musical instrument. The switch comprises a thin laminate having a non-conducting lamina sandwiched between a conducting touch electrode and a conducting guard electrode, each electrode having an electrical connector for connecting the switch to alternating electrical signals having substantially the same phase and amplitude to reduce the capacitance between the touch electrode and points of ground potential located in or on the instrument for increasing the sensitivity of the switch. The switch is non-conductively secured to the instrument with the guard electrode facing the instrument, such that the capacitance of the switch may be altered by touching the touch electrode.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.