Precision solid state string motion transducer for musical instruments with non-ferromagnetic strings, and method for precision measurements of time-variable position using 3-pole permanent magnets
US10332499B2 · kind B2 · utility
Inventor
Key dates
| Filing date | Jun 12, 2017 |
| Grant date | Jun 25, 2019 |
| Priority date | — |
| Expiry date | Jun 12, 2037 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG10H2220/521
- WIPO fieldOther consumer goods
- WIPO sectorOther fields
Abstract
A single axis position transducer uses an elongate permanent three pole magnet having a radial magnetic field at a spot along the magnet in which the magnetic field has radial field lines that decay as 1/R. R is the distance from the center of the magnet along a radial field line perpendicular to the axis of the magnet. The spot has a first pole of one polarity, and the magnet has poles of the opposite polarity spaced along the magnet on opposite sides of the first pole of the radial magnetic field located at the spot. At least one magnetic field sensor is positioned proximal to the spot along the elongate member that detects the motion of the spot and electrically amplifies the sensor output.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.