Position detection device
US9810550B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 13, 2013 |
| Grant date | Nov 7, 2017 |
| Priority date | — |
| Expiry date | May 23, 2034 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01D2205/776
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
In a position detection device of a type that omits a secondary coil, various inconveniences arising from the use of a voltage-dividing resistance (fixed resistor) are eliminated. At least two pairs of coils are provided. A magnetism-responsive member are placed so as to effect relative displacement in relation to the coils, the relative position of the member in relation to the coils varies with a position of a detection object, and impedance of each coil is varied with the relative position. The impedance changes of two coils constituting each one of coil pairs present characteristics of mutually opposite phase characteristics. For each coil pair, the two coils constituting the pair are connected in series with each other, and from a connection point thereof, a voltage-divided output voltage according to the impedance of the two coils is taken out as a detection output signal for the pair.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.