Magnet and displacement detection unit
US10401195B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 22, 2017 |
| Grant date | Sep 3, 2019 |
| Priority date | — |
| Expiry date | Jul 17, 2037 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01D5/145
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A displacement detection unit includes a magnet and a magnetic detector. The magnet includes a first magnetic-pole region polarized into a south pole and a second magnetic-pole region polarized into a north pole, and generates a magnetic field around the magnet. The magnetic detector is movable relative to the magnet in a first direction, and detects a change in the magnetic field and thereby detects a displacement of the magnet in the first direction. The magnet includes a transition section in which a ratio of a magnetic volume of the second magnetic-pole region in a second direction to a magnetic volume of the first magnetic-pole region in the second direction gradually varies in the first direction. The second direction is orthogonal to the first direction.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.