Capacitance position sensor and position controller equipped with the sensor
US6861848B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 25, 2002 |
| Grant date | Mar 1, 2005 |
| Priority date | — |
| Expiry date | Jan 20, 2023 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01S3/105
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A capacitance position sensor includes a pair of opposed tabular electrodes, an LC oscillator circuit having a toroidal core winding and whose oscillating frequency varies with change in capacitance between the pair of electrodes, and an arithmetic processing unit for calculating an absolute value of a distance between the electrodes from the oscillating frequency of the oscillator circuit. A position controller includes a stationary member formed with one electrode of the pair of electrodes of the position sensor, a movable member on which the other electrode of the pair of electrodes is formed, and moving device for moving the movable member relative to the stationary member.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.