Position encoder
US4524347A · kind A · utility
26Cited by
2References
22Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Apr 18, 1983 |
| Grant date | Jun 18, 1985 |
| Priority date | — |
| Expiry date | Apr 18, 2003 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01D5/36
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A position measuring device includes a conventional encoder, a scale member and an index member together arranged to provide two periodic waveforms of the same frequency and in quadrature with one another. Errors in the waveforms are corrected, and the corrected waveforms used to produce an indication of the position represented by the waveforms. The two positional indications are combined to give a high-resolution output. The conventional encoder may be absolute or incremental, and the device may be used to measure linear or angular position relative to a datum.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.