Method and apparatus for detecting absolute position
US4757244A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 3, 1986 |
| Grant date | Jul 12, 1988 |
| Priority date | — |
| Expiry date | Jun 3, 2006 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01D5/2451
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A rod member provided with magnetic and non-magnetic portion arranged alternatingly is provided and a plurality of detecting heads for detecting magnetic resistance are disposed along the longitudinal direction of the rod member with predetermined distances, respectively. The pitches of the respective pairs of the magnetic and non-magnetic portions are arranged with pitches different with each other by the predetermined distances. Output signals transmitted from the detecting heads in accordance with the relative movement between the rod member and the detecting heads are detected by phase detectors, and on the basis of the detected signals, the predetermined operation is carried out in an operation processing unit thereby to obtain the absolute positional relation between the rod member and the detecting heads in, for example, of a positioning system such as in a die casting machine.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.