Measuring table for co-ordinate measuring system
US4855538A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 2, 1987 |
| Grant date | Aug 8, 1989 |
| Priority date | — |
| Expiry date | Oct 2, 2007 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F3/047
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A digitizer comprising a measuring table having a substrate on which a grid is mounted, and a movable coil inductively coupled to the grid. When a time variable current is applied, a variable magnetic flux produces a measuring signal in the form of an induced voltage. The grid is a plurality of side-by-side, parallel conductors, each having opposite axial ends and arranged in pairs. A bridge is provided between adjacent ends of a plurality of the pairs of conductors. Current flowing into the opposite end of one conductor of a pair of conductors, thus, produces oppositely directed magnetic fields around the conductors of the pair, or a changing magnetic flux produced by the coil and interacting with the conductors of a pair induces voltages of opposite polarity in the conductors of the pair.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.