Field-based movement sensing apparatus
US4995261A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 20, 1989 |
| Grant date | Feb 26, 1991 |
| Priority date | — |
| Expiry date | Oct 20, 2009 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01L1/2293
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A transducer for measuring strain in an object on which the transducer is placed includes a flexible, generally planar frame member for placement on the object. The frame member, in turn, includes a pair of generally parallel beams, one of which is moveable with respect to the other when the object is subjected to strain, and a plurality of spaced-apart laterally flexible connecting beams extending between the pair of beams. The transducer also includes a force field emitter disposed on the one moveable beam for producing a force field which diminishes in strength with distance from the force field emitter. A spacer plate is disposed on the other of said parallel beams and a substrate is disposed on the spacer plate so as to be be positioned above, but spaced from the frame member. A detection element is disposed on the underside of the substrate generally above the force field emitter for detecting the presence of the force field and for producing signals representing force field strength and thus the distance of the detecting element from the force field emitter.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.