Electro mechanical position indicator using relatively moveable coils
US4223300A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Feb 16, 1978 |
| Grant date | Sep 16, 1980 |
| Priority date | — |
| Expiry date | Feb 16, 1998 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03M1/485
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
An electromechanical positioner indicator is provided which comprises first and second relatively movable parts, the first part including two oppositely facing surfaces which are everywhere equidistant and the second part including two surfaces which are everywhere equidistant and which are everywhere equispaced from and lie, closely adjacent to respective ones of the two surfaces of the first part. A first coil, preferably in printed circuit form, is secured to the first part and sensing coils, also preferably in printed circuit form, are secured to each of the two surfaces of the second part. The inductive coupling between the coils is dependent on the relative positions of the parts and thus the output of the sensing coils provides an indication of position. In one embodiment, the surfaces in question are formed by cylinders and in another, the first part is a disc and the main coil comprises an annulus. Particular coil and coil conductor shapes are also disclosed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.