Remote-indicating magnetic compass
US4146970A · kind A · utility
Inventor
Key dates
| Filing date | Dec 26, 1973 |
| Grant date | Apr 3, 1979 |
| Priority date | — |
| Expiry date | Dec 26, 1993 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01C17/26
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A remote-indicating magnetic compass system for use with automobiles or the like. The system consists of a dashboard-mounted readout unit, which receives and decodes logic signals provided thereto from a remotely located electro-optical shaft encoder, the latter being responsive to and positioned by the earth's magnetic field. The form of bearing readout is discrete rather than continuous, e. g. 8 or 16 bearing states are described. The bearing readout display may be defined by a plurality of discrete indicators, such as light-emitting diodes, or segmented alpha indicators or so forth may be employed. The electro-optical shaft encoder assembly is preferably located at a point on the vehicle distant from large bodies of iron or steel, and where the earth's field is strong relative to fields associated with permanently magnetized auto parts.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.