Roller construction with direction finding for a mobile navigation device
US7145557B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jun 9, 2004 |
| Grant date | Dec 5, 2006 |
| Priority date | — |
| Expiry date | Jul 24, 2024 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01H2019/146
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
The present invention is a roller construction with direction finding for a mobile navigation device. The present invention comprises a hollow conductive ring with several slots at an end, wherein a contacting area is set on the inner surface of the protruding part between each two neighboring slots; a support to plug the conductive ring; and a plurality of terminals plugged in from both two end surfaces of the conductive ring, wherein the terminals at one end surface are plugged in at the depth no deeper than the bottoms of the slots. By the simple structure of the present invention, the conductive ring interacts with the terminals, wherein the first rolling direction can be differed from the second rolling direction by signals sent with time differential.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.