Signalling system
US6624916B1 · kind B1 · utility
123Cited by
70References
109Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 11, 1999 |
| Grant date | Sep 23, 2003 |
| Priority date | — |
| Expiry date | Aug 11, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B10/1149
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A signalling system includes first and second signalling devices. The first signalling device including a retro-reflector modulator, having a lens, a modulator and a reflector, and being operable to receive, modulate and reflect the modulated signal back to the second signalling device. The second signalling device including a signal generator, a receiver for receiving the modulated signal from the first signalling device and a processor for retrieving modulation data from the received modulated signal. The lens of the first signalling device includes a telecentric lens.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.