Light communication system and illumination apparatus therefor
US7548698B2 · kind B2 · utility
61Cited by
3References
10Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Aug 26, 2005 |
| Grant date | Jun 16, 2009 |
| Priority date | — |
| Expiry date | Apr 26, 2027 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B10/116
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
An illumination apparatus is used in the light communication system. The apparatus receives electricity from a commercial alternating-current power source and a light-emitting element in the apparatus emits light. The zero passage time of commercial alternating-current power source is detected and signals are transmitted from illumination apparatus, or intercommunications between terminals of communication equipment take place, during a specific reserved time that is in synchronization with this zero passage time.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.