Lighting fixture for visible light communication and visible-light-communication system with same
US9564969B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 5, 2012 |
| Grant date | Feb 7, 2017 |
| Priority date | — |
| Expiry date | Jan 1, 2033 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B10/116
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A lighting fixture for visible light communication is configured to modulate light intensity of a light source (11) comprising a light-emitting device (2) to superpose a communication signal on illumination light. The lighting fixture includes: a power supply circuit (3) configured to control light output of the light source (11) based on a dimming signal; a switch device (Q1) for modulating an output current from the power supply circuit (3) to the light source (11); an impedance element (Rx); a communication circuit (4); and an ON circuit (6). The communication circuit (4) is configured to supply a modulation signal to a side of the switch device (Q1) to superpose the communication signal on the illumination light. The ON circuit (6) is configured to turn on the switch device (Q1) by supply power from the power supply circuit (3) when the communication circuit (4) is inactivated.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.