Lighting device, light apparatus, and signboard apparatus
US9468053B1 · kind B1 · utility
2Cited by
2References
11Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 21, 2016 |
| Grant date | Oct 11, 2016 |
| Priority date | — |
| Expiry date | Mar 21, 2036 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH05B45/44
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A lighting device includes: a drive circuit that supplies power to a light source; a switch connected in series with the light source; and a controller that controls pulse modulation for visible light communication executed through switching ON and OFF of the switch in a first interval, and stops the pulse modulation in a second interval. The controller controls a peak value, which is a high value of a pulsed current supplied from the drive circuit to the light source, to match an average current value in the first interval with an average current value in the second interval.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.