Pulsed L.E.D. illumination
US9907137B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 25, 2015 |
| Grant date | Feb 27, 2018 |
| Priority date | — |
| Expiry date | Nov 10, 2036 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S362/802
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An illumination source for a camera includes one or more LEDs, and an electrical circuit that selectively applies power from the DC voltage source to the LEDs, wherein the illumination source is suitable for handheld portable operation. In some embodiments, the electrical circuit further includes a control circuit for driving the LEDs with electrical pulses at a frequency high enough that light produced has an appearance to a human user of being continuous rather than pulsed, the control circuit changing a pulse characteristic to adjust a proportion of light output having the first characteristic color spectrum output to that having the second characteristic color spectrum output. Some embodiments provide an illumination source including a housing including one or more LEDs and a control circuit that selectively applies power from a source of electric power to the LEDs, thus controlling a light output color spectrum of the LEDs.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.