Method and apparatus for a variable intensity pulsed L.E.D. light
US7186000B2 · kind B2 · utility
Inventors
Key dates
| Filing date | Sep 20, 2004 |
| Grant date | Mar 6, 2007 |
| Priority date | — |
| Expiry date | Sep 20, 2024 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S362/802
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Improved method and apparatus for hand-held portable LED illumination. The illumination source includes a plurality of LEDs, and an electrical circuit that selectively applies power from the DC voltage source to the LED units, wherein the illumination source is suitable for handheld portable operation. In some embodiments, the electrical circuit further includes a control circuit for changing a proportion of light output having the first characteristic color spectrum output to that having the second characteristic color spectrum output, and that drives 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. Still another aspect provides 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.