Resources Contact Us Home
Method and apparatus for constant light output pulsed L.E.D. illumination

Image Number 8 for United States Patent #7393119.

An 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 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.

  Recently Added Patents
Three-dimensional filter
Image forming apparatus having a primary transfer unit, a secondary transfer unit, and a direct transfer unit
Blocky hydroxyethylcellulose, derivatives thereof, process of making and uses thereof
System and method for storing redundant information
Automatically selecting a paper with increased dimensions than originally desired for printing and adding advertisement content to the increased dimensional area of the paper
Method for producing a flexible composite elastomeric polyurethane skin
Buried object detection in GPR images
  Randomly Featured Patents
Ink jet printing method
Transmission arrangement of an agricultural or industrial utility vehicle
Carpeting trimmer
Case for magnetic media, programs and the like
Providing security to an electronic device
Fluid discharge device
Nanoscale amorphous magnetic metals
Glass powder promoter for carbonate supported catalyst and olefin dimerization processes therewith
Recording method for recording data on a storage medium
Self-adjusting cam lock for storage cabinet