Resources Contact Us Home
Browse by: INVENTOR PATENT HOLDER PATENT NUMBER DATE
 
 
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
Portable, single member housing cord protector
Integrated circuit packaging system with laser hole and method of manufacture thereof
Electronic time stamping apparatus for use with an inground transmitter
Liquid crystal display device
Method for manufacturing a substrate for a display device
Storage basket with lid
Providing a web page to a client
  Randomly Featured Patents
Coiler for strip metal
One-transistor random access memory technology compatible with metal gate process
Air moving device and method of making
Systems and methods to reference resources in a television-based entertainment system
Gas flush mixing system and method
Analogs of oxetanyl purines and pyrimidines
Electrolyte additive for lithium-sulfur dioxide electrochemical cell
Method and arrangement for binding round bales
Moulding method, in particular a blowing or vacuum moulding method for production of a dispensing container filled with a medium for dispensing
Dental handpiece