Precision color-controlled light source

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United States of America Patent

PATENT NO 9572223
SERIAL NO

15154315

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Abstract

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A color-controlled light source includes a plurality of light emitting diodes, the light emitting diodes being configured to emit different colors of light, intensity of the light emitted by the light emitting diodes being selectably adjustable. A sensor receives the light emitted by the light emitting diodes and converts the received light to electrical feedback signals corresponding to the emitted light. A processor generates an electrical reference signal. An amplifier receives the reference signal and the feedback signal, compares the feedback signal and the reference signal, and generates an error signal corresponding to a difference between the feedback signal and the reference signal. A current control receives the error signal and adjusts the intensity of at least one light emitting diode to cancel the error signal. A composite color emitted by the plurality of light emitting diodes has a predetermined, closed-loop controlled chromaticity.

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HUGHEY & PHILLIPS LLC240 WEST TWAIN AVENUE URBANA OH 43078

International Classification(s)

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  • 2016 Application Filing Year
  • H05B Class
  • 3665 Applications Filed
  • 2767 Patents Issued To-Date
  • 75.50 % Issued To-Date
Click to zoom InYear of Issuance% of Matters IssuedCumulative IssuancesYearly Issuances2016201720182019202020212022202320240255075100

Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Mula, Richard C Westlake Village, US 3 18
Ricca, Steven V Upper Arlington, US 9 44

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  • 7 Citation Count
  • H05B Class
  • 22.53 % this patent is cited more than
  • 8 Age
Citation count rangeNumber of patents cited in rangeNumber of patents cited in various citation count ranges3459871124816643411401 - 1011 - 2021 - 3031 - 4041 - 5051 - 6061 - 7071 - 8081 - 9091 - 100100 +05010015020025030035040045050055060065070075080085090095010001050

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