Cold Cathode Lighting Device As Fluorescent Tube Replacement
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United States of America Patent
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Issued Date -
Apr 28, 2011
app pub date -
Apr 23, 2010
filing date -
Oct 27, 2009
priority date (Note) -
Abandoned
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Abstract
A cold cathode lighting device is a fluorescent tube replacement and has a transparent tube, a cold cathode formed as a wire or rod with an electron emissive surface and passing through a center of the transparent tube. An extraction grid is formed around and spaced apart from the cold cathode and has an external diameter smaller than an inner diameter of the transparent tube. A phosphor material and a conductive material form an anode on an inner surface of the transparent tube. A vacuum is maintained within the transparent tube and a power conversion circuit in an end unit converts electrical power into a first potential applied to the cold cathode, a second potential applied to the extraction grid and a third potential applied to the anode. Electrons emitted from the cold cathode accelerate towards the anode and light is emitted from the fluorescent tube replacement light emitting device.
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