H - Electricity – 05 – B
Patent
H - Electricity
05
B
315/67
H05B 41/16 (2006.01) G09F 13/26 (2006.01) H01J 17/38 (2006.01)
Patent
CA 1279091
ABSTRACT OF THE DISCLOSURE An elongate cold cathode gas discharge tube comprises a gas discharge tube containing an ionizable gas having a cathode element disposed to cause ionization of the gas and a power source connected to provide an alternating voltage, referenced to ground potential, to the cathode element and of sufficient magnitude and frequency to cause the gas to ionize through the natural surrounding capacitance between the ionized gas and ground potential, the power source being adjustable to provide a variable voltage thereby to vary the extent of ionization of the gas, along the tube in a direction away from the cathode element. An improved method of causing illumination of an elongated cold cathode gas discharge tube containing an ionizable gas and having a cathode element disposed to cause ionization of the gas comprises the steps of: (a) connecting an alternating voltage referenced to ground potential and of sufficient frequency to cause the gas to ionize through the natural surrounding capacitance between the ionized gas and ground potential to the cathode element; and (b) varying the voltage between first and second levels whereby the extent of ionization of the gas along the tube in a direction away from the cathode element will vary with and be determined by the voltage.
562986
Bertonee Inc.
Ridout & Maybee Llp
LandOfFree
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