Variable color discharge device
AssigneeResearch Institute For Applied Sciences
InventorsRyohei Itatani, Masatoshi Ryoko, Tatsushi Fujino
Life of this patent
Estimating the term…
Abstract
A discharge tube including a tubular vessel which is filled with gases, and including a first gas and second gas, the first and second gases being different in excitation level and luminous color from each other. A first electrode unit axially applies an electric field to the vessel to generate a positive column in the vessel. A second electrode unit applies an electric field to the vessel to generate a negative glow in an area, the area extending substantially along a wall surface of the vessel and confronting the positive column generated by the electric field applied by the first electrode.
Claims29
A discharge tube comprising:
- a tubular vessel;
- filled gases filled in said vessel and including a first gas and a second gas, said first and second gases being different in excitation level and luminous color from each other;
- first electrode means for applying axially an electric field to said vessel to generate a positive column in said vessel;
- and
- second electrode means for applying an electric field to said vessel to generate a negative glow in an area, said area extending substantially along a wall surface of said vessel and interacting with said positive column generated by the electric field applied by said first electrode means.
A discharge tube according to claim i, wherein an inner surface of said vessel is coated with a fluorescent substance for converting ultraviolet rays radiated from said first gas and/or said second gas into visible rays.
A discharge device having a discharge tube,
- said discharge tube including:
- a tubular vessel;
- filled gases filled in said vessel and including a first gas and a second gas, said first and second gases being different in excitation level and luminous color from each other;
- first electrode means for applying axially an electric field to said vessel to generate a positive column in said vessel;
- and
- second electrode means for applying an electric field to said vessel to generate a negative glow in an area, said area extending substantially along a wall surface of said vessel and interacting with said positive column generated by the electric field applied by said first electrode means,
- said discharge device further including a power unit, and control means for controlling power supply from said power unit to said first electrode means and said second electrode means.
A discharge tube comprising:
- a tubular vessel;
- filled gases filled in said vessel and including a first gas and a second gas, said first and second gases being different in excitation level and wavelength of radiated ultraviolet rays from each other;
- first electrode means for applying axially an electric field to said vessel to generate a positive column in said vessel;
- and
- second electrode means for applying an electric field to said vessel to generate a negative glow in an area, said area extending substantially along a wall surface of said vessel and interacting with said positive column generated by the electric field applied by said first electrode means,
- wherein an inner surface of said vessel is coated with a first fluorescent substance for converting mainly ultraviolet rays radiated from said first gas into first visible rays, and a second fluorescent substance for converting mainly ultraviolet rays radiated from said second gas into second visible rays which are different in wavelength from said first visible rays.
A discharge tube comprising:
- a tubular vessel;
- filled gases filled in said vessel and including a first gas and a second gas, said first and second gases being different in excitation level and wavelength of radiated ultraviolet rays from each other;
- first electrode means for applying axially an electric field to said vessel to generate a positive column in said vessel;
- and
- second electrode means for applying an electric field to said vessel to generate a negative glow in an area, said area extending substantially along a wall surface of said vessel and interacting with said positive column generated by the electric field applied by said first electrode means,
- wherein an inner surface of said vessel is coated with a first fluorescent substance for converting mainly ultraviolet rays radiated from said first gas into first visible rays, and a second fluorescent substance for converting the ultraviolet rays radiated from both said first and second gases into second visible rays which are different in wavelength from said first visible rays.
A discharge tube comprising:
- a tubular vessel;
- filled gases filled in said vessel and including a first gas and a second gas, said first and second gases being different in excitation level from each other, said first gas radiating mainly visible rays, said second gas radiating mainly ultraviolet rays;
- first electrode means for applying axially an electric field to said vessel to generate a positive column in said vessel;
- and
- second electrode means for applying an electric field to said vessel to generate a negative glow in an area, said area extending substantially along a wall surface of said vessel and interacting with said positive column generated by the electric field applied by said first electrode means,
- wherein an inner surface of said vessel is coated with a fluorescent substance for converting said ultraviolet rays radiated from said second gas into visible rays which are different in wavelength from said visible rays radiated from said first gas.
Dependencies are inferred from the claim text.