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US 4,506,191 AGranted
Light source cathode ray tube
AssigneeMitsubishi Denki Kabushiki Kaisha
InventorShinya Takenobu
Life of this patent
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Abstract
A cathode ray tube light ray source uses only a single current control electrode between the cathode and anode, and the aperture in the electrode is between 1 mm and 3 mm in diameter. The distance from cathode to current control electrode is also between 1 mm and 3 mm. The anode is preferably a graphite film deposited on the interior of the envelope and extending over the entire distance from the current control electrode to the fluorescent screen.
Claims13
A cathode ray tube light source, comprising:
- an envelope having a fluorescent material on an interior surface thereof;
- a cathode disposed within said envelope;
- an anode disposed within said envelope;
- only one current control electrode having an aperture therein and disposed between said anode and cathode, said current control electrode being separated from said cathode by a distance l.sub.G1K measured in a direction from said cathode to said fluorescent screen and said distance l.sub.G1K has a value substantially between 1 mm and 3 mm;
- and
- potential source means for applying potentials to said anode, cathode and current control electrode, the potential applied to said anode electrode being higher than the potentials applied to said cathode and current control electrode, whereby a divergent electron beam strikes said fluorescent material to cause light emission.
3 more elements
A cathode ray tube light source comprising:
- an envelope having a fluorescent material on an interior surface thereof;
- a cathode disposed within said envelope;
- an anode disposed within said envelope;
- a first current control electrode having an aperture therein and disposed between said anode and cathode, said current control electrode being separated from said cathode by a distance l.sub.G1K measured in a direction from said cathode to said fluorescent screen and said distance l.sub.G1K has a value substantially between 1 mm and 3 mm;
- a second current control electrode located between said first current control electrode and said anode;
- and
- potential source means for applying potentials to said anode, cathode and first and second current control electrodes, the potential applied to said anode electrode and said second control electrode being higher than the potentials applied to said cathode and first current control electrode, whereby a divergent electron beam strikes said fluorescent material to cause light emission.
4 more elements
Dependencies are inferred from the claim text.