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US 6,472,832 B1Granted
Cathode ray tube
AssigneeKabushiki Kaisha Toshiba
InventorsJunichi Kimiya, Shigeru Sugawara, Syunji Ookubo
Life of this patent
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Abstract
A sixth grid, which is part of a main electron lens section, is made up of a first anode, an auxiliary electrode and a second anode. A fifth grid is applied with an intermediate voltage. The first and second anodes are applied with an anode voltage. An intermediate electrode and the auxiliary electrode are applied with a voltage whose level is between the levels of the intermediate voltage and anode voltage.
Claims8
A cathode ray tube comprising:
- an electron gun assembly including:
- an electron beam formation section for forming and emitting at least one electron beam;
- and a main electron lens section for accelerating the electron beam and focusing the electron beam on a screen;
- and
- a deflection yoke for generating a deflecting magnetic field, with which the electron beam emitted from the electron gun assembly is deflected to the screen in a horizontal direction and a vertical direction,
- said main electron lens section being an electric field expansion type lens including:
- a focusing electrode applied with a focusing voltage of a first level;
- an anode applied with an anode voltage of a second level higher than the first level;
- and at least one intermediate electrode arranged between the focusing electrode and the anode and applied with an intermediate voltage of a third level which is higher than the first level and lower than the second level,
- said anode including:
- a first anode;
- a second anode located closer to the screen than the first anode as viewed in the traveling direction of electron beams;
- and at least one auxiliary electrode interposed between the first anode and the second anode,
- said at least one auxiliary electrode and said at least one intermediate electrode being electrically connected to each other.
11 more elements
Dependencies are inferred from the claim text.