Cathode-ray tube apparatus
AssigneeKabushiki Kaisha Toshiba
InventorsHiroyuki Oda, Junichi Kimiya
Life of this patent
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Abstract
A main lens section of an electron gun assembly includes a focus electrode supplied with a focus voltage of a first level, a dynamic focus electrode supplied with a dynamic focus voltage obtained by superimposing an AC component, which varies in synchronism with deflection magnetic fields, upon a reference voltage close to the first level, and an anode supplied with an anode voltage with a second level higher than the first level. The electron gun assembly further includes at least two auxiliary electrodes disposed between the focus electrode and the dynamic focus electrode, and these at least two auxiliary electrodes are connected via a resistor disposed near the electron gun assembly.
Claims10
A cathode-ray tube apparatus comprising:
- an electron gun assembly including an electron beam generating section which generates an electron beam, and a main lens section which focus an electron beam generated from the electron beam generating section onto a phosphor screen;
- and
- a deflection yoke which generates deflection magnetic fields for deflecting and scanning the electron beam emitted from the electron gun assembly in a horizontal direction and a vertical direction,
- wherein the electron gun assembly includes a focus electrode supplied with a focus voltage of a first level and constituting a part of the main lens section, a first dynamic focus electrode supplied with a dynamic focus voltage obtained by superimposing an AC component, which varies in synchronism with the deflection magnetic fields, upon a reference voltage close to the first level, and constituting a part of the main lens section, a second dynamic focus electrode supplied with said dynamic focus voltage and disposed in a front stage of the main lens section, and an anode supplied with an anode voltage with a second level higher than said first level,
- at least two auxiliary electrodes are disposed adjacent to the second dynamic focus electrode,
- said at least two auxiliary electrodes are connected via a resistor disposed near the electron gun assembly, and
- the focus electrode and the first dynamic focus electrode are disposed adjacent to each other.
A cathode-ray tube apparatus comprising:
- an electron gun assembly including an electron beam generating section which generates an electron beam, and a main lens section which focus an electron beam generated from the electron beam generating section onto a phosphor screen;
- and
- a deflection yoke which generates deflection magnetic fields for deflecting and scanning the electron beam emitted from the electron gun assembly in a horizontal direction and a vertical direction,
- wherein the main lens section of the electron gun assembly includes a focus electrode supplied with a focus voltage of a first level, a dynamic focus electrode supplied with a dynamic focus voltage obtained by superimposing an AC component, which varies in synchronism with the deflection magnetic fields, upon a reference voltage close to the first level, and an anode supplied with an anode voltage with a second level higher than said first level,
- the electron gun assembly further includes at least two auxiliary electrodes disposed between the focus electrode and the dynamic focus electrode, and
- said at least two auxiliary electrodes are connected via a resistor disposed near the electron gun assembly.
Dependencies are inferred from the claim text.