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US 6,707,244 B2Granted
Cathode-ray tube apparatus
AssigneeKabushiki Kaisha Toshiba
InventorsJunichi Kimiya, Hiroyuki Oda, Takahiro Hasegawa
Life of this patent
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Abstract
A dynamic focus electrode has a vibration-damping portion formed by a beading process at a peripheral portion of an electron beam passage hole thereof, a plate face thereof, or an embedment portion thereof. Thereby, vibration of the dynamic focus electrode is suppressed.
Claims8
A cathode-ray tube apparatus comprising:
- a substantially rectangular face panel;
- a funnel made continuous with the face panel;
- a phosphor screen formed on an inner surface of the face panel;
- an electron gun assembly disposed within a neck of the funnel and including an electron beam generating section that generates electron beams, and a main lens section that focuses the electron beams on the phosphor screen, the electron gun assembly having a plurality of electrodes including a dynamic focus electrode to be supplied with a dynamic focus voltage;
- a deflection yoke which produces deflection magnetic fields that horizontally and vertically deflect the electron beams emitted from the electron gun assembly;
- an insulating support which extends in a tube-axis direction and supports and fixes the plurality of electrodes of the electron gun assembly;
- and
- a plurality of stem pins provided at one end of the neck and electrically connected to the electrodes of the electron gun assembly,
- wherein said dynamic focus voltage is a voltage obtained by superimposing an AC component varying in synchronism with the deflection magnetic fields upon a reference voltage,
- said dynamic focus electrode comprises embedment portions to be embedded in the insulating support, electron beam passage holes that pass the electron beams through, and a vibration-damping portion formed in the surface including the electron beam passage holes to suppress vibration in the tube-axis direction, and
- said vibration-damping portion is formed of a recessed/projected portion recessed or projected in the tube-axis direction.
8 more elements
A cathode-ray tube apparatus comprising:
- a substantially rectangular face panel;
- a funnel made continuous with the face panel;
- a phosphor screen formed on an inner surface of the face panel;
- an electron gun assembly disposed within a neck of the funnel and including an electron beam generating section that generates electron beams, and a main lens section that focuses the electron beams on the phosphor screen, the electron gun assembly having a plurality of electrodes including a dynamic focus electrode to be supplied with a dynamic focus voltage;
- a deflection yoke which produces deflection magnetic fields that horizontally and vertically deflect the electron beams emitted from the electron gun assembly;
- an insulating support which extends in a tube-axis direction and supports and fixes the plurality of electrodes of the electron gun assembly;
- and
- a plurality of stem pins provided at one end of the neck and electrically connected to the electrodes of the electron gun assembly,
- wherein said dynamic focus voltage is a voltage obtained by superimposing an AC component varying in synchronism with the deflection magnetic fields upon a reference voltage,
- at least one of the electrodes, which is adjacent to said dynamic focus electrode, comprises embedment portions to be embedded in the insulating support, electron beam passage holes that pass the electron beams through, and a vibration-damping portion formed in the surface including the electron beam passage holes to suppress vibration in the tube-axis direction, and
- said vibration-damping portion is formed of a recessed/projected portion recessed or projected in the tube-axis direction.
8 more elements
A cathode-ray tube apparatus comprising:
- a substantially rectangular face panel;
- a funnel made continuous with the face panel;
- a phosphor screen formed on an inner surface of the face panel;
- an electron gun assembly disposed within a neck of the funnel and including an electron beam generating section that generates electron beams, and a main lens section that focuses the electron beams on the phosphor screen, the electron gun assembly having a plurality of electrodes including a dynamic focus electrode to be supplied with a dynamic focus voltage;
- a deflection yoke which produces deflection magnetic fields that horizontally and vertically deflect the electron beams emitted from the electron gun assembly;
- an insulating support which extends in a tube-axis direction and supports and fixes the plurality of electrodes of the electron gun assembly;
- and
- a plurality of stem pins provided at one end of the neck and electrically connected to the electrodes of the electron gun assembly,
- wherein said dynamic focus voltage is a voltage obtained by superimposing an AC component varying in synchronism with the deflection magnetic fields upon a reference voltage,
- each of said dynamic focus electrode and at least one of the electrodes, which is adjacent to said dynamic focus electrode, comprises embedment portions to be embedded in the insulating support, electron beam passage holes that pass the electron beams through, and a vibration-damping portion formed in the surface including the electron beam passage holes to suppress vibration in the tube-axis direction, and
- said vibration-damping portion is formed of a recessed/projected portion recessed or projected in the tube-axis direction.
8 more elements
Dependencies are inferred from the claim text.