Claims
- 1. A color cathode ray tube including
- a vacuum envelope comprising a panel portion, a neck portion, and a funnel portion connecting said panel portion and said neck portion;
- a phosphor screen on an inner surface of said panel portion;
- a shadow mask suspended closely spaced from said phosphor screen in said panel portion; and
- an electron gun housed within said neck portion;
- said electron gun comprising three cathodes for emitting three in-line electron beams and a plurality of electrodes each having electron beam apertures for passing said three in-line electron beams;
- said plurality of electrodes being fixed in a predetermined axially spaced relationship on insulating supports,
- at least one of said plurality of electrodes being cup-shaped and having a correction plate electrode therein, and
- edges of said correction plate electrode being formed with recesses and sloped portions extending in a direction away from said recesses toward an inner wall of said at least one of said plurality of electrodes.
- 2. A color cathode ray tube according to claim 1, wherein said correction plate electrode is formed with a center electron beam aperture having a diameter larger in a direction perpendicular to a direction of arrangement of said three in-line electron beams than a diameter thereof in said direction of arrangement of said three in-line electron beams.
- 3. A color cathode ray tube according to claim 2, wherein said correction plate electrode is formed with three electron beam apertures of a shape of a closed loop.
- 4. A color cathode ray tube according to claim 2, wherein said correction plate electrode is formed with two side electron beam apertures formed by cutout of edges of said correction plate electrode.
- 5. A color cathode ray tube according to claim 1, wherein said at least one of said plurality of electrodes has a step on an inner wall thereof to provide a first portion having an inside diameter larger on an open end side thereof than that of a second portion thereof on a side opposite said open end side, and said correction plate electrode is pressed against said step and welded to said at least one of said plurality of electrodes at edges thereof.
- 6. A color cathode ray tube according to claim 1, wherein said at least one of said plurality of electrodes has a step on an inner wall thereof to provide a first portion having an inside diameter larger on an open end side thereof than that of a second portion thereof on a side opposite said open end side, and said correction plate electrode is welded to said second portion at edges thereof.
- 7. A color cathode ray tube according to claim 1, wherein said at least one of said plurality of electrodes include a focus electrode and an anode forming a main lens therebetween, said correction plate electrode being provided in said focus electrode and being formed with three electron beam apertures having a shape of a closed loop, said correction plate electrode being provided in said anode and being formed with a center electron beam aperture having a shape of a closed loop and two side electron beam apertures formed by cutout of edges thereof.
- 8. A color cathode ray tube including
- a vacuum envelope comprising a panel portion, a neck portion, and a funnel portion connecting said panel portion and said neck portion;
- a phosphor screen on an inner surface of said panel portion;
- a shadow mask suspended closely spaced from said phosphor screen in said panel portion; and
- an electron gun housed within said neck portion;
- said electron gun comprising three cathodes for emitting three in-line electron beams and a plurality of electrodes each having electron beam apertures for passing said three in-line electron beams,
- said plurality of electrodes being fixed in a predetermined axially spaced relationship on insulating supports,
- at least one of said plurality of electrodes being cup-shaped and having a correction plate electrode therein welded to an inner wall thereof at edges of said correction plate electrode, and
- edges of said correction plate electrode being formed with a pair of recesses above and below a center electron beam aperture of said correction plate electrode and portions of a top edge and a bottom edge of said correction plate electrode sloping downward toward said center electron beam aperture.
- 9. A color cathode ray tube according to claim 8, wherein said center electron beam aperture of said correction plate electrode has a diameter which is larger in a direction perpendicular to a direction of the arrangement of said three in-line electron beams than a diameter thereof in said direction of the arrangement of said three in-line three electron beams.
- 10. A color cathode ray tube according to claim 8, wherein said correction plate electrode is formed with three electron beam apertures of a shape of a closed loop.
- 11. A color cathode ray tube according to claim 8, wherein said correction plate electrode is formed with two side electron beam apertures formed by cutout of edges of said correction plate electrode.
- 12. A color cathode ray tube including
- a vacuum envelope comprising a panel portion, a neck portion, and a funnel portion connecting said panel portion and said neck portion;
- a phosphor screen on an inner surface of said panel portion;
- a shadow mask suspended closely spaced from said phosphor screen in said panel portion; and
- an electron gun housed within said neck portion;
- said electron gun comprising a plurality of electrodes including a plurality of cathodes for emitting a plurality of in-line electron beams, a control grid having a plurality of in-line electron beam apertures centered with said plurality of cathodes, respectively, an accelerating electrode, a cup-shaped focus electrode and a cup-shaped anode fixed in a predetermined axially spaced relationship and in the order named from said plurality of cathodes towards said phosphor screen, on insulating supports,
- each of said cup-shaped focus electrode and said cup-shaped anode having, at a first end face thereof opposing another of said cup-shaped focus electrode and said cup-shaped anode, a single opening surrounded by a rim formed by turning in said first end face thereof toward an interior thereof,
- each of said cup-shaped focus electrode and said cup-shaped anode having a correction plate electrode therein at a position set back from said first end face toward said interior thereof,
- said correction plate electrode having electron beam apertures for passing said plurality of in-line electron beams,
- outer dimensions of said correction plate electrode being made smaller than corresponding inner dimensions of said cup-shaped electrode, and
- edges of said correction plate electrode being welded to projections formed on an inner wall extending in parallel with a direction of arrangement of said plurality of in-line electron beams, of each of said cup-shaped electrodes.
- 13. A color cathode ray tube according to claim 12, wherein said projections are tongues drawn inwardly and integrally from said cup-shaped electrons.
- 14. A color cathode ray tube according to claim 12, wherein said projections are formed by extruding inwardly and locally said cup-shaped electrodes.
Priority Claims (3)
Number |
Date |
Country |
Kind |
8-239498 |
Sep 1996 |
JPX |
|
8-293946 |
Nov 1996 |
JPX |
|
9-159497 |
Jun 1997 |
JPX |
|
CROSS REFERENCE TO RELATED APPLICATION
This is a continuation of U.S. application Serial No. 08/916,710, filed Aug. 25, 1997, now U.S. Pat. No. 5,886,462, the subject matter of which is incorporated by reference herein.
US Referenced Citations (2)
Number |
Name |
Date |
Kind |
4668892 |
Peels |
May 1987 |
|
5886462 |
Sudo et al. |
Mar 1999 |
|
Continuations (1)
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Number |
Date |
Country |
Parent |
916710 |
Aug 1997 |
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