Claims
- 1. A cathode ray tube apparatus comprising:
- an electron gun assembly, having three gun axes aligned in a horizontal plane, for focusing and converging three electron beams;
- means for generating horizontal and vertical deflection magnetic fields that deflect the three electron beams emitted from the electron gun assembly in both a horizontal plane and a vertical plane, the horizontal deflection magnetic field being formed as a pincushion-shaped field; and
- means for emitting red, green and blue light rays when the deflected electron beams impinge thereon;
- said electron gun assembly including:
- means for emitting three electron beams, the emitting means being arranged in-line in the horizontal plane, along the three gun axes, respectively, for accelerating and controlling the electron beams, and for causing the three electron beams to cross the gun axes thereby defining a dot-like first cross-over on each gun axis;
- first electron lens means for focusing the electron beams and having a vertical-lens power in the vertical plane and a horizontal-lens power in the horizontal plane, the vertical-lens power being greater than the horizontal-lens power, thereby causing the three electron beams to cross the gun axes in the vertical plane so as to define line-like second cross-overs extending in the horizontal plane of the gun axes, respectively, wherein said horizontal-lens power remains constant and is not dependent upon deflection of said electron beams;
- second electron lens means for focusing the three electron beams on the phosphor screen; and
- cross-over shifting means for changing the vertical-focusing power, in accordance with horizontal or vertical deflection, thereby shifting the line-like second cross-overs on the gun axes between the first electron lens means and the second electron lens means;
- wherein said first and second electron lens means correct for deflection and distortion that is caused by said pincushion-shaped field.
- 2. The gun assembly according to claim 1, wherein said first electron lens means is formed by an electrode having a plurality of holes, each hole having a horizontal dimension and a vertical dimension smaller than the horizontal dimension.
- 3. The electron gun assembly according to claim 1, wherein said first electron lens is formed by an electrode having a single hole having a horizontal dimension and a vertical dimension smaller than the horizontal dimension.
- 4. The electron gun assembly according to claim 1, wherein said second lens is formed by an electrode having a plurality of holes.
- 5. The electron gun assembly according to claim 1, wherein said second lens is formed by an electrode having at least one common hole.
- 6. The electron gun assembly according to claim 1, wherein said cross-over shifting means varies the vertical-lens power of said first lens means.
- 7. A cathode ray tube apparatus, comprising:
- an electron gun assembly having three gun axes aligned in a horizontal plane, for focusing and converging three electron beams;
- means for generating horizontal and vertical deflection magnetic field to deflect the three electron beams emitted from the electron gun assembly in both a horizontal plane and a vertical plane, the horizontal deflection magnetic field being formed as a pincushion-shaped field; and
- a phosphor screen for emitting red, green and blue light rays, when the deflected electron beams impinge thereon;
- said electron gun assembly including:
- three cathodes arranged in in-line alignment for emitting three electron beams along the three gun axes, respectively;
- control electrode means, having three round holes, for accelerating and controlling the electron beams which have been emitted by said cathodes, and for causing each of the three electron beams to cross its respective gun axis and thereby define a dot-like first cross-over on each of the gun axes;
- first electrode means including electrode structures, which have first plates and second parallel plates facing one another, the first plate being on a cathode side and having three round holes for guiding the three electron beams, respectively, and the second plates being on a phosphor screen side and having a hole elongated in a horizontal direction for guiding the electron beams and for causing each of the three electron beams to cross its respective gun axis in the vertical plane, thereby defining a line-like second cross-over extending in the horizontal plane on each of the gun axes, one of said electrode structures having its second plates being applied with a potential changed in accordance with the horizontal or vertical deflection of the electron beams, and the remaining electrode structures being held at a predetermined potential, thereby shifting the line-link second cross-overs on the gun axes; and
- second electrode means having one through hole for guiding the three electron beams emerging from the line-like second cross-overs, for focusing the electron beams and also for converging the electron beams while the beams are travelling toward the phosphor screen;
- wherein said first and second electrode means correct for deflection and distortion that is caused by said pincushion-shaped field
- 8. The electron gun assembly according to claim 7, wherein the elongated hole of said second electrode means has a straight portion having a predetermined width and two broad portions continuous to the straight portion.
- 9. The electron gun assembly according to claim 8, wherein the elongated hole of said electrode means has the following dimensional features:
- aH>2 sg+av
- bv>1.5 av
- bH>av/2
- where av is the height of the straight portion, aH is the width thereof, bv is the height of the broad portions, bH is the width thereof, and sg is the interval at which the electron beams are spaced apart at the elongated hole of said second electrode means.
- 10. A cathode ray tube apparatus, comprising:
- an electron gun assembly, having three gun axes aligned in a horizontal plane;
- means for generating horizontal and vertical-deflection magnetic fields to deflect the three electron beams emitted from the electron gun assembly in both the horizontal plane and a vertical plane, the horizontal-deflection magnetic field being formed as a pincushion-shaped field; and
- a phosphor screen for emitting red, green and blue light rays, when the deflected electron beams impinge thereon;
- said gun assembly including:
- three cathodes arranged in in-line alignment for emitting three electron beams along the three gun axes, respectively;
- control electrode means, including first, second and third grids, each having three round holes, for accelerating and controlling the three electron beams emitted by said cathodes, and for causing each of the three electron beams to cross their respective gun axis to thereby define a dot-like first cross-over on each of the gun axes;
- first electrode means for guiding the three electron beams and for causing each of the three electron beams to cross their respective gun axis in the vertical plane to thereby define a line-like second cross-over extending in the horizontal plane on each of the gun axes, the first electrode means including a fourth grid having three round holes for guiding the three electron beams, respectively, a fifth grid having first and second plates having a space therebetween, the first plate having three round holes for guiding the three electron beams, respectively, and the second plate having a hole elongated in the horizontal direction, for guiding the three electron beams, the fifth grid being applied with a potential varied in accordance with the horizontal or vertical deflection of the electron beams and the fourth grid and a sixth grid being held at a predetermined potential, thereby shifting the line-like second cross-overs on the gun axes; and
- second electrode means one through hole for guiding the three electron beams, for focusing the electron beams emerging from the line-like second cross-overs and also for converging the electron beams while the beams are traveling toward the phosphor screen;
- wherein said first and second electrode means correct for deflection and distortion that is caused by said pincushion-shaped field.
- 11. The electron gun assembly according to claim 10, wherein the elongated hole of the fifth grid has a straight portion having a predetermined width and two broad portions contiguous with the straight portion.
- 12. The electron gun assembly according to claim 11, wherein the elongated hole of the fifth grid has the following dimensional features:
- aH>2 sg+av
- bv>1.5 av
- bH>av/2
- where av is the height of the straight portion, aH is the width thereof, bv is the height of the broad portions, bH is the width thereof, and sg is the interval at which the electron beams are spaced apart at the fifth grid.
- 13. A cathode ray tube apparatus, comprising:
- an electron gun assembly, having three gun axes aligned in a horizontal plane;
- means for generating horizontal and vertical-deflection magnetic fields to deflect the three electron beams emitted from the electron gun assembly in both the horizontal plane and a vertical plane, the horizontal-deflection magnetic field being formed in a pincushion type; and
- means for emitting red, green and blue light rays, when the deflected electron beams impinge thereon;
- said electron gun assembly including:
- three cathodes in in-line alignment for emitting three electron beams along the three gun axes, respectively;
- control electrode means, including first, second and third grids, each having three round holes for accelerating and controlling the electron beams which have been emitted by said cathodes, and causing each of the three electron beams to cross their respective gun axis to thereby define a dot-like first cross-over on each of the gun axes;
- first electrode lens means for guiding the three electron beams and causing each of the three electron beams to cross their respective gun axis in the vertical plane, thereby defining a line-like second cross-over extending in the horizontal plane on each of the gun axes, the first electrode means including a fourth grid having three round holes for guiding the three electron beams, respectively, a fifth grid having first and second plates with a space therebetween, the first plate having three round holes for guiding the three electron beams, respectively, and the second plate having a hole elongated in the horizontal direction, for guiding the three electron beams, a sixth grid having a hole elongated in the horizontal direction, and an auxiliary grid located between the fifth grid and the sixth grid and having a hole elongated in the horizontal direction for guiding the three electron beams, the auxiliary grid being applied with a potential that is varied in accordance with the horizontal or vertical deflection of the electron beams, and the fourth, fifth and sixth grids being held at a predetermined potential, thereby shifting each of the line-like second cross-overs on each of the gun axes; and
- second electrode lens means having one through holes for guiding the three electron beams, for focusing the electron beams emerging from the line-like second cross-overs and also converging the electron beams while the beams are traveling toward the phosphor screen;
- wherein said first and second electrode lens means correct for deflection and distortion that is caused by said pincushion-shaped field.
- 14. The electron gun assembly according to claim 13, wherein the elongated hole of the fifth grid has a straight portion having a predetermined width and two broad portions contiguous with the straight portion.
- 15. The electron gun assembly according to claim 14, wherein the elongated hole of the fifth grid has the following dimensional features:
- aH>2 sg+av
- bv>1.5 av
- bH>av/2
- where av is the height of the straight portion, Ah is the width thereof, bv is the height of the broad portions, bH is the width thereof, and sg is the interval at which the electron beams are spaced apart at the fifth grid.
Priority Claims (2)
Number |
Date |
Country |
Kind |
1-69320 |
Mar 1989 |
JPX |
|
1-257091 |
Oct 1989 |
JPX |
|
Parent Case Info
This is a continuation of application Ser. No. 07/497,917, filed on Mar. 23, 1990, which was abandoned upon the filing hereof.
US Referenced Citations (10)
Foreign Referenced Citations (5)
Number |
Date |
Country |
0104674 |
Apr 1984 |
EPX |
0231964 |
Aug 1987 |
EPX |
57-30247 |
Feb 1982 |
JPX |
61-74246 |
Apr 1986 |
JPX |
1-29298 |
Jun 1989 |
JPX |
Continuations (1)
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Number |
Date |
Country |
Parent |
497917 |
Mar 1990 |
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