Claims
- 1. A color cathode-ray tube comprising:
- an envelope having a panel portion, a neck portion, and a funnel portion coupling the panel portion and the neck portion to each other;
- an electron gun mounted within the neck portion for producing electron beams;
- a phosphor screen formed on an inner surface of the panel portion; and
- a shadow mask having a plurality of holes therein and disposed opposing the phosphor screen so that the electron beams pass through holes in the shadow mask to impinge on the phosphor screen;
- wherein the holes are arranged with a varying arrangement pitch, the varying arrangement pitch being monotonically non-decreasing from a central portion to two opposite peripheral portions of the shadow mask as viewed, in a horizontal direction in the color cathode-ray tube, at an arbitrary position on the shadow mask in a vertical direction in the color cathode-ray tube;
- wherein an increase of the varying arrangement pitch in the horizontal direction is substantially zero in first regions from the central portion to intervening portions between the central portion and the two opposite peripheral portions of the shadow mask;
- wherein an increase of the varying arrangement pitch in the horizontal direction has a gradient not smaller than zero in second regions from the intervening portions toward the two opposite peripheral portions of the shadow mask;
- wherein a distance between the central portion and each of the two opposite peripheral portions of the shadow mask is L.sub.x ;
- wherein a distance between the central portion and each of the intervening portions is at least L.sub.x /3 and not more than 2L.sub.x /3;
- wherein the varying arrangement pitch at the central portion is Ph.sub.0 ;
- wherein the varying arrangement pitch in the first regions is at least Ph.sub.0 and not greater than 1.005 Ph.sub.0 ;
- wherein a radius of curvature of a cross-section of the shadow mask taken along the horizontal direction is substantially constant in the first regions from the central portion to the intervening portions, and gradually decreases in the second regions from the intervening portions toward the two opposite peripheral portions of the shadow mask;
- wherein the radius of curvature is R1 at the central portion, substantially R1 at the intervening portions, and R2 at the two opposite peripheral portions of the shadow mask;
- wherein R1/R2.gtoreq.1.98; and
- wherein the varying arrangement pitch at each of the two opposite peripheral portions of the shadow mask is not smaller than substantially 1.0 Ph.sub.0 and is not larger than substantially 1.25 Ph.sub.0.
- 2. A color cathode-ray tube comprising:
- an envelope having a panel portion, a neck portion, and a funnel portion coupling the panel portion and the neck portion to each other;
- an electron gun mounted within the neck portion for producing electron beams;
- a phosphor screen formed on an inner surface of the panel portion; and
- a shadow mask having a plurality of holes therein and disposed opposing the phosphor screen so that the electron beams pass through holes in the shadow mask to impinge on the phosphor screen;
- wherein the holes are arranged with a varying arrangement pitch, the varying arrangement pitch being monotonically non-decreasing from a central portion to two opposite peripheral portions of the shadow mask as viewed, in a horizontal direction in the color cathode-ray tube at an arbitrary position on the shadow mask in a vertical direction in the color cathode-ray tube;
- wherein an increase of the varying arrangement pitch in the horizontal direction is substantially zero in first regions from the central portion to intervening portions between the central portion and the two opposite peripheral portions of the shadow mask;
- wherein an increase of the varying arrangement pitch in the horizontal direction has a gradient not smaller than zero in second regions from the intervening portions toward the two opposite peripheral portions of the shadow mask;
- wherein a distance between the central portion and each of the two opposite peripheral portions of the shadow mask is L.sub.x ;
- wherein a distance between the central portion and each of the intervening portions is at least L.sub.x /3 and not more than 2L.sub.x /3;
- wherein the varying arrangement pitch at the central portion is Ph.sub.0 ;
- wherein the varying arrangement pitch in the first regions is at least Ph.sub.0 and not greater than 1.005 Ph.sub.0 ;
- wherein a radius of curvature of a cross-section of the shadow mask taken along the horizontal direction is substantially constant in the first regions from the central portion to the intervening portions, and gradually decreases in the second regions from the intervening portions toward the two opposite peripheral portions of the shadow mask; and
- wherein the varying arrangement pitch at each of the two opposite peripheral portions of the shadow mask is not smaller than substantially 1.1 Ph.sub.0 and is not larger than substantially 1.25 Ph.sub.0.
- 3. A color cathode-ray tube according to claim 2, wherein the panel portion has a width and a height, the width being greater than the height.
- 4. A color cathode-ray tube according to claim 2, wherein each of the holes is circular.
- 5. A color cathode-ray tube comprising:
- an envelope having a panel portion, a neck portion, and a funnel portion coupling the panel portion and the neck portion to each other;
- an electron gun mounted within the neck portion for producing electron beams;
- a phosphor screen formed on an inner surface of the panel portion; and
- a shadow mask having a plurality of holes therein and disposed opposing the phosphor screen so that the electron beams pass through holes in the shadow mask to impinge on the phosphor screen;
- wherein the holes are arranged with a varying arrangement pitch, the varying arrangement pitch being monotonically non-decreasing from a central portion to two opposite peripheral portions of the shadow mask as viewed, in a horizontal direction in the color cathode-ray tube, at an arbitrary position on the shadow mask in a vertical direction in the color cathode-ray tube;
- wherein an increase of the varying arrangement pitch in the horizontal direction is substantially zero in first regions from the central portion to intervening portions between the central portion and the two opposite peripheral portions of the shadow mask;
- wherein an increase of the varying arrangement pitch in the horizontal direction has a gradient not smaller than zero in second regions from the intervening portions toward the two opposite peripheral portions of the shadow mask;
- wherein a distance between the central portion and each of the two opposite peripheral portions of the shadow mask is L.sub.x ;
- wherein a distance between the central portion and each of the intervening portions is at least L.sub.x /3 and not more than 2L.sub.x /3;
- wherein the varying arrangement pitch at the central portion is Ph.sub.0 ;
- wherein the varying arrangement pitch in the first regions is at least Ph.sub.0 and not greater than 1.005 Ph.sub.0 ;
- wherein a radius of curvature of a cross-section of the shadow mask taken along the horizontal direction is substantially constant in the first regions from the central portion to the intervening portions, and gradually decreases in the second regions from the intervening portions toward the two opposite peripheral portions of the shadow mask;
- wherein the radius of curvature is R1 at the central portion, substantially R1 at the intervening portions, and R2 at the two opposite peripheral portions of the shadow mask; and
- wherein R1/R2.gtoreq.198.
- 6. A color cathode-ray tube according to claim 5, wherein the panel portion has a width and a height, the width being greater than the height.
- 7. A color cathode-ray tube according to claim 5, wherein each of the holes is circular.
- 8. A shadow mask for use in a color cathode-ray tube, the shadow mask comprising:
- a metal plate in which a plurality of holes are formed for passage of electron beams therethrough in the color cathode-ray tube, the holes being arranged with a varying arrangement pitch, the varying arrangement pitch being monotonically non-decreasing from a central portion to two opposite peripheral portions of the shadow mask as viewed, in a first direction conforming with a horizontal direction in the color cathode-ray tube, at an arbitrary position on the shadow mask in a second direction perpendicular to the first direction;
- wherein an increase of the varying arrangement pitch in the first direction is substantially zero in first regions from the central portion to intervening portions between the central portion and the two opposite peripheral portions of the shadow mask;
- wherein an increase of the varying arrangement pitch in the first direction has a gradient not smaller than zero in second regions from the intervening portions toward the two opposite peripheral portions of the shadow mask;
- wherein a distance between the central portion and each of the two opposite peripheral portions of the shadow mask is L.sub.x ;
- wherein a distance between the central portion and each of the intervening portions is at least L.sub.x /3 and not more than 2L.sub.x /3;
- wherein the varying arrangement pitch at the central portion is Ph.sub.0 ;
- wherein the varying arrangement pitch in the first regions is at least Ph.sub.0 and not greater than 1.005 Ph.sub.0 ;
- wherein a radius of curvature of a cross-section of the shadow mask taken along the first direction is substantially constant in the first regions from the central portion to the intervening portions, and gradually decreases in the second regions from the intervening portions toward the two opposite peripheral portions of the shadow mask;
- wherein the radius of curvature is R1 at the central portion, substantially R1 at the intervening portions, and R2 at the two opposite peripheral portions of the shadow mask; and
- wherein R1/R2.gtoreq.1.98.
- 9. A shadow mask according to claim 8, wherein the shadow mask has a width and a height, the width being greater than the height.
- 10. A shadow mask according to claim 8, wherein each of the holes is circular.
- 11. A shadow mask for use in a color cathode-ray tube, the shadow mask comprising:
- a metal plate in which a plurality of holes are formed for passage of electron beams therethrough in the color cathode-ray tube, the holes being arranged with a varying arrangement pitch, the varying arrangement pitch being monotonically non-decreasing from a central portion to two opposite peripheral portions of the shadow mask as viewed, in a first direction conforming with a horizontal direction in the color cathode-ray tube, at an arbitrary position on the shadow mask in a second direction perpendicular to the first direction;
- wherein an increase of the varying arrangement pitch in the first direction is substantially zero in first regions from the central portion to intervening portions between the central portion and the two opposite peripheral portions of the shadow mask;
- wherein an increase of the varying arrangement pitch in the first direction has a gradient not smaller than zero in second regions from the intervening portions toward the two opposite peripheral portions of the shadow mask;
- wherein a distance between the central portion and each of the two opposite peripheral portions of the shadow mask is L.sub.x ;
- wherein a distance between the central portion and each of the intervening portions is at least L.sub.x /3 and not more than 2L.sub.x /3;
- wherein the varying arrangement pitch at the central portion is P.sub.0 ;
- wherein the varying arrangement pitch in the first regions is at least Ph.sub.0 and not greater than 1.005 Ph.sub.0 ;
- wherein a radius of curvature of a cross-section of the shadow mask taken along the first direction is substantially constant in the first regions from the central portion to the intervening portions, and gradually decreases in the second regions from the intervening portions toward the two opposite peripheral portions of the shadow mask; and
- wherein the varying arrangement pitch at each of the two opposite peripheral portions of the shadow mask is not smaller than substantially 1.1 Ph.sub.0 and is not larger than substantially 1.25 Ph.sub.0.
- 12. A shadow mask according to claim 11, wherein the shadow mask has a width and a height, the width being greater than the height.
- 13. A shadow mask according to claim 11, wherein each of the holes is circular.
- 14. A shadow mask for use in a color cathode-ray tube, the shadow mask comprising:
- a metal plate in which a plurality of holes are formed for passage of electron beams therethrough in the color cathode-ray tube, the holes being arranged with a varying arrangement pitch, the varying arrangement pitch being monotonically non-decreasing from a central portion to two opposite peripheral portions of the shadow mask as viewed, in a first direction conforming with a horizontal direction in the color cathode-ray tube, at an arbitrary position on the shadow mask in a second direction perpendicular to the first direction;
- wherein an increase of the varying arrangement pitch in the first direction is substantially zero in first regions from the central portion to intervening portions between the central portion and the two opposite peripheral portions of the shadow mask;
- wherein an increase of the varying arrangement pitch in the first direction has a gradient not smaller than zero in second regions from the intervening portions toward the two opposite peripheral portions of the shadow mask;
- wherein a distance between the central portion and each of the two opposite peripheral portions of the shadow mask is L.sub.x ;
- wherein a distance between the central portion and each of the intervening portions is at least L.sub.x /3 and not more than 2L.sub.x /3;
- wherein the varying arrangement pitch at the central portion is Ph.sub.0 ;
- wherein the varying arrangement pitch in the first regions is at least Ph.sub.0 and not greater than 1.005 Ph.sub.0 ;
- wherein a radius of curvature of a cross-section of the shadow mask taken along the first direction is substantially constant in the first regions from the central portion to the intervening portions, and gradually decreases in the second regions from the intervening portions toward the two opposite peripheral portions of the shadow mask;
- wherein the radius of curvature is R1 at the central portion, substantially R1 at the intervening portions, and R2 at the two opposite peripheral portions of the shadow mask;
- wherein R1/R2.gtoreq.1.98; and
- wherein the varying arrangement pitch at each of the two opposite peripheral portions of the shadow mask is not smaller than substantially 1.1 Ph.sub.0 and is not larger than substantially 1.25 Ph.sub.0.
Priority Claims (1)
Number |
Date |
Country |
Kind |
5-060432 |
Mar 1993 |
JPX |
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CROSS-REFERENCE TO RELATED APPLICATION
This is a continuation of application Ser. No. 08/214,278 filed on Mar. 17, 1994 now U.S. Pat. No. 5,633,558.
US Referenced Citations (6)
Foreign Referenced Citations (3)
Number |
Date |
Country |
0146926 |
Jul 1985 |
EPX |
0239083 |
Sep 1987 |
EPX |
59-165341 |
Sep 1984 |
JPX |
Non-Patent Literature Citations (1)
Entry |
Patent Abstracts of Japan, vol. 13, No. 298 (E-784) �3646!, Jul. 10, 1989 (for Japanese Kokai 1-77841 published on Mar. 23, 1989). |
Continuations (1)
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Number |
Date |
Country |
Parent |
214278 |
Mar 1994 |
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