Color cathode ray tube panel having seal edge corner with a specific curvature
View Patent ↗A color cathode ray tube is capable of reducing a rate of cracks in a furnace and improving the productivity of the CRT by improving a structure of a seal edge of a skirt of a panel. A color cathode ray tube according to the present invention includes a rectangular panel having a substantially vertically extending skirt on inner and outer surfaces of the panel and a funnel coupled to a seal edge of the skirt of the panel. The seal edge of the skirt of the panel has a corner having a specific curvature between a seal surface and a side of the skirt, and the following relationship is satisfied: 0.6 mm<W<1.0 mm, where W is the shortest distance from a starting point on the seal surface of the corner to an extension plane of the side of the skirt.
1. A color cathode ray tube comprising a rectangular panel having a substantially vertically extending skirt on inner and outer surfaces of the panel and a funnel coupled to a seal edge of the skirt of the panel,
wherein the seal edge of the skirt of the panel has a corner having a specific curvature between a seal surface and a side of the skirt, and the following relationship is satisfied:
0.6 mm<W<1.0 mm,
where W is the shortest distance from a starting point on the seal surface of the corner to an extension plane of the side of the skirt.
2. The color cathode ray tube according to claim 1 , wherein the following relationship is satisfied:
0.3 mm<H 2 <0.6 mm,
where H 2 is the shortest distance from a middle portion of the corner to a seal plane.
3. The color cathode ray tube according to claim 1 , wherein the corner includes an inclination portion facing in the direction from the seal surface to the side of the skirt, a middle portion extending substantially parallel to the seal surface from an end portion of the inclination portion to the side of the skirt, and a curvature portion formed to have a specific curvature radius from an end portion of the middle portion to the side of the skirt, the curvature portion being not protruded from at least the middle portion to the seal surface, and
the following relationship is satisfied:
0.1 mm<R<0.6 mm,
where R is a curvature radius of the curvature portion.
4. The color cathode ray tube according to claim 1 , wherein the corner includes an inclination portion facing in the direction from the seal surface to the side of the skirt, a middle portion extending substantially parallel to the seal surface from an end portion of the inclination portion to the side of the skirt, and a curvature portion formed to have a specific curvature radius from an end portion of the middle portion to the side of the skirt, the curvature portion being not protruded from at least the middle portion to the seal surface, and
the following relationships are satisfied:
0.3 mm<H 2 <0.6 mm,
0.1 mm<R<0.6 mm,
where H 2 is the shortest distance from the middle portion of the corner to a seal plane, and R is a curvature radius of the curvature portion.
5. The color cathode ray tube according to claim 1 , wherein the corner having the specific curvature is a single curvature.
6. The color cathode ray tube according to claim 1 , wherein the corner having the specific curvature is a complex curvature.
7. The color cathode ray tube according to claim 1 , wherein the panel has a substantially flat outer surface.
8. The color cathode ray tube according to claim 7 , wherein the panel has an inner surface having a curvature.
9. A color cathode ray tube comprising a rectangular panel having a substantially vertically extending skirt on inner and outer surfaces of the panel and a funnel coupled to a seal edge of the skirt of the panel,
wherein the seal edge of the skirt of the panel has a corner having a specific curvature between a seal surface and a side of the skirt, and the following relationship is satisfied:
0.3 mm<H 2 <0.6 mm,
where H 2 is the shortest distance from a middle portion of the corner to a seal plane.
10. The color cathode ray tube according to claim 9 , wherein the corner includes an inclination portion facing in the direction from the seal surface to the side of the skirt, a middle portion extending substantially parallel to the seal surface from an end portion of the inclination portion to the side of the skirt, and a curvature portion formed to have a specific curvature radius from an end portion of the middle portion to the side of the skirt, the curvature portion being not protruded from at least the middle portion to the seal surface, and
the following relationship is satisfied:
0.1 mm<R<0.6 mm,
where R is a curvature radius of the curvature portion.
11. The color cathode ray tube according to claim 9 , wherein the corner having the specific curvature is a single curvature.
12. The color cathode ray tube according to claim 9 , wherein the corner having the specific curvature is a complex curvature.
13. The color cathode ray tube according to claim 9 , wherein the panel has a substantially flat outer surface.
14. The color cathode ray tube according to claim 13 , wherein the panel has an inner surface having a curvature.
15. A color cathode ray tube comprising a rectangular panel having a substantially vertically extending skirt on inner and outer surfaces of the panel and a funnel coupled to a seal edge of the skirt of the panel,
wherein the seal edge of the skirt of the panel has a corner having a specific curvature between a seal surface and a side of the skirt,
the corner includes an inclination portion facing in the direction from the seal surface to the side of the skirt, a middle portion extending substantially parallel to the seal surface from an end portion of the inclination portion to the side of the skirt, and a curvature portion formed to have a specific curvature radius from an end portion of the middle portion to the side of the skirt,
the curvature portion being not protruded from at least the middle portion to the seal surface, and
the following relationship is satisfied:
0.1 mm<R<0.6 mm,
where R is a curvature radius of the curvature portion.
16. The color cathode ray tube according to claim 15 , wherein the corner having the specific curvature is a single curvature.
17. The color cathode ray tube according to claim 15 , wherein the corner having the specific curvature is a complex curvature.
18. The color cathode ray tube according to claim 15 , wherein the panel has a substantially flat outer surface.
19. The color cathode ray tube according to claim 18 , wherein the panel has an inner surface having a curvature.