Cathode ray tube
View Patent ↗The present invention relates to a cathode ray tube, and more particularly, to a funnel for CRT to increase the BSN neck shadow margin by changing the shape of the yoke portion.
1. A cathode ray tube comprising:
a panel being a front glass;
a funnel coupled with the panel to maintain vacuum inside;
a fluorescent screen formed inside the panel;
a shadow mask spaced by a predetermined gap from the fluorescent screen, for selecting colors;
an electron gun installed at a neck of the funnel; and
a deflection yoke for deflecting an electron beam emitted from the electron gun in horizontal and vertical directions,
wherein the funnel at which the deflection yoke is installed is provided with a yoke installation part, and
an outer surface of a shorter side of a cross-section perpendicular to a tube axis of the yoke installation part is protruded toward the tube axis, and has a maximal protruded distance of 1.5 mm or less.
2. The cathode ray tube according to claim 1 , wherein the maximal protruded distance ranges from 0.3 mm to 1.0 mm.
3. The cathode ray tube according to claim 1 , wherein an inner surface of a longer side of the cross-section perpendicular to the tube axis of the yoke installation part is concave toward the tube axis.
4. The cathode ray tube according to claim 1 , wherein two facing inner surfaces of a longer side of the cross-section perpendicular to the tube axis of the yoke installation part are parallel with each other.
5. The cathode ray tube according to claim 1 , wherein an inner surface of the shorter side of the cross-section perpendicular to the tube axis of the yoke installation part is convex toward the tube axis.
6. The cathode ray tube according to claim 1 , wherein an inner surface of the shorter side of the cross-section perpendicular to the tube axis of the yoke installation part is concave toward the tube axis.
7. The cathode ray tube according to claim 1 , wherein curves of two facing inner surfaces of the shorter side of the cross-section perpendicular to the tube axis of the yoke installation part are parallel with each other.
8. The cathode ray tube according to claim 1 , wherein an inner surface of a longer side of the cross-section perpendicular to the tube axis of the yoke installation part is convex toward the tube axis.
9. The cathode ray tube according to claim 1 , wherein an outer surface of a longer side of the cross-section perpendicular to the tube axis of the yoke installation part is concave toward the tube axis.
10. The cathode ray tube according to claim 1 , wherein an outer surface of a longer side of the cross-section perpendicular to the tube axis of the yoke installation part is convex toward the tube axis.
11. The cathode ray tube according to claim 1 , wherein two facing outer surfaces of the longer side of the cross-section perpendicular to the tube axis of the yoke installation part are parallel with each other.
12. The cathode ray tube according to claim 1 , wherein an inner surface of the cross-section perpendicular to the tube axis of the yoke installation part is concave toward the tube axis.
13. The cathode ray tube according to claim 1 , wherein an inner surface of the cross-section perpendicular to the tube axis of the yoke installation part are convex toward the tube axis.
14. The cathode ray tube according to claim 1 , wherein curves of facing inner surfaces of the cross-section perpendicular to the tube axis of the yoke installation part are parallel with each other.
15. A cathode ray tube comprising:
a panel being a front glass;
a funnel coupled with the panel to maintain vacuum inside;
a fluorescent screen formed inside the panel;
a shadow mask spaced by a predetermined gap from the fluorescent screen, for selecting colors;
an electron gun installed at a neck portion of the funnel; and
a deflection yoke for deflecting an electron beam emitted from the electron gun in horizontal and vertical directions,
wherein the funnel at which the deflection yoke is installed is provided with a yoke installation part,
the funnel has a cross-section of which inner shape or outer shape vary from a circle to a non-circle as it goes from the neck to the panel, and
an outer surface of a shorter side of a cross-section perpendicular to a tube axis of the yoke installation part is protruded to the tube axis and has a maximal protruded distance of 1.5 mm or less.
16. The cathode ray tube according to claim 15 , wherein the maximal protruded distance ranges from 0.3 mm to 1.0 mm.
17. The cathode ray tube according to claim 15 , wherein an inner surface of a longer side of the cross-section perpendicular to the tube axis of the yoke installation part is concave toward the tube axis.
18. The cathode ray tube according to claim 15 , wherein two facing inner surfaces of a longer side of the cross-section perpendicular to the tube axis of the yoke installation part are parallel with each other.
19. The cathode ray tube according to claim 15 , wherein an inner surface of the shorter side of the cross-section perpendicular to the tube axis of the yoke installation part is convex toward the tube axis.
20. The cathode ray tube according to claim 15 , wherein an inner surface of the shorter side of the cross-section perpendicular to the tube axis of the yoke installation part is concave toward the tube axis.
21. The cathode ray tube according to claim 15 , wherein curves of two facing inner surfaces of the shorter side of the cross-section perpendicular to the tube axis of the yoke installation part are parallel with each other.
22. The cathode ray tube according to claim 15 , wherein an inner surface of a longer side of the cross-section perpendicular to the tube axis of the yoke installation part is convex toward the tube axis.
23. The cathode ray tube according to claim 15 , wherein an outer surface of a longer side of the cross-section perpendicular to the tube axis of the yoke installation part is concave toward the tube axis.
24. The cathode ray tube according to claim 15 , wherein an outer surface of a longer side of the cross-section perpendicular to the tube axis of the yoke installation part is convex toward the tube axis.
25. The cathode ray tube according to claim 15 , wherein two facing outer surfaces of the longer side of the cross-section perpendicular to the tube axis of the yoke installation part are parallel with each other.
26. The cathode ray tube according to claim 15 , wherein an inner surface of the cross-section perpendicular to the tube axis of the yoke installation part is concave toward the tube axis.
27. The cathode ray tube according to claim 15 , wherein an inner surface of the cross-section perpendicular to the tube axis of the yoke installation part are convex toward the tube axis.
28. The cathode ray tube according to claim 15 , wherein curves of facing inner surfaces of the cross-section perpendicular to the tube axis of the yoke installation part are parallel with each other.
29. The cathode ray tube according to claim 15 , wherein a shape of the cross-section perpendicular to the tube axis of the yoke installation part is rectangular.
30. A cathode ray tube comprising:
a panel being a front glass;
a funnel coupled with the panel to maintain vacuum inside;
a fluorescent screen formed inside the panel;
a shadow mask spaced by a predetermined gap from the fluorescent screen, for selecting colors;
an electron gun installed at a neck portion of the funnel; and
a deflection yoke for deflecting an electron beam emitted from the electron gun in horizontal and vertical directions,
wherein the funnel at which the deflection yoke is installed is provided with a yoke installation part, and
an outer surface of a shorter side of a cross-section perpendicular to a tube axis of the yoke installation part forms a curvature protruded toward the tube axis and has a maximal vertical curvature radius (Rv) of 1900 mm or less.
31. The cathode ray tube according to claim 30 , wherein an outer surface of a shorter side of cross-section perpendicular to a tube axis of the yoke installation part forms a curvature protruded toward the tube axis, and a protruded portion toward the tube axis is formed between a reference line (RL) and a junction portion (TOR: Top of Round) of a yoke installation part of a funnel and a funnel-shaped funnel.
32. The cathode ray tube according to claim 30 , wherein an outer surface of a shorter side of cross-section perpendicular to a tube axis of the yoke installation part forms a curvature protruded toward the tube axis and has a minimal vertical curvature radius (Rv) in the vertical direction of 30 mm or more.
33. The cathode ray tube according to claim 30 , wherein an outer surface of a shorter side of cross-section perpendicular to a tube axis of the yoke installation part forms a curvature protruded toward the tube axis and has a mean curvature radius (Rzs) in the horizontal direction of 100 mm or more.
34. The cathode ray tube according to claim 33 , wherein an outer surface of a longer side of cross-section perpendicular to a tube axis of the yoke installation part forms a curvature protruded toward the tube axis and has a mean curvature radius (Rzs) in the horizontal direction of 110 mm to 130 mm.