Electron gun for color cathode ray tube
View Patent ↗The present invention relates to a cathode ray tube, and more particularly, to a cathode ray tube with reduced stray emissions by improving the electrical conductivity of an electrode material of an electron gun housed in a funnel of the cathode ray tube.
1. A cathode ray tube comprising:
a front glass panel;
a funnel coupled to the panel;
a fluorescent screen formed on an inside surface of the panel;
an electron gun emitting electron beams; and
a deflection yoke deflecting the electron beams emitted from the electron gun to a designated direction, wherein the electron gun comprises a tripolar portion composed of a sequentially disposed at regular intervals, an anode, and a shield cup, and at least one electrode of the electron gun is made of a Fe—Cr—Ni alloy with an electric conductivity higher than 12,200 mho/m.
2. The cathode ray tube according to claim 1 , wherein at least one electrode of the electron gun is made of a Fe—Cr—Ni alloy with an electric conductivity in the range of 12,500-13,500 mho/m.
3. The cathode ray tube according to claim 1 , wherein the Fe—Cr—Ni alloy includes 14-18 wt % of Cr, 12-16 wt % of Ni, less than 1.2 wt % of Mn, and Fe and inevitable impurities for the rest.
4. The cathode ray tube according to claim 1 , wherein the Fe—Cr—Ni alloy contains less than about 0.05 wt % of C.
5. The cathode ray tube according to claim 1 , wherein the Fe—Cr—Ni alloy contains 0.5-1.0 wt % of Mn.
6. The cathode ray tube according to claim 1 , wherein at least one electrode of the plurality of focus electrodes, the anode, and the shield cup of the electron gun is made of a Fe—Cr—Ni alloy with an electric conductivity higher than 12,200 mho/m.
7. The cathode ray tube according to claim 1 , wherein at least one electrode of the electron gun has a thickness of 0.245-1.0 mm.
8. The cathode ray tube according to claim 7 , wherein at least one electrode of the electron gun is in a plate shape having a thickness of 0.4-1.0 mm.
9. The cathode ray tube according to claim 7 , wherein at least one electrode of the electron gun is in a cap shape or a cup shape having a thickness of 0.245-0.5 mm.
10. The cathode ray tube according to claim 1 , wherein at least one electrode of the electron gun has an elongation greater than about 40%.
11. The cathode ray tube according to claim 1 , wherein at least one electrode of the electron gun has a magnetic permeability less than about 1.005.
12. A cathode ray tube, comprising:
a front glass panel;
a funnel coupled to the panel;
a fluorescent screen formed on an inside surface of the panel;
an electron gun emitting electron beams; and
a deflection yoke deflecting the electron beams emitted from the electron gun in a designated direction, wherein the electron gun comprises a tripolar portion composed of a cathode, a control electrode, and an accelerating electrode, a plurality of focus electrodes being sequentially disposed at regular intervals, an anode, and a shield cup, and at least one electrode of the electron gun is made of a Fe—Cr—Ni alloy including 14-18 wt % of Cr, 12-16 wt % of Ni, less than 1.2 wt % of Mn, and Fe and inevitable impurities for the rest.
13. The cathode ray tube according to claim 12 , wherein the Fe—Cr—Ni alloy contains less than about 0.05 wt % of C.
14. The cathode ray tube according to claim 12 , wherein the Fe—Cr—Ni alloy contains 0.5-1.0 wt % of Mn.
15. The cathode ray tube according to claim 12 , wherein at least one electrode of the electron gun is made of a Fe—Cr—Ni alloy with an electric conductivity higher than 12,200 mh o/m.
16. The cathode ray tube according to claim 12 , wherein at least one electrode of the electron gun has a thickness of 0.245-11.0 mm.
17. The cathode ray tube according to claim 16 , wherein at least one electrode of the electron gun is in a plate shape having a thickness of 0.4-1.0 mm.
18. The cathode ray tube according to claim 16 , wherein at least one electrode of the electron gun is in a cap shape or a cup shape having a thickness of 0.245-0.5 mm.
19. The cathode ray tube according to claim 12 , wherein at least one electrode of the electron gun has an elongation greater than about 40%.
20. The cathode ray tube according to claim 12 , wherein at least one electrode of the electron gun has a magnetic permeability less than 1.005.