Color cathode ray tube capable of reducing stress
View Patent ↗A color cathode ray tube has features to decrease mechanical stress due to internal pressure made by evacuation. The cathode ray tube includes a panel on an inner surface of which a phosphor screen is formed. A funnel is joined to the panel. An electron gun generates electron beams, and a deflection yoke is mounted within the funnel to deflect the electron beams. The panel satisfies a condition: L 1 +(L 2 −L 1 )×0.35≦L≦L 1 +(L 2 −L 1 )×0.45, and more preferably a condition: L 1 +(L 2 −L 1 )×0.35≦L<L 1 +(L 2 −L 1 )×0.45, wherein L 1 is a distance between an inner center P of said panel and a yoke line plane; L 2 is a distance between the inner center P of said panel and a neck line plane; and L is a distance between the inner center P of said panel and a reference line plane.
1. A cathode ray tube comprising:
a panel on an inner surface of which a phosphor screen is formed;
a funnel joined to the panel;
an electron gun generating electron beams; and
a deflection yoke which is mounted within the funnel to deflect the electron beams, wherein
said panel satisfies a condition:
L 1+( L 2 −L 1)×0.35 ≦L<L 1+( L 2 −L 1)×0.45, wherein
L 1 is a distance between an inner center P of said panel and a yoke line plane; L 2 is a distance between the inner center P of said panel and a neck line plane; and L is a distance between the inner center P of said panel and a reference line plane.
2. The cathode ray tube of claim 1 , wherein
said panel satisfies a condition:
TAN −1 ( D/L )≧1.05, wherein
D is a distance between the inner center P of said panel and a diagonal end of an effective screen.
3. The color cathode ray tube of claim 1 , wherein
a deflection angle is in the range of 120° to 135°.
4. The cathode ray tube of claim 1 , wherein
a cross section of yoke portion of said funnel has substantially a rectangular shape.
5. The cathode ray tube of claim 1 , wherein
said funnel satisfies a condition:
Rdi/Rdo ≦0.54
wherein a deflection axis means an extension line of the central axis of the electron gun through the screen, a yoke line plane means a vertical plane which is perpendicular to the deflection axis and includes a boundary line between the body and yoke portions of the funnel, Rdo is a radius of curvature at one outer corner of a cross section of the yoke line plane of said funnel, and Rdi is a radius of curvature at one inner corner of the cross section.
6. The cathode ray tube of claim 1 , wherein
said panel satisfies a condition:
CFT/SET ≦1.04
wherein CFT is a thickness of a central portion of said panel and SET is a thickness of a skirt portion of said panel.
7. The cathode ray tube of claim 5 , wherein
said panel satisfies a condition:
CFT/SET ≦1.04
wherein CFT is a thickness of a central portion of said panel and SET is thickness of a skirt portion of said panel.
8. The cathode ray tube of claim 1 , wherein
a wedge ratio of said panel is no smaller than 1.5,
wherein the wedge ratio is b/a, b is a thickness of the panel at a corner portion, and a is a thickness of the panel at a central portion.
9. The cathode ray tube according to claim 1 , wherein
an outer surface of said panel is substantially flat.
10. The cathode ray tube according to claim 1 , wherein an outer surface of said panel is substantially flat.
11. A cathode ray tube comprising:
a panel on an inner surface of which a phosphor screen is formed;
a funnel joined to the panel;
an electron gun generating electron beams; and
a deflection yoke which is mounted within the funnel to deflect the electron beams, wherein
said panel satisfies a condition:
L 1+( L 2 −L 1)×0.35 ≦L≦L 1+( L 2 −L 1)×0.45, wherein
L 1 is a distance between an inner center P of said panel and a yoke line plane; L 2 is a distance between the inner center P of said panel and a neck line plane; and L is a distance between the inner center P of said panel and a reference line plane, and wherein
said funnel satisfies a condition:
Rdi/Rdo 0.54
wherein a deflection axis means an extension line of the central axis of the electron gun through the screen, a yoke line plane means a vertical plane which is perpendicular to the deflection axis and includes a boundary line between the body and yoke portions of the funnel, Rdo is a radius of curvature at one outer corner of a cross section of the yoke line plane of said funnel, and Rdi is a radius of curvature at one inner corner of the cross section.
12. The cathode ray tube of claim 11 , wherein
said panel satisfies a condition:
TAN −1 ( D/L )≧1.05, wherein
D is a distance between the inner center P of said panel and a diagonal end of an effective screen.
13. The color cathode ray tube of claim 11 , wherein
a deflection angle is in the range of 120° to 135°.
14. The cathode ray tube of claim 11 , wherein
a cross section of a yoke portion of said funnel has substantially a rectangular shape.
15. The cathode ray tube of claim 11 , wherein
a wedge ratio of said panel is no smaller than 1.5,
wherein the wedge ratio is b/a, b is a thickness of the panel at a corner portion, and a is a thickness of the panel at a central portion.
16. The cathode ray tube of claim 11 , wherein
said panel satisfies a condition:
CFT/SET ≦1.04
wherein CFT is a thickness of a central portion of said panel and SET is a thickness of a skirt portion of said panel.
17. The cathode ray tube of claim 11 , wherein
said panel satisfies a condition:
CFT/SET ≦1.04
wherein CFT is a thickness of a central portion of said panel and SET is thickness of a skirt portion of said panel.