Color cathode ray tube
View Patent ↗The present invention relates to a color cathode ray tube and more specifically to a color cathode ray tube in which mechanical stress due to internal pressure made by evacuation is decreased. According to an aspect of the present invention, a cathode ray tube includes a panel on inner surface of which a phosphor screen is formed, a funnel joined to the panel, and an electron gun generating electron beams wherein the panel satisfies a condition: CFT/SET≦0.92 wherein CFT is thickness of central portion of the panel and SET is thickness of skirt portion of the panel.
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; and
an electron gun generating electron beams,
wherein said panel satisfies a condition:
0.78 ≦CFT/SET ≦0.92, and
wherein the CFT is a thickness of a central portion of said panel and the SET is a thickness of a skirt portion of said panel.
2. The cathode ray tube of claim 1 ,
wherein a wedge ratio of said panel is no smaller than 1.5, and
wherein the wedge ratio is defined as b/a, b is a thickness of the panel at a corner portion and a is the thickness of the panel at the central portion.
3. The color cathode ray tube of claim 1 ,
wherein said panel satisfies a condition:
OAH/SET≦ 9.2, and
wherein the OAH is overall height of said panel and the SET is the thickness of the skirt portion of said panel.
4. The cathode ray tube of claim 1 , wherein a cross section of a yoke portion of said funnel has a substantially rectangular shape.
5. The cathode ray tube according to claim 1 , wherein an outer surface of said panel is substantially flat.