Cathode ray tube with improved thickness profile
View Patent ↗Disclosed is a cathode ray tube, comprising a panel of which outer surface is substantially flat and inner surface has a designated radius of curvature, a funnel connected to the panel, an electron gun housed in the funnel, emitting electron beams, a deflection yoke for deflecting the electron beams, and a shadow mask for discriminating the electron beams in colors, wherein a ratio (%) of a corner portion of the panel to a thickness at a central portion of the panel is in a range of 150%˜230%, and design sizes of the panel satisfy a relation of CFT × USD IBRD × 100 ≤ 1100 mm (wherein, CFT denotes a thickness at the central portion of the panel, USD denotes a diagonal length of an effective surface of the panel, and IBRD denotes 2×a distance from the center of the panel to the center of a radius of curvature from the corner portion of the panel).
1. A cathode ray tube, comprising a panel of which outer surface is substantially flat and inner surface has a designated radius of curvature, a funnel connected to the panel, an electron gun housed in the funnel, emitting electron beams, a deflection yoke for deflecting the electron beams, and a shadow mask for discriminating the electron beams in colors, wherein a ratio (%) of a thickness at a corner portion of the panel to a central portion of the panel is in a range of 150%˜230%, and design sizes of the panel satisfy a relation of
CFT
×
USD
IBRD
×
100
≤
1100
mm
wherein CFT denotes a thickness at the central portion of the panel, USD denotes a diagonal length of an effective surface of the panel, and IBRD denotes 2×a distance from the center of the panel to the center of a radius of curvature from the corner portion of the panel.
2. The cathode ray tube according to claim 1 , wherein the design sizes of the panel satisfy a relation of
750
mm
≤
CFT
×
USD
IBRD
×
100
≤
1100
mm
wherein CFT denotes a thickness at the central portion of the panel, USD denotes a diagonal length of an effective surface of the panel, and IBRD denotes 2×a distance from the center of the panel to the center of a radius of curvature from the corner portion of the panel.
3. The cathode ray tube according to claim 1 , wherein the panel satisfies a condition of
99
%
≤
IBRD
USD
×
100
%
wherein USD denotes a diagonal length of an effective surface of the panel, and IBRD denotes 2×a distance from the center of the panel to the center of a radius of curvature from the corner portion of the panel.
4. The cathode ray tube according to claim 1 , wherein the panel satisfies a condition of
99
%
≤
IBRD
USD
×
100
%
≤
102.5
%
wherein USD denotes a diagonal length of an effective surface of the panel, and IBRD denotes 2×a distance from the center of the panel to the center of a radius of curvature from the corner portion of the panel.
5. The cathode ray tube according to claim 1 , wherein the panel satisfies a condition of 5.8 mm≦R wherein R denotes a radius of curvature of the end portion of the effective surface of the panel of the corner portion of the panel.
6. The cathode ray tube according to claim 1 , wherein the panel satisfies a condition of 5.8 mm≦R≦10.0 mm wherein R denotes a radius of curvature of the end portion of the effective surface of the panel of the corner portion of the panel.
7. The cathode ray tube according to claim 1 , wherein a radius of curvature of the inner surface of the panel in a diagonal direction is in a range of 1000 mm –2000 mm.
8. The cathode ray tube according to claim 1 , wherein a radius of curvature of the outer surface of the panel in a diagonal direction is 3000 mm or more.
9. The cathode ray tube according to claim 1 , wherein the diagonal length of the effective surface of the panel is 500 mm or less.
10. The cathode ray tube according to claim 1 , wherein the cathode ray tube is for use in a computer monitor.