Color cathode ray tube with inner shield mounted to the frame of the mask
View Patent ↗The present invention relates to a color cathode ray tube and more specifically to a color cathode ray tube in which electron beam landing errors caused by terrestrial magnetism are corrected such that color purity is improved. The color cathode ray tube in accordance with the present invention comprises a panel having a phosphor screen formed on an inner surface thereof; a funnel joined to the panel; an electron gun generating electron beams; a frame mounted to the panel; a shadow mask mounted to the frame; and an inner shield mounted to the frame, wherein ISH/OAH is in a range of 1.8 to 3.0 wherein OAH is a height of the panel and ISH is a height of the inner shield.
1. A color cathode ray tube comprising:
a panel having a phosphor screen formed on an inner surface thereof;
a funnel joined to the panel;
an electron gun generating electron beams;
a frame mounted to the panel;
a shadow mask mounted to the frame; and
an inner shield mounted to the frame, wherein ISH/OAH is in a range of 1.8 to 3.0 where OAH is a height of the panel and ISH is a height of the inner shield.
2. The color cathode ray tube of claim 1 , wherein FRH/OAH is in a range of 0.1 to 0.4, where FRH is a height of the frame.
3. The color cathode ray tube of claim 1 , wherein ISH/FRH is greater than or equal to 5.
4. The color cathode ray tube of claim 3 , wherein an outer surface of said panel is substantially flat.
5. A color cathode ray tube comprising:
a panel having a phosphor screen formed on an inner surface thereof;
a funnel joined to the panel;
an electron gun generating electron beams;
a frame mounted to the panel;
a shadow mask mounted to the frame; and
an inner shield mounted to the frame, wherein FRH/OAH is in a range of 0.1 to 0.4, where OAH is a height of the panel and FRH is a height of the frame.
6. The color cathode ray tube of claim 5 , wherein ISH/FRH is greater than or equal to 5, where ISH is a height of the inner shield.
7. The color cathode ray tube of claim 5 , wherein an outer surface of said panel is substantially flat.