| 摘要 |
PURPOSE: A cathode ray tube is provided to maintain superior color purity characteristics by minimizing mis-landing of electron beam by earth magnetism. CONSTITUTION: A cathode ray tube comprises a panel(20) having a screen part(20a) with a phosphor screen, and a side surface(20b) formed along the circumference of the screen part; a funnel(22) installed to the panel, and which has a deflection device(26) installed at the outer periphery of the funnel; a neck(24) connected to the funnel, and which has an electron gun(28) installed within the neck so as to generate electron beams; a color discrimination unit(30) for color discrimination of electron beams emitted from the electron gun, and which includes a mask(32) and a frame(34), wherein the mask has a plurality of electron beam passing holes and a longer axis and a shorter axis, and the frame is arranged to correspond to the longer axis of the mask and has a pair of supporting members(34a) coupled to the mask and a pair of strengthening members(34b) fixed at both ends of support members so as to maintain the tension applied to the mask; and a shield member connected to the color discrimination unit, and disposed toward the neck and along the circumference of the frame so as to shield an earth magnetism influencing on the track of electron beams. The shield member is expanded toward the phosphor screen further than the front end of the color discrimination unit directed toward the phosphor screen, at one of the longer side or shorter side of the frame.
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