Frame assembly in flat cathode ray tube

Abstract

Frame assembly in a flat cathode ray tube, the flat cathode ray tube including a panel glass 1 having a fluorescent material coated on an inside surface, a funnel glass 2 fixed to rear of the panel glass 1 having a neck portion formed as one unit with an electron gun sealed therein for emission of electron beams 6 toward the fluorescent material, a deflection yoke 5 fitted on an outer circumference of the neck portion for deflection of the electron beams 6 emitted from the electron gun, a shadow mask 3 fitted to an inside surface of the panel glass 1 having a plurality of apertures for selecting colors, and a frame assembly 7 having a main frame 7a fitted to the shadow mask 3 and a subframe 7b connecting both ends of the main frame 7a, wherein a ratio of second moment of inertia(Ixx/Izz) of the subframe 7b is designed to be within 0.5˜2.7 for avoiding a resonance between the frame assembly 7 and the shadow mask 3, thereby preventing occurrence of howling, effectively.

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