CATHODE RAY TUBE HAVING ELECTRON BEAM GUN PROVIDED WITH HIGH EFFICIENCY HEATER USING COIL WOUND AT HEATING PART AND BUFFERING PART WITH DIFFERENT PITCH

摘要

PURPOSE: A cathode ray tube having an electron beam gun provided with a high efficiency heater is provided to improve performance by winding a coil at a heating part and a buffering part with a different pitch. CONSTITUTION: A heating part(HP) converts electric energy into heat by a resistivity of a coil(420) wound on the heating part with a pitch(d), thereby transferring the heat to a cathode. The pitch of the coil wound on the heating part is identical to the conventional pitch. Therefore, the heating part provides high heat efficiency. A buffering part(BP) has a heat focusing function less than that of the heating part. A winding direction of a coil to be wound at the buffering part is identical to that of the coil wound at the heating part. The coil to be wound at the buffering part has a pitch(e) larger than the pitch of the coil wound at the heating part.