CATHODE RAY TUBE WITH IMPROVED INDIRECT HEATING CATHODE

摘要

PURPOSE: A cathode ray tube is provided to improve easiness of welding and reliability of the cathode ray tube. CONSTITUTION: A cathode ray tube comprises a phosphor plate and an electron beam. The electron beam includes a plurality of grid electrodes. The cathode structure includes a substrate metal and a heater for heating the metal. The heater includes a leg unit located between a main heater and a section of the main heater. The respective leg units includes heat wires, a first multi layer coil unit, the main heater, and a second multi layer coil unit. At least one section of the main heater and the second multi layer coil unit is covered with an isolation layer, and the heater is welded to electric lines for loading voltage to the first multi layer coil unit. The second multi layer coil unit has at least 3 layers, and the number of layer of the first multi layer coil unit is greater than that of the second multi layer coil unit.