Abstract:
A cathode ray tube includes a phosphor screen and an electron gun. The electron gun includes an indirectly heated cathode structure and plural grid electrodes in axially spaced relationship. The cathode structure includes a base metal having an electron emissive material coating and a heater for heating the base metal. The heater includes a major heating portion having a spirally wound heating wire and leg portions disposed at ends of the major heating portion, and each of the leg portions includes a first multilayer winding portion having heating wires wound spirally in plural layers and a second multilayer winding portion disposed intermediate between the major heating portion and the first multilayer winding portion and having heating wires wound in plural layers. The major heating portion and at least a portion of the second multilayer winding portion are covered with an insulating coating, the heater is welded to electrical conductors for applying a voltage thereto at the first multilayer winding portion, and the number of layers in the second multilayer winding portion is at least three and the number of layers in the first multilayer winding portion is larger than that in the second multilayer winding portion.
Abstract:
This invention relates to an indirectly-heated cathode heater structure comprising a heat generation section disposed inwardly of an upper portion of a sleeve for generating heat to emit thermions at an electron gun of a cathode ray tube, the heat generation section having a given calorific value being formed to have a length 25.about.33 % of the length of the sleeve, whereby heat loss at a lower portion of the sleeve during heating operation of the heater may be minimized, resulting in improving an overshoot rate of the heater.
Abstract:
A cathode ray tube includes a phosphor screen (4) and an electron gun (9). The electron gun (9) includes an indirectly heated cathode structure (21) and plural grid electrodes in axially spaced relationship. The cathode structure includes a base metal (27) having an electron emissive material coating (26) and a heater (25) for heating the base metal (27). The heater (25) includes a major heating portion HM having a spirally wound heating wire and leg portions HL disposed at ends of the major heating portion HM, and each of the leg porstions HL includes a first multilayer winding portion having heating wires wound spirally in plural layers and a second multilayer winding portion disposed intermediate between the major heating portion HM and the first multilayer winding portion and having heating wires wound in plural layers. The major heating portion HM and at least a portion of the second multilayer winding portion are covered with an insulating coating, the heater is welded to electrical conductors for applying a voltage thereto at the first multilayer winding portion, and the number of layers in the second multilayer winding portion is at least three and the number of layers in the first multilayer winding portion is larger than that in the second multilayer winding portion.
Abstract:
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.