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US 5,453,657 AGranted
Indirectly-heated cathode heater structure for a cathode ray tube
AssigneeGold Star Co., Ltd.
InventorGong S. Park
Life of this patent
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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.
Claims3
An indirectly-heated cathode heater structure for a cathode ray tube, comprising:
- a cathode sleeve having an overall length;
- a heat generation section disposed inwardly of an upper portion of said cathode sleeve for generating heat to emit thermions from thermion emission material positioned proximate a top end of said cathode sleeve, said heat generation section formed to have a length 25.about.33% of said overall length of said cathode sleeve;
- a power input section provided at a lower portion of said heat generation section to supply electric power to said heat generation section;
- and
- a wound calorific wire having a number of turns positioned in said heat generation section and said power input section, such that a distance between each turn of said wound calorific wire in said heat generation section is shorter than a distance between each turn of said wound calorific wire in said power input section.
2 more elements
Dependencies are inferred from the claim text.