Manufacture of electron tube for impregnated cathod
专利汇可以提供Manufacture of electron tube for impregnated cathod专利检索，专利查询，专利分析的服务。并且PURPOSE:To prevent oxidation of the cathode of an electron tube, by sealing the electron tube after replacing the gas nearby the cathode with nonoxidizable gas introduced into a neck tube having a vent hole. CONSTITUTION:A vacuum exhaust tube 6 on which a cathode 1, a heater 2 and an electrode are fixed is inserted into a neck tube 8 provided with a vent hole 13. The vacuum exhaust tube 6 is inserted, setting in a holder 11. Next, after surrounding space gas of the cathode 1 is replaced with nonoxidizable gas such as nitrogen gas, argon gas or the like which is introduced into the neck tube 8 and a Braun tube 7 from the exhaust port 12 of the vacuum exhaust tube 6, the neck tube 8 is sealed by heating the perimeter of a connecting area 9 with a gas burner 10. The oxidation of the coating layer of a coated type impregnate cathode and the vanishment by oxidation hereby disappear, and a good thermion radiation characteristic can be maintained.，下面是Manufacture of electron tube for impregnated cathod专利的具体信息内容。
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