Method of manufacturing cathode ray tube
AssigneeNEC Corporation
InventorToshio Kaihara
Life of this patent
Estimating the term…
Abstract
In order to heat a field emission type cold cathode 10 of a cathode ray tube, which generates electron beams, to a temperature high enough to obtain a desired electron emission characteristics of the field emission type cold cathode even when an inner temperature distribution of an evacuating furnace 20, which includes furnace temperature setting heaters 21 and a vacuum pump 23, is not uniform, the field emission type cold cathode 10 of an electron gun 3 of the cathode ray tube, which is provided within a neck portion 2a of a bulb 2 of the cathode ray tube, is locally heated by a neck heater 22 detachably mounted on an outer peripheral surface of the neck portion 2a while the bulb 2 is being evacuated.
Claims3
A method of manufacturing a cathode ray tube including a field emission type cold cathode as an electron beam source, comprising a step of heating the cathode ray tube as a whole and a step of locally heating the field emission type cold cathode provided in a neck portion of a bulb of the cathode ray tube.
Dependencies are inferred from the claim text.