Method for devacuating a vacuum tube
AssigneeRCA Corporation
InventorGeorge Ernest Eiwen
Life of this patent
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Abstract
In a method for devacuating a vacuum tube to atmospheric pressure, a pulsed beam of radiant energy, such as a laser beam, is directed upon an area of the glass neck portion of the tube that is opposite and closely spaced from a surface structure of the mount assembly in the tube, so that volatilized material that is swept into the tube condenses on and sticks to the surface structure.
Claims1
In a method for devacuating an evacuated electron tube to atmospheric pressure, said tube comprising an envelope having a glass neck portion and, housed in said neck portion, a mount assembly including a surface structure opposite and closely spaced from an area of said neck portion,
- said method including the step of directing a pulsed beam of radiant energy incident upon an external surface area of said glass neck portion until a crater is formed in said neck portion and the glass material at the bottom of said crater volatilizes and is swept into said envelope and condenses therein;
- the improvement comprising
- applying said beam to an area of said neck portion that is opposite and closely spaced from said surface structure comprising said mount assembly so that volatilized material that is swept into said tube condenses on and sticks to said surface structure of said mount assembly, said surface structure being spaced no further than 250 mils from the inner surface of said glass neck portion.
Dependencies are inferred from the claim text.