Electron gun with a multi-element electron lens
AssigneeRCA Corporation
InventorFrancis Joseph Campbell
Life of this patent
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Abstract
The disclosed apparatus is a multiple beam electron gun having a wide focusing lens gap. The lens gap has a plurality of metal elements, spaced therein, each successive element of which has a successively greater voltage applied to it. The application of the voltages creates an electrostatic field which focuses a plurality of beams generated by the gun.
Claims8
In an electron gun structure for producing and directing at least one electron beam along a beam path, said gun including a cathode, a control grid electrode, a screen grid electrode, a first accelerating and focusing electrode and a second accelerating and focusing electrode, spaced respectively along the beam path, the improvement comprising:
- a plurality of spaced electrode plates positioned between said first focusing and accelerating electrode and said second focusing and accelerating electrode for expanding the focusing lens fields in the path of the beam, each plate having an aperture therethrough aligned with said beam path;
- supporting means connecting said electrode plates;
- and
- resistive means attached at one end to said first accelerating and focusing electrode and at a second end to said second focusing and accelerating electrode and attached to said spaced electrode plates at spaced points between the ends of said resistive means, said resistive means being on said support means.
Dependencies are inferred from the claim text.