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Dynamic focusing electron gun

  • US 5,025,189 A
  • Filed: 11/03/1989
  • Issued: 06/18/1991
  • Est. Priority Date: 11/05/1988
  • Status: Expired due to Term
First Claim
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1. A dynamic focusing electron gun for producing a plurality of electron beams comprising a triode including a plurality of cathodes, a control grid, and a screen grid, and a main lens means including a plurality of electrodes for forming a dynamic quadrupole focusing lens for focusing the electron beams, said main lens means comprising a first focusing electrode disposed proximate said screen grid, a second focusing electrode disposed proximate a final acceleration anode, a static potential electrode disposed proximate said first focusing electrode, and a dynamic potential electrode, said static potential electrode and dynamic potential electrode being disposed between said first and second focusing electrodes and forming the dynamic quadrupole lens wherein said static potential electrode includes vertically elongate electron beam passing exit holes for passage of the electron beams out of said static potential electrode toward said dynamic potential electrode and said dynamic potential electrode includes laterally elongate electron beam passing entrance holes for passage of the electron beams into said dynamic potential electrode from said static potential electrode.

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