Patents Represented by Attorney Edwin T. Grimms

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  • Field emission gun electrode geometry for improved focus stability
    Patent number: 4695773
    Abstract: In field emission systems having beam current regulation by use of modulating field strengths from a control or Wehnelt electrode adjacent the emission electrode, the varying field strengths produce a focus instability of the emitted beam. By the precise spacing of the emission tip, Wehnelt electrode and first accelerating electrode, and by the precise aperture diameters of the Wehnelt and first accelerating electrodes, the beam focus remains stabilized for modulating field strength variations.
    Type: Grant
    Filed: April 16, 1984
    Date of Patent: September 22, 1987
    Assignee: The Perkin-Elmer Corporation
    Inventors: Lee H. Veneklasen, Guy G. Yagunoff