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Uniform density charge deposit source

  • US 5,644,223 A
  • Filed: 05/12/1995
  • Issued: 07/01/1997
  • Est. Priority Date: 05/12/1995
  • Status: Expired due to Term
First Claim
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1. A device including a corona discharge gun having a longitudinal, vertical axis and a transverse axis intersecting said longitudinal axis, said gun comprising at least one transversely oriented, biased needle-shaped electrode providing a source of ions of a given polarity at the tip of each said at least one needle-shaped electrode,a biased focusing ring electrode, anda biased masking electrode, said masking electrode comprising a centrally apertured disk,said electrodes being insulated from each other and supported so that said ring electrode and said apertured disk are mutually coaxial with said vertical axis,said ring electrode being positioned intermediate to each said tip and said masking electrode.

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