(19)
(11) EP 0 000 789 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
07.03.1979 Bulletin 1979/05

(43) Date of publication A2:
21.02.1979 Bulletin 1979/04

(21) Application number: 78100651

(22) Date of filing: 11.08.1978
(84) Designated Contracting States:
BE CH DE FR GB NL SE

(30) Priority: 12.08.1977 US 824252

(71) Applicant: Dennison Manufacturing Company
 ()

(72) Inventors:
  • Fotland, Richard, A.
     ()
  • Carrish, Jeffrey, J.
     ()

   


(54) Method and apparatus for generating charged particles


(57) Generation of charged partides, e.g. ions, by extracting them from a high density source provided by an electrical gas breakdown in an electric field between two conducting electrodes separated by an insulator. When a high frequency electric field is applied, surprisingly high ion current densities can be obtained, providing numerous advantages over conventional ion forming techniques for use in electrostatic printing and office copying.






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