(19)
(11) EP 0 895 867 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
31.03.1999 Bulletin 1999/13

(43) Date of publication A2:
10.02.1999 Bulletin 1999/06

(21) Application number: 98202302.0

(22) Date of filing: 08.07.1998
(51) International Patent Classification (IPC)6: B41J 2/415
(84) Designated Contracting States:
AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE
Designated Extension States:
AL LT LV MK RO SI

(30) Priority: 07.08.1997 EP 97202443

(71) Applicant: AGFA-GEVAERT N.V.
2640 Mortsel (BE)

(72) Inventors:
  • Desie, Guido
    2640 Mortsel (BE)
  • Backeljauw, Frans
    2640 Mortsel (BE)

   


(54) A device for direct electrostatic printing with an edge electrode and an AC-field on the surface of the toner delivery means


(57) A device for direct electrostatic printing is provided comprising means for creating a flow of charged toner particles from a means for delivering charged toner particles, having a surface bearing toner particles, to an image receiving substrate, applying a DC potential difference between the means for delivering charged toner particles and the image receiving substrate and a printhead structure having control electrodes, interposed in the flow of toner particles for image wise controlling the flow of toner particles, the printhead structure controlling the flow of toner particles only from one side, wherein means for applying an AC-field on the surface bearing toner particles are incorporated, AC-field having a frequency between 1.5 and 3 kHz.






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