Corona charging apparatus

Details Corona charging apparatus Corona charging apparatus

G - Physics

03

G

317/3, 314/39

G03G 15/02 (2006.01) H01T 19/00 (2006.01)

Patent

CA 1176695

CORONA CHARGING APPARATUS ABSTRACT OF THE DISCLOSURE A corona charging device includes a dielectric-coated elongate conductor contacting or closely spaced from a control electrode. In the first version of this device, the control electrode comprises a conductive grid, which is mounted against an insulating support and in a second version, the control electrode consists of a slotted conductor, with the dielectric-coated elongate conductor embedded in a slot. A high voltage varying potential between the elongate conductor and control electrode induces a glow discharge in an air region in proximity to the two conductors. The control electrode may act as a grounding member to provide a corona discharge device with respect to a proximate surface or alternatively, the control electrode may be maintained at a desired potential to provide a charging device with an automatically limited voltage. The corona charging devices of the invention are characterized by a linear relationship between output ion currents and a direct current extraction potential. In further versions of the second corona device, the slotted conductor and dielectric-coated conductor may be replaced with alternative structures which provide an equivalent enclosure.

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