Corona charging apparatus
AssigneeDennison Manufacturing Company
InventorsHarold W. Cobb, Richard A. Fotland
Life of this patent
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Abstract
A corona charging device including a dielectric-coated elongate conductor contacting or closely spaced from a grid electrode, mounted against an insulating support. A high voltage varying potential between the elongate conductor and grid electrode induces a glow discharge in the vicinity of the dielectric-coated electrode. The grid electrode may act as a ground plane to provide a corona discharge device with respect to a proximate member. Alternatively, the grid electrode may be maintained at a desired potential to provide a charging device with an automatically limited voltage.
Claims27
Apparatus for generating ions, comprising:
- an elongate conductor;
- a dielectric sheath for said elongate conductor;
- an insulating support for the elongate conductor and dielectric sheath;
- a conductive grid contacting said dielectric sheath;
- a varying potential applied between said elongate conductor and said conductive grid in order to create a glow discharge;
- and
- means for extracting ions from said glow discharge.
A method for corona discharging comprising the steps of
- disposing a corona device near the member to be discharged, said corona device comprising an elongate conductor, a dielectric sheath for the elongate conductor, an insulating support for the elongate conductor and dielectric sheath, and a conductive grid contacting the dielectric sheath;
- applying a varying potential between said elongate conductor and conductive grid;
- and
- grounding said conductive grid to a counterelectrode for the member to be discharged.
An electrostatic charging method, comprising the steps of:
- disposing a corona device near the member to be charged, said corona device comprising an elongate conductor, a dielectric sheath for the elongate conductor, an insulating support for the elongate conductor and dielectric sheath, and a conductive grid contacting the dielectric sheath;
- applying a varying potential between said elongate conductor and conductive grid;
- and
- applying an extraction potential between said conductive grid and a counterelectrode for the member to be discharged.
Dependencies are inferred from the claim text.