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US4379969A
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Corona charging apparatus
Assignee: Delphax Systems Inc
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Filing: 1981-02-24
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Granted: 1983-04-12
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Expires: 2001-02-24
Abstract
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.
Inventors
- 👤 Harold W. Cobb
- 👤 Richard A. Fotland
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 07:41
CPC Classifications
H; H05; H05F; H05F3/00; H01; H01T; H01T19/00; H01T19/04
Claims Analysis
Total Claims: 30
Claim 1
Independent Claim
60 words
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.
Claim 2
Dependent Claim
60 words
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.
Claim 3
Dependent Claim
15 words
Apparatus as defined in claim 1 wherein the conductive grid comprises a conductive mesh electrode.
Claim 4
Dependent Claim
16 words
Apparatus as defined in claim 2 wherein the conductive mesh electrode comprises a wire mesh screen.
Claim 5
Dependent Claim
21 words
Apparatus as defined in claim 3 wherein the wire mesh screen has a mesh in the range 30-150 apertures per inch.
Claim 6
Dependent Claim
17 words
Apparatus as defined in claim 3 wherein the wire mesh electrode has a high open area ratio.
Claim 7
Dependent Claim
24 words
Apparatus as defined in claim 3 wherein the wire mesh screen comprises a lattice of wires having a thickness in the range 0.3-1.2 mils.
Claim 8
Dependent Claim
20 words
Apparatus as defined in claim 2 wherein the conductive mesh electrode comprises a metal foil etched in a mesh pattern.
Claim 9
Dependent Claim
17 words
Apparatus as defined in claim 1 wherein the conductive grid comprises an array of essentially parallel conductors.
Claim 10
Dependent Claim
22 words
Apparatus as defined in claim 1 wherein the conductive grid contacts the dielectric sheath along a line coextensive with the elongate conductor.
Claim 11
Dependent Claim
17 words
Apparatus as defined in claim 1 wherein the elongate conductor and dielectric sheath comprise a dielectric-coated wire.
Claim 12
Dependent Claim
18 words
Apparatus as defined in claim 10 wherein the dielectric sheath has a thickness in the range 1-3 mils.
Claim 13
Dependent Claim
26 words
Apparatus as defined in claim 1 wherein the elongate conductor and dielectric sheath comprise a conductive strip contacting the insulating support, with an encapsulating dielectric layer.
Claim 14
Dependent Claim
15 words
Apparatus as defined in claim 1 wherein the dielectric sheath comprises an inorganic dielectric material.
Claim 15
Dependent Claim
25 words
Apparatus as defined in claim 13 wherein the dielectric sheath comprises a material selected from the class consisting of glass, mica, and sintered ceramic materials.
Claim 16
Dependent Claim
26 words
Apparatus as defined in claim 1 wherein the conductive grid is anchored against the insulating support on each side of the elongate conductor and dielectric sheath.
Claim 17
Dependent Claim
16 words
Apparatus as defined in claim 1 wherein the conductive grid has an approximately V-shaped lateral cross-section.
Claim 18
Dependent Claim
15 words
Apparatus as defined in claim 1 wherein the conductive grid has an arcuate lateral cross-section.
Claim 19
Dependent Claim
22 words
Apparatus as defined in claim 1 wherein the extracting means comprises a direct current potential between the conductive grid and a counterelectrode.
Claim 20
Dependent Claim
20 words
Apparatus as defined in claim 18 wherein the direct current potential has a magnitude of tens to hundreds of volts.
Claim 21
Dependent Claim
39 words
Apparatus as defined in claim 1, for corona discharging, wherein the apparatus is proximate to an imaging surface to be discharged, said imaging surface having a backing electrode, and wherein said conductive grid is grounded to said backing electrode.
Claim 22
Dependent Claim
16 words
Apparatus as defined in claim 1 wherein the varying potential comprises a high voltage alternating potential.
Claim 23
Dependent Claim
19 words
Apparatus as defined in claim 21 wherein the alternating potential has a frequency in the range 60 Hz-4 MHz.
Claim 24
Dependent Claim
14 words
Apparatus as defined in claim 1 wherein the varying potential comprises a pulsed voltage.
Claim 25
Dependent Claim
28 words
Apparatus as defined in claim 1, wherein the conductive grid is disposed at a distance in the range 5-20 mils from a member to be charged or discharged.
Claim 26
Dependent Claim
33 words
Apparatus as defined in claim 1 wherein the elongate conductor and dielectric sheath are housed in a slot in said insulating support, with said conductive grid contacting the dielectric sheath above the slot.
Claim 27
Independent Claim
76 words
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.
Claim 28
Independent Claim
76 words
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.
Claim 29
Dependent Claim
79 words
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.
Claim 30
Dependent Claim
79 words
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.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-04-11 | 1986-10-11 | 1987-04-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-04-11 | 1990-10-11 | 1991-04-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-04-11 | 1994-10-11 | 1995-04-12 | $7700.00 | Window Closed / Lapsed |