Patent US3742237A successfully refreshed from Google Patents.
US3742237A
Expired / Lapsed
US
⏱️ 0.0 years remaining
A. c. corona charging apparatus
Assignee: Xerox Corp
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Filing: 1971-04-21
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Granted: 1973-06-26
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Expires: 1991-04-21
Abstract
Abstract A method of increasing the current flow from an a.c. corona charging apparatus and the apparatus therefor are provided in accordance with the teachings of the present invention. According to one embodiment of this invention a.c. corona charging apparatus is provided with a corona discharge electrode and a dielectric shield disposed in partially surrounding relationship with respect to said corona discharge electrode. Conductive means is mounted on the external surface of said dielectric shield such that said conductive shield is contiguous with and collateral with said dielectric shield. The conductive means is adapted to be supplied with a reference potential such that when a corona generating a.c. voltage is applied to said corona discharge electrode an a.c. corona current is produced having a magnitude significantly in excess of that heretofore obtainable.
Inventors
- 👤 D Parker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 13:26
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/02; G03G15/0291
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
78 words
A method of increasing the current flow from the corona discharge electrode of an a.c. corona charging apparatus having a dielectric shield partially surrounding said corona discharge electrode and a surface, comprising the steps of: providing a conductive layer in contact with the external surface of said dielectric shield, said conductive layer being collateral with said dielectric shield; applying a reference potential to said conductive layer; and supplying said corona discharge electrode with a corona generating a.c. voltage.
Claim 2
Independent Claim
78 words
A method of increasing the current flow from the corona discharge electrode of an a.c. corona charging apparatus having a dielectric shield partially surrounding said corona discharge electrode and a surface, comprising the steps of: providing a conductive layer in contact with the external surface of said dielectric shield, said conductive layer being collateral with said dielectric shield; applying a reference potential to said conductive layer; and supplying said corona discharge electrode with a corona generating a.c. voltage.
Claim 3
Dependent Claim
25 words
The method of claim 1 wherein said step of applying a reference potential to said conductive layer comprises applying ground potential to said conductive layer.
Claim 4
Dependent Claim
30 words
The method of claim 1 wherein said step of applying a reference potential to said conductive layer comprises applying a d.c. voltage exhibiting a constant magnitude to said conductive layer.
Claim 5
Dependent Claim
87 words
An a.c. corona discharge device, comprising: an elongated corona discharge electrode; a dielectric shield disposed in partially surrounding relationship with respect to said elongated corona discharge electrode, said dielectric shield being coextensive with said elongated corona discharge electrode; a layer of conductive material in contact with the external surface of said dielectric shield, said conductive means being collateral with said dielectric shield; means for applying a reference potential to said conductive means; and means for supplying said elongated corona discharge electrode with a corona generating a.c. voltage.
Claim 6
Dependent Claim
87 words
An a.c. corona discharge device, comprising: an elongated corona discharge electrode; a dielectric shield disposed in partially surrounding relationship with respect to said elongated corona discharge electrode, said dielectric shield being coextensive with said elongated corona discharge electrode; a layer of conductive material in contact with the external surface of said dielectric shield, said conductive means being collateral with said dielectric shield; means for applying a reference potential to said conductive means; and means for supplying said elongated corona discharge electrode with a corona generating a.c. voltage.
Claim 7
Dependent Claim
123 words
Apparatus for applying an a.c. corona current to a surface, comprising: corona discharge electrode means supported in spaced registration from said surface; a dielectric shield disposed in partially surrounding relationship with respect to said corona discharge electrode means such that a corona current path is defined between said corona discharge electrode means and said surface, the interior surface Of said dielectric shield comprising the first plate of a parallel plate capacitor; conductive means in contact with the exterior surface of said dielectric shield and collateral therewith, said conductive means comprising the second plate of a parallel plate capacitor; means for applying a reference voltage to said conductive means; and means for applying a corona generating a.c. voltage to said corona discharge electrode means.
Claim 8
Dependent Claim
123 words
Apparatus for applying an a.c. corona current to a surface, comprising: corona discharge electrode means supported in spaced registration from said surface; a dielectric shield disposed in partially surrounding relationship with respect to said corona discharge electrode means such that a corona current path is defined between said corona discharge electrode means and said surface, the interior surface Of said dielectric shield comprising the first plate of a parallel plate capacitor; conductive means in contact with the exterior surface of said dielectric shield and collateral therewith, said conductive means comprising the second plate of a parallel plate capacitor; means for applying a reference voltage to said conductive means; and means for applying a corona generating a.c. voltage to said corona discharge electrode means.
Claim 9
Dependent Claim
135 words
Apparatus for applying an a.c. corona current to a surface, comprising: corona discharge electrode means; parallel plate capacitance means disposed in partially surrounding relationship with respect to said corona discharge electrode means, said parallel plate capacitance means including a first plate comprised of the interior surface of a dielectric shield and a second plate comprised of conductive means in contact with the exterior surface of said dielectric shield; means for applying a reference voltage to said conductive means; and means for applying a corona generating a.c. voltage to said corona discharge electrode means whereby an a.c. corona current is generated when the difference between the corona generating a.c. voltage applied to said corona discharge electrode means and the voltage induced on the first plate of said parallel plate capacitance means exceeds the corona threshold voltage.
Claim 10
Dependent Claim
135 words
Apparatus for applying an a.c. corona current to a surface, comprising: corona discharge electrode means; parallel plate capacitance means disposed in partially surrounding relationship with respect to said corona discharge electrode means, said parallel plate capacitance means including a first plate comprised of the interior surface of a dielectric shield and a second plate comprised of conductive means in contact with the exterior surface of said dielectric shield; means for applying a reference voltage to said conductive means; and means for applying a corona generating a.c. voltage to said corona discharge electrode means whereby an a.c. corona current is generated when the difference between the corona generating a.c. voltage applied to said corona discharge electrode means and the voltage induced on the first plate of said parallel plate capacitance means exceeds the corona threshold voltage.
Claim 11
Dependent Claim
77 words
The apparatus of claim 6 wherein the separation between said first and second plates of said parallel plate capacitance means is from about 0.25 to 10 mils whereby the capacitance of said parallel plate capacitance means is such that the rate of change of the voltage induced on the first plate of said parallel plate capacitance means is less than the rate of change of the corona generating a.c. voltage applied to said corona discharge electrode means.
References Cited (Backward Citations)
US3164074A
Cited
US3374348A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-06-25 | 1976-12-25 | 1977-06-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-25 | 1980-12-25 | 1981-06-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-25 | 1984-12-25 | 1985-06-26 | $7700.00 | Window Closed / Lapsed |