US3813547A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Corona generating apparatus
Assignee: Xerox Corp
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Filing: 1972-08-23
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Granted: 1974-05-28
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Expires: 1992-08-23
Abstract
Abstract Improved corona generating methods and apparatus therefor are provided in accordance with the teachings of this invention wherein a medium in relative motion with a charging station may be rapidly charged to a desired potential in a highly efficient manner. According to one embodiment of the present invention, corona charging apparatus including at least one coronode and having a shield associated therewith is provided and operated in such manner that current flow in the shield is maintained above a selected minimum level during the operation of the corona charging apparatus. The selected minimum level of current flow in the shield is of such value that the coronode will initially supply ion current with a substantially lower threshold energizing potential applied thereto than would be otherwise available and the directivity of the selected minimum level of current flow is such that the potential established at the shield will ensure that a majority of the ion charging current produced at the coronode is delivered to the medium to be charged.
Inventors
- 👤 M Silverberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 14:07
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/02; G03G15/0291
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
142 words
Compact corona generating apparatus for applying ion charging current to a medium to be charged comprising: a substantially planar conductive substrate extending in a longitudinal direction; a substantially planar insulating member disposed on a surface of said conductive substrate and also extending in said longitudinal direction, said conductive substrate projecting beyond at least onE edge of said insulating member in a direction normal to said longitudinal direction to provide an exposed conductive substrate portion; and coronode means extending in said longitudinal direction and positioned in a closely spaced relationship to said surface of said conductive substrate on which said insulating member is disposed, said coronode means being physically separated from said conductive substrate by at least said insulating member, said physical separation being substantially smaller than the distance between said coronode means and the nearest said exposed portion of said conductive substrate.
Claim 2
Dependent Claim
142 words
Compact corona generating apparatus for applying ion charging current to a medium to be charged comprising: a substantially planar conductive substrate extending in a longitudinal direction; a substantially planar insulating member disposed on a surface of said conductive substrate and also extending in said longitudinal direction, said conductive substrate projecting beyond at least onE edge of said insulating member in a direction normal to said longitudinal direction to provide an exposed conductive substrate portion; and coronode means extending in said longitudinal direction and positioned in a closely spaced relationship to said surface of said conductive substrate on which said insulating member is disposed, said coronode means being physically separated from said conductive substrate by at least said insulating member, said physical separation being substantially smaller than the distance between said coronode means and the nearest said exposed portion of said conductive substrate.
Claim 3
Dependent Claim
139 words
Corona generating apparatus for applying ion charging current to a medium to be charged comprising: insulating means extending in a longitudinal direction; a conductive stripe disposed on one surface of said insulating means and also extending in said longitudinal direction; coronode means extending in said longitudinal direction and positioned in a closely spaced relationship to another surface of said insulating means opposite to that upon which said conductive stripe is disposed, said coronode means and said conductive stripe displaying greater electrical dynamic impedance characteristics than would otherwise be associated with the physical spacing therebetween; and means electrically connected to said conductive stripe to maintain a predetermined minimum current in said conductive stripe of a value sufficient to cause a major portion of the ion current flow from the coronode means to be delivered to said medium to be charged.
Claim 4
Dependent Claim
139 words
Corona generating apparatus for applying ion charging current to a medium to be charged comprising: insulating means extending in a longitudinal direction; a conductive stripe disposed on one surface of said insulating means and also extending in said longitudinal direction; coronode means extending in said longitudinal direction and positioned in a closely spaced relationship to another surface of said insulating means opposite to that upon which said conductive stripe is disposed, said coronode means and said conductive stripe displaying greater electrical dynamic impedance characteristics than would otherwise be associated with the physical spacing therebetween; and means electrically connected to said conductive stripe to maintain a predetermined minimum current in said conductive stripe of a value sufficient to cause a major portion of the ion current flow from the coronode means to be delivered to said medium to be charged.
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) | 1977-05-27 | 1977-11-26 | 1978-05-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-05-27 | 1981-11-26 | 1982-05-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-05-27 | 1985-11-26 | 1986-05-28 | $7700.00 | Window Closed / Lapsed |