US3729649A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Corona charging apparatus
Assignee: Eastman Kodak Co
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Filing: 1972-05-25
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Granted: 1973-04-24
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Expires: 1992-05-25
Abstract
Abstract Corona charging apparatus for uniformly charging the surface of a dielectric layer supported on a grounded conductive backing. Such apparatus comprises a flexible corona discharge wire which is perpendicularly arranged, in a cantilever fashion, relative to the central portion of the surface being charged, the free end portion of such wire extending toward such surface. An electrically biased corona-control electrode, positioned between the free end of the corona discharge wire and the dielectric surface, serves to control the level and uniformity of charge received by the dielectric surface. When connected to an appropriate voltage source, the free end of the corona discharge wire becomes charge-emitting and, due to the field established between it and the combination of the control electrode and the conducting backing of the dielectric layer, oscillates in a random manner, thereby uniformly charging the dielectric surface to a level proportional to the electrical bias of the control electrode.
Inventors
- 👤 P Chappelle
- 👤 M Mosehauer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 06:10
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/02; G03G15/0291
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
85 words
Corona charging apparatus for substantially uniformly charging a dielectric surface to a predefined charge level; said apparatus comprising a. a flexible wire, perpendicularly arranged relative to said surface and mounted in a cantilever fashion such that the free end thereof extends toward and is spaced from said surface; b. means for simultaneously generatiNg ions from said free end and causing said free end to move in a random manner relative to said dielectric surface; and c. means for attracting said ions toward said dielectric surface.
Claim 2
Dependent Claim
85 words
Corona charging apparatus for substantially uniformly charging a dielectric surface to a predefined charge level; said apparatus comprising a. a flexible wire, perpendicularly arranged relative to said surface and mounted in a cantilever fashion such that the free end thereof extends toward and is spaced from said surface; b. means for simultaneously generatiNg ions from said free end and causing said free end to move in a random manner relative to said dielectric surface; and c. means for attracting said ions toward said dielectric surface.
Claim 3
Dependent Claim
24 words
The invention according to claim 1 wherein said attracting means comprises means for preventing the charging of said surface beyond said predefined charge level.
Claim 4
Dependent Claim
29 words
The invention according to claim 2 wherein said attracting means comprises a conductive electrode positioned in a plane between said free end of said wire and said dielectric surface.
Claim 5
Dependent Claim
13 words
The invention according to claim 3 wherein said electrode comprises a conductive grid.
Claim 6
Dependent Claim
21 words
The invention according to claim 3 wherein said electrode comprises a conductive band which at least partially surrounds said dielectric surface.
Claim 7
Dependent Claim
129 words
Corona charging apparatus for substantially uniformly charging a dielectric surface to a predefined charge level, said apparatus comprising: a. a flexible wire, perpendicularly arranged relative to said surface and mounted in a cantilever fashion such that the free end thereof extends toward and is spaced from said surface; b. a corona-control electrode, positioned between the free end of said wire and said surface; c. means for generating a corona discharge between the free end of said wire and said electrode while causing said free end to oscillate randomly relative to said surface, whereby said dielectric surface receives a charge; and d. means for electrically biasing said electrode at a level proportional to said predefined charge level, thereby limiting the maximum charge on said surface to said predefined charge level.
Claim 8
Dependent Claim
129 words
Corona charging apparatus for substantially uniformly charging a dielectric surface to a predefined charge level, said apparatus comprising: a. a flexible wire, perpendicularly arranged relative to said surface and mounted in a cantilever fashion such that the free end thereof extends toward and is spaced from said surface; b. a corona-control electrode, positioned between the free end of said wire and said surface; c. means for generating a corona discharge between the free end of said wire and said electrode while causing said free end to oscillate randomly relative to said surface, whereby said dielectric surface receives a charge; and d. means for electrically biasing said electrode at a level proportional to said predefined charge level, thereby limiting the maximum charge on said surface to said predefined charge level.
Claim 9
Dependent Claim
14 words
The invention according to claim 6, wherein said corona-control electrode comprises a conductive grid.
Claim 10
Dependent Claim
17 words
The invention according to claim 6 wherein said corona-control electrode comprises an endless loop of conductive material.
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) | 1976-04-23 | 1976-10-23 | 1977-04-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-23 | 1980-10-23 | 1981-04-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-23 | 1984-10-23 | 1985-04-24 | $7700.00 | Window Closed / Lapsed |