US4227233A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Corona discharge device for electrographic apparatus
Assignee: Olympus Corp
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Filing: 1977-09-30
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Granted: 1980-10-07
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Expires: 1997-09-30
Abstract
Abstract A corona discharge device for electrographic apparatus which makes use of a drum-shaped photosensitive screen. The device is provided with a corona electric field establishing electrode extending in parallel with a corona discharge wire and supplied with an electric potential which is intermediate the electric potential of a field electrode and the electric potential of the corona discharge wire.
Inventors
- 👤 Masaji Nishikawa
- 👤 Muneo Kasuga
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 03:21
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/02; G03G15/0291; H; H01; H01T; H01T19/00
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
169 words
In a corona discharge device for electrographic apparatus employing a corona discharge wire, a field electrode for establishing a backing electric field and a high voltage source connected between said corona discharge wire and said field electrode, the improvement comprising: two corona electric field establishing electrodes (5, 5; 13, 13) are provided without any other electrically conductive electrode, said two electrodes (5, 5; 13, 13) being formed of two thin bar-shaped conductors, spaced apart from each other and arranged between said corona discharge wire (1) and said field electrode (3) in such a position that a flow of corona ions directed from said corona discharge wire (1) directly toward said field electrode (3) passes between said two electrodes (5, 5; 13, 13) without being disturbed by said two electrodes (5, 5; 13, 13), and means for applying an electrical potential intermediate between a potential of said corona discharge wire (1) and a potential of said field electrode (3) to said corona electric field establishing electrodes (5, 5; 13, 13).
Claim 2
Dependent Claim
169 words
In a corona discharge device for electrographic apparatus employing a corona discharge wire, a field electrode for establishing a backing electric field and a high voltage source connected between said corona discharge wire and said field electrode, the improvement comprising: two corona electric field establishing electrodes (5, 5; 13, 13) are provided without any other electrically conductive electrode, said two electrodes (5, 5; 13, 13) being formed of two thin bar-shaped conductors, spaced apart from each other and arranged between said corona discharge wire (1) and said field electrode (3) in such a position that a flow of corona ions directed from said corona discharge wire (1) directly toward said field electrode (3) passes between said two electrodes (5, 5; 13, 13) without being disturbed by said two electrodes (5, 5; 13, 13), and means for applying an electrical potential intermediate between a potential of said corona discharge wire (1) and a potential of said field electrode (3) to said corona electric field establishing electrodes (5, 5; 13, 13).
Claim 3
Dependent Claim
38 words
The device according to claim 1 wherein said means comprises an auxiliary high voltage source connected between said corona electric field-establishing electrode and said field electrode for applying said intermediate electric potential to said corona electric field-establishing electrode.
Claim 4
Dependent Claim
37 words
The device according to claim 1 wherein said means comprises a high voltage resistor connected between said corona electric field-establishing electrode and said field electrode for applying said intermediate electric potential to said corona electric field-establishing electrode.
Claim 5
Dependent Claim
38 words
The device according to claim 1 wherein said means comprises an aerial discharge device connected between said corona electric field-establishing electrode and said field electrode and applying said intermediate electric potential to said corona electric field establishing electrode.
Claim 6
Dependent Claim
44 words
The device according to claim 4, wherein said aerial discharge device comprises a needle electrode having one end connected to said corona electric field establishing electrode, the other end of said needle electrode being opposite to said field electrode with a discharge gap therebetween.
Claim 7
Dependent Claim
38 words
The device according to claim 4, wherein said aerial discharge device comprises an auxiliary corona discharge device having a shield electrode connected to said corona electric field-establishing electrode and a corona discharge wire connected to said field electrode.
Claim 8
Dependent Claim
72 words
The device according to claim 1 further comprising two insulating members for shielding that flow of corona ions which is directed from said corona discharge wire 1 through the outside of said two corona electric field establishing electrodes 5, 5; 13, 13 toward said field electrode 3 and arranged at both sides of and extending parallel to said corona discharge wire and arranged adjacent to said two corona electric field-establishing electrodes, respectively.
Claim 9
Dependent Claim
101 words
The device according to claim 1 further comprising a channel-shaped insulating member for shielding that flow of corona ions which is directed from said corona discharge wire 1 through the outside of said two corona electric fields establishing electrodes 5, 5; 13, 13 toward said field electrode 3 and arranged parallel with said corona discharge wire in surrounding relation therewith, said insulating member having parallel legs with free edges defining an open end for the channel-shaped insulating member, said two corona electric field-establishing electrodes being arranged adjacent to said free edges at said open end of said channel-shaped insulating member, respectively.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-10-07 | 1984-04-07 | 1984-10-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-10-07 | 1988-04-07 | 1988-10-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-10-07 | 1992-04-07 | 1992-10-07 | $7700.00 | Window Closed / Lapsed |