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US3619609A
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US
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Corona discharge device for electrophotography employing interleaved discharge electrode elements and counter electrode elements
Assignee: Katsuragawa Electric Co Ltd
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Filing: 1969-11-21
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Granted: 1971-11-09
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Expires: 1989-11-21
Abstract
Abstract In a corona discharge device for electrophotography comprising a corona discharge electrode and a counter electrode for depositing electric charge on a photosensitive element upon which a light image is projected through the corona discharge device, both the corona discharge electrode and counter electrode are composed of parallel conductors which are moved at high speed while the light image is being projected upon the photosensitive element through the corona discharge device to eliminate the effect of the shadow thereof.
Inventors
- 👤 Shiro Uehara
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 18:40
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/02; G03G15/0291
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
157 words
In a corona discharge device comprising a discharge electrode and a counter electrode and used for electrophotography in which a light image is projected upon a photosensitive element through said corona discharge device concurrently with the deposition of charge on the surface of said photosensitive element, the improvement wherein said corona discharge device comprises a plurality of spaced apart parallel fine metal wires which are supported by a frame in a common plane uniformly spaced apart and parallel to the surface of said photosensitive element, a plurality of spaced apart parallel strip shaped counter electrodes supported by said frame, said counter electrodes interleaving with said metal wires and being substantially perpendicular to the surface of said photosensitive element, and means for rapidly reciprocating said corona discharge device relative to said photosensitive element in a direction substantially parallel to the surface thereof while said light image is being projected upon said photosensitive element through said corona discharge device.
Claim 2
Dependent Claim
41 words
The corona discharge device as defined in claim 2 wherein said parallel fine metal wires are spaced apart from each other by a definite spacing and said parallel fine metal wires are shifted a distance equal to at least said spacing.
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) | 1974-11-08 | 1975-05-10 | 1975-11-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-08 | 1979-05-10 | 1979-11-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-08 | 1983-05-10 | 1983-11-09 | $7700.00 | Window Closed / Lapsed |