Patent US3777158A successfully refreshed from Google Patents.
US3777158A
Expired / Lapsed
US
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Corona discharge device for electrophotography
Assignee: Konica Minolta Inc
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Filing: 1972-01-13
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Granted: 1973-12-04
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Expires: 1992-01-13
Abstract
Abstract Corona discharge devices for electrophotography, comprising means to control the flow of the ion wind (which is understood to be an air stream induced by ion flow) so as to exhaust the same through an opening other than that where the photosensitive paper is charged, and to prevent blowing of the ion wind against the paper. Alternatively means are provided for preventing the ion wind from flowing out of the charging opening.
Inventors
- 👤 N Kamogawa
- 👤 H Fujii
- 👤 T Uchida
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 09:22
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/02; G03G15/0258
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
201 words
A corona discharge device for electrophotography having corona discharge electrodes for charging of a photosensitive paper spaced therefrom, comprising a plurality of plate means encompassing said electrodes on three sides thereof in a generally U-shaped arrangement, said plate means including a conductive back plate behind the electrodes and a pair of side plates flanking said electrodes extending from said back plate so as to define a first opening along the surface of said photosensitive paper facing the electrodes, second openings formed between said back plate and said pair of side plates, said side plates each including diverging and rearwardly extending elongate baffle plate means adjacent said second openings projecting in directions away from said photosensitive paper, said conductive back plate being positioned at a shorter distance from said electrodes than the distance between the latter and the photosensitive paper so as to cause an ion wind generated by an electric field within the device, upon a high voltage being supplied to said electrodes, to flow toward said back plate and through said second openings along said baffle plates, said baffle plates preventing return flow of said ion wind egressing from said second openings toward said first opening and said photosensitive paper.
Claim 2
Dependent Claim
201 words
A corona discharge device for electrophotography having corona discharge electrodes for charging of a photosensitive paper spaced therefrom, comprising a plurality of plate means encompassing said electrodes on three sides thereof in a generally U-shaped arrangement, said plate means including a conductive back plate behind the electrodes and a pair of side plates flanking said electrodes extending from said back plate so as to define a first opening along the surface of said photosensitive paper facing the electrodes, second openings formed between said back plate and said pair of side plates, said side plates each including diverging and rearwardly extending elongate baffle plate means adjacent said second openings projecting in directions away from said photosensitive paper, said conductive back plate being positioned at a shorter distance from said electrodes than the distance between the latter and the photosensitive paper so as to cause an ion wind generated by an electric field within the device, upon a high voltage being supplied to said electrodes, to flow toward said back plate and through said second openings along said baffle plates, said baffle plates preventing return flow of said ion wind egressing from said second openings toward said first opening and said photosensitive paper.
Claim 3
Dependent Claim
58 words
A corona discharge device as claimed in claim 1, comprising hood means fastened to the divergent rearmost ends of said baffle plates so as to form an enclosed space therewith, said hood means having an outlet aperture; and suction fan means being positioned in said outlet aperture so as to aspirate said ion wind through said second openings.
References Cited (Backward Citations)
US2777957A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-12-03 | 1977-06-04 | 1977-12-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-03 | 1981-06-04 | 1981-12-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-03 | 1985-06-04 | 1985-12-04 | $7700.00 | Window Closed / Lapsed |