US3811048A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrophotographic charging apparatus
Assignee: Xerox Corp
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Filing: 1972-09-12
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Granted: 1974-05-14
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Expires: 1992-09-12
Abstract
Abstract A corona shield is positioned about a corona wire to shield against radiation from the wire in all but the desired direction (onto a xerographic surface). The shield members are movable in various directions relative to the corona wire so as to control intensity and direction of the corona discharge, thus to control the density of the electrostatic image on the xerographic surface.
Inventors
- 👤 S Matsumoto
- 👤 I Takahashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 17:09
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/02; G03G15/0291
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
98 words
A corona apparatus for use in charging a surface in an electrophotographic process, said coronA apparatus including a corona wire and a grounded, conductive concave shield member partially surrounding said corona wire, at least a part of said surface being exposed to positive corona discharge from said corona wire when a positive electrical potential is applied to said wire, adjustment means to control the intensity of the positive corona discharge from said corona wire relative to said surface, said adjustment means including means to move at least a part of said shield member relative to said corona wire.
Claim 2
Dependent Claim
98 words
A corona apparatus for use in charging a surface in an electrophotographic process, said coronA apparatus including a corona wire and a grounded, conductive concave shield member partially surrounding said corona wire, at least a part of said surface being exposed to positive corona discharge from said corona wire when a positive electrical potential is applied to said wire, adjustment means to control the intensity of the positive corona discharge from said corona wire relative to said surface, said adjustment means including means to move at least a part of said shield member relative to said corona wire.
Claim 3
Dependent Claim
46 words
A corona apparatus as defined in claim 1, wherein said means to move at least a part of said shield member relative to said corona wire comprises means to move at least part of said shield member in a direction toward and away from said surface.
Claim 4
Dependent Claim
46 words
A corona apparatus as defined in claim 1, wherein said means to move at least a part of said shield member relative to said corona wire comprises means to move at least a part of said shield member in a direction generally parallel to said surface.
Claim 5
Dependent Claim
43 words
A corona apparatus as defined in claim 1, wherein said means to move at least a part of said shield member relative to said corona wire comprises means to expand and contract the concavity of said shield member relative to said corona wire.
Claim 6
Dependent Claim
45 words
The corona apparatus of claim 1, wherein said means to move at least a part of said shield member relative to said corona wire comprises means to move at least a first part of said shield member independently of the remainder of said shield member.
Claim 7
Dependent Claim
22 words
The corona apparatus of claim 1, further including insulating means located between said corona wire and a portion of said shield member.
Claim 8
Dependent Claim
43 words
The corona apparatus of claim 1, wherein said means to move at least a part of said shield member relative to said corona wire includes a spring biased, pivoting support member and an adjusting screw for causing pivotal motion of said support member.
References Cited (Backward Citations)
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US3566110A
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US3603789A
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Cited
US3620617A
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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) | 1977-05-13 | 1977-11-12 | 1978-05-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-05-13 | 1981-11-12 | 1982-05-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-05-13 | 1985-11-12 | 1986-05-14 | $7700.00 | Window Closed / Lapsed |