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US3650622A
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US
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Apparatus for control of bias potential in an electrophotographic copier
Assignee: Eastman Kodak Co
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Filing: 1970-03-09
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Granted: 1972-03-21
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Expires: 1990-03-09
Abstract
Abstract An apparatus and method are disclosed for adjusting the potential difference between the conducting layer and ground at any preselected position on a photoconductive element that is continuous from exposure through development stations.
Inventors
- 👤 Theodore H Morse
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 13:48
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/02; G03G15/0291
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
129 words
In an electrophotographic copier including means for advancing along a predetermined path an electrophotographic recording element having a layer of photoconductive material and an electrically conductive backing which is electrically isolated from ground, a first corona discharge source positioned adjacent such path for impinging ions of a first potential upon the photoconductive layer to uniformly charge such layer, means for selectively dissipation the uniform charge on the photoconductive layer to form a developable charge pattern thereon, and developing means positioned adjacent such path for applying electroscopic pattern visible, the improvement comprising: means positioned adjacent said path downstream from the developing means for applying an electrical potential to the conductive backing of the recording element to establish an optimum potential in the backing at any preselected position along said path.
Claim 2
Dependent Claim
129 words
In an electrophotographic copier including means for advancing along a predetermined path an electrophotographic recording element having a layer of photoconductive material and an electrically conductive backing which is electrically isolated from ground, a first corona discharge source positioned adjacent such path for impinging ions of a first potential upon the photoconductive layer to uniformly charge such layer, means for selectively dissipation the uniform charge on the photoconductive layer to form a developable charge pattern thereon, and developing means positioned adjacent such path for applying electroscopic pattern visible, the improvement comprising: means positioned adjacent said path downstream from the developing means for applying an electrical potential to the conductive backing of the recording element to establish an optimum potential in the backing at any preselected position along said path.
Claim 3
Dependent Claim
43 words
The invention according to claim 1 wherein said applying means comprises a second corona discharge source for directing ions of a polarity opposite said first potential at the recording element, and means for varying the discharge intensity of said second corona discharge source.
References Cited (Backward Citations)
US3368894A
Cited
US3456109A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-03-21 | 1975-09-20 | 1976-03-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-03-21 | 1979-09-20 | 1980-03-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-03-21 | 1983-09-20 | 1984-03-21 | $7700.00 | Window Closed / Lapsed |