US3760229A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ac corotron
Assignee: Xerox Corp
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Filing: 1971-12-30
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Granted: 1973-09-18
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Expires: 1991-12-30
Abstract
Abstract An improved a.c. corotron for neutralizing the charge on a charge receiving surface is provided according to the teachings of the present invention. The a.c. corotron, which includes an electrode and a shield partially surrounding the electrode is adapted to be driven by an a.c. source connectable between the electrode and the shield. According to one embodiment of the invention an impedance is connected intermediate the electrode and the a.c. source to tend to equalize the magnitude of the a.c. potential applied to the electrode during the intervals in the operation of the a.c. corotron in which positive and negative ion current flows. This reduces the magnitude of any offset voltage which may ultimately remain on the charge receiving surface.
Inventors
- 👤 M Silverberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 17:25
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/02; G03G15/0291
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
102 words
Corotron apparatus for nuetralizing a charge receiving surface comprising in combination; an elongated electrode; a shield partially surrounding said electrode, said shield being maintained at a reference potential; impedance means coupled to said electrode for equalizing the relative magnitudes of positive and negative voltage applied to the coronode when ion current flows from the electrode; and means for supplying an a.c. voltage to said electrode to effect a corona discharge thereat, said last named means being connected intermediate said impedance means and a reference potential and said charge receiving surface being maintained in a fixed relationship with respect to said reference potential.
Claim 2
Dependent Claim
102 words
Corotron apparatus for nuetralizing a charge receiving surface comprising in combination; an elongated electrode; a shield partially surrounding said electrode, said shield being maintained at a reference potential; impedance means coupled to said electrode for equalizing the relative magnitudes of positive and negative voltage applied to the coronode when ion current flows from the electrode; and means for supplying an a.c. voltage to said electrode to effect a corona discharge thereat, said last named means being connected intermediate said impedance means and a reference potential and said charge receiving surface being maintained in a fixed relationship with respect to said reference potential.
Claim 3
Dependent Claim
16 words
Corotron apparatus as defined in claim 1 wherein said reference potential is maintained at ground potential.
Claim 4
Dependent Claim
14 words
Corotron apparatus as defined in claim 1 wherein said impedance means is a resistor.
Claim 5
Dependent Claim
129 words
Corotron apparatus for charging a charge receiving surface comprising in combination; an elongated electrode; a shield partially surrounding said electrode; impedance means coupled to said electrode for equalizing the relative magnitudes of positive and negative voltage applied to the electrode when ion current flows therefrom; first means for supplying an a.c. voltage to said electrode to effect corona discharge thereat, said first means being connected intermediate said impedance means and a reference potential; and second means for supplying a d.c. potential to said shield, said second means being connected intermediate said shield and said reference potential for charging said charge receiving surface to a potential of the same polarity as said d.c. potential, said charge receiving surface being maintained in a fixed relationship with respect to said reference potential.
Claim 6
Dependent Claim
129 words
Corotron apparatus for charging a charge receiving surface comprising in combination; an elongated electrode; a shield partially surrounding said electrode; impedance means coupled to said electrode for equalizing the relative magnitudes of positive and negative voltage applied to the electrode when ion current flows therefrom; first means for supplying an a.c. voltage to said electrode to effect corona discharge thereat, said first means being connected intermediate said impedance means and a reference potential; and second means for supplying a d.c. potential to said shield, said second means being connected intermediate said shield and said reference potential for charging said charge receiving surface to a potential of the same polarity as said d.c. potential, said charge receiving surface being maintained in a fixed relationship with respect to said reference potential.
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) | 1976-09-17 | 1977-03-19 | 1977-09-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-17 | 1981-03-19 | 1981-09-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-17 | 1985-03-19 | 1985-09-18 | $7700.00 | Window Closed / Lapsed |