Patent CA727557A successfully refreshed from Google Patents.
US4454559A
Expired / Lapsed
US
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Control for a corona discharge device
Assignee: Xerox Corp
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Filing: 1982-08-30
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Granted: 1984-06-12
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Expires: 2002-08-30
Abstract
Abstract Control apparatus for a corona discharge device to be utilized in a xerographic reproduction machine. The control is characterized by utilizing the shield or coronode voltage to derive signals which can be used for maintaining the photoconductive surface of the machine at a predetermined voltage level. The voltage level on the shield or coronode is measured twice, once with the surface in its conducting state and with the surface in its non-conducting state. The difference between the two voltages is compared to a reference voltage to generate an output signal for controlling the voltage applied to either the shield or coronode depending upon which is being used.
Inventors
- 👤 Vittal U. Shenoy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 13:24
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/02; G03G15/0266; G03G15/0291
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
95 words
A corona device for depositing a uniform charge on a photoconductive surface comprising: a coronode member; a conductive shield member; means including a constant photoreceptor current power supply for supplying power to one of said members; means for intermittently illuminating said photoconductive surface; means for generating an electrical signal representing the difference in the voltage on said one of said members for an illuminated photoconductor condition and a non-illuminated condition; and means for comparing said difference to a reference voltage to derive an output for modify the voltage applied to said one of said members.
Claim 2
Dependent Claim
95 words
A corona device for depositing a uniform charge on a photoconductive surface comprising: a coronode member; a conductive shield member; means including a constant photoreceptor current power supply for supplying power to one of said members; means for intermittently illuminating said photoconductive surface; means for generating an electrical signal representing the difference in the voltage on said one of said members for an illuminated photoconductor condition and a non-illuminated condition; and means for comparing said difference to a reference voltage to derive an output for modify the voltage applied to said one of said members.
Claim 3
Dependent Claim
14 words
Apparatus according to claim 1 wherein said power is supplied to said coronode member.
Claim 4
Dependent Claim
15 words
Apparatus according to claim 1 wherein said power is supplied to said conductive shield member.
Claim 5
Independent Claim
120 words
The method of uniformly charging a photoconductive surface by means of a corona charging device including a coronode member and a conductive shield member, the method comprising the steps of: operatively coupling one of said members to a power source; measuring the voltage on one of said members with said surface in a non-conducting state; measuring the voltage on said one of said members with said photoconductive surface in a conducting state; comparing the difference between the two voltages to a reference voltage; generating a signal representative of the difference between said reference voltage and the voltage difference between said two voltages; and modifying the input of the power supply to said one said members in accordance with said signal.
Claim 6
Independent Claim
120 words
The method of uniformly charging a photoconductive surface by means of a corona charging device including a coronode member and a conductive shield member, the method comprising the steps of: operatively coupling one of said members to a power source; measuring the voltage on one of said members with said surface in a non-conducting state; measuring the voltage on said one of said members with said photoconductive surface in a conducting state; comparing the difference between the two voltages to a reference voltage; generating a signal representative of the difference between said reference voltage and the voltage difference between said two voltages; and modifying the input of the power supply to said one said members in accordance with said signal.
Claim 7
Dependent Claim
15 words
The method according to claim 4 wherein the voltage on said coronode member is measured.
Claim 8
Dependent Claim
16 words
The method according to claim 4 wherein the voltage on said conductive shield member is measured.
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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) | 1987-06-12 | 1987-12-12 | 1988-06-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-06-12 | 1991-12-12 | 1992-06-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-06-12 | 1995-12-12 | 1996-06-12 | $7700.00 | Window Closed / Lapsed |