US3586908A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatic potential control system for electrophotography apparatus
Assignee: Individual
•
Filing: 1969-02-28
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Granted: 1971-06-22
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Expires: 1989-02-28
Abstract
Abstract An automatic potential control system for use with electrophotography apparatus having a corona generator to maintain a surface at a preset fixed potential value. A detector is electrostatically coupled to the surface and produces a control signal indicative of the magnitude and polarity of the potential difference of the surface relative to the preset fixed potential. Integrator means are connected to the output of the detector and control a high voltage supply to supply a corresponding input voltage to the corona generator to cause the latter to charge the surface to the preset fixed potential value.
Inventors
- 👤 Robert E Vosteen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 20:44
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/02; G03G15/0266
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
104 words
An automatic potential control system for use with electrophotography apparatus having a corona generator to maintain a surface at a preset fixed potential comprising: a detector electrostatically coupled to the surface to produce a control signal indicative of the magnitude and polarity of the potential difference of the surface relative to the preset fixed potential; integrator means connected to the output of the detector, and a high voltage supply connected to the output of the integrator means and controlled by the latter to supply a corresponding voltage to the corona generator to cause the latter to maintain the surface at the preset fixed potential.
Claim 2
Dependent Claim
104 words
An automatic potential control system for use with electrophotography apparatus having a corona generator to maintain a surface at a preset fixed potential comprising: a detector electrostatically coupled to the surface to produce a control signal indicative of the magnitude and polarity of the potential difference of the surface relative to the preset fixed potential; integrator means connected to the output of the detector, and a high voltage supply connected to the output of the integrator means and controlled by the latter to supply a corresponding voltage to the corona generator to cause the latter to maintain the surface at the preset fixed potential.
Claim 3
Dependent Claim
34 words
An automatic potential control system as recited in claim 1 further comprising: an integrator controlled high voltage source interposed between the output of the integrator means and a series connected fixed high voltage supply.
Claim 4
Dependent Claim
51 words
An automatic potential control system as recited in claim 1 further comprising: switch means connected between the output of the detector and the input of the integrating means to cause the input of the latter to be restricted to those times when a valid sample is being measured by the detector.
Claim 5
Dependent Claim
18 words
An automatic potential control system as recited in claim 1 wherein the integrating means comprises first capacitance means.
Claim 6
Dependent Claim
62 words
An automatic potential control system as recited in claim 4 further comprising: second capacitance means connected between the input of the integrating means and the output of the high voltage supply, the relative capacitance values of the first and second capacitance means being selected such that the system can correct relatively fast variations between the actual and preset fixed surface potential values.
Claim 7
Dependent Claim
34 words
An automatic potential control system as recited in claim 5 further comprising: an integrator controlled high voltage source interposed between the output of the integrator means and a series connected fixed high voltage supply.
Claim 8
Dependent Claim
51 words
An automatic potential control system as recited in claim 6 further comprising: switch means connected between the output of the detector and the input of the integrating means to cause the input of the latter to be restricted to those times when a valid sample is being measured by the detector.
Claim 9
Dependent Claim
37 words
An automatic potential control system as recited in claim 1 wherein the integrating network comprises an amplifier connected as an operational amplifier having associated feedback capacitance means connected between its output and input, and input resistance means.
Claim 10
Dependent Claim
61 words
An automatic potential control system as recited in claim 8 further comprising: additional capacitance means connected between the input of the amplifier and the output of the high voltage supply, the relative capacitance values of the feedback and additional capacitance means being selected such that the system can correct relatively fast variations between the actual and preset fixed surface potential values.
Claim 11
Dependent Claim
50 words
An automatic potential control system as recited in claim 9 further comprising: switch means connected between the output of the detector and the input resistance means to cause the input of the integrating means to be restricted to those times when a valid sample is being measured by the detector.
Claim 12
Dependent Claim
72 words
An automatic potential control system as recited in claim 1 wherein the surface being measured is in the form of a rotating drum, the detector being positioned in forward direction relative to the corona generator, with respect to the direction of rotation of the drum, by a predetermined angular distance which is sufficient to prevent the existence of any significant airborne corona charge between the detector and the surface of the drum.
Claim 13
Dependent Claim
35 words
An automatic potential control system as recited in claim 11 further comprising: an integrator controlled high voltage source interposed between the output of the in generator means and a series connected fixed high voltage supply.
Claim 14
Dependent Claim
51 words
An automatic potential control system as recited in claim 11 further comprising: switch means connected between the output of the detector and the input of the integrating means to cause the input of the latter to be restricted to those times when a valid sample is being measured by the detector.
Claim 15
Dependent Claim
18 words
An automatic potential control system as recited in claim 11 wherein the integrating means comprises first capacitance means.
Claim 16
Dependent Claim
62 words
An automatic potential control system as recited in claim 14 further comprising: second capacitance means connected between the input of the integrating means and the output of the high voltage supply, the relative capacitance values of the first and second capacitance means being selected such that the system can correct relatively fast variations between the actual and preset fixed drum potential values.
Claim 17
Dependent Claim
34 words
An automatic potential control system as recited in claim 15 further comprising: an integrator controlled high voltage source interposed between the output of the integrator means and a series connected fixed high voltage supply.
Claim 18
Dependent Claim
51 words
An automatic potential control system as recited in claim 16 further comprising: switch means connected between the output of the detector and the input of the integrating means to cause the input of the latter to be restricted to those times when a valid sample is being measured by the detector.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-06-21 | 1974-12-21 | 1975-06-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-21 | 1978-12-21 | 1979-06-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-21 | 1982-12-21 | 1983-06-22 | $7700.00 | Window Closed / Lapsed |