Patent US3591846A successfully refreshed from Google Patents.
US3591846A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Corona voltage supply for use in electrostatic copier
Assignee: Singer Co
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Filing: 1968-10-17
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Granted: 1971-07-06
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Expires: 1988-10-17
Abstract
Abstract A power supply is disclosed which provides a plurality of highvoltage DC outputs suitable for driving the corona voltage units located at the charging, developing, and transferring stations of an electrophotographic copying apparatus. Each of the outputs is electrically isolated from the others by means of individual rectifying and isolating diodes to prevent voltage fluctuations appearing at any one of the outputs from being communicated to and adversely affecting the voltage at any of the other outputs.
Inventors
- 👤 Detlef Schaffer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 22:23
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/80; G03G15/02; G03G15/0283; G03G15/0291
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
174 words
For use in an electrostatic copier having a corona charging unit, a corona developer unit, and a corona transfer unit, a power supply for supplying an isolated potential to each one of said corona units, said power supply comprising a transformer having a primary circuit and a secondary circuit, said secondary circuit having one side connected to a reference potential, and means for electrically isolating each one of said corona units from remaining ones of said corona units to prevent voltage fluctuations appearing at any one of said corona units from being communicated to any of the other said corona units through said power supply, said isolating means including a plurality of unidirectional conducting devices, each having an input terminal and an output terminal, the input terminal of each of said plurality of unidirectional conducting devices being directly connected to the other side of said secondary circuit at a common junction, the output terminals of each of said plurality of unidirectional conducting devices being directly connected to a separate one of said corona units.
Claim 2
Dependent Claim
174 words
For use in an electrostatic copier having a corona charging unit, a corona developer unit, and a corona transfer unit, a power supply for supplying an isolated potential to each one of said corona units, said power supply comprising a transformer having a primary circuit and a secondary circuit, said secondary circuit having one side connected to a reference potential, and means for electrically isolating each one of said corona units from remaining ones of said corona units to prevent voltage fluctuations appearing at any one of said corona units from being communicated to any of the other said corona units through said power supply, said isolating means including a plurality of unidirectional conducting devices, each having an input terminal and an output terminal, the input terminal of each of said plurality of unidirectional conducting devices being directly connected to the other side of said secondary circuit at a common junction, the output terminals of each of said plurality of unidirectional conducting devices being directly connected to a separate one of said corona units.
Claim 3
Dependent Claim
30 words
The apparatus of claim 1 wherein at least one of said unidirectional conducting devices is poled in a direction opposite that of the remaining ones of said unidirectional conducting devices.
Claim 4
Dependent Claim
21 words
The device of claim 1 wherein each of said unidirectional conducting devices comprises a diode having an anode and a cathode.
Claim 5
Dependent Claim
36 words
The apparatus of claim 3 wherein said diodes are poled to provide a high negative potential to said corona charging unit and said corona transfer unit, and a high positive potential to said corona developer unit.
Claim 6
Dependent Claim
49 words
The apparatus of claim 4 wherein said cathode of each of said diodes poled to provide a high negative potential is directly connected to said common junction and said anode of each of said diodes poled to provide a high positive potential is directly connected to said common junction.
Claim 7
Dependent Claim
29 words
The apparatus of claim 1 further including a capacitor coupled between said output terminal of at least one of said plurality of unidirectional conducting devices and said reference potential.
Claim 8
Dependent Claim
39 words
The apparatus of claim 1 further including a plurality of capacitors coupled between said reference potential and said plurality of output terminals, each one of said plurality of capacitors being connected to a different one of said output terminals.
Claim 9
Dependent Claim
185 words
A power supply for providing isolated high potential to a corona charging unit, a corona developer unit, and a corona transfer unit in an electrostatic copier, said power supply comprising a transformer having a primary circuit and a secondary circuit, a plurality of output terminals, each of said plurality of output terminals adapted to be connected to a different one of said corona units and means for electrically isolating each of said output terminals from remaining ones of said output terminals, said last-named means including a plurality of unidirectional conducting devices each having an input terminal and an output terminal, said input terminal of each of said unidirectional conducting devices being directly connected to a first side of said secondary circuit at a common junction, said output terminal of each of said unidirectional conducting devices being directly connected to a different one of said power supply output terminals, at least one of said unidirectional conducting devices being poled in a direction opposite that of the remaining ones of said unidirectional conducting devices, the other side of said secondary circuit being connected to a reference potential.
Claim 10
Dependent Claim
185 words
A power supply for providing isolated high potential to a corona charging unit, a corona developer unit, and a corona transfer unit in an electrostatic copier, said power supply comprising a transformer having a primary circuit and a secondary circuit, a plurality of output terminals, each of said plurality of output terminals adapted to be connected to a different one of said corona units and means for electrically isolating each of said output terminals from remaining ones of said output terminals, said last-named means including a plurality of unidirectional conducting devices each having an input terminal and an output terminal, said input terminal of each of said unidirectional conducting devices being directly connected to a first side of said secondary circuit at a common junction, said output terminal of each of said unidirectional conducting devices being directly connected to a different one of said power supply output terminals, at least one of said unidirectional conducting devices being poled in a direction opposite that of the remaining ones of said unidirectional conducting devices, the other side of said secondary circuit being connected to a reference potential.
Claim 11
Dependent Claim
42 words
The apparatus of claim 8 further including a plurality of capacitors coupled between said output terminal of said unidirectional conducting devices and said reference potential, each one of said plurality of capacitors being coupled to a different one of said output terminals.
Claim 12
Dependent Claim
22 words
The apparatus of claim 8 wherein each one of said unidirectional conducting devices comprises a diode having an anode and a cathode.
References Cited (Backward Citations)
US3308344A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-07-05 | 1975-01-04 | 1975-07-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-07-05 | 1979-01-04 | 1979-07-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-07-05 | 1983-01-04 | 1983-07-06 | $7700.00 | Window Closed / Lapsed |