US3851229A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Current measuring device
Assignee: Xerox Corp
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Filing: 1973-06-21
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Granted: 1974-11-26
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Expires: 1993-06-21
Abstract
Abstract A current measuring device in which the current flow produced by a corona generating device is detected. The device measures the spatial distribution of the current flow from the corona generating device.
Inventors
- 👤 T Hayne
- 👤 R Schroll
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 18:03
CPC Classifications
G; G01; G01R; G01R19/00; G01R19/08; G01R1/00; G01R1/20; G01R1/206; G01R19/0092; G03; G03G; G03G15/00; G03G15/02; G03G15/0291
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
91 words
A current measuring device, including: corona generating means arranged to form a spray of ions; means, closely spaced to said corona generating means, for accumulating the ions formed by said corona generating means to produce a current flow, said accumulating means comprising a plurality of substantially equally spaced electrically conductive portions insulated from one another; and means, in electrical communication with said accumulating means, for sensing the current flow on each portion of said accumulating means to detect the spatial distribution of the current flow produced by said corona generating means.
Claim 2
Dependent Claim
91 words
A current measuring device, including: corona generating means arranged to form a spray of ions; means, closely spaced to said corona generating means, for accumulating the ions formed by said corona generating means to produce a current flow, said accumulating means comprising a plurality of substantially equally spaced electrically conductive portions insulated from one another; and means, in electrical communication with said accumulating means, for sensing the current flow on each portion of said accumulating means to detect the spatial distribution of the current flow produced by said corona generating means.
Claim 3
Dependent Claim
58 words
A device as recited in claim 1, wherein said current sensing means includes: switch means in electrical communication with said accumulating means; and current measuring means in electrical communication with said switch means, said switch means being adapted to electrically connect each portion of said accumulating means to said current measuring means to detect the current flow thereon.
Claim 4
Dependent Claim
63 words
A device as recited in claim 2, further including a pair of resistance elements, one of said resistance elements being electrically connected in series between said current measuring means and the portion of said accumulating means in electrical communication therewith, the other of said resistance elements being electrically connected in series between the other portions of said accumulating means and an electrical ground.
Claim 5
Dependent Claim
35 words
A device as recited in claim 2, wherein said corona generating means includes: an elongated shield defining an open ended chamber; and a corona discharge electrode disposed in the open ended chamber of said shield.
Claim 6
Dependent Claim
40 words
A device as recited in claim 4, wherein said discharge electrode includes at least a pair of spaced substantially parallel conductive coronode wires, said pair of coronode wires extending substantially in a longitudinal direction along the length of said shield.
Claim 7
Dependent Claim
78 words
A device as recited in claim 5, further including grid means comprising a plurality of spaced substantially parallel grid wires mounted in said shield and extending substantially in a longitudinal direction along the length thereof, said plurality of grid wires partially enclosing the open end of said shield with one of the coronode wires being disposed in the chamber therebeneath, the other of said coronode wires being disposed in the unenclosed portion of the chamber of said shield.
Claim 8
Dependent Claim
96 words
A device as recited in claim 6, wherein said accumulating means includes an elongated surface having the electrically conductive portions thereof arranged along discrete regions of the longitudinal axis thereof, said elongated surface being closely spaced to said pair of coronode wires with the longitudinal axis of said elongated surface being closely spaced from and substantially parallel to the longitudinal axes of said paiR of coronode wires, said elongated surface being arranged such that each electrically conductive portion detects the current flow from the discrete region opposed therefrom along the longitudinal axes of said coronode wires.
Claim 9
Dependent Claim
80 words
A device as recited in claim 7, wherein said accumulating means includes: a conductive arcuate member; and an insulating sheet mounted on the exterior peripheral surface of said arcuate member, said elongated surface being mounted on said insulating sheet such that each electrically conductive portion extends from one marginal region of said arcuate member to the other marginal region thereof with each electrically conductive portion being located on a discrete region of said arcuate member in the longitudinal direction thereof.
Claim 10
Dependent Claim
16 words
A device as recited in claim 8, wherein said elongated surface includes a printed circuit board.
Claim 11
Independent Claim
111 words
A device simulating a photoconductive surface for sensing the current distribution thereon in an electrophotographic printing machine of the type having corona generating means spraying ions to create a charge on the photoconductive surface, including: means, closely spaced to the corona generating means, for accumulating the ions formed by the corona generating means to produce a current flow, said accumulating means comprising a plurality of substantially equally spaced electrically conductive portions insulated from one another; and means, in electrical communication with said accumulating means, for sensing the current flow on each portion of said accumulating means to detect the spatial distribution of the current flow produced by the corona generating means.
Claim 12
Independent Claim
111 words
A device simulating a photoconductive surface for sensing the current distribution thereon in an electrophotographic printing machine of the type having corona generating means spraying ions to create a charge on the photoconductive surface, including: means, closely spaced to the corona generating means, for accumulating the ions formed by the corona generating means to produce a current flow, said accumulating means comprising a plurality of substantially equally spaced electrically conductive portions insulated from one another; and means, in electrical communication with said accumulating means, for sensing the current flow on each portion of said accumulating means to detect the spatial distribution of the current flow produced by the corona generating means.
Claim 13
Dependent Claim
58 words
A device as recited in claim 9, wherein said current sensing means includes: switch means in electrical communication with said accumulating means; and current measuring means in electrical communication with said switch means, said switch means being adapted to electrically connect each portion of said accumulating means to said current measuring means to detect the current flow thereon.
Claim 14
Dependent Claim
63 words
A device as recited in claim 11, further including a pair of resistance elements, one of said resistance elements being electrically connected in series between said current measuring means and the portion of said accumulating means in electrical communication therewith, the other of said resistance elements being electrically connected in series between the other portions of said accumulating means and an electrical ground.
Claim 15
Dependent Claim
40 words
A device as recited in claim 11, wherein the corona generating means of the electrophotographic printing machine includes: an elongated shield defining an open ended chamber; and a corona discharge electrode disposed in the open ended chamber of said shield.
Claim 16
Dependent Claim
40 words
A device as recited in claim 13, wherein said discharge electrode includes at least a pair of spaced substantially parallel conductive coronode wires, said pair of coronode wires extending substantially in a longitudinal direction along the length of said shield.
Claim 17
Dependent Claim
78 words
A device as recited in claim 14, further including grid means comprising a plurality of spaced substantially parallel grid wires mounted in said shield and extending substantially in a longitudinal direction along the length thereof, said plurality of grid wires partially enclosing the open end of said shield with one of the coronode wires being disposed in the chamber therebeneath, the other of said coronode wires being disposed in the unenclosed portion of the chamber of said shield.
Claim 18
Dependent Claim
95 words
A device as recited in claim 15, wherein said accumulating means includes an elongated surface having the electrically conductive portions thereof arranged along discrete regions of the longitudinal axis thereof, said elongated surface being closely spaced to said pair of coronode wires with the longitudinal axis of said elongated surface closely spaced from and substantially parallel to the longitudinal axes of said pair of coronode wires, said elongated surface being arrangEd such that each electrically conductive portion detects the current flow from the discrete region opposed therefrom along the longitudinal axes of said coronode wires.
Claim 19
Dependent Claim
80 words
A device as recited in claim 16, wherein said accumulating means includes: a conductive arcuate member; and an insulating sheet mounted on the exterior peripheral surface of said arcuate member, said elongated surface being mounted on said insulating sheet such that each electrically conductive portion extends from one marginal region of said arcuate member to the other marginal region thereof with each electrically conductive portion being located on a discrete region of said arcuate member in the longitudinal direction thereof.
Claim 20
Dependent Claim
16 words
A device as recited in claim 16, wherein said elongated surface includes a printed circuit board.
References Cited (Backward Citations)
US3358378A
Cited
US3739246A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-11-25 | 1978-05-27 | 1978-11-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-11-25 | 1982-05-27 | 1982-11-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-11-25 | 1986-05-27 | 1986-11-26 | $7700.00 | Window Closed / Lapsed |