EP0055984A2
Expired / Lapsed
EP
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Method and apparatus of producing a relatively high charge on charge-retaining materials
Assignee: Polaroid Corp
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Filing: 1982-01-04
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Granted: —
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Expires: 2002-01-04
Abstract
Abstract The maximum subcorona potential level to which a particular conductive bristle brush is able to regulate an electrostatic charge on charge-retaining material is substantially increased by limiting the electrical current available to said particular conductive bristle brush from a potential source coupled to said brush to a level that is less than a magnitude necessary for corona generation.
Inventors
- 👤 Semyon Kisler
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-31 12:56
CPC Classifications
H; H05; H05F; H05F3/00; H05F3/04
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
196 words
Improved apparatus for regulating charges on charge-retaining materials, comprising: a common electrical conductor; means for establishing an electrically conductive reference member; a predetermined number of electrically conductive bristles supported over said reference member with one end of each of said bristles being in an electrically coupled relation to said common conductor, said bristles extending from their said one end toward said reference surface with the free ends of said bristles being adjacent said reference member; means for limiting the electrical current available to said bristles from said power supply to less than a magnitude necessary to establish a corona field between any of said predetermined number of electrically conductive bristles and said reference member; and a DC power source connected between said common electrical conductor and said reference member, the potential of said power source having a predetermined magnitude and polarity for establishing an electric field that will adjust the electrostatic charge to the desired charge level on charge-retaining material passed between said free bristle ends and said reference member, a magnitude that would otherwise produce said corona field between a ' conductive bristle and said reference member in the absence of said current limiting means.
Claim 2
Dependent Claim
196 words
Improved apparatus for regulating charges on charge-retaining materials, comprising: a common electrical conductor; means for establishing an electrically conductive reference member; a predetermined number of electrically conductive bristles supported over said reference member with one end of each of said bristles being in an electrically coupled relation to said common conductor, said bristles extending from their said one end toward said reference surface with the free ends of said bristles being adjacent said reference member; means for limiting the electrical current available to said bristles from said power supply to less than a magnitude necessary to establish a corona field between any of said predetermined number of electrically conductive bristles and said reference member; and a DC power source connected between said common electrical conductor and said reference member, the potential of said power source having a predetermined magnitude and polarity for establishing an electric field that will adjust the electrostatic charge to the desired charge level on charge-retaining material passed between said free bristle ends and said reference member, a magnitude that would otherwise produce said corona field between a ' conductive bristle and said reference member in the absence of said current limiting means.
Claim 3
Dependent Claim
49 words
The apparatus of claim 1 wherein said corona current limiting means is additional conductive bristles supported in the same generally orientation as said predetermined number of electrically conductive bristles with an end of each of said additional bristles being in an electrically coupled relation to said common electrical conductor.
Claim 4
Dependent Claim
39 words
The apparatus of claim 1 wherein said corona current limiting means is an electrical resistor of a predetermined ohmic value and said resistor is connected in series between said power source and said predetermined number of electrically conductive bristles.
Claim 5
Dependent Claim
22 words
The apparatus of claim 1 wherein the diameter of each of said conductive bristles is equal to or less than 50 microns.
Claim 6
Dependent Claim
14 words
The apparatus of claim 1 wherein said conductive bristles are formed of conductive nylon.
Claim 7
Dependent Claim
14 words
The apparatus of claim 1 wherein said conductive bristles are formed of stainless steel.
Claim 8
Dependent Claim
185 words
Apparatus for producing a charge of given magnitude on charge-retaining materials, said apparatus comprising: an electrically conductive reference member; a conductive brush arrangement having, a common conductive member with a plurality of conductive bristles having one end thereof electrically coupled to said common member and extended in generally parallel relation therefrom; means for mounting said brush arrangement over said reference member with the free ends of said bristles extending toward said member for charging charge-retaining material as it is advanced between said reference member and said bristles; means for coupling a DC source of power to said reference member and said brush arrangement to produce an electrical field therebetween, the power supply being capable of voltages in excess of the minimum voltage necessary to produce corona between said brush arrangement and said reference-member; and means for limiting the current flowing between said brush arrangement and said reference surface to a value less than that occurring with corona at said minimum voltage level whereby said material may be charged to comparatively high levels by electrical fields in excess of said minimum corona voltage without producing corona.
Claim 9
Dependent Claim
185 words
Apparatus for producing a charge of given magnitude on charge-retaining materials, said apparatus comprising: an electrically conductive reference member; a conductive brush arrangement having, a common conductive member with a plurality of conductive bristles having one end thereof electrically coupled to said common member and extended in generally parallel relation therefrom; means for mounting said brush arrangement over said reference member with the free ends of said bristles extending toward said member for charging charge-retaining material as it is advanced between said reference member and said bristles; means for coupling a DC source of power to said reference member and said brush arrangement to produce an electrical field therebetween, the power supply being capable of voltages in excess of the minimum voltage necessary to produce corona between said brush arrangement and said reference-member; and means for limiting the current flowing between said brush arrangement and said reference surface to a value less than that occurring with corona at said minimum voltage level whereby said material may be charged to comparatively high levels by electrical fields in excess of said minimum corona voltage without producing corona.
Claim 10
Independent Claim
147 words
A method of producing a relatively high charge on charge-retaining materials, comprising the steps of: advancing said charge-retaining material across an electrically conductive reference member; mounting a conductive brush arrangement having a plurality of conductive bristles over said reference member with the free ends of said bristles extending toward said member for charging said charge-retaining material as it is advanced between said reference member and said bristles; applying across said reference member and said brush arrangement a potential in excess of the minimum voltage necessary to produce corona between said brush arrangement and said reference member; and limiting the current flow between said brush arrangement and said reference surface to a value less than that occurring with said corona at said minimum voltage level whereby said material may be charged to comparatively high levels by electrical fields in excess of said minimum corona voltage without producing corona.
Claim 11
Independent Claim
147 words
A method of producing a relatively high charge on charge-retaining materials, comprising the steps of: advancing said charge-retaining material across an electrically conductive reference member; mounting a conductive brush arrangement having a plurality of conductive bristles over said reference member with the free ends of said bristles extending toward said member for charging said charge-retaining material as it is advanced between said reference member and said bristles; applying across said reference member and said brush arrangement a potential in excess of the minimum voltage necessary to produce corona between said brush arrangement and said reference member; and limiting the current flow between said brush arrangement and said reference surface to a value less than that occurring with said corona at said minimum voltage level whereby said material may be charged to comparatively high levels by electrical fields in excess of said minimum corona voltage without producing corona.
References Cited (Backward Citations)
No citation records indexed.
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