Patent US4282303A successfully refreshed from Google Patents.
US4282303A
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US
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Development method and apparatus
Assignee: Xerox Corp
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Filing: 1980-05-05
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Granted: 1981-08-04
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Expires: 2000-05-05
Abstract
Abstract In the development of nonuniform latent images on an imaging member, wherein xerographic polar or polarizable toner particles are employed, it is desirable to utilize a development system that will bring the polar or polarizable toner into contact with the latent image without triboelectrically charging the particles and without requiring magnetic particles when the image is electrostatic and without demagnetizing the image when it is magnetic. To achieve this aim, a dielectric brush having convergent electrostatic fields is disclosed and claimed.
Inventors
- 👤 Richard F. Bergen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 18:11
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/06; G03G15/08; G03G15/0806; G03G15/0818
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
87 words
In an apparatus employing polar or polarizable toner particles for the development of a nonuniform electrostatic or magnetic latent image, a development means comprising a movable insulating member disposed in close proximity to said latent image, said member supporting an electrode means for establishing on the member convergent fields extending out from said member, said member being disposed to directly contact a source of said polar or polarizable toner particles in a first location and transport said particles to said nonuniform latent image in a second location.
Claim 2
Dependent Claim
87 words
In an apparatus employing polar or polarizable toner particles for the development of a nonuniform electrostatic or magnetic latent image, a development means comprising a movable insulating member disposed in close proximity to said latent image, said member supporting an electrode means for establishing on the member convergent fields extending out from said member, said member being disposed to directly contact a source of said polar or polarizable toner particles in a first location and transport said particles to said nonuniform latent image in a second location.
Claim 3
Dependent Claim
31 words
The apparatus of claim 1 wherein the movable member of said development means is a rotatable cylinder bearing closely spaced electrode means on the surface thereof for establishing said convergent fields.
Claim 4
Dependent Claim
41 words
The apparatus of claim 2 wherein the electrode means comprises a first electrically conductive member disposed in spaced relation to a second electrically conductive member, said first electrically conductive member being electrically biased with respect to said second electrically conductive member.
Claim 5
Dependent Claim
32 words
The apparatus of claim 3 wherein the electrode means for establishing convergent fields on the surface of said movable member comprises axially aligned, interdigitated electrodes, alternate members of which are connected together.
Claim 6
Dependent Claim
76 words
The apparatus of claim 2 wherein the electrode means for establishing convergent fields around the outer surface of the rotatable cylinder comprises first and second concentric cylindrical electrodes, said first electrode being disposed within said second electrode, said second electrode being a screen having an open area of at least about 50%, the distance between said first electrode and said second electrode being substantially equal to the distance between centers of adjacent conductors of said screen.
Claim 7
Dependent Claim
41 words
The apparatus of claim 2 wherein the electrode means for establishing convergent fields around the outer surface of the rotatable cylinder is a pair of conductors in the form of a helix, each conductor being connected to a separate voltage source.
Claim 8
Dependent Claim
14 words
The apparatus of claim 1 wherein the nonuniform latent image is an electrostatic image.
Claim 9
Dependent Claim
14 words
The apparatus of claim 1 wherein the nonuniform latent image is a magnetic image.
Claim 10
Dependent Claim
20 words
The apparatus of claim 4 wherein the distance between conductive members is from about 0.06 cm to about 0.6 cm.
Claim 11
Dependent Claim
29 words
The apparatus of claim 4 wherein the ratio of the width of the electrodes to the distance between electrodes of said array varies from about 30:70 to about 70:30.
Claim 12
Dependent Claim
28 words
The apparatus of claim 1 wherein the pile height of polarized toner on the movable member is controlled by a member disposed in spaced relation with said member.
Claim 13
Dependent Claim
18 words
The apparatus of claim 11 wherein the member for controlling the toner pile height is a doctor blade.
Claim 14
Dependent Claim
15 words
The apparatus of claim 1 wherein the electrode means is coated with an insulating coating.
Claim 15
Independent Claim
86 words
A method of developing a nonuniform electrostatic or magnetic latent image on an imaging member which comprises, establishing a multiplicity of convergent electrical fields on a movable insulating member bearing electrical conductors, directly contacting a source of polar or polarizable toner particles with the insulating member and moving the insulating member through a path that brings the toner particles attracted by the convergent electrical fields into close proximity with the nonuniform latent image, said toner particles exhibiting paramagnetic properties when said nonuniform latent image is magnetic.
Claim 16
Independent Claim
86 words
A method of developing a nonuniform electrostatic or magnetic latent image on an imaging member which comprises, establishing a multiplicity of convergent electrical fields on a movable insulating member bearing electrical conductors, directly contacting a source of polar or polarizable toner particles with the insulating member and moving the insulating member through a path that brings the toner particles attracted by the convergent electrical fields into close proximity with the nonuniform latent image, said toner particles exhibiting paramagnetic properties when said nonuniform latent image is magnetic.
Claim 17
Dependent Claim
25 words
The method of claim 14 wherein said multiplicity of convergent electrical fields are established by voltage differences applied between closely spaced adjacently positioned electrical conductors.
Claim 18
Dependent Claim
21 words
The method of developing a nonuniform latent image in accordance with claim 14 wherein the latent image is a magnetic image.
Claim 19
Dependent Claim
21 words
The method of developing a nonuniform latent image in accordance with claim 14 wherein the latent image is an electrostatic image.
Claim 20
Independent Claim
134 words
An apparatus for making a copy of an original document comprising a means for imparting to an imaging member a nonuniform electrostatic or magnetic latent image, a development means for rendering visible said latent image, said development means comprising a movable insulating member disposed in close proximity to said latent image, said member supporting an electrode means for establishing on the member convergent fields extending out from said member, said member being disposed to directly contact a source of said polar or polarizable toner particles in a first location and transport said particles to said nonuniform latent image in a second location, a transfer means to transfer the toner in image configuration to a support member, a means for fixing the toner to the support member, and a means for cleaning the imaging member.
Claim 21
Independent Claim
134 words
An apparatus for making a copy of an original document comprising a means for imparting to an imaging member a nonuniform electrostatic or magnetic latent image, a development means for rendering visible said latent image, said development means comprising a movable insulating member disposed in close proximity to said latent image, said member supporting an electrode means for establishing on the member convergent fields extending out from said member, said member being disposed to directly contact a source of said polar or polarizable toner particles in a first location and transport said particles to said nonuniform latent image in a second location, a transfer means to transfer the toner in image configuration to a support member, a means for fixing the toner to the support member, and a means for cleaning the imaging member.
Claim 22
Dependent Claim
15 words
The apparatus of claim 18 wherein the nonuniform latent image is an electrostatic latent image.
Claim 23
Dependent Claim
15 words
The apparatus of claim 18 wherein the nonuniform latent image is a magnetic latent image.
References Cited (Backward Citations)
US3519461A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-08-03 | 1985-02-02 | 1985-08-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-08-03 | 1989-02-02 | 1989-08-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-08-03 | 1993-02-02 | 1993-08-04 | $7700.00 | Window Closed / Lapsed |