US3673600A
Expired / Lapsed
US
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Electrographic recording method and apparatus
Assignee: Xerox Corp
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Filing: 1969-09-30
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Granted: 1972-06-27
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Expires: 1989-09-30
Abstract
Abstract Electrographic recording apparatus in which the latent electrostatic charge patterns recorded on a dielectric recording medium are rendered visible substantially coextensive with the deposition of the charge patterns on the recording medium. The recording medium is transported in a generally vertical direction at the charging zone. The array of charging electrodes are disposed from the record medium at the charging zone at a negative inclination relative to horizontal to form a ramp comprising a portion of the developer system. A second ramp is disposed from the recording medium at the charging zone at a positive inclination relative to horizontal, comprising another portion of the developer system. The positively inclined ramp is further situated in a manner such that developer material will be transported down the ramp in substantially uniform quantities to contact the recording medium. As the developer material contacts the recording medium, toner from the developer material will be attracted to the latent electrostatic charge patterns to render the charge patterns visible. Unused portions of the developer material after contacting the record medium are then transported down the ramp formed by the electrode array to a developer reservoir. By thus utilizing the electrode array as a portion of the overall developer path the development zone may be substantially coextensive with the charging zone thereby permitting rapid viewing of the recorded information.
Inventors
- 👤 David E Damouth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 08:23
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/22; G03G15/24; G03G15/34; G03G15/344; G03G15/348; G06; G06K; G06K15/00; G06K15/02; G06K15/14
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
182 words
Electrographic recording apparatus comprising; a casing, including a viewing area; a movable dielectric recording medium positioned in the casing, a portion of said movable dielectric recording medium being viewable through said viewing area; a first ramp means positioned in the casing for returning unused portions of developer material, said first ramp means including electrically conductive means for selectively depositing electrostatic charge in information configuration onto said recording medium; a second ramp means positioned in the casing for transporting and releasing developer material onto the recording medium at a point which is both immediately adjacent the point at which a portion of the dielectric recording medium is viewable through the viewing area and coextensive with the point at which the electrostatic charge is deposited on the recording medium; means for depositing developer material onto the second ramp means to generate flow along said second ramp meanS whereby developer is released from the second ramp means onto the recording medium and unused developer is deposited on the first ramp means, thereby rendering the recorded information visible and viewable substantially simultaneously with the recording thereof.
Claim 2
Dependent Claim
26 words
The recording apparatus as defined in claim 2 wherein the second ramp meanS includes a guide means to release the developer in a substantially uniform layer.
Claim 3
Dependent Claim
85 words
The recording apparatus as defined in claim 3 wherein the first ramp means comprises upper and lower layers of a dielectric material, the upper layer having a planar surface for returning the developer, said electrically conducting means comprising a plurality of individual electrically conducting elements embedded in the upper and lower layers of the dielectric material to insulate the elements, one end of said individual elements being exposed and in close proximity with said recording medium for depositing the electrostatic charge on said recording medium.
Claim 4
Dependent Claim
261 words
Electrographic recording apparatus comprising; a casing including a viewing area; a dielectric recording medium positioned in the casing; means for moving said dielectric recording medium said moving including a point where the recording medium is viewable in the viewing area; a ramp means within the casing positively inclined with respect to horizontal, the lower end of said ramp means positioned adjacent the dielectric recording medium at a point during the movement thereof immediately prior to the point at which said dielectric recording medium is visible in the viewing area to deposit developer on the recording medium; an array of charging electrodes means for depositing electrostatic charge in information configuration on said recording medium at a point on the moving recording medium immediately prior to the point at which developer is deposited thereon, said array including an insulated planar surface at a negative inclination with respect to the horizontal, the upper end of said insulated planar surface positioned adjacent to and spaced immediately below the lower end of the ramp means and defining a surface for returning developer; a developer reservoir positioned in said casing below the lower end of the insulated planar surface; and means for conveying developer from the reservoir to the upper portion of the ramp means whereby developer flows down said ramp means and contacts said recording medium to render charge patterns on said recording medium visible and the unused developer is deposited on the planar surface and transported to the developer reservoir, whereby the recorded information is rendered visible and viewable substantially simultaneously with the recording thereof.
Claim 5
Dependent Claim
69 words
The apparatus as defined in claim 5 wherein the recording medium is a continuous web of dielectrically coated paper and further comprising a roller means rotatably supported within the casing, said paper web passing over said roller means in a generally vertical direction, the ramp means and electrode array being positioned adjacent said paper web as the paper web passes over said roller means in the generally vertical direction.
Claim 6
Dependent Claim
24 words
The apparatus as defined in claim 6 wherein the ramp means includes a guide means for releasing the developer in a substantially uniform layer.
Claim 7
Independent Claim
108 words
A method of recording information on a dielectric recording medium comprising: passing a dielectric recording medium onto which information is to be recorded past a recording station; depositing electrostatic charge patterns in information configuration on said dielectric recording medium at said recording station; rendering charge patterns on said dielectric recording medium visible substantially coextensive with deposition of charge on the recording medium by contacting said recording medium with a developer material at said recording station; and subsequently passing the dielectric recording medium past an operator viewing station immediately adjacent said recording station, whereby said visible charge patterns are viewable by an operator substantially coextensive with the development thereof.
Claim 8
Dependent Claim
44 words
The method as defined in claim 8 wherein said charge patterns are rendered visible by passing from a developer storage zone a developer material comprised of toner and carrier over the dielectric recording medium substantially coextensive with deposition of charge on the recording medium.
Claim 9
Independent Claim
108 words
A method of recording information on a dielectric recording medium, comprising: depositing at a recording station by an electrographic recording means electrostatic charges, in information configuration, on a moving dielectric recording medium; rendering charge patterns on the dielectric recording medium visible substantially simultaneously with the formation thereof by passing from a developer storage zone a developer material over the dielectric recording medium in close proximity to the point at which the electrostatic pattern is placed on the dielectric recording medium; depositing unused portions of developer material onto the electrographic recording means; and returning unused portions of developer material on the electrographic recording means to the developer storage zone.
Claim 10
Dependent Claim
42 words
The method as defined in claim 10 and further comprising: subsequently passing the dielectric recording medium past an operator viewing station immediately adjacent said recording station, whereby said visible charge patterns are viewable by an operator substantially coextensive with the development thereof.
Claim 11
Dependent Claim
28 words
The method as defined in claim 10 wherein the developer material is passed from the developer storage zone over the dielectric recording medium in a thin uniform layer.
Claim 12
Dependent Claim
131 words
Electrographic recording apparatus, comprising: a dielectric recording medium; a recording station including means for depositing electrostatic charges in information configuration on said dielectric recording medium; means for advancing the dielectric recording medium, said means for advancing the dielectric recording medium moving the dielectric recording medium past the recording station; means positioned at the recording station for rendering the charge patterns on said dielectric recording medium visible substantially simultaneously with deposition of charge in information configuration on the dielectric recording medium; and an operator viewing station closely adjacent to said recording station, said means for advancing the dielectric recording medium moving the dielectric recording medium past the viewing station immediately after the charge patterns are rendered visible whereby said charge patterns are viewable by an operator substantially coextensive with the development thereof.
Claim 13
Dependent Claim
136 words
Electrographic recording apparatus, comprising: a dielectric recording medium; a recording station including recording means for depositing electrostatic charges in information configuration on said dielectric recording medium, said recording means defining a ramp adjacent the dielectric recording medium for transporting unused developer material away from said recording station; means for advancing the dielectric recording medium, said means for advancing the dielectric recording medium moving the dielectric recording medium past the recording station; and means positioned at the recording station for releasing developer material adjacent the dielectric recording medium at a point immediately adjacent the means for depositing electrostatic charges in information configuration to thereby render the charge patterns on said dielectric recording medium visible substantially simultaneously with deposition of charge in information configuration, the unused developer material being transported away from the recording station on said ramp.
Claim 14
Dependent Claim
60 words
The apparatus as defined in claim 14 and further comprising: an operator viewing station closely adjacent to said recording station, said means for advancing the dielectric recording medium moving the dielectric recording medium past the viewing station immediately after the charge patterns are rendered visible whereby said charge patterns are viewable by an perator substantially coextensive with the development thereof.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-06-27 | 1975-12-27 | 1976-06-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-27 | 1979-12-27 | 1980-06-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-27 | 1983-12-27 | 1984-06-27 | $7700.00 | Window Closed / Lapsed |