US4476473A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrostatic record image forming method
Assignee: Fujifilm Business Innovation Corp
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Filing: 1982-01-25
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Granted: 1984-10-09
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Expires: 2002-01-25
Abstract
Abstract The auxiliary electrodes in a multi-stylus electrode assembly are coated with an insulating paint to permit precharging of the recording medium.
Inventors
- 👤 Shoji Wako
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 23:55
CPC Classifications
G; G06; G06K; G06K15/00; G06K15/02; G06K15/14; H; H04; H04N; H04N1/00; H04N1/23; H04N1/29
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
81 words
A multi-stylus electrode assembly for use in electrostatic recording, said assembly including a body having a face to be directed toward a recording paper, a plurality of charging electrodes arranged in a line along said face and a plurality of auxiliary electrodes disposed on either side of said charging electrodes, the improvement comprising an insulating material covering said auxiliary electrodes which provides a gap holding and insulating function wherein said insulating material maintains said charging electrodes apart from said recording paper.
Claim 2
Dependent Claim
81 words
A multi-stylus electrode assembly for use in electrostatic recording, said assembly including a body having a face to be directed toward a recording paper, a plurality of charging electrodes arranged in a line along said face and a plurality of auxiliary electrodes disposed on either side of said charging electrodes, the improvement comprising an insulating material covering said auxiliary electrodes which provides a gap holding and insulating function wherein said insulating material maintains said charging electrodes apart from said recording paper.
Claim 3
Dependent Claim
23 words
An electrode assembly as claimed in claim 1, wherein said insulating material has a volumetric resistivity of at least approximately 10 10 Ωcm.
Claim 4
Dependent Claim
22 words
An electrode assembly as claimed in claim 1, wherein said insulating material is between approximately 2 μm and 20 μm in thickness.
Claim 5
Dependent Claim
16 words
An electrode assembly as claimed in claim 1, wherein said insulating material is an insulating paint.
Claim 6
Dependent Claim
16 words
An electrode assembly as claimed in claim 1, wherein said insulating material is a polyfluorethylene paint.
Claim 7
Independent Claim
126 words
A method of electrostatic record image forming of the type including steps of passing a multi-stylus electrode assembly having charging electrodes and auxiliary electrodes over a surface of an electrostatic recording medium during relative movement of one of said assembly and medium, and generating a potential difference between selected charging electrodes and corresponding auxiliary electrodes to record an electrostatic latent image on said recording medium, the improvement characterized in that said passing step comprises passing a multi-stylus electrode assembly having its auxiliary electrodes covered with an insulating material over said surface of said recording medium such that said insulating material contacts said surface, said insulating material providing a gap holding and insulating function wherein said insulating material maintains said charging electrodes apart from said recording medium.
Claim 8
Independent Claim
126 words
A method of electrostatic record image forming of the type including steps of passing a multi-stylus electrode assembly having charging electrodes and auxiliary electrodes over a surface of an electrostatic recording medium during relative movement of one of said assembly and medium, and generating a potential difference between selected charging electrodes and corresponding auxiliary electrodes to record an electrostatic latent image on said recording medium, the improvement characterized in that said passing step comprises passing a multi-stylus electrode assembly having its auxiliary electrodes covered with an insulating material over said surface of said recording medium such that said insulating material contacts said surface, said insulating material providing a gap holding and insulating function wherein said insulating material maintains said charging electrodes apart from said recording medium.
Claim 9
Dependent Claim
22 words
The method as claimed in claim 6, wherein said insulating material has a volumetric resistivity of at least approximately 10 10 Ωcm.
Claim 10
Dependent Claim
22 words
The method as claimed in claim 6, wherein the thickness of said insulating material is between approximately 2 μm and 20 μm.
Claim 11
Dependent Claim
29 words
The method as claimed in claim 6, further comprising the step of electrically precharging said recording medium to a precharge potential at a point prior to said electrode assembly.
Claim 12
Dependent Claim
44 words
The method as claimed in claim 9, wherein said precharging step comprises precharging said recording medium to a first polarity and said generating step includes the step of applying a potential to said charging electrodes which is of opposite polarity to said first polarity.
Claim 13
Dependent Claim
39 words
The method as claimed in claim 9, wherein said generating step comprises applying a first potential to said charging electrodes and a second potential to said auxiliary electrodes and said precharge potential is between said first and second potentials.
References Cited (Backward Citations)
US3611419A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-10-09 | 1988-04-09 | 1988-10-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-10-09 | 1992-04-09 | 1992-10-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-10-09 | 1996-04-09 | 1996-10-09 | $7700.00 | Window Closed / Lapsed |