US5196890A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrostatic recording having swingable recording electrodes to prevent deposit of magnetic toner on opposite electrode
Assignee: Casio Computer Co Ltd
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Filing: 1991-10-30
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Granted: 1993-03-23
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Expires: 2011-10-30
Abstract
Abstract An electrostatic recording apparatus includes a developing agent carrier member arranged along a predetermined developing agent convey path. A developing agent conveying section conveys a developing agent along a surface of the developing agent carrier member. A plurality of recording electrodes are arranged on the surface of the developing agent carrier member at a predetermined pitch. An opposite electrode is arranged to oppose the plurality of recording electrodes at a predetermined gap. A voltage applying section applies a voltage corresponding to recording information to each of the plurality of recording electrodes to selectively transfer the developing agent, which is conveyed along the surface of the developing agent carrier member, to the opposite electrode. The developing agent carrier member has a step at a portion on its surface shifted to an upstream side of a developing agent convey direction from a position closest to the opposite electrode. At least distal end portions of the plurality of recording electrodes project from this step toward the closest position to form projections. The projections are swingable in a direction of approaching or going away from the opposite electrode.
Inventors
- 👤 Kenji Nakayama
- 👤 Eiichi Takeuchi
- 👤 Shigeru Shimizu
- 👤 Tadao Yamamoto
- 👤 Hideaki Inoue
- 👤 Yasuhito Sato
- 👤 Hideki Takahashi
- 👤 Toshiro Honda
- 👤 Kenichiro Asako
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 07:57
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/22; G03G15/34; G03G15/344; G03G15/348; G03G15/06; G03G15/08; G03G15/09; G03G15/0921; G03G15/0928; G03G2217/00; G03G2217/0008; G03G2217/0016
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
222 words
An electrostatic recording apparatus comprising: developing agent carrier member having a surface and arranged along a predetermined developing agent convey path; developing agent conveying means for conveying a developing agent along said surface of said developing agent carrier member; a plurality of recording electrodes arranged on said surface of said developing agent carrier member at a predetermined pitch; an opposite electrode arranged to oppose said plurality of recording electrodes at a predetermined gap; voltage applying means for applying a voltage corresponding to recording information to each of said plurality of recording electrodes to selectively transfer the developing agent, which is conveyed along said surface of said developing agent carrier member, to said opposite electrode, thereby forming a recording image corresponding to the recording information on said opposite electrode; said developing agent carrier member having a step at a portion on said surface thereof shifted from a position closest to said opposite electrode to an upstream side of a developing agent convey direction, at least distal end portions of said plurality of recording electrodes project from said step toward said closest position to form projections, said projections being swingable in a direction toward and away from said opposite electrode during transfer of the developing agent from said surface to said opposite electrode to maintain said gap between said recording and opposite electrodes constant.
Claim 2
Dependent Claim
222 words
An electrostatic recording apparatus comprising: developing agent carrier member having a surface and arranged along a predetermined developing agent convey path; developing agent conveying means for conveying a developing agent along said surface of said developing agent carrier member; a plurality of recording electrodes arranged on said surface of said developing agent carrier member at a predetermined pitch; an opposite electrode arranged to oppose said plurality of recording electrodes at a predetermined gap; voltage applying means for applying a voltage corresponding to recording information to each of said plurality of recording electrodes to selectively transfer the developing agent, which is conveyed along said surface of said developing agent carrier member, to said opposite electrode, thereby forming a recording image corresponding to the recording information on said opposite electrode; said developing agent carrier member having a step at a portion on said surface thereof shifted from a position closest to said opposite electrode to an upstream side of a developing agent convey direction, at least distal end portions of said plurality of recording electrodes project from said step toward said closest position to form projections, said projections being swingable in a direction toward and away from said opposite electrode during transfer of the developing agent from said surface to said opposite electrode to maintain said gap between said recording and opposite electrodes constant.
Claim 3
Dependent Claim
29 words
An apparatus according to claim 1, further including an elastic portion on said surface of said developing agent carrier member in order to support at least said separate projections.
Claim 4
Dependent Claim
27 words
An apparatus according to claim 1, wherein said elastic portion is constituted on an elastic material having a modulus of elasticity E satisfying: 1×10.sup.6 ≦E≦3×10.sup.9 [N/m.sup.2 ].
Claim 5
Dependent Claim
218 words
An electrostatic recording apparatus comprising: developing agent carrier member having a surface and arranged along a predetermined developing agent convey path; developing agent conveying means for conveying a developing agent along said surface of said developing agent carrier member; a plurality of recording electrodes arranged on said surface of said developing agent carrier member at a predetermined pitch; an opposite electrode arranged to oppose said plurality of recording electrodes at a predetermined gap; and voltage applying means for applying a voltage corresponding to recording information to each of said plurality of recording electrodes to selectively transfer the developing agent, which is conveyed along said surface of said developing agent carrier member, to said opposite electrode, thereby forming a recording image corresponding to the recording information on said opposite electrode; wherein said developing agent carrier member has a step at a portion on said surface thereof shifted from a position closest to said opposite electrode to an upstream side of a developing agent convey direction, at least distal end portions of said plurality of recording electrodes project from said step toward said closest position to form projections, and said projections being swingable in a direction of approaching or going away from said opposite electrode, said projections comprising projections separate from each other and being swingable independently from each other.
Claim 6
Dependent Claim
218 words
An electrostatic recording apparatus comprising: developing agent carrier member having a surface and arranged along a predetermined developing agent convey path; developing agent conveying means for conveying a developing agent along said surface of said developing agent carrier member; a plurality of recording electrodes arranged on said surface of said developing agent carrier member at a predetermined pitch; an opposite electrode arranged to oppose said plurality of recording electrodes at a predetermined gap; and voltage applying means for applying a voltage corresponding to recording information to each of said plurality of recording electrodes to selectively transfer the developing agent, which is conveyed along said surface of said developing agent carrier member, to said opposite electrode, thereby forming a recording image corresponding to the recording information on said opposite electrode; wherein said developing agent carrier member has a step at a portion on said surface thereof shifted from a position closest to said opposite electrode to an upstream side of a developing agent convey direction, at least distal end portions of said plurality of recording electrodes project from said step toward said closest position to form projections, and said projections being swingable in a direction of approaching or going away from said opposite electrode, said projections comprising projections separate from each other and being swingable independently from each other.
Claim 7
Dependent Claim
39 words
An apparatus according to claim 4 wherein said opposite electrode has uneven surface portions, said projections being swingable to maintain said gap constant between said recording and opposite electrodes, including along said uneven surface portions of said opposite electrode.
Claim 8
Dependent Claim
25 words
An apparatus according to claim 1, wherein said projections comprise projections separate from each other, and said separate projections are swingable independently from each other.
Claim 9
Dependent Claim
29 words
An apparatus according to claim 1, further including an elastic portion on said surface of said developing agent carrier member in order to support at least said separate projections.
Claim 10
Dependent Claim
27 words
An apparatus according to claim 7, wherein said elastic portion is constituted of an elastic material having a modulus of elasticity E satisfying: 1×10.sup.6 ≦E≦3×10.sup.9 [N/m.sup.2 ].
Claim 11
Dependent Claim
39 words
An apparatus according to claim 1 wherein said opposite electrode has uneven surface portions, said projections being swingable to maintain said gap constant between said recording and opposite electrodes, including along said uneven surface portions of said opposite electrode.
References Cited (Backward Citations)
JPS5449141A
Cited
JPS59121362A
Cited
JPS60136775A
Cited
JPS63121863A
Cited
JPS63174081A
Cited
JPS6468770A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1996-03-22 | 1996-09-21 | 1997-03-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-03-22 | 2000-09-21 | 2001-03-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-03-22 | 2004-09-21 | 2005-03-23 | $7700.00 | Window Closed / Lapsed |