Patent US4434428A successfully refreshed from Google Patents.
US4434428A
Expired / Lapsed
US
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Deflection detector for ink jet printing apparatus
Assignee: Ricoh Co Ltd
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Filing: 1982-06-01
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Granted: 1984-02-28
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Expires: 2002-06-01
Abstract
Abstract A deflection detector for an ink jet printer comprises first and second plates made of an insulating material and bonded to each other. The first insulator plate is provided with at least two separate detection electrodes on its one surface and a shield electrode at its other surface, while the second insulator plate is provided with a shield plate on its one surface and bonded to the first plate at the other surface. The first and second plates are formed with aligned slots which also extend throughout the electrodes to pass ink droplets therethrough. The thickness of each detection electrodes corresponds to an interval between successive ink droplets. The deflection detector is positioned such that the plate containing the detection electrodes is substantially perpendicular to a specific reference path for deflection.
Inventors
- 👤 Masanori Horike
- 👤 Yutaka Ebi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 08:39
CPC Classifications
B; B41; B41J; B41J2/00; B41J2/005; B41J2/01; B41J2/07; B41J2/125
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
79 words
A deflection detector for an ink jet printing apparatus, comprising: a first layer of an insulating material which carries on one surface thereof at least two flat and thin separate detection electrodes, and a second layer of an insulating material which is engaged with said detection electrodes at one surface thereof, said first and second insulator layers being formed with aligned slots which extend throughout the insulator layers and the detection electrodes to allow ink droplets to pass therethrough.
Claim 2
Dependent Claim
79 words
A deflection detector for an ink jet printing apparatus, comprising: a first layer of an insulating material which carries on one surface thereof at least two flat and thin separate detection electrodes, and a second layer of an insulating material which is engaged with said detection electrodes at one surface thereof, said first and second insulator layers being formed with aligned slots which extend throughout the insulator layers and the detection electrodes to allow ink droplets to pass therethrough.
Claim 3
Dependent Claim
37 words
A deflection detector as claimed in claim 1, in which each of the first and second insulator layers is provided with a shield electrode on the other surface thereof, the slot extending also through said shield electrode.
Claim 4
Dependent Claim
37 words
A deflection detector as claimed in claim 1, in which the deflection detector is positioned to have said one surface of the first insulator layer located substantially perpendicular to a reference deflection path for charged ink droplets.
Claim 5
Dependent Claim
27 words
A deflection detector as claimed in claim 1, in which each of the first and second insulator layers is constituted by a plate of glass epoxy resin.
Claim 6
Dependent Claim
24 words
A deflection detector as claimed in claim 1, in which each of the first and second insulator layers is constituted by a ceramic plate.
Claim 7
Dependent Claim
128 words
An ink jet printing apparatus comprising: an ink ejection head for ejecting a jet of ink, charging means for electrostatically and selectively charging ink droplets successively separated from the jet of ink, deflection means for electrostatically deflecting the charged ink droplets, and deflection detector for detecting an amount of deflection of the charged ink droplets, said deflection detector having a first layer of an insulating material which carries on one surface thereof at least two flat and thin separate detection electrodes, and a second layer of an insulating material which is engaged with said detection electrodes at one surface thereof, said first and second insulator layers being formed with aligned slots which extend throughout the insulator layers and the detection electrodes to allow ink droplets to pass therethrough.
Claim 8
Dependent Claim
128 words
An ink jet printing apparatus comprising: an ink ejection head for ejecting a jet of ink, charging means for electrostatically and selectively charging ink droplets successively separated from the jet of ink, deflection means for electrostatically deflecting the charged ink droplets, and deflection detector for detecting an amount of deflection of the charged ink droplets, said deflection detector having a first layer of an insulating material which carries on one surface thereof at least two flat and thin separate detection electrodes, and a second layer of an insulating material which is engaged with said detection electrodes at one surface thereof, said first and second insulator layers being formed with aligned slots which extend throughout the insulator layers and the detection electrodes to allow ink droplets to pass therethrough.
Claim 9
Dependent Claim
36 words
An apparatus as claimed in claim 6, in which each of the first and second insulator layers is formed with a shield electrode on the other surface thereof, the slot extending also through said shield electrode.
Claim 10
Dependent Claim
36 words
An apparatus as claimed in claim 6, in which the deflection detector is positioned to have said one surface of the first insulator layer located substantially perpendicular to a reference deflection path for charged ink droplets.
Claim 11
Dependent Claim
26 words
An apparatus as claimed in claim 6, in which each of the first and second insulator layers is constituted by a plate of glass epoxy resin.
Claim 12
Dependent Claim
23 words
An apparatus as claimed in claim 6, in which each of the first and second insulator layers is constituted by a ceramic plate.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-02-27 | 1987-08-29 | 1988-02-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-02-27 | 1991-08-29 | 1992-02-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-02-27 | 1995-08-29 | 1996-02-28 | $7700.00 | Window Closed / Lapsed |