EP0613778B1 - Passivation layer for ceramic based charge plates - Google Patents
Passivation layer for ceramic based charge plates Download PDFInfo
- Publication number
- EP0613778B1 EP0613778B1 EP19940301322 EP94301322A EP0613778B1 EP 0613778 B1 EP0613778 B1 EP 0613778B1 EP 19940301322 EP19940301322 EP 19940301322 EP 94301322 A EP94301322 A EP 94301322A EP 0613778 B1 EP0613778 B1 EP 0613778B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- charge plate
- substrate
- polyimide
- ink jet
- charging electrodes
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
- B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
- B41J2/01—Ink jet
- B41J2/07—Ink jet characterised by jet control
- B41J2/075—Ink jet characterised by jet control for many-valued deflection
- B41J2/08—Ink jet characterised by jet control for many-valued deflection charge-control type
- B41J2/085—Charge means, e.g. electrodes
Definitions
- the present invention relates to continuous ink jet printers and, more particularly, to improved constructions for the charge plate structure in such printers.
- electrically conductive ink is supplied under pressure to a manifold region that distributes the ink to a plurality of orifices, typically arranged in a linear array(s).
- the ink discharges from the orifices in filaments which break into droplet streams.
- Individual droplet streams are selectively charged in the region of the break off from the filaments and charge drops are deflected from their normal trajectories. The deflected drops may be caught and recirculated, and the undeflected drops allowed to proceed to a print receiving medium.
- Drops are charged by a charge plate having a plurality of charging electrodes along one edge, and a corresponding plurality of connecting leads along one surface.
- the edge of the charge plate having the charging electrodes is placed in close proximity to the break off point of the ink jet filaments, and charges applied to the leads to induce charges in the drops as they break off from the filaments.
- charge plates are presently coated with multiple wet layers, such as a photoresist available as KTFR Photoresist from Union Carbide Corporation, lacquers, and epoxies.
- a photoresist available as KTFR Photoresist from Union Carbide Corporation, lacquers, and epoxies.
- Such coatings provide insufficient protection of the charge leads as compared to a solid layer of polyimide.
- Wet coatings are prone to pinholing, and marginal adhesion, are not easily controllable and have erratic results. Coatings applied by wet methods inherently form an uneven interface at the leading edge of the coating on the charge plate surface where the conductors form a 90° angle.
- a solid layer of polyimide is convenient to apply, assures good adhesion, and eliminates pinholes.
- Polyimide sheet can be preformed to establish the desired interface with the charge plate surface. The setback distance and coating angle on the top charge plate surface can be control led by cutting the polyimide sheet to the exact size and shape required.
- a charge plate according to the present invention is provided with a polyimide dry film lamination which provides improved adhesion and impervious protection from ink.
- the invention provides a method of making a charge plate for use in an ink jet printer, comprising the steps of forming a charge plate having a plurality of charging electrodes along an edge of a ceramic substrate and a corresponding plurality of conductive leads on a surface of said substrate, precleaning the surface to ensure complete wettability; and laminating a polyimide dry film layer by heating and applying pressure.
- the invention further provides a charge plate for use in an ink jet printer as claimed in claim 3 below.
- fig 1 illustrates a partial schematic cross-sectional diagram of a charge plate fabricated according to the present invention.
- charge plate 10 cooperates with other known components used in continuous ink jet printers. That is, the charge plate 10 functions with a drop generator, drop catcher (which may be integral with the charge plate), media feed station, and data handling and machine control electronics (not shown) to selectively charge the drops to effect ink jet printing.
- the charge plate 10 includes an insulating substrate 12 on which are formed conductive leads 14 and drop charging electrodes 16.
- the conductive leads 14 and drop charging electrodes 16 are covered by a protective layer 18 of adhesively bonded polyimide film.
- the laminating is preferably by means of heat and pressure.
- the charge plate shown in Fig. 1 is fabricated in the following manner.
- the charge plate is formed (20) with the leads and charging electrodes preferably as shown in U.S. Patent 4,560,991.
- the charge plate is precleaned (22) to insure complete wettability of the top surface bearing the conductive leads 14, thereby assuring that the lamination to follow covers all conductive leads.
- the top of the charge plate is next laminated with a protective layer of adhesively bonded polyimide film (24).
- the polyimide film is bonded to the charge plate (26) by applying sufficient heat and pressure.
- the polyimide is bonded to the charge plate by applying approximately 250 pounds per square inch of pressure at approximately 350°F for approximately fifteen minutes, and then cooling the polyimide film to 250°F while maintaining pressure.
- the protective layer of adhesively bonded polyimide film can be applied using known techniques for laminating.
- the bonding can be applied in a hydraulic press having electrically heated platens, or in a hot roll continuous laminator.
- a preferred grade of adhesively bonded polyimide is R/flex R 2000 (a registered trademark of Rogers Corp, Chandler, Arizona) coverfilm, one to three mils thick, having one mil of acrylic B-staged adhesive.
- the present invention is useful in the field of ink jet printing, and has the advantage of providing improved protection of metallic charging leads from electrical short circuits.
- the present invention provides the further advantage of giving the charge plate circuitry impervious protection from ink.
- the polyimide film coating according to the present invention is compatible with the ink jet printing ink formulations available from Eastman Kodak Company.
- the preferred lamination means provides easily controllable, high uniform coverage, and the precleaning process insures complete coverage of the polyimide film coating.
Landscapes
- Particle Formation And Scattering Control In Inkjet Printers (AREA)
- Laminated Bodies (AREA)
Description
Claims (4)
- A method of making a charge plate for use in an ink jet printer, comprising the steps of:forming a charge plate (10) having a plurality of charging electrodes (16) along an edge of a ceramic substrate (12) and a corresponding plurality of conductive leads (14) on a surface of said substrate,precleaning the surface to ensure complete wettability; andlaminating a polyimide dry film (18) layer by heating and applying pressure.
- A method as claimed in claim 1, wherein the steps of heating and applying pressure comprise:applying approximately 1.7 MPa (250 pounds/sq.inch) of pressure at approximately 177 °C (350 °F) for approximately fifteen minutes; andcooling the polyimide film to 121 °C (250 °F) while maintaining the pressure.
- A charge plate for use in an ink jet printer comprising:an electrically insulating ceramic charge plate substrate (12);a plurality of charging electrodes (16) disposed along an edge of said charge plate substrate and a corresponding plurality of electrical leads (14) disposed on a surface of said charge plate substrate; andan adhesively bonded polyimide dry film (18) layer.
- A charge plate as claimed in claim 4 or 5, wherein said charging electrodes (16) are nickel.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US2454893A | 1993-03-01 | 1993-03-01 | |
US24548 | 1993-03-01 |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0613778A2 EP0613778A2 (en) | 1994-09-07 |
EP0613778A3 EP0613778A3 (en) | 1995-04-05 |
EP0613778B1 true EP0613778B1 (en) | 1998-06-10 |
Family
ID=21821173
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19940301322 Expired - Lifetime EP0613778B1 (en) | 1993-03-01 | 1994-02-24 | Passivation layer for ceramic based charge plates |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP0613778B1 (en) |
DE (1) | DE69410852T2 (en) |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB9404741D0 (en) * | 1994-03-10 | 1994-04-27 | Domino Printing Sciences Plc | Electrode assembly for a continuous ink jet printer |
DE69609248T2 (en) * | 1995-05-26 | 2001-03-08 | Scitex Digital Printing, Inc. | Process for the production of charge electrodes |
DE69613761T2 (en) * | 1995-05-26 | 2001-10-25 | Scitex Digital Printing, Inc. | Process for the production of charge electrodes |
US6234612B1 (en) * | 1997-03-25 | 2001-05-22 | Lexmark International, Inc. | Ink jet printing apparatus having first and second print cartridges receiving energy pulses from a common drive circuit |
US7156488B2 (en) * | 2004-05-05 | 2007-01-02 | Eastman Kodak Company | Ink repellent coating on charge device to improve printer runability and printhead life |
US20060082620A1 (en) | 2004-10-15 | 2006-04-20 | Eastman Kodak Company | Charge plate fabrication technique |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4419674A (en) * | 1982-02-12 | 1983-12-06 | Mead Corporation | Wire wound flat-faced charge plate |
DE3480073D1 (en) * | 1983-07-27 | 1989-11-16 | Eastman Kodak Co | A charge electrode structure for ink jet printers, and a method of fabricating the same |
US4560991A (en) * | 1983-07-27 | 1985-12-24 | Eastman Kodak Company | Electroformed charge electrode structure for ink jet printers |
EP0153436B1 (en) * | 1984-02-27 | 1990-04-04 | Codi-Jet Markierungs Systeme GmbH | Ink jet printer |
US4587527A (en) * | 1985-05-15 | 1986-05-06 | Eastman Kodak Company | Charging electrodes bearing a doped semiconductor coating |
JPH03218630A (en) * | 1990-01-24 | 1991-09-26 | Matsushita Electric Works Ltd | Semiconductor device having high breakdown strength |
-
1994
- 1994-02-24 DE DE1994610852 patent/DE69410852T2/en not_active Expired - Lifetime
- 1994-02-24 EP EP19940301322 patent/EP0613778B1/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
DE69410852D1 (en) | 1998-07-16 |
EP0613778A3 (en) | 1995-04-05 |
EP0613778A2 (en) | 1994-09-07 |
DE69410852T2 (en) | 1998-10-08 |
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