EP0639459A2 - Verfahren und Vorrichtung zum Betrieb von Hochgeschwindigkeits-Tintenstrahldruckern - Google Patents

Verfahren und Vorrichtung zum Betrieb von Hochgeschwindigkeits-Tintenstrahldruckern Download PDF

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Publication number
EP0639459A2
EP0639459A2 EP94305480A EP94305480A EP0639459A2 EP 0639459 A2 EP0639459 A2 EP 0639459A2 EP 94305480 A EP94305480 A EP 94305480A EP 94305480 A EP94305480 A EP 94305480A EP 0639459 A2 EP0639459 A2 EP 0639459A2
Authority
EP
European Patent Office
Prior art keywords
drops
print
ink
ink jet
drop
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.)
Withdrawn
Application number
EP94305480A
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English (en)
French (fr)
Other versions
EP0639459A3 (de
Inventor
William R. Bitticker
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Kodak Versamark Inc
Original Assignee
Kodak Versamark Inc
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Kodak Versamark Inc filed Critical Kodak Versamark Inc
Publication of EP0639459A2 publication Critical patent/EP0639459A2/de
Publication of EP0639459A3 publication Critical patent/EP0639459A3/de
Withdrawn legal-status Critical Current

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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

Definitions

  • the present invention relates to ink jet printers and, more particularly, to improved character pattern designs for high speed ink jet printers.
  • 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.
  • the row of continuous ink jets that are stimulated produce a two-dimensional array of ink drops that are directed to a print receiving medium.
  • the approach for printing with these droplet streams is to selectively charge and deflect certain drops from their normal trajectories.
  • a charge may be induced in a drop by a charging electrode associated with an adjacent jet.
  • This problem is known as crosstalk, and adversely affects print quality.
  • the effect of an unintentional charge so induced upon a charged drop, which is to be caught, is merely to alter its deflected trajectory slightly.
  • the catching arrangement is such that the drop will still be caught.
  • a print drop which is inadvertently charged by an adjacent charge electrode will be slightly deflected into a trajectory which will significantly affect the printing quality of the system.
  • serious print defects exist.
  • the defects consist of curved vertical segments and spaces between vertical and horizontal segments.
  • the object of the present invention is achieved by providing a high speed printing pattern for a continuous ink jet array that employs drops from adjacent jets but does not allow consecutive drops from a single jet.
  • the print head is driven with an inhibit function that prevents consecutive drops from a single jet or guard drops in the direction of the substrate, or copy receptor motion.
  • a method for improving print quality in a continuous multi-jet ink jet printer of the type including means for producing a rectangular array of ink drops, the array having columns corresponding to the consecutive drops in a single jet, and rows corresponding to drops simultaneously produced from all of the jets, where print drops and partially charged drops are printed on a print media and fully charged drops are deflected from the print media.
  • the method includes the steps of selecting one or more print drops for printing, and subjecting each of the one or more print drops to an approximately equal amount of partial charging.
  • ink is discharged from orifices in filaments which break into droplet streams.
  • the row of continuous ink jets produce a two-dimensional array of ink drops that are directed to a print receiving medium.
  • error deflection can be to the right or to the left of the desired print location.
  • the present invention provides an inhibit function that prevents consecutive drops from a single jet or guard drops in the direction of the substrate or copy receptor motion. That is, in accordance with the present invention, a high speed printing pattern for a continuous ink jet array employs drops from adjacent jets but does not allow consecutive drops from a single jet.
  • drop placement and drop formation diagrams are illustrated for a letter "T", with orifices labeled as rows 1 through 10, and paper motion indicated by columns A through J (excluding I).
  • Each square, indicated by a row number and a column letter, is termed a pixel.
  • error deflection can be to the right or to the left of the desired pixel or print location.
  • Fig. 1 there is illustrated ideal drop placement for the letter T, with the resulting drop formation shown in Fig. 2.
  • actual drop placement is dependent on a number of factors, including partial charging by adjacent jets. Therefore, all lateral neighbors of drops B2, C2, D2, F2, G2, and H2 have been fully charged, so that those drops receive a partial charge.
  • the partial charge causes those drops to be deflected to some degree before the drops reach the print media. The amount of deflection is dependent upon several factors, such as charge voltage, print head configuration, and print distance.
  • Fig. 3 the actual drop placement, because of the print conditions, shows error deflection of approximately one full pixel to the right, as compared to the desired drop placement illustrated in Fig. 1. Since drops E4, E5, E6 and E7 are adjacent to print drops, with very little, if any, charge, those drops will print near the locations where intended. Drops E2 and E9 have fully charged drops on one side, i.e., drops E1 and E10, respectively, drops E2 and E9 will nominally have a location error of approximately half as much as drops B2, C2, D2, F2, G2, and H2, causing drops E2 and E9 to print approximately on the boundary between pixel locations E and F. Drops E3 and E8 receive some charging from proximate drops E1 and E10, with the resulting error placement being less than 1/4 pixel. The resulting character formation due to the print errors is illustrated in Fig. 4.
  • Drops bounded by fully charged drops will have a partial charge. Drops bounded by two print drops on each side, or four print drops, will have very little or no charge. A print drop with any of its four neighbors fully charged will receive some partial charge.
  • Print errors are more noticeable for small characters with thin strokes, whereas the errors are not as great nor as visible for larger characters with thicker strokes.
  • the defects tend to be consistent throughout a particular set of smaller characters, and often become an acceptable part of the character set style appearance.
  • OCR optical character recognition
  • Fig. 9 meets those requirements. Because every drop is surrounded by fully charged drops, drop placement errors are nearly the same for each print drop, as seen in Fig. 8. That is, every print drop is deflected to the right by nearly one full pixel.
  • Figs. 5-7 The character bit map is shown in Fig. 5, with the expected drop placements shown in Fig. 6. Most of the drops in row 2 are deflected a full pixel, except drop 2E is deflected by less than a half pixel because most of its adjacent neighbor drops have not been charged. Drop 9D deflects nearly a full pixel, drop 9E only half a pixel, drop 8E about 1/4th of a pixel, and drops E4-7 not at all.
  • print quality for an ink jet printer is improved by selecting one or more print drops for printing, and subjecting each of the chosen print drops to an approximately equal amount of partial charging.
  • the drops are selected by determining which potential print drops will print at desired locations on the print media.
  • the print drops are subjected to an equal amount of partial charging by selectively creating one or more guard drops between the print drops in a row and one or more guard drops between the print drops in a column. This, then, reduces print error.
  • the present invention is particularly applicable to an ink jet printing apparatus which includes a print head for generating a plurality of continuous ink jets, arranged in a row and directed toward a print receiving medium.
  • the print head typically includes means for synchronously stimulating the ink jets to produce a rectangular array of ink drops, with the array having columns corresponding to the consecutive drops in a single jet, and rows corresponding to drops simultaneously produced from all of the jets.
  • Print drops and partially charged drops are printed on a print media and fully charged drops are deflected from the print media.
  • the print head further includes a plurality of drop charging electrodes positioned adjacent the row of ink jets.
  • the ink jet printing apparatus further includes means for selecting one or more print drops for printing, and means for subjecting each of the chosen print drops to an equal amount of partial charging.
  • the approach of the present invention of anticipating drop placement has more flexibility when the printer is operated in a printing mode using double resolution (dots/inch) across the character pattern, i.e., the direction of paper travel. That is, the numbered jets remain at a particular resolution (120 dots per inch, for example) and the drops (identified by letters) can be at 240 dots per inch.
  • OCR Optical Character Recognition
  • the present invention is useful in the field of ink jet printing, and has the advantage of improving the appearance of character patterns, particularly in high speed ink jet printers.

Landscapes

  • Particle Formation And Scattering Control In Inkjet Printers (AREA)
EP94305480A 1993-08-17 1994-07-25 Verfahren und Vorrichtung zum Betrieb von Hochgeschwindigkeits-Tintenstrahldruckern. Withdrawn EP0639459A3 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US10793493A 1993-08-17 1993-08-17
US107934 1993-08-17

Publications (2)

Publication Number Publication Date
EP0639459A2 true EP0639459A2 (de) 1995-02-22
EP0639459A3 EP0639459A3 (de) 1996-10-16

Family

ID=22319264

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94305480A Withdrawn EP0639459A3 (de) 1993-08-17 1994-07-25 Verfahren und Vorrichtung zum Betrieb von Hochgeschwindigkeits-Tintenstrahldruckern.

Country Status (1)

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EP (1) EP0639459A3 (de)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0891009A3 (de) * 1997-06-24 2000-03-29 Shimano Inc. Flachkabelverbinder für ein Fahrrad
EP1316429A1 (de) * 1998-09-03 2003-06-04 Videojet Technologies Inc. Tintenstrahldrucksystem
US7943813B2 (en) 2002-12-30 2011-05-17 Kimberly-Clark Worldwide, Inc. Absorbent products with enhanced rewet, intake, and stain masking performance
US8273066B2 (en) 2003-07-18 2012-09-25 Kimberly-Clark Worldwide, Inc. Absorbent article with high quality ink jet image produced at line speed
JP2022112570A (ja) * 2021-01-22 2022-08-03 紀州技研工業株式会社 インクジェットプリンタ
CN115157658A (zh) * 2022-06-23 2022-10-11 浙江大学 一种微流控3d液滴打印制备二进制编码液滴阵列的方法

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4364058A (en) * 1979-10-29 1982-12-14 Fuji Xerox Co., Ltd. Ink drop charging device
US4490729A (en) * 1982-09-15 1984-12-25 The Mead Corporation Ink jet printer
US4555710A (en) * 1981-12-20 1985-11-26 Ricoh Company, Ltd. Charge-controlled ink-jet printing method and apparatus
US4613871A (en) * 1985-11-12 1986-09-23 Eastman Kodak Company Guard drops in an ink jet printer
EP0206614A1 (de) * 1985-06-11 1986-12-30 Domino Printing Sciences Plc Druckverfahren mit Hilfe eines kontinuierlichen Tintenstrahls

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4364058A (en) * 1979-10-29 1982-12-14 Fuji Xerox Co., Ltd. Ink drop charging device
US4555710A (en) * 1981-12-20 1985-11-26 Ricoh Company, Ltd. Charge-controlled ink-jet printing method and apparatus
US4490729A (en) * 1982-09-15 1984-12-25 The Mead Corporation Ink jet printer
EP0206614A1 (de) * 1985-06-11 1986-12-30 Domino Printing Sciences Plc Druckverfahren mit Hilfe eines kontinuierlichen Tintenstrahls
US4613871A (en) * 1985-11-12 1986-09-23 Eastman Kodak Company Guard drops in an ink jet printer

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0891009A3 (de) * 1997-06-24 2000-03-29 Shimano Inc. Flachkabelverbinder für ein Fahrrad
US6129580A (en) * 1997-06-24 2000-10-10 Shimano, Inc. Flat bicycle cable connector
EP1316429A1 (de) * 1998-09-03 2003-06-04 Videojet Technologies Inc. Tintenstrahldrucksystem
US7943813B2 (en) 2002-12-30 2011-05-17 Kimberly-Clark Worldwide, Inc. Absorbent products with enhanced rewet, intake, and stain masking performance
US8273066B2 (en) 2003-07-18 2012-09-25 Kimberly-Clark Worldwide, Inc. Absorbent article with high quality ink jet image produced at line speed
US9006509B2 (en) 2003-07-18 2015-04-14 Kimberly-Clark Worldwide, Inc. Absorbent article with high quality ink jet image produced at line speed
US9901492B2 (en) 2003-07-18 2018-02-27 Kimberly-Clark Worldwide, Inc. Absorbent article with high quality ink jet image produced at line speed
JP2022112570A (ja) * 2021-01-22 2022-08-03 紀州技研工業株式会社 インクジェットプリンタ
CN115157658A (zh) * 2022-06-23 2022-10-11 浙江大学 一种微流控3d液滴打印制备二进制编码液滴阵列的方法
CN115157658B (zh) * 2022-06-23 2023-11-24 浙江大学 一种微流控3d液滴打印制备二进制编码液滴阵列的方法

Also Published As

Publication number Publication date
EP0639459A3 (de) 1996-10-16

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