EP0983855A2 - Substitution de points pour la compensation des buses à jet d'encre défaillantes - Google Patents

Substitution de points pour la compensation des buses à jet d'encre défaillantes Download PDF

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Publication number
EP0983855A2
EP0983855A2 EP99306367A EP99306367A EP0983855A2 EP 0983855 A2 EP0983855 A2 EP 0983855A2 EP 99306367 A EP99306367 A EP 99306367A EP 99306367 A EP99306367 A EP 99306367A EP 0983855 A2 EP0983855 A2 EP 0983855A2
Authority
EP
European Patent Office
Prior art keywords
black
printing
color
dots
constituent
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Withdrawn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
EP99306367A
Other languages
German (de)
English (en)
Other versions
EP0983855A3 (fr
Inventor
Bruce Michael Eckard
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.)
HP Inc
Original Assignee
Hewlett Packard Co
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 Hewlett Packard Co filed Critical Hewlett Packard Co
Publication of EP0983855A2 publication Critical patent/EP0983855A2/fr
Publication of EP0983855A3 publication Critical patent/EP0983855A3/fr
Withdrawn legal-status Critical Current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
    • B41J2/21—Ink jet for multi-colour printing
    • B41J2/2103—Features not dealing with the colouring process per se, e.g. construction of printers or heads, driving circuit adaptations
    • 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
    • B41J2/21—Ink jet for multi-colour printing
    • B41J2/2132—Print quality control characterised by dot disposition, e.g. for reducing white stripes or banding
    • B41J2/2139—Compensation for malfunctioning nozzles creating dot place or dot size errors

Definitions

  • the disclosed invention relates to ink jet printing devices, and more particularly to techniques for maintaining throughput when inoperative nozzles are present.
  • An ink jet printer forms a printed image by printing a pattern of individual dots at particular locations of a pixel array defined for the printing medium.
  • the locations are conveniently visualized as being small dots in a rectilinear array.
  • the locations are sometimes called “dot locations,” “dot positions,” or “pixels”.
  • the printing operation can be viewed as the filling of a pattern of dot locations with dots of ink.
  • Ink jet printers print dots by ejecting very small drops of ink onto the print medium, and typically include a movable carriage that supports one or more printheads each having ink ejecting nozzles.
  • the carriage traverses over the surface of the print medium, and the nozzles are controlled to eject drops of ink at appropriate times pursuant to command of a microcomputer or other controller, wherein the timing of the application of the ink drops is intended to correspond to the pattern of pixels of the image being printed.
  • Color ink jet printers commonly employ a plurality of printheads mounted in the print carriage to produce a full spectrum of colors. For example, in a printer with four printheads, each printhead can provide a different color output, with the commonly used base colors being cyan, magenta, yellow and black. In a printer with two printheads, one printhead provides a black output, while the other provides cyan, magenta and yellow outputs from respective nozzle sub-arrays.
  • the base colors are produced on the media by depositing a drop of the required color onto a pixel location, while secondary or shaded colors are formed by depositing multiple drops of different base colors onto the same or an adjacent pixel location, with the overprinting of two or more base colors producing the secondary colors according to well established optical principles. That is, dots of a base color are produced by depositing a drop of the required color, while dots of secondary or shaded colors are formed by depositing multiple drops of different base colors.
  • a dot of a secondary or shaded color can also be considered as a plurality of overlapping dots each of which is of a base color.
  • a consideration with ink jet printers that include black printing nozzle arrays and non-black color printing nozzle arrays is the failure of one or more black printing nozzles, which if not compensated would result in image defects such as missing lines in black areas such as text.
  • a known compensation technique is multiple pass print modes, which results in increased print times and decreases in throughput.
  • the disclosed invention is directed to an ink jet printer wherein inoperative black printing nozzles are detected, and substitute dots formed of non-black ink are printed at pixel locations that normally would be printed with the inoperative black nozzles, wherein each substitute dot formed of non-black ink is formed by at least one constituent non-black dot.
  • the substitute dots formed of non-black ink comprise composite or process black dots formed of two or more constituent non-black base colors.
  • such non-black base colors are selected from cyan, yellow, or magenta.
  • FIG. 1 is a perspective view of an ink jet large format printer/plotter 10 incorporating the teachings of the disclosed invention by which inoperative black printing nozzles are compensated without decreasing throughput.
  • the printer 10 includes a housing 12 mounted on a stand 14.
  • the housing has left and right drive mechanism enclosures 16 and 18.
  • a control panel 20 is mounted on the right enclosure 18.
  • a carriage assembly 100 illustrated in phantom under a cover 22, is adapted for reciprocal motion along a guide rail 24, also shown in phantom, which is parallel to a carriage scan axis, whereby the carriage assembly 100 moves along the carriage scan axis.
  • the position of the carriage assembly 100 in the carriage scan axis (or horizontal axis) is determined by a carriage positioning mechanism 110 (FIG. 2) with respect to an encoder strip 120 (FIG. 2) as discussed more fully below with respect to FIG. 2.
  • a print medium 30 such as paper is positioned along a vertical or media axis by a media axis drive mechanism that includes a print roller 154 (FIGS. 2 and 3).
  • FIG. 2 is a perspective view of the carriage assembly 100, the carriage positioning mechanism 110 and an encoder strip 120.
  • the carriage positioning mechanism 110 includes a carriage position motor 112 which has a shaft 114 extending therefrom through which the motor drives a small belt 116. Through the small belt 116, the carriage position motor 112 drives an idler 122 via the shaft 118 thereof. In turn, the idler 122 drives a belt 124 which is secured by a second idler 126.
  • the belt 124 is attached to the carriage assembly 100 and adapted to slide therethrough.
  • the position of the carriage assembly 100 in the carriage axis is determined precisely by the use of the encoder strip 120.
  • the encoder strip 120 is secured by a first stanchion 128 on one end and a second stanchion 129 on the other end.
  • the encoder strip 120 may be implemented in a manner disclosed and claimed in commonly assigned U.S. Patent No. 5,276,970, which is incorporated herein by reference.
  • a carriage axis encoder having an optical reader is disposed on the carriage assembly and provides carriage position signals.
  • the carriage assembly 100 removably supports four ink jet printhead cartridges or pens 102, 104, 106, and 108 that store ink of different colors (e.g., black, yellow, magenta and cyan ink, respectively). As the carriage assembly 100 translates along the carriage scan axis, selected ink firing resistors of the printheads of the printhead cartridges 102, 104, 106 and 108 are activated such that ink drops are fired through associated ink jet nozzles.
  • ink of different colors e.g., black, yellow, magenta and cyan ink, respectively.
  • FIG. 3 is a perspective view of a simplified representation of a media positioning system 150 utilized in the printer of FIG. 1.
  • the media positioning system 150 includes a media axis motor 152 that drives the print roller 154.
  • the position of the print roller 154 is determined by a media position encoder 156.
  • the media position encoder 156 includes a disc having a plurality of apertures 159 therein.
  • An optical reader 160 provides a plurality of output pulses which facilitate the determination of the position of the print roller 154 and, therefore, the position of the print medium 30 (FIG. 1) as well.
  • Position encoders are well known in the art. See for example, Economical High-Performance Optical Encoders by Howard C. Epstein et al., published in the Hewlett-Packard Journal, October 1988, pages 99-106.
  • an optical sensor module 200 is mounted on the carriage assembly 100.
  • the sensor module optically senses test lines printed by a printhead to determine printhead cartridge misalignments so that they can be corrected or compensated.
  • the sensor module 200 is implemented with a phase plate, and suitable processing circuitry is provided for processing the output thereof, as disclosed in commonly assigned U.S. Patent 5,404,020, incorporated herein by reference.
  • a modified print carriage 100a carries a removably mounted single color ink cartridge 130 (e.g., black printing) and a tri-compartment ink cartridge 132 that includes separate reservoirs 133, 134, 136 for different color inks such as cyan, magenta and yellow.
  • a removably mounted single color ink cartridge 130 e.g., black printing
  • a tri-compartment ink cartridge 132 that includes separate reservoirs 133, 134, 136 for different color inks such as cyan, magenta and yellow.
  • a further modified print carriage 100b carries a first tri-compartment ink cartridge 140 which has separate ink reservoirs 142, 144, 146 for different color inks such as yellow, light magenta, and dark magenta.
  • a second adjacent tri-compartment ink cartridge 150 includes separate ink reservoirs 152, 154, 156 for different color inks such as black, light cyan, and dark cyan.
  • the control system includes an interface 51 which receives print data from a host computer, for example, and stores the print data in a buffer memory 53.
  • a microprocessor controller 55 is configured to process the print data to produce raster data that is stored in a bit-map raster memory 57a contained in a random access memory (RAM) 57 provided for the use of the microprocessor controller 55.
  • RAM random access memory
  • a read-only memory 59 is also provided as appropriate for the use of the microprocessor controller 55.
  • a print controller 61 transfers portions of the raster data from the bit-map raster memory 57a to a swath memory 63 and provides swath data to a printhead driver controller 43 which controls printhead drivers 67 that drive the ink firing elements of printhead cartridges C1, C2, CN that are implemented as single color printhead cartridges and/or as multi-compartment cartridges, as described previously relative to FIGS 1-5.
  • the printhead cartridges C1, C2, CN include respective printheads P1, P2, PN and respective nozzle arrays N1, N2, NN that emit a single color or multiple colors, wherein for example a nozzle array the emits multiple colors is arranged in subarrays that emit ink drops of respective colors.
  • the printhead cartridges C1, C2, CN can comprise printhead cartridges that receive ink from respective remote ink reservoirs R1, R2, RN, for example via ink delivery tubes as is known in the art.
  • the printhead cartridges can comprise self-contained printhead cartridges that have on-board ink reservoirs that are not coupled to remote ink reservoirs.
  • the print controller 61 further controls the media axis drive motor 152 which moves the print roller 154 (FIGS. 2 and 3) pursuant to media motion commands from the print controller 61.
  • the media position encoder 156 provides information for the feedback control of the media axis drive motor 152.
  • a carriage axis encoder 73 provides feedback information for the feedback control of the carriage scan axis drive motor 112 which positions the ink jet cartridge supporting carriage assembly 100 (FIGS. 1-3) pursuant to carriage motion commands from the print controller 61.
  • a multi-channel analog-to-digital (A/D) converter 75 receives analog signals based on the outputs of the optical sensor 200 and provides digital versions of such analog signals for processing to determine the printhead cartridge misalignments.
  • the print controller further receives the output of an optical drop detect circuit 49 that is used to identify any inoperative nozzles of the print cartridges C
  • an optical drop detect circuit 49 is implemented in accordance with the optical elements and the optical drop detect circuit disclosed in U.S. Patents 5,455,608 and 5,434,430, all incorporated herein by reference.
  • the printer forms an image by scanning the print carriage along the carriage axis and printing dots at selected pixel locations P of a two-dimensional pixel array A defined for the print media.
  • the pixel locations or pixels P are arranged in rows and columns, wherein the rows are aligned with the carriage scan axis and the columns are aligned with the media axis.
  • the number of pixels per unit distance along the carriage scan axis is referred to as the carriage axis resolution, while the number of pixels per unit distance along the media axis is referred to as the media axis resolution.
  • the center to center distance between adjacent columns is the carriage axis dot pitch, while the center to center distance between adjacent rows is the media axis dot pitch. Any given row is printed in at least one pass or scan of the print carriage, and the media is appropriately advanced after at least one pass of the print carriage.
  • inoperative (or bad) true black printing nozzles are detected, and dots that would normally be printed with the inoperative true black printing nozzles are printed as substitute dots using one or more non-black color printing nozzles (e.g., or a single color ink cartridge or a multi-compartment ink cartridge), whereby dots that are not true black are substituted for true black dots that would otherwise have been printed using inoperative true black printing nozzles if such nozzles were operative, and wherein a substitute dot comprises one or more constituent non-black dots, each constituent non-black dot being formed of non-black ink.
  • non-black color printing nozzles e.g., or a single color ink cartridge or a multi-compartment ink cartridge
  • the substitute dot is formed of a plurality of constituent non-black dots
  • the plurality of constituent non-black dots are overlapping and the substitute dot can be referred to as a composite substitute dot.
  • a constituent non-black dot can be formed of a single color such as cyan, magenta or yellow.
  • one or more non-black color printing nozzles are substituted for inoperative true black nozzles as to the printing of dots that would otherwise be printed using inoperative true black printing nozzles if such nozzles were operative, wherein each of the substitute non-black color printing nozzles prints with non-black ink, such as cyan, magenta, or yellow.
  • the substitute dots comprise process or composite black, wherein the substitute dots are printed using at least two non-black inks selected for example from cyan, magenta or yellow inks.
  • the substitute dots comprise composite or process black formed of a cyan dot, a magenta dot and a yellow dot, all of which overlap.
  • substitute non-black printing nozzles print substituted dots at predetermined pixel locations.
  • First substitute non-black printing nozzles of a first color can be disposed in a nozzle array that includes second substitute non-black printing nozzles of another color, for example in a multi-compartment cartridge.
  • Third substituted non-black printing nozzles can also be disposed in the nozzle array that contains the first substitute non-black printing nozzles and the second substitute non-black print nozzles.
  • substitute non-black printing nozzles of respectively different non-black colors can be disposed in respectively separate nozzle arrays, for example in respectively separate cartridges.
  • substitute cyan printing nozzles can be disposed in a nozzle array of a cyan printing cartridge
  • substitute magenta printing nozzles can disposed in a nozzle array of a magenta printing cartridge
  • substitute yellow printing nozzles can be disposed in a nozzle array of a yellow printing cartridge.
  • FIG. 8 set forth therein is a flow diagram of an illustrative process of operating an ink jet printer in accordance with the invention.
  • a user of the ink jet printer selects a desired print quality, for example, Best, Normal or Draft.
  • inoperative true black printing nozzles are identified by the drop detect circuit 49 (FIG. 6).
  • a determination is made as to whether the any black nozzles are inoperative. If no, then at 117 printing is performed using a standard print mode wherein substitute dots are not utilized. If the determination at 115 is yes, at 119 a determination is made as to whether the selected print quality is Best. If yes, at 121 printing is performed using a multi-pass print mode to compensate for the inoperative black printing nozzles.
  • printing is performed by using substitute dots formed of non-black ink for those dots that would normally be printed by the inoperative black printing nozzles if such nozzles were operative, wherein a substitute dot is formed of one or more non-black constituent dots. That is, one or more non-black printing nozzles are substituted for the inoperative true black printing nozzles.

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  • Engineering & Computer Science (AREA)
  • Quality & Reliability (AREA)
  • Ink Jet (AREA)
EP99306367A 1998-08-31 1999-08-12 Substitution de points pour la compensation des buses à jet d'encre défaillantes Withdrawn EP0983855A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US144577 1993-10-27
US14457798A 1998-08-31 1998-08-31

Publications (2)

Publication Number Publication Date
EP0983855A2 true EP0983855A2 (fr) 2000-03-08
EP0983855A3 EP0983855A3 (fr) 2000-08-02

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EP99306367A Withdrawn EP0983855A3 (fr) 1998-08-31 1999-08-12 Substitution de points pour la compensation des buses à jet d'encre défaillantes

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JP (1) JP2000071432A (fr)

Cited By (33)

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EP1151867A2 (fr) * 2000-05-01 2001-11-07 Canon Kabushiki Kaisha Appareil et méthode d'enregistrement
WO2002002331A1 (fr) * 2000-06-30 2002-01-10 Silverbrook Research Pty Ltd Tolerance de defaut pour jet d'encre au moyen de tuyaux adjacents
WO2002002330A1 (fr) * 2000-06-30 2002-01-10 Silverbrook Research Pty Ltd Tolerance aux anomalies d'une imprimante a jet d'encre par utilisation de points d'encre supplementaires
EP1211078A1 (fr) * 2000-11-29 2002-06-05 Hewlett-Packard Company Système de surveillance thermique pour l'évaluation de l'état de buse
WO2002062582A1 (fr) * 2001-02-06 2002-08-15 Silverbrook Research Pty. Ltd. Detection de buses engorgees
EP1303408A1 (fr) * 2000-06-30 2003-04-23 Silverbrook Research Pty. Limited Tolerance aux defauts d'impression par jets d'encre utilisant des gouttelettes surdimensionnees
EP1308280A2 (fr) * 2001-11-06 2003-05-07 Canon Kabushiki Kaisha Appareil d'enregistrement, méthode d'enregistrement et programme
EP1310373A2 (fr) * 2001-11-06 2003-05-14 Canon Kabushiki Kaisha Méthode de correction d'image pour système d'impression à jet d'encre
EP1308281A3 (fr) * 2001-11-06 2003-12-03 Canon Kabushiki Kaisha Appareil d'enregistrement, méthode d' enregistrement et programme
EP1308279A3 (fr) * 2001-11-06 2003-12-03 Canon Kabushiki Kaisha Méthode de correction d'image dans un appareil d'enregistrement à jet d'encre
AU2000253741B2 (en) * 2000-06-30 2004-05-06 Memjet Technology Limited Ink jet fault tolerance using extra ink dots
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KR100706709B1 (ko) * 2002-12-20 2007-04-11 실버브룩 리서치 피티와이 리미티드 과대 크기의 잉크방울을 이용한 잉크젯의 결함 보정
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Cited By (93)

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Publication number Priority date Publication date Assignee Title
EP1151867A2 (fr) * 2000-05-01 2001-11-07 Canon Kabushiki Kaisha Appareil et méthode d'enregistrement
EP1151867A3 (fr) * 2000-05-01 2001-12-19 Canon Kabushiki Kaisha Appareil et méthode d'enregistrement
US6908176B2 (en) 2000-05-01 2005-06-21 Canon Kabushiki Kaisha Recording apparatus and method
US7168782B2 (en) 2000-05-01 2007-01-30 Canon Kabushiki Kaisha Recording apparatus and method
EP1303408A1 (fr) * 2000-06-30 2003-04-23 Silverbrook Research Pty. Limited Tolerance aux defauts d'impression par jets d'encre utilisant des gouttelettes surdimensionnees
US7246871B2 (en) 2000-06-30 2007-07-24 Silverbrook Research Pty Ltd Method and apparatus for compensating for printhead damage
US6575549B1 (en) 2000-06-30 2003-06-10 Silverbrook Research Pty Ltd Ink jet fault tolerance using adjacent nozzles
AU2004203506B2 (en) * 2000-06-30 2004-09-16 Memjet Technology Limited Method for ink jet fault compensation using extra ink dots
AU2004233532B2 (en) * 2000-06-30 2005-02-24 Memjet Technology Limited A printing method including compensation for faulty printing devices
US8382232B2 (en) 2000-06-30 2013-02-26 Zamtec Ltd Method of operating printer with incorrectly operating nozzles
US7914104B2 (en) 2000-06-30 2011-03-29 Silverbrook Research Pty Ltd Method for operating a printer to compensate for incorrectly operating nozzles
US7540582B2 (en) 2000-06-30 2009-06-02 Silverbrook Research Pty Ltd Method for operating inkjet printer to compensate for printhead damage
US6428139B1 (en) 2000-06-30 2002-08-06 Silverbrook Research Pty Ltd. Ink jet fault tolerance using extra ink dots
EP1303408A4 (fr) * 2000-06-30 2004-09-15 Silverbrook Res Pty Ltd Tolerance aux defauts d'impression par jets d'encre utilisant des gouttelettes surdimensionnees
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WO2002002330A1 (fr) * 2000-06-30 2002-01-10 Silverbrook Research Pty Ltd Tolerance aux anomalies d'une imprimante a jet d'encre par utilisation de points d'encre supplementaires
AU2005202029B2 (en) * 2000-06-30 2006-08-17 Memjet Technology Limited A printing method with nozzle-fault compensation
US7075677B1 (en) 2000-06-30 2006-07-11 Silverbrook Research Pty Ltd Ink jet fault tolerance using oversize drops
AU2000253741B2 (en) * 2000-06-30 2004-05-06 Memjet Technology Limited Ink jet fault tolerance using extra ink dots
WO2002002331A1 (fr) * 2000-06-30 2002-01-10 Silverbrook Research Pty Ltd Tolerance de defaut pour jet d'encre au moyen de tuyaux adjacents
US6460964B2 (en) 2000-11-29 2002-10-08 Hewlett-Packard Company Thermal monitoring system for determining nozzle health
EP1211078A1 (fr) * 2000-11-29 2002-06-05 Hewlett-Packard Company Système de surveillance thermique pour l'évaluation de l'état de buse
CN1328054C (zh) * 2001-02-06 2007-07-25 西尔弗布鲁克研究有限公司 具有喷嘴防护装置的打印头
US6969145B2 (en) 2001-02-06 2005-11-29 Silverbrook Research Pty Ltd Nozzle guard for an ink jet printhead
AU2002224667B2 (en) * 2001-02-06 2005-01-20 Zamtec Limited Flooded nozzle detection
WO2002062582A1 (fr) * 2001-02-06 2002-08-15 Silverbrook Research Pty. Ltd. Detection de buses engorgees
US6679582B2 (en) 2001-02-06 2004-01-20 Silverbrook Research Pty, Ltd Flooded nozzle detection
US7461918B2 (en) 2001-02-06 2008-12-09 Silverbrook Research Pty Ltd Micro-electromechanical integrated circuit device for fluid ejection
US7874556B2 (en) 2001-02-06 2011-01-25 Silverbrook Research Pty Ltd Printer with reversible air flow sheet picker
US7431281B2 (en) 2001-02-07 2008-10-07 Silverbrook Research Pty Ltd Method of separating a sheet of print media from a stack of sheets
US7533877B2 (en) 2001-02-07 2009-05-19 Silverbrook Research Pty Ltd High speed printer with gas-operated sheet feeding
US7243916B2 (en) 2001-02-07 2007-07-17 Silverbrook Research Pty Ltd Apparatus for feeding sheets of media from a stack
EP1310373A2 (fr) * 2001-11-06 2003-05-14 Canon Kabushiki Kaisha Méthode de correction d'image pour système d'impression à jet d'encre
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JP2000071432A (ja) 2000-03-07

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