EP1303408A1 - Ink jet fault tolerance using oversize drops - Google Patents

Ink jet fault tolerance using oversize drops

Info

Publication number
EP1303408A1
EP1303408A1 EP00938323A EP00938323A EP1303408A1 EP 1303408 A1 EP1303408 A1 EP 1303408A1 EP 00938323 A EP00938323 A EP 00938323A EP 00938323 A EP00938323 A EP 00938323A EP 1303408 A1 EP1303408 A1 EP 1303408A1
Authority
EP
European Patent Office
Prior art keywords
dots
devices
dot
size
printer
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.)
Granted
Application number
EP00938323A
Other languages
German (de)
French (fr)
Other versions
EP1303408B1 (en
EP1303408A4 (en
Inventor
Kia Silverbrook
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.)
Silverbrook Research Pty Ltd
Original Assignee
Silverbrook Research Pty Ltd
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 Silverbrook Research Pty Ltd filed Critical Silverbrook Research Pty Ltd
Priority to AT00938323T priority Critical patent/ATE337916T1/en
Publication of EP1303408A1 publication Critical patent/EP1303408A1/en
Publication of EP1303408A4 publication Critical patent/EP1303408A4/en
Application granted granted Critical
Publication of EP1303408B1 publication Critical patent/EP1303408B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

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
    • B41J2/2132—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
    • 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
    • B41J2/2121—Ink jet for multi-colour printing characterised by dot size, e.g. combinations of printed dots of different diameter
    • B41J2/2128—Ink jet for multi-colour printing characterised by dot size, e.g. combinations of printed dots of different diameter by means of energy modulation

Definitions

  • This invention relates to digital printing and more particularly to printing using devices which eject ink onto the printed substrate.
  • the invention is not limited to ink ejection devices and is also applicable to laser, light emitting diode printers and to digital photocopiers.
  • a printhead In ink ejection devices a printhead has an array of nozzles through which ink is selectively ejected onto the substrate as the substrate moves relative to the printhead.
  • the printhead may print by scanning across the substrate to print horizontal bands or, if it is a full page width printhead, it may pass along the length of the page.
  • a blocked nozzle will result in multiple horizontal blank lines, in the case of a scanning type printhead, or a blank vertical line in the case of a page width printhead. Such blank lines are undesirable since they detract from the printed result.
  • the present invention provides a method of modifying the printing of an image so as to reduce or effectively eliminate the visual effect of one or more such blocked nozzles apparent to the eye of an observer in normal use.
  • the invention is applicable to other forms of printing where a device, whether passive or active, is repeatedly used to produce dots of ink or the like on a substrate.
  • the invention has potential application to laser and LED type printers and photocopiers where a fault in the imaging drum or light source can result in repeated faults in the image produced.
  • image is to be understood to have a broad meaning and includes anything printed, such as text and line drawings. Disclosure of the Invention
  • the invention provides a method of modifying an image to be digitally printed by a printing device to compensate for failure to correctly print dots of ink at specific locations, the method including the steps of: a) identifying said specific location or locations, and b) adjusting the dot size of at least one a dot at a location adjacent or near to the respective specific location from that required by the image data.
  • the invention provides a printer having a row of activatable devices which, when activated, cause rows of dots to be deposited onto a substrate and means to move the substrate relative to the row of devices in a direction generally perpendicular to the row of dots, said printer including: a) means to determine if one or more of said devices is not operating correctly; and b) control means for analysing images or image data and for identifying a specific location or locations where a dot of ink should be printed by activation of a incorrectly operating device and for adjusting the size of dot produced by one or both of the devices on either side of the failed device. The incorrectly operating device will result in a defect line or lines in the image printed.
  • the dots in adjacent columns are preferably all adjusted in size. If there are a small minority of locations in the column of the incorrectly operating device which do not require ink, dots in adjacent columns may or may not be adjusted in size. Dots in more than the two adjacent columns may be adjusted in size. Dots in adjacent columns may be adjusted in size only if they are within predetermined vertical or horizontal distances or both of one or more specific location. For example only dots in the columns either side of the failed column may be adjusted in size but dots in those columns two or three rows above and/or below the respective location may be adjusted in size.
  • Figure 1 shows a schematic illustration of a set of nozzles of an ink jet printing head.
  • Figure 2 shows a schematic illustration of an array of ink dots formed by the printhead of Figure 1 without fault correction operational.
  • Figure 3 shows a schematic illustration of the same array of ink dots as in
  • Figure 2 formed by the printhead of Figure 1, but with fault correction operational.
  • Figure 4 shows a second schematic illustration of an array of ink dots formed by the printhead of Figure 1 without fault correction operational.
  • Figure 5 shows a schematic illustration of the same array of ink dots as in Figure 4 formed by the printhead of Figure 1 but with fault correction operational.
  • a printhead 10 has an array of ink jet nozzles 12 arranged in a singe line. For the purpose of explanation only 14 nozzles are shown but in practice there will be from tens to thousands of nozzles arranged in a line. Paper is passed underneath the printhead in a direction generally perpendicular to the line of ink jet nozzles, as indicated by arrow 14.
  • the printhead may be a stationary or a movable printhead. As the paper passes under the printhead the ink jet nozzles A to N are selectively operated to cause an array of ink dots to be placed on the paper. This array is a series of columns and rows, the spacing of which is dependent on the spacing of the inkjet nozzles and the minimum paper feed step respectively.
  • the printhead may be a page width printhead or a smaller printhead which scans across the page to lay down a series of transverse bands of printing.
  • inkjets a-g and i-n inclusive are operating correctly but, for whatever reason, inkjet h is not operating correctly or at all. It is also assumed that the diagnostic systems of the printer, which will be well understood by those skilled in the art, have detected that nozzle h is not functioning correctly. In most cases, a malfunctioning device will be partially or totally blocked resulting in insufficient or no ink being deposited on the paper.
  • FIG 2 which schematically shows a portion of printing performed by the printhead 10 without fault correction
  • h a blank column
  • i-n a blank line appearing in the printing depending on whether the printhead 10 is a full page width printhead or a scanning type printhead.
  • the unshaded circles numbered 16, 18, 20 and 22 represent drops of ink which should have been printed in column h but were not.
  • Figure 3 shows the same image printed by the printhead 10 but with fault correction according to an embodiment of the invention operational.
  • the ink drops in columns g and i are caused to be larger than normal, as will be explained below. This reduces the amount of white space between the dots and between the columns g and i.
  • the effect is that the un-printed column h is not apparent to the eye of the user.
  • the effect occurs at about 1600dpi and upwards.
  • the size increase may be less, such that the dots in each of the two columns of dots do not join, or maybe greater, such that adjacent dots overlap.
  • oversize drops will be deposited continuously by nozzles g and i. It will be appreciated that when ink dots are deposited less frequently the drop size of ink in columns g and i will only increase adjacent or near to areas where drops should occur in column h.
  • These oversize drops may extend into rows where no ink is intended in column h. Where ink is not intended in column h for large distances, preferably no oversize drops will be created in columns g and i.
  • dots of ink are required, but not printed, in column h at rows 1, 2, 3, 5 and 7, as indicated by open circles 30, 32, 34, 36 and 38.
  • dots in columns g and I are increased in size in rows above and below un-printed dots 30, 32, 34, 36 and 38. Because there are more dots in these columns than compared to the figure 2 and 3 prints, the oversize dots overlap more and reduce the white space to a greater extent.
  • normal or oversize dots may be printed in vacant locations, such as column g, rows 1 and 5 and column I rows 2, 3 and 7.
  • increased dot size is achieved by increasing the amount of ink ejected.
  • this may be achieved by increasing the duration of the heating current pulse.
  • this may be by increasing the driving voltage or current to cause greater distortion or by increasing the pulse duration.
  • the pulse width and/or driving voltage or current may be increased.
  • the invention is also applicable to situations where individual devices are producing too much ink, in which case the adjacent devices may be adjusted to reduce the dot size of ink dots produced.
  • this technique may be used with laser and LED printers and photocopiers and other types of digital printers where the placement of an ink dot is dependent on individual activation of a device or component.
  • an LED in a LED printer may fail or there may be a defect in the photoconductive imaging drum of a laser printer.
  • adjusting the size of adjacent dots can hide or reduce the visual effect of the defect in the device or component.
  • dot size may be modified by modulating the intensity and or total amount of the light falling on the corresponding portion of the photoelectric imaging drum.

Landscapes

  • Engineering & Computer Science (AREA)
  • Quality & Reliability (AREA)
  • Ink Jet (AREA)
  • Accessory Devices And Overall Control Thereof (AREA)
  • Facsimile Heads (AREA)
  • Fax Reproducing Arrangements (AREA)

Abstract

A printing method identifies where parts of an image will not be printed correctly due to partial or total device failure and if possible adjusts the size of ink dots in adjacent rows or columns so as to lessen the visual effect of failure to print at the original location.

Description

INK JET FAULT TOLERANCE USING OVERSIZE DROPS
Field of the Invention
This invention relates to digital printing and more particularly to printing using devices which eject ink onto the printed substrate. However, the invention is not limited to ink ejection devices and is also applicable to laser, light emitting diode printers and to digital photocopiers.
Background of the Invention In ink ejection devices a printhead has an array of nozzles through which ink is selectively ejected onto the substrate as the substrate moves relative to the printhead. The printhead may print by scanning across the substrate to print horizontal bands or, if it is a full page width printhead, it may pass along the length of the page. A blocked nozzle will result in multiple horizontal blank lines, in the case of a scanning type printhead, or a blank vertical line in the case of a page width printhead. Such blank lines are undesirable since they detract from the printed result.
The present invention provides a method of modifying the printing of an image so as to reduce or effectively eliminate the visual effect of one or more such blocked nozzles apparent to the eye of an observer in normal use. However, the invention is applicable to other forms of printing where a device, whether passive or active, is repeatedly used to produce dots of ink or the like on a substrate. The invention has potential application to laser and LED type printers and photocopiers where a fault in the imaging drum or light source can result in repeated faults in the image produced. As used above and throughout the description and claims the term image is to be understood to have a broad meaning and includes anything printed, such as text and line drawings. Disclosure of the Invention
In one broad form the invention provides a method of modifying an image to be digitally printed by a printing device to compensate for failure to correctly print dots of ink at specific locations, the method including the steps of: a) identifying said specific location or locations, and b) adjusting the dot size of at least one a dot at a location adjacent or near to the respective specific location from that required by the image data.
In another broad form the invention provides a printer having a row of activatable devices which, when activated, cause rows of dots to be deposited onto a substrate and means to move the substrate relative to the row of devices in a direction generally perpendicular to the row of dots, said printer including: a) means to determine if one or more of said devices is not operating correctly; and b) control means for analysing images or image data and for identifying a specific location or locations where a dot of ink should be printed by activation of a incorrectly operating device and for adjusting the size of dot produced by one or both of the devices on either side of the failed device. The incorrectly operating device will result in a defect line or lines in the image printed. Usually the incorrectly operating device will produce no ink or not enough ink and so a blank or faint line will be produced. To compensate adjacent ink dots will be caused to be larger than required by the raw image data. Conversely if the incorrectly operating device is producing oversized ink dots, the dot size of adjacent dots will be reduced.
Where a part of an image requires the incorrectly operating device to deposit a continuous or substantially continuous column of dots, the dots in adjacent columns are preferably all adjusted in size. If there are a small minority of locations in the column of the incorrectly operating device which do not require ink, dots in adjacent columns may or may not be adjusted in size. Dots in more than the two adjacent columns may be adjusted in size. Dots in adjacent columns may be adjusted in size only if they are within predetermined vertical or horizontal distances or both of one or more specific location. For example only dots in the columns either side of the failed column may be adjusted in size but dots in those columns two or three rows above and/or below the respective location may be adjusted in size.
Brief Description of the Drawings
The invention shall be better understood from the following non-limiting description of preferred embodiments and the drawings, in which
Figure 1 shows a schematic illustration of a set of nozzles of an ink jet printing head.
Figure 2 shows a schematic illustration of an array of ink dots formed by the printhead of Figure 1 without fault correction operational. Figure 3 shows a schematic illustration of the same array of ink dots as in
Figure 2 formed by the printhead of Figure 1, but with fault correction operational.
Figure 4 shows a second schematic illustration of an array of ink dots formed by the printhead of Figure 1 without fault correction operational.
Figure 5 shows a schematic illustration of the same array of ink dots as in Figure 4 formed by the printhead of Figure 1 but with fault correction operational.
Description of Preferred and Other Embodiments
Referring to Figure 1, a printhead 10 has an array of ink jet nozzles 12 arranged in a singe line. For the purpose of explanation only 14 nozzles are shown but in practice there will be from tens to thousands of nozzles arranged in a line. Paper is passed underneath the printhead in a direction generally perpendicular to the line of ink jet nozzles, as indicated by arrow 14. The printhead may be a stationary or a movable printhead. As the paper passes under the printhead the ink jet nozzles A to N are selectively operated to cause an array of ink dots to be placed on the paper. This array is a series of columns and rows, the spacing of which is dependent on the spacing of the inkjet nozzles and the minimum paper feed step respectively. Whilst it is preferred that the horizontal and vertical spacing of the dots is the same, this is not necessarily achievable due to the different sources of the spacing. The printhead may be a page width printhead or a smaller printhead which scans across the page to lay down a series of transverse bands of printing.
For the purposes of explanation it is assumed that inkjets a-g and i-n inclusive are operating correctly but, for whatever reason, inkjet h is not operating correctly or at all. It is also assumed that the diagnostic systems of the printer, which will be well understood by those skilled in the art, have detected that nozzle h is not functioning correctly. In most cases, a malfunctioning device will be partially or totally blocked resulting in insufficient or no ink being deposited on the paper.
Referring to Figure 2, which schematically shows a portion of printing performed by the printhead 10 without fault correction, there is a blank column, labelled "h" corresponding to inkjet h, whilst columns a-g and i-n have been correctly selectively printed. This leads to one or more blank lines appearing in the printing depending on whether the printhead 10 is a full page width printhead or a scanning type printhead. The unshaded circles numbered 16, 18, 20 and 22 represent drops of ink which should have been printed in column h but were not. Figure 3 shows the same image printed by the printhead 10 but with fault correction according to an embodiment of the invention operational.
Referring to Figure 3 the ink drops in columns g and i are caused to be larger than normal, as will be explained below. This reduces the amount of white space between the dots and between the columns g and i. The effect is that the un-printed column h is not apparent to the eye of the user. When printing on A4 or letter size paper for reading at normal distances, such as at 20 to 30cm, the effect occurs at about 1600dpi and upwards.
In the Figure 3 print, only dots intended to be printed anyway in columns g and i have been increased in size but it is within the scope of the invention that extra dots of ink, whether of normal size or of adjusted size, may be printed in the columns either side of the failed column in locations when the image data does not require a dot. As seen in figure 3 there are dots in the image at only about 50% of possible locations and so, even with oversize dots, there is still significant white space. This white space may be reduced by printing dots in vacant areas to reduce and/or break up the visual effect of the un-printed column The area of each adjusted size dot is preferably increased by about 50% but this may be more or less, as needed. The oversize dots in the two columns may just touch dots in the same column. However, the size increase may be less, such that the dots in each of the two columns of dots do not join, or maybe greater, such that adjacent dots overlap. Where ink dots are required in column h at frequent intervals oversize drops will be deposited continuously by nozzles g and i. It will be appreciated that when ink dots are deposited less frequently the drop size of ink in columns g and i will only increase adjacent or near to areas where drops should occur in column h. These oversize drops may extend into rows where no ink is intended in column h. Where ink is not intended in column h for large distances, preferably no oversize drops will be created in columns g and i.
Referring to figures 4 and 5 there are shown a second set of schematic prints without and with fault correction respectively. As seen in figure 4, dots of ink are required, but not printed, in column h at rows 1, 2, 3, 5 and 7, as indicated by open circles 30, 32, 34, 36 and 38. In figure 5 dots in columns g and I are increased in size in rows above and below un-printed dots 30, 32, 34, 36 and 38. Because there are more dots in these columns than compared to the figure 2 and 3 prints, the oversize dots overlap more and reduce the white space to a greater extent. Again, if desired, normal or oversize dots may be printed in vacant locations, such as column g, rows 1 and 5 and column I rows 2, 3 and 7.
In the case of ink ejection type printers, increased dot size is achieved by increasing the amount of ink ejected. In the case of thermal ink ejection devices this may be achieved by increasing the duration of the heating current pulse. In the case of piezo electric ink ejection devices this may be by increasing the driving voltage or current to cause greater distortion or by increasing the pulse duration. Similarly with mechanical type ink ejection devices the pulse width and/or driving voltage or current may be increased.
The invention is also applicable to situations where individual devices are producing too much ink, in which case the adjacent devices may be adjusted to reduce the dot size of ink dots produced.
It will also be appreciated that this technique may be used with laser and LED printers and photocopiers and other types of digital printers where the placement of an ink dot is dependent on individual activation of a device or component. For example, an LED in a LED printer may fail or there may be a defect in the photoconductive imaging drum of a laser printer. In both cases, adjusting the size of adjacent dots can hide or reduce the visual effect of the defect in the device or component.
In the case of a laser or light emitting device type printer dot size may be modified by modulating the intensity and or total amount of the light falling on the corresponding portion of the photoelectric imaging drum.

Claims

I Claim:
1. A method of modifying an image to be digitally printed by a printing device to compensate for failure to correctly print dots of ink at specific locations, the method including the steps of: a) identifying said specific location or locations, and b) adjusting the dot size of at least one a dot at a location adjacent or near to the respective specific location from that required by the image data.
2. The method of claim 1 wherein the dot size of said adjusted dot or dots is increased if no dot or an undersize dot is printed at the respective specific location.
3. The method of claim 1 wherein the dot size of said adjusted dots is decreased if an oversize drop is printed at the respective specific location.
4. The method of claim 1 wherein dots located both transversely and longitudinally spaced from the respective location are adjusted in size.
5. The method of claim 1 wherein selected oversize adjusted dots contact or overlap adjacent dots.
6. The method of claim 1 wherein selected adjusted size dots do not contact or overlap adjacent dots.
7. A printer having a row of activatable devices which, when activated, cause rows of dots to be deposited onto a substrate and means to move the substrate relative to the row of devices in a direction generally perpendicular to the row of dots, said printer including: means to determine if one or more of said devices is not operating correctly; and control means for analysing images or image data and for identifying a specific location or locations where a dot of ink should be printed by activation of a incorrectly operating device and for adjusting the size of dot produced by one or both of the devices on either side of the failed device.
8. The printer of claim 7 wherein the control means adjusts the size of dots deposited in the same row as the respective specific location by one or both of the devices on either side of the failed device.
. The printer of claim 7 wherein the control means adjusts the size of dots deposited by one or both of the devices on either side of the failed device at least one row adjacent or near to the row of the respective specific location.
10. The printer of claim 7 wherein if no dot or an undersized dot is produced by activation of the incorrectly operating device the size of dots produced by activation of one or both of the devices adjacent to the incorrectly operating device is increased.
11. The printer of claim 7 wherein the devices are thermo mechanical ink ejection devices and said control system causes the ejection devices to be activated for a longer period of time or supplies a larger driving signal, or both.
12. The printer of claim 7 wherein said devices are light emitting devices and wherein the amount of light emitted by said light emitting devices is adjusted.
13. The printer of claim 7 wherein said devices are portions of a photoconductive imaging drum and the dot size of said adjusted dots is adjusted by varying the amount of light the respective device is exposed to.
14. The printer of claim 7 wherein at least some oversize adjusted dots contact or overlap with adjacent dots.
15. The printer of claim 7 wherein adjusted size dots do not overlap contact with adjacent dots.
EP00938323A 2000-06-30 2000-06-30 Ink jet fault tolerance using oversize drops Expired - Lifetime EP1303408B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT00938323T ATE337916T1 (en) 2000-06-30 2000-06-30 INKJET DEFECT TOLERANCE USING OVERSIZE DROPS

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/AU2000/000750 WO2002002329A1 (en) 2000-06-30 2000-06-30 Ink jet fault tolerance using oversize drops

Publications (3)

Publication Number Publication Date
EP1303408A1 true EP1303408A1 (en) 2003-04-23
EP1303408A4 EP1303408A4 (en) 2004-09-15
EP1303408B1 EP1303408B1 (en) 2006-08-30

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EP00938323A Expired - Lifetime EP1303408B1 (en) 2000-06-30 2000-06-30 Ink jet fault tolerance using oversize drops

Country Status (8)

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EP (1) EP1303408B1 (en)
JP (1) JP2004501007A (en)
CN (1) CN1182964C (en)
AU (2) AU5374000A (en)
DE (1) DE60030484T2 (en)
IL (1) IL166720A (en)
WO (1) WO2002002329A1 (en)
ZA (1) ZA200210189B (en)

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US7201462B2 (en) 2002-07-24 2007-04-10 Canon Kabushiki Kaisha Ink jet printing apparatus and method for correcting ejection driving
US7407264B2 (en) 2002-10-01 2008-08-05 Sony Corporation Liquid discharging apparatus and liquid discharging method
US8042899B2 (en) * 2008-03-17 2011-10-25 Xerox Corporation System and method for compensating for weak, intermittent, or missing inkjets in a printhead assembly
JP6232871B2 (en) * 2013-09-12 2017-11-22 セイコーエプソン株式会社 Inkjet printer and printing method
US10391784B2 (en) * 2015-10-08 2019-08-27 Kornit Digital Ltd. Concealing missing nozzles
DE102016203917A1 (en) * 2016-03-10 2017-09-14 Heidelberger Druckmaschinen Ag Method for compensating failed nozzles in an inkjet printing machine
JP6888244B2 (en) * 2016-03-28 2021-06-16 セイコーエプソン株式会社 Droplet ejection control device, droplet ejection control method, and droplet ejection device
DE102016211578A1 (en) * 2016-06-28 2017-12-28 Heidelberger Druckmaschinen Ag Pressure nozzle compensation by deviating pressure nozzles
DE102018202045A1 (en) * 2017-03-08 2018-09-13 Heidelberger Druckmaschinen Ag Multilevel density compensation for digital printing machines
DE102018201674A1 (en) * 2017-03-15 2018-09-20 Heidelberger Druckmaschinen Ag Missing Nozzle correction by multiple grid
CN108327402B (en) * 2018-01-11 2020-08-14 佛山希望数码印刷设备有限公司 Control method for ceramic ink-jet printing snapshot compensation chromatic aberration
CN111791608B (en) * 2020-09-10 2021-02-26 季华实验室 An error adjustment method for seamless splicing of inkjet print heads
CN114683726B (en) * 2020-12-25 2024-05-24 深圳市汉森软件股份有限公司 Image data grouping printing method, device, control panel, equipment and storage medium
DE102024122094A1 (en) * 2023-09-12 2025-03-13 Gallus Ferd. Rüesch AG Method for compensating a failed print nozzle of an inkjet print head

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US6069645A (en) * 1994-10-31 2000-05-30 Hewlett-Packard Company Method and apparatus for controlling dot size in image forming apparatus having an array of lasers
JP2000062159A (en) * 1998-08-17 2000-02-29 Oce Technol Bv Method for compensating failure of dot forming unit in printer
EP0983855A3 (en) * 1998-08-31 2000-08-02 Hewlett-Packard Company Dot substitution to compensate for failed ink jet nozzles
US6270187B1 (en) * 1998-12-14 2001-08-07 Hewlett-Packard Company Method and apparatus for hiding errors in single-pass incremental printing

Also Published As

Publication number Publication date
JP2004501007A (en) 2004-01-15
AU5374000A (en) 2002-01-14
EP1303408B1 (en) 2006-08-30
EP1303408A4 (en) 2004-09-15
AU2000253740A1 (en) 2002-04-11
IL166720A (en) 2007-10-31
DE60030484D1 (en) 2006-10-12
CN1454148A (en) 2003-11-05
AU2000253740B2 (en) 2004-05-06
IL166720A0 (en) 2006-01-15
ZA200210189B (en) 2003-08-27
WO2002002329A1 (en) 2002-01-10
DE60030484T2 (en) 2007-03-29
CN1182964C (en) 2005-01-05

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