WO2002002329A1 - Ink jet fault tolerance using oversize drops - Google Patents
Ink jet fault tolerance using oversize drops Download PDFInfo
- Publication number
- WO2002002329A1 WO2002002329A1 PCT/AU2000/000750 AU0000750W WO0202329A1 WO 2002002329 A1 WO2002002329 A1 WO 2002002329A1 AU 0000750 W AU0000750 W AU 0000750W WO 0202329 A1 WO0202329 A1 WO 0202329A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- dots
- devices
- dot
- size
- printer
- Prior art date
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
Description
Claims
Priority Applications (10)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2002506937A JP2004501007A (en) | 2000-06-30 | 2000-06-30 | Anti-defect resistance of inkjet using huge ink droplets |
CNB008197075A CN1182964C (en) | 2000-06-30 | 2000-06-30 | Ink jet fault tolerance using oversize drops |
EP00938323A EP1303408B1 (en) | 2000-06-30 | 2000-06-30 | Ink jet fault tolerance using oversize drops |
AU5374000A AU5374000A (en) | 2000-06-30 | 2000-06-30 | Ink jet fault tolerance using oversize drops |
DE60030484T DE60030484T2 (en) | 2000-06-30 | 2000-06-30 | INK ERROR TOLERANCE USING DROPS IN OVER SIZE |
IL15343200A IL153432A (en) | 2000-06-30 | 2000-06-30 | Air supply arrangement for a printer |
PCT/AU2000/000750 WO2002002329A1 (en) | 2000-06-30 | 2000-06-30 | Ink jet fault tolerance using oversize drops |
AU2000253740A AU2000253740B2 (en) | 2000-06-30 | 2000-06-30 | Ink jet fault tolerance using oversize drops |
ZA200210189A ZA200210189B (en) | 2000-06-30 | 2002-12-17 | Ink jet fault tolerance using oversize drops. |
IL166720A IL166720A (en) | 2000-06-30 | 2005-02-07 | Method for ink jet print image compensation |
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 (1)
Publication Number | Publication Date |
---|---|
WO2002002329A1 true WO2002002329A1 (en) | 2002-01-10 |
Family
ID=3700831
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/AU2000/000750 WO2002002329A1 (en) | 2000-06-30 | 2000-06-30 | Ink jet fault tolerance using oversize drops |
Country Status (8)
Country | Link |
---|---|
EP (1) | EP1303408B1 (en) |
JP (1) | JP2004501007A (en) |
CN (1) | CN1182964C (en) |
AU (2) | AU2000253740B2 (en) |
DE (1) | DE60030484T2 (en) |
IL (1) | IL166720A (en) |
WO (1) | WO2002002329A1 (en) |
ZA (1) | ZA200210189B (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1384585A1 (en) * | 2002-07-24 | 2004-01-28 | Canon Kabushiki Kaisha | Ink jet printing apparatus and ink jet printing method |
EP1405727A1 (en) * | 2002-10-01 | 2004-04-07 | Sony Corporation | Liquid discharging apparatus and liquid discharging method |
Families Citing this family (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
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 |
US8985723B2 (en) | 2012-04-20 | 2015-03-24 | Xerox Corporation | System and method of compensating for defective inkjets |
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 | Error adjusting method for seamless splicing of ink-jet printing head |
CN114683726A (en) * | 2020-12-25 | 2022-07-01 | 深圳市汉森软件有限公司 | Image data packet printing method, device, control board, equipment and storage medium |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0710005A2 (en) * | 1994-10-31 | 1996-05-01 | Hewlett-Packard Company | Controlling dot size in image forming apparatus using lasers |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
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 |
-
2000
- 2000-06-30 JP JP2002506937A patent/JP2004501007A/en active Pending
- 2000-06-30 EP EP00938323A patent/EP1303408B1/en not_active Expired - Lifetime
- 2000-06-30 AU AU2000253740A patent/AU2000253740B2/en not_active Expired
- 2000-06-30 AU AU5374000A patent/AU5374000A/en active Pending
- 2000-06-30 CN CNB008197075A patent/CN1182964C/en not_active Expired - Lifetime
- 2000-06-30 WO PCT/AU2000/000750 patent/WO2002002329A1/en active IP Right Grant
- 2000-06-30 DE DE60030484T patent/DE60030484T2/en not_active Expired - Lifetime
-
2002
- 2002-12-17 ZA ZA200210189A patent/ZA200210189B/en unknown
-
2005
- 2005-02-07 IL IL166720A patent/IL166720A/en not_active IP Right Cessation
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0710005A2 (en) * | 1994-10-31 | 1996-05-01 | Hewlett-Packard Company | Controlling dot size in image forming apparatus using lasers |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1384585A1 (en) * | 2002-07-24 | 2004-01-28 | Canon Kabushiki Kaisha | Ink jet printing apparatus and ink jet printing method |
US7201462B2 (en) | 2002-07-24 | 2007-04-10 | Canon Kabushiki Kaisha | Ink jet printing apparatus and method for correcting ejection driving |
CN1318216C (en) * | 2002-07-24 | 2007-05-30 | 佳能株式会社 | Ink jet recorder and ink jet recording method |
EP1405727A1 (en) * | 2002-10-01 | 2004-04-07 | Sony Corporation | Liquid discharging apparatus and liquid discharging method |
SG112895A1 (en) * | 2002-10-01 | 2005-07-28 | Sony Corp | Liquid discharging apparatus and liquid discharging method |
CN1305680C (en) * | 2002-10-01 | 2007-03-21 | 索尼公司 | Liquid discharging device and liquid discharging method |
US7407264B2 (en) | 2002-10-01 | 2008-08-05 | Sony Corporation | Liquid discharging apparatus and liquid discharging method |
Also Published As
Publication number | Publication date |
---|---|
IL166720A (en) | 2007-10-31 |
JP2004501007A (en) | 2004-01-15 |
CN1454148A (en) | 2003-11-05 |
EP1303408B1 (en) | 2006-08-30 |
DE60030484D1 (en) | 2006-10-12 |
EP1303408A4 (en) | 2004-09-15 |
AU2000253740B2 (en) | 2004-05-06 |
DE60030484T2 (en) | 2007-03-29 |
EP1303408A1 (en) | 2003-04-23 |
AU5374000A (en) | 2002-01-14 |
ZA200210189B (en) | 2003-08-27 |
CN1182964C (en) | 2005-01-05 |
AU2000253740A1 (en) | 2002-04-11 |
IL166720A0 (en) | 2006-01-15 |
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