EP1418053A1 - Verfahren zum Verbessern der Bildrandqualität - Google Patents

Verfahren zum Verbessern der Bildrandqualität Download PDF

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Publication number
EP1418053A1
EP1418053A1 EP03078432A EP03078432A EP1418053A1 EP 1418053 A1 EP1418053 A1 EP 1418053A1 EP 03078432 A EP03078432 A EP 03078432A EP 03078432 A EP03078432 A EP 03078432A EP 1418053 A1 EP1418053 A1 EP 1418053A1
Authority
EP
European Patent Office
Prior art keywords
print head
pixels
printer
image
edge
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
EP03078432A
Other languages
English (en)
French (fr)
Other versions
EP1418053B1 (de
Inventor
André Van Doorn
Marwjin T.P. Christiaans
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.)
Canon Production Printing Netherlands BV
Original Assignee
Oce Technologies BV
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 Oce Technologies BV filed Critical Oce Technologies BV
Priority to EP20030078432 priority Critical patent/EP1418053B1/de
Publication of EP1418053A1 publication Critical patent/EP1418053A1/de
Application granted granted Critical
Publication of EP1418053B1 publication Critical patent/EP1418053B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • B41J2/485—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by the process of building-up characters or image elements applicable to two or more kinds of printing or marking processes
    • B41J2/505—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by the process of building-up characters or image elements applicable to two or more kinds of printing or marking processes from an assembly of identical printing elements
    • B41J2/5056—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by the process of building-up characters or image elements applicable to two or more kinds of printing or marking processes from an assembly of identical printing elements using dot arrays providing selective dot disposition modes, e.g. different dot densities for high speed and high-quality printing, array line selections for multi-pass printing, or dot shifts for character inclination
    • 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
    • B41J19/00—Character- or line-spacing mechanisms
    • B41J19/14—Character- or line-spacing mechanisms with means for effecting line or character spacing in either direction
    • B41J19/142—Character- or line-spacing mechanisms with means for effecting line or character spacing in either direction with a reciprocating print head printing in both directions across the paper width

Definitions

  • the invention relates to a method of printing, in particular to a method of bi-directional printing. More in particular, the invention relates to a method of printing using an ink-jet or laserjet printer having a resolution which is twice or more than twice the resolution of the input image.
  • Such methods are known for allowing e.g. a 600 dpi printer to print a 300 dpi bitmap.
  • a droplet discharged from a print head nozzle to form a pixel has a ball-shaped leading portion and an elongated tail portion. During falling this tail portion may divide itself into two or more droplet parts. Due to the fact that the print head performs a continuous movement during a printing stroke, the ball portion will reach the printing surface, in particular paper, before the tail or the droplet parts will do. The ball portion hits the paper at the desired location according to a grid based on the higher resolution of the printer to form a pixel. The remaining portions of the droplet, however, will hit the paper at locations spaced from the centre of the pixel in the direction of movement of the print head and form small satellite pixels.
  • double pixels for e.g. a 600 dpi resolution are printed using a reciprocating print head having two rows of nozzles arranged perpendicular to the direction of travel, in which -as seen in the direction of travel- the leading row of nozzles is activated for discharging ink droplets to form the pixel located at the trailing side of the double-pixel to be formed.
  • a reciprocating print head having two rows of nozzles arranged perpendicular to the direction of travel, in which -as seen in the direction of travel- the leading row of nozzles is activated for discharging ink droplets to form the pixel located at the trailing side of the double-pixel to be formed.
  • An object of the invention is to improve on this.
  • a further object of the invention is to provide a method of printing double or multiple pixels having sharp edges on both sides.
  • Yet another object of the invention is to provide a method of two pass bi-directional printing at a high frequency resulting in a high resolution image with sharp edged double or multiple pixels.
  • a method of printing pixel images on a sheet or web of paper using an ink-jet or laserjet printer said printer having means for storing an input image corresponding to the pixel image in the form of a first grid of imaginary lines according to a first resolution, said printer being adapted for printing said pixel image in the form of a second grid of imaginary lines according to a second resolution which is a plurality of the first resolution, said printer having a print head with at least one nozzle, wherein said printer is provided with control means for operating said print head in accordance with the input image recorded in said storing means, wherein said print head reciprocates across the sheet or web of paper along a first path in a first direction and along a second path in a second, opposite direction, wherein said pixel image has first pixels located at a first edge which forms an upstream edge with respect to the movement of the print head in the first direction and said pixel image has second pixels located at a second edge which forms an upstream edge with respect to the movement
  • the invention provides a method of printing pixel images on a sheet or web of paper using an ink-jet or laserjet printer, wherein said printer has a resolution which is a plurality of the resolution of the input image, said printer having a print head which reciprocates across the sheet or web of paper along a first path in a first direction and along a second path in a second, opposite direction, wherein said pixel images consist of a plurality of pixels located adjacent to each other as viewed in said first and second directions, including first and second pixels to be placed at the leading or upstream edges of the image in question as considered in the first and second directions, wherein the print head is controlled to discharge an ink droplet for forming the first and second pixels only when moving in the first and second directions, respectively.
  • the satellites will always hit the paper at a location which is within the intended area of the double or multiple pixel, in other words in the area which is indeed to be covered by ink.
  • the edges of the printed image will be sharp, without the printing speed having to be decelerated.
  • the second or printer resolution is twice the first or input image resoiution, in particular 600 dpi.
  • a print head having a first and a second row of nozzles arranged according to lines transverse to said first and second directions, wherein said first row of nozzles is located at the downstream side of the print head when moving in the first direction, wherein said second row of nozzles is located at the downstream side of the print head when moving in the second direction, wherein said first pixels are printed by activating the first row of nozzles and the second pixels are printed by the second row of nozzles.
  • FIG 1A the ink-jet or laserjet printer head 1 is shown during discharge of an ink droplet 2 from nozzle 10.
  • the droplet 2 has a lower, ball-shaped portion 3 and an elongated tail portion 4.
  • the droplet 2 After having travelled downwardly for a short period of time, the droplet 2, in particular the tail portion 4, will break up in two or more tail parts, as shown in figure 1B with tail part 4a and 4b.
  • the printer head 10 will travel in the direction A with respect to the papersheet 5, as result of which the ball portion 3 and the tail parts 4a, 4b will hit the papersheet 5 at locations spaced from each other in the direction A, as shown in figure 1C.
  • the printer head 1 is schematically shown having two rows h 1 , h 2 of nozzles 10a-h and 11a-h, which rows are spaced at a distance d from each other.
  • FIG 2A Also in figure 2A is shown the paper sheet 5 from above, as well as an imaginary grid 6 of gridlines 7 and gridlines 8, which are spaced from each other at a distance d.
  • d This example, which corresponds to a 600 dpi grid, d is 1/600 inch.
  • Figures 2A and 2B show the process in so called two path bidirectional printing. According to this process, printing of images is carried out in two overlapping swaths. A first swath in a direction from left to right (A) and in the second overlapping swath in the opposite direction (B).
  • nozzles 10a-h and 11a-h are active in the first swath and nozzles 10a-h and 11a-h are active in the second swath.
  • the -not shown-control system of the printer activates the nozzles 10a-h to discharge ink droplets 2 such that the ball portion 3 of the ink droplets will hit the paper sheet 5 at line 7a of the grid 6.
  • the tail parts 4a, 4b or satellites will hit the paper sheet 5 at the down stream side of the ball portions 3.
  • the printer head 1 In the return stroke, depictured in figure 2B, the printer head 1 is moved back in the direction B, and in that case the printer head 1 is activated to have the nozzles 11 a-h discharged ink droplets 2 such that the ball portions 3 of the ink droplets hit the paper sheet 5 at the grid line 7b.
  • the satellites 4a, 4b will hit the paper in area between lines 7a and 7b.
  • any image can be printed using the method according to the invention. Every image may have a dimension in moving direction of the printer head corresponding to a double pixei. Every image (600 dpi) is converted into an image of double pixels, the double pixels forming an image of 300 dpi. Even without knowing the exact outlines of an image part the invention ensures that the satellite pixels all will fall within the double pixel boundaries. In all these cases the printer head is activated such that the ink droplets that are required for forming the boundary lines 13a, 13b, of image 13 are discharged when the printer head moves in a direction A and B, respectively, with a result that the satellites 4a, 4b always hit the paper sheet in an area between the lines 13a and 13b.
  • the invention is described with an inkjet head having two rows of nozzles (10a-h; 11a-h) but also a head having a single row can be used for this invention.

Landscapes

  • Engineering & Computer Science (AREA)
  • Quality & Reliability (AREA)
  • Ink Jet (AREA)
  • Particle Formation And Scattering Control In Inkjet Printers (AREA)
EP20030078432 2002-11-06 2003-11-03 Verfahren zum Verbessern der Bildrandqualität Expired - Lifetime EP1418053B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP20030078432 EP1418053B1 (de) 2002-11-06 2003-11-03 Verfahren zum Verbessern der Bildrandqualität

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
EP02079712 2002-11-06
EP02079712 2002-11-06
EP20030078432 EP1418053B1 (de) 2002-11-06 2003-11-03 Verfahren zum Verbessern der Bildrandqualität

Publications (2)

Publication Number Publication Date
EP1418053A1 true EP1418053A1 (de) 2004-05-12
EP1418053B1 EP1418053B1 (de) 2007-10-03

Family

ID=32109144

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20030078432 Expired - Lifetime EP1418053B1 (de) 2002-11-06 2003-11-03 Verfahren zum Verbessern der Bildrandqualität

Country Status (1)

Country Link
EP (1) EP1418053B1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1952993A1 (de) 2007-01-30 2008-08-06 Hewlett-Packard Development Company, L.P. Druckverfahren und Drucksystem

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0513989A2 (de) * 1991-04-17 1992-11-19 Hewlett-Packard Company Methode zur schnellen Punktvervielfachung für einen Rasterbilderzeuger und sich ergebende Datenstruktur für das Punktbild
EP0953444A2 (de) * 1998-04-27 1999-11-03 Canon Kabushiki Kaisha Verfahren und Vorrichtung zur Bildverarbeitung und Aufzeichnungsmedium
US5992968A (en) * 1994-06-15 1999-11-30 Canon Kabushiki Kaisha Ink jet printing method and apparatus
EP1077134A1 (de) * 1999-03-05 2001-02-21 Seiko Epson Corporation Drucker mit einer vielzahl von arten von punkten mit verschiedenen formungsarten mit gleicher tintenmenge
EP1201432A1 (de) * 2000-10-31 2002-05-02 Hewlett-Packard Company, A Delaware Corporation Verfahren und Vorrichtung zur Verbesserung der Druckqualität
EP1221380A1 (de) * 2000-07-26 2002-07-10 Seiko Epson Corporation Bestimmung des einstellwertes zur aufzeichnung der änderung der drucklage mittels mehreren arten von inspektionsmustern

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0513989A2 (de) * 1991-04-17 1992-11-19 Hewlett-Packard Company Methode zur schnellen Punktvervielfachung für einen Rasterbilderzeuger und sich ergebende Datenstruktur für das Punktbild
US5992968A (en) * 1994-06-15 1999-11-30 Canon Kabushiki Kaisha Ink jet printing method and apparatus
EP0953444A2 (de) * 1998-04-27 1999-11-03 Canon Kabushiki Kaisha Verfahren und Vorrichtung zur Bildverarbeitung und Aufzeichnungsmedium
EP1077134A1 (de) * 1999-03-05 2001-02-21 Seiko Epson Corporation Drucker mit einer vielzahl von arten von punkten mit verschiedenen formungsarten mit gleicher tintenmenge
EP1221380A1 (de) * 2000-07-26 2002-07-10 Seiko Epson Corporation Bestimmung des einstellwertes zur aufzeichnung der änderung der drucklage mittels mehreren arten von inspektionsmustern
EP1201432A1 (de) * 2000-10-31 2002-05-02 Hewlett-Packard Company, A Delaware Corporation Verfahren und Vorrichtung zur Verbesserung der Druckqualität

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1952993A1 (de) 2007-01-30 2008-08-06 Hewlett-Packard Development Company, L.P. Druckverfahren und Drucksystem
US8100494B2 (en) 2007-01-30 2012-01-24 Hewlett-Packard Development Company, L.P. Method of printing and printing system

Also Published As

Publication number Publication date
EP1418053B1 (de) 2007-10-03

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