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WO1999048037A1 - Techniques de mise en oeuvre d'une tete d'impression - Google Patents

Techniques de mise en oeuvre d'une tete d'impression Download PDF

Info

Publication number
WO1999048037A1
WO1999048037A1 PCT/GB1999/000854 GB9900854W WO9948037A1 WO 1999048037 A1 WO1999048037 A1 WO 1999048037A1 GB 9900854 W GB9900854 W GB 9900854W WO 9948037 A1 WO9948037 A1 WO 9948037A1
Authority
WO
WIPO (PCT)
Prior art keywords
printhead
printed
dots
printing
width
Prior art date
Application number
PCT/GB1999/000854
Other languages
English (en)
Inventor
Howard Manning
Original Assignee
Xaar Technology Limited
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 Xaar Technology Limited filed Critical Xaar Technology Limited
Priority to AU29476/99A priority Critical patent/AU2947699A/en
Publication of WO1999048037A1 publication Critical patent/WO1999048037A1/fr

Links

Classifications

    • GPHYSICS
    • G06COMPUTING OR CALCULATING; COUNTING
    • G06KGRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K1/00Methods or arrangements for marking the record carrier in digital fashion
    • G06K1/12Methods or arrangements for marking the record carrier in digital fashion otherwise than by punching
    • G06K1/121Methods or arrangements for marking the record carrier in digital fashion otherwise than by punching by printing code marks

Definitions

  • the present invention relates to methods of operating a printhead to print a linear pattern on a substrate, the pattern comprising printed and unprinted areas of width equal to an integer multiple of a unit width.
  • a typical example of such a linear pattern is a barcode, as used to store information in a machine-readable format in many diverse applications.
  • EAN barcodes are made up of bars and spaces whose widths are one, two, three or four times a unit width (or "module").
  • this unit width is 330 ⁇ m at unity magnification with tolerances of 101//m on the widths of individual bars and spaces, 49 /m on bar and space pairs and 96 ⁇ m on whole characters.
  • magnification factor is reduced, these tolerances become disproportionately tighter (an EAN 13 barcode magnified by the factor 0.8, for example, has a tolerance of only 32 ⁇ m on bar and space pairs).
  • inkjet printing techniques suffer fewer limitations regarding substrate than do the thermal techniques mentioned above. It has also been recognised, however, that care will be required in the placement of inkjet ink droplets on the substrate if the necessary tolerances are to be met.
  • the present application describes methods for operating a printhead that allow such tolerances to be achieved.
  • the present invention comprises in a first aspect a method of operating a printhead to print a linear pattern on a substrate
  • the pattern comprising printed and unprinted areas of width in the direction of relative motion equal to an integer multiple, i, of a unit width, w; the printed areas being made up of dots of diameter, d, printable by the printhead at a frequency, f; the method comprising the step of printing ni dots to form a printed area, n- being given by the formula:
  • the invention consists in a method of operating a
  • printhead to print a linear pattern on a substrate, the printhead and substrate moving relative to one another at a velocity
  • v the pattern comprising printed and unprinted areas of width in the direction of relative motion equal to an integer multiples, i, of first and second unit widths, w., w 2 .
  • the printed areas being made up of dots of diameter, d, printable by the printhead at a frequency, f; the method comprising the steps of printing n 1 dots to form a first printed area, n., being given by the formula
  • a method according to a third aspect of the invention comprises in a method of operating a printhead to print a linear pattern on a substrate, the printhead comprising a linear array of dot printing means arranged at a pitch, p; the printhead and substrate moving relative to one another at a velocity,
  • the printed areas being made up of dots of diameter, d; the method comprising the step of printing n dots to form a printed area, n being given by the formula:
  • Figure 1 is a schematic illustration of a printhead printing a barcode in "picket fence” mode
  • Figures 2 and 3 are detail views of a linear barcode pattern printed by a single dot printing means
  • Figure 4 is a schematic illustration of a printhead printing a barcode in "ladder" mode
  • FIG 1 schematically illustrates the printing of a barcode 10 by a printhead 20 in "picket fence" mode, i.e. with the barcode bars 60 perpendicular to the direction 30 of relative motion of the printhead and substrate 40.
  • Printhead 20 comprises an array of dot printing means such as ink jet nozzles 25, shown larger than scale for purposes of clarity.
  • barcodes are most commonly printed on packages such as bottles or boxes as they move on a conveyor mechanism past a stationary inkjet printhead. In such a case, 22 inches/second would be the velocity of the packages on the conveyor.
  • n. 2,5,8 and 11 dots respectively.
  • ITF is another barcode standard that utilises two widths of bar: narrow, having a module width, w of 1016 ⁇ m at unity magnification and wide, having a module
  • a desirable ratio of dot size to separation is around 1.4.
  • One merit of the high degree of overlap of the drops in the direction of motion is that the overlap in the other direction, which is determined by the pitch of the ink droplet ejectors in the printhead - the "printhead resolution" - may not be critical.
  • Figure 4 schematically illustrates the printing of an EAN barcode 10 by a printhead 20 in "ladder" mode, i.e. with the barcode bars 60 parallel to the direction 30 of relative motion of the printhead and substrate 40.
  • a barcode at a magnification factor of unity can be printed accurately using a printhead having ink droplet ejectors spaced at a pitch of 165 ⁇ m (equivalent to 154 dpi) and a dot diameter of 210 ⁇ m.
  • n, and q- values are in both cases 2,4,6,8.
  • ink ejectors mounted in a printhead at a pitch of 110 ⁇ m (231 dpi) and printing dots of 150 ⁇ m can provide tolerable barcodes when using n. and q. values both equal to 3,6,9,12.
  • both upper and lower portions deform in shear towards the ink chamber, thereby causing the ejection of a droplet from the ink chamber via a nozzle.
  • a number of actuator walls can be arranged in parallel to as to define ink channels between adjacent walls. Ink ejection is achieved by actuation of the walls on both sides of a channel, with each actuator wall being displaceable in opposite directions so as to effect droplet ejection from the channels located on either side of that actuator.
  • Such "shared wall” operation is also known in the art and will not be discussed in further detail here.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Particle Formation And Scattering Control In Inkjet Printers (AREA)

Abstract

L'impression des codes à barres de type en palissade se fait en utilisant une imprimante à matrice de points en respectant la formule (ni - 1).mi(v/f) + d = i.w dans laquelle 'v' est la vitesse du substrat, 'w' est la largeur modulaire de l'unité de code à barres, 'i' et 'm' sont des entiers, 'd' est le diamètre du point, 'f' est la fréquence de mise en oeuvre de la tête d'impression, et 'n' est le nombre de points nécessaire pour la largeur de barre. L'impression des codes à barres en échelle se fait de façon analogue, en utilisant la formule (ni - 1). p + d = iw dans laquelle 'p' est l'espacement entre points de la tête d'impression.
PCT/GB1999/000854 1998-03-18 1999-03-18 Techniques de mise en oeuvre d'une tete d'impression WO1999048037A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU29476/99A AU2947699A (en) 1998-03-18 1999-03-18 Methods of operating a printhead

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GBGB9805652.6A GB9805652D0 (en) 1998-03-18 1998-03-18 Methods of operating a printhead
GB9805652.6 1998-03-18

Publications (1)

Publication Number Publication Date
WO1999048037A1 true WO1999048037A1 (fr) 1999-09-23

Family

ID=10828704

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1999/000854 WO1999048037A1 (fr) 1998-03-18 1999-03-18 Techniques de mise en oeuvre d'une tete d'impression

Country Status (3)

Country Link
AU (1) AU2947699A (fr)
GB (1) GB9805652D0 (fr)
WO (1) WO1999048037A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1291187A1 (fr) * 2001-09-07 2003-03-12 Hewlett-Packard Company Impression à jet d'encre de code à barres
US6726104B2 (en) * 2000-12-18 2004-04-27 Symbol Technologies, Inc. Scaling techniques for printing bar code symbols
US10410020B2 (en) 2011-12-23 2019-09-10 Knauf Gips Kg Method and system for checking the presence and/or readability of an item of product information

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2158636A5 (fr) * 1971-10-26 1973-06-15 Thomson Csf
EP0277703A1 (fr) 1987-01-10 1988-08-10 Xaar Limited Dispositif pour le dépôt de gouttelettes
US5007748A (en) * 1989-05-16 1991-04-16 International Business Machines Corp. Printer for bar code using thin and thick bar code fonts
US5183343A (en) * 1991-06-12 1993-02-02 Tohoku Ricoh Co., Ltd. Method of printing bar codes by a bar code printer

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2158636A5 (fr) * 1971-10-26 1973-06-15 Thomson Csf
EP0277703A1 (fr) 1987-01-10 1988-08-10 Xaar Limited Dispositif pour le dépôt de gouttelettes
EP0278590A1 (fr) 1987-01-10 1988-08-17 Xaar Limited Dispositif de dépôt de gouttelettes
US5007748A (en) * 1989-05-16 1991-04-16 International Business Machines Corp. Printer for bar code using thin and thick bar code fonts
US5183343A (en) * 1991-06-12 1993-02-02 Tohoku Ricoh Co., Ltd. Method of printing bar codes by a bar code printer

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
WELLMAN HOFF: "Evaluate dot-matrix printers' abilities to produce bar code", COMPUTER TECHNOLOGY REVIEW., vol. 3, no. 1, January 1983 (1983-01-01), WESTWORLD PRODUCTION CO. LOS ANGELES., US, pages 145 - 151, XP002110329, ISSN: 0278-9647 *

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6726104B2 (en) * 2000-12-18 2004-04-27 Symbol Technologies, Inc. Scaling techniques for printing bar code symbols
EP1291187A1 (fr) * 2001-09-07 2003-03-12 Hewlett-Packard Company Impression à jet d'encre de code à barres
US7311395B2 (en) 2001-09-07 2007-12-25 Hewlett-Packard Development Company, L.P. Optimized ink jet printing of barcodes
US10410020B2 (en) 2011-12-23 2019-09-10 Knauf Gips Kg Method and system for checking the presence and/or readability of an item of product information
EP2795529B1 (fr) * 2011-12-23 2021-11-24 Knauf Gips KG Procédé et système de vérification de la présence ou de la lisibilité d'une information de marchandise

Also Published As

Publication number Publication date
GB9805652D0 (en) 1998-05-13
AU2947699A (en) 1999-10-11

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