WO1999048037A1 - Techniques de mise en oeuvre d'une tete d'impression - Google Patents
Techniques de mise en oeuvre d'une tete d'impression Download PDFInfo
- 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
Links
Classifications
-
- G—PHYSICS
- G06—COMPUTING OR CALCULATING; COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K1/00—Methods or arrangements for marking the record carrier in digital fashion
- G06K1/12—Methods or arrangements for marking the record carrier in digital fashion otherwise than by punching
- G06K1/121—Methods 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
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)
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)
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 |
-
1998
- 1998-03-18 GB GBGB9805652.6A patent/GB9805652D0/en not_active Ceased
-
1999
- 1999-03-18 AU AU29476/99A patent/AU2947699A/en not_active Abandoned
- 1999-03-18 WO PCT/GB1999/000854 patent/WO1999048037A1/fr active Application Filing
Patent Citations (5)
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)
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)
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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