WO2001030576A1 - Printhead - Google Patents
Printhead Download PDFInfo
- Publication number
- WO2001030576A1 WO2001030576A1 PCT/GB2000/004121 GB0004121W WO0130576A1 WO 2001030576 A1 WO2001030576 A1 WO 2001030576A1 GB 0004121 W GB0004121 W GB 0004121W WO 0130576 A1 WO0130576 A1 WO 0130576A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- ejection
- channels
- lands
- liquid
- location
- 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
- B41J2/015—Ink jet characterised by the jet generation process
- B41J2/04—Ink jet characterised by the jet generation process generating single droplets or particles on demand
- B41J2/06—Ink jet characterised by the jet generation process generating single droplets or particles on demand by electric or magnetic field
-
- 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
- B41J2/015—Ink jet characterised by the jet generation process
- B41J2/04—Ink jet characterised by the jet generation process generating single droplets or particles on demand
- B41J2/06—Ink jet characterised by the jet generation process generating single droplets or particles on demand by electric or magnetic field
- B41J2002/061—Ejection by electric field of ink or of toner particles contained in ink
Definitions
- the present invention relates to apparatus for ejecting material from a liquid and, more particularly, to an apparatus in which the method employed is generally of the type described in WO-A-93-1 1866, the disclosure of which is incorporated herein by reference.
- an agglomeration or concentration of particles is achieved in the p ⁇ nthead and, from the ejection location, the agglomeration of particles is then ejected onto a substrate, e.g. for printing purposes.
- the ejection mechanism of printers of this type being at least partly electrostatic, and relying partly therefore on repulsion of the particles from the ejection location, may result in a tendency for pigment particles (say in a pigmented ink) to flow away from a cell from which ejection occurs to an adjacent cell from which ejection is not occurring, by the mechanism of electrophoresis.
- a further difficulty lies in the tendency of charged particles in the electric field to impinge on surfaces of the electrodes, as a result of electrophoresis.
- the shear forces created by flow through such channels may act to dislodge particles from the surfaces, the shear force needs to be greater than the electrophoretic force and the charged particles need to be moved away from the electric field before other particles impinge on them.
- an ejection apparatus for ejecting material from a liquid at a plurality of ejection locations, the apparatus comprising a plurality of channels through each of which liquid flows in use to or from a respective ejection location at an open end of the channel, an ejection electrode disposed at each ejection location and by means of which an electric field is created in use to cause the ejection of material from the liquid, and an electrically conductive path to each ejection electrode for supplying a voltage to the ejection electrode in use, characterised in that the channels are isolated from one another; and the electrically conductive paths are separated from the channels over substantially the whole of the length of the channels.
- the ink channels can communicate with each other over most of their length.
- the electrodes communicate with the ink over the full ink path in the channel.
- an electrophoretic force acts on the ink particles that drives them towards the electrodes. If a sufficiently high fluid flow rate could be used then the shear force would be sufficiently high to prevent particles beginning to build up on the electrode structure. However, it would not be practical to use such a high flow rate.
- the present invention provides a better solution in that by ensuring that the channels are isolated from one another, and the electrically conductive paths are separated from the channels over substantially the whole of the length of the channels, the electrophoretic force is reduced and therefore a lower shear force is required to prevent particles from building up on the electrodes. Since a lower shear force is required the velocity of the flow can be reduced.
- the present invention also achieves the object of US 5,754,199 without requiring complex drive signals that, as stated earlier, will limit the print speed.
- each channel is preferably one of a pair of co-operating channels, one of which supplies liquid to a respective ejection location and the other of which removes depleted liquid from the same ejection location, the channels of each pair thus having a common open end.
- the channels of each pair may have longitudinal axes which are disposed at an angle to one another so that liquid is brought to the ejection location and removed from it from the sides, the electrically conductive paths being provided substantially along a central axis bisecting the axes of the channels.
- the channels may be formed along the edges of a pair of prismatic bodies separate from a component which forms the ejection locations
- the individual channels are separated from one another by a plurality of walls and isolation of the individual channels is achieved by closing the tops of the channels over a majority of their length, preferably by means of a pair of side covers, each of which is common to all of the channels on a respective side and which engages the walls.
- lands separate the ejection locations from one another.
- Protrusions preferably form the ejection locations and are also defined by lands between the lands which separate individual ejection locations from one another, the protrusions of the ejection location-defining lands being smaller in width and defining, on each side thereof, passages for liquid flow between the ejection location-separating lands.
- spacers may be provided on the flanks of the ejection location-defining lands at least over most of their length, the separators being formed integrally with the protrusion-defining lands, the channel-separating lands or both.
- the lands and separators are preferably formed by a component located between the prismatic bodies in which the channels are formed.
- each channel may be of increased length in comparison with the prior designs mentioned above and by providing side covers which close the individual channels, fluid separation between them is provided.
- the separators are metallised to provide the electrically conducting paths to the ejection electrodes
- each electrically conductive path is disposed so as to be out of contact with the liquid, in use, over substantially the whole of its length.
- Each electrically conductive path may be disposed so as to be in contact with the liquid, in use, solely at the region of the corresponding ejection location.
- Figure 2 is a perspective view, again from the front, in close-up;
- Figure 3 is a longitudinal section through the p ⁇ nthead;
- Figure 4 is a perspective view of the p ⁇ nthead showing supporting bodies attached to each side and,
- Figure 5 is a further perspective view showing side covers attached to each of the supporting bodies.
- Figures 1 and 2 illustrate the construction of the individual cells 2 of a p ⁇ nthead 1 , individual cells 2 being separated by separating lands 3 and each cell including an ejection location defined by a protrusion 4 formed at the end of a corresponding land 5 disposed substantially centrally between the cell-defining or ejection location/cell- separating lands 3 on each side.
- Ejection electrodes 7 are formed by selective metallisation of surfaces of the cell- separating and protrusion-forming lands 3,5. Each of the protrusion-supporting lands
- each spacer 6 is separated from the adjacent cell-separating lands by a spacer 6 (only one of which can be seen in each cell 2 in Figures 1 and 2, because of the perspective), the surface of each spacer likewise being metallised to provide an electrically conductive path or track 12 to the respective ejection electrodes 7 from the rear of the p ⁇ nthead (best seen in Figure 3).
- each cell the lands 5 are tapered at an acute angle and support the ejection location protrusion 4 at their front edge, the cell-separating lands 3 being tapered at a larger angle as shown.
- liquid supply and removal channels 11 which respectively supply and remove liquid from the cells 2 and which in part define the cells
- FIG. 2 illustrates side covers 10 which close the channels 1 1 formed between the walls 8.
- the precise shape of the protrusions 4, defining the ejection locations, will depend upon the application, the intended liquid with which the pnnthead is to be used, its operating conditions etc.
- the protrusions 4 are simple triangular forms or upstands formed on the front edge of the lands 5, but of lesser thickness.
- the lands 3, 5, upstands 4, spacers 6, wings 8 and side covers 10 are formed from a ceramic material.
- the ink flow rate is typically 0.01 ms 1 in the centre of the channels.
- ejection voltage pulses being of the order of 1000V
- a typical electrophoretic electric field of 5 x 10 4 Vm 1 will be generated in the ink between the ejection electrodes.
- a typical value of the electrophoretic force on the particles will be 10 13 N and the resulting electrophoretic velocities will be around 10 5 ms 1 .
- the flow of ink through the channels will generate a shear force on the particles of 5 x 10 13 N.
- any particle pushed onto the walls of a channel will be swept along the channel by the flow. This results in particles closest to the channel wall passing the first 20 ⁇ m of each electrode in about 0.1s.
- the significance of this is that, due to electrostatic screening, it is within the first 20 ⁇ m that particle deposition on the electrode tends otherwise to occur as a result of particles being pushed onto the electrode in that region at a rate of about one layer every 2s.
- the fact that the particles closest to the channel wall are swept past the first 20 ⁇ m of electrode before another layer of particles is laid down eliminates such particle deposition.
Landscapes
- Particle Formation And Scattering Control In Inkjet Printers (AREA)
Abstract
Description
Claims
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE60003212T DE60003212T2 (en) | 1999-10-25 | 2000-10-25 | HEAD |
JP2001532961A JP4780886B2 (en) | 1999-10-25 | 2000-10-25 | Print head |
EP00969710A EP1224079B1 (en) | 1999-10-25 | 2000-10-25 | Printhead |
US10/110,530 US6905188B1 (en) | 1999-10-25 | 2000-10-25 | Ejection apparatus for printhead |
AU79366/00A AU762103B2 (en) | 1999-10-25 | 2000-10-25 | Printhead |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP99308383A EP1095772A1 (en) | 1999-10-25 | 1999-10-25 | Printhead |
EP99308383.1 | 1999-10-25 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2001030576A1 true WO2001030576A1 (en) | 2001-05-03 |
Family
ID=8241694
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/GB2000/004121 WO2001030576A1 (en) | 1999-10-25 | 2000-10-25 | Printhead |
Country Status (8)
Country | Link |
---|---|
US (1) | US6905188B1 (en) |
EP (2) | EP1095772A1 (en) |
JP (1) | JP4780886B2 (en) |
KR (1) | KR100753197B1 (en) |
CN (1) | CN1155473C (en) |
AU (1) | AU762103B2 (en) |
DE (1) | DE60003212T2 (en) |
WO (1) | WO2001030576A1 (en) |
Cited By (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2002057085A1 (en) | 2001-01-18 | 2002-07-25 | Tonejet Limited | Electrodes for a drop-on-demand printer |
WO2011032939A1 (en) | 2009-09-15 | 2011-03-24 | Tonejet Limited | Printing process and liquid ink jet ink |
EP2394818A1 (en) | 2010-06-11 | 2011-12-14 | Tonejet Limited | Printhead control |
EP2666636A1 (en) | 2012-05-23 | 2013-11-27 | Tonejet Limited | Printhead control |
EP2708363A1 (en) | 2012-09-17 | 2014-03-19 | Tonejet Limited | Printhead calibration and printing |
EP2801480A1 (en) | 2013-09-25 | 2014-11-12 | Tonejet Limited | Printhead cleaning cap |
EP2805826A1 (en) | 2013-05-20 | 2014-11-26 | Tonejet Limited | Printhead calibration and printing |
EP2853400A1 (en) | 2013-09-25 | 2015-04-01 | Tonejet Limited | Method of cleaning electrostatic printhead |
EP2875953A1 (en) | 2013-11-20 | 2015-05-27 | Tonejet Limited | Printhead control |
WO2017037224A1 (en) | 2015-09-02 | 2017-03-09 | Tonejet Limited | Method of operating an inkjet printhead |
WO2017064310A1 (en) | 2015-10-16 | 2017-04-20 | Tonejet Limited | Ultrasonic maintenance cap |
US10011121B2 (en) | 2014-04-28 | 2018-07-03 | Tonejet Limited | Printing on cylindrical objects |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8579414B2 (en) * | 2009-12-23 | 2013-11-12 | Xerox Corporation | Self-assembling structures for electrostatic extraction of pigments from liquid inks for marking |
GB201211573D0 (en) | 2012-06-29 | 2012-08-15 | The Technology Partnership Plc | Liquid management system |
GB2521126A (en) | 2013-12-05 | 2015-06-17 | Tonejet Ltd | Apparatus for controlling ink pressure |
CN113727856A (en) | 2019-04-26 | 2021-11-30 | 唐杰有限公司 | Device and method for preparing a cylindrical object for decoration thereon |
Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1993011866A1 (en) | 1991-12-18 | 1993-06-24 | Research Laboratories Of Australia Pty. Ltd. | Method and apparatus for the production of discrete agglomerations of particulate matter |
EP0760290A2 (en) * | 1995-08-30 | 1997-03-05 | Nec Corporation | Electrostatic ink jet recording head |
WO1997027058A1 (en) | 1996-01-22 | 1997-07-31 | Tonejet Corporation Pty. Ltd. | Electrode for printer |
WO1997027057A1 (en) | 1996-01-22 | 1997-07-31 | Tonejet Corporation Pty. Ltd. | Method and apparatus for ejection of particulate material |
WO1997027056A1 (en) | 1996-01-22 | 1997-07-31 | Tonejet Corporation Pty. Ltd. | Ejection apparatus and method |
EP0822075A2 (en) * | 1996-07-31 | 1998-02-04 | Nec Corporation | Electrostatic ink jet recording head |
US5754199A (en) | 1995-03-23 | 1998-05-19 | Kabushiki Kaisha Toshiba | Image forming apparatus and image forming method |
WO1998032609A1 (en) | 1997-01-22 | 1998-07-30 | Tonejet Corporation Pty. Ltd. | Ejection apparatus |
Family Cites Families (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP3047661B2 (en) * | 1993-02-16 | 2000-05-29 | ブラザー工業株式会社 | Droplet ejector |
JP3163878B2 (en) * | 1993-11-11 | 2001-05-08 | ブラザー工業株式会社 | Ink jet device |
US5646661A (en) * | 1993-11-11 | 1997-07-08 | Brother Kogyo Kabushiki Kaisha | Ink ejecting device having alternating ejecting channels and non-ejecting channels |
DE69600211T2 (en) * | 1995-06-29 | 1998-12-03 | Nec Corp | Electrostatic ink jet print head with an electrode stack structure |
CN1121947C (en) * | 1996-06-07 | 2003-09-24 | 佳能株式会社 | Liquid ejection head and apparatus, and manufacturing method for liquid ejection head |
EP0827831B1 (en) * | 1996-08-28 | 2002-11-06 | NEC Corporation | Electrostatic ink-jet recording apparatus using ink containing charge particulate material |
DE69814486T2 (en) * | 1997-01-14 | 2004-04-01 | Nec Corp. | Ink jet recording head with a piezoelectric substrate |
GB9706069D0 (en) * | 1997-03-24 | 1997-05-14 | Tonejet Corp Pty Ltd | Application of differential voltage to a printhead |
JP2859242B2 (en) * | 1997-04-04 | 1999-02-17 | 新潟日本電気株式会社 | Electrostatic ink jet recording head |
JP3048957B2 (en) * | 1997-05-26 | 2000-06-05 | 新潟日本電気株式会社 | Electrostatic inkjet printhead |
-
1999
- 1999-10-25 EP EP99308383A patent/EP1095772A1/en not_active Withdrawn
-
2000
- 2000-10-25 WO PCT/GB2000/004121 patent/WO2001030576A1/en active IP Right Grant
- 2000-10-25 AU AU79366/00A patent/AU762103B2/en not_active Ceased
- 2000-10-25 EP EP00969710A patent/EP1224079B1/en not_active Expired - Lifetime
- 2000-10-25 JP JP2001532961A patent/JP4780886B2/en not_active Expired - Fee Related
- 2000-10-25 US US10/110,530 patent/US6905188B1/en not_active Expired - Lifetime
- 2000-10-25 DE DE60003212T patent/DE60003212T2/en not_active Expired - Lifetime
- 2000-10-25 KR KR1020027005205A patent/KR100753197B1/en active IP Right Grant
- 2000-10-25 CN CNB008148201A patent/CN1155473C/en not_active Expired - Fee Related
Patent Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1993011866A1 (en) | 1991-12-18 | 1993-06-24 | Research Laboratories Of Australia Pty. Ltd. | Method and apparatus for the production of discrete agglomerations of particulate matter |
US5754199A (en) | 1995-03-23 | 1998-05-19 | Kabushiki Kaisha Toshiba | Image forming apparatus and image forming method |
EP0760290A2 (en) * | 1995-08-30 | 1997-03-05 | Nec Corporation | Electrostatic ink jet recording head |
WO1997027058A1 (en) | 1996-01-22 | 1997-07-31 | Tonejet Corporation Pty. Ltd. | Electrode for printer |
WO1997027057A1 (en) | 1996-01-22 | 1997-07-31 | Tonejet Corporation Pty. Ltd. | Method and apparatus for ejection of particulate material |
WO1997027056A1 (en) | 1996-01-22 | 1997-07-31 | Tonejet Corporation Pty. Ltd. | Ejection apparatus and method |
EP0822075A2 (en) * | 1996-07-31 | 1998-02-04 | Nec Corporation | Electrostatic ink jet recording head |
WO1998032609A1 (en) | 1997-01-22 | 1998-07-30 | Tonejet Corporation Pty. Ltd. | Ejection apparatus |
Cited By (21)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2002057085A1 (en) | 2001-01-18 | 2002-07-25 | Tonejet Limited | Electrodes for a drop-on-demand printer |
US9156256B2 (en) | 2009-09-15 | 2015-10-13 | Tonejet Limited | Printing process and liquid ink jet ink |
WO2011032939A1 (en) | 2009-09-15 | 2011-03-24 | Tonejet Limited | Printing process and liquid ink jet ink |
EP2394818A1 (en) | 2010-06-11 | 2011-12-14 | Tonejet Limited | Printhead control |
WO2011154334A1 (en) | 2010-06-11 | 2011-12-15 | Tonejet Limited | Image and printhead control |
US8777357B2 (en) | 2010-06-11 | 2014-07-15 | Tonejet Limited | Image and printhead control |
EP2666636A1 (en) | 2012-05-23 | 2013-11-27 | Tonejet Limited | Printhead control |
EP2708363A1 (en) | 2012-09-17 | 2014-03-19 | Tonejet Limited | Printhead calibration and printing |
WO2014041181A1 (en) | 2012-09-17 | 2014-03-20 | Tonejet Limited | Printhead calibration and printing |
US9630401B2 (en) | 2013-05-20 | 2017-04-25 | Tonejet Limited | Printhead calibration and printing |
EP2805826A1 (en) | 2013-05-20 | 2014-11-26 | Tonejet Limited | Printhead calibration and printing |
EP2853400A1 (en) | 2013-09-25 | 2015-04-01 | Tonejet Limited | Method of cleaning electrostatic printhead |
EP2801480A1 (en) | 2013-09-25 | 2014-11-12 | Tonejet Limited | Printhead cleaning cap |
US9662888B2 (en) | 2013-09-25 | 2017-05-30 | Tonejet Limited | Method of cleaning electrostatic printhead |
US9707762B2 (en) | 2013-09-25 | 2017-07-18 | Tonejet Limited | Printhead cleaning cap |
WO2015075073A2 (en) | 2013-11-20 | 2015-05-28 | Tonejet Limited | Printhead control |
EP2875953A1 (en) | 2013-11-20 | 2015-05-27 | Tonejet Limited | Printhead control |
US9463639B1 (en) | 2013-11-20 | 2016-10-11 | Tonejet Limited | Printhead control |
US10011121B2 (en) | 2014-04-28 | 2018-07-03 | Tonejet Limited | Printing on cylindrical objects |
WO2017037224A1 (en) | 2015-09-02 | 2017-03-09 | Tonejet Limited | Method of operating an inkjet printhead |
WO2017064310A1 (en) | 2015-10-16 | 2017-04-20 | Tonejet Limited | Ultrasonic maintenance cap |
Also Published As
Publication number | Publication date |
---|---|
US6905188B1 (en) | 2005-06-14 |
EP1095772A1 (en) | 2001-05-02 |
EP1224079A1 (en) | 2002-07-24 |
CN1155473C (en) | 2004-06-30 |
KR20020067034A (en) | 2002-08-21 |
KR100753197B1 (en) | 2007-08-30 |
JP2003512210A (en) | 2003-04-02 |
DE60003212D1 (en) | 2003-07-10 |
AU7936600A (en) | 2001-05-08 |
EP1224079B1 (en) | 2003-06-04 |
AU762103B2 (en) | 2003-06-19 |
DE60003212T2 (en) | 2003-12-11 |
JP4780886B2 (en) | 2011-09-28 |
CN1382086A (en) | 2002-11-27 |
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