EP0054999B1 - Buse pour imprimante à jet d'encre - Google Patents

Buse pour imprimante à jet d'encre Download PDF

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Publication number
EP0054999B1
EP0054999B1 EP81201351A EP81201351A EP0054999B1 EP 0054999 B1 EP0054999 B1 EP 0054999B1 EP 81201351 A EP81201351 A EP 81201351A EP 81201351 A EP81201351 A EP 81201351A EP 0054999 B1 EP0054999 B1 EP 0054999B1
Authority
EP
European Patent Office
Prior art keywords
nozzle
ink
edge
jet nozzle
drop
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.)
Expired
Application number
EP81201351A
Other languages
German (de)
English (en)
Other versions
EP0054999A1 (fr
Inventor
Horst Bentin
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.)
Philips Intellectual Property and Standards GmbH
Koninklijke Philips NV
Original Assignee
Philips Patentverwaltung GmbH
Philips Gloeilampenfabrieken NV
Koninklijke Philips Electronics NV
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 Philips Patentverwaltung GmbH, Philips Gloeilampenfabrieken NV, Koninklijke Philips Electronics NV filed Critical Philips Patentverwaltung GmbH
Publication of EP0054999A1 publication Critical patent/EP0054999A1/fr
Application granted granted Critical
Publication of EP0054999B1 publication Critical patent/EP0054999B1/fr
Expired 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
    • B41J2/005—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
    • B41J2/135—Nozzles
    • B41J2/14—Structure thereof only for on-demand ink jet heads
    • B41J2/1433—Structure of nozzle plates
    • 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
    • B41J2/135—Nozzles
    • B41J2/14—Structure thereof only for on-demand ink jet heads
    • B41J2002/14475—Structure thereof only for on-demand ink jet heads characterised by nozzle shapes or number of orifices per chamber

Definitions

  • the invention relates to a nozzle for inkjet mosaic printers, the sharp-edged outlet opening of which is formed by a recess surrounding the nozzle edge in a nozzle carrier as an annular projection protruding from the recess.
  • a large number of such nozzles is arranged in a nozzle carrier in such a way that the pulsed ejected ink drops form a figure, e.g. B. put together a letter.
  • Such nozzles are known from Figure 2 of DE-AS 23 62 576.
  • a trench-shaped recess is arranged around the outlet opening at a close distance, through which a concentric drop of ink drop is to be achieved.
  • the edge between the nozzle edge - and the recess acts as a resistance to wetting by the ink.
  • CH-A-363 667 is concerned with another type of ink jet printer.
  • This publication describes a tubular nozzle from which an ink jet constantly emerges during a writing process. So that a good electrostatic deflection of this beam is achieved, the tubular nozzle is brought to a narrow nozzle edge by pulling out the mouth. Because of their dimensions, such tubular nozzles are not suitable for mosaic printers. The nozzle openings to be worked into a nozzle plate cannot be pulled out like a pipe or provided with a drawn tip.
  • nozzles are not suitable for inkjet printers in which a large number of nozzles are arranged at a short distance for a matrix print in a nozzle plate and operate on the principle of “droplet-on-demand”, ie their ink drops are ejected individually from the nozzle and only hit the record carrier in free flight without external interference. Since the ink drops ejected here are larger than the inside diameter of the nozzle outlet opening, it must be chosen as small as possible. In order to achieve a good matrix print, the dimensions of the nozzles are in the order of 50 to 100 1 1m in diameter, the smaller value should be aimed for as far as possible.
  • FIG. 1 shows a nozzle outlet opening and the individual phases of the drop emission.
  • the nozzle openings are arranged flat in the surface of a nozzle plate.
  • the condition of the dry nozzle is assumed (a).
  • the still negatively curved liquid meniscus is curved positively, the entire nozzle opening being filled with liquid up to a certain height of the curvature (b).
  • the diameter of the parabolic bulge is determined by the diameter of the nozzle.
  • the geometry of this wetting varies due to surface defects, contamination and chemical effects.
  • the size of the wetting ring also depends on the frequency at which the ink droplets are ejected and will be larger the more ink drops have been ejected. Then, after several expulsions, the wetting reaches an external resistance corresponding to the above. known arrangements, this finally prevents further spreading.
  • the wetting ability of the near nozzle edge area is still approximately the same because of its dry state, the first drop will most likely still be ejected in the desired axial direction to the nozzle (i.e. ). However, the wetting edge will no longer be exactly delimited in the radial direction by the nozzle edge.
  • the ink liquid is drawn back into the nozzle and another negative liquid meniscus is formed. Residual liquid remains on the nozzle edge, which is irregularly shaped depending on the nature of the nozzle edge (e).
  • the next pulse of the drop generator then leads to a deflection of the bumped ink drop (f) because the lateral forces then acting on it are different. These forces are greater the more liquid remains on a part of the nozzle edge.
  • the nozzles of the inkjet printer must ensure reproducible, stabilizing droplet formation. Exact axial ejection of the drops must therefore be achieved.
  • the invention has for its object to form the nozzle of an inkjet printer, in which the ink drops are ejected individually for a free uninfluenced flight, so that the ink drops are ejected equally and always axially in the direction of the nozzle and that an annular and radial immediately around the nozzle edge there is uniform interfacial tension, which defines and limits the lateral wetting in a ring already after the first ink drop has been ejected.
  • the front edge of the elevation has a width of 0 to 20 11 m.
  • the outlet opening of the nozzle is expediently designed such that the protruding elevation has the cross section of an acute-angled triangle, the acute corner of which forms the edge of the nozzle.
  • a rectangular cross section can also be used, the narrow side of which must then be less than 20 11 m wide.
  • the invention has the advantage that the nozzle edge is inevitably wetted uniformly by the remaining ink, even if the ink droplet that has been repelled initially results in uneven wetting. As a result of the nozzle edge, which is generally considered to be sharp-edged, the remaining ink is distributed evenly over the entire nozzle edge immediately and before the next ink drop begins to emerge. Another advantage is that the residual ink flowing into the nozzle channel after the emission is largely reduced. As a result, the output frequency can be increased significantly.
  • nozzle front plate 1 For matrix printing by inkjet printers, in which the ink drops are ejected or ejected individually, several drop generators are bundled, the pressure channels of which are closed off by a removable nozzle front plate 1.
  • the arrangement of the nozzles 2 in this front plate 1 is determined by the vertical rasterization of the character to be printed. For a certain print quality, effective nozzle spacing of around 100 ⁇ m is required.
  • the nozzles can be arranged in several rows with staggered grid spacings.
  • the diameter d of the nozzle 2 is approximately 50 ⁇ m.
  • the length of the nozzle-effective part is a multiple of the nozzle opening, e.g. B. 3 to 4 times.
  • the nozzle 2 contains an inlet cone 5 with an opening angle of approximately 20 to 45 ° in order to be able to connect it to a liquid channel of 0.3 mm in diameter.
  • a recess is provided around the outlet opening 4 of the nozzle 2, so that the outlet opening 4 lies flat with the surface of the nozzle plate.
  • the nozzle outlet opening 4 merges into a nozzle edge 3.
  • the two edges of this annular nozzle edge 3, which are formed on the one hand with the nozzle 2 and on the other hand with the recess, are formed with sharp edges.
  • the inner diameter of the nozzle edge 3 corresponds to the nozzle diameter d and the outer diameter D of the nozzle edge is only slightly larger, so that the difference D - d is extremely small. This difference should go as far as possible, however, for manufacturing reasons, differences of up to 20 "" m are permissible.
  • FIG. 2 has a rectangular cross section 10, the small side of which forms the sharp-edged nozzle edge 3.
  • FIG. 3 shows an embodiment in which the nozzle edge 3 is kept small in that the cross section of this area forms an acute-angled triangle, the tip of which represents the nozzle edge 3.
  • This nozzle shape with an acute-angled triangular cross section 10a should be sought if possible.
  • the decisive factor here is the uniform and annular blocking of the lateral wetting in the immediate vicinity of the nozzle edge.
  • FIG. 4 shows individual phases of the drop emission, as occurs in the nozzle shown in FIG. 2. Since the nozzle edge is dry before the first drop emerges, phases a to d initially do not differ from phases a to d shown in FIG. However, in phase d there is already an exact wetting of the nozzle edge. After the ink drop is repelled, the ink liquid is drawn back into the nozzle by the natural vibrations of the liquid column. This process is shown in phases e and f. After completion of this reflux and before the start of the ejection of a second drop, an exactly defined wetting is left on the nozzle edge 3, which is no longer connected to the liquid in the nozzle due to the sharp edge of the outlet opening. This point in time is shown in g.
  • the ink in the nozzle channel finds an equal residual wetting on all sides at the nozzle edge. Since the nozzle edge is uniform and sharp-edged, the lateral forces emanating from the remaining wetting will be very small and the strength will be the same on all sides. Characterized an axial outline of the drop is ensured in the direction of the nozzle, as shown in i '. With such a nozzle shape, it is then insignificant whether the tearing off of the ink drop according to k is not ended centrally but in some edge region of the nozzle edge.
  • FIG. 5 shows, it is also insignificant in the case of the sharp-edged formation of the nozzle edge 3 whether the wetting of the nozzle edge 3 is uneven immediately after the ink drop has been torn off. This is exaggerated in FIG. 5 in that it is assumed here that the residual ink 9 remaining on the nozzle edge 3 is drop-shaped. Since both the inner edge and the outer edge of the nozzle edge 3 are sharp-edged and both edges practically coincide, the ink drop 9 will inevitably be distributed uniformly over the entire nozzle edge 3 without going beyond its edges. This state is shown in b.
  • FIG. 6 shows a partial section of a nozzle plate 1 with two nozzles 2 according to FIG. 2. Between the nozzles 2 there are recesses 6, in the middle of which a drain 7 is arranged for the backflow of the ink.
  • the projecting annular and sharp-edged nozzle edge 3 achieves a separation of excess ink, which can be discharged through the drainage channels 7, from the ink in the nozzles 2.
  • This can be used to clean the nozzles.
  • the nozzles are flooded, for example by pressure on the ink supply chamber. This flooding is shown in FIG. 6 a by the arrows and by the arc-shaped overvoltage over the nozzles 2.
  • the subsequent static vacuum in the nozzles 2 cleans itself in the region of the nozzle edges 3. As already stated, this is achieved by the inevitable separation of the excess ink in the recesses 6 from the ink in the nozzles 2.
  • the excess ink in the recesses 6 flow through the channels 7. This state is shown in Figure 6b.
  • the concentric recesses 6 around the nozzles 2 also prevent soiling of the large critical surface of the nozzle front plate by paper dust and dye residues.
  • the recesses 6 are designed so that the height of the annular nozzle edge 3 and the plane of the nozzle plate 1 lying outside the recess 6 are the same.
  • An essential technical property of this arrangement is the reduction of post-flow processes after the emission of a single drop, whereby a significant increase in the drop rate is possible.
  • the post-flow processes for the final resting of the meniscus are set in a defined manner, so that inks with a higher viscosity can also be used for controlled drop formation.

Landscapes

  • Particle Formation And Scattering Control In Inkjet Printers (AREA)

Claims (4)

1. Buse pour une imprimante par jet d'encre, dont l'ouverture de sortie à côtés aigus présente, par l'existence d'un évidement entourant le bord de buse et ménagé dans un support de buses, la forme d'une surélévation annulaire en saillie par rapport audit évidement, caractérisée en ce que la largeur de la face frontale de la surélévation est comprise entre zéro et vingt µm.
2. Buse selon la revendication 1, caractérisée en ce que la section transversale de la surélévation en saillie constitue un triangle aigu dont l'angle aigu forme le bord de buse.
3. Buse selon les revendications 1 et 2, caractérisée en ce que le bord de la surélévation est formé par un matériau se laissant facilement humecter, alors que les autres parties du support de buses sont formées par un matériau se laissant humecter difficilement.
4. Buse selon les revendications 1, 2 et 3, caractérisée en ce que le diamètre de l'ouverture de buse est égal à environ 50 µm.
EP81201351A 1980-12-20 1981-12-11 Buse pour imprimante à jet d'encre Expired EP0054999B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19803048259 DE3048259A1 (de) 1980-12-20 1980-12-20 "duese fuer tintenstrahldrucker"
DE3048259 1980-12-20

Publications (2)

Publication Number Publication Date
EP0054999A1 EP0054999A1 (fr) 1982-06-30
EP0054999B1 true EP0054999B1 (fr) 1985-09-18

Family

ID=6119797

Family Applications (1)

Application Number Title Priority Date Filing Date
EP81201351A Expired EP0054999B1 (fr) 1980-12-20 1981-12-11 Buse pour imprimante à jet d'encre

Country Status (6)

Country Link
US (1) US4413268A (fr)
EP (1) EP0054999B1 (fr)
JP (1) JPS57131569A (fr)
AT (1) AT376613B (fr)
CA (1) CA1176503A (fr)
DE (2) DE3048259A1 (fr)

Families Citing this family (29)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4549188A (en) * 1984-01-09 1985-10-22 The Mead Corporation Orifice plate for ink jet printer
US4728392A (en) * 1984-04-20 1988-03-01 Matsushita Electric Industrial Co., Ltd. Ink jet printer and method for fabricating a nozzle member
DE3586998T2 (de) * 1984-09-28 1993-07-22 Matsushita Electric Ind Co Ltd Tintenstrahldrucker.
US4613875A (en) * 1985-04-08 1986-09-23 Tektronix, Inc. Air assisted ink jet head with projecting internal ink drop-forming orifice outlet
JP2841750B2 (ja) * 1989-07-03 1998-12-24 セイコーエプソン株式会社 オンデマンド型インクジェット印字ヘッド
US5355158A (en) * 1990-01-11 1994-10-11 Canon Kabushiki Kaisha Ink jet apparatus and method of recovering ink jet head
GB9202434D0 (en) * 1992-02-05 1992-03-18 Xaar Ltd Method of and apparatus for forming nozzles
US5487483A (en) * 1994-05-24 1996-01-30 Xerox Corporation Nozzles for ink jet devices and method for microfabrication of the nozzles
AUPN623895A0 (en) * 1995-10-30 1995-11-23 Eastman Kodak Company A manufacturing process for lift print heads with nozzle rim heaters
US5901425A (en) * 1996-08-27 1999-05-11 Topaz Technologies Inc. Inkjet print head apparatus
US6557977B1 (en) 1997-07-15 2003-05-06 Silverbrook Research Pty Ltd Shape memory alloy ink jet printing mechanism
US7628468B2 (en) 1997-07-15 2009-12-08 Silverbrook Research Pty Ltd Nozzle with reciprocating plunger
US6132028A (en) * 1998-05-14 2000-10-17 Hewlett-Packard Company Contoured orifice plate of thermal ink jet print head
US6507001B1 (en) * 1999-01-19 2003-01-14 Xerox Corporation Nozzles for ink jet devices and laser ablating or precision injection molding methods for microfabrication of the nozzles
JP2001113698A (ja) * 1999-10-19 2001-04-24 Nec Niigata Ltd ノズルプレート及びその製造方法及びインクジェット記録ヘッド
US6341732B1 (en) 2000-06-19 2002-01-29 S. C. Johnson & Son, Inc. Method and apparatus for maintaining control of liquid flow in a vibratory atomizing device
AU2002228864A1 (en) * 2000-11-10 2002-05-21 Therics, Inc. A wetting-resistant nozzle for dispensing small volumes of liquid and a method for manufacturing a wetting-resistant nozzle
US7077334B2 (en) * 2003-04-10 2006-07-18 Massachusetts Institute Of Technology Positive pressure drop-on-demand printing
EP1468748A1 (fr) * 2003-04-15 2004-10-20 Microflow Engineering SA Générateur de gouttelettes de liquide et sa buse
EP1684980B1 (fr) * 2003-11-04 2011-10-26 Chimei Innolux Corporation Perfectionnements apportes a la precision du positionnement des gouttelettes dans l'impression a jet d'encre
ATE538933T1 (de) * 2003-12-30 2012-01-15 Dimatix Inc Tropfenausstossanordnung
EP1706271B1 (fr) * 2003-12-30 2011-12-21 Dimatix, Inc. Ensemble d'ejection de gouttelettes
US7168788B2 (en) * 2003-12-30 2007-01-30 Dimatix, Inc. Drop ejection assembly
US7303259B2 (en) * 2003-12-30 2007-12-04 Fujifilm Dimatix, Inc. Drop ejection assembly
US7052122B2 (en) * 2004-02-19 2006-05-30 Dimatix, Inc. Printhead
JP4632441B2 (ja) * 2005-09-05 2011-02-16 キヤノン株式会社 インクジェット記録ヘッドおよびインクジェット記録装置
US7445317B2 (en) * 2005-10-11 2008-11-04 Silverbrook Research Pty Ltd Inkjet printhead with droplet stem anchor
US8348177B2 (en) * 2008-06-17 2013-01-08 Davicon Corporation Liquid dispensing apparatus using a passive liquid metering method
US9856794B2 (en) * 2012-10-23 2018-01-02 Hamilton Sundstrand Corporation High pressure relief valve nozzle

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CH363667A (fr) * 1960-01-11 1962-08-15 Paillard Sa Ajutage à paroi mince, notamment pour dispositif d'écriture au moyen d'un jet d'encre
CH425838A (fr) * 1965-09-29 1966-12-15 Paillard Sa Aiguille tubulaire pour l'écriture au moyen d'un jet d'encre
DE2164406A1 (de) * 1971-01-06 1972-07-20 Paillard Sa Einrichtung zum Zuführen von Schreibflüssigkeit zur Spitze des Ausstoßrohres von Flüssigkeitsstrahlschreibern
US3774231A (en) * 1972-05-15 1973-11-20 A Tullos Jewel tip capillary pen
US3843003A (en) * 1972-07-07 1974-10-22 Clark Equipment Co Extended reach mechanism for a truck
JPS4938679A (fr) * 1972-08-11 1974-04-10
DE2358168C2 (de) * 1972-11-24 1982-06-03 Research and Development Laboratories of Ohno Co.Ltd., Yokohama, Kanagawa Registiereinheit
US3958249A (en) * 1974-12-18 1976-05-18 International Business Machines Corporation Ink jet drop generator
JPS6027572B2 (ja) * 1977-09-29 1985-06-29 富士ゼロックス株式会社 インク液滴噴射装置
IT1116334B (it) * 1977-12-28 1986-02-10 Olivetti & Co Spa Dispositivo di scrittura senza impatto ad emissione selettiva di particelle solide di inchiostro
JPS5516833A (en) * 1978-07-18 1980-02-05 Mitsubishi Electric Corp Elevator shaft indicator
DE2846844A1 (de) * 1978-10-27 1980-05-08 Philips Patentverwaltung Tintenstrahldrucker
US4282533A (en) * 1980-02-22 1981-08-04 Celanese Corporation Precision orifice nozzle devices for ink jet printing apparati and the process for their manufacture
US4349830A (en) * 1980-11-12 1982-09-14 Burroughs Corporation Conical nozzle for an electrostatic ink jet printer

Also Published As

Publication number Publication date
AT376613B (de) 1984-12-10
ATA546681A (de) 1984-05-15
JPS57131569A (en) 1982-08-14
EP0054999A1 (fr) 1982-06-30
DE3172384D1 (en) 1985-10-24
CA1176503A (fr) 1984-10-23
DE3048259A1 (de) 1982-07-29
US4413268A (en) 1983-11-01

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