EP0326804A2 - Tête d'écriture à actionneurs piézo-électriques pour imprimantes matricielles à jet d'encre - Google Patents

Tête d'écriture à actionneurs piézo-électriques pour imprimantes matricielles à jet d'encre Download PDF

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Publication number
EP0326804A2
EP0326804A2 EP89100187A EP89100187A EP0326804A2 EP 0326804 A2 EP0326804 A2 EP 0326804A2 EP 89100187 A EP89100187 A EP 89100187A EP 89100187 A EP89100187 A EP 89100187A EP 0326804 A2 EP0326804 A2 EP 0326804A2
Authority
EP
European Patent Office
Prior art keywords
ink
channels
pressure
outlet openings
opening
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.)
Withdrawn
Application number
EP89100187A
Other languages
German (de)
English (en)
Other versions
EP0326804A3 (fr
Inventor
Fred Dipl.-Ing. Johannsen
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.)
AEG Olympia Office GmbH
Original Assignee
AEG Olympia AG
AEG Olympia Office GmbH
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 AEG Olympia AG, AEG Olympia Office GmbH filed Critical AEG Olympia AG
Publication of EP0326804A2 publication Critical patent/EP0326804A2/fr
Publication of EP0326804A3 publication Critical patent/EP0326804A3/fr
Withdrawn legal-status Critical Current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
    • B41J2/14201—Structure of print heads with piezoelectric elements
    • B41J2/14233—Structure of print heads with piezoelectric elements of film type, deformed by bending and disposed on a diaphragm
    • 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
    • B41J2002/14387—Front shooter

Definitions

  • the invention relates to a piezoelectrically operated write head for ink mosaic writing devices of the type specified in the preamble of claim 1.
  • the nozzle head of a droplet recorder generally has a pressure chamber connected to a liquid container, a nozzle which emits individual droplets and is connected to the pressure chamber, as well as an electromechanical transducer, for example a piezoelectric plate.
  • Part of the pressure chamber has a flexible area or a so-called membrane.
  • a device for a spray head of an ink droplet printer in which a wall of the fluid chamber is formed by a cover plate with which a plate made of piezoceramic is connected.
  • the piezoceramic is excited by means of electrical signals via electrodes and caused to vibrate, which are transmitted to the cover plate of the fluid chamber, which ultimately leads to the ejection of liquid droplets.
  • a large number of pressure chambers and electromechanical transducers must be provided in order to produce fine-screened characters in fine writing quality with the ink droplet writing heads.
  • Such a writing head is known from DE-0S 34 12 531, in which several plates with ink channels are provided. These plates are connected airtight and have staggered outlet nozzles.
  • DE-OS 31 08 885 also discloses a plurality of ink channels arranged in a radial manner.
  • a disadvantage of these known arrangements is that the ink channels are of different lengths and therefore no in-phase leakage of ink droplets out of the way ensure access openings. This also means that it is not possible to create exactly vertical lines or clean typefaces.
  • an ink writing head is known from DE-A1 36 08 205, in which the pressure channels are all of the same length.
  • the suction channels have an unequal length, so that an in-phase exit is not always guaranteed.
  • the object of the invention is to provide a piezoelectrically operated write head for ink mosaic devices which has a multiplicity of ink channels in a compact arrangement and thereby ensures that uniformly uniform droplets of ink emerge from the outlet openings.
  • This object is achieved by the invention characterized in claim 1.
  • the write head for ink mosaic writing devices has a simple structure with the same length of the ink channels from the beginning of the pressure channels to the outlet openings and the suction channels between the pressure chambers and the damping members. This ensures that the pressure pulses generated in the pressure chambers simultaneously reach the nozzle outlet openings. This measure enables a graphics-capable fine grid to be achieved with a compact construction of the writing system.
  • FIG. 1 shows a section through a writing head 1 for ink mosaic writing devices with a plurality of ink channels 3 running in a straight line from outlet openings 2, in which the writing fluid contained in compression chambers 4 is ejected drop-shaped from the outlet openings 2 by piezoelectric deformation of a drive element.
  • the write head 1 consists of a base plate 5, a membrane plate 11 and an integrated piezo crystal plate 13.
  • the base plate 5 and the membrane plate 11 are made of glass, the ink channels 3, the pressure chambers 4 and the damping members 7 are etched deep into the base plate 5.
  • the membrane plate 11 serves as a cover for the channels 3, the pressure chambers 4, etc., and at the same time as a pump membrane, which is moved by piezo crystals 10.
  • the ink channels 3 are in fluid communication with an ink storage chamber 9 via attenuators 7 designed as diodes on the suction side of the compression chambers 4, the ink channels 3 from the ink storage chamber 9 all the way up to the outlet nozzles 2.
  • the attenuators 7 simultaneously prevent air from entering the ink channels.
  • FIG. 2 shows a piezoelectrically operated drive element which has the square-shaped piezo crystal 10.
  • This piezo crystal 10 is fixed on the elastic membrane plate 11 by means of an adhesive 12.
  • the piezo crystal 10 is also fastened to a flexible printed circuit board 13 by means of an adhesive 14, the printed circuit board 13 in turn being connected to a contact plate 15.
  • the drive elements 4, 10, 11 are alternately staggered on two circles aligned concentrically with the outlet openings 2 in the longitudinal direction of the ink channels 3, thereby ensuring a compact arrangement of the pressure chambers 4 in the write head 1.
  • the sections 17 of the ink channels 3 which open into the compression chambers 4 on the inner circle are designed in such a way that the ink channels 3 all have the same channel length from the outlet openings to the drive elements 4, 10, 11.
  • the sections 18 of the ink channels 3, which open into the compression chambers 4 of the pressure chambers arranged on the outer circle, are designed in a straight line.
  • the ink channels 3 serving as suction channels between the drive elements 4, 10 and the damping members 7 are all of the same length.
  • the ink channels 3 also have alternating straight sections 21 or curved sections 22 on the suction side.
  • the straight sections 21 are in fluid communication with the pressure chambers 4 arranged on the inner circle, while the curved sections 22 open into the outer chambers 4.
  • flow deflection elements 23, 24 are arranged at the transition points of the ink channels 3 into the pressure chambers 4, through which the ink flow into the ink channels 3, in particular in the tortuous sections 17, 22, can be conducted in such a way that no air bubbles form and get caught in these sections can.
  • the flow deflecting elements 23, 24 have a diamond-shaped cross section, the free ends of which are firmly connected to the membrane plate 11.
  • the pressure channels 17, 18 opening into the pressure chambers 4 also have a diameter several times larger than the diameters of the suction channels 21, 22 opening into the pressure chambers 4. This ensures that the flow of ink to the outlet nozzles 2 is facilitated and to the attenuators 7 more difficult.
  • the ink supply chamber 9 has at its ends ascending channels 25, 26 which end immediately above and below the outlet nozzles 2 of the ink channels 3 arranged in a row in an end face 27 of the print head 1 with outlet openings 28, 29. As a result, air contained in the ink supply chamber 9 can safely escape to the outside.
  • the base plate 5 and the membrane plate 11 are connected to one another by an adhesive connection. Since any air entrapment between these plates 5, 11, in particular in the adhesive surfaces, must be avoided, the base plate 5 has in its support surfaces 30, 31, 32, 33 for the membrane plate 11 arranged outside the ink channels 3, the pressure chambers 5 and the ink supply chamber 9 channel-shaped depressions 34, 35, 36, 37, which are connected to ventilation channels 38, 39, 40, 41. In this way, a secure adhesive connection between the plates 5, 11 is achieved.
  • the membrane plate 5 has an opening 42 to the ink supply chamber 9, which is surrounded by a cylindrical sealing element 43.
  • This sealing element is firmly connected to the membrane plate 11 and has a damping membrane 44 above the opening 42. This reliably dampens any pressure surges that may occur in the ink supply channels.
  • Below the damping membrane 44 there is an ink inlet opening 44 for a connecting hose 46 to an ink tank (not shown).
  • the ink introduced through the ink inlet opening 45 is then filtered via a filter membrane 47 in such a way that any air bubbles or dirt particles that are carried along cannot get into the ink storage chamber 9 in the write head 1.
  • the damping membrane 44 is formed in two layers, by the way, while the filter membrane 47 consists of a nylon filter fabric.

Landscapes

  • Particle Formation And Scattering Control In Inkjet Printers (AREA)
EP89100187A 1988-02-05 1989-01-07 Tête d'écriture à actionneurs piézo-électriques pour imprimantes matricielles à jet d'encre Withdrawn EP0326804A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19883803432 DE3803432A1 (de) 1988-02-05 1988-02-05 Piezoelektrisch betriebener schreibkopf in tintenmosaikschreibeinrichtungen
DE3803432 1988-02-05

Publications (2)

Publication Number Publication Date
EP0326804A2 true EP0326804A2 (fr) 1989-08-09
EP0326804A3 EP0326804A3 (fr) 1990-01-31

Family

ID=6346685

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89100187A Withdrawn EP0326804A3 (fr) 1988-02-05 1989-01-07 Tête d'écriture à actionneurs piézo-électriques pour imprimantes matricielles à jet d'encre

Country Status (2)

Country Link
EP (1) EP0326804A3 (fr)
DE (1) DE3803432A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5592203A (en) * 1992-07-31 1997-01-07 Francotyp-Postalia Gmbh Ink jet print head
US5714078A (en) * 1992-07-31 1998-02-03 Francotyp Postalia Gmbh Edge-shooter ink jet print head and method for its manufacture
WO2008029650A1 (fr) * 2006-09-08 2008-03-13 Canon Kabushiki Kaisha Tête d'éjection de liquide et son procédé de fabrication

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4403042A1 (de) * 1992-07-31 1995-08-03 Francotyp Postalia Gmbh Edge-Shooter-Tintenstrahldruckkopf und Verfahren zu seiner Herstellung
DE4336416A1 (de) * 1993-10-19 1995-08-24 Francotyp Postalia Gmbh Face-Shooter-Tintenstrahldruckkopf und Verfahren zu seiner Herstellung
TW403833B (en) * 1998-06-15 2000-09-01 Ind Tech Res Inst Ink pathway design

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4374388A (en) * 1979-10-24 1983-02-15 Siemens Aktiengesellschaft Method and an arrangement for depicting a half-tone image
EP0103841A2 (fr) * 1982-09-16 1984-03-28 Siemens Aktiengesellschaft Tête à écrire avec éléments d'entraînement piézoélectriques pour dispositifs d'écriture à encre
DE3608205A1 (de) * 1986-03-12 1987-09-17 Olympia Ag Piezoelektrisch betriebener schreibkopf fuer tintenmosaikschreibeinrichtungen
DE3609154A1 (de) * 1986-03-19 1987-09-24 Olympia Ag Piezoelektrisch betriebener schreibkopf fuer tintenmosaikschreibeinrichtungen

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4374388A (en) * 1979-10-24 1983-02-15 Siemens Aktiengesellschaft Method and an arrangement for depicting a half-tone image
EP0103841A2 (fr) * 1982-09-16 1984-03-28 Siemens Aktiengesellschaft Tête à écrire avec éléments d'entraînement piézoélectriques pour dispositifs d'écriture à encre
DE3608205A1 (de) * 1986-03-12 1987-09-17 Olympia Ag Piezoelektrisch betriebener schreibkopf fuer tintenmosaikschreibeinrichtungen
DE3609154A1 (de) * 1986-03-19 1987-09-24 Olympia Ag Piezoelektrisch betriebener schreibkopf fuer tintenmosaikschreibeinrichtungen

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5592203A (en) * 1992-07-31 1997-01-07 Francotyp-Postalia Gmbh Ink jet print head
US5714078A (en) * 1992-07-31 1998-02-03 Francotyp Postalia Gmbh Edge-shooter ink jet print head and method for its manufacture
US5802687A (en) * 1992-07-31 1998-09-08 Francotyp-Postalia Ag & Co. Method of manufacturing an ink jet print head
US5825382A (en) * 1992-07-31 1998-10-20 Francotyp-Postalia Ag & Co. Edge-shooter ink jet print head and method for its manufacture
WO2008029650A1 (fr) * 2006-09-08 2008-03-13 Canon Kabushiki Kaisha Tête d'éjection de liquide et son procédé de fabrication
US8376525B2 (en) 2006-09-08 2013-02-19 Canon Kabushiki Kaisha Liquid discharge head and method of manufacturing the same
US8622523B2 (en) 2006-09-08 2014-01-07 Canon Kabushiki Kaisha Liquid discharge head and method of manufacturing the same

Also Published As

Publication number Publication date
DE3803432A1 (de) 1989-08-17
EP0326804A3 (fr) 1990-01-31

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