EP0716926A2 - Auf Abruf arbeitender Tintenstrahldruckkopf mit langgestrecktem Kanal zum Ausstossen von orthogonal gerichteten Tröpfchen mit verbesserter Arbeitsgeschwindigkeit - Google Patents

Auf Abruf arbeitender Tintenstrahldruckkopf mit langgestrecktem Kanal zum Ausstossen von orthogonal gerichteten Tröpfchen mit verbesserter Arbeitsgeschwindigkeit Download PDF

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Publication number
EP0716926A2
EP0716926A2 EP95309100A EP95309100A EP0716926A2 EP 0716926 A2 EP0716926 A2 EP 0716926A2 EP 95309100 A EP95309100 A EP 95309100A EP 95309100 A EP95309100 A EP 95309100A EP 0716926 A2 EP0716926 A2 EP 0716926A2
Authority
EP
European Patent Office
Prior art keywords
length
series
channels
ink
ink jet
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.)
Granted
Application number
EP95309100A
Other languages
English (en)
French (fr)
Other versions
EP0716926B1 (de
EP0716926A3 (de
Inventor
Lowell M. Good
David B. Wallace
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.)
Compaq Computer Corp
Original Assignee
Compaq Computer Corp
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 Compaq Computer Corp filed Critical Compaq Computer Corp
Publication of EP0716926A2 publication Critical patent/EP0716926A2/de
Publication of EP0716926A3 publication Critical patent/EP0716926A3/de
Application granted granted Critical
Publication of EP0716926B1 publication Critical patent/EP0716926B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • B41J2/14209—Structure of print heads with piezoelectric elements of finger type, chamber walls consisting integrally of piezoelectric material
    • 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
    • B41J2202/00—Embodiments of or processes related to ink-jet or thermal heads
    • B41J2202/01—Embodiments of or processes related to ink-jet heads
    • B41J2202/18—Electrical connection established using vias

Definitions

  • such ink jet printheads may be further classified as "length-mode" ink jet printheads.
  • the longitudinal extension of the channels are bounded by an ink ejection orifice on one end and by an interconnection with an ink supply on the other.
  • this longitudinal extension creates a single dominant acoustic resonance frequency which is proportional to the length of the channels.
  • the length of this longitudinal extension of the channels acts as limit on the maximum operating frequency of the printhead. More specifically, in order to prevent operating frequency induced variations in the volume and/or velocity of droplets ejected by a channel of a length-mode ink jet printhead, the channel must be limited to operating frequencies below the second or third subharmonic, i.e. f RES /2 or f RES /3 of the resonant frequency f RES . Thus, if an increase in the operating speed of a length-mode ink jet printhead is desired, the length of the channels may be reduced appropriately.
  • capillary pressure induces replenishing ink to flow towards the orifice of the channel to compensate for the losses in ink due to droplet ejection.
  • This capillary pressure is controlled by various factors which include orifice geometry, orifice material, surface tension and the shape and position of the ink meniscus. As the rate at which droplets are ejected from the channel is increased, the rate of ink flow in the channel and the pressure drop within the channel due to viscous losses increase.
  • EP-A-0648161 disclosed a page wide ink jet printhead having a series of elongated grooves formed in a block of active piezoelectric material. A corresponding series of channels are then formed by covering the grooves with a sheet of polymer material. Rather than placing the ink ejection orifices at one end of the resultant channels, the open ends of the channels are dammed and ink ejection orifices are ablated in the sheet of polymer material which forms the roof of the channels. However, as the orifices are formed proximate to one end of the channels, the resonant frequency of the channels are not significantly affected by placement of the orifices along the roof thereof. Accordingly, the frequency at which a selected channel may be actuated will not vary appreciably due to placement of its ink ejection orifice along the roof of the channel.
  • the interior sidewall is comprised of a first wall at least partially formed of an active piezoelectric material and a second wall formed of an inactive material.
  • means for applying an electric field to the first wall to cause a piezoelectric deflection of the first wall is also provided.
  • the ink ejection orifice is formed in the second wall and extends between the channel and a top side surface included as part of the exterior surface of the main body portion.
  • the ink ejection orifice is located midway between the interior front wall and the interior rear wall of the printhead and the means for supplying ink to the channel includes an ink supply, a first ink conduit having a first end coupled to the ink supply and a second end coupled to the channel at the interior front wall, and a second ink conduit having a first end coupled to the ink supply and a second end coupled to the channel at the interior rear wall.
  • the present invention is of a length-mode ink jet printhead comprised of a body portion having a series of general parallel channels extending between an exterior front wall and an exterior rear wall of the body portion. Each of the channels are bounded by first and second interior sidewalls at least partially formed of active piezoelectric material. A series of ink ejection orifices are formed in the body portion such that each one extends from an exterior sidewall thereof to a corresponding one of the series of channels. Also provided are means for supplying ink to the channels and means for imparting an acoustic pressure wave to ink contained in a selected one of the channels to eject a droplet of ink from the ink ejection orifice in communication with the selected channel.
  • the length-mode ink jet printhead further includes a first acoustic pressure wave reflection interface coupled to the exterior front wall of the main body portion and a second acoustic pressure wave reflection interface coupled to the exterior rear wall of the main body portion such that forwardly propagating pressure waves generated in the series of channels are reflected off the first acoustic pressure wave reflection interface and rearwardly propagating pressure waves generated in the series of channels are reflected off the second acoustic pressure wave reflection interface.
  • each one of the series of channels has a length to height ratio of greater than 10:1 and, in another aspect thereof, each one of the series of channels has a length to height ratio of between about 25:1 and about 250:1.
  • the rearwardly propagating portion of the acoustic pressure wave imparted to the rearward part of the channel 40a reflects off the rear manifold plate 50 of the ink jet printhead 10 and begins to propagate forwardly in the channel 40a while the forwardly propagating portion of the acoustic pressure wave imparted to the forward part of the channel 40a reflects off the front manifold plate 48 and begins to propagate rearwardly in the channel 40b.

Landscapes

  • Particle Formation And Scattering Control In Inkjet Printers (AREA)
EP19950309100 1994-12-16 1995-12-14 Auf Abruf arbeitender Tintenstrahldruckkopf mit langgestrecktem Kanal zum Ausstossen von orthogonal gerichteten Tröpfchen mit verbesserter Arbeitsgeschwindigkeit Expired - Lifetime EP0716926B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US357725 1989-05-26
US35772594A 1994-12-16 1994-12-16

Publications (3)

Publication Number Publication Date
EP0716926A2 true EP0716926A2 (de) 1996-06-19
EP0716926A3 EP0716926A3 (de) 1997-04-16
EP0716926B1 EP0716926B1 (de) 2002-03-13

Family

ID=23406766

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19950309100 Expired - Lifetime EP0716926B1 (de) 1994-12-16 1995-12-14 Auf Abruf arbeitender Tintenstrahldruckkopf mit langgestrecktem Kanal zum Ausstossen von orthogonal gerichteten Tröpfchen mit verbesserter Arbeitsgeschwindigkeit

Country Status (3)

Country Link
EP (1) EP0716926B1 (de)
JP (1) JPH08230187A (de)
DE (1) DE69525821T2 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1029678A2 (de) * 1999-02-17 2000-08-23 Konica Corporation Tintenstrahldruckkopf
JP2016034720A (ja) * 2014-08-01 2016-03-17 株式会社東芝 インクジェットヘッド

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0277703A1 (de) 1987-01-10 1988-08-10 Xaar Limited Tröpfchen-Niederschlagvorrichtung
EP0528648A1 (de) 1991-08-16 1993-02-24 Compaq Computer Corporation Längsseitige Betätigungseinrichtung für einen Tintenstrahldruckkopf hoher Dichte

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0595654A3 (en) * 1992-10-30 1997-07-23 Citizen Watch Co Ltd Ink jet head

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0277703A1 (de) 1987-01-10 1988-08-10 Xaar Limited Tröpfchen-Niederschlagvorrichtung
EP0528648A1 (de) 1991-08-16 1993-02-24 Compaq Computer Corporation Längsseitige Betätigungseinrichtung für einen Tintenstrahldruckkopf hoher Dichte

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1029678A2 (de) * 1999-02-17 2000-08-23 Konica Corporation Tintenstrahldruckkopf
EP1029678A3 (de) * 1999-02-17 2000-12-27 Konica Corporation Tintenstrahldruckkopf
US6568797B2 (en) 1999-02-17 2003-05-27 Konica Corporation Ink jet head
JP2016034720A (ja) * 2014-08-01 2016-03-17 株式会社東芝 インクジェットヘッド

Also Published As

Publication number Publication date
EP0716926B1 (de) 2002-03-13
EP0716926A3 (de) 1997-04-16
JPH08230187A (ja) 1996-09-10
DE69525821D1 (de) 2002-04-18
DE69525821T2 (de) 2002-09-19

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