EP1164014A1 - Appareil de jets de liquide et procédé de commandement pour jets de liquide - Google Patents

Appareil de jets de liquide et procédé de commandement pour jets de liquide Download PDF

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Publication number
EP1164014A1
EP1164014A1 EP00112694A EP00112694A EP1164014A1 EP 1164014 A1 EP1164014 A1 EP 1164014A1 EP 00112694 A EP00112694 A EP 00112694A EP 00112694 A EP00112694 A EP 00112694A EP 1164014 A1 EP1164014 A1 EP 1164014A1
Authority
EP
European Patent Office
Prior art keywords
jet
liquid
burst signal
signal
vibration exciter
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
EP00112694A
Other languages
German (de)
English (en)
Other versions
EP1164014B1 (fr
Inventor
Hiroyuki Nakagawa
Hiroshi Fukumoto
Jyunichi Aizawa
Yasuhiko Ozaki
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.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric 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 Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to EP20000112694 priority Critical patent/EP1164014B1/fr
Priority to DE2000606366 priority patent/DE60006366T2/de
Publication of EP1164014A1 publication Critical patent/EP1164014A1/fr
Application granted granted Critical
Publication of EP1164014B1 publication Critical patent/EP1164014B1/fr
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
    • B41J2/14008—Structure of acoustic ink jet print heads

Definitions

  • the vibration exciter has a first vibration exciter supplied with the jet burst signal and a second vibration exciter supplied with the suppressing signal.
  • the jet burst signal and the suppressing signal are supplied for the vibration exciter repeatedly with a second frequency.
  • the second frequency is a frequency with which the liquid makes free vibration in a mode specific to the shape of the opening.
  • the jet burst signal is supplied for the vibration exciter repeatedly during a period required for a to-and-fro movement of a surface wave in the opening, which is excited on the basis of a radiation pressure to push the liquid out from the opening in a period while the vibration exciter is driven.
  • the suppressing signal is a pulse to be supplied in order for the vibration exciter to provide the liquid with a pressure.
  • the suppressing signal is supplied at the same cycle as the jet burst signal, the motion of liquid becomes stationary and stable droplets are jetted.
  • the second frequency set to be larger than the period while the jet burst signal is supplied, the meniscus of liquid in the opening is retreated towards the side of the vibration exciter, to narrow the width of jetting liquid.
  • the hydrostatic pressure applying mechanism by applying the hydrostatic pressure to the liquid so that the meniscus of the liquid reaches the rim of the opening in a waiting state where the liquid is in a stationary state as the jet burst signal is not supplied and reducing the hydrostatic pressure or applying the negative pressure when the jet burst signal is supplied, it is possible to prevent the meniscus from spilling over from the opening. That makes the meniscus stable, and avoids jet failure of the liquid and jetting of large droplets.
  • the vibration provided for the liquid on the basis of the jet burst signal also works as the radiation pressure to push the liquid out from the opening in the period. Since the pressure opposite to the radiation pressure is provided for the liquid in the period while the radiation pressure works, the method of the eighteenth aspect can produce the same effect as the method of the thirteenth aspect.
  • the vibration exciter 9a has an ultrasonic vibration exciter, for example, a piezoelectric vibrator 92, and further a protection sheet 91 between the body 94 and the piezoelectric vibrator 92, for protecting the piezoelectric vibrator 92 so that it should not be wetted by the ink 30.
  • an ultrasonic vibration exciter for example, a piezoelectric vibrator 92
  • a protection sheet 91 between the body 94 and the piezoelectric vibrator 92, for protecting the piezoelectric vibrator 92 so that it should not be wetted by the ink 30.
  • burst cycle T2 At a value slightly shifted from the time required for the to-and-fro movement of the second surface wave in the opening 95. It falls within correction of burst cycle of this description, however, to adjust the cycle of variation in level of ink 30 due to the second surface wave and the burst cycle T2 for keeping equally the shape of meniscus at the point of time when the jet burst signal 26 is supplied.
  • Figs. 21A to 21C are waveform views showing a liquid jet driving technique in accordance with the fifth preferred embodiment of the present invention.
  • Fig. 21A shows a timing for supplying the jet burst signal 26
  • Fig. 21B shows a timing for supplying the pressure pulse signal
  • Fig. 21C shows the center position in the surface of the ink 30 which is exposed in the opening 95.
  • the base lines of Figs. 21A to 21C show the same as those of Figs. 19A to 19C. For convenience, it is shown that the negative pressure pulse signal is supplied at the point of time when the pressure pulse signal becomes "L".
  • the third to fifth preferred embodiments can be also achieved with the ink head 9 having the structure of Fig. 2 by driving the piezoelectric vibrator 92 with the pressure pulse signal, instead of using the ink head 9 having the structure of Fig. 18.
  • providing the pressure pulse generator 96 additionally to the piezoelectric vibrator 92 driven with the jet burst signal 26 is better for easy designing.
  • Fig. 23 is a cross section schematically showing the state of meniscus of the ink 30 in a waiting state of the ink head.
  • the "waiting state of the ink head” refers to a stationary state where only atmospheric pressure is applied to the ink 30 for a long time.
  • the ink 30 is retreated towards the piezoelectric vibrator 92 while keeping wetting against the inner wall of the nozzle plate 93 with surface tension, and the meniscus is out of contact with the rim of the opening 95.
  • the jet burst signal 26 when the jet burst signal 26 is supplied from the waiting state of the ink head, it is desirable to provide the ink 30 with the hydrostatic pressure, to push the liquid level of the ink 30 up to the rim of the opening 95, and to reduce the hydrostatic pressure or provide a negative hydrostatic pressure after the jet burst signal 26 is supplied for the piezoelectric vibrator 92.
  • the seventh preferred embodiment proposes a control to avoid the state where the meniscus of the ink 30 is out of contact with the rim of the opening 95 while preventing the ink 30 from spilling over from the opening 95. It is possible, however, to control the hydrostatic pressure while keeping the liquid surface of the ink 30 in contact with the rim of the opening 95 also in the state where the ink head is driven at the dot cycle T3, instead of the waiting state of the ink head.
EP20000112694 2000-06-15 2000-06-15 Appareil de jets de liquide et procédé de commandement pour jets de liquide Expired - Lifetime EP1164014B1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP20000112694 EP1164014B1 (fr) 2000-06-15 2000-06-15 Appareil de jets de liquide et procédé de commandement pour jets de liquide
DE2000606366 DE60006366T2 (de) 2000-06-15 2000-06-15 Flüssigkeitsstrahlgerät und Flüssigkeitsstrahl-Ansteuermethode

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP20000112694 EP1164014B1 (fr) 2000-06-15 2000-06-15 Appareil de jets de liquide et procédé de commandement pour jets de liquide

Publications (2)

Publication Number Publication Date
EP1164014A1 true EP1164014A1 (fr) 2001-12-19
EP1164014B1 EP1164014B1 (fr) 2003-11-05

Family

ID=8168987

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20000112694 Expired - Lifetime EP1164014B1 (fr) 2000-06-15 2000-06-15 Appareil de jets de liquide et procédé de commandement pour jets de liquide

Country Status (2)

Country Link
EP (1) EP1164014B1 (fr)
DE (1) DE60006366T2 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7097280B2 (en) 2004-02-12 2006-08-29 Lexmark International, Inc. Printheads having improved heater chip construction
CN109720106A (zh) * 2017-10-30 2019-05-07 惠普赛天使公司 打印试剂干燥

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5122818A (en) * 1988-12-21 1992-06-16 Xerox Corporation Acoustic ink printers having reduced focusing sensitivity
EP0557048A2 (fr) * 1992-02-19 1993-08-25 Xerox Corporation Procédé et dispositif pour la suppression des ondes capillaires dans une imprimante à jet d'encre
EP0845357A2 (fr) * 1996-10-30 1998-06-03 Mitsubishi Denki Kabushiki Kaisha Dispositif a ejection de liquide et imprimante l'utilisant
US5798779A (en) * 1995-03-16 1998-08-25 Fujitsu Limited Ultrasonic printing apparatus and method in which the phases of the ultrasonic oscillators are controlled to prevent unwanted phase cancellations
US5877789A (en) * 1995-06-12 1999-03-02 Oce-Nederland B.V. Acoustic pressure wave propagating ink-system

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5122818A (en) * 1988-12-21 1992-06-16 Xerox Corporation Acoustic ink printers having reduced focusing sensitivity
EP0557048A2 (fr) * 1992-02-19 1993-08-25 Xerox Corporation Procédé et dispositif pour la suppression des ondes capillaires dans une imprimante à jet d'encre
US5798779A (en) * 1995-03-16 1998-08-25 Fujitsu Limited Ultrasonic printing apparatus and method in which the phases of the ultrasonic oscillators are controlled to prevent unwanted phase cancellations
US5877789A (en) * 1995-06-12 1999-03-02 Oce-Nederland B.V. Acoustic pressure wave propagating ink-system
EP0845357A2 (fr) * 1996-10-30 1998-06-03 Mitsubishi Denki Kabushiki Kaisha Dispositif a ejection de liquide et imprimante l'utilisant

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7097280B2 (en) 2004-02-12 2006-08-29 Lexmark International, Inc. Printheads having improved heater chip construction
CN109720106A (zh) * 2017-10-30 2019-05-07 惠普赛天使公司 打印试剂干燥
CN109720106B (zh) * 2017-10-30 2020-12-18 惠普赛天使公司 打印试剂干燥单元和方法

Also Published As

Publication number Publication date
DE60006366D1 (de) 2003-12-11
DE60006366T2 (de) 2004-08-26
EP1164014B1 (fr) 2003-11-05

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