EP0062888B1 - Mit Flüssigkeitströpfchen arbeitendes Schreibgerät - Google Patents

Mit Flüssigkeitströpfchen arbeitendes Schreibgerät Download PDF

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Publication number
EP0062888B1
EP0062888B1 EP82102954A EP82102954A EP0062888B1 EP 0062888 B1 EP0062888 B1 EP 0062888B1 EP 82102954 A EP82102954 A EP 82102954A EP 82102954 A EP82102954 A EP 82102954A EP 0062888 B1 EP0062888 B1 EP 0062888B1
Authority
EP
European Patent Office
Prior art keywords
transducers
printing device
tooth
nozzles
bilaminar
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
EP82102954A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0062888A1 (de
Inventor
Jan Bolmgren
Kenth Dipl.-Ing. Nilsson
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.)
Siemens AG
Siemens Elema AB
Original Assignee
Siemens AG
Siemens Elema AB
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 Siemens AG, Siemens Elema AB filed Critical Siemens AG
Publication of EP0062888A1 publication Critical patent/EP0062888A1/de
Application granted granted Critical
Publication of EP0062888B1 publication Critical patent/EP0062888B1/de
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
    • B41J2/14201—Structure of print heads with piezoelectric elements
    • B41J2/14282—Structure of print heads with piezoelectric elements of cantilever type
    • 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
    • B41J2/145—Arrangement thereof
    • B41J2/155—Arrangement thereof for line printing
    • 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 writing device working with liquid droplets for the point-by-point recording of analog courses or alphanumeric characters as well as images, whereby there are nozzles arranged in rows for writing the individual points, from the inlet openings of which piezoelectric transducers contacted are arranged such that writing fluid occurs when the voltage changes at the contact ejected from the nozzle and applied to a recording medium arranged in front of the outlet opening of the nozzles that rod-shaped piezoelectric transducers are provided for generating the piezoelectric movements, the free end region of the transducers being individually assigned to an inlet opening of the nozzles and the transducers made of bilaminar material Piezoceramic and a carrier material are made.
  • Such a writing instrument is known from DE-A 25 27 647.
  • crosstalk between this and the adjacent tooth can occur due to hydraulic coupling by means of the writing fluid. This can lead to the neighboring tooth being set in motion and driving writing fluid out of the nozzle assigned to it.
  • each tooth In order to achieve good writing quality, each tooth must be in the rest position before it is actuated. If two adjacent teeth are to be actuated one after the other, the first actuated tooth should not cause the neighboring tooth to vibrate.
  • the time interval between the actuation pulses must be made so long that the vibration of the adjacent tooth has subsided.
  • the result is a sharp drop in the maximum write speed.
  • the vibration of the adjacent tooth can be effectively dampened by a high viscosity of the writing fluid, but at the same time the hydraulic coupling between the teeth is increased.
  • the vibration speed of a tooth is greatest at the tip. Therefore, the hydraulic coupling force between the teeth is greatest in the tip area of the teeth.
  • the distance between the teeth can be increased to reduce the hydraulic coupling. However, this lowers the writing quality because the distance between the nozzles increases.
  • the invention has for its object to provide a writing instrument of the type mentioned, in which the hydraulic coupling between the teeth is reduced so that crosstalk from an activated tooth to the adjacent teeth is largely avoided.
  • the viscosity of the liquid is denoted by t l .
  • the force is therefore proportional to the speed difference v and the area A.
  • the speed of an activated tooth is greatest in the free end area.
  • the coupling force between the teeth is therefore greatest in the end region of the tooth. Due to the fact that the transducers or the teeth in the end region are relatively thin according to the invention (area A is very small), the hydraulic coupling and thus also crosstalk between the teeth is largely avoided.
  • Another advantage is that the resonance frequency increases, which allows a higher writing speed.
  • the end region consists only of carrier material, e.g. B. metal, because the tooth can bump against the nozzle plate during its vibration. The end region or the metal tongue then takes up the blow; the more fragile piezoceramic is less stressed. In this way, the life of the writing instrument increases.
  • the ceramic part is removed at least over such a fraction of the transducer length which is between 1/2 and 1/5, preferably 1/3 of the transducer length.
  • the length of the metal tongue is chosen so that the resonance frequency of the end region is always above the resonance frequency of the entire tooth, including the tongue. In certain cases, e.g. B. if a liquid with a low viscosity is used, the resonance frequency of the end region (tongue) can be made lower than that of the bilaminar part.
  • the tongue then functions like a swing that can be set in motion by the bilaminar part.
  • the recording carrier 3 z. B. normal registration paper, drawn in the direction of arrow 4 over a spacer 5 on the side 6 of the housing 7.
  • the connecting line 8 is guided, which is provided at its free end with a plug 9 for connection to a control device, not shown, which supplies the control signals for recording the desired courses, characters or images.
  • the side 6 is the side of a carrier 10 which has a number of nozzles 11 arranged side by side in a row.
  • rod-shaped transducers 12 made of piezoelectric material are present in the housing, which are contacted and arranged in such a way that they spray writing fluid in the form of a droplet from the nozzle 11 with appropriate electrical control.
  • the piezo comb 14 consisting of the teeth 12 and the comb back 13 is arranged parallel to the plane of the carrier 10.
  • FIG. 3 shows that the comb-like piezo plate is bilaminar and is formed from a piezoceramic layer 16 and a metal layer 17.
  • the free end area of the individual teeth 12 is located in front of the individual nozzles 11 of the row of nozzles. In this area, the piezoceramic layer 16 is removed from the metal layer 17.
  • the piezoceramic layer 16 may be removed 12 by such a fraction of the tooth is between 1/2 and 1/5, preferably 1/3 of the tooth length.
  • the comb back 13 is screwed to the carrier 10 receiving the row of nozzles with a fastening screw set 15.
  • electrical voltage is applied to the contacts of a tooth 12, it moves into the position shown in dashed lines in FIG. 3. If the applied voltage is interrupted, it snaps back into the non-curved position drawn with solid lines and presses a droplet of writing fluid through the nozzle 11.
  • the length of the metal tongue of a tooth 12 must be chosen so that its resonance frequency is well above the resonance frequency of the entire tooth including the metal tongue. In certain cases, especially when writing fluid with a low viscosity is used, the resonance frequency of a relatively long metal tongue can be made low compared to the resonance frequency of the bilaminar part.
  • the tooth 12 then functions like a swing set in motion by the bilaminar part (Fig. 4). 4 shows that the metal layer can be ground in the end region of the tooth 12 after the ceramic layer has been removed. 5 shows that the bilaminar tooth 12 is ground to become thinner at its end. By keeping the end portion of the teeth as thin as possible, there is a maximum reduction in the hydraulic coupling between the teeth 12. Crosstalk from an activated tooth to the neighboring teeth is thus largely avoided, so that good writing quality and at the same time a high writing speed can be achieved.
  • ceramic or glass e.g. B. alumina may be provided.

Landscapes

  • Particle Formation And Scattering Control In Inkjet Printers (AREA)
EP82102954A 1981-04-08 1982-04-06 Mit Flüssigkeitströpfchen arbeitendes Schreibgerät Expired EP0062888B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19813114224 DE3114224A1 (de) 1981-04-08 1981-04-08 Mit fluessigkeitstroepfchen arbeitendes schreibgeraet
DE3114224 1981-04-08

Publications (2)

Publication Number Publication Date
EP0062888A1 EP0062888A1 (de) 1982-10-20
EP0062888B1 true EP0062888B1 (de) 1985-02-13

Family

ID=6129695

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82102954A Expired EP0062888B1 (de) 1981-04-08 1982-04-06 Mit Flüssigkeitströpfchen arbeitendes Schreibgerät

Country Status (5)

Country Link
US (1) US4438441A (enrdf_load_stackoverflow)
EP (1) EP0062888B1 (enrdf_load_stackoverflow)
JP (1) JPS57178769A (enrdf_load_stackoverflow)
BR (1) BR8202039A (enrdf_load_stackoverflow)
DE (2) DE3114224A1 (enrdf_load_stackoverflow)

Families Citing this family (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3306101A1 (de) * 1983-02-22 1984-08-23 Siemens AG, 1000 Berlin und 8000 München Mit fluessigkeitstroepfchen arbeitendes schreibgeraet
DE3317082A1 (de) * 1983-05-10 1984-11-15 Siemens AG, 1000 Berlin und 8000 München Mit fluessigkeitstroepfchen arbeitendes schreibgeraet
DE3320441A1 (de) * 1983-06-06 1984-12-06 Siemens AG, 1000 Berlin und 8000 München Mit fluessigkeitstroepfchen arbeitendes schreibgeraet mit an beiden enden starr mit einer duesenplatte verbundenen stabfoermigen piezoelektrischen wandlern
US5000786A (en) * 1987-11-02 1991-03-19 Seiko Epson Corporation Ink composition and ink jet recording apparatus and method
DE68907434T2 (de) * 1988-04-12 1994-03-03 Seiko Epson Corp Tintenstrahlkopf.
US5126755A (en) * 1991-03-26 1992-06-30 Videojet Systems International, Inc. Print head assembly for ink jet printer
JP3161635B2 (ja) * 1991-10-17 2001-04-25 ソニー株式会社 インクジェットプリントヘッド及びインクジェットプリンタ
US5786833A (en) * 1993-10-07 1998-07-28 Seiko Epson Corporation Piezoelectric driver for an ink jet recording head, including front end plate having front end face aligned with front end face of inactive region of driver
CH688960A5 (de) * 1994-11-24 1998-06-30 Pelikan Produktions Ag Tropfenerzeuger fuer Mikrotropfen, insbesondere fuer einen Ink-Jet-Printer.
US6516509B1 (en) * 1996-06-07 2003-02-11 Canon Kabushiki Kaisha Method of manufacturing a liquid jet head having a plurality of movable members
US6270202B1 (en) * 1997-04-24 2001-08-07 Matsushita Electric Industrial Co., Ltd. Liquid jetting apparatus having a piezoelectric drive element directly bonded to a casing
DE19911399C2 (de) * 1999-03-15 2001-03-01 Joachim Heinzl Verfahren zum Ansteuern eines Piezo-Druckkopfes und nach diesem Verfahren angesteuerter Piezo-Druckkopf
US7015624B1 (en) * 1999-10-22 2006-03-21 The United States Of America As Represented By The Administrator Of The National Aeronautics And Space Administration Non-uniform thickness electroactive device

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2900536A (en) 1954-11-18 1959-08-18 Astatic Corp Design of electro-mechanical transducer elements
DE1267241B (de) * 1966-11-21 1968-05-02 Motorola Inc Vorrichtung zum Druck von Fernschreibzeichen auf einem druckempfindlichen Blattmaterial mit einer Mehrzahl von Stiften
DE2045108C3 (de) * 1970-09-11 1978-05-03 Braun Ag, 6000 Frankfurt Piezoelektrischer Antrieb
DE2527647C3 (de) * 1975-06-20 1981-06-25 Siemens AG, 1000 Berlin und 8000 München Mit Flüssigkeitströpfchen arbeitendes Schreibgerät
JPS5218276A (en) * 1975-08-01 1977-02-10 Nippon Sheet Glass Co Ltd Device and process to cut web in orthogonal symetry
JPS5410731A (en) * 1977-06-27 1979-01-26 Ricoh Co Ltd Liquid injector
JPS5413340A (en) * 1977-07-01 1979-01-31 Ricoh Co Ltd Liquid injecting device

Also Published As

Publication number Publication date
EP0062888A1 (de) 1982-10-20
DE3262280D1 (en) 1985-03-28
DE3114224A1 (de) 1982-11-04
JPH0231667B2 (enrdf_load_stackoverflow) 1990-07-16
US4438441A (en) 1984-03-20
JPS57178769A (en) 1982-11-04
BR8202039A (pt) 1983-03-22

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