EP0131704B1 - Dispositif d'enregistrement à gouttelettes de liquide - Google Patents

Dispositif d'enregistrement à gouttelettes de liquide Download PDF

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Publication number
EP0131704B1
EP0131704B1 EP84105201A EP84105201A EP0131704B1 EP 0131704 B1 EP0131704 B1 EP 0131704B1 EP 84105201 A EP84105201 A EP 84105201A EP 84105201 A EP84105201 A EP 84105201A EP 0131704 B1 EP0131704 B1 EP 0131704B1
Authority
EP
European Patent Office
Prior art keywords
transducers
transducer
carrier plate
recording device
liquid droplets
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
EP84105201A
Other languages
German (de)
English (en)
Other versions
EP0131704A1 (fr
Inventor
Nilsson Dipl.-Ing. Kenth
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
Original Assignee
Siemens AG
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 filed Critical Siemens AG
Publication of EP0131704A1 publication Critical patent/EP0131704A1/fr
Application granted granted Critical
Publication of EP0131704B1 publication Critical patent/EP0131704B1/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
    • B41J2/14201—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
    • B41J2/14—Structure thereof only for on-demand ink jet heads
    • B41J2002/14379—Edge shooter

Definitions

  • the invention relates to a writing instrument working with droplets of liquid according to the preamble of claim 1.
  • Such a writing instrument is known from DE-C-2 527 647.
  • the writing instrument has a carrier mounted between the recording medium and transducer parallel to the latter, and has a number of nozzles arranged in a row next to one another. Each nozzle lies in the area of the greatest vibration amplitude and in the direction of the deflection of the transducers.
  • several of these converters must be arranged one behind the other in the paper transport direction. Because of the length of the transducers, the locations for the different color droplets are considerably distant from one another, so that an incorrect shift between the individual color dots can easily occur due to incorrect paper transport. If two or more converters are used to increase the resolution, this can lead to image deterioration.
  • the transducers are perpendicular to the recording medium, the nozzles being arranged in the direct axis extension of the transducers.
  • the transducers in particular in the case of small dimensions, not only lengthen in a straight line when electrical voltage changes occur at their contacts, but also bend. This can cause malfunctions when ejecting liquid droplets from the nozzles.
  • EP-A-0 067 889 describes a liquid recorder with a channel matrix designed as a write head.
  • the write head has a complicated construction with channels that zigzag from the liquid storage chamber to the outlet openings. This is necessary so that strips of piezo elements, which run on the outer walls of the write head and transverse to the longitudinal direction of the channels, can act on at least part of the respective channel. Due to the zigzag formation of the channels, air bubbles can get stuck at the corners and it can be difficult to vent the channel system. This leads to an uneven droplet frequency and droplet quality. In addition, due to the structure of the write head, only a limited number of channels can be installed one after the other.
  • the invention has for its object to provide a writing instrument of the type mentioned, which is relatively simple in construction and in which a tight attachment of any number of transducers is possible in a row.
  • the carrier plate have grooves which run below and parallel to the respective transducer. This improves the shape and orientation of the ejected liquid droplets.
  • each transducer facing the carrier plate has a groove running in its longitudinal direction. Compared to the grooves in the carrier plate, there is the advantage that the converter and carrier plate no longer have to be aligned with one another so precisely. 4th
  • a nozzle plate is attached between the transducer with plate and recording medium, each nozzle being arranged in the axis extension of the intermediate space between the corresponding transducer and the carrier plate.
  • the grooves can be omitted. Due to the construction of the transducer according to the invention, liquid can now be expelled through the nozzles. At the same time it is achieved that all liquid droplets have the same, defined size.
  • the transducers be arranged on both sides of the carrier. The result of this is that the transducers can be attached extremely close to one another.
  • 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.
  • FIG. 1 shows how rod-shaped piezoelectric transducers 10 are arranged perpendicular to the recording medium 3 in the housing 7.
  • the comb comb common to all transducers 11 is fastened with a fastening arrangement 12 to a carrier plate 13 fixedly arranged in the housing 7.
  • 1 shows that the transducers are bilaminar and are formed from a piezoceramic layer 14 and a metal layer 15.
  • Writing liquid is provided between the carrier plate 13 and the transducers 10. When electrical voltage is applied to a contact, not shown, of a transducer 10, this moves into the position shown in dashed lines.
  • transducer 10 When a transducer 10 is short-circuited, it snaps back into the non-bent position drawn with solid lines and in doing so presses a droplet of writing fluid forward onto the recording medium 3 in the direction of the transducer axis.
  • This embodiment of transducer 10 with carrier plate 13 is preferably used when larger liquid droplets are desired.
  • the carrier plate 13 has grooves 16 which run below and parallel to the respective transducer 10.
  • the grooves 16 are clearly visible in FIG. 3.
  • the transducers can be attached closely to a carrier plate provided with grooves 16, so that a unit which is compact in construction is obtained.
  • the grooves enable a very good resolution and an equally good alignment of the individual ink outputs.
  • FIG. 5 shows in a further exemplary embodiment that a nozzle plate 17 is attached between transducer 10 with carrier plate 13 and recording medium 3, each nozzle 18 being arranged in the axis extension of the intermediate space between transducer 10 and carrier plate 13.
  • the grooves 16 can be omitted.
  • a predetermined exact shaping and alignment of the liquid droplets can be obtained through the nozzles 18.
  • FIG. 6 shows the construction of a plurality of transducers 10 with carrier plates 13 in close succession in the pen housing 7.
  • the relatively small distance between the transducers is particularly important when writing characters or images with different colors, since the characters or images can be preserved very clearly.
  • transducers 10 are arranged on both sides of the carrier plate 13.
  • the transducers 10 can hereby be attached extremely close together.
  • the nozzle plate 17 is not absolutely necessary. Instead, the carrier plates can be provided with grooves 16 (FIGS. 1 to 4). It is also possible to dispense with both nozzle plate 17 and grooves 16.

Claims (5)

1. Dispositif d'enregistrement (1 à 18) opérant avec des gouttelettes de liquide et servant à enregistrer sous la forme de points des variations analogiques ou des caractères alphanumériques ainsi que des images sur un support d'enregistrement (3), et dans lequel pour la production des gouttelettes de liquide, il est prévu des transducteurs piézoélectriques (10) en forme de barreaux, disposés en série, dont une extrémité est fixée par serrage et qui sont raccordés de telle sorte qu'ils fléchissent perpendiculairement au plan dans lequel se situent les transducteurs (10), dans le cas de variations de la tension électrique au niveau de l'organe de contact, et dans lequel une plaque de support (13) est disposée parallèlement aux transducteurs (10) à une distance telle que, lors du retour des transducteurs (10) dans leur position initiale, des gouttelettes de liquide sont éjectées du dispositif d'enregistrement, caractérisé par le fait que l'éjection des gouttelettes de liquide s'effectue approximativement dans la direction des barreaux, directement entre chaque transducteur (10) et la plaque de support (13).
2. Dispositif d'enregistrement suivant la revendication 1, caractérisé par le fait qu'entre chaque transducteur (10) muni de la plaque de support (13) et le support d'enregistrement (3) se trouve disposée une plaque à buses (17), dont chaque buse (18) est disposée dans le prolongement axial de l'espace intercalaire entre chaque transducteur (10) et la plaque de support (13).
3. Dispositif d'enregistrement suivant la revendication 1, caractérisé par le fait que la plaque de support (13) comporte des rainures (16) qui s'étendent au-dessous de transducteurs (10) respectifs et parallèlement à ces derniers.
4. Dispositif d'enregistrement suivant la revendication 1, caractérisé par le fait que la face de chaque transducteur (10), tournée vers la plaque de support (13), possède une rainure (16) s'étendant dans la direction longitudinale de ce transducteur.
5. Dispositif d'enregistrement suivant l'une des revendications 1 à 4, caractérisé par le fait que les transducteurs (10) sont disposés sur les deux faces de la plaque de support (13).
EP84105201A 1983-05-10 1984-05-08 Dispositif d'enregistrement à gouttelettes de liquide Expired EP0131704B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3317082 1983-05-10
DE19833317082 DE3317082A1 (de) 1983-05-10 1983-05-10 Mit fluessigkeitstroepfchen arbeitendes schreibgeraet

Publications (2)

Publication Number Publication Date
EP0131704A1 EP0131704A1 (fr) 1985-01-23
EP0131704B1 true EP0131704B1 (fr) 1988-09-14

Family

ID=6198655

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84105201A Expired EP0131704B1 (fr) 1983-05-10 1984-05-08 Dispositif d'enregistrement à gouttelettes de liquide

Country Status (4)

Country Link
US (1) US4566018A (fr)
EP (1) EP0131704B1 (fr)
JP (1) JPS59212275A (fr)
DE (2) DE3317082A1 (fr)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4887100A (en) * 1987-01-10 1989-12-12 Am International, Inc. Droplet deposition apparatus
US4998120A (en) * 1988-04-06 1991-03-05 Seiko Epson Corporation Hot melt ink jet printing apparatus
EP0678384B1 (fr) * 1990-02-23 1997-08-20 Seiko Epson Corporation Tête d'impression à jet d'encre générant des gouttelettes à la demande
US6186619B1 (en) * 1990-02-23 2001-02-13 Seiko Epson Corporation Drop-on-demand ink-jet printing head
JP3041952B2 (ja) * 1990-02-23 2000-05-15 セイコーエプソン株式会社 インクジェット式記録ヘッド、圧電振動体、及びこれらの製造方法
US5465108A (en) * 1991-06-21 1995-11-07 Rohm Co., Ltd. Ink jet print head and ink jet printer
JPH0596739A (ja) * 1991-10-09 1993-04-20 Rohm Co Ltd インクジエツトプリントヘツドの製造方法
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
DE19626428A1 (de) * 1996-07-01 1998-01-15 Heinzl Joachim Tröpfchenwolkenerzeuger
DE10139397B4 (de) 2001-08-10 2005-12-22 Tallygenicom Computerdrucker Gmbh Tropfenerzeuger für Mikrotropfen, insbesondere Düsenkopf für Tintendrucker

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2527647C3 (de) * 1975-06-20 1981-06-25 Siemens AG, 1000 Berlin und 8000 München Mit Flüssigkeitströpfchen arbeitendes Schreibgerät
US4158847A (en) * 1975-09-09 1979-06-19 Siemens Aktiengesellschaft Piezoelectric operated printer head for ink-operated mosaic printer units
JPS5933117B2 (ja) * 1978-09-01 1984-08-13 株式会社日立製作所 インクジエツト記録装置
US4243995A (en) * 1979-06-01 1981-01-06 Xerox Corporation Encapsulated piezoelectric pressure pulse drop ejector apparatus
JPS57113075A (en) * 1980-12-30 1982-07-14 Fujitsu Ltd Ink jet head
DE3114224A1 (de) * 1981-04-08 1982-11-04 Siemens AG, 1000 Berlin und 8000 München Mit fluessigkeitstroepfchen arbeitendes schreibgeraet
DE3114192A1 (de) * 1981-04-08 1982-10-28 Siemens AG, 1000 Berlin und 8000 München Mit fluessigkeitstroepfchen arbeitendes schreibgeraet
WO1983000657A1 (fr) * 1981-08-14 1983-03-03 William Anthony Denne Dispositif generateur de gouttes pour une imprimante a jet d'encre
US4453169A (en) * 1982-04-07 1984-06-05 Exxon Research And Engineering Co. Ink jet apparatus and method

Also Published As

Publication number Publication date
US4566018A (en) 1986-01-21
JPS59212275A (ja) 1984-12-01
EP0131704A1 (fr) 1985-01-23
DE3317082A1 (de) 1984-11-15
JPH0436070B2 (fr) 1992-06-15
DE3474008D1 (en) 1988-10-20

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