EP0062353B1 - Dispositif d'enregistrement à gouttelettes de liquide - Google Patents

Dispositif d'enregistrement à gouttelettes de liquide Download PDF

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Publication number
EP0062353B1
EP0062353B1 EP82102955A EP82102955A EP0062353B1 EP 0062353 B1 EP0062353 B1 EP 0062353B1 EP 82102955 A EP82102955 A EP 82102955A EP 82102955 A EP82102955 A EP 82102955A EP 0062353 B1 EP0062353 B1 EP 0062353B1
Authority
EP
European Patent Office
Prior art keywords
recording device
nozzles
inlet opening
inlet
outlet 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.)
Expired
Application number
EP82102955A
Other languages
German (de)
English (en)
Other versions
EP0062353A1 (fr
Inventor
Jan Bolmgren
Bertil Dr. Hoek
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 EP0062353A1 publication Critical patent/EP0062353A1/fr
Application granted granted Critical
Publication of EP0062353B1 publication Critical patent/EP0062353B1/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
    • B41J2002/14475—Structure thereof only for on-demand ink jet heads characterised by nozzle shapes or number of orifices per chamber

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 for writing the individual points there are nozzles arranged in rows in a common carrier with a large-area inlet opening and, relative thereto, a small, essentially point-shaped outlet opening an equal number of piezoelectric transducers lying parallel to one another are arranged in the inlet openings and the transducers are contacted such that writing fluid is ejected from the nozzle in the event of electrical voltage changes due to the piezoelectric movements generated and is applied to a recording medium arranged in front of the outlet opening of the nozzles.
  • Such a writing instrument is known from DE-OS 25 27 647.
  • the piezoelectric transducers generate a flow velocity of the ink in the area immediately in front of each transducer.
  • this speed would not be sufficient for an ink droplet to clear the surface of an opening in the carrier and leave it.
  • a sufficient speed can only be obtained by using nozzles as speed-transforming elements.
  • the area ratio between the inlet and outlet opening of the nozzles is decisive for the speed transformation.
  • the transformation factor is at most equal to this ratio.
  • the transformation factor is, however, in practice due to energy losses, e.g. B. reduced by turbulence of the ink flow.
  • the energy losses are influenced by the shape of the nozzles.
  • the nozzles are conical in the subject of DE-OS 25 27 647 and have a circular cross section.
  • the smaller outlet opening has a diameter of approx. 50 wm so that a suitable droplet volume is obtained.
  • the larger inlet opening has a diameter of at least 150 ⁇ m if an increase in ink flow speed by a factor of 9 is required.
  • the nozzles In order to get a clear tender, the nozzles must be placed close together. If the distance between each nozzle z. B. should be 250 j.Lm, it is very complicated and therefore expensive to maintain the appropriate diameter of the inlet opening of the nozzles.
  • the piezoelectric transducers must lie very close to one another, since they are intended to cover the inlet opening of the nozzles.
  • the invention has for its object to provide a writing instrument of the type mentioned, in which the inlet openings of the nozzles can be kept large in a structurally simple manner, without sacrificing the close mutual distance between the nozzles. Good hydraulic separation of the nozzles should also be provided.
  • the inlet opening has a preferably elongated cross-sectional shape which deviates from the circular shape and, with its longitudinal extension, extends essentially transversely to the direction of the row of nozzles. Because of the elongated shape of the inlet opening, the inlet surface can be kept large even when the nozzles are closely spaced from one another. Furthermore, the distance from one edge of one nozzle to the opposite edge of the adjacent nozzle is relatively large. This makes the manufacture of the carrier with the nozzles easier and cheaper. Furthermore, good hydraulic separation of the nozzles has been achieved, which allows a high writing speed.
  • FIG. 3 shows the outer basic structure of a known writing instrument.
  • the record carrier 3, z. B normal registration paper, pulled 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 conical nozzles 11 arranged next to one another in such a way that the nozzle inlet opening 12 for the ink present in the housing 7 is larger than the nozzle outlet opening 13.
  • rods or transducers 14 made of piezoelectric material in the housing 7, which are contacted and arranged in such a way that they are in the form of a writing liquid with appropriate electrical control Spray droplets out of the nozzle 11.
  • the piezo comb consisting of the transducer 14 and the comb back 15 is arranged parallel to the plane of the carrier 10.
  • the free end area of the individual transducers 14 is located in front of the individual nozzles 11 of the row of nozzles.
  • the comb back 15 is screwed with a fastening screw set 16 onto the carrier 10 receiving the row of nozzles.
  • the inlet openings 12 of the nozzles 11 which are arranged in series are arranged very closely next to one another, which makes the manufacture considerably more difficult. As a result, there is only poor hydraulic separation of the nozzles 11. It is also shown that the transducers must be attached very closely to one another in order to cover the nozzle inlet openings 12.
  • the inlet opening 17 of a nozzle 18 has an elongated cross-sectional shape that deviates from the circular shape and extends with its longitudinal extension transverse to the direction of the row of nozzles. It can be seen from the figure that the transverse extent of the inlet opening 17 corresponds to that of the outlet opening 19.
  • the ratio of the areas of inlet opening 17 to outlet opening 19 is preferably 10: 1.
  • the inlet opening is substantially rectangular, the corners being rounded.
  • the transverse extent of the inlet opening 17 is at least one factor 1.5 smaller than the nozzle spacing in a row. Because of the inventive design of the inlet openings 17 of the nozzles, the distance from one edge to the opposite edge of an adjacent nozzle is relatively large.
  • the inlet area of the nozzles can be kept large despite the nozzle spacing being maintained. Because of the shape of the inlet opening, the distance between adjacent transducers 14 increases while the nozzle distance remains the same, which simplifies production and reduces the mechanical coupling.
  • Fig. 2 it is shown in more detail that the connecting edge surface 20 between the inlet opening 17 and outlet opening 19 funnel-shaped, z. B. is exponential. Because of this shape, the energy losses, e.g. B. generated due to turbulence in the ink flow, largely avoided.
  • the angle of the funnel surface is also selected such that total reflection of a pressure wave applied to the inlet opening 17 is avoided during operation.
  • the shape of the transducers can be adapted to these surfaces. This increases the distance between adjacent transducers, which essentially simplifies production.

Claims (8)

1. Enregistreur opérant avec des gouttelettes de liquide et servant à enregistrer sous forme de points des courbes analogiques ou des caractères alphanumériques ainsi que des images, et dans lequel pour l'enregistrement des différents points il est prévu des buses disposées selon une rangée dans un support commun et possédant une ouverture d'entrée de plus grande surface et une ouverture de sortie d'une taille comparativement plus petite que cette ouverture et essentiellement de forme ponctuelle, et dans lequel un nombre identique de transducteurs, piézoélectriques parallèles entre eux sont disposés devant les ouvertures d'entrée et l'établissement du contact avec le branchement électrique est réalisé, de telle sorte que dans le cas de variations électriques de la tension sous l'effet des déplacements piézoélectriques produits, l'encre est éjectée de la buse et est déposé sur un support d'enregistrement prévu à l'avant de l'ouverture de sortie des buses, caractérisé par le fait que l'ouverture d'entrée (17) possède une section transversale de préférence de forme allongée, différant de la forme circulaire, et que son extension longitudinale est essentiellement transversale par rapport à la direction de la rangée de buses.
2. Enregistreur suivant la revendication 1, caractérisé par le fait que l'extension transversale Le l'ouverture d'entrée (17) correspond à celle de l'ouverture de sortie (19).
3. Enregistreur suivant la revendication 1 ou 2, caractérisé par le fait que le rapport de la surface de l'ouverture d'entrée (17) à la surface de l'ouverture de sortie (19) est compris entre 5 : 1 et 25 : 1 et est égal de préférence à environ 10 : 1.
4. Enregistreur selon l'une des revendications 1 à 3, caractérisé par le fait que l'ouverture d'entrée (17) possède une forme essentiellement rectangulaire, dont les angles sont de préférence arrondis.
5. Enregistreur selon l'une des revendications 1 à 4, caractérisé par le fait que l'extension transversale de l'ouverture d'entrée (17) est inférieure, au moins d'un facteur 1,5 à la distance entre les buses d'une rangée.
6. Enregistreur suivant l'une des revendications 1 à 5, caractérisé par le fait que la surface marginale de liaison (20) entre l'ouverture d'entrée et l'ouverture de sortie (17, 19) possède une forme d'entonnoir, de préférence une forme exponentielle.
7. Enregistreur suivant la revendication 6, caractérisé par le fait que l'angle de la surface de l'entonnoir est choisi de telle sorte que, pendant le fonctionnement, la réflexion totale d'une onde de pression appliquée à l'ouverture d'entrée est évitée.
8. Enregistreur suivant l'une des revendications 1 à 7, caractérisé par le fait que les différents transducteurs (14) sont adaptés à la forme de la surface d'entrée (17).
EP82102955A 1981-04-08 1982-04-06 Dispositif d'enregistrement à gouttelettes de liquide Expired EP0062353B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3114259 1981-04-08
DE19813114259 DE3114259A1 (de) 1981-04-08 1981-04-08 Mit fluessigkeitstroepfchen arbeitendes schreibgeraet

Publications (2)

Publication Number Publication Date
EP0062353A1 EP0062353A1 (fr) 1982-10-13
EP0062353B1 true EP0062353B1 (fr) 1984-08-15

Family

ID=6129706

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82102955A Expired EP0062353B1 (fr) 1981-04-08 1982-04-06 Dispositif d'enregistrement à gouttelettes de liquide

Country Status (5)

Country Link
US (1) US4409602A (fr)
EP (1) EP0062353B1 (fr)
JP (1) JPS57178768A (fr)
BR (1) BR8202010A (fr)
DE (2) DE3114259A1 (fr)

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4879568A (en) * 1987-01-10 1989-11-07 Am International, Inc. Droplet deposition apparatus
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.
CH688960A5 (de) 1994-11-24 1998-06-30 Pelikan Produktions Ag Tropfenerzeuger fuer Mikrotropfen, insbesondere fuer einen Ink-Jet-Printer.
US5598261A (en) * 1995-07-07 1997-01-28 Lockheed Missiles & Space Company, Inc. Wavefront sensor for a scanning imager
US5610707A (en) * 1995-07-07 1997-03-11 Lockheed Missiles & Space Co., Inc. Wavefront sensor for a staring imager
US6123413A (en) * 1995-10-25 2000-09-26 Hewlett-Packard Company Reduced spray inkjet printhead orifice
US6371596B1 (en) 1995-10-25 2002-04-16 Hewlett-Packard Company Asymmetric ink emitting orifices for improved inkjet drop formation
US6371600B1 (en) 1998-06-15 2002-04-16 Lexmark International, Inc. Polymeric nozzle plate
DE19911399C2 (de) * 1999-03-15 2001-03-01 Joachim Heinzl Verfahren zum Ansteuern eines Piezo-Druckkopfes und nach diesem Verfahren angesteuerter Piezo-Druckkopf
JP4296893B2 (ja) * 2003-09-30 2009-07-15 ブラザー工業株式会社 ノズルプレートの製造方法
US7274442B2 (en) * 2005-05-16 2007-09-25 The Boeing Company Closed-loop wavefront sensor using field programmable gate array

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3211088A (en) * 1962-05-04 1965-10-12 Sperry Rand Corp Exponential horn printer
US3958255A (en) * 1974-12-31 1976-05-18 International Business Machines Corporation Ink jet nozzle structure
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
US4014029A (en) * 1975-12-31 1977-03-22 International Business Machines Corporation Staggered nozzle array
US4303927A (en) * 1977-03-23 1981-12-01 International Business Machines Corporation Apparatus for exciting an array of ink jet nozzles and method of forming
JPS55117666A (en) * 1979-03-01 1980-09-10 Ricoh Co Ltd Multi-nozzle plate unit for ink jet device
US4282533A (en) * 1980-02-22 1981-08-04 Celanese Corporation Precision orifice nozzle devices for ink jet printing apparati and the process for their manufacture

Also Published As

Publication number Publication date
JPS57178768A (en) 1982-11-04
EP0062353A1 (fr) 1982-10-13
JPH0324342B2 (fr) 1991-04-03
US4409602A (en) 1983-10-11
DE3114259A1 (de) 1982-11-04
BR8202010A (pt) 1983-03-15
DE3260571D1 (en) 1984-09-20

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