EP0713773B1 - Générateur de micro-gouttelettes en particulier pour imprimante à jet d'encre - Google Patents

Générateur de micro-gouttelettes en particulier pour imprimante à jet d'encre Download PDF

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Publication number
EP0713773B1
EP0713773B1 EP95810667A EP95810667A EP0713773B1 EP 0713773 B1 EP0713773 B1 EP 0713773B1 EP 95810667 A EP95810667 A EP 95810667A EP 95810667 A EP95810667 A EP 95810667A EP 0713773 B1 EP0713773 B1 EP 0713773B1
Authority
EP
European Patent Office
Prior art keywords
transducers
generator according
droplet generator
partitions
nozzles
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 - Lifetime
Application number
EP95810667A
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German (de)
English (en)
Other versions
EP0713773A3 (fr
EP0713773A2 (fr
Inventor
Joachim Heinzl
Wolfgang Schullerus
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.)
Pelikan Produktions AG
Original Assignee
Pelikan Produktions 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 Pelikan Produktions AG filed Critical Pelikan Produktions AG
Publication of EP0713773A2 publication Critical patent/EP0713773A2/fr
Publication of EP0713773A3 publication Critical patent/EP0713773A3/fr
Application granted granted Critical
Publication of EP0713773B1 publication Critical patent/EP0713773B1/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
    • B41J2/14201—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
    • B41J2202/00—Embodiments of or processes related to ink-jet or thermal heads
    • B41J2202/01—Embodiments of or processes related to ink-jet heads
    • B41J2202/03—Specific materials used
    • 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
    • B41J2202/11—Embodiments of or processes related to ink-jet heads characterised by specific geometrical characteristics

Definitions

  • DE-OS 31 14 192 is a drop generator for microdrops known. Are in an ink-filled chamber of a housing arranged a plurality of piezoelectric bending transducers, each associated with a nozzle leading through a housing wall are. If a converter is actuated, the corresponding one Ejected a droplet of ink. This drop generator is easy to set up. However, the printed image is unsatisfactory sometimes uneven and washed out. Similar drop generators are in DE-OS 31 14 224 and in DE-OS 31 14 259.
  • the piezoelectric transducers are thickness transducers.
  • they and theirs expand End faces generate a pressure wave that ejects droplets causes.
  • thickness transducers is because of the small Face of the transducer the volume displaced with them small for a drop ejection. Therefore the environment of the Face with the speed of sound of the ink and the speed of movement the front surface acoustically matched that the volume moved in the nozzles is increased. Some of them.
  • Embodiments partition walls between the Piezoelectric transducers provided for lateral spread to prevent the build-up of the pressure wave.
  • the present invention has for its object a Drop generator with a variety of piezoelectric bending transducers to be designed in such a way that the printed image is improved. This task is accomplished through the combination of features of the claims solved.
  • the partitions between the individual bending transducers crosstalk between the adjacent transducers completely avoided.
  • the partitions reliably prevent that when actuated one transducer ink from an adjacent one Nozzle can escape, because the flow can no longer up Spread out to the neighboring nozzle.
  • the partitions also bring a significant increase of efficiency. Because the ink is under the activated bending transducer can no longer dodge sideways, is the same Deflection produces a significantly higher pressure at the nozzle. Therefore can on the one hand a much higher and more constant drop flight speed and on the other hand a lower power requirement can be achieved.
  • the drop generator according to FIGS. 1-5 has a housing 1 from a nozzle plate 2, a frame 3 and a cover plate 4, which together form a chamber 5.
  • the nozzle plate 2 has a rectilinear row adjacent to a wall 6 of the frame 3 regularly spaced nozzles 7.
  • the cover plate 4 has an inlet opening 8 opening into the chamber 5 for connecting an ink reservoir, not shown.
  • On one attached to or attached to the nozzle plate 2 molded base 9 arranged opposite the wall 6 a piezoelectric transducer unit 12 attached and cooperating Positioning means positioned e.g. through pens 10, which are inserted into holes in the base 9 and in Engage holes in unit 12.
  • the unit 12 consists of a piezoceramic plate 13, the top with a thin metal foil 14 and the bottom with a thicker metal foil 15 is laminated. From the free end 16 over the nozzles 7 to the base 9 are in this composite plate slots 17 are cut at regular intervals, e.g. With ground a diamond disc, so that the element 12 a comb-like structure with a connecting web 18 over the Has base 9 and tines 19.
  • the film 14 is on the web 18 in Extension of the slots 17 interrupted so that for each tine 19 a film strip is formed.
  • the film 15 is against it continuously on the web 18 and protrudes beyond the plate 13 on the end face. It is with a connecting line 20 for the return conductor connected.
  • Each strip of film 14 is one Connection line 21 connected for the outgoing conductor. Like from figures 3 and 4 can be seen, are on the end face of the nozzle plate 2 partition walls 26 connected to a chamber wall 6, 25 attached, the two tines 19 separate from each other and are narrower than the slots 17.
  • FIGS. 2a to 2d Drop generator shown schematically Figure 2a shows one Prong 19 at rest. There is in the liquid chamber 5 Negative pressure, so that a concave meniscus 28 is located in the nozzle 7 forms its capillary pressure in equilibrium with the negative pressure stands. If a voltage is now applied to connection 21, tries the piezoceramic layer 13 of the prong 19 shorten under the influence of the electric field (cross-effect). This shortening is used by the thicker metal foil 15 stronger resistance to the thinner metal foil 14 so that the tine 19 bends away from the nozzle plate 2 (FIG 2 B).
  • the rate of deformation is determined by a suitable choice the pulse shape at port 21 is selected so that the fluid meniscus 28 withdraws very little in the nozzle 7.
  • the pulse at port 21 drops and the previous drain introduced electrical charge, the tine 19 snaps back in the basic position ( Figure 2c) and from the nozzle 7 is a Drop 29 expelled.
  • Figure 2d briefly adjusts the state represents the drop ejection.
  • the liquid meniscus 28 has withdrawn deeper into the nozzle 7. Liquid flows through the entry opening 8 until the meniscus 28 is again its Has reached equilibrium.
  • coating materials e.g. ORMOCERe (organically modified ceramics), epoxies, acrylates, polyurethanes and thermoplastic Polymers used.
  • the selection depends on the working fluid used because the coating is resistant towards the liquid is required. The liquid but must also wet the coated surfaces well, thus a perfect ventilation of the chamber 5 of the drop generator is possible.
  • the non-conductive coating ensures that too electrically conductive inks, e.g. Water-based inks, which in printing applications are desired in many cases can be.
  • too electrically conductive inks e.g. Water-based inks
  • the state of the art could only be electric non-conductive inks are used. This was the area of application of these devices significantly limited. Also more expensive this property may significantly affect the ink.
  • a bimorph bending transducer element 12 is shown in FIG. It consists of the piezoceramic layer 13, the relative thick, glued metal foil 15, which at the same time the Forms electrode for the return conductor and the electrode 34, which replaces the thinner metal foil 14 according to FIGS. 1-5.
  • generating high field strengths is the same as for the Embodiment according to Figures 1-5 relatively high voltages required.
  • the required ones Tensions lower than in the embodiment according to Figures 1-5.
  • FIG. 7 shows a so-called SS-CMB (single sided ceramic multilayer bender). These converters are in "Actuator 94 Conference Proceedings ", Bremen 1994 by J. Verkerk et al. described in more detail to which reference is made.
  • the element 12 here consists of an active piezoceramic layer 35, a passive piezoceramic layer 36 and a plurality of electrode layers 37, which divide the layer 35 into several layers and alternately with front metallizations 38, 39 and thus connected to the connecting lines 20, 21 are.
  • the layers 40 of the layer 35 are alternately opposite polarized. Because the field direction also has a location alternates to the position, the Layer 35 as a whole is shorter than passive layer 36 or longer depending on the polarity of the applied voltage.
  • FIG 8 is a symmetrical multi-layer bending transducer element 12 shown. It is created by laminating two layers 45, 46 piezoactive materials with the same polarity direction. The connected to one another by the end metallization 38 Outer electrodes 47 are common to all tines the return conductor 20 connected. The center electrode 48 is before laminating the second piezoactive layer 45 in extension the slots 17 are cut. When applying a voltage between the center and outer electrodes there will be each Layer across the electric field according to its direction in change their length, i.e. one layer is shortened, the other expands. Because the layers are firmly bonded together the layer structure bends. With this too Construction can significantly increase the tension required for deflection be reduced because the tine thickness is the same and the same Voltage the field strength is doubled and both layers 45, 46 are active in the bending sense, while in the embodiment 6, the film 15 only acts passively.
  • the partitions 26 must much larger aspect ratios. Suitable techniques for this are available today, e.g. the LIGA process or anisotropic etching of silicon single crystals. These methods are described in W. Menz, P. Bley; Microsystem technology for engineers, Weinheim 1993. Other suitable Methods for the production of the partitions are for Example of the galvanic deposition of metals on the nozzle plate 2, the embossing or injection molding, being in these last In both cases, the molds were produced using the LIGA process can be.
  • the partitions 26 in one piece with the nozzle plate 2, the frame 3, the base 9 and possibly the partition 25 ( Figure 4) are formed.
  • Other suitable procedures to produce the partition walls 26 are the photolithographic Structuring of photoresist lacquers or foils.
  • FIGS. 9-11 show variants in which the housing 1 has a plurality of staggered chambers 5 with one converter element 12 each according to FIGS. 1-3 or according to contains one of the figures 6-8.
  • the axes of the nozzles 7 run at least at the exit end inclined or at right angles to the direction of movement the tine ends 16.
  • the nozzles 7 are against the Outlet cross section narrowed.
  • the nozzles 7 of the different ones Rows are somewhat opposite to each other in the longitudinal direction of the rows transferred.
  • FIG. 9 there are three identical housing elements 55 corresponding to Figure 1 but with a thicker nozzle plate 56 and an additional nozzle plate 56 stacked one on top of the other.
  • the nozzle channel 57 is bent at a right angle.
  • An additional channel 58 connects the inlet opening 8 with a distribution channel 59 in a cover plate 60.
  • the axes of the Nozzles 7 at 45 ° to the direction of movement of the tine ends 16.
  • FIG. 11 there are four rows of nozzles 7 arranged in a continuous nozzle plate 65 and the Tine ends 16 are ground at 45 ° so that their end faces 66 run parallel to the plate 65.
  • the chambers 5 have here side connections, which are connected to the Storage containers can be connected.
  • the connections can but can also be connected to a separate container, the containers containing inks of different colors can, so that the drop generator is also suitable for multi-color printing is suitable.
  • This variant is also in the embodiments according to Figures 9 and 10 possible by the distributor plate 60 is omitted and the channels 58 to separate Container can be connected.

Landscapes

  • Particle Formation And Scattering Control In Inkjet Printers (AREA)

Claims (13)

  1. Générateur de gouttelettes pour produire des micro-gouttelettes, notamment pour une imprimante à jet d'encre, comprenant un boítier (1) pourvu d'une chambre (5), une pluralité de transducteurs piézoélectriques flexibles (19) situés dans la chambre (5) et dont une première extrémité (18) est fixée au boítier (1),
    ainsi qu'un gicleur (7) situé dans une paroi (2) de la chambre, au-dessous de la seconde extrémité libre (16) des transducteurs (19), caractérisé en ce que la chambre (5) est subdivisée, au moins au voisinage de la seconde extrémité (16) des transducteurs (19), par des parois de séparation (26) situées entre ces transducteurs (19).
  2. Générateur de gouttelettes selon la revendication 1, dans lequel les premières extrémités (18) des transducteurs (19) sont reliées entre elles de telle sorte que les transducteurs (19) forment une unité à transducteurs en forme de peigne (12).
  3. Générateur de gouttelettes selon la revendication 1 ou 2, dans lequel le rapport de la hauteur a l'épaisseur des parois de séparation (26) est dans l'intervalle 10-100.
  4. Générateur de gouttelettes selon l'une des revendications 1 - 3, dans lequel les parois de séparation (26) sont formées par dépôt galvanique d'un métal ou par corrosion anisotrope de silicium monocristallin ou par moulage par injection ou par gaufrage ou par formation photographique de laques de photorésine ou de feuilles de photorésine.
  5. Générateur de gouttelettes selon l'une des revendications 1 - 4, dans lequel les parois de séparation (28) sont réunies d'un seul tenant à une plaque à gicleurs (2), à travers laquelle s'étendent des gicleurs (7).
  6. Générateur de gouttelettes selon l'une des revendications 1 - 5, dans lequel les faces frontales des secondes extrémités (16) des transducteurs (19) sont séparées d'une paroi (6) de la chambre par une distance qui est égale au mamximum au quintuble de l'espace intercalaire entre les transducteurs (19) et les parois de séparation (26).
  7. Générateur de gouttelettes selon l'une des revendications 1 - 6, dans lequel les sections transversales de sortie des gicleurs (7) sont rétrécies en direction de leur sortie.
  8. Générateur de gouttelettes selon l'une des revendications 1 - 7, dans lequel les surfaces des transducteurs (19) sont pourvues d'un revêtement non électriquement conducteur, qui est constitué de préférence par un matériau ORMOCER ou par une résine époxy ou par un polymère d'acrylate ou par du polyuréthanne.
  9. Générateur de gouttelettes selon l'une des revendications 1 - 8, dans lequel les transducteurs (19) et le boítier (1) possèdent des éléments de posittionnement (10) qui coopèrent entre eux.
  10. Générateur de gouttelettes selon l'une des revendications 1 - 9, dans lequel les transducteurs (19) sont réalisés sous la forme de transducteurs piézocéramique à couches multiples comportant une couche piézocéramique passive supplémentaire ou bien sont agencés sous la forme de transducteurs symétriques flexibles à couches multiples.
  11. Générateur de gouttelettes selon l'une des revendications 1 - 10, dans lequel, dans leur position de base, les transducteurs (19) sont situés à distance de la plaque à injecteur (2), au niveau de leurs deux extrémités (16).
  12. Générateur de gouttelettes selon l'une des revendications 1 - 11, dans lequel dans le boítier (1) sont disposées plusieurs chambres (5) qui sont décalées et qui contiennent chacune une série de transducteurs (19), de parois de séparation (26) et de gicleurs (7), les axes des gicleurs (7) étant inclinés au moins au niveau de la section transversale de sortie ou s'étendant perpendiculairement à la direction de déviation des secondes extrémités (16) des transducteurs.
  13. Générateur de gouttelettes selon l'une des revendications 1 - 12, dans lequel les surfaces frontales des secondes extrémités (16) des transducteurs (19) sont découpées et inclinées par rapport à la direction longitudinale des transducteurs (19).
EP95810667A 1994-11-24 1995-10-27 Générateur de micro-gouttelettes en particulier pour imprimante à jet d'encre Expired - Lifetime EP0713773B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
CH3545/94 1994-11-24
CH03545/94A CH688960A5 (de) 1994-11-24 1994-11-24 Tropfenerzeuger fuer Mikrotropfen, insbesondere fuer einen Ink-Jet-Printer.
CH354594 1994-11-24

Publications (3)

Publication Number Publication Date
EP0713773A2 EP0713773A2 (fr) 1996-05-29
EP0713773A3 EP0713773A3 (fr) 1997-04-16
EP0713773B1 true EP0713773B1 (fr) 1999-12-15

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EP95810667A Expired - Lifetime EP0713773B1 (fr) 1994-11-24 1995-10-27 Générateur de micro-gouttelettes en particulier pour imprimante à jet d'encre

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US (1) US5739832A (fr)
EP (1) EP0713773B1 (fr)
CH (1) CH688960A5 (fr)
DE (1) DE59507429D1 (fr)

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Publication number Publication date
DE59507429D1 (de) 2000-01-20
EP0713773A3 (fr) 1997-04-16
CH688960A5 (de) 1998-06-30
EP0713773A2 (fr) 1996-05-29
US5739832A (en) 1998-04-14

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