EP0116971B1 - Tête d'écriture à actionneurs piézo-électriques avec une matrice de canaux - Google Patents

Tête d'écriture à actionneurs piézo-électriques avec une matrice de canaux Download PDF

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Publication number
EP0116971B1
EP0116971B1 EP84101681A EP84101681A EP0116971B1 EP 0116971 B1 EP0116971 B1 EP 0116971B1 EP 84101681 A EP84101681 A EP 84101681A EP 84101681 A EP84101681 A EP 84101681A EP 0116971 B1 EP0116971 B1 EP 0116971B1
Authority
EP
European Patent Office
Prior art keywords
strips
piezo
recording head
plate
electric
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
EP84101681A
Other languages
German (de)
English (en)
Other versions
EP0116971A1 (fr
Inventor
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 EP0116971A1 publication Critical patent/EP0116971A1/fr
Application granted granted Critical
Publication of EP0116971B1 publication Critical patent/EP0116971B1/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
    • B41J2/14209—Structure of print heads with piezoelectric elements of finger type, chamber walls consisting integrally of piezoelectric material
    • 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
    • B41J2002/14379—Edge shooter
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49401—Fluid pattern dispersing device making, e.g., ink jet

Definitions

  • the invention relates to a piezoelectrically operated writing head for ink mosaic writing devices with writing nozzles in the form of ink channels receiving writing liquid, from which the writing liquid is ejected drop by drop by piezoelectric deformation of a drive element.
  • the writing head consists of a perforated matrix with a row of nozzles, in front of the inlet opening of which rod-shaped piezoelectric elements are arranged in such a way that the piezo elements bend when a voltage is applied and thereby drop-wise write liquid ejects from the corresponding nozzle (DE-PS-25 27 647).
  • the individual rod-shaped piezoelectric elements are combined to form a kind of comb and are thus connected to one another via a common web.
  • Great demands must be placed on the manufacture of the comb as well as the perforated die, particularly with regard to the tolerances, in order to ensure that the print head functions properly. For the same reason, the die matrix and comb must be carefully adjusted.
  • write heads consist of a single workpiece made of dielectric plastic in the casting process and which contains a plurality of channels which hold the writing fluid (DE-PS-25 43 451) These channels are likewise closed off by a perforated matrix towards the recording medium.
  • the outlet openings can be arranged so close to one another that the desired high recording quality is obtained
  • the ink channels are radially directed away from these outlet openings and the piezoceramic tubes are arranged at a distance from the outlet openings complex to manufacture and also has a large mass, so that correspondingly large acceleration forces are necessary for the rapid deflection of such a write head.
  • the object of the present invention is to design the write head mentioned at the outset in a mechanically stable manner and, moreover, to significantly simplify production.
  • efforts are also being made to keep the mass to be accelerated as small as possible.
  • the ink channels are formed by a channel matrix, which consists of a series of strips of piezoelectric material which are arranged in parallel at a distance from one another and in this way delimit the ink channels, make electrical contact and open on both sides both sides are covered by a plate.
  • a channel matrix which consists of a series of strips of piezoelectric material which are arranged in parallel at a distance from one another and in this way delimit the ink channels, make electrical contact and open on both sides both sides are covered by a plate.
  • the strips z. B. be formed by sawing grooves in a solid plate made of piezoelectric material, which are then only to be covered on the top with a plate to form the channel matrix. The rest of the solid plate remains the lower plate. In this way, rectangular channels for the ink are created between the strips of piezoelectric material.
  • the dimensions of the strips and the spaces can advantageously be chosen so that the channels formed between the strips themselves form the writing nozzles.
  • a separate perforated matrix can therefore be dispensed with. This eliminates the otherwise complex adjustment between the die and the piezo comb or between the die and the workpiece with the ink channels.
  • the channel matrix according to the invention is mechanically robust and nevertheless small and light, so that an extremely high deflection speed of the print head is possible with reasonable forces.
  • the liquid contained in the channels is ejected uniformly in both directions
  • attempts have shown that a sufficiently large ejection takes place in the direction of a recording medium arranged in front of the write head. Since the ink channels on the back are connected directly to a storage chamber for writing liquid, the abrupt change in cross-section causes a reflection of the liquid wave running in this direction, so that the majority of the displaced liquid is ejected in the direction of the recording medium.
  • the strips of piezoelectric material are rigidly connected to a carrier plate, it is particularly advantageous if this carrier plate is kept so thin that the longitudinal expansion of the piezoelectric strips does not cause the carrier plate and thus the entire channel matrix to bend. Particularly favorable mechanical properties are obtained if the strips are additionally reinforced on the top by a layer - in particular made of metal - which offers approximately the same resistance to the longitudinal expansion as the lower carrier plate.
  • the carrier plate is made directly of metal, it can be used as a common electrode for all strips of piezoelectric material.
  • the channel matrix is particularly simple to manufacture if a bilaminar material made of carrier material and piezoelectric material is used and the strip structure is produced, for example, by sawing in the piezoelectric material. After the corresponding contact of the strips on the top, only a cover plate is applied as a finish. Every second channel can in turn be filled with an elastic material or air.
  • Another particularly advantageous production of the print head is based on a laminate of piezoelectric material provided on both sides with a metal layer, from which longitudinal channels are worked out alternately from one side and once from the other.
  • the depth of the channels extends approximately over a metal layer and the piezoelectric material.
  • the channel plate produced in this way is closed off at least on one side with a continuous plate.
  • This structure also has the advantage that the channel plate can be intentionally broken in the longitudinal direction by different layers, so that the tensile stress that occurs when a voltage is applied can no longer spread. Nevertheless, the mechanical stability of the entire arrangement is completely preserved.
  • the outer basic structure of an ink mosaic writing device can be seen from FIG.
  • the recording medium 3, for example normal registration paper, is pulled past the front face 6 of the housing 7 in the direction of arrow 4 via transport rollers 1 and 2.
  • the connecting line 8 is guided, which is provided at its free end with a plug 9 for connection to a corresponding control device which supplies the control signals for recording the desired courses, characters or images.
  • the housing 7 contains the actual write head, of which a possible embodiment is shown in perspective in FIG. 2.
  • the writing head consists of a channel matrix 10 and a reservoir 11 for writing liquid 12.
  • ink channels 13 to 16 are indicated by dashed lines, which are formed by two plates 17 and 18 and the strips 20 to 27 between them made of piezoelectric material.
  • the electrical contacting of the piezoelectric strips has been omitted here.
  • the plate 17 can be made of metal and form a common electrode for all common strips 20 to 27 made of piezoelectric material. The other side of the strips must then be contacted in pairs. If the plate 18 is also made of conductive material, insulation must be provided between it and the contacts.
  • FIG. 3 shows a cross section through the channel matrix corresponding to FIG. 2.
  • a nickel foil serves as the carrier plate 17.
  • the piezoelectric material 20 to 27 is applied in strips. These strips are provided in pairs with electrical contacts 30 to 33.
  • the end is formed by the end plate 18, which in this case should consist of a non-conductive material.
  • this representation indicates that every second channel 34 to 36 formed is filled with an elastic material, for example silicone rubber.
  • the width of the piezoelectric strips is 50 ⁇ m and the distance between the adjacent strips is just as much, you get mosquito-like female pages 8 and 9, instead of a description pages 8, 9 and 9a, initially from 19.6.85 a distance the writing nozzles (cannula 13 to 16) of 200 fJ.m. This means that five writing nozzles per mm are provided, with which very good recording quality can already be achieved.
  • the thickness of the strips can be approximately in the are of the same order of magnitude. In order to get a sufficiently large ink output without excessive voltage amplitudes, the length of the channel matte can be approximately 10 mm.
  • the thickness of the carrier plate 17 and the cover plate 18 is approximately 20 11 m.
  • FIG. 4 shows an enlarged section of the illustration according to FIG. 3 in two different states.
  • the state in which a voltage is applied to the contacts to the two strips 20 and 21 made of piezoelectric material is represented by solid lines, so that these strips become narrower and higher.
  • the state in which the strips of piezoelectric material have returned to their original shape is shown in dashed lines.
  • dashed lines As can be seen from this illustration, when a voltage is applied to the piezoelectric strips, the channel cross-sectional area is enlarged and in this way additional writing liquid is sucked into the channel.
  • the strips return to their original shape and thereby reduce the enclosed channel volume in such a way that the writing fluid to be displaced is ejected as drops on the front of the channel matrix.
  • FIG. 5 again shows in cross section a further embodiment of a channel die 40.
  • This essentially consists of a laminate made of piezoelectric material 41, which is provided on both sides with a metal layer 42 or 43.
  • Channels 44 to 47 are introduced into this laminate alternately from the top and bottom, for example by sawing.
  • the channels each extend through a metal layer and the layer made of piezoelectric material. It should be pointed out at this point that these channels do not necessarily have to pass through the entire layer of piezoelectric material. Every second channel can in turn contain air and be sealed off from the storage chamber.
  • the piezoelectric write head according to FIG. 5 can also be produced in that a carrier plate is provided in strips with a conductive layer on a surface, that piezoelectric material is applied in strips thereof, that the piezoelectric strips are electrically contacted in pairs and that a cover plate is applied in an insulated manner.
  • a carrier plate is provided in strips with a conductive layer on a surface, that piezoelectric material is applied in strips thereof, that the piezoelectric strips are electrically contacted in pairs and that a cover plate is applied in an insulated manner.
  • a bilaminar plate made of carrier material and piezoelectric material, in which the strip structure is produced by working out piezoelectric material in certain areas.
  • the strips By preventing the expansion of the strips of piezoelectric material in the longitudinal direction by means of reinforcement on the top of these strips, the strips become practically narrower than usual when a voltage is applied. In this way, an approximately 30 percent stronger effect can be achieved with the same achieve the applied voltage. In other words, the same effect can be achieved with a reduced voltage and thus overall with a reduced power to be applied.
  • a further advantage of the channel matrix according to the exemplary embodiment according to FIG. 5 is that the tensile stress in the longitudinal direction caused by the deformation of the strips of piezoelectric material can be suppressed by intentionally breaking the piezoelectric material several times in the longitudinal direction. The resulting fine transverse cracks do not change the mechanical stability of the entire duct matrix, but the tensile stresses can no longer spread in the longitudinal direction.
  • FIG. 6 again shows in a schematic cross-sectional representation that two channel matrices 50 and 60 can be arranged tightly packed, for example to increase the resolution.
  • two Kana matrices 50 and 60 were assumed. This should not rule out the fact that a plurality of such single-row channel matrices can be combined to form a block if necessary.
  • the middle plate 51 is simultaneously used as a cover plate for the upper and lower row of channels. If one thinks of this plate 51 again from a conductive material, this results in a common electrode for both the upper and the lower strips made of piezoelectric material.
  • FIG. 6 again shows in a schematic cross-sectional representation that two channel matrices 50 and 60 can be arranged tightly packed, for example to increase the resolution.
  • the middle plate 51 is simultaneously used as a cover plate for the upper and lower row of channels. If one thinks of this plate 51 again from a conductive material, this results in a common electrode for both the upper and the lower strips made of piezoelectric material.
  • Fig. 7 shows an ink channel 70 in longitudinal section.
  • a part of the piezoelectric material 73 can be seen in the right end region, which reduces the height of the outlet opening running transversely to the channel extension.
  • the ink channel 70 can thus have a larger volume without the size cross section of the drops changing.
  • FIG. 8 shows a write head 80 similar to that shown in FIG. 2, except that four channel matrices 81-84 are provided densely packed and also four separate storage chambers 85-88 for writing liquid of different colors. If you choose as colors, red, blue, yellow and black, you can use it to create perfect color records - controlled e.g. B. from a Standbilmonitor - be made.

Claims (12)

1. Tête d'écriture à commande piézoélectrique pour des dispositifs d'écriture à encre par points comportant des canaux d'adduction de l'encre faisant partie d'une matrice de canaux, qui reçoivent de l'encre et à partir desquels cette dernière est éjectée goutte-à-goutte par suite de la déformation piézoélectrique d'un organe de commande, caractérisée par le fait que la matrice de canaux (10 ; 40 ; 50 ; 60) est constituée par une série de bandes (20-27) réalisées en un matériau piézoélectrique, qui sont disposées parallèlement et à distance les unes des autres et délimitent de cette manière les canaux d'adduction d'encre (13-16 ; 44, 45 ; 52, 53, 61), qui sont raccordés par des contacts électriques au niveau de leurs deux faces et sont recouvertes, au niveau de leurs deux faces, par une plaque (17, 18 ; 48, 49).
2. Tête d'écriture suivant la revendication 1, caractérisée par le fait que l'épaisseur des bandes (20-27) et leur écartement mutuel sont choisis de manière que les canaux (13-16 ; 44, 45 ; 52, 53, 61), formée entre les bandes (20-27), forment eux- mêmes les buses d'écriture.
3. Tête d'écriture suivant la revendication 1 ou 2, caractérisée par le fait que seul un canal sur deux (13-16 ; 44, 45) est utilisé en tant que canal d'adduction d'encre et que les canaux intercalaires sont remplis par un matériau élastique ou par de l'air.
4. Tête d'écriture suivant l'une des revendications 1 à 3, caractérisée par le fait que la plaque (47) située sur une face des bandes piézoélectriques (20-27) est constituée en un métal et est utilisée en tant qu'électrode commune pour toutes les bandes (20-27).
5. Tête d'écriture suivant la revendication 4, caractérisée par le fait qu'au moins cette plaque (17) est suffisamment mince pour que la déformation des bandes piézoélectriques (20-27) ne provoque aucune courbure.
6. Tête d'écriture suivant l'une des revendications 1 à 5, caractérisée par le fait que les bandes piézoélectriques sont en outre munies de couches métalliques sur leur face supérieure.
7. Tête d'écriture suivant l'une des revendications 1-6, caractérisée par le fait que la hauteur des canaux d'adduction d'encre (70) diminue dans la zone de l'ouverture de sortie.
8. Procédé pour fabriquer une tête d'écriture suivant l'une des revendications 1 à 7, caractérisé par le fait qu'une plaque de support (17) comporte, sur sa surface, une couche conductrice en forme de bandes, qu'on dépose un matériau piézoélectrique en forme de bandes sur cette couche, qu'on établit un contact électrique par paires entre les bandes piézoélectriques (20-27) et qu'on dépose une plaque de revêtement (18) d'une manière isolée par rapport à ces bandes.
9. Procédé pour fabriquer une tête d'écriture suivant la revendication 8, caractérisé par le fait qu'il est prévu une plaque formant bilame, constituée en un matériau de support et en un matériau piézoélectrique et dans laquelle la structure en forme de bandes est produite par enlèvement, par zones, du matériau piézoélectrique par usinage.
10. Procédé suivant la revendication 8 ou 9. caractérisé par le fait que l'on prévoit un métal comme matériau de support.
11. Procédé pour fabriquer une tête d'écriture suivant l'une des revendications 1 à 7, caractérisé par le fait que l'on forme un produit stratifié formé par un matériau piézoélectrique (41) muni d'une couche métallique (42, 43) sur ses deux faces, qu'on élimine par usinage, du produit stratifié, des bandes s'étendant sur approximativement deux couches, une fois sur une face et une fois sur l'autre face, qu'on établit un contact électrique par paires entre les bandes subsistantes constituées par le matériau piézoélectrique et qu'on ferme, au moins sur une face, la plaque ainsi obtenue, à l'aide d'une plaque continue (48, 49) (figure 5).
12. Procédé pour fabriquer une tête d'écriture suivant la revendication 11, caractérisé par le fait que l'on aménage au moins une interruption dans le matériau piézoélectrique suivant la direction longitudinale des bandes devant être formées.
EP84101681A 1983-02-22 1984-02-17 Tête d'écriture à actionneurs piézo-électriques avec une matrice de canaux Expired EP0116971B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19833306098 DE3306098A1 (de) 1983-02-22 1983-02-22 Piezoelektrisch betriebener schreibkopf mit kanalmatrize
DE3306098 1983-02-22

Publications (2)

Publication Number Publication Date
EP0116971A1 EP0116971A1 (fr) 1984-08-29
EP0116971B1 true EP0116971B1 (fr) 1986-05-28

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EP84101681A Expired EP0116971B1 (fr) 1983-02-22 1984-02-17 Tête d'écriture à actionneurs piézo-électriques avec une matrice de canaux

Country Status (4)

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US (1) US4536097A (fr)
EP (1) EP0116971B1 (fr)
JP (1) JPS59159358A (fr)
DE (2) DE3306098A1 (fr)

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DE3306098A1 (de) 1984-08-23
JPH0448622B2 (fr) 1992-08-07
US4536097A (en) 1985-08-20
JPS59159358A (ja) 1984-09-08
DE3460162D1 (en) 1986-07-03
EP0116971A1 (fr) 1984-08-29

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