EP1036660B1 - Piezobiegewandler Drop-on-Demand Druckkopf sowie Verfahren zu dessen Ansteuerung - Google Patents

Piezobiegewandler Drop-on-Demand Druckkopf sowie Verfahren zu dessen Ansteuerung Download PDF

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Publication number
EP1036660B1
EP1036660B1 EP00105211A EP00105211A EP1036660B1 EP 1036660 B1 EP1036660 B1 EP 1036660B1 EP 00105211 A EP00105211 A EP 00105211A EP 00105211 A EP00105211 A EP 00105211A EP 1036660 B1 EP1036660 B1 EP 1036660B1
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EP
European Patent Office
Prior art keywords
piezo
piezo bending
transducers
bending transducer
transducer
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
EP00105211A
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German (de)
English (en)
French (fr)
Other versions
EP1036660A1 (de
Inventor
Joachim Professor Dr.-Ing. Heinzl
Ingo Dr. Ederer
Hermann Dipl.-Ing. Seitz
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.)
XYZ Computerdrucker GmbH
Original Assignee
Tally Computerdrucker GmbH
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 Tally Computerdrucker GmbH filed Critical Tally Computerdrucker GmbH
Publication of EP1036660A1 publication Critical patent/EP1036660A1/de
Application granted granted Critical
Publication of EP1036660B1 publication Critical patent/EP1036660B1/de
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
    • B41J2/015—Ink jet characterised by the jet generation process
    • B41J2/04—Ink jet characterised by the jet generation process generating single droplets or particles on demand
    • B41J2/045—Ink jet characterised by the jet generation process generating single droplets or particles on demand by pressure, e.g. electromechanical transducers
    • B41J2/04501—Control methods or devices therefor, e.g. driver circuits, control circuits
    • B41J2/04525—Control methods or devices therefor, e.g. driver circuits, control circuits reducing occurrence of cross talk
    • 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
    • B41J2/015—Ink jet characterised by the jet generation process
    • B41J2/04—Ink jet characterised by the jet generation process generating single droplets or particles on demand
    • B41J2/045—Ink jet characterised by the jet generation process generating single droplets or particles on demand by pressure, e.g. electromechanical transducers
    • B41J2/04501—Control methods or devices therefor, e.g. driver circuits, control circuits
    • B41J2/04581—Control methods or devices therefor, e.g. driver circuits, control circuits controlling heads based on piezoelectric elements
    • 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
    • B41J2/015—Ink jet characterised by the jet generation process
    • B41J2/04—Ink jet characterised by the jet generation process generating single droplets or particles on demand
    • B41J2/045—Ink jet characterised by the jet generation process generating single droplets or particles on demand by pressure, e.g. electromechanical transducers
    • B41J2/04501—Control methods or devices therefor, e.g. driver circuits, control circuits
    • B41J2/04596—Non-ejecting pulses
    • 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
    • B41J2002/14354—Sensor in each pressure chamber

Definitions

  • the invention relates to a method for driving a piezo print head and a piezo print head controlled by this method.
  • a conventional piezo bending transducer drop-on-demand printhead is e.g. from DE2527647A, DE3114259A and JP 01-271 248 A known.
  • a nozzle plate is a series of perpendicular to the plate plane Nozzles provided.
  • Piezo bending transducers are parallel to the nozzle plate in the form of an elongated tongue clamped on one side, so-called piezo-tongue transducers, arranged in a row next to each other in parallel so that their not clamped free ends each face one of the nozzles.
  • Piezo bending transducer has one parallel to the nozzle plate or perpendicular to the nozzles extending bending axis.
  • the piezo tongue is pushed through Applying a voltage bent so that the free end is away from the associated one Nozzle moved away.
  • the voltage is switched off and the free end snaps to the Nozzle and squeezes an amount of liquid through the nozzle, causing a drop to be expelled becomes.
  • the nozzles must be arranged very close to each other become.
  • the piezo bending transducers if possible, cover the entire assigned nozzle with its width. With a narrow nozzle arrangement, the mutually adjacent piezo bending transducers are therefore located as well as the nozzles assigned to them very close together.
  • the actuation of a As a result, the piezo bending transducer also has a fluid flow through the neighboring ones Nozzles associated with piezo bending transducers (crosstalk). Thereby a portion of the generated flow energy does not belong to the drop to be printed.
  • JP02024143 A shows a method and a piezo print head according to the preambles of the claims 1, 9, 15 and 16.
  • DE 691 19 088 T2 describes an operating method for a multichannel device for precipitation known from droplets.
  • a field of parallel channels provided with nozzles, which are uniformly spaced by channel-separating side walls, wherein the side walls have a wall compliance.
  • For ejecting a drop become the side walls separating the channel from the two adjacent channels deformed by the piezoelectric shear effect. This narrows the channel, and a drop is expelled.
  • the neighboring channels are widened which causes the liquid pressure to drop there. With a strong trigger pulse there is a risk that in the nozzles of the adjacent channels the meniscus is withdrawn so far that air can enter. This increases the strength of the drop output and the thus limited achievable flight speed of the drop. Adjacent nozzles can therefore not be controlled at the same time as droplet ejection.
  • EP 752312A shows a printhead with piezo elements from neighbors Ink chambers to be charged for compensation.
  • the invention is based on the problem of a method for driving a piezo print head of the type mentioned at the outset, which prevents crosstalk and to specify a piezo print head that can be controlled by this method, which can be produced with little manufacturing and assembly effort.
  • the object is achieved by a method with the features according to to claims 1 and 9 and by a piezo print head with the features claims 15 and 16, respectively.
  • Preferred embodiments are characterized in the subclaims.
  • the deflection of the adjacent piezo bending transducer by the compensation pulse causes a fluid movement locally at the nozzle assigned to the adjacent piezo bending transducer.
  • This fluid movement counteracts the fluid movement which occurs as a result of the triggering pulse and the movement of the triggered piezo bending transducer directly at the nozzle assigned to the adjacent piezo bending transducer.
  • the fluid movements compensate one another in whole or in part. A drop ejection does not occur at the nozzle (neighboring nozzle) assigned to the neighboring piezo bending transducer. Falsification of the printed image is prevented. The adverse effects of crosstalk are thus eliminated.
  • adjacent piezo bending transducers can be arranged so closely next to one another as the nozzle width allows. It can therefore be a printhead with a very high resolution can be achieved.
  • the narrow gap between the piezo bending transducer and the conventionally provided Partitions are eliminated.
  • a pull-out or reset movement of the piezo bending transducer can thus the flow of hydraulic fluid past the side the piezo bending transducer faster.
  • Another drop of droplet is thus shorter temporal distance to the previous one possible.
  • the print frequency can be increased become.
  • the piezo bending transducers can be acted upon by triggering pulses, which are a deflection of the piezo bending transducer to the assigned nozzle.
  • triggering pulses which are a deflection of the piezo bending transducer to the assigned nozzle.
  • the actual drop ejection movement of the piezo bending transducer then consists in the snap-back of the piezo structure due to the action of the trigger pulse and the associated Deflection built-up mechanical tension. Such a backward movement is generally faster than the deflection movement.
  • the neighboring piezo bending transducers with the closing control pulse are preferred assigned trigger pulse temporally preceding or simultaneously. To this ensures that the foreclosure is inserted when the droplets are expelled Movement of the piezo bending transducer with the trigger pulse already has occurred.
  • the adjacent piezo bending transducers can be acted upon by a closing control pulse whose amplitude is close to that of a trigger pulse. To be favoured it is subjected to a closing control pulse of an amplitude which is at most one Sixth of the amplitude of the trigger pulse is.
  • a closing control pulse of an amplitude which is at most one Sixth of the amplitude of the trigger pulse is.
  • This enables the use of Piezo bending transducers of two-pole type, i.e. Piezo-bimorph with passive position or monomorph. Since the trigger pulse usually moves the piezo bending transducer away from the nozzle deflects, the trigger pulse and the closing control pulse face each other. Bipolar Piezo bending transducers can actually only work in one direction, namely theirs Preferred direction are deflected. With a low amplitude it is also with two-pole Piezo bending transducers can be deflected against the preferred direction.
  • the compensation pulse is individual to the individual Piezo bending transducers adapted. In this way, even with existing manufacturing inaccuracies uniform droplet ejection at all nozzles or piezo bending transducers be ensured. If the trimming process is not just with individual Trigger pulses but with pulse combinations, i.e. triggering several at the same time Piezo bending transducer can be carried out in different constellations interactions of manufacturing or material inaccuracies of several piezo bending transducers Be taken into account.
  • the measurements can be made as part of the trimming process using one of the piezo bending transducers independent device.
  • the piezo bending transducers are preferred at the trimming process uses the piezo bending transducers as sensors by those resulting from the triggering of a piezo bending transducer, the ones caused thereby Fluid movement and the deflection of the neighboring piezo bending transducer induced in this are measured and to optimize the drop ejection or crosstalk behavior be evaluated. This means that no additional equipment is required and thus determine the crosstalk behavior at low cost. In that effects crosstalk behavior can be particularly noticeable in the printhead itself can be determined exactly.
  • the piezo bending transducers adjacent to the triggered piezo bending transducers are preferred during operation with compensation pulses or closing control pulses applied, determined for the amplitude, duration and / or time delay are caused by voltages caused by the triggering of a piezo bending transducer, the thereby causing fluid movement and the deflection of the neighboring piezo bending transducers can be induced, measured and processed in these. So one serves Adjacent piezo bending transducer after applying a trigger pulse initially as a sensor. The recorded data are evaluated and amplitude, duration and / or Time delay of the optimal compensation pulse are determined.
  • the serves Adjacent piezo bending transducers as an actuator and after the determined time delay the trigger pulse is the corresponding compensation pulse to the neighboring piezo bending transducer created. Interactions between the data recorded on several piezo bending transducers are taken into account. Likewise can be taken into account which piezo bending transducers act simultaneously become.
  • Such an adjustment of the pulses during operation can, in addition to the irregularities of droplet emissions caused by manufacturing and material inaccuracies are irregularities in droplet discharge caused by other factors can be compensated by adjusting the pulses.
  • Differences in the temperature conditions are taken into account.
  • irregularities the initial fluid-mechanical conditions at the start of the trigger pulse can be compensated, such as a residual flow due to the previous drop ejection.
  • vibrations can also be compensated.
  • the integrated in the company Aligning the pulses thus leads to a significant improvement in the printing result, in particular, to a large extent independence of the print result from external influences.
  • the ongoing adjustment when operating the piezo bending transducer drop-on-demand printhead can according to the invention instead of trimming or in addition to trimming before commissioning respectively.
  • the control device is suitably designed, e.g. as a computer with a corresponding control software.
  • the control device is preferably integrated Circuit trained.
  • the piezo bending transducers can e.g. than stretched out at both ends Piezo strips can be formed (piezo bridge transducers).
  • the piezo bending transducers are preferred designed as elongated tongues clamped on one side (piezo-tongue transducer).
  • the piezo-tongue transducers are further preferred Nozzles arranged in the area of the free ends of the piezo-tongue transducers.
  • the piezo bending transducers can be used as monomorphs, as bimorphs, each with a passive one Layer, as bimorphs with two active layers each, or as trimorphs. Further you can use the longitudinal effect of the piezoceramic or the transverse effect of the piezoceramic be exploited. You can use it as a single-layer converter or as a multi-layer converter be constructed.
  • the piezo bending transducers are preferred as bimorphs with two active layers or as Trimorphen formed and the control device is designed so that the neighboring Piezo bending transducers can be deflected in the opposite direction as that triggered piezo bending transducer by the other active position of the piezo transducer is applied with the compensation pulse.
  • This increases the risk of destruction of the piezo bending transducer switched off. This would exist if the deflection of the neighboring one Piezo bending transducer in the opposite direction by applying one opposite polarized voltage to the same position of a monomorph would. Contrary to the polarization direction, a piezoceramic can only with approx. 10% of the Maximum voltage can be applied.
  • the nozzles can be arranged so that the nozzle axis is parallel to the longitudinal direction of the piezo bending transducer and the nozzle in the extension of the piezo bending transducer is arranged (edge shooter).
  • the nozzles can also be arranged such that the nozzle axis is perpendicular to the Longitudinal direction of the piezo bending transducer and perpendicular to its bending axis and the nozzle is arranged in the region of the free end of the piezo bending transducer (sideshooter).
  • the piezo print head preferably has at least three-pole piezo bending transducers each two piezoceramic layers, and from the control device the trigger pulses to one piezoceramic layer and the closing control pulses to the other piezoceramic layer of the piezo bending transducer. In this way it is achieved that too the closing control pulse can have a larger amplitude without the risk a destruction of the piezo bending transducer, as is the case with a monomorph would be the case.
  • Patterns of pulses in which not only one is triggered can also be provided Piezo bending transducer immediately adjacent piezo bending transducer, but also the next but one or the next but one piezo bending transducer with compensation pulses, Closing control pulses or modified trigger pulses are applied.
  • FIGS. 1a to 1e The principle of the method according to the invention can be seen from FIGS. 1a to 1e.
  • Each of the figures shows schematically a section of a piezo bending transducer drop-on-demand Printhead.
  • a nozzle plate 1 In a nozzle plate 1 are three in a row perpendicular to the plane of the plate extending nozzles 11 are provided.
  • Parallel to the nozzle plate 1 are three piezo bending transducers 2 arranged in a row in parallel next to each other so that their not clamped free ends 21 each face one of the nozzles 11.
  • Piezo-bending transducer 2 is parallel to the nozzle plate 1 or perpendicular to the Nozzles 11 extending bending axis bendable.
  • the position of the three piezo bending transducers 2 is in a different one from each of FIGS. 1a to 1e Stage of the sequence of movements can be seen, which takes place when the middle of the three piezo bending transducers 2 is acted upon by a trigger pulse.
  • Figure 1b is the middle piezo bending transducer 2 due to the action of the trigger pulse in the deflection movement, so that its free end 21 from the associated nozzle 11 is moved away (see arrow).
  • Figure 1d are the two outer piezo bending transducers 2 with the compensation pulse acted upon and are consequently deflected so that their free ends 21 of the associated nozzles 11 are moved away (see arrows), while the middle Piezo bending transducer 2 continues to snap back due to the mechanical stresses, see above that its free end 21 is moved towards the associated nozzle 11 (see arrow).
  • the from the middle piezo bending transducer 2 to those assigned to the outer piezo bending transducers 2 Nozzles 11 displaced liquid is due to the deflection movements the outer piezo bending transducer 2 is sucked away from the associated nozzles 11 and does not emerge from the nozzles 11. There is therefore no falsification of the printed image.
  • the compensation pulses are also completed or in the decaying Phase and the outer piezo bending transducers 2 snap due to the mechanical stresses back so that their free ends 21 move toward the associated nozzles 11 be (see arrow).
  • the lower amplitude of the compensation pulses or one suitable decay edge leads to the backward movement of the outer piezo bending transducers 2 not to overcome the surface tension on the assigned Nozzles 11 and thus not to a drop.
  • a print head with actuators made of piezoceramic is used.
  • a piezo bending transducer 2 has a length of 5 mm, a height of 0.32 mm and a width of 0.4 mm. The free length is 3.2 mm.
  • the nozzle plate is made of silicon and has a thickness of 400 ⁇ m.
  • the nozzle diameter is 60 ⁇ m.
  • the nozzle channel length is 380 ⁇ m.
  • the Distance between the slats, i.e. the piezo bending transducer at rest, and the Nozzle plate is 20 ⁇ m. Diethyl succinate is used as the test medium for printing.
  • FIGS. 2a to 2d show the principle of the method according to the invention alternative embodiment can be seen.
  • Each of the figures shows a schematic section of a piezo bending transducer drop-on-demand printhead.
  • a nozzle plate 1 three nozzles 11 running perpendicular to the plate plane are provided in a row.
  • Parallel to the nozzle plate 1 are three piezo bending transducers 2 in a row parallel to each other arranged such that their unclamped free ends 21 each one of the Face nozzles 11.
  • Each of the piezo bending transducers 2 is parallel to or perpendicular to the nozzle plate 1 bending axis extending to the nozzles 11 bendable.
  • the position of the three piezo bending transducers 2 is in one from each of FIGS. 2a to 2d another stage of the sequence of movements that occurs when the middle of the three Piezo bending transducer 2 is acted upon by a trigger pulse.
  • Figure 2b is the middle piezo bending transducer 2 due to the action of the trigger pulse in the deflection movement, so that its free end 21 from the associated Nozzle 11 is moved away (see arrow).
  • the two outer piezo bending transducers 2 acted upon by the closing control pulse and are deflected as a result, so that their free ends 21 move toward the respectively assigned nozzles 11 be (see arrows).
  • the two outer piezo bending transducers 2 become so far the associated nozzles 11 moves that the nozzles 11 against the pressure fluid Filled liquid chamber completely or partially partitioned off by fluid mechanics become.
  • the middle piezo bending transducer 2 is due to the deflection in the The mechanical stresses built up in the structure completely jumped back into their starting position.
  • the two outer piezo bending transducers 2 are no longer used the closing control pulse and are consequently also due to the Deflect mechanical stresses built up in the structure entirely in their Starting positions jumped back.
  • FIG. 1 The structure of a piezo bending transducer according to the invention is shown schematically in FIG Drop-on-demand print head visible.
  • the nozzle plate 1 and the piezo bending transducers 2 corresponds to the structure of the representation according to FIGS. 1a to 1e, with more Nozzles 11 and piezo bending transducers 2 are shown.
  • Each of the piezo bending transducers 2 is connected to a control device 3 via a signal line 4.
  • the control device 3 is designed in such a way that with each Trigger pulse delayed compensation pulses to the triggered piezo bending transducer 2 neighboring piezo bending transducers 2 are delivered. This is with the Arrows along the signal lines 4 indicated.
  • the control device 3 is integrated Circuit trained.
  • Piezo bending transducers drop-on-demand printhead are provided. All shown Piezo bending transducers 2 are each in side view with the clamped end shown on the left. The axis around which the piezo bending transducer 2 is bent is perpendicular to the plane of the drawing.
  • a piezo bimorph with a passive position can be seen from FIG. 4a.
  • the piezo bending transducer 2 consists of two layers of piezoceramic, an active layer 22 and a passive one Layer 23.
  • a voltage U is only applied to the active layer 22, so that its length is changed. Since the length of the passive layer 23 remains constant, one occurs Bending the piezo bending transducer 2.
  • a piezo monomorph can be seen in FIG. 4b, in which the passive layer 23 is represented by a Layer 24 not made of piezoceramic is replaced.
  • FIG. 4c shows a piezo bimorph in which two active layers 22 are present are. These are oppositely polarized and are oppositely polarized Voltage U is applied, so that one layer shortens and the other lengthens.
  • FIG. 4d shows a piezo trimorph in which two active layers 22 are present are between which a layer 24 not made of piezoceramic is arranged. Such a structure enables greater deflections with the same voltage U.
  • FIG. 5a shows a structure in which the cross-effect of the piezoceramic is used becomes.
  • the polarization of the piezoceramic is perpendicular to the layers.
  • a positive voltage U applied along this polarization causes an expansion of the Material in the direction of polarization. Because of the mechanical cross contraction at the same time a contraction in the longitudinal direction of the piezo bending transducer 2, which because of the rigid other layer leads to the bend.
  • FIG. 5b shows a structure in which the longitudinal effect of the piezoceramic is used becomes.
  • the polarization of the piezoceramic runs in the longitudinal direction of the piezo bending transducer 2.
  • a positive voltage applied along this polarization causes an expansion of the material in the direction of polarization. Because of the rigid other layer it comes for bending the piezo bending transducer 2.
  • a multilayer structure of a piezoceramic layer can be seen from FIG. Instead of one uniformly polarized and with contacts at the two opposite ends Several layers are provided, each alternating with the opposite Polarization are provided. Between the layers are alternating the positive or negative contacts. In this way a large longitudinal effect of the piezoceramic is achieved with a small size.
  • FIGS. 4a to 4d with a longitudinal effect according to FIG 5a, possibly a multilayer structure according to FIG. 6, or with a transverse effect according to FIG. 5b can be used for used the piezo bending transducer of the piezo bending transducer drop-on-demand printhead become.
  • the bimorph-piezo bending transducer 2 is made of layers of piezoceramic over its entire thickness built up. Adjacent layers are each with opposite polarization Mistake.
  • Contact foils 26 are arranged between the layers. each second of the contact foils 26 is at one end of the piezo bending transducer 2 to one Earth contact bridge connected.
  • the ground contact bridge is on the ground contact 27 connected to the top of the piezo bending transducer 2 at a distance is arranged to the other end of the piezo bending transducer 2.
  • the ground contact 27 is connected to the control device 3 (not shown here) via a signal line 4.
  • the remaining contact foils 26 are assigned to the two active layers 22.
  • these contact foils 26 are attached to one another End of the piezo bending transducer 2 extending contact bridge connected to one first signal contact 28 is connected to the top of the piezo bending transducer 2 is arranged near the other end of the piezo bending transducer 2.
  • the first signal contact 27 is connected to the control device 3 (not shown here) via a signal line 4.
  • these contact foils 26 are attached to one at the other end of the piezo bending transducer 2 further contact bridge connected, which is connected to a second signal contact 29, the bottom of the piezo bending transducer 2 near the other end of the piezo bending transducer 2 is arranged.
  • the second signal contact 29 is via a signal line 4 to the control device 3 (not shown here) connected.
  • first signal contact 28 and second signal contact 29 can be seen.
  • the ground contact 27 and the first signal contact 28 both on the top of the piezo bending transducer 2 are arranged and isolated from each other.
  • FIG. 9 shows the time profile of the one directly on the piezoceramic applied voltage during the deflection phase, during the rebound phase of the piezo bending transducer and during the subsequent phase of Swinging out of the piezo bending transducer can be seen.
  • FIG. 10b shows a schematic structure and arrangement of one used in accordance with the invention Piezo bridge transducer can be seen.

Landscapes

  • Particle Formation And Scattering Control In Inkjet Printers (AREA)
EP00105211A 1999-03-15 2000-03-13 Piezobiegewandler Drop-on-Demand Druckkopf sowie Verfahren zu dessen Ansteuerung Expired - Lifetime EP1036660B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19911399A DE19911399C2 (de) 1999-03-15 1999-03-15 Verfahren zum Ansteuern eines Piezo-Druckkopfes und nach diesem Verfahren angesteuerter Piezo-Druckkopf
DE19911399 1999-03-15

Publications (2)

Publication Number Publication Date
EP1036660A1 EP1036660A1 (de) 2000-09-20
EP1036660B1 true EP1036660B1 (de) 2002-08-28

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EP00105211A Expired - Lifetime EP1036660B1 (de) 1999-03-15 2000-03-13 Piezobiegewandler Drop-on-Demand Druckkopf sowie Verfahren zu dessen Ansteuerung

Country Status (5)

Country Link
US (1) US6460979B1 (zh)
EP (1) EP1036660B1 (zh)
JP (1) JP2000296619A (zh)
CN (1) CN1182962C (zh)
DE (1) DE19911399C2 (zh)

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US7625053B2 (en) 2005-03-29 2009-12-01 Toshiba Tec Kabushiki Kaisha Ink jet recording apparatus

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CN1182962C (zh) 2005-01-05
DE19911399A1 (de) 2000-09-28
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