EP2905138B1 - Tintenstrahlkopf-ansteuerungsverfahren, tintenstrahlkopf-ansteuerungsvorrichtung und tintenstrahldruckvorrichtung - Google Patents

Tintenstrahlkopf-ansteuerungsverfahren, tintenstrahlkopf-ansteuerungsvorrichtung und tintenstrahldruckvorrichtung Download PDF

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Publication number
EP2905138B1
EP2905138B1 EP13843417.0A EP13843417A EP2905138B1 EP 2905138 B1 EP2905138 B1 EP 2905138B1 EP 13843417 A EP13843417 A EP 13843417A EP 2905138 B1 EP2905138 B1 EP 2905138B1
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EP
European Patent Office
Prior art keywords
driving
pressure chambers
rows
inkjet head
pressure
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Application number
EP13843417.0A
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English (en)
French (fr)
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EP2905138A1 (de
EP2905138A4 (de
Inventor
Ryohei Kobayashi
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Konica Minolta Inc
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Konica Minolta Inc
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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
    • B41J2/015—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
    • B41J2/04543—Block driving
    • 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
    • B41J2/04573—Timing; Delays
    • 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
    • B41J2/135—Nozzles
    • B41J2/14—Structure thereof only for on-demand ink jet heads
    • B41J2002/14459—Matrix arrangement of the pressure chambers

Definitions

  • the present invention relates to a driving method of an inkjet head, a driving apparatus of an inkjet head, and an inkjet recording apparatus and, more particularly, to a driving method of an inkjet head, a driving apparatus of an inkjet head, and an inkjet recording apparatus capable of reducing an effect of crosstalk on an inkjet head having two or more rows of pressure chambers communicating with each other through a common ink chamber.
  • the destabilization of the droplet speed due to the crosstalk occurs because a pressure wave generated in a pressure chamber at the time of ejection propagates from an inlet of the pressure chamber to a common ink chamber and affects another pressure chamber through the common ink chamber.
  • a pressure wave generated in a pressure chamber at the time of ejection propagates from an inlet of the pressure chamber to a common ink chamber and affects another pressure chamber through the common ink chamber.
  • the pressure wave propagates through the common ink chamber to the pressure chambers in another row of pressure chambers and, therefore, it is important to suppress crosstalk between the rows of the pressure chambers.
  • Patent Document 1 the common ink chamber is divided into two parts by a division wall along the rows of pressure chambers so as to prevent the pressure wave from propagating from one row of pressure chambers to the other row of pressure chambers.
  • Patent Document 2 It is described in Patent Document 2 that a wall surface of the common ink chamber facing the inlets of the pressure chambers is regulated to a predetermined bulk modulus or less to attenuate the pressure wave propagating into the common ink chamber, thereby reducing the crosstalk.
  • Patent Document 3 it is described in Patent Document 3 that a load of a driving circuit is suppressed by arranging nozzle rows with a nozzle pitch therebetween shifted from integer multiples of the minimum pixel pitch and by shifting a phase of a driving signal in accordance with the shift amount to make an adjustment such that a droplet from each nozzle row impacts at a lattice point of an image.
  • Patent Document 4 electric power saving is achieved by shifting a phase of a driving signal by a predetermined delay time to prevent peak values of a charging current charging, or a discharging current discharging, a piezoelectric element, from overlapping between channels.
  • This delay time is described as being equal to a rising time determined from an electrostatic capacity and a charging resistance of the piezoelectric element.
  • EP 163470581 discloses a line type inkjet recording apparatus wherein the actuators of ink chambers are activated at different timings within one printing cycle and the ink is ejected from each of the ink chambers The timings are determined based on the positional relationship between the ink chambers and based on the rigidity of the surroundings.
  • Patent Documents 1 and 2 have a problem that an inkjet head structure itself must be changed for reducing the crosstalk between rows of pressure chambers.
  • the division wall is disposed in the common ink chamber as in Patent Document 1
  • the head structure becomes complex, resulting in a problem of cost increase.
  • a division wall must additionally be disposed as the number of rows of pressure chambers increases, an ink supply system becomes complex, resulting in a problem of difficulty of handling of the head.
  • the present inventor found that the problems of the crosstalk and the driving load can solved at the same time by not only simply shifting the phase of the driving signal between the rows of pressure chambers for reducing the driving load but also applying a predetermined phase difference.
  • the purpose of the present invention is to provide a driving method of an inkjet head, a driving apparatus of an inkjet head, and an inkjet recording apparatus capable of reducing a crosstalk generated between multiple rows of pressure chambers communicating through a common ink chamber and a driving load at the same time without making any changes to head structure.
  • Fig. 1 is a general configuration diagram of an example of an inkjet recording apparatus according to the present invention.
  • a recording medium P is clamped by a feeding roller pair 201 of a feeding mechanism 200 and is fed in a Y-direction (vertical scanning diction) depicted in Fig. 1 by a feeding roller 203 rotationally driven by a feeding motor 202.
  • An inkjet head H is disposed between the feeding roller 203 and the feeding roller pair 201 to face a recording surface PS of the recording medium P.
  • the inkjet head H is mounted on a carriage 400 that is disposed along guide rails 300 placed over the recording medium P in the width direction thereof and that can be reciprocated by a driving means not depicted along a X-X' direction (horizontal scanning direction) depicted in Fig. 1 substantially orthogonal to the feeding direction (vertical scanning direction) of the recording medium P, such that a nozzle surface side is located facing the recording surface PS of the recording medium P, and as described in detail later, the inkjet head H is electrically connected via an FPC 4 to a driving apparatus 500.
  • the inkjet head H performs scanning movement for the recording surface PS of the recording medium P in the X-X' direction depicted in Fig. 1 and ejects droplets from nozzles in the course of this scanning movement to record a desired inkjet image.
  • FIG. 2 is an exploded perspective view of an inkjet head
  • Fig. 3 is a partial back view of a head chip thereof
  • Fig. 4 is a partial cross-sectional view of the head chip.
  • reference numerals 1, 2, 3, 4, and 5 denote a so-called harmonica type head chip, a nozzle plate, a wiring substrate, the FPC, and an ink manifold, respectively.
  • the head chip 1 forms a hexahedron shape and has two channel rows with pluralities of channels arranged.
  • a channel row on the lower side of Fig. 3 is referred to as a row A, and a channel row on the upper side is referred to as a row B.
  • the head chip 1 has driving channels 11 acting as pressure chambers to eject ink and dummy channels 12 without ejection of ink as channels and is a head chip of an independent driving type recording an image with ink ejected only from the driving channels 11.
  • a driving channel of the row A, a driving channel of the row B, a dummy channel of the row A, and a dummy channel of the row B may hereinafter be denoted by 11A, 11B, 12A, and 12B, respectively.
  • the respective channel rows have the driving channels 11A, 11B and the dummy channels 12A, 12B arranged alternately. Between the driving channel 11A or 11B and the dummy channel 12A or 12B, a partition wall 13 is formed that is a pressure applier made up of a piezoelectric element such a PZT.
  • a partition wall of the row A and a partition wall of the row B may hereinafter be denoted by 13A and 13B, respectively.
  • the driving channels 11A, 11B and the dummy channels 12A, 12B are opened in both a front end surface 1a and a back end surface 1b of the head chip 1 and respective driving electrodes 14 formed in close contact with the inner surfaces thereof.
  • the driving channels 11A, 11B and the dummy channels 12A, 12B have outlets and inlets opened in the front end surface 1a and the back end surface 1b, respectively, which are opposite end surfaces of the head chip 1, and are formed straight from the inlets to the outlets.
  • the "front surface” is the end surface on the side from which ink is ejected from the head chip 1 and the "back end surface” is the end surface on the opposite side.
  • connection electrodes 15A, 15B conducting to the driving electrodes 14 of the driving channels 11A, 11B and the dummy channels 12A, 12B.
  • One end of each of the connection electrodes 15A, 15B conducts to one of the driving electrodes 14 in the corresponding driving channels 11A, 11B or dummy channels 12A, 12B.
  • connection electrodes 15A corresponding to the driving channels 11A and the dummy channels 12A of the row A is formed from the inside of each of the channels 11A, 12A to one end edge 1c of the head chip 1, while the other end of each of the connection electrodes 15B corresponding to the driving channels 11B and the dummy channels 12B of the row B is formed to extend from the inside of each of the channels 11B, 12B toward the row A to a position before the channel row of the row A. Therefore, all the connection electrodes 15A, 15B extend from the channels 11A, 11B, 12A, and 12B in the same direction.
  • the nozzle plate 2 is bonded to the front end surface 1a of the head chip 1 by an adhesive.
  • the nozzle plate 2 has nozzles 21 opened only at positions corresponding to the driving channels 11A, 11B.
  • a wiring substrate 3 is a flat plate-shaped substrate larger than the back end surface 1b of the head chip 1 and, in a bonding region (region indicated by a dashed-dotted line in Fig. 2 ) 31 bonded to the back end surface 1b of the head chip 1, the wiring substrate 3 has through-holes 32A, 32B individually opened for supplying ink from a common ink chamber 51 in the ink manifold 5 into the driving channels 11A, 11B, only at the positions corresponding to the driving channels 11A, 11B opened in the back end surface 1b of the head chip 1.
  • the common ink chamber 51 is made up of an internal space of the box-shaped ink manifold 5 bonded on the back surface of the wiring substrate 3 (on the surface opposite to the head chip 1) so as to supply the ink through the through-holes 32A, 32B commonly to the driving channels 11A, 11B. Therefore, the driving channels 11A, 11B are in communication with each other through this common ink chamber 51. In contrast, the dummy channels 12A, 12B are blocked by the wiring substrate 3.
  • wiring electrodes 33A, 33B are formed by vapor deposition or sputtering and are electrically connected to the connection electrodes 15A, 15B arranged on the back end surface 1b of the head chip 1.
  • the wiring electrodes 33A, 33B extend on the surface of the wiring substrate 3 in the direction orthogonal to the channel rows of the head chip 1.
  • Each of the wiring electrodes 33A corresponding to the connection electrodes 15A led out from the channels 11A, 12A of the row A has one end located in the vicinity of each of the channels 11A, 12A of the row A in the bonding region 31 and the other end extending from the bonding region 31 in the direction orthogonal to the channel rows of the head chip 1 and reaching an end portion 3a of the wiring substrate 3.
  • each of the wiring electrodes 33B corresponding to the connection electrodes 15B led out from the channels 11B, 12B of the row B has one end located in the vicinity of each of the channels 11B, 12B of the row B in the bonding region 31 and the other end extending in the same direction as the wiring electrodes 33A and going between the adjacent through-holes 32A of the row A to the end portion 3a of the wiring substrate 3.
  • the wiring electrodes 33A and 33B are alternately arranged at the end portion 3a of the wiring substrate 3.
  • the wiring substrate 3 is attached to the back end surface 1b of the head chip 1 such that the connection electrodes 15A, 15B of the head chip 1 and the wiring electrodes 33A, 33B of the wiring substrate 3 are electrically connected in a corresponding manner, and is bonded by an adhesive with a predetermined pressing force (e.g., 1 MPa or more).
  • a predetermined pressing force e.g. 1 MPa or more.
  • an adhesive without conducting particles is preferably used partially because of certainly preventing a short circuit although an anisotropic conductive adhesive containing conducting particles can be used.
  • the inkjet head H is mounted on the carriage 400 of the inkjet recording apparatus 100 such that the row direction of the channel rows extends along the Y-direction of Fig. 1 , and is electrically connected via the FPC 4 to the driving apparatus 500 as depicted in Fig. 1 .
  • a driving signal corresponding to image data transmitted from a driving circuit in the driving apparatus 500 is applied via the FPC 4 to the driving electrode 14 of each of the driving channels 11, the shear deformation of the partition wall 13 occurs and changes the capacity of the driving channel 11, applying a pressure for ejection of the ink in the driving channel 11.
  • Fig. 5 depicts an example of the driving signal applied to the inkjet head H for ejecting the ink.
  • This driving signal is a rectangular wave formed by a positive voltage (+V) of a pulse width PW generating a negative pressure in a channel.
  • FIG. 6 depicts only one of the driving channels 11 and the two dummy channels 12 on both sides thereof in one of the channel rows of the inkjet head H and the two partition walls 13 therebetween.
  • the pulse width PW i.e., a duration time of the positive voltage of the driving signal
  • the pulse width PW is preferably set to near 1 AL at which the pressure in the driving channel 11 is inverted from negative to positive, or specifically, preferably set within a range from 0.8 AL or more to 1.2 Al or less.
  • AL (acoustic length) indicative of the duration time of the driving signal means 1/2 of an acoustic resonance period of a pressure wave in the channel 12.
  • AL is obtained by measuring a speed of a droplet ejected when the rectangular-wave driving single is applied to the driving electrode 14, as a pulse width at which a droplet flying speed is maximized when the pulse width PW of the rectangular wave is changed while a voltage value of the rectangular wave is kept constant.
  • a pulse is a rectangular wave at a constant voltage peak value and, when 0 V is 0 % and a peak-value voltage is 100 %, the pulse width PW is defined as a time between a 10 % rise from the voltage of 0 V and a 10 % fall from the peak-value voltage.
  • the rectangular wave refers to a waveform having both a rising time and a falling time between 10 % and 90 % of the voltage set within 1/2, preferably 1/4, of AL.
  • the driving apparatus 500 divides all the channel rows included in the inkjet head H into N driving groups.
  • N is an integer of two or more.
  • a driving group is a group on the basis of a channel row having the driving channels 11 to which the driving signal is applied at the same timing from the driving apparatus 500 within a driving period T of the inkjet head H. Therefore, the driving channels 11 and the dummy channels 12 in the same channel are included in the same driving group.
  • the driving channels 11 of the same driving group in the inkjet head H are all driven at the same time.
  • a phase difference of nAL+t is applied between a driving signal applied to the driving electrodes 14 of the driving channels 11 making up the driving group A and a driving signal applied to the driving electrodes 14 of the driving channels 11 making up the driving group B from the driving apparatus 500 to the inkjet head H.
  • This timing chart represents the case of applying the driving signal for each driving period T of the driving group A such that the driving group A is driven earlier than the driving group B.
  • n is an integer of one or more and that AL is 1/2 of the acoustic resonance period of the pressure wave in the driven channels 11 as described above.
  • t is a pressure wave transmission time obtained from "inter-nozzle distance between driving groups"/"speed of sound traveling through the ink".
  • the driving groups of the "inter-nozzle distance between driving groups" are two different driving groups to be driven with a phase difference in the present invention. If two channel rows are disposed as depicted in Fig. 7 , the inter-nozzle distance between the driving groups is a distance indicated by D in Fig. 7 .
  • the speed C of sound traveling through the ink can be calculated from the following equation.
  • C K / ⁇
  • K is the bulk modulus of the ink and ⁇ is the density of the ink.
  • the speed C is a characteristic value of the ink.
  • the droplet speed may significantly fluctuate due to the effect of crosstalk since the driving channels 11A, 11B of the driving groups A, B are in communication with each other through the common ink chamber 51.
  • the driving groups are driven to eject droplets first from, for example, the driving channels 11A of the driving group A and then eject droplets from the driving channels 11B of the driving group B after the elapse of a predetermined Delay time
  • the droplet speed of ejection from the driving channels 11B of the driving group B periodically varies to the positive and negative sides relative to the droplet speed of ejection from the driving channels 11A of the driving group A in accordance with the Delay time.
  • the droplet speed is repeatedly inverted to positive and negative for each AL, and the droplet speed from the driving channels 11B of the driving group B becomes substantially the same as the droplet speed from the driving channels 11A of the driving group A at the time of the inversion.
  • the present inventor found out that the period started after the elapse of the time t described above after the droplet ejection of the driving group A.
  • the droplet speed from the driving channels 11B of the driving group B becomes substantially the same as the droplet speed from the driving channels 11A of the driving group A performing the ejection first.
  • the driving apparatus 500, and the inkjet recording apparatus 100 including the driving apparatus 500 when the phase difference of nAL+t is applied to the driving signals applied to the respective driving groups A and B, the effect of the crosstalk between the driving groups A and B having the common ink chamber 51 in common can substantially be ignored without the need of making any changes to the head structure of the inkjet head H, and the fluctuation of the droplet speed between the channel rows can be suppressed. Moreover, since the phase difference is applied to the driving signals between the driving groups A and B, the driving load is also suppressed.
  • n may be any integer equal to or greater than one.
  • An inkjet head having a plurality of channel rows typically starts ejection at different temporal timing in advance for impact position adjustment because of a difference of physical nozzle positions between adjacent channel rows.
  • a first row e.g., the driving group A
  • the recording medium P and the inkjet head H moves relative to each other so that the nozzles 21 of a second row (the driving group B) arrive at the physical position where the nozzles 21 of the first row existed at the start of ejection, and the second row then starts ejection at this moment.
  • the driving channels 11 perform the ejection at the same driving timing and only the starting time and the ending time are different for each channel row.
  • the phase difference of nAL+t between the driving groups of the present invention is the Delay time not including a difference of the starting time and the ending time due to the impact position adjustment because of a difference of the physical nozzle positions between the driving groups as described above (an impact position adjustment period between the driving groups). Therefore, as depicted in Fig. 10 , the phase difference indicates the Delay time provided within a period of driving of both two driving groups that are objects of application of the phase difference, and the droplet ejection timing itself is varied by applying the phase difference of nAL+t to the driving signal application timing between the different driving groups A and B in the period of driving of the both driving groups.
  • the number of the channel rows is two in the above description, the number of the channel rows may be more than one in the present invention and the configuration as described above can be achieved by dividing a plurality of the channel rows into N driving groups (N is an integer of two or more).
  • Fig. 11 depicts the case of having four channel rows and, in this case, all the channel rows are divided into two driving groups A and B, and the dividing groups are grouped alternately in the order of A, B, A, B from the upper side of Fig. 11 such that the adjacent channel rows belong to different driving groups.
  • D' is preferably equivalent to D or made larger such that the pressure wave is sufficiently attenuated.
  • Fig. 13 depicts the case of having six channel rows and, in this case, all the channel rows are divided into three driving groups and the dividing groups are grouped alternately in the order of A, B, C, A, B, C from the upper side of Fig. 13 such that the adjacent channel rows belong to different driving groups.
  • D' is preferably equivalent to D or made larger such that the pressure wave is sufficiently attenuated.
  • the number of the divided groups is three or more as described above, it is preferable to set all the phase differences nAL+t between the driving groups to the same value in terms of avoidance of print speed reduction.
  • the channel rows are preferably divided such that the adjacent channel rows belong to different driving groups. Since at least one channel row belonging to a different driving group is disposed between the channel rows belonging to the same driving groups, a separation distance between the same driving groups is made larger and the effect of the crosstalk can be reduced between the same driving groups.
  • the channel rows of the inkjet head H may not all be driven by the common driving circuit in the driving apparatus 500, and two or more driving circuits may be included in the driving apparatus 500 so that the respective channel rows are driven by the two or more driving circuits.
  • the driving groups are preferably differentiated between the channel rows of the same driving circuit.
  • Fig. 15 depicts an example of four channel rows driven by two driving circuits 501, 502 each driving two rows in the driving apparatus 500.
  • the two channel rows driven by the driving circuit 501 are divided into the different groups A, B and the two channel rows driven by the driving circuit 502 are divided into the different groups A, B.
  • the lowering of the droplet speed can be reduced. This is because a decrease in the number of the driving channels driven by one driving circuit at the same time reduces the load of the driving circuits and the waveform rounding of the driving signals can be reduced.
  • the driving signal of the present invention is not limited thereto and may be any driving signal for ejecting a droplet.
  • a so-called harmonica type head forming a hexahedron shape with inlets and outlets of channels disposed on opposite end surfaces is exemplified as the head chip 1 of the inkjet head H. Since the inlets of the driving channels 11 are arranged on the same plane of the back end surface 1b in all the channel rows with the common ink chamber 51 disposed on the inlet side of the driving channels 11, the head chip 1 described above is relatively significantly affected by the crosstalk and likely to cause fluctuation of the droplet speed and is therefore in a preferable form since the remarkable effect is acquired from the application of the present invention.
  • the head chip structure of the present invention is not limited thereto and may be any structure in which pressure chambers are in communication with each other through a common ink chamber between multiple rows of pressure chambers.
  • the inkjet recording apparatus of the present invention is not limited to an apparatus ejecting droplets for recording in the course of the scanning movement of the inkjet head H in the width direction (horizontal scanning direction) over the recording medium P as described above and may be an apparatus having the inkjet head H made up of a line-shaped inkjet head fixed in the width direction over the recording medium P to eject droplets from the nozzles 21 for recording in the course of movement of the recording medium P in the Y-direction of Fig. 1 .
  • the channel rows of the inkjet head H is arranged in the X-X' direction of Fig. 1 .
  • An inkjet head having two channel rows with the structure same as the inkjet head depicted in Fig. 2 was prepared, and one channel row was defined as a driving group A while the other channel row was defined as a driving group B.
  • the two channel rows of the inkjet head are driven by the same driving circuit.
  • Ink used for this inkjet head had viscosity of 10 mPa ⁇ s and surface tension of 32 mN/m, and the speed of sound traveling through the ink was 1300 m/s.
  • a rectangular wave composed only of the positive voltage (+V) depicted in Fig. 5 was used.
  • the driving signals were applied from the common driving apparatus to all the channel rows.
  • the respective droplets ejected from the nozzles of the driving groups A, B were photographed by using a camera to calculate the droplet speed from the image processing of the acquired droplet images, and the average speed of the nozzles was obtained from the result for each of the channel rows. From the acquired average speeds,
  • was calculated, and the calculated value was used for obtaining a fluctuation rate to the average speed of the driving group A ( the calculated value/the average speed of the driving group A ⁇ 100; in %) to evaluate the effect of the crosstalk in accordance with the following criteria.
  • the result is described in Table 1.
  • An inkjet head was prepared such that the inkjet head has four nozzle rows as depicted in Fig. 11 , and all the channel rows were divided into two driving groups A, B such that the driving groups are differentiated between adjacent channel rows.
  • the four channel rows of the inkjet head are driven by two driving circuits as depicted in Fig. 15 .
  • Ink used for this inkjet head had viscosity of 5.7 mPa ⁇ s and surface tension of 41 mN/m, and the speed of sound traveling through the ink was 1600 m/s.
  • the driving signals were the same as Example 1.
  • the result is described in Table 2.

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

Claims (9)

  1. Steuerverfahren für einen Tintenstrahlkopf mit zwei oder mehr Reihen (A, B) von Druckkammern (11), bei denen ein Druck zum Ausstoßen von Tinte im Inneren aus einer Düse (21) durch einen Druckgeber erzeugt wird, der durch das Anwenden eines Treibersignals betätigt wird, wobei die Druckkammern (11) in den Reihen (A, B) der Druckkammern miteinander über eine gemeinsame Tintenkammer (51) in Verbindung stehen, wobei
    die Reihen (A, B) der Druckkammern in N Ansteuergruppen unterteilt sind, wobei N eine ganze Zahl gleich zwei oder größer ist,
    dadurch gekennzeichnet, dass
    eine Phasendifferenz nAL+t zwischen den
    unterschiedlichen Ansteuergruppen auf die Treibersignale angewendet wird, die auf die Druckgeber der Druckkammern (11) angewendet werden, wobei n eine ganze Zahl gleich eins oder größer ist, wobei AL gleich 1/2 einer akustischen Resonanzzeitspanne einer Druckwelle in der Druckkammer (11) ist, und wobei t eine Druckwellenübertragungszeit ist, die aus einem Zwischendüsenabstand zwischen den Ansteuergruppen / einer Geschwindigkeit des Schalls, der durch die Tinte läuft, erhalten wird.
  2. Steuerverfahren eines Tintenstrahlkopfs nach Anspruch 1, bei dem die Reihen (A, B) der Druckkammern benachbart zueinander sind, und die Reihen in unterschiedliche Ansteuergruppen unterteilt sind.
  3. Steuerverfahren für einen Tintenstrahlkopf nach Anspruch 1, bei dem die Reihen (A, B) durch zwei oder mehr Treiberschaltungen (501, 502) angetrieben werden, und wobei
    die Reihen (A, B) der Druckkammern der gleichen Treiberschaltung in unterschiedliche Ansteuergruppen unterteilt sind.
  4. Steuerverfahren für einen Tintenstrahlkopf nach Anspruch 1, 2 oder 3, bei dem der Tintenstrahlkopf ein Tintenstrahlkopf ist, der einen Kopfchip mit Einlässen und Auslässen der Druckkammern (11) hat, die sich zu unterschiedlichen Endoberflächen öffnen, so dass die Druckkammern (11) gerade von den Einlässen zu den Auslässen ausgebildet sind, und wobei die gemeinsame Tintenkammer (51) auf einer Einlassseite der Druckkammern (11) angeordnet ist.
  5. Ansteuerungsvorrichtung für einen Tintenstrahlkopf mit zwei oder mehr Reihen (A, B) von Druckkammern (11), bei denen ein Druck zum Ausstoßen von Tinte im Inneren aus einer Düse (21) durch einen Druckgeber erzeugt wird, der durch das Anwenden eines Treibersignals betätigt wird, wobei die Druckkammern (11) in den Reihen (A, B) der Druckkammern miteinander über eine gemeinsame Tintenkammer (51) in Verbindung stehen, wobei
    die Reihen (A, B) der Druckkammern in N Ansteuergruppen unterteilt sind, wobei N eine ganze Zahl gleich zwei oder größer ist,
    dadurch gekennzeichnet, dass
    eine Phasendifferenz nAL+t zwischen den unterschiedlichen Ansteuergruppen auf die Treibersignale angewendet wird, die auf die Druckgeber der Druckkammern (11) angewendet werden, wobei n eine ganze Zahl gleich eins oder größer ist, wobei AL gleich 1/2 einer akustischen Resonanzzeitspanne einer Druckwelle in der Druckkammer (11) ist, und wobei t eine Druckwellenübertragungszeit ist, die aus einem Zwischendüsenabstand zwischen den Ansteuergruppen / einer Geschwindigkeit des Schalls, der durch die Tinte läuft, erhalten wird.
  6. Ansteuerungsvorrichtung für einen Tintenstrahlkopf nach Anspruch 5, bei dem die Reihen (A, B) der Druckkammern benachbart zueinander sind, und wobei die Reihen (A, B) in unterschiedliche Ansteuergruppen unterteilt sind.
  7. Ansteuerungsvorrichtung für einen Tintenstrahlkopf nach Anspruch 5, bei dem
    die Ansteuerungsvorrichtung für einen Tintenstrahlkopf zwei oder mehr Treiberschaltungen (501, 502) hat, die die Reihen der Druckkammern (11) treiben, und wobei
    die Reihen (A, B) der Druckkammern der gleichen Treiberschaltung (501, 502) in unterschiedliche Ansteuergruppen unterteilt sind.
  8. Ansteuerungsvorrichtung für einen Tintenstrahlkopf nach Anspruch 5, 6 oder 7, bei dem der Tintenstrahlkopf ein Tintenstrahlkopf ist, der einen Kopfchip mit Einlässen und Auslässen der Druckkammern (11) hat, die sich zu unterschiedlichen Endoberflächen öffnen, so dass die Druckkammern (11) gerade von den Einlässen zu den Auslässen ausgebildet sind, und wobei die gemeinsame Tintenkammer (51) auf einer Einlassseite der Druckkammern (11) angeordnet ist..
  9. Tintenstrahlaufzeichnungsvorrichtung mit:
    einem Tintenstrahlkopf mit zwei oder mehr Reihen (A, B) von Druckkammern (11), bei denen ein Druck zum Ausstoßen von Tinte im Inneren aus einer Düse (21) durch einen Druckgeber erzeugt wird, der durch das Anwenden eines Treibersignals betätigt wird, wobei die Druckkammern (11) in den Reihen (A, B) der Druckkammern miteinander über eine gemeinsame Tintenkammer (51) in Verbindung stehen, und
    einer Ansteuerungsvorrichtung für einen Tintenstrahlkopf nach einem der Ansprüche 5 bis 8.
EP13843417.0A 2012-10-02 2013-10-01 Tintenstrahlkopf-ansteuerungsverfahren, tintenstrahlkopf-ansteuerungsvorrichtung und tintenstrahldruckvorrichtung Active EP2905138B1 (de)

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JP6451409B2 (ja) * 2015-03-04 2019-01-16 セイコーエプソン株式会社 液体吐出装置、および、液体吐出装置の制御方法
JP6834343B2 (ja) * 2015-12-08 2021-02-24 株式会社リコー 液体を吐出する装置
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JP6202002B2 (ja) 2017-09-27
JPWO2014054655A1 (ja) 2016-08-25
EP2905138A4 (de) 2016-12-21

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