WO2012086360A1 - Dispositif d'impression - Google Patents

Dispositif d'impression Download PDF

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Publication number
WO2012086360A1
WO2012086360A1 PCT/JP2011/077044 JP2011077044W WO2012086360A1 WO 2012086360 A1 WO2012086360 A1 WO 2012086360A1 JP 2011077044 W JP2011077044 W JP 2011077044W WO 2012086360 A1 WO2012086360 A1 WO 2012086360A1
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WO
WIPO (PCT)
Prior art keywords
discharge
liquid
pressurizing
holes
pressurizing chamber
Prior art date
Application number
PCT/JP2011/077044
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English (en)
Japanese (ja)
Inventor
和也 芳村
Original Assignee
京セラ株式会社
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 京セラ株式会社 filed Critical 京セラ株式会社
Publication of WO2012086360A1 publication Critical patent/WO2012086360A1/fr

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    • 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
    • B41J2/04573—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
    • B41J2/145—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
    • 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
    • B41J2002/14217—Multi layer finger type piezoelectric element
    • 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
    • B41J2002/14225—Finger type piezoelectric element on only one side of the chamber
    • 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 recording apparatus that prints an image by discharging droplets.
  • printing apparatuses using inkjet recording methods such as inkjet printers and inkjet plotters are not only printers for general consumers, but also, for example, formation of electronic circuits, manufacture of color filters for liquid crystal displays, manufacture of organic EL displays It is also widely used for industrial applications.
  • a liquid discharge head for discharging liquid is mounted as a print head.
  • This type of print head includes a heater as a pressurizing unit in an ink flow path filled with ink, heats and boiles the ink with the heater, pressurizes the ink with bubbles generated in the ink flow path,
  • a thermal head system that ejects ink as droplets from the ink ejection holes, and a part of the wall of the ink channel filled with ink is bent and displaced by a displacement element, and the ink in the ink channel is mechanically pressurized, and the ink
  • a piezoelectric method for discharging liquid droplets from discharge holes is generally known.
  • a serial type that performs recording while moving the liquid discharge head in a direction (main scanning direction) orthogonal to the conveyance direction (sub-scanning direction) of the recording medium, and main scanning from the recording medium
  • a line type in which recording is performed on a recording medium conveyed in the sub-scanning direction with a liquid discharge head that is long in the direction fixed.
  • the line type has the advantage that high-speed recording is possible because there is no need to move the liquid discharge head as in the serial type.
  • the liquid discharge head has discharge holes connecting the manifold and the manifold via a plurality of pressurization chambers, respectively, and the plurality of pressurization chambers are arranged in a matrix and opened, and a metal flow path member,
  • a structure in which a piezoelectric actuator substrate having a plurality of displacement elements provided so as to cover each of the pressurizing chambers is laminated is known (see, for example, Patent Document 1).
  • the pressurizing chambers connected to the plurality of ejection holes are arranged in a matrix, and the displacement elements of the piezoelectric actuator substrate provided so as to cover the chambers are displaced by deformation of the piezoelectric body.
  • the displacement element includes a diaphragm, a common electrode, a piezoelectric ceramic layer, an individual electrode main body at a position facing the pressurizing chamber, and an extraction electrode that is drawn from the individual electrode main body and connected to the external wiring from the flow path member side It has the structure where the individual electrode which consists of was laminated
  • the amount of liquid that can be landed as one pixel on a recording medium by one drive signal from one discharge hole is small, and an image or the like is preferable. In some cases, recording could not be performed.
  • the drive signal for driving the pressurizing unit that pressurizes the liquid in the pressurizing chamber is delayed and sent.
  • the method of giving the delay is not properly controlled, one pixel is formed on the recording medium with droplets ejected from different ejection holes, and good recording can be obtained. There is a risk of not. For example, droplets ejected with a delayed drive signal are ejected after ejection with a non-delayed drive signal, so the influence is less than when sending a drive signal at the same time.
  • the liquid is ejected by the influence of the ejection by the drive signal that is not delayed, so the amount of the liquid ejected by the delayed drive signal is smaller than the amount of the liquid ejected by the drive signal that is not delayed.
  • the pixels that have landed with the liquid ejected by the delayed drive signal are smaller than the pixels that have landed the liquid ejected by the non-delayed drive signal. In order to reduce such an influence, it is necessary to control whether or not to give a delay to the drive signal when ejecting so as to be one pixel.
  • an object of the present invention is to control a part of the drive signal to be delayed and sent to the pressurizing unit, and to form one pixel on the recording medium with droplets ejected from a plurality of ejection holes.
  • Another object of the present invention is to provide a recording apparatus in which printing variations are not noticeable.
  • the recording apparatus of the present invention includes a plurality of discharge holes, a plurality of pressurization chambers connected to the plurality of discharge holes, and a plurality of pressurization units that respectively pressurize liquids in the plurality of pressurization chambers.
  • the plurality of discharge holes constitute a plurality of discharge hole groups arranged at equal intervals in the first direction and not arranged in a second direction orthogonal to the first direction.
  • the liquid ejecting head includes a transport unit that relatively moves the liquid discharge head in the second direction, and a control unit that controls the liquid discharge head and the transport unit.
  • a drive signal is sent with a delay so as not to send a drive signal to the pressurizing unit corresponding to the pressure chamber at the same time, and the liquid discharged from the discharge holes arranged in the second direction on the recording medium.
  • the liquid ejected by the delayed drive signal and the liquid ejected by the non-delayed drive signal are overlapped.
  • the recording apparatus of the present invention includes a plurality of discharge holes, a plurality of pressurization chambers connected to the plurality of discharge holes, and a plurality of pressurization units that respectively pressurize liquids in the plurality of pressurization chambers.
  • the plurality of discharge holes constitute a plurality of discharge hole groups arranged at equal intervals in the first direction and not arranged in a second direction orthogonal to the first direction.
  • the discharge holes belonging to one of the discharge hole groups, the discharge holes belonging to the other discharge hole groups, the liquid discharge heads arranged in the second direction, and the recording A transport unit that moves the liquid ejection head relative to the medium in the second direction; and a control unit that controls the liquid ejection head and the transport unit.
  • a drive signal is sent with a delay so as not to send the drive signal to the pressurizing unit corresponding to the pressurizing chamber at the same time, and the liquid ejected from the ejection holes arranged in the second direction is a recording medium.
  • the difference in time for delaying the drive signals to be discharged so as to overlap is made substantially the same.
  • the recording apparatus of the present invention when landing the liquid ejected from the plurality of ejection holes so as to be one pixel on the recording medium, the liquid ejected by the delayed drive signal and the delay By overlapping the liquid ejected by the drive signal that is not applied, even if there is a difference in the liquid ejection characteristics due to the presence or absence of delay, the difference is averaged, so that the effect is not noticeable Can be printed.
  • FIG. 1 is a schematic configuration diagram of a printer that is a recording apparatus according to an embodiment of the present invention.
  • FIG. 2 is a plan view of a flow path member and a piezoelectric actuator substrate that constitute the liquid ejection head of FIG. 1.
  • FIG. 3 is an enlarged view of a region surrounded by an alternate long and short dash line in FIG.
  • FIG. 3 is an enlarged view of a region surrounded by an alternate long and short dash line in FIG.
  • FIG. 5 is a longitudinal sectional view taken along line VV in FIG. 3.
  • FIG. 5 is a schematic diagram illustrating the arrangement of ejection holes according to an embodiment of the present invention and a state in which recording by droplets ejected from the ejection holes proceeds.
  • FIG. 8 is an enlarged view of a region surrounded by an alternate long and short dash line in FIG.
  • FIG. 9 is a longitudinal sectional view taken along line XX in FIG. 8. It is arrangement
  • FIG. 1 is a schematic configuration diagram of a color inkjet printer which is a recording apparatus including a liquid discharge head according to an embodiment of the present invention.
  • This color inkjet printer 1 (hereinafter referred to as printer 1) has four liquid ejection heads 2. These liquid discharge heads 2 are fixed to a carriage 18, and the carriage 18 is in a direction orthogonal to the conveyance direction of the printing paper P that is a recording medium, that is, in a direction from the front to the back in FIG. It is installed so that it can reciprocate.
  • the four liquid ejection heads 2 are arranged along the direction in which the carriage 18 can reciprocate and are fixed to the printer 1.
  • the liquid discharge head 2 has an elongated shape in the conveyance direction of the printing paper P. This long direction is sometimes called the longitudinal direction.
  • a paper feeding unit 114, a transport unit 120, and a paper receiving unit 116 are sequentially provided along the transport path of the printing paper P.
  • the printer 1 is provided with a control unit 100 for controlling the operation of each unit of the printer 1 such as the liquid discharge head 2 and the paper feeding unit 114.
  • the paper feed unit 114 includes a paper storage case 115 that can store a plurality of printing papers P, and a paper supply roller 145.
  • the paper feed roller 145 can send out the uppermost print paper P among the print papers P stacked and stored in the paper storage case 115 one by one.
  • two pairs of feed rollers 118a and 118b and 119a and 119b are arranged along the transport path of the printing paper P.
  • the printing paper P sent out from the paper supply unit 114 is guided by these feed rollers and further sent out to the transport unit 120.
  • the transport unit 120 includes an endless transport belt 111 and two belt rollers 106 and 107.
  • the conveyor belt 111 is wound around belt rollers 106 and 107.
  • the conveyor belt 111 is adjusted to a length that allows it to be tensioned with a predetermined tension when it is wound around two belt rollers.
  • the conveyor belt 111 is stretched without slack along two parallel planes each including a common tangent of the two belt rollers. Of these two planes, the plane closer to the liquid ejection head 2 is a transport surface 127 that transports the printing paper P.
  • a conveyance motor 174 is connected to the belt roller 106.
  • the transport motor 174 can rotate the belt roller 106 in the direction of arrow A.
  • the belt roller 107 can rotate in conjunction with the transport belt 111. Therefore, the conveyance belt 111 moves along the direction of arrow A by driving the conveyance motor 174 and rotating the belt roller 106.
  • a nip roller 138 and a nip receiving roller 139 are arranged so as to sandwich the conveyance belt 111.
  • the nip roller 138 is urged downward by a spring (not shown).
  • a nip receiving roller 139 below the nip roller 138 receives the nip roller 138 biased downward via the conveying belt 111.
  • the two nip rollers are rotatably installed and rotate in conjunction with the conveyance belt 111.
  • the printing paper P sent out from the paper supply unit 114 to the transport unit 120 is sandwiched between the nip roller 138 and the transport belt 111. As a result, the printing paper P is pressed against the transport surface 127 of the transport belt 111 and is fixed on the transport surface 127.
  • the printing paper P is transported in the direction in which the liquid ejection head 2 is installed according to the rotation of the transport belt 111.
  • the outer peripheral surface 113 of the conveyor belt 111 may be treated with adhesive silicon rubber. Thereby, the printing paper P can be securely fixed to the transport surface 127.
  • the four liquid discharge heads 2 are arranged close to each other along the conveyance direction by the conveyance belt 111.
  • Each liquid discharge head 2 has a head body 13 at the lower end.
  • a number of ejection holes 8 for ejecting liquid are provided on the lower surface of the head body 13 (see FIGS. 4, 5 and 6).
  • a droplet (ink) of the same color is ejected from the ejection hole 8 provided in one liquid ejection head 2.
  • Each liquid discharge head 2 is supplied with liquid from an external liquid tank (not shown).
  • the ejection holes 8 of each liquid ejection head 2 are opened in the ejection hole surface, and are in a first direction (a direction parallel to the printing paper P and perpendicular to a second direction in which the carriage 18 reciprocates). Since a plurality of ejection hole groups 7 are formed at equal intervals in the longitudinal direction of the head 2, droplets ejected from one ejection hole group 7 landed at equal intervals in the first direction.
  • a pixel group can be formed, and droplets ejected from the plurality of ejection hole groups 7 land in the vicinity so as to form one pixel on the printing paper P, so that printing can be performed in one direction without a gap.
  • the colors of the liquid ejected from each liquid ejection head 2 are magenta (M), yellow (Y), cyan (C), and black (K), respectively.
  • Each liquid ejection head 2 is disposed with a slight gap between the lower surface of the head body 13 and the transport surface 127 of the transport belt 111.
  • printing is performed at an interval of 300 dpi on the forward path of the reciprocating movement of the carriage 18, and printing at a resolution of 600 dpi is performed by printing at an interval of 300 dpi so as to land between 300 dpi pixels printed on the forward path on the return path. May be.
  • printing can be performed without being affected by crosstalk, resulting in better image quality. .
  • the printing paper P transported by the transport belt 111 passes through the gap between the liquid ejection head 2 and the transport belt 111. At that time, droplets are ejected from the head main body 13 constituting the liquid ejection head 2 toward the upper surface of the printing paper P. As a result, a color image based on the image data stored by the control unit 100 is formed on the upper surface of the printing paper P.
  • a separation plate 140 and two pairs of feed rollers 121a and 121b and 122a and 122b are disposed between the transport unit 120 and the paper receiving unit 116.
  • the printing paper P on which the color image is printed is conveyed to the peeling plate 140 by the conveying belt 111. At this time, the printing paper P is peeled from the transport surface 127 by the right end of the peeling plate 140.
  • the printing paper P is sent out to the paper receiving unit 116 by the feed rollers 121a to 122b. In this way, the printed printing paper P is sequentially sent to the paper receiving unit 116 and stacked on the paper receiving unit 116.
  • a paper surface sensor 133 is installed between the liquid ejection head 2 and the nip roller 138 that are on the most upstream side in the conveyance direction of the printing paper P.
  • the paper surface sensor 133 includes a light emitting element and a light receiving element, and can detect the leading end position of the printing paper P on the transport path.
  • the detection result by the paper surface sensor 133 is sent to the control unit 100.
  • the control unit 100 can control the liquid ejection head 2, the conveyance motor 174, and the like so that the conveyance of the printing paper P and the printing of the image are synchronized based on the detection result sent from the paper surface sensor 133.
  • FIG. 2 is a top view showing the head main body 13.
  • FIG. 3 is an enlarged perspective view of a region surrounded by a one-dot chain line in FIG. 2 and is a part of the head main body 13.
  • FIG. 4 is an enlarged perspective view of the same position as FIG.
  • some of the flow paths are omitted, and the end 10 a of the pressurizing chamber 10 is connected to the discharge hole 8.
  • the individual electrode 35 is provided immediately above all the pressurizing chambers 10, since it becomes complicated, only the one directly above the pressurizing chamber 10 in the lower right part of the figure is shown. In FIGS.
  • FIG. 5 is a longitudinal sectional view taken along the line VV in FIG. 4, but the flow paths not belonging to one individual flow path 32 are omitted.
  • the head body 13 has a flat plate-like flow path member 4 and a piezoelectric actuator substrate 21 on the flow path member 4.
  • the piezoelectric actuator substrate 21 has a trapezoidal shape, and is disposed on the upper surface of the flow path member 4 so that a pair of parallel opposing sides of the trapezoid is parallel to the longitudinal direction of the flow path member 4.
  • two piezoelectric actuator substrates 21 are arranged on the flow path member 4 as a whole in a zigzag manner, two along each of the two virtual straight lines parallel to the longitudinal direction of the flow path member 4. Yes.
  • the oblique sides of the piezoelectric actuator substrates 21 adjacent to each other on the flow path member 4 partially overlap in the short direction of the flow path member 4. In the area printed by driving the overlapping piezoelectric actuator unit 21, the droplets ejected by the two piezoelectric actuator substrates 21 are mixed and landed.
  • the manifold 5 which is a part of the liquid flow path is formed inside the flow path member 4.
  • the manifold 5 has an elongated shape extending along the longitudinal direction of the flow path member 4, and an opening 5 b of the manifold 5 is formed on the upper surface of the flow path member 4.
  • a total of ten openings 5 b are formed along each of two straight lines (imaginary lines) parallel to the longitudinal direction of the flow path member 4.
  • the opening 5b is formed at a position that avoids a region where the four piezoelectric actuator substrates 21 are disposed.
  • the manifold 5 is supplied with liquid from a liquid tank (not shown) through the opening 5b.
  • the manifold 5 formed in the flow path member 4 is branched into a plurality of pieces (the manifold 5 at the branched portion may be referred to as a sub-manifold 5a).
  • the manifold 5 connected to the opening 5 b extends along the oblique side of the piezoelectric actuator substrate 21 and is disposed so as to intersect with the longitudinal direction of the flow path member 4.
  • one manifold 5 is shared by the adjacent piezoelectric actuator substrates 21, and the sub-manifold 5 a is branched from both sides of the manifold 5.
  • These sub-manifolds 5 a extend in the longitudinal direction of the head main body 13 adjacent to each other in regions facing the piezoelectric actuator substrates 21 inside the flow path member 4.
  • the flow path member 4 has four pressure chamber groups 9 in which a plurality of pressure chambers 10 are formed in a matrix (that is, two-dimensionally and regularly).
  • the pressurizing chamber 10 is a hollow region having a substantially rhombic planar shape with rounded corners.
  • the pressurizing chamber 10 is formed so as to open on the upper surface of the flow path member 4.
  • These pressurizing chambers 10 are arranged over substantially the entire surface of the upper surface of the flow path member 4 facing the piezoelectric actuator substrate 21. Accordingly, each pressurizing chamber group 9 formed by these pressurizing chambers 10 occupies an area having substantially the same size and shape as the piezoelectric actuator substrate 21. Further, since the piezoelectric actuator substrate 21 is laminated so as to cover the plurality of pressurizing chambers 10, the opening of each pressurizing chamber 10 is closed by the piezoelectric actuator substrate 21.
  • the manifold 5 branches into four rows of E1-E4 sub-manifolds 5a arranged in parallel with each other in the short direction of the flow path member 4, and each sub-manifold
  • the pressurizing chambers 10 connected to 5a constitute a row of the pressurizing chambers 10 arranged in the longitudinal direction of the flow path member 4 at equal intervals, and the four rows are arranged in parallel to each other in the lateral direction.
  • Two rows of the pressure chambers 10 connected to the sub-manifold 5a are arranged on both sides of the sub-manifold 5a.
  • the pressurizing chambers 10 connected from the manifold 5 constitute rows of the pressurizing chambers 10 arranged in the longitudinal direction of the flow path member 4 at equal intervals, and the rows are arranged in 16 rows parallel to each other in the short side direction. ing.
  • the number of pressurizing chambers 10 included in each pressurizing chamber row is arranged so as to gradually decrease from the long side toward the short side corresponding to the outer shape of the displacement element 50 that is the pressurizing unit.
  • the discharge holes 8 are also arranged in the same manner. Although this arrangement will be described in detail later, pixels on the printing paper P can be formed by droplets ejected from the two ejection holes 8 and image formation can be performed with a resolution of 300 dpi in the longitudinal direction as a whole. It is possible.
  • the discharge hole 8 when the discharge hole 8 is projected so as to be orthogonal to a virtual straight line parallel to the longitudinal direction of the flow path member 4, it is connected to each sub-manifold 5 a within the range of R 1 of the virtual straight line shown in FIG.
  • the two discharge holes 8 are arranged in the second direction perpendicular to the first direction, and eight sets of the discharge holes 8 are 300 dpi. It is equally spaced.
  • Individual electrodes 35 to be described later are formed at positions facing the pressurizing chambers 10 on the upper surface of the piezoelectric actuator substrate 21. That is, the individual electrode 35 is formed on the upper surface of the piezoelectric actuator substrate 21 in a direction different from the first direction and the first direction.
  • the individual electrode 35 is slightly smaller than the pressurizing chamber 10, has a shape substantially similar to the pressurizing chamber 10, and is disposed so as to be within a region facing the pressurizing chamber 10 on the upper surface of the piezoelectric actuator substrate 21. ing.
  • a large number of discharge holes 8 are formed on the lower surface of the flow path member 4. These discharge holes 8 are arranged at positions avoiding the area facing the sub-manifold 5a arranged on the lower surface side of the flow path member 4. Further, these discharge holes 8 are arranged in a region facing the piezoelectric actuator substrate 21 on the lower surface side of the flow path member 4. These discharge hole groups 7 occupy an area having substantially the same size and shape as the piezoelectric actuator substrate 21, and droplets are discharged from the discharge holes 8 by displacing the displacement elements 50 of the corresponding piezoelectric actuator substrate 21. it can. The arrangement of the discharge holes 8 will be described in detail later. The discharge holes 8 in each region are arranged at equal intervals along a plurality of straight lines parallel to the longitudinal direction of the flow path member 4.
  • the flow path member 4 included in the head body 13 has a laminated structure in which a plurality of plates are laminated. These plates are a cavity plate 22, a base plate 23, an aperture (squeezing) plate 24, supply plates 25 and 26, manifold plates 27, 28 and 29, a cover plate 30 and a nozzle plate 31 in order from the upper surface of the flow path member 4. is there. A number of holes are formed in these plates. Each plate is aligned and laminated so that these holes communicate with each other to form the individual flow path 32 and the sub-manifold 5a. As shown in FIG. 5, the head body 13 has the pressurizing chamber 10 on the upper surface of the flow path member 4, the sub-manifold 5 a on the inner lower surface side, and the discharge holes 8 on the lower surface. Are arranged close to each other at different positions, and the sub-manifold 5 a and the discharge hole 8 are connected via the pressurizing chamber 10.
  • each plate will be described. These holes include the following. First, the pressurizing chamber 10 formed in the cavity plate 22. Secondly, there is a communication hole that constitutes a flow path that connects from one end of the pressurizing chamber 10 to the sub-manifold 5a. This communication hole is formed in each plate from the base plate 23 (specifically, the inlet of the pressurizing chamber 10) to the supply plate 25 (specifically, the outlet of the sub-manifold 5a). The communication hole includes the aperture 12 formed in the aperture plate 24 and the individual supply flow path 6 formed in the supply plates 25 and 26.
  • a communication hole that constitutes a flow path that communicates from the other end of the pressurizing chamber 10 to the discharge hole 8, and this communication hole is referred to as a descender (partial flow path) in the following description.
  • the descender is formed on each plate from the base plate 23 (specifically, the outlet of the pressurizing chamber 10) to the nozzle plate 31 (specifically, the discharge hole 8).
  • a communication hole constituting the sub-manifold 5a.
  • the communication holes are formed in the manifold plates 27-29.
  • Such communication holes are connected to each other to form an individual flow path 32 extending from the liquid inflow port (outlet of the submanifold 5a) to the discharge hole 8 from the submanifold 5a.
  • the liquid supplied to the sub-manifold 5a is discharged from the discharge hole 8 through the following path. First, from the sub-manifold 5a, it passes through the individual supply flow path 6 and reaches one end of the aperture 12. Next, it proceeds horizontally along the extending direction of the aperture 12 and reaches the other end of the aperture 12. From there, it reaches one end of the pressurizing chamber 10 upward. Furthermore, it progresses horizontally along the extending direction of the pressurizing chamber 10 and reaches the other end of the pressurizing chamber 10. While moving little by little in the horizontal direction from there, it proceeds mainly downward and proceeds to the discharge hole 8 opened in the lower surface.
  • the piezoelectric actuator substrate 21 has a laminated structure composed of two piezoelectric ceramic layers 21a and 21b, as shown in FIG. Each of these piezoelectric ceramic layers 21a and 21b has a thickness of about 20 ⁇ m. The thickness of the laminated body of the piezoelectric ceramic layers 21a and 21b of the piezoelectric actuator substrate 21 is about 40 ⁇ m, and the displacement can be increased by being 100 ⁇ m or less.
  • the piezoelectric actuator substrate 21 is laminated on the planar surface of the flow path member 4 where the pressurizing chamber 10 is open, and the piezoelectric ceramic layers 21 a and 21 b straddle the plurality of pressurizing chambers 10. (See FIG. 3).
  • the piezoelectric ceramic layers 21a and 21b are made of a lead zirconate titanate (PZT) ceramic material having ferroelectricity.
  • PZT lead zirconate titanate
  • the piezoelectric actuator substrate 21 is interposed between the adjacent pressurizing chambers 10. It is effective by a recording apparatus that delays the drive signal so as to suppress the occurrence of crosstalk, but it is also effective if the liquid in the pressurizing chamber 10 is pressurized by other methods. .
  • the adjacent pressurization chamber 10 said here is the pressurization chamber 10 with the shortest distance between them, More specifically, the side of a substantially rhombus or more generally a parallelogram is It is the pressurizing chamber 10 facing and adjacent.
  • each of the plurality of ejection hole groups 7 is composed of n rows (n is an integer of 2 or more) of ejection hole rows in which a plurality of ejection holes 8 are arranged in the first direction
  • the plurality of pressurizing chambers 10 respectively connected to the plurality of discharge holes 8 belonging to the hole group 7 are each composed of n rows of pressurizing chamber rows, and the plurality of discharge holes 8 included in one discharge hole row.
  • the control unit 100 can simultaneously send drive signals to be sent to one pressurization chamber row 10. is there.
  • the piezoelectric actuator substrate 21 is made of a common electrode 34 made of a metal material such as Ag—Pd, an individual electrode 35 made of a metal material such as Au, and a metal material such as Au made on the individual electrode 35. It has a connection electrode.
  • the individual electrode 35 is, as described above, the individual electrode main body disposed at a position facing the pressurizing chamber 10 on the upper surface of the piezoelectric actuator substrate 21, and the lead extracted from the individual electrode main body to a position where the pressurizing chamber 10 is not present. Electrodes.
  • a connection electrode 36 is formed at a position where there is no pressurizing chamber 10 of the extraction electrode.
  • the thickness of the individual electrode 35 is 0.3 to 1 ⁇ m.
  • connection electrode 36 is made of, for example, gold containing glass frit, and has a convex shape with a thickness of about 5 to 15 ⁇ m.
  • the connection electrode 36 is electrically joined to an electrode provided on an FPC (FlexibleFlexPrinted Circuit) which is an external wiring (not shown).
  • FPC FlexibleFlexPrinted Circuit
  • a drive signal (drive voltage) is supplied to the individual electrode 35 from the control unit 100 through the FPC.
  • the drive signal is supplied in a constant cycle in synchronization with the conveyance speed of the printing paper P.
  • the common electrode 34 is formed over substantially the entire surface in the area between the piezoelectric ceramic layer 21a and the piezoelectric ceramic layer 21b. That is, the common electrode 34 extends so as to cover all the pressurizing chambers 10 in the region facing the piezoelectric actuator substrate 21.
  • the thickness of the common electrode 34 is about 2 ⁇ m.
  • the common electrode 34 is grounded in a region not shown, and is held at the ground potential.
  • a surface electrode (not shown) different from the individual electrode 35 is formed on the piezoelectric ceramic layer 21b at a position avoiding the electrode group composed of the individual electrodes 35.
  • the surface electrode is electrically connected to the common electrode 34 through a through-hole formed in the piezoelectric ceramic layer 21b, and is connected to another electrode in the external wiring, like the large number of individual electrodes 35. Has been.
  • the piezoelectric actuator substrate 21 has two piezoelectric ceramic layers.
  • the piezoelectric ceramic layers having three or more phases are laminated so that the individual electrodes 35 and the common electrodes 34 are alternately arranged. You may arrange.
  • the common electrode 34 and the individual electrode 35 are arranged so as to sandwich only the uppermost piezoelectric ceramic layer 21b.
  • a region sandwiched between the individual electrode 35 and the common electrode 34 in the piezoelectric ceramic layer 21b is called an active portion, and the piezoelectric ceramic in that portion is polarized in the thickness direction.
  • the piezoelectric actuator substrate 21 of the present embodiment only the uppermost piezoelectric ceramic layer 21b includes an active portion, and the piezoelectric ceramic 21a does not include an active portion and functions as a diaphragm.
  • the piezoelectric actuator substrate 21 has a so-called unimorph type configuration.
  • the piezoelectric actuator substrate 21 includes a plurality of displacement elements 50.
  • the amount of liquid ejected from the liquid ejection port 8 by one ejection operation is about 5 to 7 pL (picoliter).
  • the individual electrode 35 is set to a potential higher than the common electrode 34 (hereinafter referred to as a high potential) in advance, and the individual electrode 35 is temporarily set to the same potential as the common electrode 34 every time there is a discharge request. (Hereinafter referred to as a low potential), and then set to a high potential again at a predetermined timing.
  • the piezoelectric ceramic layers 21a and 21b return to their original shapes at the timing when the individual electrodes 35 become low potential, and the volume of the pressurizing chamber 10 increases compared to the initial state (the state where the potentials of both electrodes are different). To do.
  • a negative pressure is applied to the pressurizing chamber 10 and the liquid is sucked into the pressurizing chamber 10 from the manifold 5 side.
  • the piezoelectric ceramic layers 21a and 21b are deformed so as to protrude toward the pressurizing chamber 10, and the pressure in the pressurizing chamber 10 is reduced due to the volume reduction of the pressurizing chamber 10.
  • the pressure becomes positive and the pressure on the liquid rises, and droplets are ejected. That is, a drive signal including a pulse based on a high potential is supplied to the individual electrode 35 in order to eject a droplet.
  • This pulse width is ideally AL (Acoustic Length), which is the length of time during which the pressure wave propagates from the manifold 5 to the discharge hole 8 in the pressurizing chamber 10.
  • AL Acoustic Length
  • the main crosstalk is that when the pressure displacement element 50 is displaced, the displacement element 50 contracts in the surface direction, so that the stress affects the adjacent displacement element 50, the liquid in the pressurizing chamber 10.
  • the vibration is transmitted to the adjacent pressurizing chamber 10 through the flow path member 4, and the vibration of the liquid in the pressurizing chamber 10 is transmitted to the sub manifold 5a via the squeezing 12, and is further connected to the sub manifold 5a.
  • a drive signal is originally sent at a time (T + delay time) when a drive signal is sent at a certain time T, and the adjacent pressurization chambers among the pressurization chambers 10 arranged in a matrix are used.
  • T + delay time the delay time is set so that the difference in the landing position on the printing paper P is about half of the pixels so that the positional deviation of the landing position is not noticeable.
  • FIG. 6 shows the progress of recording performed by the portion B of the ejection holes 8 shown in FIG. 4 and the ejection holes 8 within the range of R1.
  • the discharge holes 8 constitute a discharge hole group 7 that is arranged two-dimensionally at equal intervals d in the first direction and so as not to line up in the second direction orthogonal to the first direction.
  • the discharge holes 8 belonging to the discharge hole group 7 are arranged so as to be aligned with the discharge holes belonging to other discharge hole groups (discharge holes 8 not belonging to the discharge hole group 7 in FIG. 6) in the second direction. Has been.
  • printing can be performed on the printing paper P at intervals d by the ejection holes 8 belonging to the ejection hole group 7, and the printing paper P can be printed by droplets ejected from the ejection holes 8 belonging to the two ejection hole groups.
  • One upper pixel can be formed.
  • the recording progress state shows a state in which one line is printed by the ejection holes 8 within the range of R1.
  • the droplets ejected from the ejection hole array N4a land on the printing paper P in the vicinity of the pixels formed by the ejection hole array N2a (ideally at the same point) and combine to form one pixel.
  • one line in which one pixel is formed by droplets ejected from the two ejection holes 8 can be printed. Note that, depending on the object to be printed, one pixel is formed by droplets ejected from one ejection hole 8.
  • a drive signal is sent simultaneously to one pressurization chamber row (actually a voltage change is caused to the displacement element 50 corresponding to the discharge hole 8 from which the droplet is discharged, and belongs to the pressurization chamber row.
  • a voltage change is not necessarily generated in the displacement elements 50 corresponding to all of the pressurizing chambers 10. In the following, it may be expressed in this way, including a case where a driving signal in which the voltage does not change is sent).
  • the presence or absence of delay is varied between adjacent pressurizing chamber rows. Specifically, since one pressurizing chamber 10 has four pressurizing chambers 10 adjacent to each other, there are four sets of pressurizing chambers 10 adjacent to the one pressurizing chamber 10. It will be.
  • the presence or absence of delay of the two pressurizing chambers 10 is changed.
  • the method of delaying is, for example, alternately with no delay, with delay,... In order from the left pressurization chamber row in FIG. Thereby, it is possible to prevent the drive signals from being simultaneously sent to the adjacent pressurizing chambers 10 and to suppress crosstalk.
  • the delays of the pressurization chamber rows C1a, C3a, C5a, C7a, C9a, C11a, C13a, C15a, C1b, C3b, C5b, C7b, C9b, C11b, C13b, C15b are delayed 0, that is, not delayed.
  • a drive signal is sent, and the pressurization chamber rows C2a, C4a, C6a, C8a, C10a, C12a, C14a, C16a, C2b, C4b, C6b, C8b, C10b, C12b, C14b, C16b have a delay 1, that is, a predetermined delay time
  • the driven signal is sent.
  • three types of delay times can be set, and the pressure chambers connected to one sub-manifold 5a include different delay times including those that are not delayed. You can do it.
  • the displacement element 50 given the delay is driven after the displacement element 50 not given the delay, it is affected even though the influence is small as compared with the case of being driven simultaneously. For example, if the amount of droplets ejected by the displacement element 50 given a delay is slightly smaller, the pixels where they overlap are compared with the pixels where the droplets ejected by the displacement element 50 not given a delay overlap. And become smaller. Therefore, if one of the droplets ejected so as to overlap is ejected with a drive signal without delay and one is ejected with a delayed drive signal, the size of the pixels is averaged. Therefore, if all of the droplets that are ejected so as to overlap are mixed with those that have a drive signal delay and those that do not, the average size of the landed pixels will be the same size. Can be
  • this has the same effect on the fluctuation of the discharge speed. That is, when the discharge speed varies, the time until landing changes, and during that time, the liquid discharge head 2 and the printing paper P move relative to each other, resulting in a difference in landing position. If there is a speed difference between the liquid of the drive signal that has not been delayed and the liquid of the drive signal that has been delayed, the landing position will shift and the pixels will become slightly elliptical in the relative movement direction. Since a similar tendency occurs in pixels formed by a plurality of liquid droplets, it is difficult to visually recognize printing variations.
  • the difference in ejection characteristics is caused by the difference in the presence or absence of delay, but the difference in ejection characteristics is also caused to some extent by the length of the delay time. Therefore, when two or more kinds of delay times can be set, the liquid that becomes one pixel is formed by making the difference in time for delaying the drive signal for discharging them substantially the same.
  • the shape can be made the same. More specifically, a drive signal with no delay, a drive signal with a delay of 6 ⁇ s, and a drive signal with a delay of 12 ⁇ s can be sent, and a droplet as one pixel is driven with a drive signal without delay and a drive with a delay of 6 ⁇ s.
  • the difference in delay time becomes the same as 6 ⁇ m, so that the shape of the formed pixel becomes close. This is the same when three or more liquids overlap, and it is preferable that the delay time differences are all substantially the same when the delay times are arranged in order from the longest.
  • the difference between the delay times mentioned here is substantially the same as the difference between the delay time difference and the delay time difference is within 20%, more preferably within 10%, particularly within 5%. Is preferred.
  • the amount of delay in this case, no delay is added, so the amount of delay becomes the difference in delay.
  • the shape of the overlapped pixels can be made close. In this case, substantially the same is the same range as described above.
  • the pixel size may change due to the difference in droplet landing time. For example, a difference may occur depending on whether the previously landed liquid has landed on the printing paper P or has landed in the middle.
  • the degree of influence and which pixel becomes larger vary depending on the type of recording paper P and the like, but if the landing time intervals are set to the same level, the degree of influence can be reduced.
  • the interval between the ejection holes 8 for ejecting droplets forming one pixel can be shortened.
  • the recording accuracy can be increased by matching the position as close as possible on the liquid ejection head 2.
  • the configurations shown in FIGS. 4 to 6 among the 16 discharge hole columns, the first and sixth rows, the second and fourth rows, the third and ninth rows, and the fifth row.
  • the 7th and 8th rows, the 8th and 14th rows, the 10th and 12th rows, the 11th and 16th rows, the 13th and 15th rows are arranged in the second direction. Therefore, the interval between each pair of discharge holes 8 can be shortened.
  • n is an even number of 4 or more
  • m is an integer of 2 or more
  • n is every n ⁇ 1 rows from the i-th row (i is an integer from 1 to m).
  • the discharge holes 8 connected to the pressurizing chambers 10 belonging to the row may be arranged so as to be aligned in the second direction. In this way, since the ejection holes 8 forming one pixel are arranged every n rows, the interval between the landing times can be shortened.
  • the driving which gives a delay time of (Tp ⁇ Tq) seconds to the pressurizing chamber which sends a drive signal giving a delay time of Tq (q is an integer of 1 to p) is given in the return path.
  • the delay time is preferably a time corresponding to 1/8 to 1/4 of the pixel diameter. Since ejection with a delay is performed after ejection without giving a delay, the influence is less than that with simultaneous ejection, but it is affected by ejection without delay. The results of the effects vary, but one of the droplets that were discharged, especially the minute droplets divided into the main droplets, landed on the printing paper P, and were called minute satellites called satellites. Some dots are printed.
  • these micro droplets have a slower flight speed than the main droplets, they are printed behind the main droplets. Therefore, by causing a droplet that has not been delayed to land slightly behind a droplet that has not been delayed, a satellite slightly behind can be included in one pixel. As a result, the pixels become slightly larger in the second direction, but it is preferable that the pixel is within the above-mentioned range because the influence of image quality improvement due to the decrease in satellites is increased.
  • the displacement element 50 using piezoelectric deformation is shown as the pressurizing unit.
  • the present invention is not limited to this, and any other device that can pressurize the liquid in the liquid pressurizing chamber 10 is used.
  • the liquid in the liquid pressurizing chamber 10 may be heated and boiled to generate pressure, or may be one using MEMS (Micro Electro Mechanical Systems).
  • FIG. 7 is a plan view of the head main body 302a.
  • FIG. 8 is an enlarged view of the region surrounded by the alternate long and short dash line in FIG.
  • the manifold 305, the discharge hole 308, and the pressurizing chamber 310 that are to be drawn by broken lines below the piezoelectric actuator substrate 321 are drawn by solid lines.
  • the individual electrode 325 is provided immediately above all the pressurizing chambers 310, since it is complicated, only the individual electrode 325 directly above the pressurizing chamber 310 in the lower right part of the figure is shown.
  • FIG. 9 is a longitudinal sectional view taken along line XX in FIG.
  • the head main body 302a of this embodiment includes a flow path member 304 and a piezoelectric actuator substrate 321 in which a displacement element (pressurizing unit) 330 is formed.
  • the flow path member 304 constituting the head main body 302a includes a manifold 305, a plurality of pressure chambers 310 connected to the manifold 305, and a plurality of discharge holes 308 respectively connected to the plurality of pressure chambers 310.
  • the pressurizing chamber 310 is open on the upper surface of the flow path member 304.
  • An upper surface of the flow path member 304 has an opening 305a connected to the manifold 305, and liquid is supplied from the opening 305a.
  • a piezoelectric actuator substrate 321 including a displacement element 330 is bonded to the upper surface of the flow path member 304, and each displacement element 330 is provided on the pressurizing chamber 310.
  • the head main body 302 a has a flat plate-like flow path member 304 and one piezoelectric actuator substrate 321 including a displacement element 330 on the flow path member 304.
  • the planar shape of the piezoelectric actuator substrate 321 is rectangular, and is arranged on the upper surface of the flow path member 304 so that the long side of the rectangle is along the longitudinal direction of the flow path member 304.
  • the manifold 305 has an elongated shape extending along the longitudinal direction of the flow path member 304, and openings 305 a of the manifold 305 are formed on the upper surface of the flow path member 304 at both ends thereof.
  • four manifolds 305 are provided independently, and a liquid is supplied from the outside to each opening 305a.
  • the flow path member 304 is formed by two-dimensionally expanding a plurality of pressurizing chambers 310.
  • the pressurizing chamber 310 is a hollow region having a substantially rhombic planar shape with rounded corners.
  • the pressurizing chamber 310 is connected to one manifold 305 through an individual supply channel 314.
  • the intervals in the longitudinal direction of the pressurizing chambers 310 in the respective pressurizing chamber rows 311 are the same, and the interval is 37.5 dpi.
  • each pressurizing chamber row 311 is a dummy and is not connected to the manifold 305.
  • the structure (rigidity) around the pressurizing chamber 310 one inner side from the end is close to the structure (rigidity) of the other pressurizing chamber 310, so that the difference in liquid ejection characteristics can be reduced.
  • the pressurizing chambers 310 of each pressurizing chamber row 311 are arranged in a staggered manner so that corners are located between the pressurizing chambers 310 belonging to the adjacent pressure chamber row 11.
  • the eight rows of pressurizing chambers 310 on one side from the center in the short side direction are arranged slightly shifted in the longitudinal direction, so that the entire 8 rows are 300 dpi in the longitudinal direction. They are lined up at intervals. The same applies to the eight rows on the opposite side from the center, and the arrangement of the pressurizing chambers 310 is such that they are translated in the lateral direction.
  • pressurizing chambers 310 are arranged over almost the entire surface of the upper surface of the flow path member 304 in the region facing the piezoelectric actuator substrate 321, although there are some widened portions such as between the pressurizing chamber groups. . That is, the pressurizing chamber group formed by these pressurizing chambers 310 occupies a region having substantially the same size and shape as the piezoelectric actuator substrate 321. Further, the opening of each pressurizing chamber 310 is closed by bonding the piezoelectric actuator substrate 321 to the upper surface of the flow path member 304.
  • a descender connected to the discharge hole 308 opened in the discharge surface on the lower surface of the flow path member 304 extends from the corner facing the corner where the individual supply flow path 314 of the pressurizing chamber 310 is connected.
  • the descender extends in the direction of extending the diagonal line of the pressurizing chamber in plan view. That is, the arrangement of the discharge holes 308 in the longitudinal direction and the arrangement of the pressurizing chambers 310 are the same.
  • the pressurization chambers 310 are arranged at an interval of 37.5 dpi, and the discharge holes 308 connected to the two manifolds 305 on one side from the center in the short side direction as a whole are arranged in the longitudinal direction (first order).
  • the ejection holes 308 on both sides with respect to the center in the short direction are in a relationship of being translated in a second direction (short direction) which is a direction orthogonal to the first direction, and one side
  • the discharge hole 308 is aligned with the discharge hole 308 on the other side in the second direction.
  • each manifold 305 is within the range of R4 of the virtual straight line shown in FIG. That is, four discharge holes 308 connected to each other, that is, a total of 16 discharge holes 308 are projected at the same position two by two, and the projected points are equally spaced at 300 dpi. Accordingly, by supplying the same color ink to all the manifolds 305, an image can be formed with a resolution of 300 dpi in the longitudinal direction with the liquid discharged from the two discharge holes 308 as a whole.
  • Individual electrodes 325 are formed at positions facing the pressurizing chambers 310 on the upper surface of the piezoelectric actuator substrate 321.
  • the individual electrode 325 includes an individual electrode main body 325a that is slightly smaller than the pressurizing chamber 310 and has a shape substantially similar to the pressurizing chamber 310, and an extraction electrode 325b that is extracted from the individual electrode main body 325a.
  • the individual electrode 325 constitutes an individual electrode row.
  • a common electrode surface electrode 328 that is electrically connected to the common electrode 324 is formed on the upper surface of the piezoelectric actuator substrate 321.
  • the common electrode surface electrodes 328 are formed in two rows along the longitudinal direction at the central portion in the short direction of the piezoelectric actuator substrate 321 and are formed in one row along the short direction near the end in the longitudinal direction. ing. Although the illustrated common electrode surface electrode 328 is intermittently formed on a straight line, it may be formed continuously on a straight line.
  • Two signal transmission units are arranged and bonded to the piezoelectric actuator substrate 321 from the two long sides of the piezoelectric actuator substrate 321 toward the center.
  • the common electrode surface electrode 328 is connected at the end of the signal transmission unit (the front end and the longitudinal end of the piezoelectric actuator substrate 321), and the common electrode surface electrode 328 and the common electrode connection electrode formed thereon are provided. Since the area is larger than that of the extraction electrode 325b and the connection electrode 326 formed on the extraction electrode 325b, the signal transmission portion can be hardly separated from the end.
  • the discharge hole 308 is disposed at a position avoiding a region facing the manifold 305 disposed on the lower surface side of the flow path member 304. Further, the discharge hole 308 is disposed in a region facing the piezoelectric actuator substrate 321 on the lower surface side of the flow path member 304. These discharge holes 308 occupy a region having substantially the same size and shape as the piezoelectric actuator substrate 321 as one group, and the displacement elements 330 of the corresponding piezoelectric actuator substrate 321 are displaced from the discharge holes 308. Droplets can be ejected.
  • the flow path member 304 included in the head main body 302a has a laminated structure in which a plurality of plates are laminated. These plates are, in order from the upper surface of the flow path member 304, a cavity plate 304a, a base plate 304b, an aperture plate 304c, a supply plate 304d, manifold plates 304e-g, a cover plate 304h, a cover space plate 304i, and a nozzle plate 304j. It is.
  • the basic flow path configuration is the same as that shown in FIG. In the cover space plate 304i, a hole serving as a damper chamber 318 formed under the manifold 305 is formed. The damper chamber 318 is not connected to the liquid flow path and does not allow liquid to enter.
  • the cover plate 304h between the damper chamber 318 and the manifold 305 serves as a damper.
  • the pressure is transmitted between the pressurizing chambers 310 to reduce the crosstalk that affects the discharge characteristics.
  • the damper chamber 318 is a sealed space, the damper is activated by the volume change of the air.
  • the damper chamber 318 is connected to the outside of the flow path member 304 by a hole different from the above-described hole. Work better as a damper.
  • the basic structure of the piezoelectric actuator substrate 321 is the same as that of the piezoelectric actuator substrate 21 shown in FIG.
  • the pressurizing chamber row 311 is C301 to C316 in order from the left, and the discharge hole rows are N301 to N316 in order.
  • the pressurizing chamber 310 of C301 is connected to the discharge hole 8 of N301, which is the same up to C316 and N316, and the order is not changed.
  • the discharge holes 308 included in the discharge hole group 307 constitute discharge hole arrays 308 parallel to the first direction of eight lines N301 to N308, and the discharge holes 308 of each discharge hole array. Are arranged at equal intervals 8d, and the discharge holes 308 are aligned at equal intervals d as a whole.
  • the discharge holes 308 that do not belong to the discharge hole group 307 constitute another discharge hole group.
  • the arrangement of the discharge rows N309 to N316 constituting this discharge hole group is an arrangement in which the discharge hole rows N301 to N308 are translated in the second direction.
  • the pressurization chamber rows C301, C303, C305, C307, C310, C312, C314, and C316 have a delay of 0, that is, a non-delayed drive signal is sent, and the pressurization chamber rows C302, C304, C306, C308, C309, C311, and C313 , C315 is sent with a delay 1, that is, a drive signal with a predetermined delay time.
  • the pressurizing chamber rows C308 and C309 are not adjacent to the pressurizing chambers 310 belonging to them, even if the pressurizing chamber pressurizing chambers 310 belonging to the pressurizing chamber rows C308 and C309 are driven at the same time, they are generated. Crosstalk is small.
  • “not adjacent” means that the sides are not arranged close to each other (the distance between them is within the maximum width of the pressurizing chamber 310).

Landscapes

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

Abstract

La présente invention vise à proposer un dispositif d'impression dans lequel une irrégularité d'impression est difficilement visible lorsqu'un pixel sur un support d'impression est formé par des gouttelettes déchargées à partir d'une pluralité de trous de décharge. À cet effet, l'invention porte sur un dispositif d'impression caractérisé en ce qu'il a : des têtes de décharge de liquide, une pluralité de trous de décharge (8) étant configurés d'une pluralité de groupes de trous de décharge (7) dans lesquels la pluralité de trous de décharge (8) sont disposés à des intervalles réguliers dans la première direction et conçus de façon à ne pas être alignés dans la seconde direction perpendiculaire à la première direction, et les trous de décharge (8) appartenant à l'un des groupes de trous de décharge (7) sont disposés de façon à être alignés avec les trous de décharge (8) appartenant à l'autre des groupes de trous de décharge (7) dans la seconde direction; une unité de transport; et une unité de commande (100) et en ce que l'unité de commande (100) retarde et transmet des signaux de commande lors de la transmission des signaux de commande à des unités de pression (50) correspondant à une partie des trous de décharge (8), et amène des liquides déchargés par des signaux de commande retardés et les liquides déchargés par des signaux de commande non retardés à se chevaucher entre eux lors de la chute des liquides déchargés à partir des trous de décharge (8) alignés dans la seconde direction, de sorte que les liquides se chevauchent un support d'impression.
PCT/JP2011/077044 2010-12-20 2011-11-24 Dispositif d'impression WO2012086360A1 (fr)

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JP2010-283267 2010-12-20
JP2010283267 2010-12-20

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007044967A (ja) * 2005-08-09 2007-02-22 Fujifilm Holdings Corp 液滴吐出装置及び画像形成装置
JP2007253337A (ja) * 2006-03-20 2007-10-04 Dainippon Screen Mfg Co Ltd インクジェット印刷装置およびその印刷方法

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007044967A (ja) * 2005-08-09 2007-02-22 Fujifilm Holdings Corp 液滴吐出装置及び画像形成装置
JP2007253337A (ja) * 2006-03-20 2007-10-04 Dainippon Screen Mfg Co Ltd インクジェット印刷装置およびその印刷方法

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