WO2013002263A1 - 液体吐出ヘッド、およびそれを用いた記録装置 - Google Patents
液体吐出ヘッド、およびそれを用いた記録装置 Download PDFInfo
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- WO2013002263A1 WO2013002263A1 PCT/JP2012/066398 JP2012066398W WO2013002263A1 WO 2013002263 A1 WO2013002263 A1 WO 2013002263A1 JP 2012066398 W JP2012066398 W JP 2012066398W WO 2013002263 A1 WO2013002263 A1 WO 2013002263A1
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- manifold
- sub
- liquid discharge
- discharge head
- flow path
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Classifications
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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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B17/00—Apparatus for spraying or atomising liquids or other fluent materials, not covered by the preceding groups
- B05B17/04—Apparatus for spraying or atomising liquids or other fluent materials, not covered by the preceding groups operating with special methods
- B05B17/06—Apparatus for spraying or atomising liquids or other fluent materials, not covered by the preceding groups operating with special methods using ultrasonic or other kinds of vibrations
- B05B17/0607—Apparatus for spraying or atomising liquids or other fluent materials, not covered by the preceding groups operating with special methods using ultrasonic or other kinds of vibrations generated by electrical means, e.g. piezoelectric transducers
- B05B17/0638—Apparatus for spraying or atomising liquids or other fluent materials, not covered by the preceding groups operating with special methods using ultrasonic or other kinds of vibrations generated by electrical means, e.g. piezoelectric transducers spray being produced by discharging the liquid or other fluent material through a plate comprising a plurality of orifices
- B05B17/0646—Vibrating plates, i.e. plates being directly subjected to the vibrations, e.g. having a piezoelectric transducer attached thereto
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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
- B41J2/015—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
- B41J2/055—Devices for absorbing or preventing back-pressure
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
- B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
- B41J2/01—Ink jet
- B41J2/135—Nozzles
- B41J2/14—Structure thereof only for on-demand ink jet heads
- B41J2/14201—Structure of print heads with piezoelectric elements
- B41J2/14209—Structure of print heads with piezoelectric elements of finger type, chamber walls consisting integrally of piezoelectric material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
- B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
- B41J2/01—Ink jet
- B41J2/135—Nozzles
- B41J2/14—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
- B41J2/14201—Structure of print heads with piezoelectric elements
- B41J2002/14306—Flow passage between manifold and 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
- B41J2002/14419—Manifold
-
- 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 liquid discharge head that discharges droplets, and a recording apparatus using the same.
- 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.
- actuator units having a plurality of displacement elements provided so as to cover the chambers are stacked.
- pressurization chambers connected to a plurality of ejection holes are arranged in a matrix, and the displacement element of the actuator unit provided so as to cover it is displaced to eject ink from each ejection hole.
- printing is possible at a resolution of 600 dpi in the main scanning direction.
- an object of the present invention is to provide a liquid discharge head capable of reducing the size in the short direction while reducing crosstalk, and a recording apparatus using the same.
- the liquid discharge head includes a plurality of discharge holes, a plurality of pressure chambers connected to the plurality of discharge holes, and a one-way long channel member having a manifold for supplying liquid to the plurality of pressure chambers. And a plurality of pressurizing sections that are joined to the flow path member and change the volumes of the plurality of pressurization chambers, respectively, when the flow path member is viewed in plan view
- the manifold extends from one end side to the other end side of the flow path member, is partitioned by a plurality of sub-manifolds with a partition wall long in the one direction, and both end portions of the flow path member
- the pressurizing chambers opened to the outside and connected to one of the sub-manifolds constitute two pressurizing chamber rows arranged along the sub-manifold, and belong to the pressurizing chamber row
- the pressurizing chamber is adjacent to the pressurizing chamber row Wherein the non-overlapping in the one direction and pressurizing chamber belonging to the pressure chamber column to.
- the recording apparatus of the present invention includes the liquid discharge head, a transport unit that transports a recording medium to the liquid discharge head, and a control unit that controls the plurality of pressurizing units. To do.
- the present invention it is possible to reduce the size of the liquid discharge head in the short direction while reducing the influence of crosstalk, so that the printing accuracy can be increased.
- FIG. 1 is a schematic configuration diagram of a color inkjet printer that is a recording apparatus including a liquid ejection head according to an embodiment of the present invention.
- FIG. 2 is a plan view of a flow path member and a piezoelectric actuator constituting 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. 3 is an enlarged view of a region surrounded by an alternate long and short dash line in FIG.
- (A) is a longitudinal sectional view of the manifold along the line XX of the liquid ejection head of FIG. 2, and (b) to (f) are longitudinal sectional views of the manifold of the same part of the other liquid ejection heads. It is. It is a top view of the manifold plate used for the liquid discharge head of other embodiments of the present invention.
- 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 arranged along the conveyance direction of the printing paper P, and the liquid discharge heads 2 fixed to the printer 1 have an elongated shape extending in the direction from the front to the back in FIG. ing. 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 has 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 such a length that it is stretched 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 line 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 liquid discharge head 2 has a head body 2a at the lower end.
- the lower surface of the head body 2a is a discharge hole surface 4-1, in which a large number of discharge holes for discharging liquid are provided.
- a liquid droplet (ink) of the same color is ejected from the liquid 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 liquid ejection holes 8 of each liquid ejection head 2 are open to the surface of the liquid ejection holes, and are in one direction (a direction parallel to the printing paper P and perpendicular to the conveyance direction of the printing paper P, and the longitudinal direction of the liquid ejection head 2. (Direction) at equal intervals, it is possible to print without gaps in one direction.
- the colors of the liquid ejected from each liquid ejection head 2 are, for example, magenta (M), yellow (Y), cyan (C), and black (K), respectively.
- Each liquid discharge head 2 is arranged with a slight gap between the lower surface of the liquid discharge head main body 13 and the transport surface 127 of the transport belt 111.
- 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 2 a 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 plan view of the head main body 2a.
- FIG. 3 is an enlarged view of the region surrounded by the alternate long and short dash line in FIG. 2, and is a plan view in which some of the flow paths are omitted for explanation.
- 4 and 6 are enlarged views of a region surrounded by an alternate long and short dash line in FIG. 2, and a part of the flow paths different from FIG. 3 are omitted for explanation.
- FIG. 5 is a longitudinal sectional view taken along line VV in FIG. Further, the discharge hole 8 in FIG. 4 is drawn larger than the actual diameter for easy understanding of the position.
- the liquid discharge head 2 includes a reservoir and a metal casing in addition to the head body 2a. Also.
- the head body 2 a includes a flow path member 4 and a piezoelectric actuator substrate 21 in which a displacement element (pressurizing unit) 30 is formed.
- the flow path member 4 constituting the head body 2a includes a manifold 5 which is a common flow path, a plurality of pressurizing chambers 10 connected to the manifold 5, and a plurality of discharge holes respectively connected to the plurality of pressurizing chambers 10.
- the pressurizing chamber 10 is opened on the upper surface of the flow path member 4, and the upper surface of the flow path member 4 is a pressurizing chamber surface 4-2.
- an opening 5a connected to the manifold 5 is provided on the upper surface of the flow path member 4, and liquid is supplied from the opening 5a.
- a piezoelectric actuator substrate 21 including a displacement element 30 is joined to the upper surface of the flow path member 4, and each displacement element 30 is provided on the pressurizing chamber 10.
- the piezoelectric actuator substrate 21 is connected to a signal transmission unit 92 such as an FPC (Flexible Printed Circuit) for supplying a signal to each displacement element 30.
- a signal transmission unit 92 such as an FPC (Flexible Printed Circuit) for supplying a signal to each displacement element 30.
- FIG. 2 the outline of the vicinity of the signal transmission unit 92 connected to the piezoelectric actuator 21 is indicated by a dotted line so that the two signal transmission units 92 are connected to the piezoelectric actuator substrate 21.
- the electrodes formed on the signal transmission unit 92 that are electrically connected to the piezoelectric actuator 21 are arranged in a rectangular shape at the end of the signal transmission unit 92.
- the two signal transmission portions 92 are connected so that their ends come to the center portion in the short direction of the piezoelectric actuator substrate
- a driver IC is mounted on the signal transmission unit 92.
- the driver IC is mounted so as to be pressed against the metal casing, and the heat of the driver IC is transmitted to the metal casing and dissipated to the outside.
- a drive signal for driving the displacement element 30 on the piezoelectric actuator substrate 21 is generated in the driver IC.
- a signal for controlling the generation of the drive signal is generated by the control unit 100 and input from the end of the signal transmission unit 92 opposite to the side connected to the piezoelectric actuator substrate 21.
- a circuit board or the like is provided in the liquid ejection head 2 between the control unit 100 and the signal transmission unit 92 as necessary.
- the head body 2 a has one plate-like flow path member 4 and one piezoelectric actuator substrate 21 including a displacement element 30 connected on the flow path member 4.
- the planar shape of the piezoelectric actuator substrate 21 is rectangular, and is arranged on the upper surface of the flow path member 4 so that the long side of the rectangle is along the longitudinal direction of the flow path member 4.
- the manifold 5 has an elongated shape that extends from one end side in the longitudinal direction of the flow path member 4 to the other end side, and the manifold opening 5a that opens to the upper surface of the flow path member 4 at both ends. Is formed.
- a central portion in the length direction which is a region connected to the pressurizing chamber 10 is partitioned by a partition wall 15 provided at intervals in the width direction.
- the partition wall 15 has the same height as the manifold 5 in the central portion in the length direction, which is a region connected to the pressurizing chamber 10, and completely separates the manifold 5 into a plurality of sub-manifolds 5b. By doing so, it is possible to provide the discharge hole 8 and a descender connected from the discharge hole 8 to the pressurizing chamber 10 so as to overlap with the partition wall 15 when seen in a plan view.
- the whole of the manifold 5 except for both ends is partitioned by a partition wall 15.
- one of the both end portions other than one end portion may be partitioned by the partition wall 15.
- only the vicinity of the opening 5a opened on the upper surface of the flow path member 4 is not partitioned, and a partition wall may be provided in the depth direction of the flow path member 4 from the opening 5a.
- it is preferable that both ends of the manifold 5 are not partitioned by the partition wall 15 because the flow resistance is reduced and the supply amount of the liquid can be increased because there is a portion that is not partitioned. Such an embodiment will be described in further detail later.
- the manifold 5 that is divided into a plurality of parts is sometimes referred to as a sub-manifold 5b.
- two manifolds 5 are provided independently, and openings 5a are provided at both ends.
- One manifold 5 is provided with seven partition walls 15 and divided into eight sub-manifolds 5b.
- the width of the sub-manifold 5b is larger than the width of the partition wall 15, so that a large amount of liquid can flow through the sub-manifold 5b.
- the length of the seven partition walls 15 becomes longer as they are closer to the center in the width direction.
- the ends of the partition walls 15 are closer to the ends of the manifold 5 as the partition walls 15 are closer to the center in the width direction.
- a support body 17 is provided in the sub-manifold 5b so as to cross in the width direction.
- the support body 17 connects the adjacent partition walls 15 to each other or connects the partition wall 15 at the end and the wall of the manifold 5.
- the flow path member 4 has a structure in which flat plates 4a to 4l are laminated, and the support body 17 supports a partition portion serving as the partition wall 15 in the manufacturing process. With such a structure, the flow path member 4 in which each flow path is formed can be produced simply by stacking the plates 4a to 4l. In the present embodiment, the partition part falls off the plate without the support 17.
- the partition portion will not fall off, but the partition portion serving as the partition wall 15 that partitions the sub-manifold 5b long in one direction is supported. Without the body 17, stacking deviation is likely to occur in the width direction of the sub-manifold 5b. for that reason.
- the support body 17 so as to cross the sub-manifold 5b in the width direction, the manufacturing accuracy of the flow path can be increased.
- the flow path member 4 is formed by two-dimensionally expanding a plurality of pressurizing chambers 10.
- the pressurizing chamber 10 is a hollow region having a substantially rhombic planar shape with rounded corners.
- the pressurizing chamber 10 is connected to one sub-manifold 5b via an individual supply channel 14.
- two rows of pressurizing chambers 11 which are rows of pressurizing chambers 10 connected to the sub-manifold 5b are provided, one on each side of the sub-manifold 5b. Yes. Accordingly, 16 rows of pressurizing chambers 11 are provided for one manifold 5, and 32 rows of pressurizing chamber rows 11 are provided in the entire head body 2a.
- the intervals in the longitudinal direction of the pressurizing chambers 10 in the respective pressurizing chamber rows 11 are the same, for example, 37.5 dpi.
- a dummy pressurizing chamber 16 is provided at the end of each pressurizing chamber row 11.
- the dummy pressurizing chamber 16 is connected to the manifold 5 but is not connected to the discharge hole 8.
- a dummy pressurizing chamber row in which dummy pressurizing chambers 16 are arranged in a straight line is provided outside the 32 pressurizing chamber rows 11.
- the dummy pressurizing chamber 16 is not connected to either the manifold 5 or the discharge hole 8.
- the dummy pressurizing chambers are provided at both ends in the length direction. Since the influence in the width direction is relatively small, it is provided only on the side closer to the end of the head main body 21a. Thereby, the width
- the pressurizing chamber 10 connected to one manifold 5 is arranged on a lattice that forms rows and columns along each outer side of the rectangular piezoelectric actuator substrate 21.
- the individual electrodes 25 formed on the pressurizing chamber 10 are arranged at equal distances from the outer side of the piezoelectric actuator substrate 21. Therefore, when forming the individual electrodes 25, the piezoelectric actuator substrate is formed. 21 can be hardly deformed.
- the piezoelectric actuator substrate 21 and the flow path member 4 are joined, if this deformation is large, stress may be applied to the displacement element 30 near the outer side, resulting in variations in displacement characteristics. However, by reducing the deformation, The variation can be reduced.
- the dummy pressurizing chamber row of the dummy pressurizing chamber 16 is provided outside the pressurizing chamber row 11 closest to the outer side, the influence of deformation can be made less susceptible.
- the pressurizing chambers 10 belonging to the pressurizing chamber row 11 are arranged at equal intervals, and the individual electrodes 25 corresponding to the pressurizing chamber rows 11 are also arranged at equal intervals.
- the pressurizing chamber rows 11 are arranged at equal intervals in the short direction, and the rows of individual electrodes 25 corresponding to the pressurizing chamber rows 11 are also arranged at equal intervals in the short direction. Thereby, it is possible to eliminate a portion where the influence of the crosstalk becomes particularly large.
- the pressurizing chambers 10 are arranged in a lattice shape, but may be arranged in a staggered manner so that corners are located between the pressurizing chambers 10 belonging to the adjacent pressure chamber rows 11. In this way, since the distance between the pressurizing chambers 10 belonging to the adjacent pressurizing chamber row 11 becomes longer, crosstalk can be further suppressed.
- the pressurizing chambers 10 belonging to one pressurizing chamber row 11 are added to the adjacent pressurizing chamber rows 11.
- the pressure chamber 10 and the liquid discharge head 2 are arranged so as not to overlap in the longitudinal direction.
- the width of the liquid discharge head 2 is increased.
- the influence of the relative position accuracy of the liquid discharge head 2 on the printing result is increased. Therefore, by making the width of the partition wall 15 smaller than that of the sub-manifold 5b, the influence of the accuracy on the printing result can be reduced.
- the pressurizing chamber 10 connected to one sub-manifold 5b forms two pressurizing chamber rows 11, and the discharge holes 8 connected to the pressurizing chambers 10 belonging to one pressurizing chamber row 11 are: One discharge hole row 9 is formed.
- the discharge holes 8 connected to the pressurizing chambers 10 belonging to the two pressurizing chamber rows 11 are opened on different sides of the sub manifold 5b.
- the partition wall 15 is provided with two rows of discharge holes 9.
- the discharge holes 8 belonging to each of the discharge hole rows 9 are connected to the sub-manifold 5 b on the side close to the discharge holes 8 in the pressurizing chamber 10. Are connected through.
- the pressurizing chamber 10 and the discharge hole 8 are connected. Since crosstalk between the flow paths can be suppressed, crosstalk can be further reduced. If the entire flow path connecting the pressurizing chamber 10 and the discharge hole 8 is arranged so as not to overlap in the longitudinal direction of the liquid discharge head 2, crosstalk can be further reduced.
- the width of the liquid discharge head 2 can be reduced by arranging the pressurizing chamber 10 and the sub-manifold 5b so as to overlap each other in plan view.
- the ratio of the overlapping area to the area of the pressurizing chamber 10 is 80% or more, and further 90% or more, the width of the liquid discharge head 2 can be further reduced.
- the bottom surface of the pressurizing chamber 10 where the pressurizing chamber 10 and the sub-manifold 5b overlap is less rigid than the case where the pressurizing chamber 10 and the sub-manifold 5b do not overlap. There is a risk of variation.
- the ratio of the area of the pressurizing chamber 10 overlapping the sub-manifold 5b to the area of the entire pressurizing chamber 10 substantially the same in each pressurizing chamber 10, the rigidity of the bottom surface constituting the pressurizing chamber 10 is increased. Variations in ejection characteristics due to changes can be reduced.
- substantially the same means that the difference in area ratio is 10% or less, particularly 5% or less.
- a plurality of pressurizing chambers 10 are connected to one manifold 5 to form a pressurizing chamber group. Since there are two manifolds 5, there are two pressurizing chamber groups. The arrangement of the pressurizing chambers 10 related to ejection in each pressurizing chamber group is the same, and is arranged to be translated in the lateral direction. These pressurizing chambers 10 are arranged over almost the entire surface although there are portions where the gaps between the pressurizing chamber groups are slightly wide in the region facing the piezoelectric actuator substrate 21 on the upper surface of the flow path member 4. . That is, the pressurizing chamber group formed by these pressurizing chambers 10 occupies an area having almost the same size and shape as the piezoelectric actuator substrate 21. Further, the opening of each pressurizing chamber 10 is closed by bonding the piezoelectric actuator substrate 21 to the upper surface of the flow path member 4.
- a descender connected to the discharge hole 8 opened in the discharge hole surface 4-1 on the lower surface of the flow path member 4 extends from a corner portion of the pressurizing chamber 10 facing the corner portion where the individual supply flow path 14 is connected. ing.
- the descender extends in a direction away from the pressurizing chamber 10 in plan view. More specifically, the pressurizing chamber 10 extends away from the direction along the long diagonal line while being shifted to the left and right with respect to that direction.
- the discharge chambers 8 can be arranged at an interval of 1200 dpi as a whole, while the pressurization chambers 10 are arranged in a lattice pattern in which the intervals in the respective pressurization chamber rows 11 are 37.5 dpi.
- each manifold 5 is within the range of R of the virtual straight line shown in FIG. That is, 16 discharge holes 8 connected to, and a total of 32 discharge holes 8 are equally spaced by 1200 dpi.
- an image can be formed with a resolution of 1200 dpi in the longitudinal direction as a whole.
- one discharge hole 8 connected to one manifold 5 is equally spaced at 600 dpi within the range of R of the imaginary straight line.
- a reservoir may be joined to the flow path member 4 in the liquid discharge head 2 so as to stabilize the supply of liquid from the opening 5a of the manifold.
- the reservoir is provided with a flow path that branches the liquid supplied from the outside and is connected to the two openings 5a, so that the liquid can be stably supplied to the two openings.
- temperature fluctuations and pressure fluctuations of the liquid supplied from the outside are transmitted to the openings 5a at both ends of the manifold 5 with a small time difference. Variations in droplet ejection characteristics can be further reduced.
- a filter may be provided so as to prevent foreign matters in the liquid from moving toward the flow path member 4.
- a heater may be provided so as to stabilize the temperature of the liquid toward the flow path member 4.
- Individual electrodes 25 are formed at positions facing the pressurizing chambers 10 on the upper surface of the piezoelectric actuator substrate 21.
- the individual electrode 25 includes an individual electrode main body 25a that is slightly smaller than the pressurizing chamber 10 and has a shape substantially similar to the pressurizing chamber 10, and an extraction electrode 25b that is extracted from the individual electrode main body 25a.
- the individual electrode 25 constitutes an individual electrode row and an individual electrode group.
- a common electrode surface electrode 28 is formed on the upper surface of the piezoelectric actuator substrate 21 and is electrically connected to the common electrode 24 via a via hole.
- the common electrode surface electrodes 28 are formed in two rows along the longitudinal direction at the central portion of the piezoelectric actuator substrate 21 in the lateral direction, and are formed in one row along the lateral direction near the end in the longitudinal direction. ing. Although the illustrated common electrode surface electrode 28 is intermittently formed on a straight line, it may be formed continuously on a straight line.
- the piezoelectric actuator substrate 21 is formed by laminating and firing a piezoelectric ceramic layer 21a having a via hole, a common electrode 24, and a piezoelectric ceramic layer 21b, as will be described later, and then forming individual electrodes 25 and a common electrode surface electrode 28 in the same process. It is preferable to do this.
- the positional variation between the individual electrode 25 and the pressurizing chamber 10 greatly affects the ejection characteristics, and if the individual electrode 25 is formed and then fired, the piezoelectric actuator substrate 21 may be warped.
- stress is applied to the piezoelectric actuator substrate 21, and the displacement may vary due to the influence. Therefore, the individual electrode 25 is formed after firing.
- the surface electrode 28 for the common electrode may be warped, and if the surface electrode 28 is formed at the same time as the individual electrode 25, the positional accuracy becomes higher and the process can be simplified.
- the surface electrode 28 is formed in the same process.
- the two signal transmission portions 92 are arranged and bonded to the piezoelectric actuator substrate 21 from the two long sides of the piezoelectric actuator substrate 21 toward the center.
- the connection is facilitated by forming the connection electrode 26 and the common electrode connection electrode on the extraction electrode 25b and the common electrode surface electrode 28 of the piezoelectric actuator substrate 21a, respectively, and connecting them.
- the area of the common electrode surface electrode 28 and the common electrode connection electrode is made larger than the area of the connection electrode 26, the end of the signal transmission unit 92 (the end of the piezoelectric actuator substrate 21 and the end in the longitudinal direction of the piezoelectric actuator substrate 21). ) Can be made stronger by the connection on the common electrode surface electrode 28, so that the signal transmission portion 92 can be made difficult to peel off from the end.
- the discharge hole 8 is arranged at a position avoiding the area facing the manifold 5 arranged on the lower surface side of the flow path member 4. Further, the discharge hole 8 is disposed in a region facing the piezoelectric actuator substrate 21 on the lower surface side of the flow path member 4. These discharge holes 8 occupy a region having almost the same size and shape as the piezoelectric actuator substrate 21 as a group, and the displacement elements 30 of the corresponding piezoelectric actuator substrate 21 are displaced to displace the discharge holes 8 from the discharge holes 8. Droplets can be ejected.
- the flow path member 4 included in the head body 2a has a laminated structure in which a plurality of plates are laminated. These plates are a cavity plate 4a, a base plate 4b, an aperture plate 4c, a supply plate 4d, manifold plates 4e to j, a cover plate 4k, and a nozzle plate 4l in order from the upper surface of the flow path member 4. A number of holes are formed in these plates. Since the thickness of each plate is about 10 to 300 ⁇ m, the formation accuracy of the holes to be formed can be increased. Each plate is aligned and laminated so that these holes communicate with each other to form the individual flow path 12 and the manifold 5.
- the pressurizing chamber 10 is on the upper surface of the flow path member 4, the manifold 5 is on the inner lower surface side, the discharge holes 8 are on the lower surface, and the parts constituting the individual flow path 12 are close to each other in different positions.
- the manifold 5 and the discharge hole 8 are connected via the pressurizing chamber 10.
- the holes formed in each plate will be described. These holes include the following.
- the first is the pressurizing chamber 10 formed in the cavity plate 4a.
- This communication hole is formed in each plate from the base plate 4b (specifically, the inlet of the pressurizing chamber 10) to the supply plate 4c (specifically, the outlet of the manifold 5).
- the individual supply flow path 14 includes a squeeze 6 that is formed in the aperture plate 4c and is a portion where the cross-sectional area of the flow path is small.
- 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 4b (specifically, the outlet of the pressurizing chamber 10) to the nozzle plate 4l (specifically, the discharge hole 8).
- the hole of the nozzle plate 4l is opened as a discharge hole 8 having a diameter that is open to the outside of the flow path member 4, for example, 10 to 40 ⁇ m, and the diameter increases toward the inside. .
- communication holes constituting the manifold 5.
- the communication holes are formed in the manifold plates 4e to 4j.
- the partition portions of the manifold plates 4e to 4j are connected to the manifold plates 4e to j by a half-etched support portion 17. The arrangement of the support 17 will be described in detail later.
- the first to fourth communication holes are connected to each other to form an individual flow path 12 from the liquid inlet (manifold 5 outlet) to the discharge hole 8 from the manifold 5.
- the liquid supplied to the manifold 5 is discharged from the discharge hole 8 through the following path. First, from the manifold 5, it enters the individual supply flow path 14 and reaches one end of the throttle 6.
- the hole of the aperture plate 4c including the portion to be the squeezing 6 (hereinafter, sometimes referred to as the hole to be squeezed) is slightly overlapped with the other pressurizing chamber 10 connected from the same sub-manifold 5b. It has become. If the holes of the aperture plate 4c including the portion to be the aperture 6 are arranged so as to be included in the sub-manifold 5b in plan view, the apertures 6 can be arranged more densely, which is preferable. However, in such a case, the entire hole to be squeezed is disposed on a portion of the sub-manifold 5b that is thinner than other portions, and is easily affected by the surroundings.
- Such an arrangement includes a plate with holes to be squeezed (if the plate is composed of a plurality of plates, the uppermost plate among them) and a plate with holes to be the pressurizing chamber 10 (with a plurality of plates). When it is configured, it is particularly necessary when the number of plates between the lowermost plate) is one and vibration is easily transmitted.
- the distance between the plate having the holes to be squeezed and the plate having the holes to be the pressurizing chamber 10 is 200 ⁇ m or less, and further 100 ⁇ m or less. In order to arrange them so as not to overlap, for example, the angle of the hole to be squeezed as shown in FIG. Good.
- the piezoelectric actuator substrate 21 has a laminated structure composed of two piezoelectric ceramic layers 21a and 21b which are piezoelectric bodies. Each of these piezoelectric ceramic layers 21a and 21b has a thickness of about 20 ⁇ m. The thickness from the lower surface of the piezoelectric ceramic layer 21a of the piezoelectric actuator substrate 21 to the upper surface of the piezoelectric ceramic layer 21b is about 40 ⁇ m. Both of the piezoelectric ceramic layers 21 a and 21 b extend so as to straddle the plurality of pressure chambers 10. These piezoelectric ceramic layers 21a and 21b are made of, for example, a lead zirconate titanate (PZT) ceramic material having ferroelectricity.
- PZT lead zirconate titanate
- the piezoelectric actuator substrate 21 has a common electrode 24 made of a metal material such as Ag—Pd and an individual electrode 25 made of a metal material such as Au.
- the individual electrode 25 includes the individual electrode main body 25a disposed at the position facing the pressurizing chamber 10 on the upper surface of the piezoelectric actuator substrate 21, and the extraction electrode 25b extracted therefrom.
- a connection electrode 26 is formed at a portion of one end of the extraction electrode 25 b that is extracted outside the region facing the pressurizing chamber 10.
- the connection electrode 26 is made of, for example, silver-palladium containing glass frit, and has a convex shape with a thickness of about 15 ⁇ m.
- the connection electrode 26 is electrically joined to an electrode provided in the signal transmission unit 92.
- a drive signal is supplied from the control unit 100 to the individual electrode 25 through the signal transmission unit 92.
- the drive signal is supplied in a constant cycle in synchronization with the conveyance speed of the print medium P.
- the common electrode 24 is formed over almost the entire surface in the area between the piezoelectric ceramic layer 21a and the piezoelectric ceramic layer 21b. That is, the common electrode 24 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 24 is about 2 ⁇ m.
- the common electrode 24 is connected to the common electrode surface electrode 28 formed at a position avoiding the electrode group composed of the individual electrodes 25 on the piezoelectric ceramic layer 21b through a via hole formed in the piezoelectric ceramic layer 21b. Grounded and held at ground potential.
- the common electrode surface electrode 28 is connected to another electrode on the signal transmission unit 92 in the same manner as the large number of individual electrodes 25.
- a displacement element 30, which is a piezoelectric actuator having a unit structure as shown in FIG. 5, is added to each pressurizing chamber 10 in a laminate composed of two piezoelectric ceramic layers 21 a and 21 b.
- the piezoelectric actuator substrate 21 includes a plurality of displacement elements 30 as pressurizing portions.
- the diaphragm 21a is located directly above the pressure chamber 10, is formed by a common electrode 24, a piezoelectric ceramic layer 21b, and individual electrodes 25. Yes.
- the amount of liquid ejected from the liquid ejection port 8 by one ejection operation is about 1.5 to 4.5 pl (picoliter).
- the large number of individual electrodes 25 are individually electrically connected to the control unit 100 via the signal transmission unit 92 and wiring so that the potential can be individually controlled.
- an electric field is applied to the piezoelectric ceramic layer 21b in the polarization direction by setting the individual electrode 25 to a potential different from that of the common electrode 24, a portion to which the electric field is applied functions as an active portion that is distorted by the piezoelectric effect.
- the control unit 100 sets the individual electrode 25 to a predetermined positive or negative potential with respect to the common electrode 24 so that the electric field and the polarization are in the same direction, a portion sandwiched between the electrodes of the piezoelectric ceramic layer 21b. (Active part) contracts in the surface direction.
- the piezoelectric ceramic layer 21a which is an inactive layer, is not affected by an electric field, so that it does not spontaneously shrink and tries to restrict deformation of the active portion.
- the piezoelectric ceramic layer 21b there is a difference in strain in the polarization direction between the piezoelectric ceramic layer 21b and the piezoelectric ceramic layer 21a, and the piezoelectric ceramic layer 21b is deformed so as to protrude toward the pressurizing chamber 10 (unimorph deformation).
- the individual electrode 25 is set to a potential higher than the common electrode 24 (hereinafter referred to as a high potential) in advance, and the individual electrode 25 is temporarily set to the same potential as the common electrode 24 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 electrode 25 becomes 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 21 a and 21 b are deformed so as to protrude toward the pressurizing chamber 10.
- the pressure becomes positive and the pressure on the liquid rises, and droplets are ejected. That is, in order to discharge the droplet, a drive signal including a pulse based on a high potential is supplied to the individual electrode 25.
- the ideal pulse width is AL (Acoustic Length), which is the length of time during which the pressure wave propagates from the orifice 6 to the discharge hole 8.
- gradation expression is performed by the number of droplets ejected continuously from the ejection holes 8, that is, the droplet amount (volume) adjusted by the number of droplet ejections. For this reason, the number of droplet discharges corresponding to the designated gradation expression is continuously performed from the discharge holes 8 corresponding to the designated dot region.
- the interval between pulses supplied to eject liquid droplets is AL.
- the period of the residual pressure wave of the pressure generated when discharging the previously discharged liquid droplet coincides with the pressure wave of the pressure generated when discharging the liquid droplet discharged later, and these are superimposed.
- the pressure for discharging the droplet can be amplified. In this case, it is considered that the speed of the liquid droplets ejected later increases, but this is preferable because the landing points of a plurality of liquid droplets are close.
- the displacement element 30 using piezoelectric deformation is shown as the pressurizing unit.
- the displacement element 30 is not limited to this, and can change the volume of the pressurizing chamber 10, that is, pressurizing. Any other device that can pressurize the liquid in the chamber 10 may be used.
- the liquid in the pressurizing chamber 10 is heated and boiled to generate pressure, or MEMS (Micro Electro Mechanical Systems) is used. It may be a thing.
- FIG. 7A is a longitudinal sectional view of the sub-manifold 5b taken along line XX of FIG. 6 of the liquid discharge head 2 described above.
- the left side of the drawing is the manifold opening 5a side
- the right side is the center side of the sub-manifold 5b. That is, in FIG. 7A, the liquid basically flows from left to right (may vary depending on the image to be printed, but on average, the liquid flows toward the center of the sub-manifold 5b. That is).
- the flow path member 4 of the liquid discharge head 2 has a structure in which a plurality of sub-manifolds 5 b are partitioned by partition walls 15.
- the manifold plates 4e to j are formed with holes to be the sub-manifolds 5b and partition portions to be the partition walls 15.
- the partition portion is not connected to the surroundings. Therefore, after forming the hole to be the sub-manifold 5b, the partition portion cannot be held as it is. For this reason, a partition 17 and manifold plates 4e to 4j or a support 17 that connects the partitions is provided.
- the support 17 hinders the flow of the liquid in the sub-manifold 5b, it is preferable to reduce the influence by arranging the support 17 in consideration of the flow of the liquid.
- the support body 17 located above half the height of the sub-manifold 5b in the stacking direction and the support body 17 located below the half are arranged separately in the length direction of the sub-manifold 5b.
- the first to third manifold plates 4e to g from the top are provided with the upper support group 19a in which the first to third support bodies 17 are arranged side by side, and the fourth to sixth positions from the top.
- the manifold plates 4h to j are arranged separately from the lower support group 19b in which the fourth to sixth support bodies 17 are arranged side by side.
- the manifold plates 4e to 4g have the same thickness.
- the upper support group 19a and the lower support group are dependent on the height of the support 17 in the stacking direction.
- 19b may be divided and provided separately in the length direction of the sub-manifold 5b.
- manifold plates of 100 ⁇ m, 100 ⁇ m, 50 ⁇ m, 100 ⁇ m, and 150 ⁇ m are stacked from the top, the upper half of the support layer is 250 ⁇ m, and the upper half is the upper support group, and the lower half is 250 ⁇ m.
- a two-layer support from the bottom may be a lower support group, and these may be arranged separately.
- the inside of the sub-manifold 5b of the support 17 is also different.
- the height of the upper support group 19a and the lower support group 19b may be divided and arranged. Furthermore, when the support body 17 located in the center of the lamination direction exists, the support body 17 may be classified and disposed as either the upper support group 19a or the lower support group 19b.
- the center of gravity of the support body 17 located in the center in the stacking direction belongs to the upper support group 19a if it is close to the upper surface of the sub-manifold 5b, and belongs to the lower support group 19b if it is close to the lower surface. If the thickness of the thickest manifold plate is made thinner than 1/3 of the height of the sub-manifold 5b, the height of the flow path remaining as a portion through which the liquid flows can be increased, and the flow path resistance can be reduced.
- the upper support group 19a and the lower support group 19b are arranged separately, and further, the third and fourth support bodies 17 from the left that are adjacent to each other with the boundary between them,
- the manifold plates 4e and 4j having the above are not directly stacked, and the other manifold plates 4f to 4i are stacked.
- the liquid flows in the lower half of the sub-manifold 5b where the upper support group 19a is present, and flows in the upper half of the sub-manifold 5b where the lower support group 19b is present.
- the support bodies 17 adjacent to each other across the boundary are arranged apart from each other in the stacking direction, the liquid passes between the support bodies 17 and passes from the upper side to the lower side.
- the flow path resistance of the sub-manifold 5b can be reduced.
- the flow path resistance of the sub-manifold 5b is small, liquid supply is unlikely to be insufficient, and stable printing can be performed.
- the difference in pressure applied to the individual supply flow path 14 in the length direction of the sub-manifold 5b becomes small. As a result, the discharge speed, the discharge amount, etc. in the length direction of the liquid discharge head 2 are reduced. The difference in the discharge characteristics can be reduced, and the printing accuracy can be increased.
- the number of manifold plates is 3 or less, the influence of the manifold plate located in the center in the stacking direction is increased, and the flow of liquid cannot be smoothed. Therefore, the number of manifold plates is preferably 4 or more. If the manifold plate is positioned so that the boundary of the manifold plate stacking is located at the center in the stacking direction of the submanifold 5b, the height of the submanifold 5b is increased in both the upper support group 19a and the lower support group 19b. The half of the flow path can be secured.
- the distance in the stacking direction between the supports 17 is more specifically the distance in the stacking direction between the lower end of the support 17 positioned on the upper side and the upper end of the support 17 positioned on the lower side. That is.
- the manifold plates 4e to 4g provided with the support bodies 17 adjacent to each other in the length direction of the sub-manifold 5b are directly stacked, so that the main liquid flows. Since the flow height on the lower side of the sub-manifold 5b changes smoothly, the flow path resistance can be further reduced.
- being directly laminated means that the relationship between the manifold plates 4e to 4j is described, and does not mean that no adhesive layer or the like is interposed therebetween.
- the body 17 may be arranged.
- the support body 17 in the upper support group 19a, the support body 17 is arranged so that the position thereof becomes higher in order toward the center of the support group 19, and in the lower support group 19b, the support body 17 is disposed in the support group 19. What is necessary is just to arrange
- each manifold plate 4e to j since the support body 17 connected to one partition portion is connected to a different position, it is difficult for the partition portion to be bent in the manufacturing process or the like, and it is difficult to reduce the accuracy of the flow path. .
- the manifold plates 4e to 4j provided with the support bodies 17 connected to the same position in the adjacent partition wall 15 are changed. Specifically, for example, when the arrangement of the support 17 in one sub-manifold 5b is the third, second, first, sixth, fifth, and fourth from the top, the adjacent sub-manifold 5b Then, on the contrary, the fourth, fifth, sixth, first, second, third from the top may be set in order.
- the support bodies 17 adjacent to each other in the length direction of the sub-manifold 5b may partially overlap each other in the stacking direction. However, if the support bodies 17 are arranged apart from each other, the liquid flow becomes smoother. The larger the distance in the length direction of the sub-manifold 5b between the supports 17 in one sub-manifold 5b, the smoother the flow. In the manifold plates 4e to 4j, the distance between the support bodies 17 connected to one partition portion also increases, and there is a possibility that the position cannot be sufficiently maintained.
- the arrangement of the support 17 as described above is more useful when the distance between the support 17 in the sub-manifold 5b is somewhat close.
- the distance is at a position within 0.01 seconds at the liquid flow speed in the sub-manifold 5b.
- the liquid flow rate in the sub-manifold 5b is about 0.2 m / s when printing with a maximum discharge of about 200 mPa ⁇ s or less is performed, this speed is 0.01.
- the support group 19 is arranged as one group in the flow channel structure in which the end of the partition portion that becomes the partition wall 15 is not connected to the manifold plates 4e to j as in the present embodiment. Since the position accuracy is likely to be deteriorated even if it is bent or not bent, if each support plate 17 is provided at a position close to the end in each of the manifold plates 4e to 4j, the position accuracy of the end portion can be increased. Further, since the support body 17 is provided at a position closer to the end, the length in the length direction of the sub-manifold 5b of the support body 17 closest to the end is set to the width of the support body 17 provided at another part. It may be smaller.
- the distance between the support groups 19 be 0.01 seconds or longer.
- the arrangement for bringing the support groups 19 close to each other will be described later.
- FIGS. 7B to 7D show the arrangement of another support 17 in the liquid discharge head 2 of the present invention.
- the basic structure of the liquid discharge head 2 other than the arrangement of the support 17 is the same as that shown in FIGS. In each figure, the liquid basically flows from left to right.
- the supports 17 are arranged in the order of the first, second, third, sixth, fifth, and fourth from the top along the liquid flow.
- the support portions 17 belonging to the upper support portion group 219a are arranged such that the distance from the plate 4d that is the upper surface of the sub-manifold 5b increases as the liquid flows.
- the support portions 17 belonging to the lower support portion group 219b are arranged so that the distance from the plate 4k that is the lower surface of the sub-manifold 5b increases.
- the upper support portion group 319a and the lower support portion group 319b are alternately arranged close to each other.
- being close to each other means within about 0.01 seconds in the flow of the liquid.
- the two support parts 17 adjacent to each other across the boundary are arranged apart from each other in the stacking direction at all the boundaries between the upper support part group 319a and the lower support part group 319b. .
- the liquid smoothly flows from the upper side to the lower side or from the lower side to the upper side through the space between the supports 17 at the boundary, so that the flow path resistance of the sub-manifold 5b is reduced. be able to.
- the arrangement of the supports 17 is the same as that shown in FIG. 7 (a), but the thickness of each support 17 is thinner than the manifold plates 404e to 404j provided therewith. It has become. Thereby, channel resistance can be made smaller. Although it is not necessary to make all the support bodies 17 thin, it is possible to further reduce the channel resistance by making all the supports 17 thin. In order to thin the support 17, for example, half etching may be performed when a hole to be the sub-manifold 5 b is etched.
- the support body 17 belonging to the upper support section group 519a leaves the upper side (that is, the lower end of the support body 17 is positioned above the lower surfaces of the manifold plates 404e to 404g) and belongs to the lower support section group 519b. If the support 17 is left on the lower side (that is, the upper end of the support 17 is located below the upper surface of the manifold plates 404h to j), the height of the portion through which the liquid mainly passes can be increased. The channel resistance can be further reduced.
- a channel connected to the discharge hole 8 is provided on the upper surface of the sub-manifold 5b. Therefore, in order to stabilize the flow in this portion near the upper surface, it is preferable that the support 17 of the manifold plate 404e, which is stacked at the top of the manifold plates 404e to 404j, remains on the lower side. Further, the lower surface of the sub-manifold 5b may be a damper that can be deformed so as to change the volume of the sub-manifold 5b. It is preferable that the support body 17 of the laminated manifold plate 404j is left on the upper side.
- liquid discharge head according to another embodiment of the present invention will be described.
- the basic structure of this liquid discharge head is the same as that of the liquid discharge head 2 shown in FIGS. 2 to 5, but the manner in which the manifold 5 is partitioned by the partition 15 is different.
- the manifold 5 is partitioned by a partition wall 15 up to the end of the manifold plate.
- FIG. 8 is a plan view of a manifold plate 704e used for the liquid discharge head in this embodiment.
- the manifold plate 704e has a plurality of holes 705b-1 serving as the sub-manifold 5b.
- the plurality of holes 705b-1 are long and completely independent holes in one direction, and are completely partitioned by a portion 715-1 serving as a partition wall of the manifold plate 704e.
- the manifold plate 2704e also has small holes other than the hole 705b-1 serving as a sub-manifold, such as a descender, but these are omitted in the figure.
- the manifold plate 704e is used in place of the manifold plate 4e of the liquid discharge head 2 shown in FIGS. With such a structure, in the manifold plate 704e, the portion 715-1 that becomes the partition wall is connected to the outer peripheral portion of the manifold plate 704e, and thus it is necessary to provide a support portion to hold the partition wall 15 Will disappear. If a support portion is provided in the sub-manifold 5b, the flow passage resistance of the sub-manifold 5b increases and the liquid flow rate decreases.
- liquid discharge element connected from the portion where the support portion of the sub-manifold 5b is provided has a possibility that a difference in discharge characteristics from other liquid discharge elements may occur because the shape of the sub-manifold 5b differs from other portions by the support portion. is there. Therefore, such a point can be improved by eliminating the support portion.
- the number of support portions is small, only some of the manifold plates may be completely partitioned by a portion that becomes a partition wall. However, it is more preferable that all the manifold plates are completely partitioned at a portion to be a partition wall and no support portion is provided. By doing in this way, if the range in which the manifold plates are stacked or if there is one manifold plate, the manifold 5 is completely partitioned by the partition wall 15 from one end to the other end in the manifold plate. .
- the part to be the partition wall is elongated, when the plates are stacked, the width of the sub-manifold 5b may change due to bending to the left and right, and the discharge characteristics may vary. Therefore, a support portion may be provided in order to maintain the position of the part that becomes the partition wall. Even in such a case, since both ends of the portion to be the partition wall are connected to the plate, the number of support portions can be reduced and the interval between the support portions can be increased, so that the above-described effect can be obtained.
- the sub-manifolds 5b from the end of the sub-manifold 5b to the opening 5a to the outside of the manifold plate are not changed. May be connected while being partitioned by the partition wall 15. Further, one plate may be connected to the plate on the uppermost manifold plate, or one plate may be connected to the other while reaching the pressurizing chamber surface 4-2. This is preferable because the flow path resistance of the connected portion is reduced and the flow rate can be increased. It is preferable that one is connected on the uppermost manifold plate in that the flow rate can be increased. Further, it is preferable to reduce the number of the openings 5a in the pressurizing chamber surface 4-2, since poor connection with the outside hardly occurs.
- both ends of the portion 715-1 serving as the partition Either one of them may be connected. At that time, all the ends to be connected may be arranged on one side, may be alternately arranged, or may be arranged in another manner. Even if both ends are connected and the end is half-etched, a part is connected in the thickness direction, and the other part is connected to the hole 705b-1 serving as a sub-manifold. Also good.
- the sub-manifold can be connected to the one that is connected in the middle of the opening 5a to the outside.
- the difference can be eliminated more effectively.
- both ends of the portion 715-1 serving as the partition wall are connected to the outer peripheral portion of the manifold plate.
- the sub-manifold 5b is bent in a plane direction between the portions of the sub-manifold 5b where the pressurizing chamber 10 is connected to the opening 5a, and is close to the center in the short direction. What is necessary is just to enlarge the degree of the bending, so that the submanifold 5b.
- the liquid discharge head 2 is manufactured as follows, for example.
- a tape composed of a piezoelectric ceramic powder and an organic composition is formed by a general tape forming method such as a roll coater method or a slit coater method, and a plurality of green sheets that become piezoelectric ceramic layers 21a and 21b after firing are produced.
- An electrode paste to be the common electrode 24 is formed on a part of the green sheet by a printing method or the like. Further, a via hole is formed in a part of the green sheet as necessary, and a via conductor is filled in the via hole.
- each green sheet is laminated to produce a laminate, and pressure adhesion is performed.
- the laminated body after pressure contact is fired in a high-concentration oxygen atmosphere, and then the individual electrode 25 is printed on the fired body surface using an organic gold paste, fired, and then the connection electrode 26 is printed using an Ag paste.
- substrate 21 is produced by baking.
- the flow path member 4 is manufactured by laminating plates 4a to 4l obtained by a rolling method or the like via an adhesive layer. Holes to be the manifold 5, the individual supply channel 14, the pressurizing chamber 10, the descender and the like are processed into a predetermined shape by etching in the plates 4a to 4l.
- These plates 4a to 4l are preferably formed of at least one metal selected from the group of Fe—Cr, Fe—Ni, and WC—TiC, particularly when ink is used as a liquid. Since it is desired to be made of a material having excellent corrosion resistance to ink, Fe—Cr is more preferable.
- the piezoelectric actuator substrate 21 and the flow path member 4 can be laminated and bonded through an adhesive layer, for example.
- a well-known adhesive layer can be used as the adhesive layer, but in order not to affect the piezoelectric actuator substrate 21 and the flow path member 4, an epoxy resin or a phenol resin having a thermosetting temperature of 100 to 150 ° C. It is preferable to use at least one thermosetting resin adhesive selected from the group of polyphenylene ether resins. By heating to the thermosetting temperature using such an adhesive layer, the piezoelectric actuator substrate 21 and the flow path member 4 can be heat-bonded. After joining, a voltage is applied between the common electrode 24 and the individual electrode 25 to polarize the piezoelectric ceramic layer 21b in the thickness direction.
- a silver paste is supplied to the connection electrode 26, an FPC which is a signal transmission unit 92 on which a driver IC is mounted in advance is placed, and heat is applied.
- the silver paste is cured and electrically connected.
- the driver IC was mounted by electrically flip-chip connecting the FPC to the FPC with solder, and then supplying a protective resin around the solder and curing it.
- the reservoir is bonded so that the liquid can be supplied from the opening 5a, the metal housing is screwed, and then the joint is sealed with a sealant, whereby the liquid discharge head 2 is Can be produced.
Abstract
Description
2・・・液体吐出ヘッド
2a・・・ヘッド本体
4・・・流路部材
4a~m、704e・・・(流路部材の)プレート
4-1・・・吐出孔面
4-2・・・加圧室面
5・・・マニホールド
5a・・・(マニホールドの)開口
5b・・・副マニホールド
705b-1・・・副マニホールドとなる孔
6・・・しぼり
8・・・吐出孔
9・・・吐出孔列
10・・・加圧室
11・・・加圧室列
12・・・個別流路
14・・・個別供給流路
15・・・隔壁
715-1・・隔壁となる部位
16・・・ダミー加圧室
21・・・圧電アクチュエータ基板
21a・・・圧電セラミック層(振動板)
21b・・・圧電セラミック層
24・・・共通電極
25・・・個別電極
25a・・・個別電極本体
25b・・・引出電極
26・・・接続電極
28・・・共通電極用表面電極
30・・・変位素子(加圧部)
Claims (17)
- 複数の吐出孔、該複数の吐出孔とそれぞれ繋がっている複数の加圧室、および前記複数の加圧室に液体を供給するマニホールドを有する一方方向に長い流路部材と、
該流路部材に接合されており、前記複数の加圧室の体積をそれぞれ変化させる複数の加圧部とを備えている液体吐出ヘッドであって、
前記流路部材を平面視したとき、前記マニホールドは、前記流路部材の一端部側から他端部側にまで延在しているとともに、前記流路部材の両端部で外部に開口しており、かつ前記一方方向に長い隔壁で、複数の副マニホールドに仕切られており、1つの前記副マニホールドに繋がっている前記加圧室は、当該副マニホールドに沿って並んだ2つの加圧室列を構成しており、前記加圧室列に属する加圧室は、当該加圧室列に隣接する前記加圧室列に属する加圧室と前記一方方向において重ならないことを特徴とする液体吐出ヘッド。 - 前記流路部材は平板状であり、前記複数の加圧室が前記流路部材の一方の主面に開口しており、前記2つの加圧室列に属する加圧室に繋がっている前記吐出孔が、それぞれ当該副マニホールドに沿って配置されて、前記流路部材の他方の主面に開口していることを特徴とする請求項1に記載の液体吐出ヘッド。
- 前記流路部材は、複数のプレートが積層されて構成されており、前記複数の副マニホールドとなる孔が開口している1つまたは複数の前記プレートにおいて、隣り合う副マニホールドは、前記1つまたは複数のプレートの前記隔壁となる部分で完全に仕切られていることを特徴とする請求項2に記載の液体吐出ヘッド。
- 前記流路部材を平面視したとき、1つの前記副マニホールドに前記加圧室を介して繋がっている前記吐出孔は、当該副マニホールドに隣接する他の前記副マニホールドに前記加圧室列を介して繋がっている吐出孔よりも、当該副マニホールドの近くに開口していることを特徴とする請求項2または3に記載の液体吐出ヘッド。
- 前記流路部材を平面視したとき、前記複数の加圧室は、加圧室の面積に対する当該加圧室の前記副マニホールドと重なっている領域の面積の割合がそれぞれ略同じであることを特徴とする請求項1~4のいずれかに記載の液体吐出ヘッド。
- 前記隔壁の幅が前記副マニホールドの幅よりも小さいことを特徴とする請求項1~5に記載の液体吐出ヘッド。
- 前記複数の副マニホールドの前記隔壁は、連続して積層されている4枚以上のマニホールドプレートで構成されており、
前記4枚以上のマニホールドプレートのそれぞれは、前記複数の副マニホールドとなる孔、前記隔壁となる仕切り部、および前記複数の副マニホールドとなる孔を幅方向に横切るように設けられている支持部を備えており、
1つの前記副マニホールド内には、前記支持部が前記一方方向に複数個並んで配置されている支持部群が配置されており、
該支持部群は、前記マニホールドプレートの積層方向における前記副マニホールドの高さの半分より上側に位置している上側支持部群と、前記副マニホールドの積層方向の高さの半分より下側に位置している下側支持部群とに、前記一方方向に分かれて配置されており、かつ前記上側支持部群と前記下側支持部群との前記一方方向の境界を挟んで隣り合っている2つの前記支持部を備えている前記マニホールドプレート同士は、間に他の前記マニホールドプレートを介して積層されていることを特徴とする請求項1~6のいずれかに記載の液体吐出ヘッド。 - 前記上側支持部群に属しており、前記一方方向に隣り合っている2つの前記支持部を備えている前記マニホールドプレート同士が直接積層されており、前記下側支持部群に属しており、前記一方方向に隣り合っている2つの前記支持部を備えている前記マニホールドプレート同士が直接積層されていることを特徴とする請求項7に記載の液体吐出ヘッド。
- 前記副マニホールド内で前記一方方向に沿って液体が流れる方向に対して、前記上側支持部群に属する支持部は、前記副マニホールドの上面からの距離が増えるように配置されており、前記下側支持部群に属する支持部は、前記副マニホールドの下面からの距離が増えるように配置されていることを特徴とする請求項8に記載の液体吐出ヘッド。
- 前記副マニホールド内には、前記上側支持部群と前記下側支持部群とが前記一方方向に交互に配置されており、全ての前記上側支持部群と前記下側支持部群との境界を挟んで隣り合っている2つの前記支持部を備えている前記マニホールドプレート同士は、間に他の前記マニホールドプレートを介して積層されていることを特徴とする請求項7~9のいずれかに記載の液体吐出ヘッド。
- 前記上側支持部群と前記下側支持部群との境界を挟んで隣り合っている2つの前記支持部の間の積層方向の距離が、前記副マニホールドの積層方向の高さの半分以上であることを特徴とする請求項7~10のいずれかに記載の液体吐出ヘッド。
- 前記副マニホールドの上面に、前記複数の吐出孔に繋がっている流路が設けられており、
積層方向の最も上に位置する前記支持部を除いた前記上側支持部群に属する支持部は、当該支持部を備えている前記マニホールドプレートよりも薄く、かつ下端が当該マニホールドプレートの下面よりも上に位置しており、
前記下側支持部群に属する支持部、および積層方向の最も上に位置する前記支持部は、当該支持部を備えている前記マニホールドプレートよりも薄く、かつ上端が当該マニホールドプレートの上面よりも下に位置していることを特徴とする請求項7~11のいずれかに記載の液体吐出ヘッド。 - 前記副マニホールドの上面に、前記複数の吐出孔に繋がっている流路が設けられているとともに、前記副マニホールドの下面が、当該マニホールドの体積を変えるように変形可能なダンパとなっており、
積層方向の最も上に位置する前記支持部を除いた前記上側支持部群に属する支持部、および積層方向の最も下に位置する前記支持部は、当該支持部を備えている前記マニホールドプレートよりも薄く、かつ下端が当該マニホールドプレートの下面よりも上に位置しており、
積層方向の最も下に位置する前記支持部を除いた前記下側支持部群に属する支持部、および積層方向の最も上に位置する前記支持部は、当該支持部を備えている前記マニホールドプレートよりも薄く、かつ上端が当該マニホールドプレートの上面よりも下に位置していることを特徴とする請求項7~11のいずれかに記載の液体吐出ヘッド。 - 前記加圧部は、共通電極と圧電セラミック層と個別電極とがこの順に積層されている前記一方方向に長い圧電アクチュエータ基板に設けられている、前記共通電極、前記個別電極、および前記共通電極と前記個別電極とに挟まれている前記圧電セラミック層を含む変位素子であり、前記加圧室および前記個別電極が、前記一方方向に沿った対角線を有する菱形形状であり、前記個別電極は前記一方方向および当該一方方向に直交する方向に沿った行および列をなす格子上に配置されていることを特徴とする請求項1~13のいずれかに記載の液体吐出ヘッド。
- 前記圧電アクチュエータ基板は、前記流路部材上に一つ設けられていることを特徴とする請求項14に記載の液体吐出ヘッド。
- 前記圧電アクチュエータ基板は、前記圧電セラミック層上に設けられた共通電極用表面電極、および前記圧電セラミック層内に設けられ、前記共通電極用表面電極と前記共通電極とを接続するビアホール導体をさらに備えており、前記流路部材は、前記流路部材を平面視したとき、前記圧電アクチュエータ基板と重なるように偶数個の前記マニホールドを備えており、前記共通電極用表面電極および前記ビアホール導体が偶数個ある前記マニホールドの前記一方方向に直交する方向の中央部に設けられていることを特徴とする請求項14または15に記載の液体吐出ヘッド。
- 請求項1~16のいずれかに記載の液体吐出ヘッドと、記録媒体を前記液体吐出ヘッドに対して搬送する搬送部と、前記複数の加圧部を制御する制御部を備えていることを特徴とする記録装置。
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US14/128,584 US8944572B2 (en) | 2011-06-28 | 2012-06-27 | Liquid discharge head and recording device using same |
JP2013522899A JP5997150B2 (ja) | 2011-06-28 | 2012-06-27 | 液体吐出ヘッド、およびそれを用いた記録装置 |
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