JP2013010332A - Liquid ejection head, liquid ejection head block using the same, and recording device - Google Patents

Abstract

A liquid discharge head that can be easily attached to a recording apparatus, a liquid discharge block using the liquid discharge head, and a recording apparatus.
A first positioning portion 238a and a second positioning portion 238b having a convex portion on one side, and a third positioning portion 238c and a stopper portion 238d having a concave portion on a side different from the one side are provided. A liquid discharge head;
[Selection] Figure 6

Description

  The present invention relates to a liquid discharge head that discharges liquid droplets, a liquid discharge head block that uses a plurality of liquid discharge heads, and a recording apparatus.

  In recent years, 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.

  In such an ink jet printing apparatus, 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.

  In addition, in such a liquid discharge head, 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 There is 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.

  Accordingly, a long liquid discharge head in one direction is provided so as to cover the manifold (common flow path) and the flow path member having discharge holes that connect the manifold through a plurality of pressure chambers, respectively, and the pressure chamber. In addition, an actuator unit that includes a plurality of actuator units having a plurality of displacement elements is known (see, for example, Patent Document 1). In this liquid ejection head, 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. Thus, printing is possible at a resolution of 600 dpi in the main scanning direction.

  Patent Document 1 describes that a plurality of liquid discharge heads are used side by side in a printer.

JP 2003-305852 A

  However, in the case where a plurality of liquid discharge heads as described in Patent Document 1 are attached to a recording apparatus and used, in order to obtain a good printing result, these liquid discharge heads are set relative to each liquid discharge head. It was necessary to align and attach each position so that the position was within a predetermined accuracy, and the work was complicated.

  Accordingly, it is an object of the present invention to provide a liquid discharge head in which a recording apparatus can be easily attached, a liquid discharge block using the same, and a recording apparatus.

  The liquid discharge head according to the present invention includes first and second positioning portions having a convex portion on one side, and a third positioning portion and a stopper portion having a concave portion on a side different from the one side. And

  The liquid discharge head block according to the present invention is a liquid discharge head block having two liquid discharge heads and a position adjustment jig sandwiched between the two liquid discharge heads. The jig is configured so that the positions of the ejection holes of the two liquid ejection heads are shifted by a predetermined distance in the one direction as compared with the case where the position adjusting jig is not sandwiched between the jigs. It is characterized by.

  In the recording apparatus of the invention, a plurality of the liquid discharge heads are arranged using the first to third positioning portions and the stopper portion, or arranged using the position adjusting jig. The liquid ejection head block includes a transport unit that transports a recording medium to the liquid ejection head block, and a control unit that controls the liquid ejection head.

  When a plurality of liquid ejection heads are attached to the recording apparatus, relative positioning between the liquid ejection heads can be easily performed.

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. It is a longitudinal cross-sectional view along the VV line of FIG. (A) is a schematic diagram which shows the arrangement | positioning state of a discharge hole and each positioning part, (b), (c) is a schematic diagram which shows the state which aligned two liquid discharge heads. (A) is a schematic diagram illustrating a state in which two liquid ejection heads are aligned, and (b) is a schematic diagram illustrating a state in which three liquid ejection heads are aligned. It is a schematic diagram of the liquid discharge head block of this embodiment.

FIG. 1 is a schematic configuration diagram of a color ink jet 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 a liquid discharge head block 32 to which two liquid discharge heads 2 are fixed. The liquid discharge head block 32 can be moved in a direction from the front to the back in FIG. The two liquid discharge heads 2 have an elongated shape that is elongated in the direction along the conveyance path of the printing paper P. This long direction is sometimes called the longitudinal direction. In the liquid discharge head block 32, the four liquid discharge heads are arranged in parallel in the direction from the front to the back in FIG. Since the liquid discharge head 2 of the present invention can be positioned by bringing the positioning portions provided in the liquid discharge head 2 into contact with each other, the relative positional accuracy of the two liquid discharge heads 2 is increased. The printer 1 can be attached. Details of the positioning portion provided in the liquid discharge head 2 will be described later.

  In the printer 1, a paper feed unit 114, a transport unit 120, and a paper receiver 116 are sequentially provided along the transport path of the printing paper P. In addition, 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 supply 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.

  Between the paper feed unit 114 and the transport unit 120, 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 such a length that it is stretched with a predetermined tension when it is wound around two belt rollers. Thus, 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.

  As shown in FIG. 1, 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.

  In the vicinity of the belt roller 107, 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.

  Four color liquid droplets (inks) are ejected from ejection holes provided in one liquid ejection head 2. The ejection holes for ejecting each color of the liquid ejection head 2 are arranged at equal intervals 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). Therefore, each color can be printed without any gap in one direction. The colors of the liquid discharged from the liquid discharge head 2 are, for example, magenta (M), yellow (Y), cyan (C), and black (K), respectively. The liquid discharge head 2 is disposed with a slight gap between the discharge hole surface 4-1 on the lower surface of the head body 2 a 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, the conveyance of the printing paper P is temporarily stopped, and the liquid ejection head block 32 is moved across the width direction of the printing paper P in a direction substantially perpendicular to the conveyance direction of the printing paper P. Droplets are ejected from the head main body 2a constituting the liquid ejection head 2 in the block 32 toward the upper surface of the printing paper P. From each of the two liquid discharge heads 2, in each color, a droplet discharged from the second liquid discharge head 2 lands between the droplets discharged from the first liquid discharge head 2 and landing. By doing so, printing is performed at a resolution that is twice the resolution of one liquid ejection head 2. As a result, a color image corresponding to the width in the longitudinal direction of the liquid ejection head 2 is formed on the upper surface of the printing paper P. Thereafter, the printing paper P is conveyed by the length of the width in the longitudinal direction of the liquid ejection head 2. By repeating these, a color image based on the image data stored by the control unit 100 is formed. In order to perform such printing, it is necessary to increase the relative positional accuracy of the two liquid ejection heads 2. For this purpose, the liquid ejection heads 2 are positioned by being brought into contact with each other. The positioning part which can do is provided.

  A separation plate 140 and two pairs of feed rollers 121a and 121b and 122a and 122b are arranged between the transport unit 120 and the paper receiver 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. Then, 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.

  Note that a paper surface sensor 133 is installed between the liquid ejection head 2 and the nip roller 138 that are the most upstream in the transport 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.

  Next, the liquid discharge head 2 of the present invention will be described. FIG. 2 is a plan view of the head main body 2a. FIG. 3 is an enlarged view of a region surrounded by a one-dot chain line in FIG. 2, and is a diagram in which some of the flow paths are omitted for explanation. FIG. 4 is an enlarged view of a region surrounded by a one-dot chain line in FIG. 2, and is a diagram in which a part of the flow path different from FIG. 5 is omitted for explanation. 3 and 4, for easy understanding of the drawings, the manifold 5, the discharge hole 8, and the pressurizing chamber 10 that are to be drawn by broken lines below the piezoelectric actuator substrate 21 are drawn by solid lines. FIG. 3 is a longitudinal sectional view taken along the line VV in FIG.

The flow path member 4 constituting the head body 2a includes a manifold 5, a plurality of pressurizing chambers 10 connected to the manifold 5, and a plurality of discharge holes 8 connected to the plurality of pressurizing chambers 10, respectively. The pressurizing chamber 10 opens to the upper surface of the flow path member 4, and the upper surface of the flow path member 4 is the pressurizing chamber surface 4.
-2. In addition, 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 bonded to the upper surface of the flow path member 4, and each displacement element 30 is provided so as to be positioned on the pressurizing chamber 10. The piezoelectric actuator substrate 21 is connected to a signal transmission unit such as an FPC (Flexible Printed Circuit) for supplying a signal to each displacement element 30. A driver IC is mounted on the signal transmission unit. The driver IC is mounted so as to be pressed against the metal casing of the liquid discharge head 2, 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 generation of the drive signal is generated by the control unit 100 and is input from the end of the signal transmission unit opposite to the side connected to the piezoelectric actuator substrate 21. A wiring board or the like provided in the liquid ejection head 2 is provided between the control unit 100 and the signal transmission unit as necessary.

  The head body 2 a has a flat plate-like flow path member 4 and one piezoelectric actuator substrate 21 including a displacement element 30 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.

  Four manifolds 5 are 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 openings 5 a of the manifold 5 are formed on the upper surface of the flow path member 4 at both ends thereof. In the present embodiment, four manifolds 5 are provided independently, and each manifold 5 is connected to the branch flow path 52 at the opening 5a.

  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 opens to the pressurizing chamber surface 4-2 that is the upper surface of the flow path member 4.

  The pressurizing chamber 10 is connected to one manifold 5 via an individual supply channel 14. Along the one manifold 5, two pressurizing chamber rows 11, which are rows of pressurizing chambers 10 connected to the manifold 5, are provided on each side of the manifold 5, for a total of four rows. Therefore, a total of 16 pressurizing chamber rows 11 are provided. The intervals in the longitudinal direction of the pressurizing chambers 10 in the respective pressurizing chamber rows 11 are the same, and the interval is 37.5 dpi. The pressurization chamber 10 at the end of each pressurization chamber row 11 is a dummy and is not connected to the manifold 5. By this dummy, the structure (rigidity) around the pressurizing chamber 10 that is one inner side from the end is close to the structure (rigidity) of the other pressurizing chamber 10, so that the difference in liquid ejection characteristics can be reduced.

  The pressurizing chambers 10 of each pressurizing chamber row 11 are arranged in a staggered manner so that the corners are located between the adjacent pressure chamber rows 11. A pressurizing chamber group is constituted by the pressurizing chambers 10 connected to one manifold 5, and there are four pressurizing chamber groups. The relative arrangement of the pressurizing chambers 10 in each pressurizing chamber group is the same, and each pressurizing chamber group is arranged slightly shifted in the longitudinal direction. These pressurizing chambers 10 are arranged over almost the entire surface of the upper surface of the flow path member 4 in a region facing the piezoelectric actuator substrate 21, although there are some widened portions such as between the pressurizing chamber groups. . 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 discharge holes 8 opened on the discharge hole surface 4-1 constitute a discharge hole group 36 that is long in one direction. 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 8 in the longitudinal direction and the arrangement of the pressurizing chamber 10 are the same. In each pressurizing chamber row 11, the pressurizing chambers 10 are arranged at an interval of 37.5 dpi, and the pressurizing chambers 10 connected to one manifold 5 as a whole have an interval of 150 dpi in the longitudinal direction. Further, since the pressurizing chambers 10 connected to the four manifolds 5 are displaced in the longitudinal direction at an interval corresponding to 600 dpi, the liquid pressurizing chambers 10 are formed at an interval of 600 dpi in the longitudinal direction as a whole. ing. As described above, since the arrangement of the discharge holes 8 in the longitudinal direction is the same as that of the liquid pressurizing chamber 10, the distance between the discharge holes 8 in the longitudinal direction is also 600 dpi.

  In other words, when the discharge holes 8 are projected so as to be orthogonal to the virtual straight line parallel to the longitudinal direction of the flow path member 4, each manifold 5 is within the range of R of the virtual straight line shown in FIG. That is, four discharge holes 8 connected to, that is, a total of 16 discharge holes 8 are equally spaced at 600 dpi. Thus, by supplying the same color ink to all the manifolds 5, it is possible to form an image with a resolution of 600 dpi in the longitudinal direction as a whole. In addition, the four discharge holes 8 connected to one manifold 5 are equally spaced at 150 dpi in the range of the imaginary straight line R. As a result, by supplying different colors of ink to the respective manifolds 5, it is possible to form four-color images with a resolution of 150 dpi in the longitudinal direction as a whole. In this case, four color images may be formed at a resolution of 600 dpi by using four liquid discharge heads 2 so that each color ink is supplied to the manifold 5 at a different position. . Furthermore, four color images may be formed with a resolution of 300 dpi by using two liquid discharge heads 2 so that each color ink is supplied to the manifold 5 at a different position in the liquid discharge head 2. By doing so, the same color inks arranged in the main scanning direction on the recording medium P are ejected from different liquid ejection heads 2 and the positions of the manifolds 5 in the liquid ejection heads 2 are the same. Since they are different from each other, it is difficult to cause the same variation in the ejection characteristics reflecting the variation in the liquid ejection characteristics generated for each liquid ejection head 2 and the variation caused by the position of the manifold 5 in each liquid ejection head 2. A beautiful image can be obtained.

  Alternatively, two liquid ejection heads 2 may be arranged in parallel and alternately printed on the recording paper P so that printing can be performed at twice the speed of one liquid ejection head 2.

  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. In the same manner as the pressurizing chamber 10, the individual electrode 25 constitutes an individual electrode row and an individual electrode group. A common electrode surface electrode 28 electrically connected to the common electrode 24 is formed on the upper surface of the piezoelectric actuator substrate 21. 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. Two signal transmission units 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 common electrode surface electrode 28 is connected at the end of the signal transmission unit (the tip and the longitudinal end of the piezoelectric actuator substrate 21), and the common electrode surface electrode 28 and the common electrode connection electrode formed thereon are provided. Since the area is larger than that of the extraction electrode 25b and the connection electrode 26 formed on the extraction electrode 25b, the signal transmission part can be hardly separated from the end.

  Further, 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 main body 2a 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 4, a cavity plate 4a, a base plate 4b, an aperture plate 4c, a supply plate 4d, manifold plates 4e-g, a cover plate 4h, a cover SP plate 4i, and a nozzle plate 4j. It is. A number of holes are formed in these plates. Since the thickness of each plate is about 10 to 300 μm, 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. In the head main body 2a, 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 respective parts constituting the individual flow path 12 are close to each other. 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. Second, there is a communication hole that constitutes an individual supply channel 14 that is connected from one end of the pressurizing chamber 10 to the manifold 5. 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.

Third, there is a communication hole constituting a flow path communicating 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 4j (specifically, the discharge hole 8). The holes of the nozzle plate 4j are formed as the discharge holes 8 having a diameter of 10 to 40 μm, for example, that is open to the outside of the flow path member 4 and the diameter increasing toward the inside.
Fourthly, communication holes constituting the manifold 5. The communication holes are formed in the manifold plates 4e to 4g.

  Fifth, it is a hole that is formed in the cover SP plate 4 i and serves as a damper chamber 18 formed under the manifold 5. The damper chamber 18 is not connected to the first to fourth holes described above and does not allow liquid to enter. The cover plate 4h between the damper chamber 18 and the manifold 5 serves as a damper. By changing the volume of the manifold 5, the excess or shortage of the liquid supply of the manifold 5 makes it difficult for the discharge to be affected. The pressure is transmitted between the pressurizing chambers 10 to reduce the crosstalk that affects the discharge characteristics. Even if the damper chamber 18 is a hermetically sealed space, the damper is activated by the volume change of the air. However, if the damper chamber 18 is connected to the outside of the flow path member 4 by a hole different from the above-described hole. Work better as a damper.

The first to fourth communication holes are connected to each other to form an individual flow path 12 extending from the liquid inflow port (outlet of the manifold 5) 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 passes through the individual supply channel 14 and reaches one end of the aperture 6. Next, it proceeds horizontally along the extending direction of the restriction 6 and reaches the other end of the restriction 6. 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.

  Similarly to the flow path member 4, the branch flow path member 51 is obtained by a rolling method or the like, and is processed into a predetermined shape by etching or grinding and laminated and adhered to the plates 51a to 51c. A recess serving as a pressurizing part accommodating part 54 is provided. The thickness of the plates 51a to 51c is, for example, about 0.3 to 3m.

  The piezoelectric actuator substrate 21 has a laminated structure composed of two piezoelectric ceramic layers 21a and 21b. Each of these piezoelectric ceramic layers 21a and 21b has a thickness of about 20 μm. 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 μm. Both of the piezoelectric ceramic layers 21 a and 21 b extend so as to straddle the plurality of pressure chambers 10. The piezoelectric ceramic layers 21a and 21b are made of a lead zirconate titanate (PZT) ceramic material having ferroelectricity.

  The piezoelectric actuator substrate 21 includes 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. As described above, the individual electrode 25 includes the individual electrode main body 25a disposed at a 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 μm. The connection electrode 26 is electrically joined to an electrode provided in the signal transmission unit. Although details will be described later, a drive signal is supplied to the individual electrode 25 from the control unit 100 through the signal transmission unit. The drive signal is supplied in a constant cycle in synchronization with the conveyance speed of the print medium P. The dummy connection electrode 27 connects the piezoelectric actuator substrate 21 and the signal transmission unit to increase the connection strength, uniformize the distribution of the portion connected on the piezoelectric actuator substrate 21, and stabilize the connection when connecting. You can.

  The common electrode 24 is formed over almost the entire surface in the region 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 μm. 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 in the same manner as the large number of individual electrodes 25.

As will be described later, when a predetermined drive signal is selectively supplied to the individual electrode 25, pressure is applied to the liquid in the pressurizing chamber 10 corresponding to the individual electrode 25. As a result, droplets are discharged from the corresponding liquid discharge ports 8 through the individual flow paths 12. That is, the portion of the piezoelectric actuator substrate 21 that faces each pressurizing chamber 10 corresponds to the individual displacement element 30 corresponding to each pressurizing chamber 10 and the liquid discharge port 8. That is, in the laminated body composed of two piezoelectric ceramic layers, the displacement element 30 which is a piezoelectric actuator having a unit structure as shown in FIG. Is formed by a diaphragm 21a, a common electrode 24, a piezoelectric ceramic layer 21b, and an individual electrode 25. The piezoelectric actuator substrate 21 includes a plurality of displacement elements 30 serving as pressure parts. In this embodiment, the amount of liquid discharged from the liquid discharge port 8 by one discharge operation is 5 to 7 pl (
Picoliter).

  The large number of individual electrodes 25 are individually electrically connected to the control unit 100 via signal transmission units and wires so that the potentials can be individually controlled. When 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. In this configuration, when 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. On the other hand, 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. As a result, 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).

In an actual driving procedure in the present embodiment, 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. As a result, the piezoelectric ceramic layers 21a and 21b return to their original shapes at the timing when the individual electrodes 25 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. At this time, 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. After that, at the timing when the individual electrode 25 is set to a high potential again, 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, 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. According to this, when the inside of the pressurizing chamber 10 is reversed from the negative pressure state to the positive pressure state, both pressures are combined, and the liquid droplets can be discharged at a stronger pressure.

  In gradation printing, 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. In general, when liquid ejection is performed continuously, it is preferable that the interval between pulses supplied to eject liquid droplets is AL. As a result, 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. Thus, 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 liquid ejection head 2 and the liquid ejection head block 32 having a plurality of liquid ejection heads 2 provided in the printer 1 have been described above. When printing using a plurality of liquid ejection heads 2, liquid droplets ejected from the plurality of liquid ejection heads 2 are mixed and landed to form an image. When mounting to 1, it is often preferable that the relative positional accuracy of each liquid ejection head 2 is higher than the positional accuracy of the liquid ejection head 2 with respect to the printer 1. Therefore, in the liquid ejection head 2 of the present invention, the positions of the liquid ejection heads 2 can be positioned by contacting a positioning portion provided in the liquid ejection head 2.

In the actual structure of the liquid discharge head 2 shown in FIGS. 2 to 5, since the arrangement of the discharge holes 8 is complicated, the structure of the positioning portion and the like will be described with reference to the liquid discharge head 202 shown in FIG. In the liquid discharge head 202, the discharge holes 208 are opened in the discharge hole opening surface 204-1 and constitute a discharge hole group 236 that is long in one direction. The discharge holes 208 are arranged on the straight lines L1 to L4 that are four discharge hole arrays. The intervals between the discharge holes 208 on the straight lines L1 to L4 are equal, and the discharge holes 208 are arranged at equal intervals d (mm, hereinafter the unit may be omitted) in the longitudinal direction, whereby the discharge hole group The entire ejection holes 208 included in 236 can be printed at equal intervals d. The intervals between the straight lines L1 to L4 are equal in p (mm, hereinafter, the unit may be omitted), but they may not be equal.

  In addition, the liquid discharge head 202 includes a first positioning portion 238a, a second positioning portion 238b, a third positioning portion 238c, and a stopper portion 238d. The first to third positioning portions 238a to 238c and the stopper portion 238d may be collectively referred to as a positioning portion.

  The liquid discharge head 202 includes first and second positioning portions 238a and 238 having a convex portion on one side, and a third positioning portion 238c and a stopper portion 238d having a concave portion on a side different from the one side. By providing the two liquid ejection heads 202 having substantially the same shape, the first positioning portion 238a of one liquid ejection head 202 and the third positioning portion 238c of the other liquid ejection head 202 are brought into contact with each other. The second positioning part 238b of one liquid discharge head 202 and the stopper part 238d of the other liquid discharge head 202 are brought into contact with each other, whereby relative positioning can be performed. Thereby, the relative positional accuracy can be increased and the mounting can be simplified as compared with the case where each of the liquid discharge heads 202 is mounted on the printer 1 and positioned.

  When attaching another liquid discharge head 202 in a state where the two liquid discharge heads 202 are in contact with each other, it may be positioned and attached using a positioning portion that was not used first, You may attach by another method. If positioning is performed using a positioning portion that is not used first, positioning is performed at a site that is manufactured based on the same reference, so that the mounting accuracy can be increased.

  In FIG. 6A, the side different from the one side is the side opposite to the one side. However, the present invention is not limited to this. For example, a side different from the one side by 90 degrees is used. The third positioning portion 238c and the stopper portion 238d may be provided in any direction / part that does not overlap when the first positioning portion 238a and the second positioning portion 238b are used.

  The first and second positioning portions 238a, b are convex curved surfaces at the positions where the convex portions are positioned, and the third positioning portions 238c are the portions which are contacted when the concave portions are positioned. Is a concave curved surface, and the portion that comes into contact when positioning the stopper portion 238d is a curved surface, so that deformation when the positioning portion is brought into contact is reduced, so that the alignment accuracy can be increased. Note that the convex curved surface, concave curved surface, and curved surface referred to herein means that projections such as corners are not included, and do not mean that a locally flat portion is not included.

  Further, the convex portion is a convex curved surface that is substantially orthogonal to the discharge hole surface 204-1, and a part of the outer shape in a cross section parallel to the discharge hole surface 204-1 is an arc shape, and the third positioning portion 238c. And the stopper portion 238d have a surface substantially orthogonal to the discharge hole surface 204-1, and are brought into contact with surfaces having substantially the same shape as the convex portions of the first and second positioning portions 238a and 238b, respectively. The concave portion has a shape in which an arc-shaped portion of the convex portion defines a center of rotation that rotates along the arc shape, and the stopper portion 238d is a liquid discharge head 202 that rotates at the center of rotation. The relative position of the two liquid discharge heads 202 is determined without play and positioning can be performed.

  The shape that determines the center of rotation in the third positioning portion 238c is a cross section parallel to the discharge hole surface 204-1, and two or more points are placed on one of the first and second positioning portions 238a, b in the arc shape. By making contact at points (a straight line orthogonal to the discharge hole surface 204-1 in three dimensions), it is possible to rotate with respect to the center point of the arc shape while each point is in contact. It is what. The abutting portion may be a line having a continuous point shape (a plane perpendicular to the discharge hole surface 204-1 in three dimensions). When the contact is made at three or more points, the center slightly shifts depending on which two points are made to contact strongly. Therefore, the contact points are preferably two points. The abutting point in the concave portion can be reduced in deformation when abutted surfaces are brought into contact with each other, so that the positional accuracy can be increased. If the two abutting portions are straight in the cross section parallel to the discharge hole surface 204-1, the processing accuracy can be easily improved, so that the positional accuracy can be increased. In this case, if the angle formed by the straight lines of the two abutting portions (in three dimensions, the plane orthogonal to the discharge hole surface 204-1) is approximately 90 degrees, the direction of the force when attempting to abut one of them However, since the position of the other abutting portion is difficult to shift, positional displacement due to the abutting operation hardly occurs, and the position accuracy can be increased.

  The shape that determines the angle of the liquid discharge head 202 that rotates at the center of rotation in the stopper portion 238d is, for example, the third positioning portion 238c and the first and second circular arc shapes in the cross section parallel to the discharge hole surface 204-1. The liquid discharge head 202 that is rotatable in an arc shape in a state where any one of the positioning portions 238a, b is in contact with the stopper 238d, and the first and second positioning portions 238a, b in the arc shape. The angle of rotation is determined by abutting against any one of the above. The abutting portion may be a line (a three-dimensional plane orthogonal to the discharge hole surface 204-1) or two or more points (a three-dimensional line orthogonal to the discharge hole surface 204-1). By abutting at a point, the influence of accuracy when the shape of the stopper portion 238d is processed is less likely to affect positioning, so that the position accuracy can be increased. The point of contact can be improved in positional accuracy because the non-cornered surfaces are brought into contact with each other, so that deformation at the time of contact is reduced. If the portion where the stopper portion 238d abuts is a straight line in the cross section parallel to the discharge hole surface 204-1, the processing accuracy can be easily improved, so that the positional accuracy can be increased. The first and second positioning portions 238a that are in contact with the stopper portion 238d when the liquid discharge head 202 is rotated are the straight lines of the contact portions (in three dimensions, the plane orthogonal to the discharge hole surface 204-1). , B is orthogonal to the direction of movement, the rotation axis is difficult to shift when abutting, so that the positional accuracy can be increased.

  If the positioning of the printer 1 and the liquid discharge head 202 is performed using a positioning unit that is not used for alignment with the other liquid discharge heads 202, unified positioning can be performed, so that the positional accuracy can be increased. .

  Further, the discharge hole surface 204-1 has a rectangular shape that is long in one direction, and the first and second positioning portions 238a, b are located on one long side of the rectangular shape, and the third positioning portion Since 238c and stopper portion 238d are positioned on the other long side of the rectangular shape, two or more liquid ejection heads 202 can be aligned and aligned. Moreover, if each positioning part is provided near the both ends of the rectangular shape or outside the both ends, the angle of the rectangular discharge hole surface 204-1 can be determined more accurately.

  FIGS. 6B and 6C show a state in which the two liquid discharge heads 202 are brought into contact with each other and positioned. In any case, the two liquid discharge heads 202 are arranged in the short direction, and in the drawing, the third positioning portion 238c of the upper liquid discharge head 202 and the first positioning portion 238a of the lower liquid discharge head 202 are shown. And the stopper portion 238d of the upper liquid discharge head 202 and the second positioning portion 238b of the upper liquid discharge head 202 are brought into contact with each other.

  In FIG. 6B, the positions of the ejection holes 208 of the upper liquid ejection head 202 and the ejection holes 208 of the lower liquid ejection head 202 are the same in the longitudinal direction. In this way, for example, multicolor printing can be performed by landing inks of different colors at the same longitudinal point on the recording paper P. Further, for example, the printing speed can be increased by causing the different liquid discharge heads 202 to alternately land in the short direction at the same longitudinal point on the recording paper P. In FIG. 6B, the positions of the discharge hole groups 236 of the two liquid discharge heads 202 in the longitudinal direction are the same, but this is not always necessary, and the positions of the discharge hole groups 236 in the longitudinal direction are not necessarily required. It may be shifted by an integral multiple of d. When printing with the liquid discharge heads 202 arranged in the longitudinal direction, the difference in the discharge characteristics between the different liquid discharge heads 202 is reduced on the recording paper P by preventing the ends of the discharge hole groups 236 from being aligned. Can be made inconspicuous. When the liquid discharge heads 202 are not arranged in the longitudinal direction, the print range can be widened by aligning the ends of the discharge hole group 236.

  In FIG. 6C, the positions of the discharge holes 208 of the upper liquid discharge head 202 and the discharge holes 208 of the lower liquid discharge head 202 are shifted by d / 2 in the longitudinal direction. In this way, for example, the resolution in the longitudinal direction on the recording paper P can be doubled. Furthermore, the resolution in the longitudinal direction can be increased by n times by making n (n is an integer of 2 or more) liquid ejection heads 202 so that the positions of the ejection holes 208 are shifted by d / n in the longitudinal direction. In the drawing, the difference in the position of the discharge hole group 236 in the longitudinal direction is d / 2, but this is not always necessary, and the position of the discharge hole group 236 in the longitudinal direction is an integral multiple of d + d / 2. It may be shifted. The reason is the same as in the case of FIG.

  The liquid discharge head 302 shown in FIG. 7A is the same as the liquid discharge head 202 except for the positions of the first and second positioning portions 338a and 338b, the third positioning portion 338c, and the stopper portion 338d.

  When the two liquid discharge heads 302 are aligned in the short direction as shown in FIG. 7A and the liquid discharge head 302 is aligned with the third positioning portion 338c of the upper liquid discharge head 302 in the drawing, The first positioning portion 338a of the upper liquid discharge head 302 is brought into contact with the stopper portion 338d of the upper liquid discharge head 302 and the second positioning portion 338b of the lower liquid discharge head 302 is brought into contact with each other. Thus, the position of the discharge hole group 236 in the longitudinal direction can be made the same.

  Further, as shown in FIG. 7B, the liquid discharge heads 302 are aligned relative to each other and arranged in the short direction with respect to the two liquid discharge heads 302 arranged in the longitudinal direction. In the alignment, in the drawing, the third positioning portion 338c of the upper liquid discharge head 302 and the second positioning portion 338b of the lower one liquid discharge head 302 are brought into contact with each other, and the upper liquid discharge head 302 is brought into contact with each other. The stopper 338d and the first positioning portion 338a of the other lower liquid discharge head 302 are brought into contact with each other, so that the ends of the discharge hole group 236 are connected in the longitudinal direction. By doing so, the liquid discharge heads 302 can be aligned and arranged so that printing can be performed in a longer range in the longitudinal direction. In FIG. 7B, the discharge hole groups 236 of the different liquid discharge heads 302 are set such that the distance in the longitudinal direction between the discharge holes 208 at the extreme ends is d. The ends may overlap. In this way, the liquid ejection head 302 can perform alignment in different arrangements using the same alignment unit. The relative positioning of the two lower liquid ejection heads 302 can be performed by aligning and attaching to the printer 1 or another liquid ejection head 302.

Note that the state of FIG. 7B will be described with respect to the third positioning portion 338c and the second positioning portion 338b if only the relationship between the lower left liquid discharge head 302 and the upper liquid discharge head 302 is described. When the two liquid discharge heads 302 are arranged so that the long sides of the discharge hole surfaces 204-1 of the two liquid discharge heads 302 are substantially parallel to each other, the discharge hole group 236 of the two liquid discharge heads 302 has an end portion in the longitudinal direction. It is supposed to be connected with.

  The centers of the arc-shaped surfaces of the first and second positioning portions 338a and b and the third positioning portion 338c are arranged so that the alignment can be performed by the two methods shown in FIGS. 7 (a) and 7 (b). The center of the surface on the arc when it is brought into contact with the arc-shaped surface is located at the end of the discharge hole group 236 in the longitudinal direction.

  FIG. 8 is a schematic diagram of a liquid discharge head block 232 including two liquid discharge heads 302 arranged in the short-side direction and a position adjusting jig 239 sandwiched therebetween. The position adjusting jig 239 is in contact with the third positioning portion 238c and the stopper portion 238d of the upper liquid discharge head 202 in the drawing, and is in contact with the first and second positioning portions 238a and b of the lower liquid discharge head 202. It touches. Compared with the case where the position adjusting jig 239 is in contact with no gap therebetween, the longitudinal positions of the ejection holes 208 of the two liquid ejection heads 202 are shifted by d / 2. As a result, as shown in FIG. 6B, the position of the discharge hole 208 is shifted by a predetermined distance in the longitudinal direction using the liquid discharge head 202 provided with an alignment portion that aligns the position of the discharge hole 208. Thus, the liquid discharge head block 232 arranged in this manner can be simplified.

  The placement adjustment jig 239 is a first positioning portion having substantially the same shape as the first positioning portion 238a, the second positioning portion 238b, the third positioning portion 238c, and the stopper portion 238d of the liquid ejection head 202. By including the 239a, the second positioning portion 239b, the third positioning portion 239c, and the stopper portion 239d, the positional accuracy can be increased.

  In the present embodiment, the displacement element 30 using piezoelectric deformation is shown as the pressurizing portion. However, the present invention is not limited to this, and any other device that can pressurize the liquid in the pressurizing chamber 10 may be used. For example, the liquid in the pressurizing chamber 10 may be heated and boiled to generate pressure, or may be one using MEMS (Micro Electro Mechanical Systems).

DESCRIPTION OF SYMBOLS 1 ... Printer 2, 202, 302 ... Liquid discharge head 2a ... Head main body 4 ... Channel member 4a-j ... (of channel member) Plate 4-1, 204-1 ..Discharge hole surface 4-2 ... Pressure chamber surface 5 ... Manifold 5a ... (Manifold) opening 6 ... Through 8 ... Discharge hole 9 ... Discharge hole array 10 .... Pressurizing chamber 11: Pressurizing chamber array 12: Individual flow path 14: Individual supply flow path 21: Piezoelectric actuator substrate 21a: Piezoelectric ceramic layer (vibrating plate)
21b ... Piezoceramic layer 24 ... Common electrode 25 ... Individual electrode 25a ... Individual electrode body 25b ... Extraction electrode 26 ... Connection electrode 27 ... Dummy connection electrode 28 ... Common Electrode surface electrode 30 ... Displacement element (pressure part)
32, 232 ... Liquid ejection head block 36, 236 ... Discharge hole group 238a, 338a ... 1st positioning part 238b, 338b ... 2nd positioning part 238c, ss8c ... 3rd Life deciding part 238d, 338d ... stopper part 239 ... position adjusting jig 239a ... first positioning part 239b (of jig) second positioning part 239c ...・ Third positioning part (of jig) 238d ... (of jig) stopper part

Claims (9)

  A liquid discharge head comprising first and second positioning portions having a convex portion on one side, and a third positioning portion and a stopper portion having a concave portion on a side different from the one.   The first and second positioning portions are characterized in that the convex portion is a convex curved surface, the third positioning portion is such that the concave portion is a concave curved surface, and the stopper portion has a curved surface. The liquid discharge head according to 1.   A plurality of discharge holes having a discharge hole surface that is open, the convex portion being substantially orthogonal to the discharge hole surface, and a part of the outer shape in a cross section parallel to the discharge hole surface being an arc shape The concave portion and the stopper portion of the third positioning portion are surfaces that are substantially orthogonal to the discharge hole surface, and have substantially the same shape as the convex portions of the first and second positioning portions. Each of the recesses has a shape that determines the center of rotation when they are brought into contact with each other, and the stopper has a shape that determines the angle of the liquid discharge head that rotates at the center of rotation. The liquid discharge head according to claim 1, wherein the liquid discharge head is a liquid discharge head.   The discharge hole surface has a rectangular shape that is long in one direction, the first and second positioning portions are positioned on one long side of the rectangular shape, and the third positioning portion and the stopper portion are The liquid discharge head according to claim 1, wherein the liquid discharge head is located on the other long side of the rectangular shape.   The plurality of discharge holes constitute a discharge hole group that opens at a predetermined interval in the one direction, and the first to third positioning portions and the stopper portion include two liquid discharge heads. When the first positioning portion and the third positioning portion are brought into contact with each other and when the second positioning portion and the stopper portion are brought into contact with each other, the discharge holes of the two liquid discharge heads The positions in the one direction are arranged at the same position or at a position shifted by 1 / n (n is an integer of 2 or more) of the predetermined interval. Liquid discharge head.   The plurality of discharge holes constitute a discharge hole group that opens at a predetermined interval in the one direction, and the first to third positioning portions and the stopper portion include two liquid discharge heads. When the first positioning portion and the third positioning portion are brought into contact with each other and when the second positioning portion and the stopper portion are brought into contact with each other, the discharge holes of the two liquid discharge heads Are arranged so that the positions in the one direction are the same, and the two liquid discharge heads are brought into contact with each other between the third positioning portion and the second positioning portion. When the long sides of the discharge hole surfaces of the discharge heads are arranged so as to be substantially parallel, the discharge hole groups of the two liquid discharge heads are arranged so as to be connected at the end portions in the one direction. That features Liquid discharge head according to claim 4.   A liquid discharge head block having two liquid discharge heads according to claim 5 and a position adjustment jig sandwiched between the two liquid discharge heads, wherein the position adjustment jig includes: The positions of the discharge holes of the two liquid discharge heads are arranged so as to be displaced by a predetermined distance in the one direction as compared with the case where the position adjusting jig is not sandwiched between them. Characteristic liquid discharge head block.   The position adjusting jig includes a first positioning portion, a second positioning portion having substantially the same shape as the first positioning portion, the second positioning portion, the third positioning portion, and the stopper portion, respectively. The liquid discharge head block according to claim 7, further comprising a third positioning portion and a stopper portion.   A liquid discharge head block according to claim 1, wherein a plurality of the liquid discharge heads according to claim 1 are arranged using the first to third positioning portions and the stopper portion, or the liquid discharge head block according to claim 7 or 8. And a control unit that controls the liquid discharge head. The recording apparatus includes: a transfer unit that transfers the recording medium to the liquid discharge head block;

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