JP2016034739A - Liquid jet head and liquid jet device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a liquid jet head in which an electrode density is uniformized in a mounting region, with a mounting component such as a wiring board mounted.SOLUTION: A liquid jet head includes a plurality of drive elements F which jet ink from a nozzle N by applying a pressure on a pressure chamber Sc with the ink filled. The plurality of drive elements F are separated between a first element group G1 arrayed along a W1 direction, and a second element group G2 arrayed along the W1 direction on an opposite side to the first element group G1 with a mounting region Q, on which a wiring board is mounted, interposed therebetween. A plurality of first electrodes E1 connected to the respective drive elements F of the first element group G1 are arrayed along the W1 direction in a first region A1 out of the mounting region Q. A plurality of second electrodes E2 connected to the respective drive elements F, and third electrodes E3 formed between the respective second electrodes E2 adjacent to each other are arrayed along the W1 direction in a second region A2.SELECTED DRAWING: Figure 7

Description

  The present invention relates to a technique for ejecting a liquid such as ink.

  Various techniques for ejecting a liquid such as ink onto a medium such as printing paper have been proposed. For example, Patent Document 1 discloses a liquid ejecting head that drives each of a plurality of piezoelectric elements arranged in a total of two rows of a first row and a second row to eject ink in a pressure chamber from a nozzle. In a region between the first row and the second row (hereinafter referred to as “mounting region”), a plurality of piezoelectric elements for electrically connecting a plurality of piezoelectric elements to the wiring of a flexible wiring board (flexible cable) Electrodes (connection terminals) are formed.

JP2013-103429A

  The plurality of piezoelectric elements can be arranged in various manners according to the position of the nozzle corresponding to each piezoelectric element. On the other hand, each of the plurality of electrodes in the mounting region is formed at a position corresponding to each piezoelectric element. Therefore, for example, assuming a configuration in which the positions of the piezoelectric elements in the arrangement direction are different between the first row and the second row, the first row and the second row of the piezoelectric elements in the mounting region overlap each other. The electrode connected to each piezoelectric element in the first row and the electrode connected to each piezoelectric element in the second row are mixed, and the region on the end side of the mounting region includes the first row and the second row. Only the electrodes connected to each piezoelectric element on one side of the row are present, so that the density of the electrodes is different for each region in the mounting region.

  However, various problems may occur due to the density of the electrodes in the mounting area. For example, in the process of mounting a mounting component such as a wiring board in the mounting area with an adhesive, the degree of adhesive flow varies depending on the density of the electrodes in the mounting area, resulting in problems such as poor adhesion there's a possibility that. Alternatively, for example, when the liquid ejecting head is heated during the manufacturing process, the heat distribution in the mounting area is biased according to the density of the electrodes in the mounting area, and the characteristics of the elements formed thereafter are not uniform. It can also cause sex. In consideration of at least one of the circumstances exemplified above, an object of the present invention is to make the density of the electrodes in the mounting region uniform.

  In order to solve the above problems, a liquid jet head according to a preferred aspect of the present invention is a plurality of drive elements that apply pressure to a pressure chamber filled with liquid and jet the liquid from a nozzle, A plurality of first drive elements arranged along the first direction and a plurality of first drive elements arranged along the first direction on the opposite side of the plurality of first drive elements across the mounting region where the mounting component is placed A plurality of drive elements including two drive elements, and a plurality of electrodes formed in the mounting region so as to extend along a second direction intersecting the first direction. A plurality of first electrodes arranged in a first direction in the first region and electrically connected to the plurality of first drive elements, a first region of the mounting region, and a mounting region The second region of the first region located on one side in the first direction when viewed from the first region. A plurality of second electrodes arranged along the first direction across the region and electrically connected to the plurality of second drive elements, and the second electrodes adjacent to each other along the first direction in the second region And a third electrode that does not contribute to liquid ejection. In the above aspect, in the configuration in which the first electrode and the second electrode are formed in the first region of the mounting region and the second electrode is formed in the second region, the first region is along the first direction in the second region. A third electrode that does not contribute to liquid ejection is formed between the second electrodes adjacent to each other. Therefore, as compared with the configuration in which the third electrode is not formed in the second region, the difference in the electrode density between the first region and the second region is reduced. That is, it is possible to make the density of the electrodes in the mounting region uniform. According to the configuration in which the pitch in which the first electrode and the second electrode are arranged in the first region is equal to the pitch in which the second electrode and the third electrode are arranged in the second region, The effect that the density of the inner electrodes can be made uniform is particularly remarkable.

  The “third electrode that does not contribute to liquid ejection” includes, for example, an electrode that is not electrically connected to a drive element, an electrode that is electrically connected to an invalid drive element that does not contribute to liquid ejection, and the like. This means a so-called dummy electrode. As an invalid driving element, an element that lacks a part of an element that constitutes an effective driving element that contributes to liquid ejection (that is, an element that does not actually operate), or the driving element structure itself is an effective driving element. (Thus, it actually operates by supplying an electric signal), but is blocked at any point until it reaches the outside (for example, a channel where the most downstream nozzle is blocked or an intermediate channel) It includes a drive element arranged corresponding to a channel whose location is closed.

  By the way, under a configuration in which a flexible wiring board on which a plurality of connection terminals that are electrically connected to a plurality of first electrodes and a plurality of second electrodes is formed is fixed with an adhesive as a mounting component. If the density of the electrodes is different between the first region and the second region, the optimal application amount and flow amount of the adhesive may be different between the first region and the second region. Problems such as substrate position errors may become apparent. Therefore, the present invention capable of making the density of the electrodes in the mounting region uniform is particularly effective when a flexible wiring board is fixed as a mounting component with an adhesive. In particular, in a configuration including a structure including a first wall surface positioned between the mounting region and the plurality of first driving elements and a second wall surface positioned between the mounting region and the second driving element, the bonding is performed. As a result of the excess of the agent being blocked by the first wall surface and the second wall surface, an error may occur in the position of the wiring board due to the stress from the adhesive. The present invention that can make the density of the electrodes in the mounting region uniform is particularly suitable for a configuration in which a structure including a first wall surface and a second wall surface is installed.

  In a preferred aspect of the present invention, a plurality of third electrodes are arranged at a first pitch along the first direction on the opposite side of the second region from the first region. In the above aspect, the third electrode is formed in the region of the second region where the second region is formed, and a plurality of electrodes are arranged at the first pitch on the opposite side of the second region from the first region. Is done. Accordingly, there is an advantage that the density of the electrodes can be made uniform over a wide range including a region where the second electrode does not exist in the second region.

  Each of the plurality of drive elements includes a first drive electrode, a piezoelectric body formed on the surface of the first drive electrode in a process including heat treatment, and a second drive electrode formed on the surface of the piezoelectric body. In addition, in the configuration in which the first electrode is electrically connected to the first drive electrode of the first drive element and the second electrode is electrically connected to the first drive electrode of the second drive element, a piezoelectric body is formed. In the heat treatment process, a deviation in heat distribution occurs depending on the presence or absence of the first drive electrode, which may cause problems such as poor film formation of the piezoelectric body. In view of the above circumstances, the liquid ejecting head according to a preferred aspect of the present invention includes the first drive electrode on the opposite side of the other end with respect to one end in the arrangement of the plurality of first drive elements. And a fourth electrode formed in the same layer. In the above aspect, since the fourth electrode is formed in the same layer as the first drive electrode on the side opposite to the other end with respect to one end in the arrangement of the plurality of first drive elements, the first drive The bias of the heat distribution is reduced between the region where the elements are arranged and other regions. Therefore, it is possible to solve problems such as a film formation failure of the piezoelectric body of each drive element. The above effect is particularly remarkable in a configuration in which the distance between the first drive electrode of the first drive element and the first drive electrode of the second drive element is wider than the range in which the fourth electrode is distributed along the first direction. It is remarkable.

  In a preferred aspect of the present invention, the range in which the first electrode exists along the second direction and the range in which the second electrode exists along the second direction overlap with each other in the second direction. In the above aspect, since the range where the first electrode exists along the second direction overlaps with the range where the second electrode exists along the second direction, it is easy to install the mounting component within the overlap range. In a simple process, the first electrode and the second electrode can be connected to the mounting component.

  In a preferred aspect of the present invention, the nozzle corresponding to the first drive element located at one end in the first direction among the plurality of first drive elements, and the first direction among the plurality of second drive elements. An imaginary line connecting the nozzle corresponding to the second drive element located at the one end is within a range of 30 ° to 60 ° with respect to the first direction (more preferably, 30 ° to It is inclined by an angle of 40 ° or less, or 50 ° or more and 60 ° or less. In the above aspect, since the virtual line and the first direction are inclined with respect to each other, for example, the dot density (resolution) in the direction is increased as compared with a configuration in which a plurality of nozzles are arranged in a direction perpendicular to the first direction. It is possible.

  A liquid ejecting apparatus according to a preferred aspect of the invention includes the liquid ejecting head according to each of the above aspects. A good example of the liquid ejecting head is a printing apparatus that ejects ink, but the use of the liquid ejecting apparatus according to the present invention is not limited to printing.

1 is a configuration diagram of a printing apparatus according to a first embodiment of the present invention. It is a top view of a liquid ejection module. It is a disassembled perspective view of a liquid injection unit. It is explanatory drawing of the arrangement | sequence of a some nozzle. FIG. 3 is a cross-sectional view of a liquid ejecting head. FIG. 3 is a cross-sectional view of a liquid ejecting head in which the vicinity of a piezoelectric element is enlarged. FIG. 6 is an explanatory diagram of a liquid ejecting head focusing on a mounting area. FIG. 10 is an explanatory diagram of a liquid jet head according to a second embodiment. FIG. 10 is an explanatory diagram of a liquid jet head according to a third embodiment. FIG. 10 is an explanatory diagram of a liquid jet head according to a fourth embodiment. It is explanatory drawing of the arrangement | sequence of the some nozzle which concerns on a modification. It is explanatory drawing of the pitch in the arrangement | sequence of several electrodes.

<First Embodiment>
FIG. 1 is a partial configuration diagram of an ink jet printing apparatus 10 according to a first embodiment of the present invention. The printing apparatus 10 according to the first embodiment is a liquid ejecting apparatus that ejects ink, which is an example of liquid, onto a medium (ejecting target) 12 such as printing paper, and includes a control device 22, a transport mechanism 24, and a liquid ejecting module 26. It has. A liquid container (cartridge) 14 that stores a plurality of colors of ink is attached to the printing apparatus 10. In the first embodiment, a total of four ink colors, cyan (C), magenta (M), yellow (Y), and black (B), are stored in the liquid container 14.

  The control device 22 comprehensively controls each element of the printing apparatus 10. The transport mechanism 24 transports the medium 12 in the Y direction under the control of the control device 22. The liquid ejecting module 26 ejects ink supplied from the liquid container 14 onto the medium 12 under the control of the control device 22. The liquid ejecting module 26 of the first embodiment is a line head that is long in the X direction that intersects (typically orthogonal) in the Y direction. In parallel with the transport of the medium 12 by the transport mechanism 24, the liquid ejecting module 26 ejects ink onto the medium 12, thereby forming a desired image on the surface of the medium 12. Hereinafter, a direction perpendicular to the XY plane (a plane parallel to the surface of the medium 12) is referred to as a Z direction. The ink ejection direction by the liquid ejection module 26 corresponds to the Z direction.

  FIG. 2 is a plan view of a surface of the liquid ejecting module 26 facing the medium 12. As illustrated in FIG. 2, the liquid ejecting module 26 includes a plurality of liquid ejecting units U arranged along the X direction. FIG. 3 is an exploded perspective view of each liquid ejecting unit U. FIG. As illustrated in FIGS. 2 and 3, each of the plurality of liquid ejecting units U includes a plurality (six) of liquid ejecting heads 30 arranged along the X direction. A plurality of nozzles (ejection ports) N are formed in each liquid ejection head 30. As illustrated in FIG. 3, the six liquid ejecting heads 30 of the liquid ejecting module 26 are fixed to the surface of a flat fixed plate 32. The fixed plate 32 is formed with an opening 322 that exposes the nozzle N of each liquid jet head 30. The four color inks stored in the liquid container 14 are supplied in parallel to the plurality of liquid ejecting heads 30 of each liquid ejecting module 26 and ejected from the nozzles N of the respective liquid ejecting heads 30.

  FIG. 4 is a plan view focusing on the arrangement of the plurality of nozzles N of the liquid ejecting head 30. As illustrated in FIG. 4, the plurality of nozzles N of each liquid jet head 30 are divided into a first nozzle row N1 and a second nozzle row N2. Each of the first nozzle row N1 and the second nozzle row N2 is a set of a plurality of nozzles N arranged along the W1 direction (first direction) in the XY plane. The total number of nozzles N is the same in the first nozzle row N1 and the second nozzle row N2. The W1 direction is a direction that intersects the X direction and the Y direction at a non-right angle in the XY plane. Specifically, the W1 direction is inclined at an angle θ with respect to the Y direction. The angle θ is set to 30 ° to 60 ° (preferably 30 ° to 40 ° or 50 ° to 60 °). As described above, in the first embodiment, since the plurality of nozzles N are arranged in the W1 direction inclined with respect to the Y direction in which the medium 12 is conveyed, a configuration in which the plurality of nozzles N are arranged along the X direction In comparison, the substantial dot density (resolution) in the X direction of the medium 12 can be increased.

  The first nozzle row N1 and the second nozzle row N2 are provided with a space between each other along the W2 direction (second direction) intersecting (typically orthogonal) with the W1 direction in the XY plane. The As understood from FIG. 4, the first nozzle row N 1 and the second nozzle row N 2 of each liquid ejecting head 30 are arranged at equal intervals over the plurality of liquid ejecting heads 30. Paying attention to the first nozzle row N1 and the second nozzle row N2 that are adjacent to each other in the W2 direction, the range in the X direction in which the plurality of nozzles N of the first nozzle row N1 are distributed, and the plurality of second nozzle rows N2 The ranges in the X direction where the nozzles N are distributed overlap each other.

  Each nozzle N in the first nozzle row N1 and each nozzle N in the second nozzle row N2 have a common position in the X direction. That is, each nozzle N of the first nozzle row N1 and each nozzle N of the second nozzle row N2 are located on a straight line parallel to the Y direction. For example, one nozzle N located at the negative end of the first nozzle row N1 in the W1 direction and one nozzle N located at the negative end of the second nozzle row N2 in the W1 direction. The imaginary line L connecting the centers of the two lines extends in a direction parallel to the Y direction and is inclined with respect to the W1 direction by the aforementioned angle θ (30 ° ≦ θ ≦ 60 °). Therefore, it is possible to overlap the ink ejected from the nozzle N of the first nozzle row N1 and the ink ejected from the nozzle N of the second nozzle row N2 at the same position of the medium 12 conveyed in the Y direction. is there.

  The plurality of nozzles N in each of the first nozzle row N1 and the second nozzle row N2 has a pitch of each nozzle N in the X direction (a distance between the centers of the adjacent nozzles N) PX and each in the Y direction. The pitch N of the nozzles N is formed to have an integer ratio (for example, PX: PY = 1: 2). According to the above configuration, when an image in which a plurality of pixels are arranged in a matrix is printed on the medium 12, the correspondence relationship between each pixel of the image specified by the image data and each nozzle N of the liquid ejecting head 30. Has the advantage of being simplified.

  Each of the first nozzle row N1 and the second nozzle row N2 is used for ejecting ink of two different colors (a total of four colors in the first nozzle row N1 and the second nozzle row N2). Specifically, as illustrated in FIG. 4, yellow (Y) ink is ejected from a predetermined number of nozzles N located on the negative side in the W1 direction in the first nozzle row N1 of each liquid ejecting head 30. The cyan (C) ink is ejected from a predetermined number of nozzles N located on the positive side in the W1 direction in the first nozzle row N1. In addition, magenta (M) ink is ejected from a predetermined number of nozzles N located on the negative side in the W1 direction in the second nozzle row N2 of each liquid ejecting head 30, and in the W1 direction in the second nozzle row N2. Black (B) ink is ejected from a predetermined number of nozzles N located on the positive side. In the above configuration, the nozzles N corresponding to the four different colors are arranged along the Y direction. Therefore, it is possible to overlap four color inks at the same position of the medium 12 transported in the Y direction.

  FIG. 5 is a cross-sectional view of an arbitrary liquid jet head 30, and shows a cross section taken along the line VV of FIG. 4 (a cross section perpendicular to the W1 direction). As illustrated in FIG. 5, in the liquid jet head 30, the pressure chamber substrate 44, the vibration plate 46, the sealing body 52, and the support body 54 are installed on the negative side surface in the Z direction of the flow path substrate 42. In addition, this is a structure (head chip) in which the nozzle plate 62 and the compliance portion 64 are installed on the positive side surface in the Z direction of the flow path substrate 42. Each element of the liquid ejecting head 30 is generally a substantially flat member that is long in the W1 direction, and is fixed to each other by using, for example, an adhesive.

  The plurality of nozzles N described above with reference to FIG. As understood from FIG. 5, each liquid ejecting head 30 has a structure corresponding to each nozzle N of the first nozzle row N1 and a structure corresponding to each nozzle N of the second nozzle row N2 formed in substantially line symmetry. Therefore, hereinafter, the structure of the liquid ejecting head 30 will be described focusing attention on the first nozzle row N1 for the sake of convenience.

  The flow path substrate 42 is a flat plate material that forms a flow path, and an opening 422, a supply flow path 424, and a communication flow path 426 are formed. The supply channel 424 and the communication channel 426 are formed for each nozzle N, and the opening 422 is continuous over a plurality of nozzles N that eject ink of one color. The pressure chamber substrate 44 is a flat plate in which a plurality of openings 422 corresponding to different nozzles N are formed. The flow path substrate 42 and the pressure chamber substrate 44 are formed of, for example, a silicon single crystal substrate.

  The compliance unit 64 in FIG. 5 is an element that suppresses (absorbs) pressure fluctuation in the flow path inside the liquid jet head 30 and includes, for example, a flexible member formed in a sheet shape. Specifically, the compliance section 64 is fixed to the surface of the flow path substrate 42 so that the opening 422 of the flow path substrate 42 and each supply flow path 424 are closed.

  As illustrated in FIG. 5, the support body 54 is fixed to the negative surface of the flow path substrate 42 in the Z direction. An accommodating portion 542 and an introduction channel 544 are formed in the support 54. The accommodating portion 542 is a concave portion (dent) having an outer shape corresponding to the opening 422 of the flow path substrate 42 in a plan view (that is, viewed from the Z direction), and the introduction flow path 544 is a flow path communicating with the accommodating portion 542. It is. As understood from FIG. 5, a space in which the opening 422 of the flow path substrate 42 and the accommodating portion 542 of the support 54 communicate with each other functions as a liquid storage chamber (reservoir) SR. The liquid storage chamber SR is formed independently for each color of ink supplied from the liquid container 14 and stores the ink that has passed through the introduction flow path 544. That is, in one arbitrary liquid ejecting head 30, four liquid storage chambers SR corresponding to different inks are formed. The compliance unit 64 in FIG. 5 constitutes the bottom surface of the liquid storage chamber SR and absorbs pressure fluctuations of the ink in the liquid storage chamber SR.

  The pressure chamber substrate 44 is a flat plate in which a plurality of openings 442 corresponding to different nozzles N are formed. A diaphragm 46 is installed on the surface of the pressure chamber substrate 44 opposite to the flow path substrate 42. The diaphragm 46 is a flat plate-like member that can vibrate elastically. For example, the diaphragm 46 is constituted by a laminate of an elastic film formed of an elastic material such as silicon oxide and an insulating film formed of an insulating material such as zirconium oxide. As understood from FIG. 5, the diaphragm 46 and the flow path substrate 42 oppose each other with an interval inside each opening 442 of the pressure chamber substrate 44. A space sandwiched between the flow path substrate 42 and the diaphragm 46 inside each opening 442 functions as a pressure chamber (cavity) SC that applies pressure to the ink. Each pressure chamber SC communicates with the nozzle N via each communication channel 426 of the channel substrate 42.

  A plurality of drive elements F corresponding to different nozzles N (pressure chambers SC) are formed on the surface of the diaphragm 46 opposite to the pressure chamber substrate 44. FIG. 6 is an enlarged cross-sectional view (cross section perpendicular to the W1 direction) of the vicinity of any one drive element F. FIG. As illustrated in FIG. 6, each of the plurality of drive elements F includes a first drive electrode 72 formed on the surface of the diaphragm 46, and a piezoelectric body 74 formed on the surface of the first drive electrode 72. The piezoelectric element includes a second drive electrode 76 formed on the surface of the piezoelectric body 74. A region where the first drive electrode 72 and the second drive electrode 76 face each other with the piezoelectric body 74 interposed therebetween functions as the drive element F.

  The piezoelectric body 74 is formed by a process including heat treatment (firing), for example. Specifically, the piezoelectric material applied to the surface of the diaphragm 46 on which the plurality of first drive electrodes 72 are formed is fired by heat treatment in a firing furnace and then shaped for each drive element F (for example, plasma The piezoelectric body 74 is formed by milling using the above. Each first drive electrode 72 is individually formed for each drive element F and is electrically insulated from each other, and each second drive electrode 76 is formed individually for each drive element F and has a constant potential (for example, ground potential). Common reference potential). A configuration in which the second drive electrode 76 is continuous over a plurality of drive elements F can also be employed.

  FIG. 7 is a schematic diagram of each element when the liquid ejecting head 30 is viewed from the negative side in the Z direction (the side opposite to the medium 12). As illustrated in FIG. 7, the plurality of driving elements F of the liquid jet head 30 are divided into a first element group G1 and a second element group G2. The first element group G1 is a set of a plurality of driving elements F (first driving elements) corresponding to the respective nozzles N of the first nozzle array N1, and the second element group G2 includes the nozzles of the second nozzle array N2. A set of a plurality of drive elements F (second drive elements) corresponding to N. The plurality of drive elements F of the first element group G1 are arranged along the W1 direction, and the plurality of drive elements F of the second element group G2 are arranged along the W1 direction in the same manner. A predetermined number of drive elements F located on the negative side in the W1 direction in the first element group G1 correspond to yellow (that is, by applying pressure to the pressure chamber SC filled with yellow ink, Ink is ejected), and a predetermined number of driving elements F located on the positive side in the W1 direction in the first element group G1 correspond to cyan. On the other hand, a predetermined number of driving elements F located on the negative side in the W1 direction in the second element group G2 correspond to magenta, and a predetermined number of driving elements F located on the positive side in the W1 direction in the second element group G2. Corresponds to black.

  The first element group G1 and the second element group G2 are provided side by side with an interval in the W2 direction. As illustrated in FIG. 7, an area (hereinafter referred to as “mounting area”) Q in which mounting components are installed is secured between the first element group G1 and the second element group G2 on the surface of the diaphragm 46. Is done. That is, the plurality of driving elements F of the first element group G1 and the plurality of driving elements F of the second element group G2 are located on opposite sides of the mounting region Q that is long in the W1 direction. In the first embodiment, as illustrated in FIGS. 5 and 6, a flexible wiring substrate 34 (COF: for electrically connecting the liquid ejecting head 30 to an external device (the control device 22 or a power supply circuit). Chip On Film) is mounted on the mounting region Q as a mounting component.

  5 is a structure that protects each driving element F (for example, prevents adhesion of moisture and the like to the driving element F) and reinforces the mechanical strength of the pressure chamber substrate 44 and the diaphragm 46. Yes, and fixed to the surface of the diaphragm 46 with an adhesive, for example. Each drive element F is accommodated in a recess formed on the surface of the sealing body 52 on the diaphragm 46 side. As illustrated in FIG. 5, the sealing body 52 of the first embodiment includes a first wall surface 521 positioned between the mounting region Q and the first element group G1 in a plan view, and a mounting region Q in a plan view. And a second wall surface 522 positioned between the second element group G2. That is, the mounting area Q can also be referred to as an area sandwiched between the first wall surface 521 and the second wall surface 522 in plan view.

  As illustrated in FIG. 7, a plurality of electrodes E are formed in the mounting region Q in the surface of the diaphragm 46. Each electrode E is a conductor formed (patterned) in a shape extending in the W2 direction in plan view, and is electrically connected to each wiring of the wiring board 34 and each driving element F on the surface of the diaphragm 46. Used for The plurality of electrodes E in the mounting region Q include a plurality of first electrodes E1, a plurality of second electrodes E2, and a plurality of third electrodes E3. In the configuration in which the diaphragm 46 is removed in the mounting region Q, a plurality of electrodes E can be formed on the surface of the pressure chamber substrate 44.

  As illustrated in FIG. 7, the mounting area Q is divided into a first area A1, a second area A2, and a third area A3. The second area A2 is located on the negative side in the W1 direction as viewed from the first area A1, and the third area A3 is located on the positive side in the W1 direction as viewed from the first area A1. That is, the first area A1 is located between the second area A2 and the third area A3. As understood from FIG. 7, the first area A1 is an area where the first element group G1 and the second element group G2 (first nozzle array N1 and second nozzle array N2) overlap each other along the W1 direction. It corresponds to. On the other hand, the second region A2 corresponds to a region that does not overlap the first element group G1 in the W1 direction range where the second element group G2 exists, and the third region A3 includes the first element group G1. It corresponds to a region that does not overlap with the second element group G2 in the range in the W1 direction.

  The plurality of first electrodes E1 are arranged at a predetermined pitch PW along the W1 direction across the first region A1 and the third region A3 in the mounting region Q. On the other hand, the plurality of second electrodes E2 are arranged along the W1 direction at the same pitch PW as each first electrode E1 over the first region A1 and the second region A2 in the mounting region Q. Each of the plurality of first electrodes E1 extends to the positive side in the W2 direction within the mounting region Q and is electrically connected to each driving element F (first driving element) of the first element group G1. Each of the second electrodes E2 extends to the negative side in the W2 direction within the mounting region Q and is electrically connected to each driving element F (second driving element) of the second element group G2. Specifically, as illustrated in FIG. 6, each first electrode E <b> 1 and each second electrode E <b> 2 is configured by stacking connection wirings 82 and connection terminals 84. The connection wiring 82 is a conductor (wiring) connected to the first driving electrode 72 of each driving element F. In the first embodiment, a configuration in which the connection wiring 82 is continuous in the same layer as the first drive electrode 72 is illustrated, but the connection wiring 82 formed in a layer different from the first drive electrode 72 is used as the first electrode E1. It is also possible to connect. On the other hand, the connection terminal 84 is a conductor (crimp terminal) formed on the surface of the end of the connection wiring 82 opposite to the drive element F.

  As illustrated in FIG. 7, in the first region A1 of the mounting region Q, the plurality of first electrodes E1 and the plurality of second electrodes E2 are W1 at a pitch P0 (P0 = PW / 2) which is half the pitch PW. Alternatingly arranged along the direction. That is, the second electrode E2 is located between the two first electrodes E1 adjacent to each other in the W1 direction. The range in which the first electrode E1 exists along the W2 direction and the range in which the second electrode E2 exists along the W2 direction overlap with each other in the W2 direction. That is, both the first electrode E1 and the second electrode E2 exist within a predetermined range α in the W2 direction in the mounting region Q.

  As illustrated in FIG. 7, the plurality of third electrodes E3 are formed in each of the second region A2 and the third region A3. On the other hand, the third electrode E3 is not formed in the first region A1. The first electrode E1 and the second electrode E2 are electrically connected to each drive element F as described above, whereas the third electrode E3 of the first embodiment is electrically connected to any drive element F. Not connected. That is, the third electrode E3 is a dummy wiring (invalid wiring) that does not actually contribute to the operation (ink ejection) of the driving element F.

  Each of the plurality of third electrodes E3 is formed in the same layer as the first electrode E1 and the second electrode E2 (lamination of the connection wiring 82 and the connection terminal 84). Each third electrode E3 formed in the second region A2 of the mounting region Q is located between the two second electrodes E2 adjacent to each other at a pitch PW along the W1 direction in the second region A2. . Specifically, as illustrated in FIG. 7, in the first region A1 of the mounting region Q, the pitch P0 is equal to the pitch P0 in which the first electrode E1 and the second electrode E2 are arranged. Then, the second electrode E2 and the third electrode E3 are alternately arranged along the W1 direction. On the other hand, each third electrode E3 formed in the third region A3 of the mounting region Q is between the two first electrodes E1 adjacent to each other at a pitch PW along the W1 direction in the third region A3. To position. Specifically, as illustrated in FIG. 7, the pitch P0 is equal to the arrangement of the first electrode E1 and the second electrode E2 in the first region A1, and the first electrode E1 and the third electrode in the third region A3. Electrodes E3 are alternately arranged along the W1 direction. As understood from the above description, in the first embodiment, the plurality of electrodes E extend along the W1 direction over the entire mounting region Q including the second region A2 and the third region A3 in addition to the first region A1. They are arranged at the same pitch P0.

  The range in which the third electrode E3 exists along the W2 direction in the mounting region Q overlaps the range of the first electrode E1 and the second electrode E2 in the W2 direction. That is, the third electrodes E3 in the second region A2 and the third region A3 exist within a range α in the mounting region Q where the first electrode E1 and the second electrode E2 overlap.

  As described above, the flexible wiring board 34 is mounted in the mounting region Q. As illustrated in FIG. 6, in the state where the connection terminals 342 (wiring) formed on the surface of the wiring board 34 are in contact with the electrodes E (connection terminals 84) on the surface of the diaphragm 46, the wiring board 34 is adhesive. It is fixed to the surface of the diaphragm 46 by 36. Specifically, the fluid adhesive 36 is applied in the mounting region Q (range α), and the adhesive 36 is cured in a state where the end of the wiring board 34 is pressed against the surface of the diaphragm 46. The wiring board 34 is mounted on the liquid jet head 30. A drive signal for controlling each drive element F is supplied from each connection terminal 342 of the wiring board 34 to each drive element F of the first element group G1 through the first electrode E1, and at the same time the second electrode E2. Is supplied to each driving element F of the second element group G2.

  A configuration in which the third electrode E3 is not formed in the second region A2 and the third region A3 is assumed as being proportional to the first embodiment. In contrast, in the first region A1, the first electrode E1 and the second electrode E2 are alternately arranged at a pitch P0 along the W1 direction. However, only the second electrode E2 has a pitch PW in the second region A2. In the third region A3, only the first electrodes E1 are arranged with a pitch PW. That is, in the second region A2 and the third region A3, the density of the electrodes E is different from that of the first region A1. Specifically, the density of each electrode E in the second electrode E2 and the third electrode E3 is lower than the density in the first region A1. In the above comparison, the adhesive 36 applied to the surface of the diaphragm 46 for mounting the wiring board 34 is the first electrode E1 and the second electrode E2 that are adjacent to each other at the pitch P0 in the first region A1. In the second region A2, it can be distributed in a wide space between the second electrodes E2 adjacent to each other at a pitch PW (PW = P0 × 2). Therefore, when the application amount of the adhesive 36 is selected so that the adhesive 36 is optimally distributed in the first area A1, the adhesive 36 is insufficient in the second area A2, and as a result, the wiring board 34 is obtained. It is difficult to ensure sufficient adhesive strength. On the other hand, when the application amount of the adhesive 36 is selected so that the adhesive 36 is optimally distributed in the second region A2, the excess of the adhesive 36 becomes a problem in the first region A1. For example, when the adhesive 36 is excessive in the first region A1, the adhesive 36 in the first region A1 flows over a wide range to the sealing body 52 in the process of pressing the wiring board 34 against the diaphragm 46. There is a problem that the position of the wiring board 34 is shifted due to the stress from the adhesive 36 that reaches and is blocked by the first wall surface 521 and the second wall surface 522. In the above description, the first area A1 and the second area A2 are noted for convenience, but the same problem may occur in the third area A3.

  In contrast to the above-described comparative example, in the first embodiment, the first electrode E1 and the second electrode E2 are alternately arranged at the pitch P0 in the first region A1, while the second region A2 A third electrode E3 is formed between the two second electrodes E2 adjacent to each other, and a third electrode E3 is formed between the two first electrodes E1 adjacent to each other in the third region A3. . That is, in the first embodiment, the difference in density of the electrodes E in the mounting region Q (difference between the first region A1 and the second region A2 or the third region A3) is suppressed as compared with the comparative example. . Therefore, according to the first embodiment, there is an advantage that the above-described problems (insufficient adhesion strength and position error of the wiring board 34) due to the difference in density of the electrodes E in the mounting region Q can be solved. . Particularly in the first embodiment, the second electrode E2 and the third electrode E3 are arranged in the second region A2 at the same pitch P0 as the arrangement of the first electrode E1 and the second electrode E2 in the first region A1. The above-described effect that the difference in density of the electrode E between the first region A1 and the second region A2 is suppressed is particularly remarkable. Note that the above-described problem that excessive adhesive 36 presses the wiring board 34 to generate a position error is caused by the surplus of the adhesive 36 reaching the sealing body 52 and the first wall surface 521 and the second wall surface. Occurs as a result of damming at 522. Considering the above circumstances, in the first embodiment, the first wall surface 521 is positioned between the mounting region Q and the first element group G1, and the second wall surface is interposed between the mounting region Q and the second element group G2. It is particularly suitable for a configuration in which a sealing body 52 having a shape where 522 is located is installed.

  In the above description, the problem related to the adhesion of the wiring board 34 is exemplified, but the problem caused by the density of the electrodes E in the mounting region Q is not limited to the above example. For example, in the comparison in which the third electrode E3 is not formed, between the first region A1 where the density (pitch P0) of the plurality of electrodes E is high and the second region A2 where the density (pitch PW) of the plurality of electrodes E is low. Since the degree of heat conduction is different, for example, in the step of firing the piezoelectric body 74 by heat treatment, there is a difference in temperature (bias of heat distribution) between the first region A1 and the second region A2 or the third region A3. Can occur. In the state where the heat distribution is biased as described above, there is a possibility that a problem such as film formation failure may occur in an element formed in each subsequent process. On the other hand, in the first embodiment in which the third electrode E3 is formed in the second region A2 and the third region A3, since the density of the electrodes E in the mounting region Q is suppressed, the heat distribution is made uniform in the mounting region Q. Is done. Therefore, there is an advantage that problems such as film formation defects caused by uneven heat distribution can be prevented. As understood from the above description, the above-described effect of the first embodiment in which the density of the plurality of electrodes E in the mounting region Q is made uniform by forming the third electrode E3 is the adhesion of the wiring board 34. Even a configuration not premised on can be fully exhibited. That is, the configuration in which the wiring board 34 is bonded using the adhesive 36 is not essential in the present invention.

Second Embodiment
A second embodiment of the present invention will be described. In addition, about the element which an effect | action and function are the same as that of 1st Embodiment in each form illustrated below, the code | symbol used by description of 1st Embodiment is diverted, and each detailed description is abbreviate | omitted suitably.

  FIG. 8 is a schematic diagram of each element when the liquid jet head 30 of the second embodiment is viewed from the negative side in the Z direction. As illustrated in FIG. 8, the liquid ejecting head 30 of the second embodiment includes a plurality of dummy elements FD that are not actually used for ejecting ink. Specifically, as illustrated in FIG. 8, between the plurality of drive elements F corresponding to yellow and the plurality of drive elements F corresponding to cyan in the first element group G1 (that is, in the first nozzle row N1). A plurality of dummy elements FD are formed between the colors), and a plurality of dummy elements FD are formed between the plurality of driving elements F corresponding to magenta and the plurality of driving elements F corresponding to black in the second element group G2. Is done. Each dummy element FD is formed by stacking a first drive electrode 72, a piezoelectric body 74, and a second drive electrode 76, like the drive element F actually used for ink ejection.

  A pressure chamber SD corresponding to each dummy element FD is formed on the pressure chamber substrate 44 of the second embodiment. The pressure chamber SD is a pseudo space that is formed in the same structure (common or similar) as the pressure chamber SC corresponding to the drive element F, but is not actually used for ink ejection. Specifically, ink is supplied from the liquid storage chamber SR to each pressure chamber SD, but the communication channel 426 and the nozzle N are not formed on the downstream side of the pressure chamber SD. Therefore, ink is not ejected even if the pressure in the pressure chamber SD fluctuates. As understood from the above description, each dummy element FD is formed in the same structure (common or similar) as the drive element F actually used for ink ejection, but does not actually contribute to ink ejection. It is a pseudo element.

  In the second embodiment, the first area A1 of the mounting area Q is divided into an area RA and an area RB. The region RA is located on the positive side in the W1 direction when viewed from the region RB. The region RA includes a region RA1 on the third region A3 side and a region RA2 located on the negative side in the W1 direction as viewed from the region RA1, and the region RB includes the region RB1 on the second region A2 side and the region RB1. And a region RB2 located on the positive side in the W1 direction. The region RA2 is located between the plurality of dummy elements FD of the first element group G1 and the black driving element F of the second element group G2, and the region RB2 is composed of the plurality of dummy elements FD of the second element group G2. It is located between the yellow drive element F of the first element group G1.

  In the region RA1 of the mounting region Q, a plurality of first electrodes E1 connected to each driving element F of the first element group G1 are arranged at a pitch PW along the W1 direction. A plurality of second electrodes E2 connected to each driving element F of the second element group G2 are arranged at a pitch PW along the W1 direction across the regions RA1 and RA2. Accordingly, in the region RA1, as in the first region A1 of the first embodiment, a plurality of first electrodes E1 and a plurality of second electrodes E2 are alternately arranged at a pitch P0 along the W1 direction. On the other hand, since each dummy element FD is not actually used for ejecting ink, the electrode E corresponding to each dummy element FD is essentially unnecessary. However, in the second embodiment, as illustrated in FIG. 8, a plurality of third electrodes E3 electrically connected to the respective dummy elements FD are formed in the region RA2. In the region RA2, as in the second region A2, a plurality of second electrodes E2 and a plurality of third electrodes E3 are arranged so that the third electrode E3 is located between the second electrodes E2 adjacent to each other. They are alternately arranged at a pitch P0 along the W1 direction.

  A plurality of electrodes E are similarly arranged in the region RB. That is, the first electrode E1 and the second electrode E2 are alternately arranged at a pitch P0 along the W1 direction in the region RB1, and the region RB2 is connected to each driving element F of the first element group G1. The first electrodes E1 and the third electrodes E3 connected to the respective dummy elements FD are alternately arranged at a pitch P0 along the W1 direction.

  The arrangement of the electrodes E in the second region A2 and the third region A3 is the same as in the first embodiment. Therefore, the same effects as those of the first embodiment are realized in the second embodiment. In the second embodiment, the third electrode E3 is formed in the region RA2 and the region RB2 similarly to the second region A2 and the third region A3. Therefore, for example, the third electrode E3 is not formed in the region RA2 and the region RB2. Compared with the configuration, the difference in density of the electrode E between the region RA1 and the region RA2 and between the region RB1 and the region RB2 is reduced. Therefore, similarly to the first embodiment, there is an advantage that the above-described problems (insufficient adhesion strength and positional error of the wiring board 34) due to the difference in density of the electrodes E in the mounting region Q can be solved. As understood from the above description, the “third electrode” in the present invention corresponds to the region RA2 and the region corresponding to the dummy element FD, in addition to the third electrode E3 formed in the second region A2 and the third region A3. A third electrode E3 formed on RB2 is also included.

  In the second embodiment, the configuration in which the third electrode E3 formed in the region RA2 or the region RB2 is connected to the dummy element FD is exemplified. That is, the electrical configuration up to the wiring board 34 is common between the drive element F and the dummy element FD. FIG. 8 illustrates the configuration in which the ink flow paths corresponding to the respective dummy elements FD are closed (hereinafter referred to as “configuration 1”), but the ink flow paths corresponding to the respective dummy elements FD are arranged from the liquid storage chamber SR to the nozzles. If communication is performed up to N, a configuration (hereinafter referred to as “configuration 2”) in which ink is ejected using each dummy element FD as a normal drive element F is realized. The configuration 1 is suitable when a plurality of colors of ink are ejected from each of the first element group G1 and the second element group G2, but the configuration 2 is an ink of one color (for example, black) from all the nozzles N, for example. It is suitable when jetting. As understood from the above description, the second embodiment has an advantage that the electrical structure from each drive element F to the wiring board 34 can be shared by the configuration 1 and the configuration 2 (and thus the manufacturing cost can be reduced). is there. However, a configuration in which the third electrode E3 in the region RA2 and the region RB2 is not electrically connected to each dummy element FD (for example, a configuration in which the third electrode E3 is formed so as to be included in the range α in the region RA2 and the region RB2). ) May also be employed.

<Third Embodiment>
FIG. 9 is a schematic diagram of each element when the liquid jet head 30 of the third embodiment is viewed from the negative side in the Z direction. As illustrated in FIG. 9, in the third embodiment, a plurality of pressure chambers SD are formed on the positive side and the negative side in the W1 direction when viewed from the pressure chambers SC corresponding to the drive elements F of the first element group G1. . Similarly, a plurality of pressure chambers SD are formed on the positive side and the negative side in the W1 direction when viewed from the pressure chambers SC corresponding to the drive elements F of the second element group G2. Each pressure chamber SD is a pseudo space that is formed in the same structure as the pressure chamber SC as in the second embodiment, but is not actually used for ink ejection.

  In the configuration in which the pressure chambers SD are not formed on both sides of the arrangement of the plurality of pressure chambers SC (for example, the first embodiment), the pressure chambers SC located at both ends of the arrangement among the plurality of pressure chambers SC are positioned at the center of the arrangement. The pressure variation conditions (whether there are other pressure chambers SC only on one side in the W1 direction or other pressure chambers SC on both sides in the W1 direction) can be different from the pressure chambers SC. Accordingly, in each of the first nozzle array N1 and the second nozzle array N2, the ejection characteristics (ejection amount and ejection speed) of the ink from each nozzle N may differ depending on the position of the nozzle N. In the third embodiment, dummy pressure chambers SD having the same configuration as the pressure chambers SC are formed on both sides of the arrangement of the plurality of pressure chambers SC, so that they are located at both ends of the arrangement of the plurality of pressure chambers SC. It is possible to bring the pressure fluctuation condition closer between the pressure chamber SC and the pressure chamber SC located near the center of the array. Therefore, there is an advantage that the ejection characteristics of the ink from each nozzle N are made uniform at both ends and the center of each of the first nozzle row N1 and the second nozzle row N2.

  The second area A2 of the mounting area Q in the third embodiment is divided into an area A21 and an area A22. The region A21 is a region on the first region A1 side in the second region A2, and the region A22 is a region on the opposite side to the first region A1 in the second region A2. Each driving element F of the second element group G2 exists on the negative side in the W2 direction when viewed from the region A21. Similar to the second region A2 of the first embodiment, a second electrode E2 connected to the drive element F is formed in the region A21, and a third electrode E3 is provided between the second electrodes E2 adjacent to each other. The second electrode E2 and the third electrode E3 are arranged in the W1 direction at a pitch P0 so as to be positioned. Therefore, the third embodiment can achieve the same effect as the first embodiment.

  On the other hand, in the region A22 of the second region A2, since there is no drive element F on either the positive side or the negative side in the W2 direction, neither the first electrode E1 nor the second electrode E2 is formed in the region A22. . As illustrated in FIG. 9, in the third embodiment, a plurality of third electrodes E3 are formed in the region A22. In the area A22, a plurality of third electrodes are arranged at a pitch P0 equivalent to the arrangement of the first electrode E1 and the second electrode E2 in the first area A1 and the arrangement of the second electrode E2 and the third electrode E3 in the area A21 of the second area A2. The electrode E3 is arranged along the W1 direction.

  In the above description, the second area A2 is focused on, but the same configuration is also adopted for the third area A3. That is, in the region A31 on the first region A1 side in the third region A3, the plurality of first electrodes E1 and the plurality of third electrodes E3 are arranged at the pitch P0 along the W1 direction, and the third region A3 includes the first region A3. In the area A32 opposite to the one area A1, a plurality of third electrodes E3 are arranged at a pitch P0 along the W1 direction.

  As described above, in the third embodiment, the plurality of third electrodes E3 are arranged at the pitch P0 along the W1 direction in the region A22 of the second region A2 opposite to the first region A1. Therefore, there is an advantage that the density of the electrodes E is uniform over a wide range including the region A21 where the second electrode E2 is not present in addition to the region A21 where the second electrode E2 is present in the second region A2. Similarly, in the third region A3, it is possible to make the density of the electrode E uniform over a wide range including the region A32 where the first electrode E1 does not exist in addition to the region A31 where the first electrode E1 exists. Note that the configuration of the second embodiment can also be applied to the third embodiment.

<Fourth embodiment>
FIG. 10 is a schematic diagram of each element when the liquid jet head 30 of the fourth embodiment is viewed from the negative side in the Z direction. In the third embodiment, dummy pressure chambers SD are formed on both sides of the arrangement of the plurality of pressure chambers SC. In the fourth embodiment, in addition to the configuration of the third embodiment, dummy elements FD corresponding to the respective pressure chambers SD are formed. Each dummy element FD is a pseudo element that is formed in the same structure as the drive element F but is not actually used for ink ejection. As described above in the second embodiment, each dummy element FD is the same as each drive element F. The first drive electrode 72, the piezoelectric body 74, and the second drive electrode 76 are stacked. As understood from the above description, in the fourth embodiment, both sides in the W1 direction in each of the first element group G1 and the second element group G2 (the other side across one end in the array of the plurality of drive elements F). A dummy element FD including a first drive electrode 72 (fourth electrode), a piezoelectric body 74, and a second drive electrode 76 is formed on the side opposite to the end of the first drive electrode 72 (fourth electrode).

  As understood from FIG. 10, the distance d1 between the first drive electrode 72 of each drive element F of the first element group G1 and the first drive electrode 72 of each drive element F of the second element group G2 is the first element. It is wider than the range d2 in which the first drive electrodes 72 of the plurality of dummy elements FD are distributed on the positive side in the W1 direction in the group G1 and on the negative side in the W1 direction in the second element group G2 (d1> d2).

  In the fourth embodiment, the same effect as in the third embodiment is realized. By the way, as described above, the piezoelectric body 74 of each driving element F is formed by firing the piezoelectric material applied to the surface of the diaphragm 46 by heat treatment in a firing furnace and then separating the piezoelectric material for each driving element F. Is done. Since the degree of thermal conduction is different between the region where the first drive electrode 72 is formed and the region where the first drive electrode 72 is not formed on the surface of the diaphragm 46, the heat treatment is performed in the step of forming the piezoelectric body 74. In the stage, a temperature difference (bias of heat distribution in the XY plane) according to the presence or absence of the first drive electrode 72 may occur. In the third embodiment, the first drive electrode 72 of the drive element F is formed in the region corresponding to each pressure chamber SC, and the first drive electrode 72 of the dummy element FD is formed in the region corresponding to each pressure chamber SD. Therefore, the heat distribution is made uniform between the area of each pressure chamber SC and the area of each pressure chamber SD. Therefore, there is an advantage that problems such as poor film formation of the piezoelectric material due to uneven heat distribution can be prevented. Note that the configuration of the second embodiment can also be applied to the fourth embodiment.

<Modification>
The form illustrated above can be variously modified. Specific modifications are exemplified below. Two or more aspects arbitrarily selected from the following examples can be appropriately combined as long as they do not contradict each other.

(1) In each of the embodiments described above, a drive signal is supplied to the first drive electrode 72 located on the diaphragm 46 side of the drive element F (dummy element FD) and the second drive electrode on the opposite side of the diaphragm 46 is provided. Although the configuration in which 76 is set to a common constant potential is illustrated, a configuration in which each first drive electrode 72 is set to a common constant potential and a drive signal for each drive element F is supplied to each second drive electrode 76 is also employed. Can be done. Further, in each of the above-described embodiments, the dummy element FD having the same structure as that of the driving element F is illustrated, but the structure of the dummy element FD is not limited to the above examples. For example, it is also possible to form a dummy element FD having a structure in which some of the first drive electrode 72, the piezoelectric body 74, and the second drive electrode 76 are omitted.

(2) In each of the above-described embodiments, the configuration in which the first nozzle row N1 and the second nozzle row N2 are formed in one liquid ejecting head 30 is exemplified. However, the nozzles formed in one liquid ejecting head 30 The number of columns is appropriately changed. For example, a configuration in which a plurality of nozzles N of one liquid ejecting head 30 are arranged in three or more rows may be employed.

(3) In each of the above-described embodiments, the configuration in which the positions in the X direction are common to the nozzles N of the first nozzle array N1 and the nozzles N of the second nozzle array N2 is illustrated. However, the arrangement of the nozzles N is as described above. It is not limited to the illustration. For example, as illustrated in FIG. 11, the positions in the X direction may be different between the nozzles N of the first nozzle array N1 and the nozzles N of the second nozzle array N2. In FIG. 11, the positions in the X direction of the nozzles N of the first nozzle row N1 and the nozzles N of the second nozzle row N2 are indicated by the nozzles in the X direction of the first nozzle row N1 (or the second nozzle row N2). A configuration in which the pitch is different by half (PX / 2) of the pitch PX of N is illustrated. According to the configuration in FIG. 11, it is possible to increase (double) the substantial dot density in the X direction of the medium 12 as compared to the configuration in which a plurality of nozzles N are arranged as illustrated in FIG. 4. .

(4) The pitch P of the arrangement of the plurality of electrodes E is defined as the distance between the centers of the electrodes E adjacent to each other. For example, as illustrated in FIG. 12, when focusing on the electrodes EA and EB adjacent to each other, the distance between the center (center of gravity) eA of the electrode EA and the center eB of the electrode EB corresponds to the pitch P. The center e (eA, eB) of each electrode E is defined as, for example, the intersection of the center line along the direction (longitudinal direction) in which the electrode E extends and the center line in the width direction of the electrode E. The shape and direction are not questioned.

(5) The element (driving element F) that changes the pressure in the pressure chamber SC is not limited to the piezoelectric element exemplified in the above-described embodiments. For example, a vibrating body such as an electrostatic actuator can be used as the drive element F. Further, the drive element F is not limited to an element that imparts mechanical vibration to the pressure chamber SC. For example, a heating element (heater) that changes the pressure by generating bubbles in the pressure chamber SC by heating can be used as the driving element F. As understood from the above examples, the drive element F is included as an element (pressure generating element) for applying pressure to the inside of the pressure chamber SC, and a method for applying pressure (piezo method / thermal method) or a specific method. The configuration is not questioned.

(6) The printing apparatus 10 exemplified in each of the above embodiments can be employed in various apparatuses such as a facsimile apparatus and a copying machine in addition to apparatuses dedicated to printing. However, the use of the liquid ejecting apparatus of the present invention is not limited to printing. For example, a liquid ejecting apparatus that ejects a solution of a coloring material is used as a manufacturing apparatus that forms a color filter of a liquid crystal display device. Further, a liquid ejecting apparatus that ejects a solution of a conductive material is used as a manufacturing apparatus that forms wiring and electrodes of a wiring board.

DESCRIPTION OF SYMBOLS 10 ... Printing apparatus (liquid ejecting apparatus), 12 ... Medium, 14 ... Liquid container, 22 ... Control apparatus, 24 ... Conveyance mechanism, 26 ... Liquid ejecting module, U ... Liquid ejecting unit, 30 ... ... Liquid jet head, 32 ... Fixed plate, 34 ... Wiring board, 42 ... Flow path board, 44 ... Pressure chamber board, 46 ... Vibrating plate, 52 ... Sealing body, 54 ... Supporting body, 62 ... Nozzle plate, 64 ... Compliance section, 72 ... First drive electrode, 74 ... Piezoelectric body, 76 ... Second drive electrode.

Claims (10)

A plurality of driving elements for applying pressure to a pressure chamber filled with liquid and ejecting the liquid from a nozzle, the plurality of first driving elements arranged along a first direction, and a mounting component are installed A plurality of drive elements including a plurality of second drive elements arranged along the first direction on the opposite side of the plurality of first drive elements across the mounting region;
A plurality of electrodes formed in the mounting region so as to extend along a second direction intersecting the first direction;
The plurality of electrodes are:
A plurality of first electrodes arranged along the first direction in the first region of the mounting region and electrically connected to the plurality of first drive elements;
The first direction across the first region of the mounting region and the second region of the mounting region that is located on one side of the first direction as viewed from the first region. A plurality of second electrodes arranged along and electrically connected to the plurality of second drive elements;
A liquid ejecting head including: a third electrode which is formed between the second electrodes adjacent to each other along the first direction in the second region and does not contribute to the ejection of the liquid. The mounting component is a flexible wiring board on which a plurality of connection terminals that are electrically connected to the plurality of first electrodes and the plurality of second electrodes are formed. The liquid jet head according to claim 1, which is fixed. A first wall surface positioned between the mounting region and the plurality of first drive elements in plan view; and a second wall surface positioned between the mounting region and the plurality of second drive elements in plan view. The liquid jet head according to claim 1, further comprising: a structure including: The pitch at which the first electrode and the second electrode are arranged in the first region and the pitch at which the second electrode and the third electrode are arranged in the second region are equal to each other. The liquid jet head according to claim 1. The liquid ejecting head according to claim 4, wherein a plurality of the third electrodes are arranged at the pitch along the first direction on the opposite side of the second region to the first region. Each of the plurality of drive elements includes a first drive electrode, a piezoelectric body formed on the surface of the first drive electrode in a process including heat treatment, and a second drive formed on the surface of the piezoelectric body. An electrode,
The first electrode is electrically connected to the first drive electrode of the first drive element;
The second electrode is electrically connected to the first drive electrode of the second drive element;
The fourth electrode formed in the same layer as the first drive electrode on the opposite side to the other end with respect to one end in the arrangement of the plurality of first drive elements. The liquid jet head according to any one of 5.   A distance between the first drive electrode of the first drive element and the first drive electrode of the second drive element is wider than a range in which the fourth electrode is distributed along the first direction. The range in which the first electrode exists along the second direction and the range in which the second electrode exists along the second direction overlap with each other in the second direction. The liquid jet head according to any one of 7. A nozzle corresponding to a first drive element located at one end in the first direction among the plurality of first drive elements, and an end on one side in the first direction among the plurality of second drive elements. The imaginary line connecting the nozzle corresponding to the second drive element located in the section is inclined by an angle within a range of 30 ° to 60 ° with respect to the first direction. Any liquid jet head. A liquid ejecting apparatus comprising the liquid ejecting head according to claim 1.

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