JP2008238413A - Wiring member for liquid jet head, and liquid jet head - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a liquid jet head which can contribute to miniaturization. <P>SOLUTION: A plurality of terminal trains 46 each comprised of a plurality of wiring terminals 44 arranged in a row to be joined to driving terminals of piezoelectric elements are set correspondingly to piezoelectric element arrays. Of the terminal trains located at both ends in an arrangement direction of each terminal train 46, at least the terminal train of one end is made a wiring lead-out terminal train 47. At least a part of wiring cables which conduct with respective wiring terminals of the other terminal trains than the wiring lead-out terminal train are led out to the outside of the wiring lead-out terminal train through a gap between adjacent wiring terminals of the wiring lead-out terminal train. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a liquid ejecting head wiring member used for a liquid ejecting head such as an ink jet recording head, and a liquid ejecting head, and in particular, wiring terminals corresponding to piezoelectric elements of the liquid ejecting head are arranged in a line. The present invention relates to a liquid ejecting head wiring member having a wiring terminal array, and a liquid ejecting head including the same.

  By deflecting and deforming a piezoelectric element (a kind of pressure generating element) formed on the surface of the diaphragm, a kind of liquid ejecting head that discharges as a droplet from the nozzle opening by causing a pressure fluctuation in the liquid in the pressure chamber There is one in which droplets are ejected. For example, the liquid ejecting head includes an actuator unit including a pressure chamber and a piezoelectric element, and a flow path unit including a nozzle opening and a common liquid chamber. In this liquid ejecting head, the pressure chamber volume is changed by driving a piezoelectric element by applying a drive signal, pressure fluctuation is generated in the liquid stored in the pressure chamber, and the nozzle opening is generated by using this pressure fluctuation. A droplet is discharged from the nozzle.

  Each of the piezoelectric elements has an element terminal, and wiring of a film-like wiring member (hereinafter referred to as a flexible cable) such as FPC (flexible printing circuit) or TCP (tape carrier package) is provided on the element terminal. Terminals are connected, and a drive signal is supplied from an IC which is a drive circuit via the flexible cable. FIG. 9 shows an example of a conventional flexible cable. The flexible cable 57 is formed by forming a conductor pattern (wiring pattern: not shown) with copper foil on the surface of an insulating film such as polyimide or polyester and covering portions other than the wiring terminal 59 with a resist 58. ing. The portion of the wiring terminal 59 of the flexible cable 57 is pre-soldered, and the flexible cable 57 is attached to the actuator unit by soldering the wiring terminal 59 to the element terminal of the piezoelectric element (for example, , See Patent Document 1). The illustrated flexible cable 57 corresponds to different actuator units in the left half and the right half in FIG. That is, the flexible cable 57 is a common wiring cable for the two actuator units.

JP 2006-281477 A (FIGS. 2 and 3)

  Here, in the flexible cable 57, a wiring pattern is formed in an empty space (wiring space) between the wiring terminal rows 60a to 60d. In this example, there is a wiring space on the left side of the first terminal row 60a, between the second row of terminal rows 60b and the third row of terminal rows 60c, and on the right side of the fourth row of terminal rows 60d. Is provided. For example, in the case where one terminal row 60 is configured by arranging 90 wiring terminals 59, 90 wiring patterns protrude from each terminal row 60 to the wiring space on one side. become. The wiring space between the second terminal row 60b and the third terminal row 60c needs to have a space for forming a total of 180 wiring patterns (the space indicated by the range D in FIG. 9). It was. Further, since the interval between the terminal rows 60b and 60c is required, the arrangement interval of the actuator units (pressure generating element rows) is restricted. As a result, the liquid ejecting head is hindered in size reduction. It was.

  The present invention has been made in view of such circumstances, and an object thereof is to provide a liquid jet head wiring member and a liquid jet head that can contribute to downsizing.

The wiring member for a liquid jet head according to the present invention has been proposed in order to achieve the above object, and is deformed by applying a drive signal through an element terminal to cause pressure fluctuation in the liquid in the pressure chamber. A wiring member that supplies the drive signal to a liquid jet head having a pressure generating element array in which a plurality of pressure generating elements for discharging droplets from a nozzle opening are provided;
A plurality of terminal rows corresponding to each pressure generating element row, each having a plurality of wiring terminals connected to the element terminals of the pressure generating element;
Among the terminal rows located at both ends in the row direction of each terminal row, at least one terminal row is a wiring lead-out terminal row,
At least a part of the wiring that conducts to each wiring terminal of the other terminal row other than the wiring lead terminal row is drawn to the outside of the wiring lead terminal row through a gap between adjacent wiring terminals in the wire lead terminal row. It is characterized by that.

  According to the above configuration, at least one terminal row among the terminal rows located at both ends in the row direction of each terminal row is a wiring lead-out terminal row, and each wiring terminal of the other terminal row other than the wiring lead-out terminal row Since at least a part of the conductive wiring is drawn out of the wiring lead-out terminal row through the gap between adjacent wiring terminals in the wiring lead-out terminal row, the wiring lead-out is performed in other terminal rows other than the wiring lead-out terminal row. Since the number of wires drawn out to the side opposite to the terminal row side can be reduced, the wiring space can be reduced accordingly. Thereby, the space | interval between terminal rows can be narrowed by the part which reduced wiring space. Accordingly, the arrangement interval of the pressure generating element rows can be reduced. As a result, it is possible to contribute to downsizing of the entire liquid ejecting head.

  In the above configuration, in the configuration in which another terminal row exists between the predetermined terminal row and the wiring lead-out terminal row, at least a part of the wiring of each wiring terminal of the predetermined terminal row is connected to the other terminal row. It is possible to adopt a configuration in which the gap between adjacent wiring terminals in the terminal row is passed and the outside is extended to the outside of the wiring lead-out terminal row through the gap between adjacent wiring terminals in the wiring lead-out terminal row.

  According to this configuration, at least a part of the wiring of each wiring terminal in the predetermined terminal row is passed through the gap between the adjacent wiring terminals in the other terminal row, and between the adjacent wiring terminals in the wiring lead-out terminal row. By pulling out to the outside of the wiring lead-out terminal row through the gap, not only in the terminal row next to the wiring lead-out terminal row, but also in a predetermined terminal row in which another terminal row exists between the wiring lead-out terminal row In addition, the number of wires drawn out to the side opposite to the wire lead-out terminal row side can be reduced.

  Moreover, in the said structure, it is desirable to employ | adopt the structure in which the said wiring terminal is formed by adhering a conductive metal by electroless plating.

  According to this configuration, a conductive pattern for plating and a terminal for plating are not required as compared with a configuration employing electrolytic plating, and the degree of freedom in wiring layout is improved accordingly.

  In addition, the liquid jet head according to the present invention is configured to be applied to the pressure generating element through the wiring members having the above-described configurations.

  In this configuration, since the interval between the terminal rows in the wiring member is reduced as compared with the prior art, the arrangement interval of the pressure generating element rows corresponding to each terminal row can be reduced. As a result, the entire liquid ejecting head can be reduced in size.

  In the above configuration, it is desirable to adopt a configuration in which the element terminal of the pressure generating element and the wiring terminal of the liquid jet head wiring member are joined by an anisotropic conductive adhesive.

  According to this configuration, it is possible to use electroless plating for the formation of the wiring terminal because the electrical connection with the element terminal of the pressure generating element can be obtained without using a soldering material for the wiring terminal. Become.

  Furthermore, in the above configuration, each of the pressure generating element rows is suitable for a configuration in which the pressure generating element rows are arranged in a direction perpendicular to the direction in which the pressure generating elements are arranged.

  The best mode for carrying out the present invention will be described below with reference to the accompanying drawings. In the embodiments described below, various limitations are made as preferred specific examples of the present invention. However, the scope of the present invention is not limited to the following description unless otherwise specified. However, the present invention is not limited to these embodiments. In the following description, an ink jet recording head (hereinafter simply referred to as a recording head) mounted on an ink jet recording apparatus (a type of liquid ejecting apparatus; hereinafter simply referred to as a printer) is taken as an example of the liquid ejecting head of the present invention. To do.

  FIG. 1 is an exploded perspective view illustrating an example of the configuration of the recording head 1. The recording head 1 includes a supply needle unit 3 provided with a plurality of ink supply needles 2 for introducing ink (a kind of liquid in the present invention) stored in an ink cartridge (not shown) into the head, and a piezoelectric element 30 ( A head unit 6 including an actuator unit 4 having a kind of pressure generating element (see FIG. 2 and the like) and a flow path unit 5 is schematically provided. Further, in this recording head 1, a metal for protecting the head unit 6 and adjusting the nozzle plate 8 to the ground potential on the tip side of the head case 9 (on the side opposite to the joint surface of the supply needle unit 3). A cover 10 made of metal is attached.

  The supply needle unit 3 is a synthetic resin member in which the ink supply needles 2 are arranged side by side in the head main scanning direction (the nozzle row orthogonal direction). The tip of the ink supply needle 2 disposed in the supply needle unit 3 is pointed in a conical shape so that it can be easily inserted into the ink cartridge. In addition, a plurality of introduction holes communicating with the inside and outside of the ink supply needle 2 are formed at the tip portion, and ink in the ink cartridge is introduced into the head through these introduction holes. Since the recording head 1 of the present embodiment is capable of ejecting four types of ink, the supply needle unit 3 is provided with a total of four ink supply needles 2 with the tip protruding upward. .

  The head case 9 has a base portion 12 to which the supply needle unit 3 and the wiring substrate 11 are attached, and a hollow box-like shape that extends downward from the bottom portion of the base portion 12 and has the head unit 6 attached to the opening surface. It is a member constituted by the case portion 13. In the present embodiment, the head case 9 and the supply needle unit 3 are made of a synthetic resin such as a modified PPE (polyphenylene ether) resin. In the base portion 12 of the head case 9, an upper opening of the case flow path 14 is opened at a position corresponding to each ink supply needle 2 of the supply needle unit 3. Further, the base portion 12 is partitioned with a substrate placement portion 15 for placing the wiring substrate 11.

  The wiring board 11 includes a connector 16 to which a wiring cable (not shown) such as an FFC (flexible flat cable) from the printer main body side is attached. The wiring board 11 is formed with a connection terminal 17, and the connection terminal 17 is a film-like flexible cable 18 such as a TCP (tape carrier package) (corresponding to a kind of wiring member in the present invention). ) Are electrically connected. The wiring board 11 receives a drive signal from the printer body through the FFC and applies the drive signal to the piezoelectric element 30 of the actuator unit 4 through the flexible cable 18. Details of the flexible cable 18 will be described later.

  The nozzle plate 8 is one member constituting the flow path unit 5. In the nozzle plate 8, a plurality of nozzle openings 19 are formed in a row at a pitch corresponding to the dot formation density. In this embodiment, the row of nozzle openings 19 (nozzle row) is in the main scanning direction. Multiple lines (4 rows) are arranged side by side. The nozzle plate 8 is disposed in the flow path unit 5 on the side opposite to the joint surface side of the actuator unit 4.

  FIG. 2 is a cross-sectional view of an essential part for explaining the configuration of the head unit 6, and FIG. 3 is a plan view of the head unit 6. The head unit 6 in the present embodiment is integrally configured with the actuator unit 4 laminated on the upper surface (actuator placement surface) of the flow path unit 5. The flow path unit 5 includes an ink supply port 22 that functions as an orifice and a supply port plate 24 in which a through hole that is a part of the nozzle communication port 23 is formed, and a reservoir 25 that is supplied with ink from the ink supply needle 2 side. (Common liquid chamber) and a reservoir plate 26 in which a through-hole serving as a part of the nozzle communication port 23 is formed, and the nozzle plate 8. The flow path unit 5 is configured such that the nozzle plate 8 is disposed on one surface of the reservoir plate 26 and the supply port plate 24 is disposed on the other surface, and these members are joined together by a heat welding film or the like. ing. The supply port plate 24, the reservoir plate 26, and the nozzle plate 8 are produced, for example, by pressing a metal plate material such as stainless steel. The flow path unit 5 forms an ink flow path (liquid flow path) from the reservoir 25 to the nozzle opening 19.

  The actuator unit 4 includes a pressure chamber plate 29 having a through hole serving as a pressure chamber 28, a transducer plate 31 in which a plurality of piezoelectric elements 30 are mounted side by side, and a part of the pressure chamber 28, and a supply-side communication. A communication hole plate provided with a through hole to be the port 32 and a communication hole plate having a through hole to be the nozzle communication port 23 are provided in a stacked state. The pressure chamber plate 29, the vibrator plate 31, and the communication port plate 34 are made of ceramics such as alumina and zirconium oxide, and are integrated by firing. In the present embodiment, a total of two actuator units 4 are provided on the flow path unit 5 as shown in FIG. One actuator unit 4 is unitized with pressure chambers 28 and piezoelectric elements 30 for two nozzle rows.

  The pressure chamber 28 is a hollow space that is elongated in a direction orthogonal to the nozzle row, and a plurality of pressure chambers 28 are formed corresponding to the nozzle openings 19. One end side of each pressure chamber 28 communicates with the reservoir 25 through the supply side communication port 32 and the ink supply port 22. The other end of the pressure chamber 28 opposite to the supply side communication port 32 communicates with the nozzle opening 19 through the nozzle communication port 23. A part of the pressure chamber 28, that is, a surface opposite to the communication port plate 34 is partitioned by the vibrator plate 31.

  In the present embodiment, the piezoelectric element 30 that functions as a kind of pressure generating element is a so-called bending mode piezoelectric element that performs bending vibration in accordance with an applied electric field. The piezoelectric layer 38 includes a drive electrode 36 and a common electrode 37. It is formed in the state which pinched | interposed. The piezoelectric element 30 is formed on the surface of the transducer plate 31 opposite to the pressure chamber 28 so as to cover the pressure chamber 28. That is, each piezoelectric element 30 is arranged in the nozzle row direction corresponding to each pressure chamber 28 to form a piezoelectric element row 41 (pressure generating element row). In one actuator unit 4, two rows of piezoelectric element rows 41 are formed in a direction perpendicular to the direction in which the piezoelectric elements 30 are arranged (nozzle row direction). Therefore, the head unit 6 is provided with a total of four rows of piezoelectric elements 41.

  On one side in the longitudinal direction of the piezoelectric element 30, an individual drive terminal 39 (a kind of element terminal) is formed for each piezoelectric element 30. The drive terminal 39 is a portion that is electrically connected to the drive electrode 36 of the piezoelectric element 30 and is electrically connected to the wiring terminal 44 (see FIG. 4) of the flexible cable 18. The common electrode 37 is electrically connected to a common ground terminal (a kind of element terminal, not shown) via a common trunk electrode. The drive terminal 39 and the common ground terminal are made of a metal material, and are formed on the surface of the actuator unit 4 by, for example, screen printing. Each drive terminal 39 and the common ground terminal are arranged in the nozzle row direction to form a drive terminal row 40. The drive terminal row 40 is formed in two rows near the center of the actuator unit 4 in the width direction. Has been. Therefore, the head unit 6 is provided with a total of four drive terminal rows 40.

  When a drive signal is applied to the drive electrode 36 through the drive terminal 39, an electric field corresponding to the potential difference is generated between the drive electrode 36 and the common electrode 37. This electric field is applied to the piezoelectric layer 38, and the piezoelectric layer 38 bends and deforms according to the strength of the applied electric field. That is, as the potential applied to the piezoelectric element 30 is increased to the plus side, the piezoelectric element 30 is displaced in a direction closer to the flow path unit 5 and the transducer plate 31 is deformed so as to reduce the volume of the pressure chamber 28. Let On the other hand, as the electric potential applied to the piezoelectric element 30 is lowered to the minus side, the piezoelectric element 30 is displaced away from the flow path unit 5 and the vibrator plate 31 is moved so as to increase the volume of the pressure chamber 28. Deform. By the operation of the piezoelectric element 30, the pressure chamber 28 contracts or expands, thereby causing a pressure variation in the ink in the pressure chamber 28. By utilizing this pressure fluctuation, the ink in the pressure chamber 28 can be ejected from the nozzle opening 19 as ink droplets.

  FIG. 4 is an enlarged view of a main part for explaining the configuration of the flexible cable 18, and shows a tip side portion connected to the piezoelectric element 30. In the flexible cable 18, a wiring pattern (conductor pattern) 42 is formed of a conductive material such as copper foil on the surface of a base film 43 made of an insulating film such as polyimide, and portions other than the wiring terminals 44 are covered with a resist. It is configured. The flexible cable 18 is mounted with an IC chip (not shown) that performs control to selectively supply a drive signal from the wiring board 11 side to the piezoelectric element 30. The flexible cable 18 in this embodiment is a single cable common to two adjacent actuator units 4, and the left half and the right half correspond to one actuator 4 in FIG. 4. Each wiring terminal 44 of the flexible cable 18 is provided in a plurality of rows corresponding to each drive terminal 39 of the actuator unit 4 to form a terminal row 46. A total of four terminal rows 46 are formed corresponding to the drive terminal rows 40 of the two actuator units 4. In FIG. 4, a part of the wiring terminals 44 in each terminal row 46 is shown.

  In the present embodiment, as will be described later, an anisotropic conductive adhesive is used for joining the drive terminal 39 and the wiring terminal 44 of the piezoelectric element 30. By employing this anisotropic conductive adhesive, electrical connection with the drive terminal 39 can be achieved without using a soldering material for the wiring terminal 44. A conductive metal is fixed to the surface of the wiring terminal 44 by electroless plating. Specifically, a compound that dissolves in a solvent containing a conductive metal (for example, nickel or tin) and a reducing agent are dissolved in the liquid, and the base of the cable is immersed in the liquid to deposit the metal on the wiring terminal 44. By using this electroless plating, there is no need to provide a conductive pattern for plating or a conductive terminal for plating as in the case of forming a terminal by electrolytic plating, and between adjacent adjacent terminal rows 46. There is no need to provide a slit.

  That is, in the conventional flexible cable 57 shown in FIG. 9, as shown in the enlarged view shown in FIG. 5 (enlarged view of the region A in FIG. 9), between the adjacent terminal rows 60, the trunk electrode common to both terminal rows is provided. 61 was provided, and the main electrode 61 was provided with a current-carrying terminal 62 used during electrolytic plating. Then, after each terminal row 60 is plated through the energizing terminal 62 and the trunk electrode 61, the both terminal rows 60 are divided by providing slits S in the hatched portions in the figure.

  On the other hand, in the flexible cable 18 according to the present invention, a metal film can be individually formed on each terminal 44 by electroless plating without using a current-carrying terminal or a trunk electrode. There is no need to provide a slit between them. For this reason, the part which was a slit conventionally can be utilized as a space for wiring. That is, the degree of freedom of wiring layout is improved. The flexible cable 18 uses the portion that was the slit as a wiring space and devise the wiring layout to reduce the arrangement interval of the terminal rows 44.

  Here, in the flexible cable 18, at least one terminal row among the terminal rows located at both ends in the arrangement direction of each terminal row 46 functions as the wiring lead-out terminal row in the present invention. In the example of FIG. 4, the terminal row 46 located at the left end is a wiring lead-out terminal row 47. Then, at least a part of the wiring that conducts to each wiring terminal 44 of the other terminal row 46 other than the wiring lead terminal row 47 is passed through the gap between the adjacent wiring terminals 44 in the wiring lead terminal row 47. The terminal line 47 is drawn to the outside (side). More specifically, as shown in FIG. 4, a part of the wiring terminals 44 in the terminal row 46 (terminal row 46a) on the right side of the wiring lead-out terminal row 47, for example, 50 out of 90 wires Is drawn to the left side of the wiring lead-out terminal row 47 through the space between the terminal rows, that is, the gap between the wiring lead-out terminal row 47 and the wiring lead-out terminal row 47.

  By laying out the wiring in this way, the number of wirings to be drawn from the terminal row 46a to the side (right side) opposite to the wiring lead-out terminal row 47 can be reduced. The wiring space on the right side can be reduced. Thereby, the space | interval Dx between the terminal rows 44 located on the right side of the terminal row 46a can be narrowed. As a result, the interval between the adjacent actuator units 4 in the recording head 1 (the interval between the pressure generating element arrays) can be reduced, thereby contributing to the miniaturization of the entire recording head 1.

  In the example of FIG. 4, only the terminal row 44 located at the left end is used as the wiring lead-out terminal row 47, but of course, the terminal row 44 located at the right end is also used as the wiring lead-out terminal row 47. A configuration in which the wiring is drawn out to the right side of the wiring lead-out terminal row 47 can also be adopted. Further, the configuration in which one flexible cable 18 is used for the two actuator units 4 is illustrated, but the present invention is not limited to this, and as shown in FIG. 6, individual flexible cables 18 (18 a, 18 b) for each actuator 4. ) May be adopted. Also in this configuration, by arranging the wiring patterns of the cables 18a and 18b to the sides opposite to each other, the arrangement interval Dz of the cables 18a and 18b can be reduced as much as possible. As a result, the recording head 1 can be reduced in size.

  Next, the joining of the wiring terminal 44 of the flexible cable 18 and the drive terminal 39 of the piezoelectric element 30 will be described. In the present embodiment, as described above, an anisotropic conductive adhesive (anisotropic conductive adhesive film) is employed for joining between the terminals 44 and 39. As shown in FIG. 7A, the anisotropic conductive adhesive 49 is configured by dispersing conductive particles 51 in an adhesive resin 50. As the adhesive resin 50, an epoxy thermosetting resin is mainly used. Further, as the conductive particles 51, for example, particles made of a metal such as a tin-nickel alloy or nickel, particles obtained by applying nickel or nickel / gold plating to a core resin such as styrene, divinylbenzene, or benzoguanamine are used. . Then, as shown in FIG. 7B, heat and pressure are applied while the anisotropic conductive adhesive 49 is interposed between the wiring terminal 44 of the flexible cable 18 and the drive terminal 39 of the piezoelectric element 30. In addition, when cured, the conductive particles 51 are sandwiched between both terminals. The conductive particles 51 can make the wiring terminal 44 and the drive terminal 39 conductive.

  By the way, the present invention is not limited to the above-described embodiment, and various modifications can be made based on the description of the scope of claims.

  FIG. 8 is an enlarged view of a main part for explaining the configuration of the flexible cable 18 ′ in the second embodiment of the present invention. The flexible cable 18 ′ in the second embodiment has a total of three terminal rows 46 arranged side by side. In the present embodiment, among the three terminal rows 46, the terminal row 46 located at the left end functions as the wiring lead-out terminal row 47. As in the first embodiment, a part of the wiring terminals 44 in the terminal row 46 a located on the right side of the wiring lead-out terminal row 47 is passed through the gap between the wiring terminals 44 in the wiring lead-out terminal row 47. The wiring lead-out terminal row 47 is pulled out to the left side. Further, in the present embodiment, a part of the wiring terminals 44 of the terminal row 46 b located at the right end is passed through the gap between the wiring terminals 44 of the terminal row 46 a and between the wiring terminals 44 of the wiring lead-out terminal row 47. The wiring lead-out terminal row 47 is led out to the left side through the gap.

  Thus, in the configuration in which another terminal row (terminal row 46a) exists between the predetermined terminal row (terminal row 46b) and the wiring lead-out terminal row (47), the wiring of each wiring terminal of the predetermined terminal row Adopting a configuration in which at least a part of the wire is passed through the gap between the adjacent wiring terminals in the other terminal row and drawn out to the outside of the wiring lead-out terminal row through the gap between the adjacent wiring terminals in the wire drawing terminal row. Can do. That is, as long as the wires can pass between adjacent wiring terminals in the wiring lead-out terminal row without contacting each other, the wirings of the plurality of terminal rows can be drawn out to the outside of the wiring lead-out terminal row. As a result, not only in the terminal row adjacent to the wiring lead-out terminal row, but also in a predetermined terminal row in which another terminal row exists between the wiring lead-out terminal row and the side opposite to the wiring lead-out terminal row side. The number of wires to be drawn can be reduced.

  In the above description, the ink jet recording head 1 has been described as an example of the liquid ejecting head, but the present invention can also be applied to other liquid ejecting heads. For example, a color material ejecting head used for manufacturing a color filter such as a liquid crystal display, an electrode material ejecting head used for forming an electrode such as an organic EL (Electro Luminescence) display, an FED (surface emitting display), a biochip (biochemical element) The present invention can also be applied to bioorganic matter ejecting heads and the like used in the production of

FIG. 2 is an exploded perspective view illustrating a configuration of a recording head. It is principal part sectional drawing explaining the structure of a head unit. It is a top view of a head unit. It is a principal part enlarged view explaining the structure of a flexible cable. It is a schematic diagram explaining the process of forming a terminal by the conventional electrolytic plating. It is a principal part enlarged view explaining the structure of the modification of a flexible cable. It is a schematic diagram explaining the process of joining a wiring terminal and a drive terminal with an anisotropic conductive adhesive. It is a principal part enlarged view explaining the structure of the flexible cable in 2nd Embodiment. It is a figure explaining the structure of the conventional flexible cable.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Recording head, 4 ... Actuator unit, 6 ... Head unit, 18 ... Flexible cable, 30 ... Piezoelectric element, 39 ... Drive terminal, 40 ... Drive terminal row, 41 ... Piezoelectric device row, 42 ... Wiring pattern, 44 ... Wiring Terminals, 46... Terminal row, 47 .. wiring lead terminal row, 49... Anisotropic conductive adhesive, 50 .adhesive resin, 51.

Claims (6)

A pressure generating element array formed by arranging a plurality of pressure generating elements for deforming when a drive signal is applied through an element terminal and causing pressure fluctuations in the liquid in the pressure chamber to eject droplets from the nozzle openings. A wiring member for supplying the drive signal to the liquid jet head provided,
A plurality of terminal rows corresponding to each pressure generating element row, each having a plurality of wiring terminals connected to the element terminals of the pressure generating element;
Among the terminal rows located at both ends in the row direction of each terminal row, at least one terminal row is a wiring lead-out terminal row,
At least a part of the wiring that conducts to each wiring terminal of the other terminal row other than the wiring lead terminal row is drawn to the outside of the wiring lead terminal row through a gap between adjacent wiring terminals in the wire lead terminal row. A wiring member for a liquid jet head, comprising:   In a configuration in which another terminal row exists between a predetermined terminal row and the wiring lead-out terminal row, at least a part of the wiring of each wiring terminal of the predetermined terminal row is adjacent to the other terminal row. 2. The wiring member for a liquid jet head according to claim 1, wherein the wiring member is pulled out to the outside of the wiring lead-out terminal row through a gap between adjacent wiring terminals and through a gap between adjacent wiring terminals in the wiring lead-out terminal row. .   The liquid jet head wiring member according to claim 1, wherein the wiring terminal is formed by fixing a conductive metal by electroless plating. A plurality of rows of pressure generating elements for deforming the drive signal from the signal supply source through the element terminals to cause pressure fluctuations in the liquid in the pressure chamber and ejecting droplets from the nozzle openings are provided. A liquid ejecting head including a pressure generating element array,
A liquid ejecting head, wherein the driving signal is applied to each pressure generating element through the liquid ejecting head wiring member according to any one of claims 1 to 3.   The liquid ejecting head according to claim 4, wherein the element terminal of the pressure generating element and the wiring terminal of the liquid ejecting head wiring member are joined by an anisotropic conductive adhesive. 6. The liquid jet head according to claim 4, wherein each of the pressure generating element arrays is arranged in a direction orthogonal to a direction in which the pressure generating elements are arranged.

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