JP7002012B2 - Liquid discharge device - Google Patents

Description

The present invention relates to a liquid discharge device that discharges a liquid.

Patent Document 1 discloses an inkjet head of an inkjet printer, which ejects ink to a recording medium while moving in the scanning direction as a liquid ejection device. The inkjet head of Patent Document 1 includes a nozzle plate, a flow path forming substrate, a plurality of piezoelectric elements, and the like. A plurality of nozzles are formed on the nozzle plate. The flow path forming substrate is made of a silicon single crystal substrate and is joined to the nozzle plate. The flow path forming substrate is formed with a plurality of pressure chambers communicating with each of the plurality of nozzles and a manifold for supplying ink to the plurality of pressure chambers. The plurality of piezoelectric elements are arranged on the upper surface of the flow path forming substrate corresponding to the plurality of pressure chambers.

In Patent Document 1, not only a plurality of pressure chambers but also a manifold having a large volume (area) is formed on the flow path forming substrate, so that the size of the flow path forming substrate becomes large. Here, the flow path forming substrate is manufactured by forming a piezoelectric element on a silicon wafer and then cutting the wafer into a predetermined size. As described above, since there is a film forming process of the piezoelectric element, the cost per wafer as the flow path forming substrate is high. Therefore, it is preferable to reduce the size of the flow path forming substrate as much as possible for the purpose of increasing the number of flow path forming substrates taken from one wafer to reduce the cost.

In this regard, Patent Document 2 discloses an inkjet head formed on a substrate in which a plurality of pressure chambers and a manifold are different from each other. The inkjet head of Patent Document 2 includes a pressure chamber forming substrate (upper substrate) in which a plurality of pressure chambers are formed, a communication substrate (intermediate substrate) in which a manifold and a plurality of communication channels are formed, and a plurality of nozzles. It includes a formed nozzle plate (lower substrate) and a plurality of piezoelectric elements provided in the pressure chamber forming substrate.

The pressure chamber forming substrate, the communication substrate, and the nozzle plate are each made of a silicon substrate. A plurality of nozzles formed on the nozzle plate are arranged in two rows. A plurality of pressure chambers formed on the pressure chamber forming substrate are also arranged in two rows according to the arrangement of the nozzles. The communication substrate is arranged between the pressure chamber forming substrate and the nozzle plate, and overhangs on both sides of the pressure chamber forming substrate in the direction orthogonal to the arrangement direction of the pressure chambers. Two manifolds corresponding to the two pressure chamber rows are formed in the two overhanging portions on both sides of the communication board, and a plurality of communication flow paths are formed between the two manifolds. The nozzle plate is joined to a region of the communication board in which a plurality of communication flow paths are formed, and the plurality of communication flow paths of the communication board and the plurality of nozzles of the nozzle plate communicate with each other.

The plurality of piezoelectric elements are arranged in two rows on the upper surface of the pressure chamber forming substrate according to the arrangement of the pressure chambers. Wiring is connected to each piezoelectric element, and the wiring is drawn inside two rows of piezoelectric elements. Further, a wiring member is joined to the region between the two rows of piezoelectric element rows of the pressure chamber forming substrate. The wiring member is electrically connected to the wiring drawn from the piezoelectric element.

In the configuration of Patent Document 2, a plurality of pressure chambers and manifolds are formed on different substrates. That is, since the manifold is not formed on the pressure chamber forming substrate, the pressure chamber forming substrate on which the piezoelectric element is formed can be miniaturized.

Japanese Patent Application Laid-Open No. 2003-246065 Japanese Unexamined Patent Publication No. 2014-54435

In the inkjet head of Patent Document 2 described above, it is possible to reduce the cost by downsizing the pressure chamber forming substrate (upper substrate) as compared with Patent Document 1, but there is room for further cost reduction.

The nozzle plate (lower substrate) of Patent Document 2 is made of a silicon substrate, and a nozzle is formed on the silicon substrate by dry etching. More specifically, in order to form a nozzle having a high aspect ratio, a nozzle is formed by performing deep etching processing such as Bosch process processing. Since such processing is performed, the manufacturing cost per wafer to be the nozzle plate becomes high. Further, since a polishing process for thinning the nozzle plate is required, the manufacturing cost per wafer is high. Therefore, it is preferable to reduce the size of one nozzle plate as much as possible so that as many nozzle plates as possible can be cut out from one wafer.

However, in Patent Document 2, the wiring connected to each piezoelectric element is drawn out in the region between the two piezoelectric element rows of the pressure chamber forming substrate, and the wiring member is joined to the region. In this relationship, it is necessary to separate the distance between the two piezoelectric element rows, that is, the distance between the two pressure chamber rows by a certain amount or more, and accordingly, the distance between the two nozzle rows of the nozzle plate also increases. This increases the size of the nozzle plate.

An object of the present invention is to reduce the size of the upper substrate on which the piezoelectric element is arranged and also to reduce the size of the lower substrate on which the nozzle is formed.

Means for Solving Problems and Effects of Invention

The liquid discharge device of the present invention is
A plurality of first pressure chambers arranged in the first direction, and a plurality of second pressure chambers arranged in the first direction and arranged at positions deviated from the second direction orthogonal to the first direction. A top substrate having a plurality of first piezoelectric elements corresponding to the plurality of first pressure chambers and a plurality of second piezoelectric elements corresponding to the plurality of second pressure chambers, and the first pressure chamber. A plurality of first through holes communicating with the first manifold communicating with the first manifold, a plurality of first through holes communicating with the first manifold at a position different from the communication position with the first manifold of the first pressure chamber, and a second manifold communicating with the second pressure chamber. An intermediate substrate having a plurality of second through holes communicating with the second pressure chamber at a position different from the communication position with the second manifold, and having a width larger than that of the upper substrate in the second direction. A lower substrate having a plurality of first nozzles communicating with the first through hole and a plurality of second nozzles communicating with the second through hole, and having a width smaller than that of the intermediate substrate in the second direction. The upper substrate comprises a liquid discharge head having a , It is characterized in that a plurality of individual wirings are formed.
In another aspect, the liquid discharge device of the present invention is displaced from a plurality of first pressure chambers arranged in the first direction in a second direction arranged in the first direction and orthogonal to the first direction. It has a plurality of second pressure chambers arranged at different positions, and a plurality of first piezoelectric elements corresponding to the plurality of first pressure chambers and a plurality of second piezoelectric elements corresponding to the plurality of second pressure chambers. A plurality of first through holes communicating with each other at a position different from the communication position between the upper substrate on which the above is formed, the first manifold communicating with the first pressure chamber, and the first manifold of the first pressure chamber. It has a second manifold that communicates with the second pressure chamber and a plurality of second through holes that communicate with each other at a position different from the communication position of the second pressure chamber with the second manifold. Also has an intermediate substrate having a large width in the second direction, a plurality of first nozzles communicating with the first through hole, and a plurality of second nozzles communicating with the second through hole, from the intermediate substrate. Also provided with a liquid discharge head having a lower substrate having a smaller width in the second direction.
The upper substrate is formed with a plurality of individual wirings extending from each of the plurality of first piezoelectric elements and each of the plurality of second piezoelectric elements toward a contact arranged on one end side in the second direction. The first pressure chamber and the second pressure chamber of the liquid discharge head are arranged so as to be offset to the side opposite to the contact in the second direction.
From yet another aspect, the liquid discharge device of the present invention has a plurality of first pressure chambers arranged in the first direction and a second direction arranged in the first direction and orthogonal to the first direction. It has a plurality of second pressure chambers arranged at offset positions, a plurality of first piezoelectric elements corresponding to the plurality of first pressure chambers, and a plurality of second piezoelectric elements corresponding to the plurality of second pressure chambers. The first substrate on which the element is formed is provided, and the first substrate is provided.
The first substrate has a first end and a second end which are both ends in the second direction, and a first pressure chamber of one of the plurality of first pressure chambers is both ends in the second direction. It has three ends and a fourth end, and the second pressure chamber of one of the plurality of second pressure chambers has the fifth end and the sixth end which are both ends in the second direction, and the first end. The second end, the third end, the fourth end, the fifth end, and the sixth end are the first end, the third end, and the fourth end in the second direction. The fifth end, the sixth end, and the second end are arranged in this order, and the distance from the first end to the third end is larger than the distance from the sixth end to the second end. It is a feature.

In the present invention, the substrate (upper substrate) in which the first pressure chamber and the second pressure chamber arranged in the second direction are formed and the substrate (intermediate substrate) in which the manifold communicating with the pressure chamber is formed are separated. .. That is, the size of the upper substrate can be reduced because the manifold is not formed on the upper substrate. Further, in the present invention, the individual wiring drawn from the piezoelectric element corresponding to the first pressure chamber and the individual wiring drawn from the piezoelectric element corresponding to the second pressure chamber are both for a plurality of piezoelectric elements. It is pulled out toward a contact located on one side of the second direction. That is, no contact (connection portion with the wiring member) is arranged between the first pressure chamber and the second pressure chamber. Therefore, the first pressure chamber and the second pressure chamber can be brought close to each other to narrow the distance between the nozzle communicating with the first pressure chamber and the nozzle communicating with the second pressure chamber in the second direction. As a result, the width of the lower substrate in the second direction can also be reduced.

It is a schematic top view of the printer which concerns on this embodiment. It is sectional drawing of the carriage which attached the four ejection heads of an inkjet head. FIG. 3 is a cross-sectional view of the carriage when the cap is in the cap position. It is a top view of one ejection head of an inkjet head. FIG. 6 is a sectional view taken along line VV of FIG. It is a top view of the discharge head (upper substrate). (A) is a sectional view taken along line AA of FIG. 6, and (b) is a sectional view taken along line BB of FIG. It is sectional drawing of the carriage of a modified form. It is sectional drawing of the carriage of another modified form. It is a schematic top view of another modified form of a printer.

Next, an embodiment of the present invention will be described. FIG. 1 is a schematic top view of the printer according to the present embodiment. First, a schematic configuration of the inkjet printer 1 will be described with reference to FIG. The front, back, left, and right directions shown in FIG. 1 are defined as "front", "rear", "left", and "right" of the printer. In addition, the front side of the paper is defined as "top" and the other side of the paper is defined as "bottom". Then, in the following, each direction word of front, back, left, right, up and down will be described as appropriate.

<Outline configuration of printer>
As shown in FIG. 1, the inkjet printer 1 includes a platen 2, a carriage 3, an inkjet head 4, a cartridge holder 5, a transport mechanism 6, a maintenance device 7, a control device 8, and the like.

A recording sheet 100, which is a recording medium, is placed on the upper surface of the platen 2. The carriage 3 is configured to be reciprocating in the left-right direction (hereinafter, also referred to as a scanning direction) along the two guide rails 10 and 11 in the region facing the platen 2. An endless belt 14 is connected to the carriage 3, and the carriage 3 is driven by the carriage drive motor 15 to move the carriage 3 in the scanning direction.

FIG. 2 is a cross-sectional view of a carriage 3 to which the four ejection heads 20 of the inkjet head 4 are attached. The inkjet head 4 is attached to the carriage 3 and moves in the scanning direction together with the carriage 3. As shown in FIG. 2, the inkjet head 4 includes four ejection heads 20 arranged in the scanning direction. The inkjet head 4 is connected to a cartridge holder 5 (see FIG. 1) in which ink cartridges 17 of four colors (black, yellow, cyan, magenta) are mounted by a tube (not shown). Each discharge head 20 has a plurality of nozzles 30 formed on the lower surface thereof. The nozzle 30 of each ejection head 20 ejects the ink supplied from the ink cartridge 17 toward the recording paper 100 mounted on the platen 2. The details of the ejection head 20 of the inkjet head 4 will be described later.

The transport mechanism 6 has two transport rollers 18 and 19 arranged so as to sandwich the platen 2 in the front-rear direction. The transport mechanism 6 transports the recording paper 100 mounted on the platen 2 forward (hereinafter, also referred to as a transport direction) by the two transport rollers 18 and 19.

The maintenance device 7 is for performing suction purging for the purpose of maintaining and recovering the ejection performance of the inkjet head 4, and is arranged at a position on the right side of the platen 2 in the movement range of the carriage 3 in the scanning direction. ing. As shown in FIGS. 1 and 3, the maintenance device 7 includes a cap 21 and a suction pump 22. FIG. 3 is a cross-sectional view of the carriage 3 when the cap 21 is in the cap position. The cap 21 is driven in the vertical direction by a cap drive motor (not shown). As a result, the cap 21 has a cap position (the position of the solid line in FIG. 3) that covers the nozzles 30 of the four ejection heads 20 of the inkjet head 4 and an uncap position (the position of the two-dot chain line in FIG. 3) away from the inkjet head 4. Position) and can be moved to. The suction pump 22 is connected to the discharge port 21a of the cap 21 by a tube 23.

The operation of the maintenance device 7 at the time of suction purging is as follows. When the carriage 3 is on the right side of the platen 2 at a position facing the cap 21, the cap drive motor drives the cap 21 upward. As a result, the cap 21 rises to the cap position and covers the nozzles 30 of the four discharge heads 20. In this state, when the space inside the cap 21 is depressurized by the suction pump 22, ink is forcibly discharged from each nozzle 30. At this time, dust, air bubbles, or thickened ink existing in the ink flow path in the ejection head 20 are ejected together.

The control device 8 includes a ROM (Read Only Memory), a RAM (Random Access Memory), an ASIC (Application Specific Integrated Circuit) including various control circuits, and the like. The control device 8 executes various processes such as printing on the recording paper 100 and maintenance of the inkjet head 4 by the ASIC according to the program stored in the ROM.

For example, in the printing process, the control device 8 controls the inkjet head 4, the carriage drive motor 15, and the like based on a printing command input from an external device such as a PC to print an image or the like on the recording paper 100. .. Specifically, the ink ejection operation of ejecting ink while moving the inkjet head 4 together with the carriage 3 in the scanning direction and the conveying operation of conveying a predetermined amount of the recording paper 100 in the conveying direction by the conveying rollers 18 and 19 are alternately performed. Let me do it. Further, in the maintenance process, the control device 8 controls the cap drive motor for driving the cap 21 up and down and the suction pump 22 to perform the suction purge described above.

<Details of inkjet head>
Next, the detailed configuration of the inkjet head 4 will be described. As shown in FIG. 2, a plate-shaped unit holder 33 is provided at the lower part of the carriage 3, and four discharge heads 20 are attached side by side in the scanning direction on the upper surface of the unit holder 33. Further, the carriage 3 is provided with a circuit board 34 arranged above the four discharge heads 20 so as to straddle the four discharge heads 20. Further, the circuit board 34 and the four discharge heads 20 are each connected by a COF 35 (Chip On Film) which is a wiring member. The circuit board 34 is electrically connected to the control device 8 (see FIG. 1) of the printer 1, and receives a command from the control device 8 to output various control signals to each discharge head 20.

A plurality of nozzles 30 are formed on the lower surface of each discharge head 20. The plurality of nozzles 30 of each discharge head 20 are exposed from the openings formed in the unit holder 33. FIG. 4 is a top view of one ejection head 20 of the inkjet head 4. As shown in FIG. 4, the plurality of nozzles 30 are arranged along the transport direction to form two nozzle rows 31 (31a, 31b). The positions of the nozzles 30 are displaced in the transport direction between the two nozzle rows 31a and 31b, and the plurality of nozzles 30 are arranged in a so-called staggered pattern.

The two nozzle rows 31 of one ejection head 20 each eject inks of different colors. In the following description, among the components of the printer 1, those corresponding to the black (K), yellow (Y), cyan (C), and magenta (M) inks are designated by reference numerals indicating the components. After, a symbol of "k" indicating black, "y" indicating yellow, "c" indicating cyan, or "m" indicating magenta is added as appropriate so that which ink corresponds to which ink is used. .. For example, the nozzle row 31k shown in FIG. 2 refers to the nozzle row 31 that ejects black ink.

Four types of nozzle rows 31 for ejecting four colors of ink are arranged symmetrically in the entire four ejection heads 20. Specifically, of the four ejection heads 20, each of the ejection head 201 and the ejection head 202 arranged inside in the scanning direction has a black nozzle row 31k located inside and a magenta nozzle located outside. It has a row of 31 m. Further, the discharge head 203 arranged on the left side of the discharge head 201 and the discharge head 204 arranged on the right side of the discharge head 202, that is, each of the two outer discharge heads 203 and 204 are cyan nozzles located inside. It has a row 31c and a yellow nozzle row 31y located on the outside.

That is, in the entire inkjet head 4 having the four ejection heads 20, there are two nozzle rows 31 for one color of ink, for a total of eight nozzle rows 31. The eight nozzle rows 31 are arranged in the order of the black nozzle row 31k, the magenta nozzle row 31m, the cyan nozzle row 31c, and the yellow nozzle row 31y from the inside to the left and right sides. In FIG. 2, for the nozzles 30 and the nozzle row 31 of each color, those arranged on the left side are designated by the reference numeral “1”, and those arranged on the right side are designated by the reference numeral “2”. is doing. For example, the nozzle 30c1 is a nozzle 30 that is arranged on the left side and ejects cyan ink.

That is, the nozzle rows 31 of four colors are arranged symmetrically in the order of black, magenta, cyan, and yellow from the center side. In the above configuration, the landing order of the four colors of ink on the recording paper 100 can be the same depending on whether the carriage 3 moves to the left or to the right. As a result, in bidirectional printing, the difference in color between the image portion formed when the carriage 3 moves to the left and the image portion formed when the carriage 3 moves to the right can be suppressed to a small extent. It will be possible.

<Discharge head configuration>
Next, a specific configuration of the discharge head 20 will be described. Since the structures of the four ejection heads 20 of the inkjet head 4 are the same, one of them will be described. FIG. 5 is a sectional view taken along line VV of FIG. FIG. 6 is a top view of the discharge head 20 (upper substrate 46). 7 (a) is a sectional view taken along line AA of FIG. 6, and FIG. 7 (b) is a sectional view taken along line BB of FIG. In FIG. 6, the protective member 42 shown in FIGS. 5 and 7 is schematically shown by a two-dot chain line.

As shown in FIGS. 4 and 5, the discharge head 20 has a holder member 40 and a head main body 43 held by the holder member 40. The holder member 40 is made of synthetic resin, metal, or the like. Two ink supply flow paths 44 are formed in two portions of the holder member 40 that sandwich the head main body 43 in the scanning direction (left-right direction).

A through hole 34a is formed in the circuit board 34 arranged above the discharge head 20, and in the through hole 34a, a cylindrical flow path member 41 for supplying ink to the discharge head 20 forms the circuit board 34. It penetrates. The ink supply flow path 44 of the holder member 40 is connected to the cartridge holder 5 (see FIG. 1) via the above-mentioned flow path member 41. Then, the inks of the two-color (black and magenta, or cyan and yellow) ink cartridges 17 mounted on the cartridge holder 5 are supplied to the head body 43 via the ink supply flow path 44, respectively. Further, the circuit board 34 is also formed with a through hole 34b for passing the COF 35 connected to the piezoelectric actuator 49 of the head main body 43.

The head main body 43 has an upper substrate 46, an intermediate substrate 47, a lower substrate 48, and a piezoelectric actuator 49. The upper substrate 46, the intermediate substrate 47, and the lower substrate 48 each have a flow path hole that is a part of the ink flow path. The upper substrate 46, the intermediate substrate 47, and the lower substrate 48 are each made of a silicon single crystal substrate.

As shown in FIGS. 5 to 7, a plurality of pressure chambers 51 are formed on the upper substrate 46. The plurality of pressure chambers 51 are a plurality of first pressure chambers 51a arranged in the transport direction and a plurality of second pressure chambers arranged in the transport direction at positions shifted to the left of the plurality of first pressure chambers 51a. Includes 51b. Each pressure chamber 51 has a rectangular planar shape that is long in the scanning direction.

The upper substrate 46 has a vibrating film 57 that covers a plurality of pressure chambers 51 (first pressure chamber 51a, second pressure chamber 51b). The vibrating film 57 is a film made of silicon dioxide (SiO ₂ ) or silicon nitride (SiNx) formed by oxidizing or nitriding a part of the silicon upper substrate 46. On the upper surface of the left end portion of the upper substrate 46, an electrical connection portion 70 in which the contacts 71a, 71b, 72 of the piezoelectric actuator 49 described later are arranged is provided. A COF 35 is joined to the electrical connection portion 70.

The intermediate substrate 47 is joined to the lower surface of the upper substrate 46. Two ink supply holes 50 (50a, 50b) communicating with the two ink supply flow paths 44 are formed on the upper surface of the intermediate substrate 47. Further, the intermediate substrate 47 is formed with two left and right manifolds 52 (52a, 52b) that communicate with the two ink supply holes 50, respectively. The first manifold 52a on the right side overlaps with the outer end portion (right end portion) in the scanning direction of the plurality of first pressure chambers 51a, and extends in the transport direction (vertical direction on the paper surface in FIG. 5). The second manifold 52b on the left side overlaps with the outer end portion (left end portion) of the plurality of second pressure chambers 51b in the scanning direction and extends in the transport direction. The manifolds 52a and 52b of the intermediate substrate 47 are arranged so as to project to the left and right of the pressure chambers 51a and 51b. Therefore, the width of the intermediate substrate 47 in the scanning direction is larger than the width of the upper substrate 46 in the scanning direction. Then, in the region on the upper surface of the intermediate substrate 47 outside the upper substrate 46 in the scanning direction, the first ink supply hole 50a communicating with the first manifold 52a and the second ink supply hole 50b communicating with the second manifold 52b are formed. And are formed.

The underside of each manifold 52 is covered with a synthetic resin film 56. A unit holder 33 for holding the discharge head 20 is arranged on the lower side of the film 56. The intermediate substrate 47 has a plurality of first communication holes 53a for communicating the outer end portion (right end portion) of the plurality of first pressure chambers 51a and the first manifold 52a, and the outer end portions of the plurality of second pressure chambers 51b. A plurality of second communication holes 53b are formed to communicate the (left end portion) and the second manifold 52b. Further, the intermediate substrate 47 has a plurality of first through holes 54a communicating with the inner end portions (left end portions) of the plurality of first pressure chambers 51a, and inner end portions (right end portions) of the plurality of second pressure chambers 51b. A plurality of second through holes 54b communicating with the above are formed.

The lower substrate 48 is joined to the lower surface of the intermediate substrate 47. The lower substrate 48 is formed with a plurality of first nozzles 30a communicating with each of the plurality of first through holes 54a of the intermediate substrate 47, and a plurality of second nozzles 30b communicating with each of the plurality of second through holes 54b. Has been done. As shown in FIG. 4, a plurality of first nozzles 30a constitute a first nozzle row 31a, and a plurality of second nozzles 30b form a second nozzle row 31b that is aligned with the first nozzle row 31a in the scanning direction. ing. As shown in FIG. 5, the lower substrate 48 is not joined to the entire lower surface of the intermediate substrate 47, but a plurality of communication holes 54 are formed between the two manifolds 52 of the intermediate substrate 47. It is joined only to a part of the area. That is, the lower substrate 48 does not overlap the two manifolds 52. Further, the lower substrate 48 does not overlap with the electrical connection portion 70 of the upper substrate 46 in which a plurality of contacts 71 and 72 are arranged in the vertical direction which is the stacking direction of the substrates 46 to 48. As a result, the width of the lower substrate 48 in the scanning direction is smaller than the width of the upper substrate 46 and the width of the intermediate substrate 47.

The two nozzle rows 31a and 31b formed on the lower substrate 48 are arranged on the side opposite to the electrical connection portion 70 with respect to the center line C of the discharge head 20 in the scanning direction. The reason why the nozzle rows 31 are arranged offset in the scanning direction will be described in detail later. Further, as shown in FIG. 2, of the four ejection heads 20, in the inner two ejection heads 201 and 202, the two nozzle rows 31 are arranged one-sided inward. On the other hand, in the two outer discharge heads 203 and 204, the two nozzle rows 31 are arranged on the outer side.

The piezoelectric actuator 49 applies ejection energy for ejecting ink from the nozzles 30 to the inks in the plurality of pressure chambers 51, respectively. As shown in FIGS. 5 to 7, the piezoelectric actuator 49 is arranged on the upper surface of the vibrating membrane 57 of the upper substrate 46. The piezoelectric actuator 49 has a plurality of piezoelectric elements 67 corresponding to a plurality of pressure chambers 51.

First, the configuration of the piezoelectric element 67 will be described. On the upper surface of the vibrating film 57 of the upper substrate 46, a plurality of individual electrodes 60 are arranged so as to face each of the plurality of pressure chambers 51. That is, a plurality of first individual electrodes 60a are arranged in the transport direction corresponding to the plurality of first pressure chambers 51a, respectively, and the plurality of second individual electrodes 60b correspond to the plurality of second pressure chambers 51b, respectively. They are arranged in the transport direction. Each individual electrode 60 is made of platinum (Pt). Each individual electrode 60 has a rectangular planar shape smaller than that of the pressure chamber 51.

As shown in FIGS. 6 and 7, a piezoelectric film 61 made of a piezoelectric material such as PZT (lead zirconate titanate) is formed on the upper surface of the vibrating film 57. The piezoelectric film 61 is formed by, for example, the sol-gel method. The piezoelectric film 61 commonly covers both the plurality of first individual electrodes 60a on the right side and the plurality of second individual electrodes 60b on the left side. As shown in FIGS. 6 and 7 (b), a slit 64 extending along the scanning direction is formed in the portion between the two first individual electrodes 60a adjacent to each other in the transport direction on the right side portion of the piezoelectric film 61. Has been done. Further, as shown in FIGS. 6 and 7 (a), a slit 64 extending along the scanning direction is also provided in the portion of the left side portion of the piezoelectric film 61 between the two second individual electrodes 60b adjacent in the transport direction. Is formed. In other words, two slits 64 of the piezoelectric film 61 are arranged on both sides of each individual electrode 60 in the transport direction. Since the slit 64 is formed in the piezoelectric film 61 between the two individual electrodes 60 adjacent to each other in the transport direction, the portion of the piezoelectric film 61 facing each pressure chamber 51 is easily deformed.

The left end portion of the first individual electrode 60a extends further to the left from the left end portion of the first pressure chamber 51a, and is arranged at a position overlapping with the right end portion of the slit 64 of the piezoelectric film 61. In the slit 64, the left end portion of the first individual electrode 60a is exposed from the piezoelectric film 61 to form the first exposed portion 65. The left end portion of the second individual electrode 60b extends further to the left from the left end portion of the second pressure chamber 51b and is exposed from the left edge of the piezoelectric film 61 to form the second exposed portion 66.

The common electrode 62 is arranged so as to cover the piezoelectric film 61. The common electrode 62 is made of, for example, iridium (Ir). Further, the common electrode 62 faces the plurality of individual electrodes 60 (first individual electrode 60a, second individual electrode 60b) with the piezoelectric film 61 interposed therebetween. On the left side portion of the common electrode 62, a notch portion 68 cut out from the left side is formed between the portions facing the two second individual electrodes 60b adjacent to each other in the transport direction. As a result, the left side portion of the common electrode 62 is formed in a comb-teeth shape extending from the central portion of the common electrode 62 toward the left. In other words, the common electrode 62 is not arranged between the two second individual electrodes 60b adjacent to each other in the transport direction.

For one pressure chamber 51, one piezoelectric element 67 is configured by each portion of a common electrode 32, a piezoelectric film 61, and an individual electrode 60 facing the pressure chamber 51. Further, a plurality of piezoelectric elements 67 corresponding to the plurality of pressure chambers 51 are arranged in two rows according to the arrangement of the pressure chambers 51. In each piezoelectric element 67, the portion of the piezoelectric film 61 (hereinafter, also referred to as the active portion 61a) sandwiched between the individual electrode 60 and the common electrode 62 faces upward in the thickness direction, that is, from the lower individual electrode 60. It is polarized in the direction toward the upper common electrode 62.

An auxiliary conductor 63 arranged in contact with the common electrode 62 is provided on the common electrode 62. The auxiliary conductor 63 suppresses potential variation in the common electrode 62 by constructing another current path between different portions of the common electrode 62. The auxiliary conductor 63 is made of a metal material having a low electrical resistivity such as gold (Au) or aluminum (Al). Further, the thickness of the auxiliary conductor 63 is larger than the thickness of the common electrode 62. The auxiliary conductor 63 has a first conductive portion 63a, a plurality of second conductive portions 63b conducting on the first conductive portion 63a, and two third conductive portions 63c conducting on the first conductive portion 63a.

The first conductive portion 63a is arranged on the portion of the common electrode 62 on the right side of the plurality of first individual electrodes 60a. The first conductive portion 63a extends in the transport direction over the plurality of first individual electrodes 60a. Each second conductive portion 63b is arranged on the common electrode 62 between two first individual electrodes 60a adjacent to each other in the transport direction, and extends in the scanning direction. The two third conductive portions 63c are connected to the front end portion and the rear end portion of the first conductive portion 63a, respectively. These two third conductive portions 63c are arranged on the front side portion and the rear side portion of the common electrode 62 with respect to the plurality of individual electrodes 60, and extend to the left from the first conductive portion 63a, respectively.

As mentioned earlier, an electrical connection portion 70 is provided on the upper surface of the left end portion of the upper substrate 46. That is, the electrical connection portion 70 is arranged in a region on the upper surface of the upper substrate 46 that overlaps with the manifold 52b of the intermediate substrate 47. The electrical connection unit 70 has a plurality of first drive contacts 71a, a plurality of second drive contacts 71b, and two ground contacts 72.

A plurality of individual wirings 73 are connected to the individual electrodes 60 of the plurality of piezoelectric elements 67, respectively. Each individual wiring 73 is pulled out to the left from the individual electrode 60 and extends to the drive contact 71 of the electrical connection portion 70 provided at the left end portion of the upper substrate 46. As shown in FIG. 7, a part of the individual wiring 73 is arranged on the piezoelectric film 61. The plurality of individual wirings 73 are made of the same material as the auxiliary conductor 63 (for example, gold or aluminum).

As shown in FIGS. 6 and 7A, the first exposed portion 65 of the first individual electrode 60a on the right side is exposed from the piezoelectric film 61 in the slit 64 between the two second individual electrodes 60b. The right end portion of the first individual wiring 73a corresponding to the first individual electrode 60a is continuously formed from the first exposed portion 65 to the upper surface of the piezoelectric film 61. Further, the first individual wiring 73a passes from the first exposed portion 65 through between the two second individual electrodes 60b in the slit 64, and extends to the left along the upper surface of the vibration film 57 of the upper substrate 46. There is. Further, the first individual wiring 73a goes over the left end portion of the piezoelectric film 61 and is connected to the first drive contact 71a of the electrical connection portion 70. Since the common electrode 62 is formed in a notched shape in the region between the two second individual electrodes 60b so as to avoid the first individual wiring 73a, the first individual wiring is formed in the slit 64 of the piezoelectric film 61. The 73a and the common electrode 62 are not short-circuited.

As shown in FIGS. 6 and 7 (b), the second exposed portion 66 of the second individual electrode 60b on the left side is exposed from the left edge of the piezoelectric film 61. The right end portion of the second individual wiring 73b corresponding to the second individual electrode 60b is continuously formed from the second exposed portion 66 to the upper surface of the piezoelectric film 61. The second individual wiring 73b extends from the second exposed portion 66 to the left along the upper surface of the vibrating film 57 of the upper substrate 46, and is connected to the second drive contact 71b of the electrical connection portion 70.

The two third conductive portions 63c of the auxiliary conductor 63 described above extend to the left from the first conductive portion 63a and are connected to the ground contact 72 of the electrical connection portion 70.

As described above, in the present embodiment, in the upper substrate 46, one side (left side) in the scanning direction with respect to the piezoelectric element 67 corresponding to the first pressure chamber 51a and the piezoelectric element 67 corresponding to the second pressure chamber 51b. ), An electrical connection portion 70 having a drive contact 71 connected to the individual wiring 73 is arranged. Therefore, the first pressure chamber 51a and the second pressure chamber 51b are arranged on the opposite side (right side) of the drive contact 71 with respect to the center line C of the discharge head 20. Further, the nozzle row 31a corresponding to the first pressure chamber 51a and the nozzle row 31b corresponding to the second pressure chamber 51b are also arranged on the opposite side to the drive contact 71.

As shown in FIGS. 5 to 7, the piezoelectric actuator 49 is covered with a protective member 42 arranged on the upper surface of the upper substrate 46. The protective member 42 has a concave cover portion 42a and an opening portion 42b formed on the left side portion of the cover portion 42a. As shown in FIG. 5, the opening 42b of the protective member 42 communicates vertically with the opening 40a of the holder member 40 located above the opening 42b. When the protective member 42 is arranged on the upper surface of the upper substrate 46, the cover portion 42a covers the piezoelectric film 61 of the piezoelectric actuator 49. On the other hand, the electrical connection portion 70 of the upper substrate 46 is exposed from the opening portion 42b of the protective member 42.

The COF 35 is connected to the electrical connection portion 70 of the upper substrate 46. As shown in FIG. 5, the COF 35 extends toward the upper circuit board 34 while meandering in an S shape in the opening 42b of the protective member 42 and the opening 40a of the holder member 40. The circuit board 34 is formed with a through hole 34b located above the opening 40a of the holder member 40 and through which the COF 35 passes. Further, a connection terminal 75 is provided on the upper surface of the circuit board 34 on the right side of the through hole 34b. The COF 35 extending upward from the contact of the electrical connection portion 70 passes through the through hole 34b of the circuit board 34 located on the right side of the contact and is connected to the connection terminal 75.

Around the connection terminal 75 of the circuit board 34 with the COF 35, various circuit elements 77 for supplying signals to the COF 35 and many wirings 78 for connecting these circuit elements 77 and the connection terminal 75 are used. Etc. are placed. Here, in the present embodiment, the connection terminal 75 of the circuit board 34 is arranged on the piezoelectric element 67 side (right side) in the scanning direction with respect to the drive contact 71 of the upper substrate 46. Therefore, the circuit element 77, the wiring 78, and the like connected to the connection terminal 75 can be arranged in the region overlapping with the piezoelectric element 67 of the circuit board 34, so that the size of the circuit board 34 can be reduced. Further, a through hole 34a through which the flow path member 41 penetrates is formed on the side (left side) of the circuit board 34 opposite to the piezoelectric element 67 from the drive contact 71 of the upper substrate 46. Therefore, in the region on the left side of the drive contact 71 of the circuit board 34, there is not much region for installing the connection terminal 75, the circuit element 77 connected to the connection terminal 75, and the like. From this viewpoint as well, it is preferable that the connection terminal 75 is arranged closer to the piezoelectric element 67 than the drive contact 71.

As shown in FIG. 5, a driver IC76 is provided in the middle of the COF35 in the vertical direction. The driver IC 76 is electrically connected to the circuit board 34 via wiring on the COF 35. Further, the driver IC 76 is also electrically connected to the drive contact 71 of the electrical connection unit 70 via the wiring on the COF 35. Then, the driver IC 76 outputs a drive signal to the individual electrode 60 based on the control signal sent from the circuit board 34, and switches the potential of the individual electrode 60 between the ground potential and the predetermined drive potential. The ground contact 72 of the electrical connection portion 70 is electrically connected to the ground of the COF 35 (not shown), and the common electrode 62 is held at the ground potential.

The operation of the piezoelectric element 67 when a drive signal is supplied from the driver IC 76 will be described. In the state where the drive signal is not supplied, the potential of the individual electrode 60 is the ground potential, which is the same potential as the common electrode 62. From this state, when a drive signal is supplied to a certain individual electrode 60 and a drive potential is applied to the individual electrode 60, the potential difference between the individual electrode 60 and the common electrode 62 causes the active portion 61a of the piezoelectric element 67 to receive a drive signal. An electric field parallel to the thickness direction acts. Here, in order for the polarization direction of the active portion 61a to coincide with the direction of the electric field, the active portion 61a extends in the thickness direction, which is the polarization direction, and contracts in the plane direction. With the contraction deformation of the active portion 61a, the vibrating membrane 57 bends so as to be convex toward the pressure chamber 51. As a result, the volume of the pressure chamber 51 is reduced and a pressure wave is generated in the pressure chamber 51, so that ink droplets are ejected from the nozzle 30 communicating with the pressure chamber 51.

In the present embodiment described above, the substrate (upper substrate 46) in which the first pressure chamber 51 and the second pressure chamber 51 are formed and the manifold 52 communicating with these pressure chambers 51 are formed in each discharge head 20. The substrate (intermediate substrate 47) is separate from the original substrate. Therefore, the width of the upper substrate 46 in the scanning direction can be reduced by the amount that the manifold 52 is not formed. Further, the individual wiring 73 drawn from the piezoelectric element 67 corresponding to the first pressure chamber 51 and the individual wiring 73 drawn from the piezoelectric element 67 corresponding to the second pressure chamber 51 are both connected to the piezoelectric element 67. It is pulled out toward the drive contact 71 of the electrical connection unit 70, which is arranged on one side (left side) in the scanning direction. That is, the drive contact 71 connected to the COF 35 is not arranged between the first pressure chamber 51 and the second pressure chamber 51. Therefore, the first pressure chamber 51 and the second pressure chamber 51 can be brought close to each other to narrow the distance between the two nozzle rows 31 in the scanning direction. Further, the lower substrate 48 can be prevented from overlapping with the electrical connection portion 70 of the upper substrate 46. As a result, the width of the lower substrate 48 in the scanning direction can be reduced.

Further, in the present embodiment, as shown in FIG. 2, a plurality of upper substrates 46 of each discharge head 20 are located on one side (left side) in the scanning direction with respect to the first pressure chamber 51 and the second pressure chamber 51. An electrical connection 70 having a contact 71 is arranged. With this configuration, the first nozzle row 31a corresponding to the first pressure chamber 51 and the second nozzle row 31b corresponding to the second pressure chamber 51 are offset to the opposite side (right side) of the electrical connection portion 70 in the scanning direction. Are arranged.

Further, in the two ejection heads 203 and 204 located on the outer side of the inkjet head 4, the two nozzle rows 31 are arranged on the outer side. As a result, the distance of the nozzle row 31 can be separated between the two outer discharge heads 20.

Further, in the present embodiment, as shown in FIG. 2, in the two ejection heads 201 and 202 arranged inside among the four ejection heads 20 of the inkjet head 4, the two nozzle rows 31 are offset inward. In the two ejection heads 203 and 204 arranged on the outside, the two nozzle rows 31 are arranged on the outer side. As a result, the distance between the nozzle row 31 of the inner ejection head 201 (202) that ejects black and magenta ink and the nozzle row 31 of the outer ejection head 203 (204) that ejects cyan and yellow ink. Can be released.

If the nozzle row 31 of the inner discharge head 20 and the nozzle row 31 of the outer discharge head 20 are separated from each other, the problem that the two types of ink are mixed and adhere to each nozzle 30 is unlikely to occur. For example, as shown in FIG. 3, when suction purging is performed by covering the nozzle rows 31 of the four ejection heads 20 with the cap 21, the black ejected from the inner nozzle 30 is ejected to the nozzle 30 of the outer ejection head 20. And magenta ink is hard to adhere. Further, when recording an image or the like on the recording paper 100, it is unlikely that the black or magenta ink ejected from the inner nozzle 30 becomes mist and adheres to the nozzle 30 of the outer ejection head 20.

Further, when the black ink is mixed in the nozzle 30y that ejects the yellow ink, the influence on the print quality is very large. Therefore, it is preferable to eject one of the black ink and the yellow ink from the inner ejection head 201 (202) and the other from the outer ejection head 203 (204). In the present embodiment, the inner ejection head 201 (202) ejects black ink, and the outer ejection head 203 (204) ejects yellow ink.

In the embodiment described above, the inkjet printer 1 corresponds to the "liquid ejection device" of the present invention. One ejection head 20 of the inkjet head 4 corresponds to the "liquid ejection head" of the present invention. The front-back direction (transportation direction) corresponds to the "first direction" of the present invention, and the left-right direction (scanning direction) corresponds to the "second direction" of the present invention. Of the four ejection heads 20 of the inkjet head, the two ejection heads 20 located inside correspond to the "inner liquid ejection head" of the present invention, and the two outer ejection heads 20 correspond to the "outer liquid ejection head" of the present invention. Corresponds to the "discharge head". The black and magenta inks ejected from the inner ejection head 20 correspond to the "first liquid" of the present invention, and the cyan and yellow inks ejected from the outer ejection head 20 correspond to the "second liquid" of the present invention. Corresponds to "liquid".

Next, a modified embodiment in which various modifications are made to the embodiment will be described. However, those having the same configuration as that of the above-described embodiment are designated by the same reference numerals and the description thereof will be omitted as appropriate.

1] As shown in FIG. 8, of the four ejection heads 20 of the inkjet head 4, the nozzle rows 31 of the two ejection heads 20 located on the outside may be arranged one-sidedly inward in the scanning direction. That is, in the discharge head 203 located at the left end, the two nozzle rows 31 are offset to the right side, and in the discharge head 204 located at the right end, the two nozzle rows 31 are offset to the left side. As a result, the distance D of the nozzle row 31 can be made close between the two discharge heads 203 and 204 located on the outer side. In this configuration, the distance D in the scanning direction between the nozzle row 31 located at the left end and the nozzle row 31 located at the right end of the inkjet head 4 becomes small, so that the following effects can be obtained.

(1) When printing is performed on the recording paper 100 while the inkjet head 4 reciprocates in the scanning direction, the smaller the distance D between the nozzle row 31 located at the left end and the nozzle row 31 located at the right end. The travel distance in one pass can be shortened. As a result, the time required for one pass is shortened, and the time required for printing on one sheet of recording paper 100 is also shortened.

(2) Ideally, each ejection head 20 of the inkjet head 4 is mounted so that the arrangement direction of the nozzles 30 (extending direction of the nozzle row 31) is completely parallel to the transport direction. In many cases, the nozzles 30 are attached in a state where the arrangement direction is slightly tilted with respect to the transport direction. In that case, due to the above inclination, the landing position of the ink droplets ejected from the nozzle 30 shifts in the transport direction between the two nozzle rows 31. Here, the landing position deviation between the two nozzle rows 31 depends on the distance between the two nozzle rows 31 in the scanning direction. That is, in the present embodiment, the ink between the two nozzle rows 31 is formed by reducing the distance D in the scanning direction between the nozzle row 31 located at the left end and the nozzle row 31 located at the right end. It is possible to reduce the landing position deviation of.

2] In the above embodiment, the nozzle rows 31 for ejecting the four colors of ink are arranged symmetrically, but the arrangement is not limited to this. For example, as shown in FIG. 9, in both the ejection head 201 and the ejection head 202 located inside, the magenta ink nozzle row 31m may be arranged on the left side, and the black ink nozzle row 31k may be arranged on the right side. .. That is, in the two ejection heads 201 and 202, the magenta nozzle rows 31m1, 31m2 and the black nozzle rows 31k1, 31k2 may be arranged alternately in the scanning direction. The same applies to the discharge head 203 and the discharge head 204 located on the outside. For example, as shown in FIG. 9, the yellow nozzle row 31y is arranged on the left side and the cyan nozzle row 31c is arranged on the right side. You may.

3] The number of ejection heads 20 of the inkjet head 4 is not limited to four, and the number of ejection heads 20 may be two or three, or the number of ejection heads 20 may be five or more. For example, when ejecting inks of different colors such as light magenta and light cyan in addition to black, magenta, cyan, and yellow, two of the four ejection heads 201 to 204 are charged with light magenta and light cyan on both sides in the scanning direction. Two ejection heads 20 for ejecting colored ink may be arranged respectively. Further, a discharge head 20 that discharges another ink (for example, white ink) may be arranged between the inner discharge head 201 and the discharge head 202.

4] In the above embodiment, the two nozzle rows 31 of each ejection head 20 eject different types of ink, but the two nozzle rows 31 of one ejection head 20 eject the same type of ink. It may be configured to do so. Further, a plurality of ejection heads 20 may be configured to eject the same type of ink.

5] The inkjet head 4 of the above embodiment is a so-called serial type inkjet head that ejects ink to recording paper while moving in the scanning direction, but it is a line that is fixedly installed and used at a predetermined position. The present invention can also be applied to a type of inkjet head.

The inkjet printer 81 of FIG. 10 includes a line-type inkjet head 84 and a transfer mechanism 86 including two transfer rollers 87 and 88. The inkjet head 84 has four ejection heads 90 attached to the head holder 83. The ejection head 90 has a plurality of nozzles 92 arranged in the left-right direction (paper width direction), and the plurality of nozzles 92 form two nozzle rows 91 arranged in the front-rear direction (conveyance direction).

In the inkjet head 84, the four ejection heads 90 are combined to form a nozzle row longer in the paper width direction than the nozzle row 91 of one ejection head 90. If the four ejection heads 90 are simply connected in the paper width direction, a portion where the nozzle 92 is not arranged in the paper width direction is generated between the ejection heads 90. Therefore, the four discharge heads 90 are arranged separately in the front and rear, and the two discharge heads 90a on the front side and the two discharge heads 90b on the rear side are arranged so as to be offset from each other to the left and right. The four ejection heads 90 of the inkjet head 84 eject ink from the nozzle 92 to the recording paper 100 which is conveyed forward by the two conveying rollers 87 and 88 of the conveying mechanism 86.

Further, the two nozzle rows 91 of each discharge head 90 are arranged to be offset inward in the front-rear direction. That is, in the two discharge heads 90a located on the front side, the nozzle row 91 is arranged on the rear side, and in the two discharge heads 90b located on the rear side, the nozzle row 91 is arranged on the front side. Therefore, the distance between the nozzle rows 91 can be reduced between the discharge heads 90 arranged in the front-rear direction. As a result, even when the inkjet head 84 is mounted so that the nozzle arrangement direction is slightly tilted with respect to the left-right direction, the distance between the front and rear ejection heads 90 is small, so that the nozzle row 91 is small. The deviation of the ink landing position between the rows 91 can be suppressed to a small extent. In addition, in the form of FIG. 10, the recording paper 100 corresponds to the "ejection medium" of the present invention. The paper width direction (left-right direction) corresponds to the "first direction" of the present invention, and the front-back direction (conveyance direction) corresponds to the "second direction" of the present invention.

The embodiment described above and the modified embodiment thereof apply the present invention to an inkjet head that ejects ink onto recording paper to print an image or the like, but are used for various purposes other than printing an image or the like. The present invention can also be applied to a liquid discharge device. For example, the present invention can be applied to a liquid discharge device that discharges a conductive liquid onto a substrate to form a conductive pattern on the surface of the substrate.

1 Inkjet printer 4 Inkjet head 20 Discharge head 30 Nozzle 31c Nozzle row 31 Nozzle row 34 Circuit board 46 Upper board 47 Intermediate board 48 Lower board 51 Pressure chamber 52 Manifold 67 Piezoelectric element 73 Individual wiring 75 Connection terminal 81 Inkjet printer 84 Inkjet head 86 Conveyance mechanism 90 Discharge head 91 Nozzle row 92 Nozzle 100 Recording paper

Claims (33)

A plurality of first nozzles arranged along the first direction are formed, and a flat first nozzle forming member and a first flow path communicating with the plurality of first nozzles are formed to form a pressure chamber. A first liquid discharge head having a first flow path forming member in which a pressure generating element for pressurization is formed is provided.
The first flow path forming member has a first contact connected to the wiring formed in the wiring member.
The first nozzle forming member has a first end and a second end which are both ends in a second direction orthogonal to the first direction.
The first flow path forming member has a third end and a fourth end which are both ends in the second direction.
The first nozzle forming member is laminated on the first flow path forming member in a third direction orthogonal to the first direction and the second direction.
The first contact, the first end, the second end, and the third end are in the order of the third end, the first contact, the first end, and the second end in the second direction. Arranged and
A liquid discharge device characterized in that a contact point connected to a wiring formed in the wiring member is not formed in the vicinity of the fourth end of the first flow path forming member. The first aspect of claim 1, wherein the distance from the second end to the fourth end in the second direction is smaller than the distance from the first end to the third end in the second direction. Liquid discharge device. A second nozzle forming member in which a plurality of second nozzles arranged along the first direction are formed, and a second flow path forming member in which a second flow path communicating with the plurality of second nozzles is formed. A second liquid discharge head with,
The second flow path forming member has a second contact connected to a wiring formed in a wiring member different from the wiring member.
The second nozzle forming member has a fifth end and a sixth end, which are both ends in the second direction.
The second flow path forming member has a seventh end and an eighth end which are both ends in the second direction.
The second nozzle forming member is laminated on the second flow path forming member in the third direction.
The second contact, the fifth end, the sixth end, and the eighth end are in the order of the fifth end, the sixth end, the second contact, and the eighth end in the second direction. Arranged and
The liquid discharge device according to claim 1, wherein a contact point connected to a wiring formed in the other wiring member is not formed in the vicinity of the seventh end of the second flow path forming member. The first contact, the second contact, the third end, and the eighth end are in the order of the third end, the first contact, the second contact, and the eighth end in the second direction. The liquid discharge device according to claim 3, wherein the liquid discharge device is arranged. 3. The third or claim is characterized in that the distance from the second end to the fourth end in the second direction is smaller than the distance from the third end to the first end in the second direction. 4. The liquid discharge device according to 4. A third aspect of the present invention, wherein the distance from the fifth end to the seventh end in the second direction is smaller than the distance from the sixth end to the eighth end in the second direction. 5. The liquid discharge device according to any one of 5. The liquid according to any one of claims 3 to 6, wherein at least a part of the first liquid discharge head is arranged at a position deviated from the second liquid discharge head in the second direction. Discharge device. Equipped with a third liquid discharge head,
The liquid discharge device according to any one of claims 3 to 7, wherein the third liquid discharge head is aligned with the first liquid discharge head in the first direction. Equipped with a fourth liquid discharge head,
The liquid discharge device according to claim 8, wherein the fourth liquid discharge head is aligned with the second liquid discharge head in the first direction. The liquid discharge device according to claim 3, wherein the second liquid discharge head is aligned with the first liquid discharge head in the second direction. Equipped with a third liquid discharge head,
The liquid discharge device according to claim 10, wherein the third liquid discharge head is aligned with the first liquid discharge head in the second direction. Equipped with a fourth liquid discharge head,
The liquid discharge device according to claim 11, wherein the fourth liquid discharge head is aligned with the first liquid discharge head in the second direction. 12. The first liquid discharge head and the second liquid discharge head are arranged between the third liquid discharge head and the fourth liquid discharge head in the second direction. The liquid discharge device according to. A second nozzle forming member in which a plurality of second nozzles arranged along the first direction are formed, and a second flow path forming member in which a second flow path communicating with the plurality of second nozzles is formed. A second liquid discharge head with,
The second flow path forming member has a second contact connected to a wiring formed in a wiring member different from the wiring member.
The second nozzle forming member has a fifth end and a sixth end, which are both ends in the second direction.
The second flow path forming member has a seventh end and an eighth end which are both ends in the second direction.
The second nozzle forming member is laminated on the second flow path forming member in the third direction.
The second contact, the fifth end, the sixth end, and the seventh end are in the order of the seventh end, the second contact, the fifth end, and the sixth end in the second direction. Arranged,
The liquid discharge device according to claim 1, wherein a contact connected to a wiring formed in the other wiring member is not formed in the vicinity of the second contact of the second flow path forming member. .. The liquid discharge device according to claim 14, wherein the second liquid discharge head is aligned with the first liquid discharge head in the first direction. The liquid discharge device according to any one of claims 1 to 15, wherein the first flow path forming member is a laminated body composed of a plurality of substrates laminated in the third direction. In the first nozzle forming member, a plurality of second nozzles arranged along the first direction are formed.
The liquid ejection device according to claim 1, wherein the plurality of second nozzles are formed at positions displaced from the plurality of first nozzles in the second direction. The liquid discharge device according to claim 17, wherein the plurality of first nozzles and the plurality of second nozzles discharge liquids of the same color. A liquid discharge head having a nozzle forming member in which a plurality of first nozzles arranged along a first direction are formed and a flow path forming member in which a flow path communicating with the plurality of first nozzles is formed. Prepare,
The flow path forming member has a contact point connected to the wiring formed in the wiring member.
The nozzle forming member has a first end and a second end which are both ends in a second direction orthogonal to the first direction.
The flow path forming member has a third end and a fourth end which are both ends in the second direction.
The nozzle forming member is laminated on the flow path forming member in a third direction orthogonal to the first direction and the second direction.
The contact, the first end, the second end, and the third end are arranged in the order of the third end, the contact, the first end, and the second end in the second direction. ,
A liquid discharge device characterized in that a contact point connected to a wiring formed in the wiring member is not formed in the vicinity of the fourth end of the flow path forming member. 19. The 19th aspect of claim 19, wherein the distance from the second end to the fourth end in the second direction is smaller than the distance from the first end to the third end in the second direction. Liquid discharge device. The liquid discharge device according to claim 19, wherein the flow path forming member is a laminated body composed of a plurality of substrates laminated in the third direction. A plurality of second nozzles arranged along the first direction are formed in the nozzle forming member.
The liquid ejection device according to any one of claims 19 to 21, wherein the plurality of second nozzles are formed at positions displaced from the plurality of first nozzles in the second direction. 22. The liquid ejection device according to claim 22, wherein the plurality of first nozzles and the plurality of second nozzles eject liquids of the same color. The liquid discharge device according to claim 1, wherein the pressure generating element and the first nozzle face each other in a third direction. The liquid according to claim 1, wherein the length of the first contact point in the first direction is at least half the length of the third end of the first flow path forming member in the first direction. Discharge device. The liquid discharge device according to claim 1, wherein the first contact is arranged symmetrically with respect to the center of the first flow path forming member in the first direction. The liquid discharge device according to claim 1, wherein the first flow path forming member has a manifold communicating with the pressure chamber. 27. The liquid discharge device according to claim 27, which comprises a film covering the manifold. 28. The liquid ejection device according to claim 28, wherein the film is made of a synthetic resin. The liquid discharge device according to claim 28 or 29, wherein the film and the first contact point are arranged at positions sandwiching the first flow path forming member. The liquid ejection device according to any one of claims 28 to 30, further comprising a plate covering the film. 31. The liquid ejection device according to claim 31, wherein the film is thinner than the plate . The liquid discharge device according to claim 1, wherein the pressure generating element is a piezoelectric element.

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