JP2005096149A - Manifold of inkjet head, inkjet head, and manufacturing method therefor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a manifold of an inkjet head, which can obtain high adhesive strength and can surely prevent leakage of ink, the inkjet head having the manifold, and a manufacturing method for the inkjet head. <P>SOLUTION: The manifolds 20a and 20b of the inkjet head are bonded to an actuator 10 wherein the channels 12a and 12b for generating a change in pressure to be imparted to the ink are provided in parallel, so as to form common ink chambers 21a and 21b for distributing the ink to respective channels 12a and 12b. The manifolds 20a and 20b are characterized in that: a groove is provided in a recessed state in a surface, brought into contact with the actuator 10, in such a manner as to perfectly surround the common ink chambers 21a and 21b formed between the manifolds and the actuator 10; and through-holes 24a and 24b for injection of an adhesive are formed in such a manner as to penetrate from the inside of the groove to a surface except the surface brought into contact with the actuator 10. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  In an inkjet head that records a desired image by ejecting ink onto a recording medium, the present invention distributes ink to each channel by bonding a channel that generates a pressure change applied to the ink to a parallel actuator. The present invention relates to a manifold for an inkjet head that forms a common ink chamber, an inkjet head having the manifold, and a method for manufacturing the inkjet head.

  In an inkjet head in which a plurality of channels are arranged in parallel, a pressure change is generated by the action of a piezoelectric element or a heating element in each channel, and a manifold is provided in an actuator that discharges ink from a nozzle provided for each channel. A common ink chamber is formed to distribute the ink.

  The manifold is directly bonded to the piezoelectric ceramic actuator body, the purpose of which is to firmly attach the manifold to the actuator body and to prevent ink leakage from the joint between the manifold and the actuator.

  In normal bonding, the surfaces of two objects to be bonded are polished and washed, and an adhesive is applied to one or both bonding surfaces, and then the bonding surfaces are bonded to each other for bonding.

  In order to firmly attach the manifold to the actuator and prevent ink leakage, apply adhesive on the entire adhesive surface, remove bubbles mixed in under reduced pressure, etc., and then accurately align the objects to be bonded, After temporarily fixing, pressure bonding is performed, and further, heat curing is performed.

  For this reason, when bonding the manifold and the actuator, it is necessary to apply a high pressure to the bonding surface to spread the adhesive so that ink leakage does not occur, so the adhesive protruding from the bonding surface blocks the channel. There is danger. In addition, excessive adhesive may flow out into the manifold, narrowing the ink flow path, or flowing into the nozzle, causing the nozzle to be blocked. In particular, the epoxy adhesive, when heated at the time of curing, rapidly decreases in viscosity and easily flows out from the adhesive surface. Therefore, when pressurized at room temperature, the epoxy adhesive always flows out when heated even if it does not flow out. When the amount of the adhesive used is large, it tends to flow out into the ink flow path at the time of curing, and when the amount used is small, it is difficult to flow out, but it is easy to cause peeling of the adherend or ink leakage due to poor adhesion.

  The inkjet ink contains a large amount of an organic solvent and a surfactant and easily dissolves the adhesive. Therefore, if the amount of the adhesive used is small, the adhesive strength tends to decrease. Furthermore, a part of the adhesive that has flowed out and solidified into the ink flow path is dissolved to form a fine lump, which may clog the ink flow path. In addition, it is extremely difficult to perform precise positioning and bonding after applying an adhesive.

  In order to avoid such a trouble, a method is used in which a groove is formed on one or both of the bonding surfaces of the adherend, and the groove is filled with an adhesive and bonded. In this method, since the adhesive is injected into the groove after the objects to be bonded are overlapped in the absence of the adhesive, precise alignment is possible. Further, if the adhesive can uniformly enter the groove, ink leakage can be completely prevented. Further, since the adhesive is only subjected to the pressure of the dispenser and is not applied with a strong pressure, the adhesive can be prevented from protruding into the ink flow path. Thus, the method of forming a groove | channel on an adhesive surface and aligning a to-be-adhered object, and filling a groove | channel with an adhesive agent is well-known, for example, it describes in patent documents 1-4.

  Patent Document 5 describes that a groove is formed on a surface to be bonded, the groove is filled with an adhesive, and an object to be bonded is stacked, and Patent Documents 6 and 7 describe an object to be bonded. It is described that a groove is formed in the surface and the adhesive is filled therein by capillary force.

Further, in Patent Document 8, an adhesive injection groove that communicates from a contact surface between the manifold and the actuator to a surface other than the contact surface of the manifold is provided, and after this manifold is aligned with the actuator, the adhesive injection groove extends to the manifold. Insert the adhesive injection needle toward the contact surface between the actuator and the actuator, and inject the adhesive while moving along the groove, so that the adhesive application site is regulated in the adhesive injection groove The proposed technology has been proposed.
JP 7-156404 A JP-A-8-58078 JP-A-8-58097 JP-A-8-300656 Japanese Patent Laid-Open No. 11-138814 JP-A-6-190307 JP-A-6-226977 JP 2001-315342 A

  In Patent Documents 1 to 5, the adhesive filling the grooves is a silicon-based filler. Silicone fillers have sufficiently high ink resistance, but the mechanical strength of the bonded part is weak, and the inkjet head bonded by silicon filling will peel off when mounted on a carriage and repeated rapid acceleration / deceleration. End up. Silicone fillers are extremely effective in preventing ink leakage and ink mixing due to ink leakage, but due to their low adhesive strength, use is stopped around the ink flow path, and other parts are epoxy adhesives. If it is not reinforced using, there is a drawback that the adhesive strength cannot be maintained.

  Patent Documents 6 and 7 are examples in which a groove is provided in a nozzle plate and bonded to an actuator. However, since the adhesive is infiltrated by capillary force, there is a drawback that only an adhesive having a low viscosity can be used. An adhesive having a low viscosity has a low molecular weight, and a high adhesive strength cannot be obtained.

  According to the technique described in Patent Document 8, the adhesive application site is restricted within the adhesive injection groove, so that the adhesive can be prevented from protruding from the adhesive surface to the common ink chamber. The adhesive injected into the adhesive injection groove is allowed to flow down naturally to the adhesive surface by gravity, and for the adhesive whose viscosity changes transiently as it hardens, the adhesive is injected into the adhesive injection groove. It is difficult to control the amount.

  Further, in the technique described in Patent Document 8, since there is only a groove for injecting the adhesive and there is no other part for the adhesive to escape, the adhesive is increased when the amount of injected adhesive is increased. Is difficult to control the amount of adhesive injected because it only protrudes outside or penetrates inside by capillary force.

  Further, in Patent Document 8, an injection mark line is provided at a predetermined height position in the adhesive injection groove, and when the injection operator visually confirms that the adhesive has reached the injection mark line, an adhesive injection needle is provided. It is described that a predetermined amount of injection is performed by releasing the injection and stopping the injection operation, but since it is necessary to perform a confirmation operation for each adhesive injection groove, the adhesive injection operation is In addition to the complicated problem, there is also a problem that the adhesive is consumed more than necessary because it is necessary to inject the adhesive to such an extent that it can be visually confirmed.

  Accordingly, an object of the present invention is to provide an ink jet head manifold capable of obtaining high adhesive strength and reliably preventing ink leakage, an ink jet head having the same, and a method of manufacturing the ink jet head. .

  Other problems of the present invention will become apparent from the following description.

  The above problems are solved by the following inventions.

  According to a first aspect of the present invention, in a manifold of an ink jet head that forms a common ink chamber for adhering a channel for generating a pressure change applied to ink to a parallel actuator to distribute ink to each channel, contact with the actuator is made. A groove is formed in the surface so as to completely surround the common ink chamber formed with the actuator, and an adhesive is injected from the inside of the groove to a surface other than the contact surface with the actuator. And a through-hole for the inkjet head.

  The invention according to claim 2 is the manifold of the ink jet head according to claim 1, wherein there are a plurality of the grooves, and the through hole is connected to at least one groove.

  According to a third aspect of the present invention, there is provided an actuator in which channels for generating a pressure change applied to the ink are arranged in parallel, and a manifold that forms a common ink chamber that adheres to the actuator and distributes the ink to each channel. In the inkjet head that discharges ink from the nozzle corresponding to each channel by generating a pressure change in the manifold, the manifold is completely provided with a common ink chamber formed between the actuator and a contact surface with the actuator. An ink jet head characterized in that a groove is recessed so as to surround, and a through hole for injecting adhesive is formed to penetrate from the inside of the groove to a surface other than the contact surface with the actuator. It is.

  A fourth aspect of the invention is the ink jet head according to the third aspect, wherein there are a plurality of the grooves, and the through hole is connected to at least one groove.

  The invention according to claim 5 is the ink jet head according to claim 3 or 4, wherein the actuator and the manifold are bonded by an adhesive injected into the groove from the through hole.

  According to a sixth aspect of the present invention, a part of the groove is opposed to a voltage application electrode part for generating a pressure change in each channel of the actuator with a gap from the through hole. 6. The ink jet head according to claim 3, wherein a part of the adhesive is injected to fill a space between the electrode part and the part of the electrode part is insulated. is there.

  The invention according to claim 7 is provided with an actuator in which channels for generating a pressure change applied to ink are arranged in parallel, and a manifold that forms a common ink chamber that adheres to the actuator and distributes ink to each channel. In the method of manufacturing an ink-jet head that generates a pressure change and ejects ink from nozzles corresponding to each channel, a common ink chamber formed between the actuator and the actuator is completely formed on a contact surface of the manifold with the actuator. A groove is formed so as to surround the groove, and a through hole for injecting adhesive is formed to penetrate from the inside of the groove to a surface other than the contact surface with the actuator, and the manifold is positioned in contact with the actuator. After that, the adhesive is injected into the through hole to fill the groove with the adhesive, A method of manufacturing an ink jet head, characterized by bonding the actuator and with said manifold.

  The invention according to claim 8 is the method of manufacturing an ink-jet head according to claim 7, wherein there are a plurality of the grooves, and the through hole is connected to at least one groove.

  According to a ninth aspect of the present invention, a part of the groove is opposed to a voltage applying electrode part for generating a pressure change in each channel of the actuator with a space between the through hole and the groove. 9. The method of manufacturing an ink jet head according to claim 7, wherein a part of the adhesive injected into the electrode fills a gap with the electrode part to insulate part of the electrode part.

  According to the present invention, a groove that completely surrounds the common ink chamber is provided, a through hole connected to the groove is formed, the manifold and the actuator are overlapped and aligned, and the adhesive is injected from the hole with a dispenser. By doing so, the risk of blocking the channel with an adhesive can be eliminated, and the manifold can be firmly adhered to the actuator to prevent ink leakage.

  In addition, when the manifold is bonded to the actuator, the risk of clogging the channel with an adhesive can be eliminated, and the allowable range of the adhesive injection amount is wide, and the adhesive can be easily performed by injecting the minimum amount of adhesive. .

  Furthermore, since the injection of the adhesive can be performed from one direction with respect to the through hole, it is advantageous in automation.

  Further, by providing a plurality of grooves, the adhesive strength is high, and the effect of preventing ink leakage can be further enhanced. Even if the adhesive is not completely filled in some of the plurality of grooves, the adhesive strength is high and ink leakage is unlikely to occur.

  FIG. 1 is a cross-sectional view showing an embodiment of an ink jet head according to the present invention, FIG. 2 is an exploded perspective view thereof, FIG. 3 is a partial cross-sectional view taken along line (iii)-(iii) in FIG. A bottom view of the manifold, FIG. 5 is a diagram for explaining the bonding operation of the manifold.

  1 and 2, the actuator 10 is mainly composed of a piezoelectric ceramic in which a large number of channels 12a and 12b having printing nozzles 11a and 11b are arranged in parallel, and a first manifold is provided on the upper and lower surfaces of the actuator 10, respectively. 20a and the second manifold 20b are bonded.

  The actuator 10 is a ceramic member in which a piezoelectric ceramic layer having opposite polarization directions is provided on a long non-piezoelectric ceramic substrate, and is a member that generates a pressure change applied to ink.

  The actuator 10 is formed with a plurality of channels 12a and 12b cut by a diamond blade or the like. Here, a ceramic member is configured by providing piezoelectric ceramic layers having opposite polarization directions on both surfaces of a non-piezoelectric ceramic substrate, and cutting is performed on both surfaces of the ceramic member, whereby upper and lower two rows of channels 12a, A mode is shown in which a large number of 12b are formed in parallel to increase the density. Each of the channels 12a and 12b is cut into a straight and elongated groove shape, and the uncut piezoelectric ceramic has a partition wall 13a between adjacent channels 12a and 12a and a partition wall 13b between channels 12b and 12b. (See FIG. 3). The depth of each channel 12a, 12b gradually decreases as it goes to the right in FIG. 1, and finally disappears. Metal electrodes (not shown) are formed on part of the inner surfaces of the channels 12a and 12b.

  Also, cover substrates 14a and 14b made of a non-piezoelectric ceramic substrate or the like are bonded from above the channels 12a and 12b, respectively, and block most of the channels 12a and 12b.

  The non-piezoelectric ceramic substrate is preferably selected from at least one of alumina, aluminum nitride, zirconia, silicon, silicon nitride, silicon carbide, and quartz, and a piezoelectric ceramic that is polarized even if the partition walls 13a and 13b are shear-deformed. It can be reliably supported.

  As a piezoelectric ceramic, a ceramic such as PZT, PLZT, etc., mainly a mixed microcrystal of PbOx, ZrOx, TiOx, a trace amount of metal oxide known as a softening agent or a hardening agent, such as Nb, Zn, Mg, Those containing oxides such as Sn, Ni, La, and Cr are preferable.

  PZT is lead zirconate titanate, which is preferable because it has a high packing density, a large piezoelectric constant, and good workability. When the temperature is lowered after firing, the crystal structure suddenly changes, and PZT becomes a collection of fine crystals in the form of dipoles in which atoms are displaced, one side is positive, and the other side is negative. These spontaneous polarizations are random in direction and cancel each other's polarity, so further polarization processing is required.

  In the polarization treatment, a PZT thin plate is sandwiched between electrodes, immersed in silicon oil, and polarized by applying a high electric field of about 10 to 35 kv / cm. When a voltage is applied to the polarized PZT at a right angle to the polarization direction, the side wall is sheared and deformed in a diagonal shape in a diagonal direction by the piezoelectric sliding effect, and the volume of the ink chamber expands.

  Gold, silver, aluminum, palladium, nickel, tantalum, and titanium can be used as the material of the metal electrode, and gold and aluminum are particularly preferable from the viewpoint of electrical characteristics and workability. It is formed. Each metal electrode is drawn from the inside of each channel 12a, 12b through the shallow groove portion to the upper surface and the lower surface on the rear (right end) side of the actuator 10, and voltage is applied to the metal electrode in each channel 12a, 12b, respectively. The connecting electrode portions 15a and 15b are electrode portions for the purpose.

  In FIG. 1, a nozzle plate 11 is bonded to the left end of the actuator 10. The nozzle plate 11 is provided with nozzles 11a and 11b corresponding to the positions of the respective channels 12a and 12b. Polyalkylene terephthalate such as PET, polyimide, polyetherimide, polyetherketone, polyethersulfone, polycarbonate, cellulose acetate Etc. are formed of plastics.

  FIG. 3 shows a part of the channels 12a and 12b. Each of the channels 12a and 12b is cut into a linear and elongated groove shape and includes partition walls 13a and 13b. When the partition walls 13a and 13b are subjected to shear deformation, pressure changes in the channels 12a and 12b are generated. The arrangement direction of the channels 12a and 12b is a direction translated in the direction perpendicular to the longitudinal direction in each of the upper and lower columns, and the channels 12a and 12b in each column are arranged at equal intervals.

  In FIG. 1, at the right end of the actuator 10, signal lines 30a and 30b made of FPC (flexible circuit board) or the like in which signal lines corresponding to the channels 12a and 12b are combined are respectively connected electrode portions 15a and 15b. Are bonded to each other by an epoxy-based adhesive or the like, and are electrically connected to the metal electrodes in the respective channels 12a and 12b. Note that the signal lines 30a and 30b are omitted in FIG.

  The partition walls 13a and 13b of the respective channels 12a and 12b are sheared and deformed by a driving signal supplied from an ink jet printer main body (not shown) via the signal lines 30a and 30b and the connection electrode portions 15a and 15b. The ink in 12a and 12b is ejected from the nozzles 11a and 11b. The ink ejected from the nozzles 11a and 11b flies in the longitudinal direction of the channels 12a and 12b and land on a recording material such as paper.

  Openings 141a and 141b are formed in the respective cover substrates 14a and 14b so as to correspond to the shallow groove portions of the respective channels 12a and 12b, and the first manifold 20a and the first manifold 20a are formed so as to cover the openings 141a and 141b from above. The second manifold 20b is bonded to the actuator 10.

  The first manifold 20a and the second manifold 20b are members that form the substantially rectangular parallelepiped common ink chambers 21a and 21b with the actuator 10, and are made of a synthetic resin material such as acrylic, polyetherimide, modified PPE, or polycarbonate. Is formed. Among these, polyetherimide is preferable in terms of dimensional accuracy and permeability.

  The first manifold 20a and the second manifold 20b cover the openings 141a and 141b and are provided with recesses 21a and 21b having sufficient sizes to communicate with the openings 141a and 141b. The first manifold 20a and the second manifold 20b are engaged with each other on both sides of the channels 12a and 12b (in the parallel direction), and are bonded in such a manner as to sandwich the actuator 10 therebetween. In the state where the first manifold 20a and the second manifold 20b are bonded to the actuator 10 in this way, a common ink chamber is formed between the actuator 10 and the recesses 21a and 21b.

  2 shows a state in which only the first manifold 20a is disassembled from the actuator 10. FIG.

  In FIG. 2, reference numerals 22a and 22b denote ink supply ports for supplying ink into the common ink chambers 21a and 22a, respectively. The ink supply ports 22a and 22b enter the common ink chambers 21a and 21b. The supplied ink is distributed to the channels 12a and 12b through the openings 141a and 141b.

  Here, since the first manifold 20a and the second manifold 20b are the same, the configuration of the first manifold 20a will be further described with reference to FIG. 1, FIG. 4, and FIG.

  On the contact surface of the first manifold 20 a with the actuator 10, a groove 23 a is formed so as to completely surround the periphery of the common ink chamber 21 a formed between the actuator 10. Here, completely surrounding the common ink chamber 21a means a state in which the groove 23a has a single ring shape and is recessed around the common ink chamber 21a, and there is no break in any part of the groove 23a. .

  A through hole 24a is formed on the surface of the first manifold 20a opposite to the contact surface with the actuator 10, and communicates with the inside of the groove 23a. The through hole 24a is formed in a round hole shape to which an adhesive injection needle described later can be inserted. Although the size of the through hole 24a depends on the size of the adhesive injection needle, its diameter is approximately 0.5 mm to 2.0 mm.

  The groove 23a serves as a flow path for the adhesive injected from the through hole 24a, and at the same time serves as a bonding site for bonding to the actuator 10 with the adhesive filled in the groove 23a. Since the groove 23a is provided so as to completely surround the common ink chamber 21a at the boundary with the actuator 10, it also functions to seal the common ink chamber 21a with an adhesive. For this reason, at least one groove 23a may be formed so as to surround the common ink chamber 21a, but here, three grooves 23a are formed substantially concentrically so as to surround the common ink chamber 21a. The grooves 23a, 23a, 23a are recessed.

  The depth of the groove 23a is preferably 0.1 mm to 0.6 mm, and the width is preferably 0.2 mm to 0.5 mm.

  When a plurality of grooves 23a... Are formed as in the present embodiment, the through hole 24a only needs to communicate with the inside of one of the grooves 23a. It is preferable to communicate with the outermost groove 23a farthest from 21a. As a result, the adhesive injected from the through hole 24 a into the outermost groove 23 a overflows from the groove 23 a and flows out to the common ink chamber 21 a side through the contact surface with the actuator 10. However, it is possible to prevent the outflow into the common ink chamber 21a by introducing the outflowing adhesive into the inner groove 23a.

  Further, when a plurality of grooves 23a... Are formed, a bonding area with the actuator 10 can be increased by injecting an adhesive into each groove 23a. In this case, the through holes 24a may be provided in each of the grooves 23a ..., but if one through hole 24a is connected to the inside of the plurality of grooves 23a ... Since the adhesive can be simultaneously injected into the plurality of grooves 23a through the operation of injecting the adhesive from the through hole 24a, the workability at the time of the adhesive operation can be improved.

  The number of through holes 24a communicating with the inside of one groove 23a is not limited to one, and a plurality of through holes 24a may be provided at appropriate intervals as required. When a plurality of through holes 24a are provided, any one of the through holes 24a can be used as an air vent hole when the adhesive is injected.

  The process for bonding the first manifold 20a to the actuator 10 will be described. First, the first manifold 20a is aligned with a predetermined mounting position of the actuator 10. At this time, since no adhesive is interposed between the first manifold 20a and the actuator 10, it is easy to align the two, and it is possible to easily align at a predetermined position.

  When the alignment of the first manifold 20a is completed, as shown in FIG. 5, the tip of the adhesive injection needle 50 is inserted into the through hole 24a, and the adhesive 60 is injected from the through hole 24a. The injected adhesive 60 reaches from the through hole 24 a into the groove 23 a and circulates in the lateral direction along the space formed between the groove 23 a and the actuator 10. Since the volume of this space is known in advance, the adhesive can be easily filled in the groove 23a by injecting an amount of the adhesive 60 corresponding to this volume from the adhesive injection needle 50. Therefore, it is not necessary to visually check the control of the injection amount of the adhesive 60, and since the inside of the groove 23a is a limited space, an unnecessarily large amount of adhesive is not applied.

  Moreover, since it is only necessary to inject the adhesive from one direction with respect to the through hole 24a, it is possible to easily cope with automation, which is advantageous in the case of automation.

  The adhesive 60 filled in the groove 23 a is solidified, and firmly bonds the first manifold 20 a and the actuator 10, and around the common ink chamber 21 a at the boundary portion between the first manifold 20 a and the actuator 10. Seal.

  By the way, in the present embodiment, the rear ends (the right end in FIG. 1) of the first manifold 20a and the second manifold 20b extend rearward from the cover substrates 14a and 14b of the actuator 10, and the rear end side of the actuator 10 The surface facing each of the connection electrode portions 15a and 15b protrudes toward the connection electrode portions 15a and 15b so as to reduce the distance between the connection electrode portions 15a and 15b, and is sealed between the actuator 10 and the actuator 10. Stop space portions 25a and 25b are formed.

  Each of the sealing spaces 25a and 25b communicates with the inside of the grooves 23a and 23b formed in the first manifold 20a and the second manifold 20b, and one of the adhesives 60 injected into the grooves 23a and 23b. The portion circulates in the grooves 23a and 23b and flows into the sealing spaces 25a and 25b so as to fill the sealing spaces 25a and 25b. Thus, the inside of each sealing space 25a, 25b is sealed by the adhesive 60 injected from the through holes 24a, 24b, respectively, and the connection electrode portions 15a, 15b on the rear end side of the actuator 10 are sealed. Some insulation is achieved. Therefore, according to the present embodiment, there is no need to individually insulate the connection electrode portions 15a and 15b, and the connection electrode portions 15a and 15b can be simultaneously bonded by the bonding operation of the first manifold 20a and the second manifold 20b. Since insulation can be performed, the work process can be simplified.

  Here, the inkjet head using the actuator 10 that generates the pressure change applied to the ink by shearing the partition between the channels has been described. However, in the present invention, the pressure change applied to the ink is generated. The method is not limited to this. For example, applying the distortion generated by applying an appropriate electrical signal to the piezo element, using the displacement (force fluctuation) at that time (piezo method), and the expansion pressure generated by applying heat to the pressure chamber Any of those to be used (thermal method or bubble jet (registered trademark) method) may be used.

Sectional drawing which shows one Embodiment of the inkjet head which concerns on this invention 1 is an exploded perspective view of FIG. Partial sectional view taken along line (iii)-(iii) in FIG. Bottom view of manifold Diagram explaining manifold bonding work

Explanation of symbols

DESCRIPTION OF SYMBOLS 10: Actuator 11: Nozzle plate 11a, 11b: Nozzle 12a, 12b: Channel 13a, 13b: Partition wall 14a, 14b: Cover board 141a, 141b: Opening 15a, 15b: Connection electrode part 20a: 1st manifold 20b: 2nd Manifold 21a, 21b: Common ink chamber 22a, 22b: Ink supply port 23a, 23b: Groove 24a, 24b: Through hole 25a, 25b: Sealing space 30a, 30b: Signal line 50: Adhesive injection needle 60: Adhesive Agent

Claims (9)

In a manifold of an ink jet head that forms a common ink chamber for adhering channels that generate pressure changes to ink to parallel actuators and distributing ink to each channel,
A groove is formed in the contact surface with the actuator so as to completely surround the common ink chamber formed with the actuator, and from the inside of the groove to a surface other than the contact surface with the actuator. A manifold for an ink jet head, wherein a through hole for penetrating adhesive is formed.   2. The ink jet head manifold according to claim 1, wherein there are a plurality of the grooves, and the through hole is connected to at least one groove. An actuator in which channels for generating pressure changes to be applied to the ink are arranged in parallel, and a manifold that forms a common ink chamber that adheres to the actuators and distributes ink to the respective channels. In an inkjet head that ejects ink from nozzles corresponding to channels,
In the manifold, a groove is formed on the contact surface with the actuator so as to completely surround a common ink chamber formed with the actuator, and the manifold contacts with the actuator from the inside of the groove. An ink jet head, wherein a through hole for injecting an adhesive penetrating over a surface other than the surface is formed.   4. The ink jet head according to claim 3, wherein there are a plurality of the grooves, and the through hole is connected to at least one groove.   5. The ink jet head according to claim 3, wherein the actuator and the manifold are bonded by an adhesive injected from the through hole into the groove.   A part of the groove faces a voltage application electrode part for generating a pressure change in each channel of the actuator with a gap, and the adhesive injected into the groove from the through hole 6. The ink jet head according to claim 3, 4 or 5, wherein a part of the electrode part is insulated by partially filling a gap with the electrode part. An actuator in which channels for generating pressure changes to be applied to the ink are arranged in parallel, and a manifold that forms a common ink chamber that adheres to the actuators and distributes ink to the respective channels. In a method for manufacturing an inkjet head that ejects ink from nozzles corresponding to channels,
A groove is formed on the contact surface of the manifold with the actuator so as to completely surround the common ink chamber formed between the actuator and a surface other than the contact surface with the actuator from the inside of the groove. Forming a through hole for injecting an adhesive through and positioning the manifold in contact with the actuator, and then injecting the adhesive into the through hole to fill the groove with the adhesive. A method for manufacturing an ink jet head, comprising: adhering a manifold to the manifold.   8. The method of manufacturing an ink jet head according to claim 7, wherein there are a plurality of the grooves, and the through hole is connected to at least one groove.   A part of the groove faces a voltage application electrode part for generating a pressure change in each channel of the actuator with a space therebetween, and one of the adhesive injected into the groove from the through hole. The method of manufacturing an ink jet head according to claim 7, wherein the part insulates a part of the electrode part by filling a gap with the electrode part.

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