JP2002240272A - Ink jet printer head - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an ink jet printer head in which grooves for releasing excess adhesive at the time of bonding a plurality of thin planar components in layers can be arranged with high density. SOLUTION: Along the outer circumference of ink channels 19a and 19b made, respectively, in a plurality of thin planar components 13 and 14 constituting a cavity plate, grooves 30a and 30b for releasing excess adhesive are made in any one of bonding faces of the thin planar components 13 and 14.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ink jet printer head, and more particularly, to an ink jet printer head composed of a plurality of thin plate-shaped components, a release groove for releasing excess adhesive generated when the thin plate-shaped components are laminated and bonded. And a high-density ink-jet printer head.

[0002]

2. Description of the Related Art In a conventional ink jet printer head, an ink flow comprising a plurality of nozzles, pressure chambers formed for each of the plurality of nozzles, and a common ink chamber for distributing ink to the plurality of pressure chambers. A cavity plate having a passage; and an actuator having a drive unit corresponding to each of the pressure chambers, wherein the actuator and the cavity plate are overlapped.

The cavity plate includes a nozzle plate having a plurality of nozzles, a base plate having a pressure chamber for each nozzle, and a manifold plate having a common ink chamber for distributing ink to the pressure chambers. Were laminated and bonded via an adhesive, and each plate was formed of a thin metal plate having a thickness of about 50 μm to 150 μm.

Here, when the respective plates are laminated and bonded via an adhesive, an ink flow path formed in each plate is blocked by an excess adhesive of the adhesive,
There is a problem that unevenness is generated on the surface of each plate.

Therefore, escape grooves for releasing excess adhesive generated when each plate is laminated and bonded via an adhesive are provided on both surfaces of each plate along a predetermined ink flow path.

[0006]

However, in order to prevent the adhesive from flowing into the ink flow path, the above-mentioned relief groove is provided at a position close to the ink flow path and on both of the bonding surfaces of the mutually bonded plates. In some cases, a relief groove was formed. In such a case, in order to secure the adhesion area between the ink flow path and the escape groove, and the adhesion area between the escape grooves,
A predetermined interval had to be left between them.
In such a case, in addition to the spacing between the plates, a relief groove had to be formed in consideration of assembly deviation caused when combining the respective plates. However, there is a problem that the size becomes large.

Further, when the adhesive is applied to one of the surfaces, the adhesive enters into the escape groove at the time of application, and the excess adhesive generated when the escape groove is laminated and bonded is escaping. There is a problem that the function of the above is not fulfilled.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and a plurality of release grooves for releasing excess adhesive generated when laminating and bonding a plurality of thin plate-like components can be arranged at a high density. It is intended to provide an inkjet printer head.

[0009]

In order to achieve this object, an ink jet printer head according to the present invention comprises a plurality of nozzles, a pressure chamber formed for each of the plurality of nozzles, and a plurality of pressure chambers. A cavity plate having an ink flow path including a common ink chamber for distributing ink to the chambers; and an actuator having a drive unit corresponding to each of the pressure chambers. The actuator and the cavity plate are overlapped. The cavity plate is formed by laminating and bonding a plurality of thin plate-shaped components respectively constituting the pressure chamber and the common ink chamber via an adhesive, and is formed of each of the thin plate-shaped components. On the outer periphery of the ink flow path, the surplus of the adhesive is applied only to one of the adhesive surfaces mutually adhered to other thin plate-shaped parts. Escaping groove escape Chakuzai is recessed.

According to the ink jet printer head of the first aspect, the ink supplied from the ink tank is distributed to the plurality of pressure chambers by the common ink chamber.
Pressure is applied to the plurality of pressure chambers to which the ink is distributed by an actuator having a driving unit provided corresponding to the plurality of pressure chambers. Then, the ink is supplied to the nozzle corresponding to the pressure chamber in which the pressure fluctuation has occurred, and is discharged onto the printing surface.

Here, a relief groove is formed in a plurality of thin plate-like parts constituting the cavity plate along the outer periphery of an ink flow path including a common ink chamber and a pressure chamber. Excess adhesive generated when laminating and bonding the thin plate-shaped components is prevented from flowing into the ink flow path by a relief groove formed in one of the bonding surfaces bonded to each other. .

According to a second aspect of the present invention, there is provided the ink jet printer head according to the first aspect, wherein the relief grooves are formed in a plurality of rows on the outer periphery of the ink flow path.

According to a third aspect of the present invention, there is provided an ink jet printer head according to the first aspect, wherein the number of the thin plate-like parts is three or more, and each of the thin plate parts is bonded to another thin plate part. The relief groove is recessed on the same surface.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a perspective view showing a color inkjet printer as one embodiment of the inkjet printer head of the present invention.
In FIG. 1, this color inkjet printer 10
Reference numeral 0 denotes an ink cartridge 61 filled with, for example, four color inks of cyan, magenta, yellow, and black, a head unit 63 having a piezoelectric inkjet head 6 for printing on paper 62, and an ink cartridge 61. And a carriage 64 on which the head unit 63 is mounted, a driving unit 65 for reciprocating the carriage 64 in a linear direction, and a carriage 6
The platen roller 66 includes a platen roller 66 that extends in the reciprocating direction of the ink jet head 4 and faces the piezoelectric inkjet head 6, and a purge device 67.

The drive unit 65 includes a carriage shaft 71 disposed at the lower end of the carriage 64 and extending parallel to the platen roller 66; a guide plate 72 disposed at the upper end of the carriage 64 and extending parallel to the carriage shaft 71; The pulley 73 includes two pulleys 73 and 74 disposed between the shaft 71 and the guide plate 72 at both ends of the carriage shaft 71, and an endless belt 75 stretched between the pulleys 73 and 74.

When one pulley 73 is rotated forward and backward by the driving of the motor, the carriage 64 joined to the endless belt 75 is driven by the forward and reverse rotation of the pulley 73 to move the carriage shaft 71 and the guide. It is reciprocated in a linear direction along the plate 72.

The paper 62 is supplied to a paper feed cassette (not shown) provided on the side of the color inkjet printer 100.
, And is introduced between the piezoelectric inkjet head 6 and the platen roller 66 to perform predetermined printing with ink ejected from the piezoelectric inkjet head 6, and then ejected. In FIG. 1,
The illustration of the paper feed mechanism and the paper discharge mechanism of the paper 62 is omitted.

The purge device 67 is provided on the side of the platen roller 66 and is disposed so as to face the piezoelectric ink jet head 6 when the head unit 63 is at the reset position. The purge device 67 includes a purge cap 81 that abuts against an opening surface of the nozzle of the piezoelectric inkjet head 6 so as to cover a plurality of nozzles, which will be described later, a pump 82 and a cam 83, and an ink storage unit 8.
When the head unit 63 is at the reset position, the nozzles of the piezoelectric inkjet head 6 are covered with a purge cap 81 to remove defective ink including air bubbles accumulated inside the piezoelectric inkjet head 6. The piezoelectric ink-jet head 6 is recovered by suction by the pump 82 by driving the cam 83. The sucked defective ink is stored in the ink storage unit 84.

The cap 85 covers the plurality of nozzles 15 (see FIG. 2) of the piezoelectric ink jet head 6 mounted on the carriage 64, which is returned to the reset position when printing is completed, in order to prevent drying of the ink. .

FIG. 2 shows the nozzle 15 of the head unit 63.
FIG. 2 shows a perspective view with the side up. As shown in FIG. 2, the head unit 63 mounted on the carriage 64 traveling along the sheet 62 is formed in a substantially box shape with an open top, and the four ink cartridges 61 from above.
The ink supply passages 4 a, 4 b, 4 c, and 4 d that can be connected to the ink discharge section of each ink cartridge 61 are provided on one side of the mounting section. To the lower surface of the. The ink supply passages 4a, 4b, 4c, and 4d have
A packing 47 made of rubber or the like, which can be in close contact with an ink supply hole 19a described later, is provided.

On the lower surface side of the bottom plate 5, four support portions 8 for arranging four piezoelectric ink jet heads 6 in parallel are formed in a stepped shape. Each support portion 8 has a plurality of cavities 9a, 9 for fixing the head 6 with a UV adhesive.
b is formed so as to penetrate vertically.

FIG. 3 is a perspective view of the piezoelectric ink jet head 6. As shown in FIG. 3, the piezoelectric inkjet head 6 includes a laminated cavity plate 10, a plate-type piezoelectric actuator 20 that is bonded and laminated to the cavity plate 10 via an adhesive or an adhesive sheet, A flexible flat cable 40 is formed on the upper surface of the cavity plate 10 with an adhesive so as to be electrically connected to an external device.
Ink is ejected downward from.

FIG. 4 is an exploded perspective view of the cavity plate 10. As shown in FIG. FIG. 5 shows the cavity plate 1
FIG. 5 is an exploded enlarged perspective view (cross section taken along the line VV in FIG. 3) of FIG. As shown in FIG. 4, the cavity plate 10 has a structure in which five thin metal plates of a nozzle plate 11, two manifold plates 12X, a 12Y spacer plate 13, and a base plate 14 are respectively overlapped and bonded with an adhesive. It is. In the present embodiment, each of these plates 11 to 14 is a 42% nickel alloy steel plate (42
Alloy) and has a thickness of about 50 μm to 150 μm. In addition, each of these plates 11 to 14 is not limited to being made of metal, and may be formed of, for example, resin.

As shown in FIG. 5, a plurality of narrow pressure chambers 16 extending in a direction perpendicular to the longitudinal direction of the base plate 14 are formed in the base plate 14 in two rows in a staggered arrangement. Further, on the spacer plate 13 side of the base plate 14, a throttle portion 16d connected to each pressure chamber 16 and an ink supply hole 16b connected to the throttle portion 16d are recessed. Each ink supply hole 16b
Are connected to the common ink chamber 12a in the manifold plate 12X through the respective ink supply holes 18 formed in the left and right sides of the spacer plate 13. Here, the cross-sectional area orthogonal to the direction in which the ink flows in each of the constricted portions 16 d is smaller than the cross-sectional area of each of the pressure chambers 16. This is the diaphragm 16d
Is to increase the flow path resistance by reducing the cross-sectional area of.

One end 16a of each pressure chamber 16 is connected to the staggered nozzles 15 of the nozzle plate 11 with the spacer plate 13 and the two manifold plates 12
X and 12Y are communicated with each other via a small-diameter through hole 17 which is also formed in a staggered arrangement.

The base plate 14 and the spacer plate 13 have two ink supply holes 19a for supplying ink from a common ink cartridge to two common ink chambers 12a in the manifold plate 12, as shown in FIG. 19b are respectively formed.

Two manifold plates 12X, 12
As shown in FIG. 4, Y has two common ink chambers across the row of the plurality of nozzles 15 in the nozzle plate 11.
And extends long in parallel with the nozzle row. The common ink chambers 12 a and 12 b are located in a plane parallel to a plane formed by the plurality of pressure chambers 16 in the base plate 14, and are closer to the opening surfaces of the plurality of nozzles 15 in the nozzle plate 11 than the plurality of pressure chambers 16. It is located in.

The common ink chambers 12a and 12b have a shape whose cross-sectional area decreases at a constant rate in a direction away from the ink supply holes 19a and 19b at an end portion away from the ink supply holes 19a and 19b. . This is to make it easier to discharge residual air bubbles that are likely to accumulate at the ends of the common ink chambers 12a and 12b. Further, the other end of the upper common ink chamber 12a is bent toward the center to communicate with the ink supply 19a and the like, and the other end of the common ink chamber 12b is a cap contacted from the nozzle plate 11 side. It is formed linearly to receive the contact pressure of 81, 85 (see FIG. 1). The upper surface of the upper common ink chamber 12a is sealed by stacking the spacer plate 13 on the manifold plate 12X. The lower common ink chamber 12b has a closed bottom and is recessed in the manifold plate 12Y.

As shown in FIG. 4, the nozzle plate 11 is provided with a plurality of ink discharge nozzles 15 having a very small diameter (about 25 μm in the present embodiment).
Are formed in a zigzag arrangement at intervals of a minute pitch P along the longitudinal direction of.

Next, a method of assembling the cavity plate 10 will be described. FIG. 6 is a perspective view showing a lead frame for each of the four types of plates 12Y, 12X, 13 and 14. As shown in FIG. 6, four lead frames 12YA, 12XA, 13A, and 14A are stacked and bonded and fixed.
In 2YA to 14A, manifold plates 12Y and 12X as thin plate-shaped parts on which a predetermined pattern is formed,
It is assumed that the spacer plate 13 and the base plate 14 are arranged continuously at regular intervals. That is, the base plate 14 in the above embodiment is formed on the lead frame 14A serving as the lowermost layer so as to be arranged at regular intervals. The tie bars 104 are connected at appropriate intervals between the left and right elongated frame frames 102. Similarly, spacer plates 13 are formed at the same intervals as above on the second-layer lead frame 13A from the bottom. Manifold plates 12X are formed at the same intervals as above on the third-layer lead frame 12XA from below. The other manifold plate 12Y is formed on the uppermost lead frame 12YA at the same interval as described above. A positioning hole 105 is formed in the frame 102 of each of the lead frames 12YA to 14A. The plates 12Y, 12X, 13 and 14 are connected to the frame 102 by connecting pieces 106 having a very small width.

These lead frames are provided with positioning holes 1.
05 into the lowermost lead frame 14A
And the uppermost lead frame 12YA is bonded and fixed by applying a clamping force or a pressing force. Then, as shown in FIG. 7, a relief groove 30 for releasing excess adhesive of the adhesive is formed on one surface of each of the base plate 14, the lowermost layer, the spacer plate 13 and the manifold plate 12X of the second layer from below. Is formed.

Here, the reason why the escape groove 30 for allowing the excess adhesive to escape is formed on only one side of each plate will be described with reference to FIG. FIG. 8 is a diagram schematically showing a cross-sectional view taken along the line VIII-VIII in FIG. 7 in comparison with a conventional relief groove forming pattern. FIG. 8A is a diagram showing a conventional pattern for forming a relief groove, and FIG. 8B is a diagram showing a pattern for forming a relief groove according to the present invention.

Conventionally, an ink supply hole 1 serving as an ink flow path
9a and a base plate 14 in which a relief groove 43a is formed along the outer periphery of the ink supply hole 19a, and a spacer plate 13 in which an ink supply hole 19b and a relief groove 45b are formed along the outer periphery of the ink supply hole 19b. Is laminated and bonded via an adhesive so that the ink supply holes 19a and 19b communicate with each other.
The relief groove 45b in 3 must be formed so as to be arranged on the outer periphery of the relief groove 43a in order to secure a bonding area. In such a case, a predetermined distance from the escape groove 43a, the spacer plate 13 and the base plate 14
When the assembly groove P is stacked, the gap G must be taken into consideration. Therefore, if the escape groove 45b is not provided at the position of the escape groove 46a after all, the bonding area in the case where the assembly gap P occurs can be secured. Did not.

On the other hand, according to the present invention, since the escape grooves 30a and 30b are both formed on the base plate 14, even if the combination is misaligned when combined with the spacer plate 13, the escape grooves 30a and 30b are formed. 30b
Therefore, even when the relief groove 30b is formed, there is no need to consider an assembly deviation. Therefore, by arranging the escape grooves 30a and 30b only on one side of the surface to be bonded to each other, the escape grooves can be formed in a narrow range.

Specifically, each relief groove width W is set to 100 μm.
m, and the assembly deviation P is ± 30 μm, conventionally, the gap Q between the edge of the ink supply hole 19 a and the edge of the escape groove 43 a is required to be 90 μm in consideration of the bonding interval of 60 μm and the assembly deviation of 30 μm. The distance R between the rim of the escape groove 43a and the rim of the escape groove 46a needs to be 90 μm in consideration of the bonding interval of 60 μm and the assembly deviation of 30 μm. That is, between the edge of the ink supply hole 19a and the relief groove 46a (Q + W + R), 90 μm + 100 μm + 90 μm
= 280 μm is required.

On the other hand, in the present embodiment, the distance S between the edge of the ink supply hole 19a and the edge of the escape groove 30a is 90 μm in consideration of the bonding interval of 60 μm and the assembly deviation of 30 μm.
m is necessary, and the edge of the escape groove 30a and the escape groove 30b
It is not necessary to consider the assembly gap 30 μm for T between the edge and the adhesive gap 60 μm. That is, between the edge of the ink supply hole 19a and the edge of the escape groove 30b (S +
W + T), 90 μm + 100 μm + 60 μm = 25
0 μm is required. Therefore, the present application is 280 compared to the prior art.
The relief groove can be formed in a narrow range of μm−250 μm = 30 μm.

Thus, one side of the plate on which the relief groove 30 is formed and one side of the plate on which the relief groove 30 is not formed are laminated. Here, the adhesive is applied in advance to one surface of each plate on which the relief groove 30 is not formed. This is because the adhesive can be uniformly applied by applying the adhesive to the other adhesive surface where the relief groove 30 is not formed. Conversely, if an adhesive is applied to the adhesive surface on which the escape groove 30 is formed, the adhesive may enter the escape groove when the adhesive is applied,
This is because in such a case, the original function of the escape groove for allowing the excess adhesive to escape is impaired.

A relief groove 30 is also formed on the outer periphery of the common ink chambers 12a and 12b and the pressure chamber 16.
The relief groove 30 is formed simultaneously with the ink supply holes 19a and 19b, the common ink chambers 12a and 12b, and the pressure chamber 16 by etching or the like.

Also, since each plate has a relief groove 30 recessed on the same surface to be bonded to the other plate (see FIG. 7), the relief groove 3 is provided in each plate.
When forming 0, it is not necessary to invert the thin plate-shaped component, and the process of forming the escape groove 30 is simplified. further,
Since the relief groove 30 does not concentrate on one plate, the strength of the plate can be appropriately maintained.

The connecting piece 106 is cut from the lead frames 12YA to 14A stacked and fixed as described above, and the integrated cavity plate 10 is removed.

On the other hand, the piezoelectric actuator 20 (FIG. 3) has a structure in which a plurality of piezoelectric sheets are laminated, and as described in Japanese Patent Application Laid-Open No. 4-341851, the lowermost piezoelectric sheet among the piezoelectric sheets is provided. On the upper surface (wide surface) of the odd-numbered piezoelectric sheets counted upward, narrow individual electrodes (not shown) are formed at locations corresponding to the respective pressure chambers 16 in the cavity plate 10. A common electrode (not shown) common to the plurality of pressure chambers 16 is provided on the upper surface (wide surface) of the even-numbered piezoelectric sheet from the bottom.
Is formed, and on the upper surface of the top sheet at the top,
A surface electrode 26 (FIG. 3) electrically connected to each of the individual electrodes and a surface electrode 27 (FIG. 3) electrically connected to each of the common electrodes are provided. .

Next, the piezoelectric actuator 20 is bonded and fixed to the cavity plate 10 with its individual electrodes corresponding to each of the pressure chambers 16 in the cavity plate 10. On the upper surface of the piezoelectric actuator 20, the flexible flat cable 40 (FIG. 3) is pressed in an overlapping manner so that various wiring patterns (not shown) of the flexible flat cable 40 are applied to the respective surfaces. The electrodes 26 and 27 are electrically connected.

In this configuration, by applying a voltage between any of the individual electrodes of the piezoelectric actuator 20 and the common electrode, the voltage is applied to the portion of the piezoelectric sheet to which the voltage is applied. Distortion occurs in the stacking direction due to piezoelectricity, and the internal volume of the pressure chamber 16 corresponding to each of the individual electrodes is reduced by the distortion. A predetermined printing is performed by jetting.

As described above, according to the piezoelectric ink jet head 6 of the present embodiment, the cavity plate 1
Reference numeral 0 denotes a plurality of plates 12X, 12Y, 1 and 1 constituting the pressure chamber 16 and the common ink chambers 12a and 12b, respectively.
3 and 14 are laminated and bonded via an adhesive, and each plate 12X and the like have a common ink chamber 12a.
In the outer periphery of the ink flow path, etc., the escape groove 30 for allowing the excess adhesive of the adhesive to escape is provided only on one of the adhesive surfaces mutually adhered to the other plates. The relief groove can be formed without considering the misalignment, and the relief groove 30 can be arranged at a high density.
Further, if the adhesive is applied to the other adhesive surface where the relief groove 30 is not formed, the adhesive can be applied uniformly.

Although the present invention has been described based on the above embodiments, the present invention is not limited to the above embodiments, and various improvements and modifications can be made without departing from the gist of the present invention. That can be easily inferred.

For example, in the above embodiment, the common ink chamber is formed by laminating two manifold plates 12X and 12Y to facilitate the formation of the common ink chamber. However, the present invention is not limited to this. A common ink chamber can be formed by one or a plurality of manifold plates.

[0047]

According to the ink jet printer head of the present invention, a plurality of nozzles, pressure chambers formed for each of the plurality of nozzles, and a common ink chamber for distributing ink to the plurality of pressure chambers. A cavity plate having an ink flow path formed of, for example, and an actuator having a driving unit corresponding to each of the pressure chambers. The actuator and the cavity plate are formed so as to overlap with each other, and the cavity plate Is formed by laminating and bonding a plurality of thin plate-shaped components respectively constituting the pressure chamber and the common ink chamber via an adhesive, and the outer periphery of the ink flow path of each of the thin plate-shaped components is provided with another An escape groove for allowing the excess adhesive of the adhesive to escape is provided in only one of the adhesive surfaces mutually bonded to the thin plate-shaped component. Therefore, as in the case of forming a release groove on the opposite side of each thin plate-like component, it can be formed without considering interference with other release grooves, and the release grooves are densely arranged at a position close to the ink flow path. This can effectively prevent the flow of the adhesive into the ink flow path, and can contribute to downsizing of the ink jet printer.

Further, since the relief groove is recessed only on one of the adhesive surfaces bonded to each other, the adhesive is uniformly applied by applying the adhesive to the other adhesive surface where the relief groove is not formed. It is possible to prevent the adhesive from entering the escape groove at the time of applying the adhesive and to impair the function of the escape groove, so that the excess adhesive can be efficiently released. .

According to the ink jet printer head of the second aspect, in addition to the effect of the ink jet printer head of the first aspect, the relief grooves are formed in a plurality of rows on the outer periphery of the ink flow path, so that the ink is formed in a plurality of rows. There is an effect that the flow of the adhesive into the flow path can be efficiently prevented.

According to the ink jet printer head of the third aspect, in addition to the effect of the ink jet printer head of the first aspect, there are three or more thin plate-like parts, and each thin plate-like part has another thin plate-like part. Since the relief groove is formed in the same surface to be bonded to the component, the relief groove is formed only on one surface of three or more thin plate-shaped components. That is, since no escape groove is formed on both surfaces of one thin plate component sandwiched between two thin plate components, the thin plate component is turned over when forming the escape groove in each thin plate component. There is no necessity, and there is an effect that the manufacturing process can be simplified. In addition, since the escape groove does not concentrate on one thin plate-shaped component, there is an effect that the strength of the thin plate-shaped component can be appropriately maintained.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a color inkjet printer as an embodiment of an inkjet printer head of the present invention.

FIG. 2 is a perspective view of the head unit with the nozzle side facing upward.

FIG. 3 is a perspective view of each component of the inkjet printer head.

FIG. 4 is an exploded perspective view of a cavity plate.

FIG. 5 is an exploded enlarged perspective view of a cavity plate.

FIG. 6 is a perspective view of a lead frame of each plate.

FIG. 7 is an exploded perspective view showing a relief groove formed in each plate.

FIG. 7 shows a comparison with a conventional relief groove formation pattern.
It is VIII-VIII sectional drawing in.

[Explanation of symbols]

Reference Signs List 6 Piezoelectric inkjet head 10 Cavity plate 11 Nozzle plate (thin plate) 12X, 12Y Manifold plate (thin plate) 12a, 12b Common ink chamber (ink flow path) 13 Spacer plate (thin plate) 14 Base plate (thin plate) Parts) 15 Nozzle 16 Pressure chamber (ink flow path) 19a, 19b Ink supply hole 20 Piezoelectric actuator 30 Escape groove 61 Ink cartridge (ink supply source) 100 Color inkjet printer

Claims (3)

[Claims] A cavity plate having a plurality of nozzles, a pressure chamber formed for each of the plurality of nozzles, and an ink flow path including a common ink chamber for distributing ink to the plurality of pressure chambers; An actuator having an actuator having a drive unit corresponding to each of the pressure chambers, wherein the ink jet printer head is formed by stacking the actuator and the cavity plate, wherein the cavity plate includes the pressure chamber and the common ink chamber. Each of the plurality of thin plate-shaped components is laminated and bonded via an adhesive, and is bonded to other thin plate-shaped components on the outer periphery of the ink flow passage of each thin plate-shaped component. A release groove for allowing excess adhesive of the adhesive to escape is provided in only one of the adhesive surfaces. Jet printer head. 2. The ink jet printer head according to claim 1, wherein the relief grooves are formed in a plurality of rows on the outer periphery of the ink flow path. 3. The thin plate-shaped component is characterized in that there are three or more thin plate-shaped components, and in each of the thin plate-shaped components, the relief groove is recessed on the same surface to be bonded to another thin plate-shaped component. The ink-jet printer head according to claim 1.