JP2000280473A - Ink jet recording head and method of manufacturing the same - Google Patents

Abstract

(57) [Summary] [Problem] It is possible to position a flow path unit and a head case without trouble, and ink does not accumulate in a hole used for positioning on a nozzle forming surface of a recording head. To provide an ink jet recording head. In a method of manufacturing a recording head, a positioning pin is inserted into a positioning hole from a positioning through hole, and a flow path unit is inserted.
When positioning the head case 119 with the head case 119, the bottom of the positioning hole 210 is a pin receiving portion 211 formed of a small-diameter portion 212 protruding inward, so that the positioning pin does not fall out of the positioning hole 210. . Further, after the flow path unit 118 and the head case 119 are overlapped, the positioning pins 220 are left in the positioning through holes 210, so that ink does not accumulate in the positioning through holes 200.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ink jet recording head (hereinafter, referred to as a recording head) of an ink jet recording apparatus used as an ink jet printer or an ink jet plotter, and a method of manufacturing the recording head. For more information,
The present invention relates to a technique for positioning a flow path unit constituting a recording head and a head case.

[0002]

2. Description of the Related Art In order to manufacture a recording head of an ink jet recording apparatus used as an ink jet printer or an ink jet plotter, conventionally, a nozzle plate having a plurality of nozzle openings and a pressure generating chamber communicating with each of the nozzle openings are conventionally used. A flow path unit in which an elastic plate in which a vibrating region overlapping each of the formed flow path forming plate and the pressure generating chamber is formed in an island shape is stacked in this order, and a plurality of pressure generating elements for vibrating the vibrating region. The pressure generating elements are brought into contact with the respective vibration regions of the elastic plate by superimposing the head case on which the is supported.

In the recording head configured as described above, when the pressure generating element is driven, the pressure generating element vibrates the vibration area to pressurize the ink in the pressure generating chamber communicating with the nozzle opening, and the ink droplet is discharged from the nozzle opening. Discharge.
Therefore, in order to manufacture a recording head, it is necessary to accurately position the flow path unit and the head case, and to accurately overlap the vibration region of the elastic plate with the pressure generating element. Therefore, in the related art, two first positioning through holes are formed in the flow channel unit, and the first positioning through hole is formed in each of the positions on the flow channel unit mounting surface of the head case that overlap the first positioning through hole. In order to position the flow path unit in the head case, a positioning pin is inserted into the second positioning through hole, and the positioning unit is positioned in the inserted positioning pin. Positioning was performed by setting through holes. At this time, the positioning pins protrude from the nozzle plate for the workability of positioning, and in order to avoid the problem of paper jam and paper rubbing,
After the joining of the channel unit and the head case, the positioning pins are pushed down to the nozzle plate surface.

Further, if the positioning pins are pulled out after the positioning is completed, the positioning holes are opened, and there is a risk that ink may accumulate in the holes and contaminate a recording medium such as recording paper. It is necessary to push until. Therefore, the lower end opening of the positioning through hole formed in the head case is crushed by secondary processing using a punch or the like so that the positioning pin can be temporarily ejected until the passage unit and the head case are completed. And minute projections are formed in the positioning holes.

[0005]

However, in recent years, due to demands for increasing the number of nozzles in the ink jet head and increasing the pitch of the nozzle holes, extremely high rigidity is required for the head case. Many high-rigidity members have low toughness, and when trying to form microprojections by secondary processing as in the prior art, members without toughness are chipped, and microprojections are formed in the positioning holes. There is a problem that it cannot be formed. Also, as described above, if the positioning holes are open, ink may accumulate in the holes and soil the recording medium such as recording paper, so it is necessary to push the positioning pins to the nozzle plate surface after the alignment is completed. There is.

[0006]

According to the present invention, there is provided a nozzle plate having a plurality of nozzle openings formed therein, and a flow path forming plate having a pressure generating chamber communicating with each of the nozzle openings. A head in which a plurality of pressure generating elements for vibrating the vibrating region are supported, and a flow path unit in which elastic plates each having a vibrating region formed in an island shape and overlapping with each of the pressure generating chambers are stacked in this order. In an ink jet recording head in which a case is overlapped and the pressure generating element abuts on a vibration region of the elastic plate, at least two positioning through holes are formed in the flow path unit, while the head case is formed in the head case. A positioning hole overlapping with each of the positioning through holes is formed, and the overlapping positioning through hole and the positioning The positioning pin is inserted in use holes, the the bottom side of the positioning holes, characterized in that it includes a pin receiving portion for receiving the lower end of the positioning pin.

In the recording head according to the present invention, when positioning the flow path unit and the head case by inserting positioning pins from the positioning through holes into the positioning holes, a pin receiving portion is formed at the bottom of the positioning hole. As a result, the positioning pin does not fall out of the positioning hole. Therefore, even if a material having no toughness is used for the material of the head case, there is no need to perform a secondary processing using a punch or the like so that the positioning pin does not come off when the positioning pin is inserted into the positioning hole from the positioning through hole. The positioning operation can be performed without trouble. Further, even after the alignment between the flow path unit and the head case is completed, the positioning pins are left as they are inside the positioning through holes and the positioning holes. Therefore, since the positioning through holes are filled with the positioning pins on the nozzle forming surface (nozzle plate) of the recording head, ink does not accumulate there and does not stain recording media such as recording paper.

In the present invention, it is preferable that the head case has a case main body and the pin receiving portion integrally formed of a thermosetting resin.

In the present invention, the pin receiving portion may be a small-diameter portion in the positioning hole, a protrusion projecting into the positioning hole, or a thin portion closing the bottom of the positioning hole. Can be.

In the present invention, a nozzle plate having a plurality of nozzle openings, a flow path forming plate having a pressure generating chamber communicating with each of the nozzle openings, and a vibration region overlapping each of the pressure generating chambers are provided. A flow path unit in which elastic plates formed in an island shape are stacked in this order is superimposed on a head case in which a plurality of pressure generating elements for vibrating the vibration region are supported, and the pressure generating elements are elastically connected. In the method of manufacturing an ink jet recording head that abuts the vibration region of the plate, at least two positioning through holes are formed in the flow path unit,
In the head case, positioning holes are formed at positions overlapping with the positioning through holes, and when the flow path unit is overlapped with the head case, the positioning holes are removed from the positioning through holes. The positioning pin is inserted into the positioning hole, and the lower end of the inserted positioning pin is supported by a pin receiving portion formed on the bottom side of the positioning hole.

In the present invention, the upper end of the positioning pin is pushed into the nozzle plate surface after the positioning of the head case and the flow path unit is completed.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An ink jet recording apparatus to which the present invention is applied and a recording head used therefor will be described with reference to the drawings.

[Overall Configuration of Inkjet Recording Apparatus] FIG. 1 is a perspective view showing the configuration of an inkjet recording apparatus to which the present invention is applied. In FIG. 1, an ink jet recording apparatus 1 of the present embodiment is used by being connected to a computer (not shown) together with a scanner (not shown) and the like. When a predetermined program is loaded and executed on the computer, the entirety of these devices integrally functions as a recording device. On the computer,
An application program operates under a predetermined operating system, and displays an image on a CRT display (not shown) while performing predetermined processing on an image or the like read from a scanner. When the application program issues a print command, the computer converts image data read via a scanner, character data input via a keyboard, and the like into data used by the inkjet printing apparatus 1. Output to

In the ink jet recording apparatus 1, a carriage 11 is connected to a carriage motor 13 via a timing belt 12, and is guided by a guide member 14 so as to reciprocate in the width direction of the recording paper 15 (medium). I have. The inkjet recording apparatus 1 is also provided with a paper feed mechanism using a paper feed roller 16. An ink jet recording head 10 is attached to a surface of the carriage 11 which faces the recording paper 15, in the example shown in FIG. The recording head 10 receives ink replenishment from an ink cartridge 17 placed on the upper part of the carriage 11 and discharges ink droplets onto the recording paper 15 in accordance with the movement of the carriage 11 to form dots.
5 to print an image or text.

A capping device 18 is provided in a non-printing area (non-recording area) of the ink jet recording apparatus 1, and seals a nozzle opening of the recording head 10 during a pause of printing. Therefore, it is possible to suppress the ink from thickening or forming an ink film due to the solvent being scattered from the ink during the suspension of printing. Therefore, it is possible to prevent the nozzle from being clogged while the printing is stopped. Further, the capping device 18 receives ink droplets from the recording head 10 due to a flushing operation performed during a printing operation. A wiping device 19 is arranged in the vicinity of the capping device 18, and the wiping device 19 is configured to wipe off ink residue and paper dust adhered thereto by wiping the surface of the recording head 10 with a blade or the like. I have.

[Structure of Recording Head] FIG. 2 is an enlarged sectional view showing one of the actuators formed on the recording head 10. FIG. 3 is an exploded perspective view of a recording head of the ink jet recording apparatus shown in FIG. FIG.
FIG. 4 is an explanatory diagram schematically showing a structure of each member constituting the recording head shown in FIG. 3.

In FIG. 2, in the recording head 10, nozzle openings 111 are formed in the nozzle plate 110, and the flow path forming plate 112 communicates with the through holes that define the pressure generating chamber 113, and communicates with the pressure generating chamber 113 on both sides. This is a silicon substrate in which a through hole or a groove that defines two ink supply ports 114 and a through hole that defines a common reservoir 115 that communicates with these ink supply ports 114 are formed. The elastic plate 116 is formed of a composite plate of a thin plate such as a stainless steel plate 116a and a resin film 116b, and the portion where the tip of the pressure generating element 100 such as a piezo element (piezoelectric vibrator) contacts the stainless steel plate 116a has an island shape. Is the vibration region 116c left. The nozzle plate 110, the flow path forming plate 112, and the elastic plate 116 configured as described above are stacked in this order to form a flow path unit 118.

On the side of the head case 119, an accommodation chamber 120 for accommodating the pressure generating element 100 so as to vibrate and a window 121 for supporting the flow path unit 118 are formed. The pressure generating element 100 is fixed by a fixed substrate 122 in a state where it is exposed. The head case 119 is provided in the vibration region 1 of the elastic plate 116.
The recording head 10 is assembled by fixing the flow path unit 118 so as to cover the window 121 with the front end portion of the pressure generating element 100 abutting on 16c.

In order to manufacture the recording head 10 having such a structure, as shown in FIGS. 3 and 4, the nozzle plate 110 in which the nozzle openings 111 are formed in a plurality of rows communicates with each of the nozzle openings 111. Flow path forming plate 112 in which pressure generating chamber 113 is formed, and pressure generating chamber 113
The elastic plates 116 in which the vibrating regions 116c overlapping each of them are formed in an island shape are stacked in this order, and the flow path unit 118
Is formed, the flow path unit 118 is connected to the pressure generating element 10.
The pressure generating elements 100 are brought into contact with the respective vibrating regions 116c of the elastic plate 116 by superimposing the head cases 119 on the head case 119 on which the elastic member 116 is supported. After assembling in this manner, the cover 124 is put on.

Here, the nozzle plate 110 has a nozzle opening 111 formed in a thin plate such as a stainless steel plate. In the flow path forming plate 112, a through hole formed in the silicon substrate forms a reservoir 115, and a pressure generating chamber 113 elongated from the reservoir 115 to a position overlapping the nozzle opening 111 of the nozzle plate 110. Have been. As for the elastic plate 116, a stainless steel portion is left as an island-shaped vibration region 116c with respect to a region overlapping with the pressure generating chamber 113, with respect to a composite plate composed of the stainless steel plate 116a and the resin film 116b.
Only the resin film 116b is left around the vibration region 116c. In addition, an ink supply hole 116d is formed in the elastic plate 116 in a region overlapping the reservoir 115.

A window 121 is opened in the head case 119, and a plurality of pressure generating elements 100 formed on a stationary substrate 122 made of stainless steel are formed in the head case 119.
Is inserted, the tip of the pressure generating element 100 enters the inside of the window 121. This pressure generating element 100
, The flexible substrate 123 is electrically connected, and a drive signal is applied to each pressure generating element 100. Note that an ink supply tube 125 is formed in the head case 119.

Embodiment 1 FIGS. 5A and 5B
(C) is a cross-sectional view showing a method of aligning the flow path unit and the head case when manufacturing the recording head according to the first embodiment of the present invention, for aligning the flow path unit and the head case. FIG. 4 is an enlarged sectional view showing the method of FIG. 1 and an explanatory view showing an enlarged bottom portion of a positioning hole formed in the head case. FIGS. 6A and 6B are cross-sectional views of a flow path unit and a head case after being superimposed upon manufacturing the recording head according to the first embodiment of the present invention, and enlarged main portions thereof. FIG.

Referring again to FIG. 2, when the pressure generating element 100 is driven in the recording head 10 configured as described above, the pressure generating element 100 vibrates the vibration area 116c to communicate with the nozzle opening 111.
Ink 13 is pressurized, and ink droplets are ejected from the nozzle opening 111. That is, the charging pulse is applied to the pressure generating element 1
7, the pressure generating element 17 is connected to the pressure generating chamber 11
The pressure generating chamber 113 is deflected to expand the volume of No. 3 and generates a negative pressure in the pressure generating chamber 113. As a result, the meniscus is in nozzle opening 1
When the pressure generating element 17 is retracted from the position 11 and then a discharge pulse is applied, the pressure generating element 17 bends in a direction to reduce the volume of the pressure generating chamber 113, and a positive pressure is generated in the pressure generating chamber 113. As a result, ink droplets are ejected from the nozzle openings 111. In any of these operations, the expansion and contraction of the pressure generating element 17 are transmitted through the vibration region 116c of the elastic plate 116. Therefore, in order to manufacture the recording head 10, the flow path unit 118 and the head case 119 are accurately positioned, and the vibration region 116c of the elastic plate 116 and the pressure generating element 1
It must be exactly overlapped with 00.

Therefore, in this embodiment, FIGS.
As shown in (A) and (B), each of the nozzle plate 110, the flow path forming plate 112, and the elastic plate 116 constituting the flow path unit 118 has two positioning through holes 200 (about 0.7φ) of about 0.7φ. On the other hand, two positioning holes 210 of about 0.7φ are formed at positions overlapping the positioning through holes 200 on the flow path unit mounting surface 119a of the head case 119. When positioning the flow path unit 118 in the head case 119, the positioning pins 220 are inserted into the head case 119, and the positioning holes 200 of the flow path unit 118 are inserted into the positioning pins 220. And the head case 119 are positioned. Therefore, the vibration region 116c of the elastic plate 116
And the pressure generating element 100 exactly overlap.

Here, at the bottom of the positioning hole 210,
As shown in FIGS. 5B and 5C, the positioning pin 220
A pin receiving portion 211 for receiving the lower end of the pin is formed.
In the present embodiment, the pin receiving portion 211 has a small diameter portion 21 in which the bottom of the positioning hole 210 slightly protrudes inward.
It is 2. This small diameter portion 212 (pin receiving portion 21)
1) is a part formed integrally with the case main body when the head case 119 is molded from a thermosetting resin.

As described above, in manufacturing the recording head 10 of this embodiment, as shown in FIGS. 6A and 6B, the positioning head 21 is moved from the positioning through hole 200 to the positioning hole 21.
When the positioning pins 220 are inserted into the respective channels 0 and the channel unit 118 and the head case 119 are positioned, the bottom of the positioning hole 210 is a pin receiving portion 211 formed of a small-diameter portion 212 protruding inward. The positioning pins 220 do not fall out of the positioning holes 210. Therefore, when the positioning pin 220 is inserted into the positioning through hole 210, the positioning pin 22
Since there is no need to hold the positioning pin 220 so that 0 does not fall off, the positioning operation can be performed without any trouble.

In this embodiment, as shown in FIG. 8, after the alignment of the flow path unit 118 and the head case 119 is completed, the pin receiving portion is broken by pushing the positioning pin 220, and the upper end of the positioning pin is closed by the nozzle. It can be pushed down to the plate 110 surface. Further, the positioning pins 22 are formed by using a cover 124 (see FIG. 3) or an adhesive.
0 is left in the positioning through hole 200 and the positioning hole 210 as it is. For this reason, the recording head 10
Since the positioning through holes 200 are filled with the positioning pins 220 on the nozzle forming surface (nozzle plate 110), there is no possibility that ink will accumulate there and stain recording paper and the like.

In this embodiment, the pin receiving portion 211 is
When the head case 119 is formed by resin molding, the head case 119 is formed integrally with the case main body.
Even if 11 is added, it is only necessary to partially deform the mold, and it is necessary to perform secondary processing such as crushing the lower end opening of the positioning hole 210 with a punch or the like to narrow the lower end opening of the positioning hole 210. Because there is no production cost does not increase. Further, when the head case 119 is formed from a thermosetting resin to form a hard head case 119, unlike the case where the head case 119 is formed of a thermoplastic resin, there is no toughness even when the lower end opening of the positioning hole 210 is crushed with a punch or the like. It is impossible to project a protrusion into the positioning hole 210 hole, but if the pin receiving portion 211 is formed integrally with the case body at the time of resin molding as in this embodiment,
Even when the head case 119 is formed from a thermosetting resin, the pin receiving portion 211 can be easily formed.

[Embodiment 2] FIGS. 7A and 7B
(C) is a cross-sectional view after the flow path unit and the head case are overlapped when manufacturing the recording head according to the second embodiment of the present invention, a cross-sectional view showing an enlarged main part thereof, and FIG. 4 is an explanatory diagram showing an enlarged bottom portion of a positioning hole formed in a head case.

Also in this embodiment, FIG. 3 and FIG.
As shown in (B), the nozzle plate 110, the flow path forming plate 112, and the elastic plate 1 constituting the flow path unit 118
The two positioning through holes 200 (20
0a, 200b, 200c), two positioning holes 210 are formed at positions overlapping the positioning through holes 200 in the flow path unit mounting surface 119a of the head case 119, and the head case 119 is formed. When the flow path unit 118 is positioned, the positioning pins 220 are inserted into the head case 119, and the positioning holes 200 of the flow path unit 118 are inserted into the positioning pins 220, so that the flow path unit 118 and the head case 119 are positioned. And positioning.

At the bottom of the positioning hole 210,
As shown in FIGS. 7B and 7C, the positioning pin 220
A pin receiving portion 211 for receiving the lower end of the pin is formed.
In this embodiment, three projections 213 projecting into the positioning holes 210 are formed as the pin receiving portions 211. These protrusions 213 (pin receiving portions 210) are used when the head case 119 is formed of a thermosetting resin.
This is a part formed integrally with the case body.

As described above, in manufacturing the recording head 10 according to the present embodiment as well, FIGS.
As shown in (C), the positioning pins 220 are inserted into the head case 119, and the positioning holes 200 of the flow path unit 118 are inserted into the positioning pins 220, thereby positioning the flow path unit 118 and the head case 119. At this time, the bottom of the positioning hole 210 is provided with a pin receiving portion 211 composed of three protrusions 213 projecting inward.
Therefore, the positioning pins 220 do not fall out of the positioning holes 210. Therefore, it is not necessary to hold the positioning pin 220 so that the positioning pin 220 does not fall off when the positioning hole 220 is inserted into the positioning pin 220 inserted into the positioning through hole 210. Work can be done.

In this embodiment, as shown in FIG. 8, after the alignment between the flow path unit 118 and the head case 119 is completed, the pin receiving portion is broken by pushing the positioning pin 220, and the upper end of the positioning pin is closed. Nozzle plate 110
It can be pushed down to the surface. Further, the cover 124
Alternatively, the positioning pins are left in the positioning through holes 200 and the positioning holes 210 by using an adhesive (see FIG. 3). For this reason, since the positioning through holes 200 are filled with the positioning pins 220 on the nozzle forming surface (nozzle plate 110) of the recording head 10, there is no possibility that ink will accumulate there and stain recording paper or the like. Further, since the pin receiving portion 211 is a portion formed integrally with the case main body when the head case 119 is molded with resin, the production cost does not increase.
In addition, the pin receiving portion 21 is integrally formed with the case body during resin molding.
If pin 1 is formed, pin receiving portion 211 can be easily formed even when head case 119 is formed of a thermosetting resin.

[Embodiment 3] FIGS. 9A and 9B
(C) is a cross-sectional view after the flow path unit and the head case are overlapped when manufacturing the recording head according to the second embodiment of the present invention, a cross-sectional view showing an enlarged main part thereof, and FIG. 4 is an explanatory diagram showing an enlarged bottom portion of a positioning hole formed in a head case.

Also in this embodiment, FIG. 3 and FIG.
As shown in (B), the nozzle plate 110, the flow path forming plate 112, and the elastic plate 1 constituting the flow path unit 118
The two positioning through holes 200 (20
0a, 200b, 200c), two positioning holes 210 are formed at positions overlapping the positioning through holes 200 in the flow path unit mounting surface 119a of the head case 119, and the head case 119 is formed. When the flow path unit 118 is positioned, the positioning pins 220 are inserted into the head case 119, and the positioning holes of the flow path unit 118 are inserted into the positioning pins 220. Position.

At the bottom of the positioning hole 210,
As shown in FIGS. 9B and 9C, the positioning pin 220
A pin receiving portion 211 for receiving the lower end of the pin is formed.
In this embodiment, a thin portion 214 is formed at the bottom of the positioning hole 210 as the pin receiving portion 211. The thin portion 214 (pin receiving portion 210) is a portion formed integrally with the case main body when the head case 119 is formed from a thermosetting resin.

As described above, in manufacturing the recording head 10 of the present embodiment, FIGS. 9A, 9B,
As shown in (C), when positioning pins 220 are inserted into positioning holes 210 from positioning through holes 200 to position flow path unit 118 and head case 119, the bottom of positioning holes 210 has a thin portion. The positioning pin 220 does not fall out of the positioning hole 210 because of the pin receiving portion 211 composed of 214. Therefore, when the positioning pin 220 is inserted into the positioning through hole 210, it is not necessary to hold the positioning pin 220 so that the positioning pin 220 does not fall off, so that the positioning operation can be performed without trouble. The same effects as those of the first and second embodiments can be obtained.

[0038]

As described above, in the recording head according to the present invention, a positioning pin is inserted into the positioning through-hole and the positioning pin is inserted into the positioning pin as a configuration for positioning the channel unit in the head case. When positioning the flow path unit and the head case by inserting the holes, the positioning pins do not fall out of the positioning holes because they are pin receiving portions at the bottom of the positioning holes. Therefore, even if a material having no toughness is used for the head case, there is no need for secondary processing using a punch or the like, so that the positioning operation can be performed without any trouble. Also, after the alignment between the flow path unit and the head case is completed, the positioning pins are kept in the positioning through holes and the positioning holes as they are. Therefore, since the positioning through holes are filled with the positioning pins on the nozzle forming surface (nozzle plate) of the recording head, ink does not accumulate there and does not stain recording media such as recording paper.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a main part of an ink jet recording apparatus to which the present invention is applied.

FIG. 2 is a sectional view of an actuator formed on a recording head of the ink jet recording apparatus shown in FIG.

FIG. 3 is an exploded perspective view of a recording head of the ink jet recording apparatus shown in FIG.

FIG. 4 is an explanatory view schematically showing the structure of each member constituting the recording head shown in FIG. 3;

FIGS. 5A, 5B, and 5C are cross-sectional views each showing a method of aligning a flow path unit and a head case when manufacturing the recording head according to the first embodiment of the present invention. FIG. 5 is an enlarged sectional view showing a method for aligning the flow path unit with the head case, and an explanatory view showing an enlarged bottom portion of a positioning hole formed in the head case.

FIGS. 6A and 6B are cross-sectional views of a flow path unit and a head case after the head case is overlapped when manufacturing the recording head according to the first embodiment of the present invention, and main parts thereof. It is sectional drawing which expands and shows.

FIGS. 7A, 7B, and 7C are cross-sectional views after a flow path unit and a head case are superimposed upon manufacturing a recording head according to Embodiment 2 of the present invention; FIG. 4 is an enlarged sectional view showing a main part thereof, and an enlarged explanatory view showing a bottom portion of a positioning hole formed in a head case.

FIGS. 8A and 8B are cross-sectional views after a positioning pin is pushed into a nozzle plate when manufacturing the recording head according to the first and second embodiments of the present invention, and the main parts thereof are enlarged. FIG.

FIGS. 9A, 9B, and 9C are cross-sectional views after a flow path unit and a head case are overlapped when manufacturing a recording head according to Embodiment 3 of the present invention; FIG. 4 is an enlarged sectional view showing a main part thereof, and an enlarged explanatory view showing a bottom portion of a positioning hole formed in a head case.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 inkjet recording apparatus 10 recording head 100 pressure generating element 110 nozzle plate 111 nozzle opening 112 flow path forming plate 113 pressure generating chamber 115 reservoir 116 elastic plate 116a stainless steel plate 116b resin film 116c island-shaped vibration region 118 flow path unit 119 head case 121 Window of head case 200 Positioning through hole 210 Positioning hole 220 Positioning pin 212 Small diameter portion 211 Pin receiving portion 213 Projection 214 Thin portion 220 Positioning pin

Claims (8)

[Claims] 1. A nozzle plate in which a plurality of nozzle openings are formed, a flow path forming plate in which a pressure generating chamber communicating with each of the nozzle openings is formed, and a vibration region overlapping each of the pressure generating chambers is an island. A flow path unit in which elastic plates formed in this order are laminated in this order, and a head case in which a plurality of pressure generating elements for vibrating the vibration region are supported are superimposed, and the pressure generating elements are In the ink jet recording heads respectively in contact with the vibration regions, at least two positioning through holes are formed in the flow path unit, and positioning holes overlapping with each of the positioning through holes are formed in the head case. A positioning pin is inserted into the overlapping positioning through-hole and the positioning hole, Serial to the bottom side of the positioning holes, the ink jet recording head, wherein the pin receiving portion for receiving the lower end of the positioning pin is formed. 2. An ink jet recording head according to claim 1, wherein said head case is formed by integrally molding a case main body and said pin receiving portion by injection molding. 3. The ink jet recording head according to claim 1, wherein the head case is formed by integrally molding a case main body and the pin receiving portion with a thermosetting resin. 4. An ink jet recording head according to claim 1, wherein said pin receiving portion is a small diameter portion in said positioning hole. 5. An ink jet recording head according to claim 1, wherein said pin receiving portion is a projection projecting into said positioning hole. 6. An ink jet recording head according to claim 1, wherein said pin receiving portion is a thin portion closing a bottom portion of said positioning hole. 7. A nozzle plate in which a plurality of nozzle openings are formed, a flow path forming plate in which a pressure generating chamber communicating with each of the nozzle openings is formed, and a vibration region overlapping each of the pressure generating chambers is in an island shape. A flow path unit in which elastic plates formed in this order are laminated in this order is superimposed on a head case in which a plurality of pressure generating elements for vibrating the vibration region are supported, and the pressure generating elements are formed of the elastic plate. In the method for manufacturing an ink jet recording head that abuts each of the vibration regions, the flow path unit has at least two positioning through holes.
On the other hand, in the head case, a positioning hole is formed at a position overlapping with the positioning through hole, and when the flow path unit is overlapped with the head case, the positioning hole is formed. A positioning pin is inserted into the through hole, the flow path unit is inserted into the positioning pin, and a lower end of the inserted positioning pin is supported by a pin receiving portion formed on the bottom side of the positioning hole. A method for manufacturing an ink jet recording head. 8. The method according to claim 7, wherein the upper end of the positioning pin is pushed to the surface of the nozzle plate after the positioning of the head case and the flow path unit is completed.