JP4483568B2 - Liquid jet head - Google Patents

Description

  The present invention relates to a liquid ejecting head such as an ink jet recording head, and more particularly to a liquid ejecting head including a nozzle forming member having a plurality of nozzle openings arranged in a row and capable of ejecting liquid as droplets from the nozzle openings.

  Examples of liquid ejecting heads that discharge liquid droplets from nozzle openings by causing pressure fluctuations in the pressure chambers include, for example, ink jet recording heads used in image recording apparatuses such as printers, and manufacture of color filters such as liquid crystal displays. Material injection heads used in manufacturing, electrode material injection heads used for electrode formation of organic EL (Electro Luminescence) displays, FEDs (surface emitting displays), etc., and bioorganic matter injection heads used in the manufacture of biochips (biochemical elements) Etc.

  There are various types of such liquid ejecting heads. For example, an ink jet recording head (hereinafter referred to as a recording head) in an ink jet recording apparatus (hereinafter simply referred to as a printer) has a nozzle opening from a reservoir through a pressure chamber. A head unit (head body) including a flow path unit in which a series of liquid flow paths leading to the pressure chamber, an actuator unit having a pressure generating element capable of changing the volume of the pressure chamber, and the like, and a plurality of fluid channels communicating with the liquid flow path Some include a metal nozzle plate having a nozzle row in which nozzle openings are arranged, and a resin head case to which the head unit and the nozzle plate (a kind of nozzle forming member) are fixed.

  In such a recording head, depending on a state around the nozzle opening, that is, a wet state of a liquid such as ink around the nozzle opening, a flying bend may occur in the ejected liquid droplets. In other words, when the periphery of the nozzle opening is wet with a liquid such as ink, the droplet at the time of ejection is pulled by the surface tension of this portion, and as a result, flight bending occurs. In order to prevent such flight bending, it is common to apply a liquid repellent treatment on the liquid droplet ejection surface of the nozzle plate to eliminate adhesion of liquid such as ink around the nozzle opening. .

  The nozzle plate in the recording head is fixed to the head case by a metal head cover in which an exposure window portion capable of exposing the nozzle opening of the nozzle plate is opened. The head cover functions to protect the head unit and the nozzle plate and prevent peeling of each part. Further, the head cover is set to a ground potential, and static electricity generated from the recording paper or the like is discharged from the nozzle plate by contacting the nozzle plate and conducting. This prevents, for example, problems such as electrostatic breakdown of the drive circuit due to the static electricity being transmitted through the nozzle plate and malfunction due to the static electricity being superimposed on the drive signal as noise (for example, , See Patent Document 1).

JP 2004-74676 A

  By the way, in recent years, this type of printer has a tendency to use pigment-based ink to improve image quality and water-resistant ink to improve water resistance. As a solvent for such an ink, a resin-based dispersant is used with respect to conventional water. Therefore, the liquid repellent coating layer formed on the droplet ejection surface of the nozzle plate to prevent ejection defects such as flying bends caused by the ink adhering to the periphery of the nozzle opening also has liquid repellency corresponding to the above inks. Higher ones are needed. Therefore, in order to reduce costs by simplifying the coating process, in addition to significantly improving the liquid repellency and quality, the liquid droplet ejection surface of the nozzle plate is subjected to a liquid repellency process using, for example, a thin film deposition technique. It is becoming. By this liquid repellent treatment, a liquid repellent coating layer containing, for example, more fluorine resin than the conventional one is formed on the droplet discharge surface of the nozzle plate. However, since the fluororesin has a high insulating property, if the content of the fluororesin is increased in order to improve the liquid repellency, the insulating property of the droplet discharge surface of the nozzle plate is increased accordingly. For this reason, there is a problem in that it is difficult to ensure conduction between the nozzle plate and the head cover in the configuration in which the head cover is simply superimposed on the liquid droplet ejection surface of the nozzle plate as in Patent Document 1 described above.

  The present invention has been made in view of such circumstances, and the object thereof is to ensure electrical continuity between the nozzle forming member and the head cover even when the liquid repellency of the droplet discharge surface of the nozzle forming member is improved. It is an object of the present invention to provide a liquid ejecting head that can perform the above-described operation.

In order to achieve the above object, the liquid jet head according to the present invention has a plurality of nozzle openings arranged in a row, and a liquid repellent coating layer made of an insulating material is formed on a metal substrate on a droplet discharge surface on the droplet discharge side. A nozzle forming member,
A head body including a pressure generating element that discharges the liquid in the pressure chamber communicating with the nozzle opening as droplets from the nozzle opening;
A head case to which the nozzle forming member and the head body are fixed;
A metal head cover provided on the droplet discharge surface side of the head body so as to overlap a part of the droplet discharge surface ;
The head cover has a contact protrusion that protrudes from the frame portion overlapping the droplet discharge surface toward the droplet discharge surface side of the nozzle forming member,
The contact protrusion protrudes through the liquid repellent coating layer and abuts against a metal substrate portion of a droplet discharge surface of a nozzle forming member in a state where the head cover is attached to the head case.
The “metal substrate” in the present invention has conductivity and constitutes the droplet discharge surface side of the nozzle forming member.

According to the above configuration, when the head cover is attached to the head case , the contact protrusion protrudes through the liquid-repellent coating layer due to the high surface pressure applied to the frame portion, and the metal base portion of the droplet discharge surface of the nozzle forming member Therefore, the nozzle forming member and the head cover can be made conductive even when the liquid repellent coating layer formed on the droplet discharge surface of the nozzle forming member has high insulation. Therefore, even if the liquid repellency of the droplet discharge surface of the nozzle forming member is improved, the nozzle forming member can be adjusted to the ground potential via the head cover. For this reason, it is possible to prevent problems such as electrostatic breakdown and malfunction of the drive circuit due to static electricity.

In the above-described configuration, the frame portion is provided with an exposed window portion that can expose the nozzle opening in a mounted state on the nozzle forming member, and the contact protrusion is provided on an inner peripheral edge of the exposed window portion. It is desirable.
According to this configuration, since the contact protrusion is provided on the inner peripheral edge of the exposed window portion, a high surface pressure applied to the frame portion in the head cover attached state also applies a force to the contact protrusion on the liquid droplet ejection surface side, Even when a liquid repellent coating layer or the like is present on the liquid droplet ejection surface, the liquid repellent coating layer can be surely contacted with the metal substrate portion of the liquid droplet ejection surface. Therefore, even when the water repellency of the droplet discharge surface of the nozzle forming member is increased, the conduction between the nozzle forming member and the head cover can be ensured more reliably.
Further, according to this configuration, since the gap between the exposed window portion and the nozzle forming surface can be closed by the contact protrusion, it is possible to prevent a problem that a recording medium such as a recording sheet is sandwiched in the gap. .

Further, in the above configuration, the frame portion is provided with a positioning hole through which a positioning pin protruding from the head case is inserted, and the contact protrusion is provided on an inner peripheral edge of the positioning hole. desirable.
According to this configuration, since the contact protrusion is provided on the inner peripheral edge of the positioning hole, the contact protrusion and the droplet discharge surface side are also pressed by the surface pressure applied to the frame portion and the pressing from the positioning pin when the head cover is attached. Even when a liquid repellent coating layer is present on the droplet discharge surface, contact protrusions can penetrate the liquid repellent coating layer and contact the metal substrate portion of the droplet discharge surface reliably. it can. Therefore, electrical conduction between the nozzle forming member and the head cover can be ensured more reliably.

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

  First, a schematic configuration of the printer will be described with reference to FIG. The printer 1 is an apparatus that records an image or the like by ejecting liquid ink onto the surface of a recording medium 2 (ejection target) such as recording paper. The printer 1 includes an ink jet recording head 3 that discharges ink (corresponding to a kind of liquid ejecting head of the present invention; hereinafter referred to as a recording head), a carriage 4 to which the recording head 3 is attached, and the carriage 4 in the main scanning direction. A carriage moving mechanism 5 for moving the recording medium 2 and a platen roller 6 for transferring the recording medium 2 in the sub-scanning direction. Here, the above-described ink is a kind of liquid of the present invention, and is stored in the ink cartridge 7. The ink cartridge 7 is detachably attached to the recording head 3.

  The carriage moving mechanism 5 includes a timing belt 8, which is driven by a pulse motor 9 such as a DC motor. Therefore, when the pulse motor 9 is operated, the carriage 4 is guided by the guide rod 10 installed on the printer 1 and reciprocates in the main scanning direction (width direction of the recording medium 2).

  2 and 3 are diagrams for explaining the configuration of the recording head 3. FIG. 2 is an exploded perspective view of the recording head 3 viewed from obliquely above, and FIG. 3 is an exploded perspective view of the recording head 3 viewed from obliquely below. FIG. The recording head 3 includes a supply needle unit 12 provided with a plurality of ink supply needles 11 for introducing the ink in the ink cartridge 7 into the head 3, and head constituent members such as an actuator unit 13 and a flow path unit 14. The head case 18 includes a head unit 15 (corresponding to a head body in the present invention) having a nozzle plate 17 (a type of nozzle forming member in the present invention) having a nozzle row 16 in which a plurality of nozzle openings are arranged in a row. It is roughly composed. In the recording head 3, a head cover 19 for protecting the side portions of the head unit 15 and the nozzle plate 17 and adjusting the nozzle plate 17 to the ground potential is attached to the front end side of the head case 18. It has become.

  The head case 18 has a base portion 21 to which the supply needle unit 12 and the wiring board 20 are attached, and a hollow box-like shape that extends downward from the bottom portion of the base portion 21 and has the head unit 15 attached to the opening surface. It is a member constituted by the case portion 22. As a material of the head case 18 and the supply needle unit 12, for example, an epoxy synthetic resin or the like is used.

  The base portion 21 of the head case 18 is partitioned with a substrate disposing portion 23 where the wiring substrate 20 is disposed. The wiring board 20 is a board on which electronic components for various drive signals are mounted and a connection terminal to which one end side terminal of the flexible cable 24 of the actuator unit 13 is connected is formed. The wiring board 20 includes a connector 25, and a control cable (not shown) such as an FFC (flexible flat cable) from the control device is electrically connected to the connector 25. It has become.

  The head unit 15 is composed of an actuator unit 13 and a flow path unit 14, which are integrated in a state where they are overlapped. The actuator unit 13 includes a pressure chamber plate in which a pressure chamber corresponding to a nozzle opening is formed, a communication port plate in which a communication port is formed, and a vibrator plate on which a piezoelectric vibrator is mounted. A flexible cable 24 such as a tape carrier package is provided with the other end side terminal electrically connected to the terminal portion of the piezoelectric vibrator. The piezoelectric vibrator in the actuator unit 13 is a so-called flexural vibration mode piezoelectric vibrator. When the piezoelectric vibrator is driven, that is, flexurally vibrated, the volume of the pressure chamber changes, and an ink droplet (liquid A kind of droplet) is discharged.

  The flow path unit 14 includes a supply port plate 32 that forms an ink supply port 30 and a compliance portion 31 that relieves pressure fluctuations of the reservoir, and a plurality of reservoirs 33 that are supplied with ink introduced from the ink cartridge side. The reservoir plate 34 is formed. The supply port plate 32 and the reservoir plate 34 are bonded together by a heat welding film or the like in a stacked state, and form an ink flow path from the reservoir 33 to the nozzle opening. The nozzle plate 17 is joined to the surface of the reservoir plate 34 opposite to the joint surface of the supply port plate 32, that is, the bottom surface of the head unit 15.

As the material of the nozzle plate 17, a conductive material, for example, a large material substrate such as stainless steel is used. Then, after opening the nozzle openings on this material substrate and applying a liquid repellent treatment to one surface (the droplet ejection surface on the ink droplet ejection side), a plurality of nozzle plates 17 are cut out from this material substrate. . Therefore, the liquid repellent coating layer 35 is formed only on the droplet discharge surface of the nozzle plate 17.
In addition, although the nozzle formation member in this embodiment illustrated the nozzle plate 17 comprised from metal substrates (a kind of raw material board | substrate), such as stainless steel, not only this but at least the droplet discharge surface side has electroconductivity. Any material may be used as long as it is composed of a metal substrate.

  The liquid repellent coating layer 35 is applied to the droplet discharge surface of the nozzle plate 17 in a state in which a fluororesin is contained using a thin film deposition technique. Thereby, in addition to drastically improving the liquid repellency and improving the durability, the cost can be reduced by simplifying the liquid repellent coating process.

  In order to position these on the head case 18, the supply port plate 32, the reservoir plate 34, the nozzle plate 17, and the frame portion 40 of the head cover 19 that is attached to the nozzle plate 17 are attached to the flow path unit 14. Positioning holes 42 that can be inserted into the positioning pins 41 are provided at two positions at positions corresponding to the positioning pins 41. The head unit 15 and the nozzle plate 17 are fixed to the head case 18 in a posture in which the nozzle plate 17 faces downward after the positioning pins 41 are inserted into the positioning holes 42 so that the relative positions thereof are matched. Is done. Further, the head cover 19 is attached to the distal end side of the head case 18 so as to surround the head unit 15 and the nozzle plate 17 from the outside after being inserted through the positioning pins 41 and aligned.

  Next, the head cover 19 will be described. 4A and 4B are diagrams for explaining the configuration of the head cover 19, wherein FIG. 4A is a perspective view of the head cover 19, and FIG. 4B is a plan view of the head cover 19. FIG. As with the nozzle plate 17, the head cover 19 is made of a conductive metal plate such as stainless steel, and has a frame-like frame portion 40 having an exposed window portion 43 opened at the center portion thereof. A side wall 44 extending from the outer peripheral edge of the frame 40 toward the head case 18 is schematically configured. The side wall portions 44 (see FIG. 5) on both sides in the nozzle row orthogonal direction extend to the side portions 44 in the form of ear pieces. A fastening hole 47 through which a fastening pin 46 for attachment to the housing is inserted is formed. The side wall 44 is connected to an earth line (not shown) leading to the printer 1 side. Thereby, the head cover 19 is configured to be adjusted to the ground potential.

  The exposed window portion 43 of the head cover 19 has a window frame shape opened so as to expose the nozzle row 16, and the size (inner size) is set to be smaller than the nozzle plate 17. Therefore, when the head cover 19 is attached to the head case 18, the nozzle plate 17 is exposed from the exposure window 43 in a state where it overlaps with a part of the frame portion 40 of the head cover 19.

  The frame portion 40 is formed in a substantially rectangular frame shape, and a contact protrusion 48 that protrudes from the frame portion 40 toward the droplet discharge surface side of the nozzle plate 17 is provided. The contact protrusions 48 come into contact with the metal substrate portion of the droplet discharge surface of the nozzle plate 17 in a state where the head cover 19 is attached to the head case 18.

  A first embodiment of the contact protrusion 48 will be described. The contact protrusion 48 a in the present embodiment is provided on the inner peripheral edge of the exposed window 43 of the head cover 19. FIG. 5 is a diagram showing the recording head 3 with the head cover 19 attached to the head case 18, and FIG. 6A is a cross-sectional view taken along line AA in FIG. 5.

  As shown in FIG. 6A, the contact protrusion 48 a of the present embodiment is a protrusion whose tip protrudes from the back surface of the frame portion 40 in contact with the nozzle plate 17 to the liquid discharge surface side. It is provided all around the inner periphery. Specifically, the sharp tip of the contact protrusion 48a protrudes from the back surface side of the frame part 40 toward the nozzle plate 17, for example, by 20 μm. That is, L1 = 20 μm in the figure. Further, in the state where the head cover 19 is attached to the head case 18, the surface pressure applied to the fastening part 45 when the fastening pin 46 is attached is transmitted to the frame part 40 through the side wall part 44. A force is applied to press the nozzle plate 17 toward the droplet discharge surface. As a result, even when the highly repellent liquid repellent coating layer 35 exists on the droplet discharge surface of the nozzle plate 17, the contact protrusion 48 a penetrates the liquid repellent coating layer 35 to the metal base portion of the nozzle plate 17. Abut. Therefore, conduction can be more reliably ensured by the contact protrusion 48a. Thereby, the nozzle plate 17 can be adjusted to the ground potential via the head cover 19. For this reason, even if the liquid repellent coating layer 35 having high liquid repellency is formed on the droplet discharge surface of the nozzle plate 17, problems such as electrostatic breakdown and malfunction of the drive circuit due to static electricity can be prevented.

  Further, according to the present embodiment, the contact protrusion 48a is provided over the entire inner periphery of the exposed window 43 of the head cover 19, so that the contact protrusion 48a provides a gap between the head cover 19 and the nozzle plate 17. Can be closed. Accordingly, for example, a mist of minute ink droplets ejected from the nozzle opening can be prevented from entering the inside of the head cover 19 from the exposed window 43 of the head cover 19. Further, it is possible to prevent a problem that a recording medium such as recording paper is sandwiched in the gap between the head cover 19 and the nozzle plate 17.

  The contact protrusion 48a may be formed by using a burr generated by press working when the exposed window portion 43 is formed. In this way, the direction in which the burr and the contact protrusion 48a protrude can be made the same, so that the contact protrusion 48a can be easily formed without adding a new processing step.

  Next, a second embodiment of the contact protrusion 48 will be described. The contact protrusion 48b in this embodiment is provided on the inner peripheral edge of the positioning hole 42a of the head cover 19. FIG. 6B is a cross-sectional view taken along the line BB in the drawing showing the recording head 3 of FIG.

  As shown in FIG. 6B, the contact protrusion 48b of the present embodiment is a protrusion whose tip protrudes from the inner peripheral edge of the positioning hole 42a formed in the frame portion 40 toward the liquid ejection surface of the nozzle plate 17. Yes, provided on the entire inner periphery of the positioning hole 42a. Specifically, the ring-shaped tip of the contact protrusion 48 b protrudes, for example, 20 μm from the back surface side of the frame portion 40 toward the nozzle plate 17. That is, L2 = 20 μm in the figure. Further, in the state where the head cover 19 is attached to the head case 18, the surface pressure applied to the fastening portion 45 when the fastening pin 46 is attached is transmitted through the side wall portion 44 and is also applied to the frame portion 40, in addition to the positioning pin. Since the pressing force applied by the caulking 41 is also applied to the periphery of the positioning hole 42a, a force is applied to the contact projection 48b toward the droplet discharge surface of the nozzle plate 17. As a result, even when the highly repellent liquid repellent coating layer 35 exists on the droplet discharge surface of the nozzle plate 17, the contact protrusion 48 b penetrates the liquid repellent coating layer 35 to the metal base portion of the nozzle plate 17. Contact can be ensured more reliably. Therefore, the nozzle plate 17 can be adjusted to the ground potential via the head cover 19. For this reason, even if the liquid repellent coating layer 35 having high liquid repellency is formed on the liquid droplet ejection surface of the nozzle plate 17, it is possible to prevent problems such as electrostatic breakdown and malfunction of the drive circuit due to static electricity.

  Further, according to the present embodiment, the contact protrusion 48b is provided on the inner peripheral edge of the positioning hole 42a of the head cover 19, so that when the head cover 19 is attached to the head case 18, as described above, the droplet discharge surface Force is applied in the direction. As a result, the contact protrusion 48b bites into the nozzle plate 17, and the head cover 19 is unlikely to be displaced. Therefore, when the head cover 19 is attached, it is possible to maintain the positional accuracy that is adjusted by inserting the positioning pin 41 after the attachment.

  The contact protrusion 48b in the present embodiment may be formed using a burr or a bulging portion generated by punching when forming the positioning hole 42a. For example, as shown in FIG. 7A, after a through hole (positioning hole 42a) is formed in the head cover 19, a pointed punch 50a is pushed into the through hole so that the shape follows the punch 50a. It is also possible to form the contact protrusion 48b.

  Further, as shown in FIG. 7B, for example, when a die of the contact protrusion 48b is formed in advance on the die 49 side used for punching and a through hole (positioning hole 42a) is opened by this punching, a punch is formed. It is also possible to form the positioning hole 42a and the contact protrusion 48b at the same time while making the bulging portion pushed out by 50b follow the shape of the die 49.

  The contact protrusions 48 may be provided on both the inner peripheral edge of the exposed window 43 of the head cover 19 and the inner peripheral edge of the positioning hole 42a.

  By the way, the present invention is not limited to the above embodiment, and various modifications can be made based on the description of the scope of claims. For example, the contact protrusion 48 may be brought into contact with the liquid repellent coating layer 35 previously removed by ultraviolet irradiation or the like in a region in contact with the contact protrusion 48 on the droplet discharge surface of the nozzle plate 17. In this case, the contact protrusion 48 can be reliably brought into contact with the metal base portion of the liquid ejection surface of the nozzle plate 25 regardless of the surface pressure applied to the frame portion or the pressing from the positioning pin in the head cover attached state. .

  Moreover, regarding the contact protrusion 48, in the said embodiment, although two examples provided in the perimeter of the inner periphery of the flame | frame part 40 were shown, it is not restricted to this. For example, the contact protrusion 48 can be provided on at least a part of the inner peripheral edge of the frame portion 40. At this time, the contact protrusion 48 can have any shape as long as electrical connection is ensured between the contact protrusion 48 and the droplet discharge surface of the nozzle plate 17.

  In the above, the ink jet recording head 3 which is a kind of liquid ejecting head has been described as an example, but the present invention can also be applied to other liquid ejecting heads. For example, a color material ejecting head used for manufacturing a color filter such as a liquid crystal display, an electrode material ejecting head used for forming an electrode such as an organic EL (Electro Luminescence) display, an FED (surface emitting display), a biochip (biochemical element) The present invention can also be applied to bioorganic matter ejecting heads and the like used in the production of

FIG. 2 is a perspective view illustrating a configuration of a printer. FIG. 3 is an exploded perspective view of the configuration of the recording head as viewed obliquely from above. FIG. 3 is an exploded perspective view of the configuration of the recording head as viewed obliquely from below. It is a figure explaining the structure of a head cover, (a) is a perspective view, (b) is a top view. FIG. 3 is a diagram illustrating a recording head in a state where a head cover is attached to a head case. (A) is the sectional view on the AA line in FIG. 5, (b) is the sectional view on the BB line in FIG. (A) And (b) is a figure explaining the processing method of the positioning hole and contact protrusion in 2nd Embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Printer, 2 ... Recording medium, 3 ... Recording head, 4 ... Carriage, 5 ... Carriage moving mechanism, 6 ... Platen roller, 7 ... Ink cartridge, 8 ... Timing belt, 9 ... Pulse motor, 10 ... Guide rod, 11 DESCRIPTION OF SYMBOLS Ink supply needle, 12 ... Supply needle unit, 13 ... Actuator unit, 14 ... Flow path unit, 15 ... Head unit, 16 ... Nozzle row, 17 ... Nozzle plate, 18 ... Head case, 19 ... Head cover, 20 ... Wiring board , 21 ... base part, 22 ... case part, 23 ... substrate placement part, 24 ... flexible cable, 25 ... connector, 30 ... ink supply port, 31 ... compliance part, 32 ... supply port plate, 33 ... reservoir, 34 ... Reservoir plate, 35 ... Liquid repellent coating layer, 40 ... Frame part, 41 ... Positioning pin, 42 ... Positioning Hole, 43 ... exposing window portion, 44 ... side wall, 45 ... fastening section, 46 ... fastening pin, 47 ... fastening hole, 48 ... contact protrusion, 49 ... die, 50 ... punch

Claims (3)

A nozzle forming member in which a plurality of nozzle openings are arranged, and a liquid-repellent coating layer made of an insulating material is formed on a metal substrate on a droplet discharge surface on the droplet discharge side;
A head body including a pressure generating element that discharges the liquid in the pressure chamber communicating with the nozzle opening as droplets from the nozzle opening;
A head case to which the nozzle forming member and the head body are fixed;
A metal head cover provided on the droplet discharge surface side of the head body so as to overlap a part of the droplet discharge surface ;
The head cover has a contact protrusion that protrudes from the frame portion overlapping the droplet discharge surface toward the droplet discharge surface side of the nozzle forming member,
The contact protrusion protrudes through the liquid repellent coating layer and abuts against a metal substrate portion of a droplet discharge surface of a nozzle forming member in a state where the head cover is attached to the head case. head. The frame portion is provided with an exposure window portion capable of exposing the nozzle opening in a mounting state on the nozzle forming member.
The liquid ejecting head according to claim 1, wherein the contact protrusion is provided on an inner peripheral edge of the exposed window portion. The frame portion is provided with a positioning hole through which a positioning pin protruding from the head case is inserted,
The liquid ejecting head according to claim 1, wherein the contact protrusion is provided on an inner peripheral edge of the positioning hole.

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