JP2009039894A - Liquid jetting head - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a liquid jetting heat having improved durability by protecting a nozzle plate and also eliminating static electricity. <P>SOLUTION: A recording head 3 discharging liquid drops from a nozzle opening 26 is constituted of: a vibrator unit 22 equipped with a piezoelectric vibrator 29 applying pressure variation; a channel unit 17 comprising the nozzle plate 25 where a plurality of nozzle openings 26 are made open and a channel forming substrate 24 where a pressure generating chamber 35 communicating with the nozzle openings 26 is formed; and a head case 16 holding the vibrator unit 22 and the channel unit 27. A side fitting 27 is fixed on the side surface of the head case 16 in a state where it extends toward the edge side of the nozzle opening 26 of the channel unit 17 and its edge part 28 is at least flush with or projecting from the surface 38 of the nozzle plate 25. <P>COPYRIGHT: (C)2009,JPO&INPIT

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 that discharges liquid droplets from a nozzle by applying a pressure fluctuation to a pressure generating chamber communicating with a nozzle.

Examples of liquid ejecting heads that eject (eject) liquid droplets from nozzle openings (a type of nozzle) by causing pressure fluctuations in the liquid in the pressure generating chamber include, for example, ink jet recording apparatuses (hereinafter simply referred to as printers). Inkjet recording heads used in image recording apparatuses (hereinafter simply referred to as recording heads), color material ejection heads used in the manufacture of color filters such as liquid crystal displays, and organic EL (Electro
There are electrode material ejecting heads used for forming electrodes such as Luminescence displays and FEDs (surface emitting displays), and bioorganic matter ejecting heads used for manufacturing biochips (biochemical elements).

  For example, in the recording head described above, a flow path unit in which a series of liquid flow paths from the reservoir to the nozzle through the pressure generation chamber are formed, or an actuator unit having a pressure generation element capable of changing the volume of the pressure generation chamber is used as a resin. It is configured to be attached to a head case made of metal. The flow path unit includes a metal nozzle plate (a kind of nozzle forming member) having nozzles.

  The nozzle plate in such a recording head is fixed to the head case in a state where it is protected by a metal head cover having an exposed window portion that can expose the nozzle opening of the nozzle plate. 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 a recording paper or the like is discharged from the nozzle plate by being brought into contact with the nozzle plate and conducting. This prevents problems such as damage (electrostatic breakdown) of the drive circuit and the like due to 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, refer to Patent Document 1).

JP 2004-74676 A

  A recording head having such a configuration has a level difference caused by a difference in height between the head cover and the nozzle plate when the wiper performs a cleaning operation for wiping off liquid adhered to the surface of the nozzle plate. By sliding, the tip of the wiper may be worn or damaged. Further, since the head cover covers the edge of the nozzle plate, the surface on which the nozzle plate is exposed, that is, the area for opening the nozzle openings in the nozzle plate may be reduced.

  SUMMARY An advantage of some aspects of the invention is that it provides a liquid jet head with improved durability by protecting a nozzle plate and discharging static electricity.

In order to achieve the above object, a liquid jet head of the present invention is a liquid jet head that discharges droplets from a nozzle,
An actuator unit having a pressure generating element for giving pressure fluctuation;
A flow path unit comprising a nozzle forming member having a plurality of nozzles opened and a flow path forming substrate in which a pressure generating chamber communicating with the nozzle is formed;
A head case that holds the actuator unit and the flow path unit;
A metal is fixed to the side surface of the head case in a state of extending toward the nozzle tip side of the flow path unit and having the tip part at least protruding from the tip side surface of the nozzle forming member. Features.

  According to the above configuration, the metal is fixed to the side surface of the head case in a state that extends toward the nozzle tip side of the flow path unit and the tip part is at least the same or protrudes from the tip side surface of the nozzle forming member. Therefore, when an ejection target (ejecting target) such as recording paper is charged, it is discharged to a metal fitting that is closest to the ejection target. For this reason, by setting the metal to the ground potential, it is possible to prevent problems such as damage to the drive circuit due to static electricity and malfunction due to the static electricity being superimposed on the drive signal as noise. In addition, since the metal fitting covers the side surface of the flow path unit, the side surface of the flow path unit is protected during the wiping operation with a wiper blade for wiping off liquid adhering to the surface of the nozzle forming member. In addition, the nozzle forming member can be prevented from peeling off. Furthermore, the rigidity of the head case can be increased by metal, and as a result, crosstalk can be suppressed and swelling due to moisture absorption can also be suppressed. Therefore, the reliability of the liquid ejecting head can be improved.

  In the above configuration, it is desirable that the nozzle forming member and the metal are electrically connected.

  According to the above configuration, since the nozzle forming member and the metal are electrically connected, even if static electricity falls on the nozzle forming member, the static electricity is conducted to the metal side and the static electricity is grounded by grounding the metal. It is possible to surely remove static electricity.

  In the above configuration, the metal is preferably fixed to a side surface of the case along a nozzle row direction in which a plurality of nozzles are arranged.

  According to the above configuration, since the metal is fixed to the side surface of the case along the nozzle row direction in which a plurality of nozzles are arranged, a wiper blade or the like for wiping off liquid adhered to the surface of the nozzle forming member or the like During the wiping operation, the side surfaces of the flow path forming substrate and the nozzle forming member are protected against the relative sliding of the wiper blade to prevent the separation of each part and at the same time in the nozzle row direction of the nozzle forming member. Since both intersecting edges can be exposed, the degree of freedom of the nozzle opening area is expanded.

  In the above configuration, the metal is preferably fixed to a case side surface in a direction orthogonal to a nozzle row direction in which a plurality of nozzles are arranged.

  According to the above configuration, since the metal is fixed to the case side surface in a direction orthogonal to the nozzle row direction in which a plurality of nozzles are arranged, for example, when the head case has a rectangular shape that is long in the nozzle row direction, A metal having a smaller width than that in the case where metal is arranged on the side surface of the head case in the nozzle row direction is sufficient. Therefore, the metal can be reduced in size, and the liquid jet head can be reduced in weight. Therefore, the inertial force is small and advantageous when reciprocating scanning is performed at high speed.

The said structure WHEREIN: It is desirable for the said metal to be fixed to the case side surface which cross | intersects a wiping direction.
The wiping direction is a direction in which the surface of the nozzle forming member is wiped by relative sliding of a wiper blade or the like.

  According to the above configuration, since the metal is fixed to the side surface of the case that intersects the wiping direction, the flow path forming substrate and the nozzle forming member are not affected by relative sliding of the wiper blade during wiping. The side surfaces can be protected and peeling of each part can be prevented.

  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. In this embodiment, an ink jet recording head (hereinafter referred to as “recording head”) will be described as an example of the liquid ejecting head.

  FIG. 1 is a perspective view of an ink jet recording apparatus. First, a schematic configuration of an ink jet recording apparatus (hereinafter referred to as a printer) equipped with a recording head will be described with reference to FIG. The illustrated printer 1 is an apparatus that records an image or the like by ejecting liquid ink onto the surface of a recording medium (ejection target) 2 such as recording paper. This printer 1 includes a recording head 3 (corresponding to one type of liquid ejecting head in the present invention) for ejecting (ejecting) ink, a carriage 4 to which the recording head 3 is attached, and a carriage 4 in the main scanning direction (see FIG. 1). A carriage moving mechanism 5 for moving the recording medium 2 in the direction of arrow X and a platen roller 6 for transferring the recording medium 2 in the sub-scanning direction (a direction perpendicular to the main scanning direction; indicated by arrow Y in FIG. 1) are provided. Here, the 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. The timing belt 8 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 X (width direction of the recording paper 2).

  A cap member 11 and a wiper blade 12 adjacent to the cap member 11 are disposed at a home position which is a non-recording area of the printer 1. The cap member 11 is formed in a tray shape and abuts on a surface 38 (corresponding to a kind of tip side surface in the present invention) of a later-described nozzle plate 25 (corresponding to a kind of nozzle forming member in the present invention) of the recording head 3. . The space in the cap member 11 functions as a sealing void (not shown), and the nozzle opening 26 (see FIG. 2 corresponding to a kind of nozzle in the present invention) of the recording head 3 is exposed in this sealing void. In this state, the nozzle plate 25 can be brought into close contact with the surface 38 of the nozzle plate 25. A pump unit 13 is connected to the cap member 11, and the operation of the pump unit 13 can create a negative pressure in the sealed space. When the pump unit 13 is operated in close contact with the surface 38 of the nozzle plate 25 and negative pressure is generated in the sealed space (sealed space), ink and bubbles in the recording head 3 are sucked from the nozzle openings 26. The cap member 11 is then discharged into the sealed space. That is, the capping mechanism 12 is configured to perform an operation for forcibly sucking and discharging ink and bubbles in the recording head 3 (hereinafter referred to as a cleaning operation).

  When the recording head 3 passes, the wiper blade 12 wipes (wipes) a surface 38 of a nozzle plate 25 described later. The wiper blade 12 is made of an elastic body such as rubber, and extends along the arrow Y. The wiper blade 12 slides on the surface 38 of the nozzle plate 25 in response to the movement of the carriage 4 in the main scanning direction X, thereby wiping off waste ink and the like attached to the surface 38. Details of the wiping operation will be described later.

  Next, the configuration of the recording head 3 will be described. Here, FIG. 2 is an exploded perspective view of the recording head 3 attached to the carriage 4, and FIG. The illustrated recording head 3 includes a cartridge base 15 (hereinafter referred to as “base”), a head case 16, a flow path unit 17, a vibrator unit 22 (corresponding to a kind of actuator unit in the present invention), and the like. It is roughly structured.

  The base 15 is formed of, for example, a synthetic resin, and an ink introduction needle 19 is attached to the upper surface of the base 15 with a filter 18 interposed as shown in FIG. The ink cartridge 7 is attached to the ink introduction needle 19 attached to the base 15.

  As shown in FIG. 3, a circuit board 20 is attached to the other surface of the base 15 opposite to the upper surface to which the ink introduction needle 19 is attached. The circuit board 20 includes, for example, a drive circuit for controlling supply of a drive signal to a piezoelectric vibrator 29 described later, a connector for connection to the printer body side, a through hole for supplying ink, and the like. . And this circuit board 20 is attached to the base 15 via the joint 21 which functions as packing.

  The head case 16 is a casing that is fixed under the base 15 and accommodates a vibrator unit 22 having a piezoelectric vibrator 29 described later. For this reason, in the head case 16, an accommodation space 32 that can accommodate the transducer unit 22 is formed. The vibrator unit 22 is inserted into the housing space 32 and fixed by adhesion or the like. And the flow path unit 17 is being fixed to the front end surface on the opposite side to the attachment surface of the base 15 of the head case 16 with the adhesive agent.

  The flow path unit 17 is manufactured by joining and integrating with an adhesive etc. in the state which laminated | stacked the elastic board 23, the flow path formation board | substrate 24, and the nozzle plate 25. FIG.

  The nozzle plate 25 is a nozzle forming member according to the present invention, and is made of, for example, a thin plate made of stainless steel, and fine nozzle openings 26 are formed in a row at a pitch corresponding to the dot formation density of the printer 1 (FIG. 2). The direction of this nozzle row is indicated by an arrow K). The arrow K is parallel to the arrow Y indicating the sub-scanning direction described above.

  As shown in FIG. 2, the vibrator unit 22 includes a piezoelectric vibrator group 30, a fixing plate 31 to which each piezoelectric vibrator group 30 is joined, and a drive signal from the circuit board 20 to the piezoelectric vibrator group 30. It is composed of a flexible cable (FC) for supplying power. The piezoelectric vibrator group 30 of the present embodiment includes a plurality of piezoelectric vibrators 29 (corresponding to a kind of pressure generating element in the present invention) arranged in a comb-teeth shape. Each piezoelectric vibrator 29 has a fixed end joined on the fixed plate 31, and a free end protruding outside the front end surface of the fixed plate 31. That is, each piezoelectric vibrator 29 is mounted on the fixed plate 31 in a so-called cantilever state. The fixing plate 31 that supports each piezoelectric vibrator 29 is made of, for example, stainless steel having a thickness of about 1 mm. In addition to the piezoelectric vibrator, an electrostatic actuator, a magnetostrictive element, a heating element, or the like can be used as the pressure generating unit.

  Inside the head case 16, an accommodation empty portion 32 that can accommodate the vibrator unit 22 is formed in a state where the height direction of the head case 16 is penetrated. The vibrator unit 22 is housed and fixed in the housing space 32 by bonding the back surface of the fixing plate 31 to the inner wall surface of the case that defines the housing space 32.

  A plurality of flow path forming substrates 24 correspond to the respective nozzle openings 26 in a state in which empty portions that become common ink chambers 33, groove portions that become ink supply ports 34, and empty portions that become pressure generation chambers 35 are partitioned by partition walls. It is the formed plate-shaped member. The flow path forming substrate 24 is produced, for example, by etching a silicon wafer. The pressure generating chamber 35 is formed as an elongated chamber in a direction perpendicular to the arrow K of the nozzle opening 26 described above. The common ink chamber 33 is connected to the ink introduction path 19 of the ink introduction needle 19 via an ink communication path 37 (corresponding to a kind of head flow path in the present invention) formed through the height direction of the head case 16. It is a chamber that communicates with ′ and into which the ink stored in the ink cartridge 7 is introduced. The ink introduced into the common ink chamber 33 is supplied to each pressure generating chamber 35 through the ink supply port 34.

  The elastic plate 23 is a double-structured composite plate material in which an elastic film is laminated on a metal support plate such as stainless steel. An island portion 36 for joining the tip of the free end of the piezoelectric vibrator 29 is formed in a portion corresponding to the pressure generating chamber 35 of the elastic plate 23, and this portion functions as a diaphragm portion. Further, the elastic plate 23 seals one opening surface of the empty portion that becomes the common ink chamber 33, and also functions as a compliance portion. Only the elastic film is used for the portion functioning as the compliance portion.

  In the recording head 3, when the piezoelectric vibrator 29 is expanded and contracted in the element longitudinal direction, the island portion 36 moves in a direction close to or away from the pressure generating chamber 35. As a result, the volume of the pressure generating chamber 35 changes, and the pressure in the ink in the pressure generating chamber 35 varies. An ink droplet (a type of droplet) is ejected from the nozzle opening 26 due to the pressure fluctuation.

  As shown in FIG. 3, a rectangular plate-shaped side metal fitting 27 (corresponding to a kind of metal in the present invention) is attached to the side surface of the head case 16. The side metal fittings 27 are made of a metal plate material such as a stainless steel plate.

  The side metal fittings 27 increase the rigidity of the head case 16. Therefore, the recording head 3 to which the side fitting 27 is fixed suppresses crosstalk and suppresses swelling due to moisture.

  A tapered surface 28 ′ whose thickness gradually decreases toward the tip is formed at the tip 28 of the side fitting 27, that is, the end on the nozzle plate 25 side. Moreover, the side metal fitting 27 is attached so that the surface may become parallel to the nozzle row direction (arrow K) mentioned above. That is, the side fittings 27 are fixed to the left and right side surfaces of the head case 16 facing the main scanning direction X. And the side metal fitting 27 is set to the ground potential by connecting to the ground line.

  The front end portion 28 of the side fitting 27 protrudes from the surface 38 of the nozzle plate 25 of the flow path unit 17 by a distance H (see FIG. 3). That is, the side metal fitting 27 extends toward the tip end side of the nozzle opening 26 of the flow path unit 17, and the tip end portion 28 is fixed in a state of protruding from the surface 38 of the nozzle plate 25. For example, the interval H is 0.1 to 0.2 mm.

  Next, an operation when the recording head 3 including the side fitting 27 is moved by the carriage moving mechanism 5 will be described. First, when printing on a recording medium 2 such as recording paper, as shown in FIG. 1, the surface of the recording medium 2 fed by a paper feeding mechanism such as a platen roller 6 is the tip of the nozzle opening 26 of the recording head 3. Positioned to face the side. That is, the surface 38 of the nozzle plate 25 and the front end portion 28 of the side metal fitting 27 are opposed to the recording medium 2. At this time, the distance between the surface 38 of the nozzle plate 25 and the recording medium 2 is set to about 1.7 mm, for example. That is, the distance between the front end portion 28 of the side metal fitting 27 and the recording medium 2 is 1.5 mm to 1.6 mm.

  Then, when ink is ejected onto the recording medium 2 while the recording head 3 attached to the carriage 4 is reciprocated in the main scanning direction X by the carriage moving mechanism 5, the recording medium 2 is swollen by the ink, or the paper is fed. The recording medium 2 may approach the recording head 3 (the surface 38 of the nozzle plate 25 and the side fittings 27). At this time, if the recording medium 2 is charged by friction or the like, or if the recording medium 2 is charged, static electricity of the recording medium 2 is discharged to the nearest side metal fitting 27.

  Further, in the case of a wiping operation in which the surface 38 of the nozzle plate 25 is wiped by the wiper blade 12, the tip of the wiper blade 12 slides on the surface 38 of the nozzle plate 25 after contacting the side metal fitting 27. In this way, ink or the like adhering to the surface 38 of the nozzle plate 25 is wiped off. That is, the wiper blade 12 wipes off ink adhered to the surface 38 of the nozzle plate 25 without coming into contact with the side surfaces of the flow path forming substrate 24 and the nozzle plate 25.

  As described above, the side metal fitting 27 of the present embodiment extends on the side surface of the head case 16 toward the front end side of the nozzle opening 26 of the flow path unit 17, and the front end portion 28 faces the surface 38 of the nozzle plate 25. Since the side metal fitting 27 is fixed in a protruding state, when the recording medium 2 such as recording paper is charged, it is discharged to the side metal fitting 27 that is close to the recording medium 2. For this reason, by setting the side fitting 27 to the ground potential, it is possible to prevent problems such as electrostatic breakdown of the drive circuit and the like, and malfunction due to the static electricity being superimposed on the drive signal as noise. Further, since the side metal fitting 27 covers the side surface of the flow path unit 17, the side surface of the flow path unit 17 is protected and the nozzle plate 25 is peeled off during wiping (wiping) work by the wiper blade 12. Can be prevented. Furthermore, the rigidity of the head case can be increased by metal, and as a result, crosstalk can be suppressed and swelling due to moisture absorption can also be suppressed. Therefore, the reliability and durability of the recording head 3 can be improved.

  In addition, since it is fixed to the side surface of the head case 16 along the nozzle row direction K in which a plurality of nozzle openings 26 are arranged, both edges that intersect the nozzle row direction K of the nozzle plate 25 can be exposed, The degree of freedom of the opening range of the nozzle opening 26 is increased. Furthermore, when wiping (wiping) with the wiper blade 12 or the like, the side surfaces of the flow path forming substrate 24 and the nozzle plate 25 are protected against relative sliding of the wiper blade 12, and peeling of each part is prevented. Can do. If the side surface of the flow path unit 17 has irregularities or steps, the wiper blade 12 can be prevented from being worn or damaged by contacting the irregularities or the like with the wiper blade 12.

  Further, since the tapered portion 28 ′ is formed on the side of the distal end portion 28 of the side metal fitting 27, the wiper blade 12 is not caught on the side metal fitting 27 when the wiper blade 12 is wiped (wiped). Smooth guidance to the nozzle plate 25 side is possible. Thereby, it can prevent that the front-end | tip of the wiper blade 12 is worn out or damaged.

  The front end portion 28 protruded from the surface 38 of the nozzle plate 25 of the flow path unit 17 by an interval H (see FIG. 3), but the side fitting 41 of the recording head 40 of the present invention has a structure as shown in FIG. The distal end portion 28 may be fixed in a state where it is positioned on the same plane with respect to the surface 38 of the nozzle plate 25 of the flow path unit 17. That is, the side fittings 27 and 41 of the present invention need only be in a position where the tip end portion 28 does not retract at least from the surface 38 of the nozzle plate 25 of the flow path unit 17.

  As described above, the side metal fitting 41 extends on the side surface of the head case 16 toward the front end side of the nozzle opening 26 of the flow path unit 17, and the front end portion 28 is flush with the surface 38 of the nozzle plate 25. When the discharge target 2 is charged by friction such as friction with the discharge target 2 such as recording paper, the side metal fitting 27 is set to the ground potential to set the drive circuit. It is possible to prevent problems such as damage (electrostatic breakdown) and malfunctions caused by superimposing this static electricity on the drive signal as noise. Further, since the side metal fitting 27 covers the side surface of the flow path unit 17, the flow path unit is used during a cleaning operation or the like with the wiper blade 12 for wiping off the liquid or the like adhering to the surface 38 of the nozzle plate 25. The side surface of 17 can be protected and the nozzle plate 25 can be prevented from peeling off. Therefore, the reliability of the recording head 3 can be improved. Furthermore, by eliminating the height difference (positional deviation) between the front end portion 28 of the side metal fitting 27 and the surface 38 of the nozzle plate 25, the wiper blade 12 itself can be prevented from being worn or damaged. Then, by preventing the front end portion 28 of the side metal fitting 27 from protruding from the surface 38 of the nozzle plate 25, the distance between the surface 38 of the nozzle plate 25 and the recording medium 2 can be reduced accordingly, and as a result, The landing accuracy of the ink ejected from the nozzle opening 26 can be improved.

  Further, since the distance (gap) between the nozzle plate 25 and the recording medium 2 can be set small, it is possible to land on the designed position even if the ink droplet is small, and to reduce the formation of spray mist.

  Further, the recording head 40 of the present embodiment shown in FIG. 4 fills the space between the nozzle plate 25 and the side fitting 27 with a conductive adhesive 42. The adhesive 42 conducts the nozzle plate 25 and the side metal fitting 27. That is, it is desirable to electrically connect the nozzle plate 25 and the side metal fitting 27 by filling the gap with the adhesive 42, and to set both to the ground potential. With this configuration, it is possible to reliably prevent inconveniences such as electrostatic breakdown even if static electricity from the recording medium 2 flows to either the side metal fitting 27 or the nozzle plate 25.

  Moreover, the nozzle plate 25 and the side metal fitting 27 may be brought into direct contact by extending both ends of the nozzle plate 25 in the width direction, and the nozzle plate 25 and the side metal fitting 27 may be electrically connected.

  As described above, even when the nozzle plate 25 and the side fitting 27 are brought into direct contact with each other, when static electricity falls on the nozzle plate 25, the static electricity can be conducted to the side fitting 27 side to reliably remove the static electricity.

  In addition, the side metal fitting 27 of the above-described embodiment is fixed to the side surface of the head case 16 along the nozzle row direction K. However, the side metal fitting 27 is attached to the head case 16 in a direction orthogonal to the nozzle row direction K. It may be fixed to the side.

  According to the above configuration, the side metal fitting 27 is fixed to the side surface of the head case 16 in the direction orthogonal to the nozzle row direction K, so that the side metal fitting 27 is disposed on the side surface of the head case 16 in the nozzle row direction K. Small width is enough. Therefore, the side fitting 27 can be reduced in size, and the recording head 3 can be reduced in weight, so that there is little vibration even when the reciprocating scanning is performed at high speed.

  Furthermore, the side metal fittings 27 may be fixed to the side surface of the head case 16 that intersects the wiping direction. By fixing the side fitting 27 in this way, the side surfaces of the flow path forming substrate 24 and the nozzle plate 25 are protected against relative sliding of the wiper blade 12 during wiping, and each part is peeled off. Can be prevented.

In the above, the printer 1 which is a kind of liquid ejecting apparatus has been described as an example, but the present invention can also be applied to other liquid ejecting apparatuses. For example, display manufacturing equipment for manufacturing color filters such as liquid crystal displays, organic EL (Electro
The present invention can also be applied to an electrode manufacturing apparatus for forming electrodes such as a Luminescence display and an FED (surface emitting display), a chip manufacturing apparatus for manufacturing a biochip (biochemical element), and the like.

FIG. 2 is a perspective view illustrating a configuration of a printer. FIG. 2 is an exploded perspective view illustrating a configuration of a recording head. 2 is a cross-sectional view illustrating an internal structure of a recording head. FIG. It is sectional drawing explaining the internal structure of the recording head in other embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 3 ... Recording head, 16 ... Head case, 17 ... Flow path unit, 22 ... Vibrator unit, 24 ... Flow path formation board | substrate, 25 ... Nozzle plate, 26 ... Nozzle opening, 27 ... Side metal fitting, 28 ... Tip part, 29 ... Piezoelectric vibrator, 35 ... Pressure generating chamber, 38 ... Surface, 40 ... Recording head, 41 ... Side fitting, K ... Nozzle row direction

Claims (5)

A liquid ejecting head for ejecting liquid droplets from a nozzle,
An actuator unit having a pressure generating element for giving pressure fluctuation;
A flow path unit comprising a nozzle forming member having a plurality of nozzles opened and a flow path forming substrate in which a pressure generation chamber communicating with the nozzle is formed;
A head case for holding the actuator unit and the flow path unit;
A metal is fixed to the side surface of the head case in a state of extending toward the nozzle tip side of the flow path unit and having the tip part at least protruding from the tip side surface of the nozzle forming member. A liquid ejecting head.   The liquid ejecting head according to claim 1, wherein the nozzle forming member and the metal are electrically connected.   The liquid ejecting head according to claim 1, wherein the metal is fixed to a side surface of the case along a nozzle row direction in which a plurality of nozzles are arranged.   The liquid ejecting head according to claim 1, wherein the metal is fixed to a case side surface in a direction orthogonal to a nozzle row direction in which a plurality of nozzles are arranged.   The liquid ejecting head according to claim 1, wherein the metal is fixed to a side surface of the case that intersects the wiping direction.

Images