JP2011161672A - Liquid ejecting head, and liquid ejecting apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a liquid ejecting head capable of making ejecting characteristics well in a constitution in which a liquid is distributed into a plurality of pressure chambers from a common liquid chamber, and to provide a liquid ejecting apparatus. <P>SOLUTION: The common liquid chamber 32 has a construction as follows. A first protruding part 45a protruding toward one side faces of the pressure chambers 36 facing other side face of the common liquid chamber 32, from the other side face in a direction orthogonal to an arrangement direction of the pressure chambers, locally narrows an area of the cross-section at the first protruding part 45a, of the common liquid chamber 32 in that protruding direction; the first protruding part 45a is formed in the vicinity of a one side introduction port 31a; a second protruding part 45b protruding from the other side face toward the one side faces is formed between the first protruding part and other side introduction port 31b; an opening area of the one side introduction port is larger than that of the other side introduction port. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a liquid ejecting head such as an ink jet recording head and a liquid ejecting apparatus including the same, and in particular, reaches an nozzle through an inlet, a common liquid chamber, an individual supply path, and a pressure chamber. The present invention relates to a liquid ejecting head having a series of liquid flow paths and a liquid ejecting apparatus.

  The liquid ejecting apparatus includes a liquid ejecting head that can eject liquid from a nozzle, and ejects various liquids from the liquid ejecting head. As a typical example of this liquid ejecting apparatus, for example, an ink jet recording apparatus that includes an ink jet recording head (hereinafter referred to as a recording head) and performs recording by ejecting liquid ink as ink droplets from the recording head ( And an image recording apparatus such as a printer. In recent years, liquid ejecting heads have been applied not only to this image recording apparatus but also to the formation of color filters, organic EL elements, thin film transistors for liquid crystal panels, and the like.

  A recording head, which is a kind of the liquid ejecting head, is provided with a nozzle group (nozzle row) composed of a plurality of nozzles for each ink type (color, etc.), and each nozzle has a corresponding pressure chamber. Communicating with In addition, the recording head is provided with a common liquid chamber (also referred to as a reservoir or a manifold) into which ink for distribution to a plurality of pressure chambers is introduced. The common liquid chamber extends in the direction in which the pressure chambers are arranged in plan view, and is a hollow portion having a predetermined width (width in a direction perpendicular to the direction in which the pressure chambers are arranged) and depth. The common liquid chamber is provided for each nozzle group, that is, for each type of ink. Therefore, a plurality of common liquid chambers are provided in a recording head that ejects a plurality of types of ink.

  In a general common liquid chamber, an introduction port, which is a connection port with a liquid introduction path, is positioned at the center of the pressure chamber arrangement direction. Ink from a liquid supply source such as an ink cartridge is introduced into the common liquid chamber through the liquid introduction path, and is distributed from the common liquid chamber to each pressure chamber through the individual supply path. Then, by driving a pressure generating means such as a piezoelectric element, a pressure fluctuation is generated in the ink in the pressure chamber, and the ink is ejected from the nozzle using this pressure fluctuation.

  In recent years, with the increase in the number of nozzles, there is also a recording head in which the common liquid chamber is elongated in the nozzle arrangement direction (pressure chamber arrangement direction). In such a recording head, when ink is introduced from one inlet to the common liquid chamber, the amount of ink supplied to the pressure chamber is insufficient due to pressure loss at the end of the common liquid chamber far from the inlet. There is a risk that bubbles may remain due to insufficient flow. In order to suppress such a problem, a configuration in which a plurality of introduction ports are provided for one common liquid chamber has been proposed (see, for example, Patent Document 1). In the case of this configuration, stagnation occurs in the ink merging region, and there is a possibility that bubbles may be difficult to be discharged due to this stagnation. Therefore, in the recording head disclosed in Patent Document 1, the ink is supplied from a plurality of inlets. From the surface opposite to the pressure chamber side so that the cross-sectional area of the common liquid chamber in the direction orthogonal to the pressure chamber arrangement direction in the ink confluence region is smaller than the cross-sectional area in other regions other than the confluence region. A protruding portion (hereinafter referred to as a throttle portion) is provided on the pressure chamber side surface, and the squeezing is suppressed by the throttle portion, thereby improving the bubble discharge performance.

JP 2009-226943 A

  By the way, as shown in FIG. 4, due to the relationship with the arrangement position of the introduction port 51 of the adjacent common liquid chamber 50, it is close to one of the introduction ports 53 a and 53 b in the common liquid chamber 52. In some cases, a portion where the cross-sectional area of the common liquid chamber 52 in the direction orthogonal to the direction in which the pressure chambers are arranged is smaller than the cross-sectional area of other portions (hereinafter referred to as the first throttle portion 54) may be formed. Although the first throttle portion 54 is structurally similar to the above-described throttle portion, it is not intentionally provided and is close to the introduction port 53a, so that no bubble discharge effect can be expected. That is, if the first throttle portion 54 is close to the inlet 53a, the position corresponding to the first throttle portion 54 from the relationship with the minimum required flow rate of ink flowing from the inlet 53a. In addition, it is difficult to set the ink merging area from each of the inlets 53a and 53b by adjusting the flow rate, and the ink is slightly displaced from the first throttle 54 to the other inlet 53b side (J in the figure). Join. In this case, bubbles are likely to stay between the first throttle portion and the merge region J. The flow of ink from the introduction port 53a is obstructed by the first throttle portion 54, so that the merge area J is closer to the introduction port 53a than the intermediate point between the introduction ports 53a and 53b. And the closer the distance between the first constricted portion 54 and the merge area J is, the more likely it is to stagnate (except when the positions of the two pressure chambers are aligned). For example, when the distance between adjacent inlets 53a and 53b of the same common liquid chamber is about 8.5 to 9.0 mm, the distance from the inlet 53a to the first throttle portion 54 is 1.1 to. The range is about 4.0 mm.

  The present invention has been made in view of such circumstances, and an object thereof is to provide a liquid ejecting head and a liquid ejecting apparatus capable of improving the bubble discharge performance.

The present invention has been proposed to achieve the above object, and has a liquid introduction path, a common liquid chamber, an individual supply path, and a series of liquid flow paths that reach the nozzle through the pressure chamber. The liquid from the source is introduced into the common liquid chamber through a plurality of inlets through a liquid introduction path, the liquid in the common liquid chamber is distributed to the plurality of pressure chambers through the individual supply path, and the pressure generating means is driven. A liquid ejecting head that ejects liquid from the nozzle by causing pressure fluctuation in the liquid in the pressure chamber;
A plurality of the inlets are provided for one common liquid chamber,
In the common liquid chamber, a cross-sectional area of the common liquid chamber in a direction orthogonal to the pressure chamber arrangement direction protruding from the other surface facing the one side surface that is the surface on the pressure chamber side toward the one side surface. Is formed in a state of being close to a predetermined introduction port among the plurality of introduction ports, and the first restriction unit is locally narrower than the cross-sectional area in the other part, A second protrusion protruding from the other side surface toward the one side surface between the predetermined introduction port and the other introduction port adjacent to the first throttle portion with the first throttle portion interposed therebetween. An aperture is provided,
The opening area of the predetermined introduction port is larger than the opening area of the other introduction port.

  In the above-described configuration, it is desirable to adopt a configuration in which the distance between the first throttle portion and the predetermined inlet is smaller than the distance between the second throttle portion and the other inlet.

  It is desirable that the second constriction unit adopt a configuration provided in a region where a flow of liquid flowing in from the predetermined introduction port and a flow of liquid flowing in from the other introduction port merge.

  According to another aspect of the invention, a liquid ejecting apparatus includes any one of the liquid ejecting heads configured as described above.

  According to the present invention, in the common liquid chamber, the first throttle portion formed in a state of being close to the predetermined inlet among the plurality of inlets, and the first throttle with respect to the predetermined inlet Since the second throttle part is provided between the other inlets adjacent to each other with the throttle part interposed therebetween, the opening area of the predetermined inlet is set larger than the opening area of the other inlets. The merging area of the liquid flowing in from the introduction port can be adjusted to a position corresponding to the second throttle portion that is separated from the first throttle portion. Thereby, it is possible to suppress the stagnation of the liquid, and as a result, it is possible to improve the bubble discharge performance. That is, in the merging region, the liquid flow from both sides along the pressure chamber arrangement direction is guided toward the pressure chamber side by the second throttle portion, and in addition to this, the pressure chamber arrangement direction of the region Since the cross-sectional area is reduced, the flow velocity is increased, so that the liquid is prevented from stagnation in this region. Further, by providing the second throttle portion at a position away from the first throttle portion, it is possible to prevent liquid from squeezing between the first throttle portion and the second throttle portion. Thereby, the discharge | emission property of a bubble improves. By improving the discharge performance of the bubbles, it is possible to prevent the ejection characteristics such as the amount of liquid ejected from the nozzle and the flight speed from being deteriorated due to the bubbles in the common liquid chamber.

FIG. 3 is a perspective view illustrating a configuration of a printer. FIG. 3 is a cross-sectional view of a main part of the recording head. It is a top view explaining the structure of a common liquid chamber periphery. It is a top view explaining the structure of the conventional common liquid chamber periphery.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments for carrying out the present invention will be described 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 the following, an ink jet recording apparatus (hereinafter referred to as a printer) will be described as an example of the liquid ejecting apparatus of the invention.

  FIG. 1 is a perspective view illustrating the basic configuration of the printer 1. As shown in FIG. 1, the printer 1 has a carriage 3 attached to a guide shaft 2, and a recording head 4 (a kind of liquid ejecting head of the present invention) is attached to the lower surface thereof. An ink cartridge 10 (a kind of liquid supply source) is detachably held on the carriage 3. The carriage 3 is connected to a timing belt 8 that is stretched between a drive pulley 6 and an idler pulley 7 that are joined to the rotation shaft of the carriage motor 5, and the recording paper 9 is driven by the carriage motor 5. Move in the width direction (main scanning direction). That is, the carriage motor 5, the drive pulley 6, the idle pulley 7, and the timing belt 8 constitute a carriage moving mechanism.

  The ink cartridge 10 is a storage member that stores ink (a kind of liquid of the present invention). This ink is obtained by dissolving or dispersing a color material in an ink solvent. For example, a pigment or a dye is used as the color material, and water is used as the ink solvent. When the ink cartridge 10 is mounted on the carriage 3, an ink supply needle (not shown) of the recording head 4 is inserted into the ink cartridge 10. Since the ink supply needle communicates with an ink flow path (a kind of liquid flow path) inside the recording head 4, the ink in the ink cartridge 10 is supplied into the recording head 4 when the ink supply needle is inserted. It becomes a state. As the ink cartridge, an ink cartridge arranged on the printer main body (housing) side and supplied to the recording head 4 through an ink supply tube can be adopted.

  A platen 11 is provided below the guide shaft 2. The platen 11 is a plate-like member that supports the recording paper 9 from below. The platen 11 is provided with a liquid absorbing member 12 such as a sponge. In addition, a paper feed roller 13 is disposed in parallel with the guide shaft 2 on the upstream side of the liquid suction member 12. The paper feed roller 13 is rotated by a driving force from a paper feed motor 14 (stepping motor or DC motor) when the recording paper 9 is conveyed. That is, the paper feed roller 13 and the paper feed motor 14 constitute a paper feed mechanism.

  A home position is set at a position within the movement range of the carriage 3 and outside the platen 11. The recording head 4 is positioned at the home position in the standby state. At this home position, a wiper mechanism 15 for wiping the nozzle forming surface of the recording head 4 and a capping mechanism 16 capable of sealing the nozzle forming surface in a non-recording state are arranged side by side along the guide shaft 2. Has been.

  FIG. 2 is a cross-sectional view of a main part for explaining the configuration of the recording head 4. The illustrated recording head 4 includes an actuator unit 23 in which a plurality of piezoelectric elements 20, a fixed plate 21, a flexible cable 22, and the like are unitized, a case 24 that can store the actuator unit 23, and a bottom surface of the case 24. The flow path unit 25 is provided.

  The case 24 is a block-shaped member made of synthetic resin in which a housing empty portion 26 is formed. The storage space 26 is a space for storing the actuator unit 23, and the actuator unit 23 is stored and fixed in the storage space 8 by bonding the fixing plate 21 to the inner wall surface of the storage space 26. . In this stored state, the distal end surface of the free end of the piezoelectric element 20 faces the opening on the bottom surface side of the storage space 26 and is joined to the island portion 28 of the flow path unit 25. In addition, in the case 24, an ink introduction path 29 (a kind of liquid introduction path) communicating between the upper surface side and the common liquid chamber 32 of the flow path unit 25 is passed through the height direction of the case 24. Is provided. The upstream side of the ink introduction path 29 communicates with an ink supply needle (not shown), and the downstream side communicates with a common liquid chamber 32 of the flow path unit 25 through an introduction port 31. The ink introduced from the liquid supply source such as the ink cartridge 10 through the ink supply needle is supplied from the introduction port 31 to the common liquid chamber 32 side through the ink introduction path 29.

  The piezoelectric element 20 (a kind of pressure generating means) of the actuator unit 23 is formed in a comb-teeth shape cut into a width of about several tens of μm to 100 μm. Each piezoelectric element 20 is in a so-called cantilever state in which a free end portion protrudes outward from the front end surface of the fixing plate 21 (the end surface on the flow channel unit 25 side in the attached state to the case 24). The base end is fixed to the fixing plate 21. The piezoelectric element 20 is a stacked type configured by alternately stacking piezoelectric bodies and internal electrodes, and is a type of piezoelectric element that can expand and contract in a vertical direction (element longitudinal direction) orthogonal to the electric field direction. Accordingly, the free end of the piezoelectric element 20 contracts in the longitudinal direction of the vibrator by charging, and the free end of the piezoelectric element 20 extends in the longitudinal direction of the vibrator by discharging. The flexible cable 22 is electrically connected to the base end portion of each piezoelectric element 20.

  In the flow path unit 25, the nozzle substrate 33 is disposed on one surface of the flow path substrate 34, and the diaphragm 37 is disposed on the other surface opposite to the nozzle substrate 33 and integrated by bonding or the like. It is configured. The nozzle substrate 33 is a thin plate made of stainless steel or organic plastic film in which a plurality of nozzles 35 are opened in a row at a pitch corresponding to the dot formation density. In this embodiment, for example, 180 nozzles 35 are opened at a pitch of 180 dpi, and these nozzles 35 constitute a nozzle row (a kind of nozzle group). The recording head 4 in this embodiment is provided with a plurality of nozzle rows. In FIG. 2, only the configuration corresponding to one nozzle row is shown, but the configuration corresponding to the other nozzle rows is the same.

  The flow path substrate 34 is a member made of a silicon single crystal substrate that is formed in a plural number in a state in which empty portions that become pressure chambers 36 are partitioned by partition walls so as to correspond to the respective nozzles 35 of the nozzle substrate 33. In addition, in the flow path substrate 34 in the present embodiment, in addition to an empty portion serving as the pressure chamber 36, an individual supply path 39 provided for each pressure chamber, and each pressure chamber 36 via the individual supply path 39. Thus, an empty portion serving as a common liquid chamber 32 communicating therewith is formed by etching. The pressure chamber 36, the individual supply path 39, and the common liquid chamber 32 may be formed on different members.

  The pressure chamber 36 is a hollow portion elongated in a direction orthogonal to the direction in which the nozzles 35 are arranged, and extends from the upper surface of the flow path substrate 34 (the surface on the side to which the vibration plate 37 is joined) to the middle in the substrate thickness direction. It is formed by an etching process. A nozzle communication port 38 is provided at one end of the pressure chamber 36 in the longitudinal direction (a direction orthogonal to the pressure chamber arrangement direction) so as to penetrate the plate thickness direction. The nozzle communication port 38 is formed so as to penetrate the thickness direction of the flow path substrate 34, and communicates between the pressure chamber 36 and the nozzle 35. The individual supply path 39 is a groove-shaped space formed between the other longitudinal end of the pressure chamber 36 and the common liquid chamber 32, and the depth thereof is aligned with the depth of the pressure chamber 36. The flow path width is sufficiently narrower than the width of the pressure chamber 36.

  The diaphragm 37 has a double structure in which an elastic film 43 made of a resin film such as PPS (polyphenylene sulfide) is laminated on a support plate 42 such as stainless steel, and seals one opening surface of the pressure chamber 36. And a compliance portion that seals one opening surface of the common liquid chamber 32. The diaphragm portion is manufactured by annularly etching the portion of the support plate 42 corresponding to the pressure chamber 36, and an island portion 28 is formed in the ring. In the compliance portion, the support plate 42 corresponding to the common liquid chamber 32 is removed by etching, and only the elastic film 43 is formed.

  In the recording head 4 configured as described above, the island portion 28 is pressed toward the nozzle substrate 33 by extending the piezoelectric element 20 in the longitudinal direction of the vibrator. By this pressing, the elastic film 43 constituting the diaphragm portion is deformed and the pressure chamber 36 is contracted. When the piezoelectric element 20 is contracted in the longitudinal direction of the vibrator, the pressure chamber 36 is expanded by the elasticity of the elastic film 43. Since the internal ink pressure fluctuates due to the expansion and contraction of the pressure chamber 36, an ink droplet (a kind of droplet) can be ejected from the nozzle 35 by controlling the expansion and contraction.

Next, features of the recording head 4 according to the present invention will be described.
FIG. 3 is a plan view of the main part of the flow path substrate 34 for explaining the configuration of the ink flow path from the inlet 31 to the nozzle 35. FIG. 3 mainly shows a configuration corresponding to one nozzle row. Further, in the drawing, in order to explain the positional relationship with the configuration of another nozzle row adjacent thereto, only a part of the configuration corresponding to the other nozzle row is indicated by a one-dot chain line.

  The common liquid chamber 32 in the present embodiment is a substantially trapezoidal hollow portion in plan view that extends in the direction in which the pressure chambers are arranged, and is formed so as to penetrate the flow path substrate 34. Communicated with. Both side surfaces 40a, 40b of the common liquid chamber 32 in the pressure chamber arrangement direction are dimensioned in the pressure chamber arrangement direction of the common liquid chamber 32 from the inlet 31 side (other side) toward the pressure chamber side (one side). Is a tapered surface inclined so as to gradually expand. As a result, ink stagnation and insufficient supply of ink to the pressure chamber 36 at the end of the common liquid chamber 32 in the pressure chamber arrangement direction are suppressed. An opening portion of the upper surface (surface on the vibration plate 37 side) of the common liquid chamber 32 is sealed by an elastic film 43 of the vibration plate 37 joined to the flow path substrate 34, and this portion becomes a compliance portion. (See FIG. 2). The opening on the lower surface opposite to the upper surface is sealed with a nozzle substrate 33 bonded to the flow path substrate 34. That is, the nozzle substrate 33 also functions as the bottom of the common liquid chamber 32. In addition, the other end of each individual supply path 39 communicating with the pressure chamber 36 at one end is opened on the surface of the common liquid chamber 32 on the pressure chamber 36 side.

  In the common liquid chamber 32 in the present embodiment, a plurality of, in this example, two introduction ports 31a and 31b are provided in a state of being spaced apart from each other. An ink introduction path 29 of the case 24 is connected to each introduction port 31a, 31b in a liquid-tight state. In addition, although each inlet 31a, 31b is formed in the diaphragm 37, since this part partitions the common liquid chamber 32, the common liquid chamber 32 has each inlet 31a, 31b. It can be said. In the present embodiment, the interval between the introduction ports 31a and 31b is set to 10.27 mm.

In the present embodiment, as shown in FIG. 3, at a position close to one of the plurality of inlets 31a and 31b in the common liquid chamber 32 (corresponding to a predetermined inlet in the present invention) A first projecting portion 45a (corresponding to the first throttle portion in the present invention) projecting from the surface opposite to the pressure chamber side (the other surface) toward the pressure chamber side surface (one surface). Is formed. The first protrusion 45a is provided with an introduction port 31 'of a common liquid chamber 32' corresponding to another adjacent nozzle row (that is, joined to the diaphragm 37 around the introduction port 31 to be liquid-tight. In the present embodiment, it is composed of rib-shaped protrusions formed along the substrate thickness direction from the upper surface side to the lower surface of the flow path substrate 34. The The protrusion 45a is formed in a tapered state in which the width in the direction in which the pressure chambers are arranged gradually decreases from the other side surface to the one side surface in a plan view. The cross-sectional area of the common liquid chamber 32 in the direction orthogonal to the pressure chamber arrangement direction at the position where the first protrusion 45a is formed is locally narrower than the cross-sectional area of the other portions.
Note that the term “adjacent” does not necessarily mean that it is in contact with each other, but means an adjacent position or an adjacent position. For example, if the interval between adjacent inlets in the same common liquid chamber is about 8.5 to 9.0 mm, the distance from one inlet to the first throttle portion is close to the range of about 1.1 to 4.0 mm. And

  Further, between the first protrusion 45a and the other inlet 31b adjacent to the one inlet 31a with the first protrusion 45a in between, the distance from the other surface is one. A second protruding portion 45b (corresponding to the second throttle portion in the present invention) protruding toward the side surface is provided. The second projecting portion 45b is a portion intentionally provided to improve the bubble discharging property, and the shape thereof is the same as that of the first projecting portion 45a. Here, the distance Da from the center of one inlet 31a to the first protrusion 45a is smaller than the distance Db from the center of the other inlet 31b to the second protrusion 45b. In the form, Db is about 2.6 mm while it is about 1.1 mm.

  The formation position of the second protrusion 45b is preferably between the first protrusion 45a and the other inlet 31b and as far as possible from both. In the present embodiment, the second protrusion 45b is formed at an intermediate position between the first protrusion 45a and the other inlet 31b in the pressure chamber arrangement direction. And the opening area of one inlet 31a is larger than the opening area of the other inlet 31b. By doing so, the flow rate of the ink flowing from the introduction port 31a is adjusted to be larger than the flow rate of the ink flowing from the introduction port 31b. In the present embodiment, the ratio of the opening area of the introduction port 31a to the opening area of the introduction port 31b is 1: 0.6, specifically, the diameter of the introduction port 31a is 1.63 mm. The ratio of each opening area is adjusted by setting the diameter of 31b to 1.26 mm.

  In the recording head 4 configured as described above, the ink introduced from the ink supply needle side and flowing down the ink introduction path 29 flows into the common liquid chamber 32 side through the respective inlet ports 31a and 31b. As described above, since the opening area of one introduction port 31a is larger than the opening area of the other introduction port 31b, the flow rate of ink flowing from the introduction port 31a is the ink flowing from the introduction port 31b. More than the flow rate. As a result, the merge area J of the ink that has flowed into the common liquid chamber 32 from each of the inlets 31a and 31b is biased toward the other inlet 31b as compared with the configuration in which the opening areas of the inlets 31a and 31b are the same. The position, specifically, the position corresponding to the second protrusion 45b is adjusted. In other words, the second protrusion 45b is provided at a position corresponding to the merge area J. In the merge area J, the ink flow from both sides along the pressure chamber arrangement direction is guided toward the pressure chamber side by the second protrusion 45b, and in addition, the pressure chamber arrangement direction of the area Since the flow speed increases due to the narrow width (cross-sectional area) of the ink, it is possible to prevent ink from stagnation in this region. Further, by providing the second projecting portion 45b at a position away from the first projecting portion 45a, it is possible to prevent ink from stagnation between the first projecting portion 45a and the second projecting portion 45b. Thereby, the discharge property of the bubbles in the ink flow path is improved. By improving the bubble discharge performance, it is possible to prevent the ejection characteristics such as the amount of ink ejected from the nozzle 35 and the flying speed from being deteriorated due to the bubbles in the ink flow path. As a result, the recording quality when an image or the like is recorded on a recording medium such as the recording paper 9 is improved.

  In the present embodiment, the protrusions 45a and 45b are formed in a tapered state in which the width in the pressure chamber arrangement direction gradually decreases from the other side surface to the one side surface in a plan view. The flow of ink from both sides in the direction can be smoothly guided to the pressure chamber side, whereby ink stagnation can be suppressed.

  Note that the shapes of the protrusions 45a and 45b are not limited to those exemplified in the present embodiment. In short, any shape may be used as long as the cross-sectional area of the common liquid chamber in the direction orthogonal to the direction in which the pressure chambers are arranged at the position where the protrusion is formed is locally narrower than the cross-sectional area of other portions. .

  Furthermore, in the above-described embodiment, the configuration in which two introduction ports 31 a and 31 b are provided for one common liquid chamber 32 is illustrated, but three or more introduction ports 31 are provided for one common liquid chamber 32. The present invention can also be applied to a configuration that can be used.

  The present invention is also applicable to a recording head having a structure other than the recording head 4 exemplified in the above embodiment as long as it has a common liquid chamber into which ink to be supplied to a plurality of pressure chambers is introduced. Can do. For example, the present invention can also be applied to a type of recording head in which a so-called flexural vibration type piezoelectric element is individually provided for each pressure chamber. In addition, the recording head is not limited to ejecting ink, and other liquid ejecting heads, for example, a color material ejecting head used for manufacturing a color filter such as a liquid crystal display, an organic EL (Electro Luminescence) display, and an FED (surface emitting display). The present invention can also be applied to an electrode material ejecting head used for electrode formation, a bioorganic matter ejecting head used for manufacturing a biochip (biochemical element), and the like.

  DESCRIPTION OF SYMBOLS 1 ... Printer, 4 ... Recording head, 20 ... Piezoelectric element, 29 ... Ink introduction path, 31 (31a, 31b) ... Introduction port, 32 ... Common liquid chamber, 35 ... Nozzle, 36 ... Pressure chamber, 39 ... Individual supply path , 40 (40a, 40b) ... side face, 45 (45a, 45b) ... protrusion

Claims (4)

A liquid introduction path, a common liquid chamber, an individual supply path, and a series of liquid flow paths extending from the pressure chamber to the nozzle, and the common liquid is supplied from a plurality of inlets through the liquid introduction path. The liquid in the common liquid chamber is distributed to a plurality of pressure chambers through the individual supply passages, and the pressure in the pressure chamber is changed by driving the pressure generating means to eject the liquid from the nozzles. A liquid jet head,
A plurality of the inlets are provided for one common liquid chamber,
In the common liquid chamber, a cross-sectional area of the common liquid chamber in a direction orthogonal to the pressure chamber arrangement direction protruding from the other surface facing the one side surface that is the surface on the pressure chamber side toward the one side surface. Is formed in a state of being close to a predetermined introduction port among the plurality of introduction ports, and the first restriction unit is locally narrower than the cross-sectional area in the other part, A second protrusion protruding from the other side surface toward the one side surface between the predetermined introduction port and the other introduction port adjacent to the first throttle portion with the first throttle portion interposed therebetween. An aperture is provided,
The liquid ejecting head according to claim 1, wherein an opening area of the predetermined inlet is larger than an opening area of the other inlet.   The liquid ejecting head according to claim 1, wherein a distance between the first throttle portion and the predetermined inlet is smaller than a distance between the second throttle portion and the other inlet.   The second throttle part is provided in a region where a flow of liquid flowing in from the predetermined introduction port and a flow of liquid flowing in from the other introduction port merge. The liquid ejecting head according to claim 2.   A liquid ejecting apparatus comprising the liquid ejecting head according to claim 1.

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