JP2011212897A - Liquid ejection head, liquid ejection head unit and liquid ejection device - Google Patents

Abstract

An object of the present invention is to suppress the choking of a filter by bubbles and supply liquid stably, and also to suppress the remaining of bubbles in a flow path to suppress deterioration of liquid supply properties and liquid discharge characteristics. Provided are a liquid ejecting head, a liquid ejecting head unit, and a liquid ejecting apparatus.
A head main body provided with a nozzle opening for ejecting liquid and a supply member 3 for supplying liquid from a liquid supply source to the head main body are provided. The supply member 3 includes a filter inside. A filter chamber 35 provided with 32, a supply port 37 having an opening on the ceiling 36 opposite to the filter 32 of the filter chamber 35, and a supply path 38 for supplying liquid to the filter chamber 35; A bubble retaining part 42 that retains bubbles and is provided on the ceiling 36 side of the filter chamber 35, the supply port 37 is provided on the upper side in the vertical direction with respect to the filter 32, The ratio of the minimum width of the ceiling 36 to the inner diameter of the supply port 37 that opens on the ceiling 36 side is 6.25 or more.
[Selection] Figure 2

Description

  The present invention relates to a liquid ejecting head that ejects liquid from a nozzle opening, a liquid ejecting head unit, and a liquid ejecting apparatus.

  In an ink jet recording head, which is a typical example of a liquid ejecting head, generally, an ink cartridge which is a liquid storage unit filled with ink is detachably inserted into or extended from the ink cartridge. Ink is supplied to the head main body through an ink supply needle formed as an ink supply body disposed at the tip of a supply pipe such as a tube and an ink supply path formed in a supply member such as a cartridge case for holding the ink cartridge. Ink supplied to the head body is ejected from the nozzles by driving pressure generating means such as a piezoelectric element provided in the head body.

  In such an ink jet recording head, in order to solve a discharge failure such as missing dots due to bubbles or the like, bubbles or dust in the ink is removed between the ink supply needle inserted into the ink cartridge and the cartridge case. For example, Patent Documents 1 and 2 are known.

JP 2009-6730 A Japanese Patent Laid-Open No. 11-20186

  However, when a filter chamber with an opening area gradually increasing toward the filter is provided upstream of the filter, the bubbles staying in the filter chamber are pressed by the ink from the upstream of the filter and come into contact with the filter surface. As a result, the effective area of the filter is reduced to increase the flow path resistance, and the ink supply characteristics are deteriorated to adversely affect the ink ejection characteristics. In addition, when performing a suction operation for sucking ink in the flow path from the nozzle opening, if air bubbles block a part of the filter, the ink supply characteristics deteriorate, and cleaning by the suction operation in the ink jet recording head is performed. There is a problem that it cannot be performed normally. In addition, there is a problem that air bubbles may pass through the filter and remain in the flow path downstream of the filter by the suction operation.

  In view of such circumstances, the present invention can suppress the choking of the filter due to the bubbles and supply the liquid stably, and also suppress the remaining of the bubbles in the flow path and can supply the liquid and discharge the liquid. It is an object of the present invention to provide a liquid ejecting head, a liquid ejecting head unit, and a liquid ejecting apparatus that can suppress a decrease in the above.

An aspect of the present invention that solves the above problems includes a head main body provided with a nozzle opening for ejecting liquid, and a supply member that supplies liquid from a liquid supply source to the head main body. Has a filter chamber provided with a filter therein, a supply port opening on the ceiling side facing the filter of the filter chamber, a supply path for supplying liquid to the filter chamber, and a filter chamber A bubble retention portion that is provided on the ceiling side and retains bubbles, wherein the supply port is provided vertically above the filter, and the supply port opens on the ceiling side of the supply path. In the liquid jet head, the ratio of the minimum width of the ceiling to the inner diameter is 6.25 or more.
In such an aspect, by defining the minimum diameter of the ceiling with respect to the inner diameter of the supply port, a gas layer in which bubbles stay on the ceiling side is formed, and during the suction operation of sucking the liquid from the nozzle opening, the liquid is discharged from the supply port. The filter chamber can be fed through. For this reason, bubbles are moved to the filter side due to the liquid supply, and the filter is prevented from being covered with the moved bubbles, thereby reducing the effective area of the filter and supplying defects and discharging defects due to bubbles entering the head body. Can be suppressed.

  Here, it is preferable that an angle from the supply port of the ceiling toward the side wall of the filter chamber is 90 degrees or more with respect to a vertical direction. According to this, it is possible to easily form a gas layer in which bubbles stay on the ceiling side.

  Moreover, it is preferable that the said supply port opens to the end surface of the protrusion part which protruded and provided in the said filter side from the said ceiling. According to this, the area | region which opposes the supply port of the gas layer which retains on a ceiling by a protrusion part becomes thin, and it can make it easy to penetrate a gas layer with the supplied liquid.

According to another aspect of the invention, there is provided a liquid ejecting head unit including a plurality of liquid ejecting heads according to the above aspects.
In this aspect, it is possible to realize a liquid jet head unit that suppresses liquid supply failure and ejection failure.

  According to another aspect of the invention, there is provided a liquid ejecting apparatus including the liquid ejecting head unit or the liquid ejecting head according to the above aspect. In this aspect, it is possible to realize a liquid ejecting apparatus that suppresses liquid supply failure and ejection failure.

FIG. 3 is a cross-sectional view of the recording head according to the first embodiment. 3 is a cross-sectional view of a supply member according to Embodiment 1. FIG. FIG. 3 is a cross-sectional view showing the behavior of ink and bubbles of a supply member according to Embodiment 1. FIG. 3 is a cross-sectional view showing the behavior of ink and bubbles of a supply member according to Embodiment 1. 6 is a cross-sectional view of a supply member according to Embodiment 2. FIG. It is sectional drawing of the supply member which concerns on Embodiment 3. FIG. It is sectional drawing of the supply member which concerns on other embodiment. 1 is a diagram illustrating a schematic configuration of a recording apparatus according to an embodiment.

Hereinafter, the present invention will be described in detail based on embodiments.
(Embodiment 1)
FIG. 1 is a cross-sectional view of an ink jet recording head that is an example of a liquid jet head according to Embodiment 1 of the present invention, and FIG. 2 is a cross-sectional view of a supply member.

  As shown in FIG. 1, an ink jet recording head 1 according to this embodiment includes a head main body 2 that ejects ink, and a supply member 3 that supplies ink from a storage unit (not shown) to the head main body 2. To do.

  The head main body 2 is a type having a longitudinal vibration type piezoelectric element, and a plurality of pressure generating chambers 12 are arranged in parallel on the flow path substrate 11 constituting the head main body 2. Sealed by a nozzle plate 14 having a nozzle opening 13 corresponding to the pressure generating chamber 12 and a vibration plate 15. In addition, the flow path substrate 11 is formed with a manifold 17 that communicates with each pressure generation chamber 12 via an ink supply port 16 and serves as a common ink chamber for the plurality of pressure generation chambers 12. Ink is supplied.

  On the opposite side of the diaphragm 15 from the pressure generation chamber 12, the tip of the piezoelectric element 18 is provided in contact with a region corresponding to each pressure generation chamber 12. These piezoelectric elements 18 are laminated by sandwiching piezoelectric materials 19 and electrode forming materials 20 and 21 vertically in a sandwich shape, and an inactive region that does not contribute to vibration is fixed to a fixed substrate 22. Note that the fixed substrate 22, the vibration plate 15, the flow path substrate 11, and the nozzle plate 14 are integrally fixed via a head case 23.

  The head case 23 is provided with an introduction path 24 connected to the manifold 17 and to the supply member 3. Ink from a liquid supply source (not shown) such as an ink cartridge or an ink tank is supplied to the manifold 17 via the supply member 3 and the introduction path 24 and is distributed to each pressure generating chamber 12 via the ink supply port 16. Is done. Actually, the piezoelectric element 18 is contracted by applying a voltage to the piezoelectric element 18. As a result, the diaphragm 15 is deformed together with the piezoelectric element 18 (upwardly in the drawing), the volume of the pressure generating chamber 12 is expanded, and ink is drawn into the pressure generating chamber 12. Then, after filling the inside with ink until the nozzle opening 13 is reached, the voltage applied to the electrode forming materials 20 and 21 of the piezoelectric element 18 is released in accordance with the recording signal from the recording head driving circuit. It is expanded and returns to the original state. As a result, the vibration plate 15 is also displaced to return to the original state, so that the pressure generating chamber 12 is contracted, the internal pressure is increased, and an ink droplet is ejected from the nozzle opening 13. That is, in the present embodiment, the longitudinal vibration type piezoelectric element 18 is provided as a pressure generating means for causing a pressure change in the pressure generating chamber 12.

  As shown in FIG. 2, the supply member 3 includes a first supply member 30 provided on the head body 2 side, a second supply member 31 connected to a storage unit (not shown), the first supply member 30, and the second supply member 3. And a filter 32 sandwiched between the supply member 31.

  A supply member flow path 34 that is a flow path through which ink flows is provided inside the supply member 3, and the filter 32 is provided across the supply member flow path 34.

  As such a filter 32, for example, a sheet shape in which a plurality of fine holes are formed by finely weaving metal, or a plate shape such as a single metal plate or a resin plate in which a plurality of through holes are formed. A member, a nonwoven fabric, etc. can be used. The filter 32 removes bubbles and foreign matters in the ink flowing through the supply member 3.

  The supply member flow path 34 provided in the supply member 3 opens to a filter chamber 35 that is a space for holding the filter 32 and a ceiling 36 that is a surface facing the filter 32 on the upstream side of the filter chamber 35. A supply path 38 having a supply port 37 and an introduction communication path 39 that opens to the bottom surface of the filter chamber 35 are provided.

  Further, the filter chamber 35 is partitioned by the filter 32 so that the upstream filter chamber 40 is provided on the upstream side (supply path 38 side) and the downstream filter chamber provided on the downstream side (introduction communication passage 39 side) of the filter 32. 41.

  Ink from the liquid introduction source is supplied to the upstream filter chamber 40 via the supply path 38. The ink that has passed through the filter 32 is stored in the downstream filter chamber 41 and supplied to the head main body 2 through the introduction communication path 39.

  The supply path 38 has a supply port 37 having one end opened to the ceiling 36 of the filter chamber 35, that is, the surface opposite to the filter 32 of the upstream filter chamber 40, and the other end of an ink cartridge, an ink tank, or the like (not shown). It is provided in communication with the liquid supply source.

  One end of the introduction communication path 39 opens to the bottom surface of the filter chamber 35, that is, the surface opposite to the filter 32 of the downstream filter chamber 41, and the other end communicates with the introduction path 24 of the head body 2.

  Such a supply member 3 is disposed such that the supply port 37 is positioned on the upper side in the vertical direction with respect to the filter 32. That is, the upstream filter chamber 40 constituting the filter chamber 35 is disposed on the upper side in the vertical direction, and the downstream filter chamber 41 is disposed on the lower side in the vertical direction. In the present embodiment, the supply member 3 is arranged so that the filter 32 is positioned in the horizontal direction and the surface direction of the side wall defining the filter chamber 35 coincides with the vertical direction.

Then, the inner diameter d of the minimum width d2 / supply port 37 of the minimum width _{d 2} ratio (ceiling 36 of the ceiling 36 to the inner diameter _{d 1} of the supply port 37 which opens in such a ceiling 36 side of the supply passage 38 of the supply member 3 ₁ ) is 6.25 or more. In the present embodiment, the inner diameter d ₁ of the supply port 37 is preferably 1.6 mm or less, and the minimum width d ₂ of the ceiling 36 is preferably 10 mm or more. If the upstream filter chamber 40 is provided with the same width in the vertical direction as in the present embodiment, the filter 32 is provided over the width of the ceiling 36 (minimum width d ₂ ). the minimum width d _2, the filter 32 is equal to the minimum width of the effective area for trapping bubbles or foreign matters. In the present embodiment, the inner diameter d ₁ of the supply port 37 is 1.6 mm, the ceiling 36 is 10 mm × 13.6 mm, the ratio between them is 6.25, and the filter 32 is 10.2 mm × 13. A rectangular shape of 8 mm was used.

By defining the inner diameter d ₁ of the supply port 37 and the minimum width d ₂ of the ceiling 36 in this manner, the ceiling 36 side of the filter chamber 35 becomes a bubble reservoir 42 in which bubbles stay.

  Further, the angle θ of the ceiling 36 of the filter chamber 35 from the supply port 37 toward the side wall of the filter chamber 35 is 90 degrees or more with respect to the vertical direction. In the present embodiment, the angle θ of the region from the supply port 37 of the ceiling 36 toward the side wall of the filter chamber 35 is 90 degrees. In the present embodiment, the filter chamber 35 has a side wall provided along the vertical direction, so the angle between the side wall and the ceiling 36 is 90 degrees. That is, when the side wall of the filter chamber 35 is provided along the vertical direction as in this embodiment, the angle θ of the region from the supply port 37 of the ceiling 36 toward the side wall of the filter chamber 35 is 90 degrees or more. Thus, the angle between the side wall and the ceiling 36 is 90 degrees or less.

  Here, the behavior of ink and bubbles of the supply member 3 will be described. 3-4 is sectional drawing which shows the behavior of the bubble of a supply member.

  As shown in FIG. 3A, when the ink A is supplied to the supply member 3, the bubbles B contained in the ink move upward in the vertical direction by buoyancy, and the ceiling 36 of the filter chamber 35 (upstream filter chamber 40). The gas layer C (gas layer C) is formed by staying on the side. In the present embodiment, the region where the gas layer C is formed is the air reservoir 42.

  When ink is ejected from the nozzle openings 13 of the head body 2, as shown in FIG. 3B, ink from a liquid supply source (not shown) flows from the supply port 37 to the inner wall surface (ceiling 36) of the filter chamber 35. And is supplied to the filter chamber 35 through the side surface and passes through the filter 32 to be supplied to the head body 2.

Further, a suction operation for sucking ink from the nozzle openings 13 of the head body 2 is performed. Specifically, for example, the nozzle opening 13 is covered with a cap member (not shown), and the inside of the cap member is set to a negative pressure, whereby the ink in the head body 2 is sucked from the nozzle opening 13. When this suction operation is performed, as shown in FIG. 4A, the ink A is supplied to the filter chamber 35 through the gas layer C from the supply port 37 toward the bottom (filter 32). That is, the ink A can be supplied through the gas layer C without moving the bubbles B (gas layer C) staying in the bubble reservoir 42 of the filter chamber 35 to the filter 32 side with the flow of the ink A. . In this way, in order to supply the ink A through the gas layer C into the filter chamber 35, as described above, the inner diameter d ₁ of the supply port 37, the minimum width d ₂ of the ceiling 36, and the vertical of the ceiling 36. An angle θ with respect to the direction is defined. That is, when the inner diameter of the supply port 37 is larger than 1.6 mm, the area where the ink supplied to the filter chamber 35 presses the bubbles (gas layer C) is widened, and the flow velocity is decreased to reduce the bubbles (gas layer C). ) Moves to the filter 32 side. When the bubbles (gas layer C) move to the filter 32 side in this way, the filter 32 is covered by the moved bubbles (gas layer C), reducing the effective area of the filter 32, and bubbles passing through the filter 32 It stays in the head body 2 and causes problems such as supply failure and discharge failure. Further, if the minimum width of the ceiling 36 is smaller than 10 mm, the area of the bubble reservoir 42 is also reduced, the remaining bubbles are reduced, and the bubbles are moved to the filter 32 side by the ink supplied from the supply port 37. End up. That is, by setting (minimum width d _{2 of the} ceiling 36) / (inner diameter d ₁ of the supply port 37) ≧ 6.25, the bubbles B (gas layer C) staying in the bubble reservoir 42 of the filter chamber 35 are removed from the ink. The ink A can be supplied through the gas layer C without being moved to the filter 32 side by the flow of A. Incidentally, the provisions of the ratio of the minimum width d ₂ of the inner diameter d ₁ and the ceiling 36 of the supply port 37 of the present embodiment, the viscosity of the ink is the case below 3 cSt.

  Further, the angle from the supply port 37 of the ceiling 36 of the filter chamber 35 toward the side wall of the filter chamber 35 is 90 degrees or more with respect to the vertical direction, so that bubbles (gas layer C) are formed in the bubble reservoir 42 on the ceiling 36 side. ) Is likely to stay, and bubbles (gas layer C) staying on the ceiling 36 side are prevented from covering the filter 32.

  Note that the bubbles (gas layer C) staying in the filter chamber 35 (upstream filter chamber 40) will gradually grow by the bubbles B contained in the ink and choke the filter 32 as it is. When it becomes a predetermined size, it is necessary to discharge the gas layer C bubbles. The method for discharging the bubbles is not particularly limited. For example, as shown in FIG. 4B, air is collected by performing so-called choke cleaning in which suction is performed from the nozzle opening 13 with the supply path 38 closed. The bubbles (gas layer C) staying in the portion 42 can pass through the filter 32 and be discharged from the nozzle opening 13 together with the ink.

(Embodiment 2)
FIG. 5 is a cross-sectional view of a supply member according to Embodiment 2 of the present invention. In addition, the same code | symbol is attached | subjected to the member similar to Embodiment 1 mentioned above, and the overlapping description is abbreviate | omitted.

  As shown in FIG. 5, the supply member 3 </ b> A constituting the ink jet recording head 1 of the present embodiment includes a first supply member 30, a second supply member 31 </ b> A, and a filter 32.

  Further, the supply member 3A is provided with a filter chamber 35A including an upstream filter chamber 40A and a downstream filter chamber 41, a supply path 38, and an introduction communication path 39.

  A surface of the filter chamber 35 </ b> A facing the filter 32 is provided with a protruding portion 43 that protrudes from the filter chamber 35, and the supply port of the supply path 38 is provided at the protruding end surface 44 of the protruding portion 43. 37A opens.

  By this protrusion 43, the ceiling 36A of the filter chamber 35A of the present embodiment is constituted by an end surface 44 of the protrusion 43 and a surface 45 between the protrusion 43 and the side wall of the filter chamber 35A.

  And also about this ceiling 36A, the angle with respect to the vertical direction which goes to the side wall from the supply port 37A of the ceiling 36A of the filter chamber 35A is 90 degrees or more. Incidentally, a surface (step surface) provided along the vertical direction is formed between the end surface 44 and the surface 45 constituting the ceiling 36A, and this step surface faces the side wall from the supply port 37A. Therefore, it is formed at 180 degrees with respect to the vertical direction, and is included in the prescribed range of 90 degrees or more.

  Further, the bubble reservoir 42A of the present embodiment is an area between the protrusion 43 and the side wall of the filter chamber 35A when the bubble is in an initial state. When the bubble grows large, it is formed on the end surface 44 of the protrusion 43. The entire ceiling 36A including the regions that face each other is obtained.

  That is, in the initial state where the bubbles are not growing, as shown in FIG. 5, the bubbles D stay around the protruding portion 43 of the ceiling 36A. The bubble D grows to form a continuous bubble layer (gas layer) under the protrusion 43. However, since the protrusion 43 exists, the bubbles below the protrusion 43 are relatively thin, and the ink supplied from the supply port 37A can easily penetrate.

(Embodiment 3)
FIG. 6 is a cross-sectional view of a supply member according to Embodiment 3 of the present invention. In addition, the same code | symbol is attached | subjected to the member similar to Embodiment 1 mentioned above, and the overlapping description is abbreviate | omitted.

  As shown in FIG. 6, the supply member 3 </ b> B constituting the ink jet recording head 1 of the present embodiment includes a first supply member 30, a second supply member 31 </ b> B, and a filter 32.

  The supply member 3B is provided with a filter chamber 35B composed of an upstream filter chamber 40B and a downstream filter chamber 41, a supply path 38 having a supply port 37, and an introduction communication path 39.

  The ceiling 36B, which is a surface facing the filter 32 of the filter chamber 35B, has an angle θ ′ with respect to the vertical direction from the supply port 37 toward the side wall of the filter chamber 35B larger than 90 degrees.

  In addition, when the bubbles are in the initial state, the bubble reservoir portion 42B of the present embodiment becomes a corner region between the ceiling 36B of the filter chamber 35B and the side wall. It becomes all the areas that face each other.

  That is, in the initial state where the bubbles are not growing, as shown in FIG. 6, the bubbles D stay at the corners of the side wall of the ceiling 36B. The bubble D grows to form a continuous bubble layer (gas layer) under the supply port 37. However, since the opening edge of the supply port 37 has an acute angle, the bubble (gas layer) under the supply port 37 is relatively thin, and the ink supplied from the supply port 37 can easily penetrate. ing.

(Other embodiments)
As mentioned above, although each embodiment of this invention was described, the basic composition of this invention is not limited to what was mentioned above.

  For example, in each of the embodiments described above, the supply members 3 to 3B are arranged so that the side walls of the filter chambers 35 to 35B are along the vertical direction, but the supply ports 37 and 37A are on the upper side in the vertical direction with respect to the filter 32. If it is arrange | positioned in this, it will not specifically limit to this. Here, another arrangement of the supply member will be described with reference to FIG. FIG. 7 is a cross-sectional view showing a supply member according to another embodiment.

  As shown in FIG. 7, the supply member 3 </ b> C includes a first supply member 30 </ b> A, a second supply member 31 </ b> C, and a filter 32.

  In addition, the supply member 3C is provided with a filter chamber 35C including an upstream filter chamber 40C and a downstream filter chamber 41A, a supply path 38 having a supply port 37, and an introduction communication path 39.

  The side wall of the filter chamber 35C is provided to be inclined with respect to the vertical direction. The ceiling 36C, which is the surface of the filter chamber 35C that faces the filter 32, has an angle θ of 90 degrees or more with respect to the vertical direction from the supply port 37 toward the side wall of the filter chamber 35C. Yes. In the supply member 3C configured as described above, bubbles contained in the ink stay on the ceiling 36C side to form the gas layer C. However, since the ceiling 36C is provided horizontally with respect to the vertical direction, the gas layer C is formed over the entire surface of the ceiling 36C. Thereby, the ink supplied from the supply port 37 is supplied through the gas layer C.

  Further, in each of the above-described embodiments, the longitudinal vibration type piezoelectric element 18 has been described as the pressure generating means for causing the pressure change in the pressure generating chamber 12, but the present invention is not particularly limited thereto. For example, the pressure generating chamber On the other hand, a flexural vibration type piezoelectric element in which a lower electrode, a piezoelectric layer, and an upper electrode are sequentially laminated can be used. Also, as a pressure generating means, a heating element is arranged in the pressure generating chamber, and droplets are discharged from the nozzle opening by bubbles generated by the heat generated by the heating element, or static electricity is generated between the diaphragm and the electrode. Thus, a so-called electrostatic actuator that discharges liquid droplets from the nozzle openings by deforming the diaphragm by electrostatic force can be used.

  In addition, the ink jet recording head 1 of each of the embodiments constitutes a part of an ink jet recording head unit including an ink flow path communicating with an ink cartridge and the like, and is mounted on the ink jet recording apparatus. FIG. 8 is a schematic view showing an example of the ink jet recording apparatus.

  In the ink jet recording apparatus I shown in FIG. 8, an ink jet recording head unit 101 having a plurality of ink jet recording heads 1 (hereinafter also referred to as head unit 101) is detachable from cartridges 102A and 102B constituting ink supply means. The carriage 103 on which the head unit 101 is mounted is provided on a carriage shaft 105 attached to the apparatus main body 104 so as to be axially movable. For example, the head unit 101 discharges a black ink composition and a color ink composition, respectively.

  Then, the driving force of the driving motor 106 is transmitted to the carriage 103 via a plurality of gears and timing belt 107 (not shown), so that the carriage 103 on which the head unit 101 is mounted is moved along the carriage shaft 105. On the other hand, the apparatus main body 104 is provided with a platen 108 along the carriage shaft 105, and a recording sheet S, which is a recording medium such as paper fed by a paper feed roller (not shown), is wound around the platen 108. It is designed to be transported.

  Further, in the non-printing area of the ink jet recording apparatus I, a suction unit 110 that sucks ink, bubbles, and the like in the flow path from the nozzle openings 13 of the recording head 1 is provided.

  The suction unit 110 includes a cap member 111 that covers the nozzle openings 13 of the recording head 1, and a suction device 113 such as a vacuum pump connected to the cap member 111 via a tube 112.

  The suction means 110 having such a configuration causes the nozzle member 13 to have a negative pressure inside the cap member 111 by causing the suction device 113 to perform a suction operation by bringing the cap member 111 into contact with the ejection surface of the recording head 1. Then, the ink in the flow path is sucked together with bubbles to perform cleaning. Further, during printing suspension, the nozzle opening 13 may be sealed by the cap member 111 to suppress drying of the nozzle opening 13.

  In the ink jet recording apparatus I described above, the ink jet recording head 1 (head unit 101) is mounted on the carriage 103 and moves in the main scanning direction. However, the present invention is not particularly limited thereto. The present invention can also be applied to a so-called line-type recording apparatus in which the recording head 1 is fixed and printing is performed simply by moving the recording sheet S such as paper in the sub-scanning direction.

  In the above example, the head unit 101 having a plurality of recording heads 1 is mounted on the ink jet recording apparatus I. However, each recording unit 1 may be mounted on each head unit 101. In addition, one or a plurality of recording heads 1 may be directly mounted on the ink jet recording apparatus I.

  In the above-described embodiment, an ink jet recording head has been described as an example of a liquid ejecting head. However, the present invention is widely intended for all liquid ejecting heads and ejects liquids other than ink. Of course, the present invention can also be applied to a liquid ejecting head. Other liquid ejecting heads include, for example, various recording heads used in image recording apparatuses such as printers, color material ejecting heads used in the manufacture of color filters such as liquid crystal displays, organic EL displays, and FEDs (field emission displays). Examples thereof include an electrode material ejection head used for electrode formation, a bioorganic matter ejection head used for biochip production, and the like.

DESCRIPTION OF SYMBOLS I Inkjet recording device (liquid ejecting apparatus), 1 Inkjet recording head (liquid ejecting head), 2 Head main body, 3, 3A, 3B, 3C supply member, 11 Flow path substrate, 13 Nozzle opening, 17 Manifold, 18 Piezoelectric Element, 30, 30A First supply member, 31, 31A, 31B, 31C Second supply member, 32 Filter, 35, 35A, 35B, 35C Filter chamber, 36, 36A, 36B, 36C Ceiling, 37, 37A Supply port, 101 Inkjet recording head unit (liquid ejecting head unit), 110 Suction means

Claims (6)

A head body provided with a nozzle opening for ejecting liquid;
A supply member that supplies liquid from a liquid supply source to the head body,
The supply member has a filter chamber provided with a filter therein, a supply port that opens on a ceiling side facing the filter in the filter chamber, and a supply path that supplies liquid to the filter chamber; A bubble retention part that is provided on the ceiling side of the filter chamber and retains bubbles,
The supply port is provided on the upper side in the vertical direction with respect to the filter,
The ratio of the minimum width of the ceiling to the inner diameter of the supply port opened on the ceiling side of the supply path is 6.25 or more.   The liquid ejecting head according to claim 1, wherein an angle from the supply port of the ceiling toward a side wall of the filter chamber is 90 degrees or more with respect to a vertical direction.   The liquid ejecting head according to claim 1, wherein the supply port opens at an end surface of a projecting portion that projects from the ceiling to the filter side.   A liquid ejecting head unit comprising a plurality of liquid ejecting heads according to claim 1.   A liquid ejecting apparatus comprising the liquid ejecting head unit according to claim 4.   A liquid ejecting apparatus comprising the liquid ejecting head according to claim 1.

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