JP2019155834A - Liquid discharge head, liquid discharge unit, and liquid discharging device - Google Patents

Abstract

To suppress contamination of a foreign matter into a head and to reduce variation in discharging property due to air bubble retention.SOLUTION: A liquid discharge head comprises: plural nozzles 4 which discharge a liquid; plural individual liquid chambers 6 which are corresponding to and are communicated with the plural nozzles 4; a supply side filter 91 which is disposed between a supply channel 41 and a supply side common channel 10 which are communicated with the plural individual liquid chambers 6; and a recovery side filter 92 which is disposed in a recovery channel 42 which is communicated with the plural individual liquid chambers 6. A bore diameter of a filter bore 92a of the recovery side filter 92 is larger than a bore diameter of a filter bore 91a of the supply side filter 91.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a liquid discharge head, a liquid discharge unit, and an apparatus for discharging liquid.

  As a liquid discharge head for discharging liquid, an individual liquid chamber circulation type head that circulates liquid through an individual liquid chamber (also referred to as a pressure chamber) is known.

  2. Description of the Related Art Conventionally, a common channel circulation type head is known in which a filter is arranged at each of a supply port to a common channel communicating with a plurality of nozzles and a recovery port from the common channel (Patent Document 1).

JP 2011-213030 A

  However, when a filter is arranged on the recovery side, when bubbles are generated in the flow path inside the head, the bubbles stay in the recovery side filter. In particular, in the individual liquid chamber circulation type head, the discharge characteristics vary among the nozzles. There is a problem.

  The present invention has been made in view of the above-described problems, and an object thereof is to reduce variation in ejection characteristics due to bubble retention.

In order to solve the above-described problem, a liquid discharge head according to the present invention includes:
A plurality of nozzles for discharging liquid;
Individual liquid chambers respectively communicating with the plurality of nozzles;
A supply-side filter disposed in a supply-side flow path leading to the individual liquid chamber;
A recovery-side filter disposed in a recovery-side flow path leading to the individual liquid chamber,
The hole diameter of the collection side filter is larger than the hole diameter of the supply side filter.

  According to the present invention, it is possible to reduce variations in ejection characteristics due to bubble retention.

FIG. 3 is an external perspective view illustrating an example of a liquid discharge head according to the present invention. It is sectional explanatory drawing of the direction orthogonal to the nozzle arrangement direction of the head. FIG. 6 is a cross-sectional explanatory diagram along a direction orthogonal to a nozzle arrangement direction of a liquid ejection head according to a second embodiment of the present invention. FIG. 10 is an explanatory cross-sectional view along a direction orthogonal to a nozzle arrangement direction of a liquid ejection head according to a third embodiment of the present invention. It is a schematic explanatory drawing of an example of the apparatus which discharges the liquid which concerns on this invention. It is a plane explanatory view of an example of a head unit of the device. It is a block explanatory view of an example of a liquid circulation device. It is principal part plane explanatory drawing of the other example of the apparatus which discharges the liquid which concerns on this invention. It is principal part side explanatory drawing of the apparatus. It is principal part plane explanatory drawing of the other example of the liquid discharge unit which concerns on this invention. It is front explanatory drawing of the further another example of the liquid discharge unit which concerns on this invention.

  Embodiments of the present invention will be described below with reference to the accompanying drawings. A first embodiment of the present invention will be described with reference to FIGS. FIG. 1 is an explanatory perspective view of the appearance of the liquid ejection head according to the embodiment, and FIG. 2 is a cross-sectional explanatory view along a direction orthogonal to the nozzle arrangement direction of the head.

  In the liquid discharge head 100, a nozzle plate 1, a flow path plate 2, and a vibration plate member 3 as a wall surface member are laminated and joined. Between the piezoelectric actuator 11 that displaces the vibration region (vibration plate) 30 of the diaphragm member 3, the common flow path member 20 that also serves as the frame member of the head, and between the vibration plate member 3 and the common flow path member 20. And a filter member 90 interposed therebetween.

  The nozzle plate 1 has a plurality of nozzles 4 that discharge liquid.

  The flow path plate 2 includes a plurality of individual liquid chambers 6 that communicate with the plurality of nozzles 4 via the nozzle communication passages 5, a plurality of supply-side fluid resistance units 7 that respectively communicate with the plurality of individual liquid chambers 6, and 1 or 2. As described above, one or a plurality of supply-side liquid introduction portions 8 that communicate with the supply-side fluid resistance portion 7 are formed. The supply side liquid introduction part 8 communicates with the supply side common flow path 10 through the supply side opening 9 of the diaphragm member 3.

  In this embodiment, the supply flow path 41 is constituted by the supply side opening 9, the supply side liquid introduction part 8 and the supply side fluid resistance part 7, and the supply side flow path is constituted by the supply flow path 41 and the supply side common flow path 10. It is composed. In the present embodiment, the flow path plate 2 is formed by laminating a plurality of plate-like members 2A to 2E, but is not limited thereto.

  The vibration plate member 3 has a deformable vibration region 30 that forms the wall surface of the individual liquid chamber 6 of the flow path plate 2. Here, the diaphragm member 3 has a two-layer structure (not limited), and is formed of a first layer that forms a thin portion and a second layer that forms a thick portion from the flow path plate 2 side. A deformable vibration region 30 is formed in a portion corresponding to the individual liquid chamber 6.

  Then, on the opposite side of the diaphragm member 3 from the individual liquid chamber 6, a piezoelectric actuator 11 including an electromechanical conversion element as drive means (actuator means, pressure generating means) for deforming the vibration region 30 of the diaphragm member 3 is provided. It is arranged.

  The piezoelectric actuator 11 has grooves formed in a piezoelectric member by half-cut dicing to form a required number of columnar piezoelectric elements 12 in a comb shape at a predetermined interval. The piezoelectric element 12 is bonded to the vibration region (vibration plate) 30 of the vibration plate member 3.

  The flow path plate 2 includes a plurality of individual recovery flow paths 56 along the surface direction of the flow path plate 2 that respectively communicate with the plurality of individual liquid chambers 6 via the nozzle communication paths 5 and one or more individual recovery flows. One or a plurality of recovery side liquid lead-out portions 58 communicating with the passage 56 are formed. The recovery-side liquid lead-out portion 58 communicates with the recovery-side common flow channel 50 via the recovery-side opening 59 of the diaphragm member 3.

  In the present embodiment, the individual recovery channel 56, the recovery side liquid outlet 58, and the recovery side opening 59 constitute the recovery channel 42. Further, the recovery flow path 42 and the recovery side common flow path 50 constitute a recovery side flow path.

  The common flow path member 20 forms a supply-side common flow path 10 that communicates with the supply flow path 41 and a recovery-side common flow path 50 that communicates with the recovery flow path 42. The supply-side common flow channel 10 communicates with the supply port 71, and the recovery-side common flow channel 50 communicates with the collection port 72.

  In the liquid discharge head 100 configured as described above, for example, the voltage applied to the piezoelectric element 12 is lowered from the reference potential (intermediate potential), so that the piezoelectric element 12 contracts, and the vibration region 30 of the diaphragm member 3 is drawn to individually. As the volume of the liquid chamber 6 expands, the liquid flows into the individual liquid chamber 6.

  Thereafter, the voltage applied to the piezoelectric element 12 is increased to extend the piezoelectric element 12 in the stacking direction, and the vibration region 30 of the diaphragm member 3 is deformed in the direction toward the nozzle 4 to contract the volume of the individual liquid chamber 6. As a result, the liquid in the individual liquid chamber 6 is pressurized, and the liquid is discharged from the nozzle 4.

  Further, the liquid that is not discharged from the nozzle 4 passes through the nozzle 4 and is collected from the individual collection flow path 56 to the collection side common flow path 50, and from the collection side common flow path 50 to the supply side common flow path 10 through the external circulation path. Will be supplied again.

  Note that the driving method of the head is not limited to the above example (drawing-pushing), and it is also possible to perform striking or pushing depending on the direction to which the drive waveform is given.

  Next, the filter configuration in the first embodiment will be described.

  In the present embodiment, a filter member 90 is provided between the diaphragm member 3 and the common flow path member 20. In the filter member 90, a supply-side filter 91 is formed between the supply-side common flow path 10 and the supply flow path 41, here, upstream of the supply-side opening 9.

  Further, a recovery side filter 92 is formed in the supply side liquid outlet portion 58 of the recovery flow path 42 in the plate-like member 2B constituting the flow path plate 2.

  Here, the opening area of the filter hole 92 a of the recovery side filter 92 is made larger than the opening area of the filter hole 91 a of the supply side filter 91. For example, when the nozzle diameter Dn of the nozzle 4 is 20 μm, the hole diameter D1 of the filter hole 91a of the supply side filter 91 is 15 μm, and the hole diameter D2 of the filter hole 92a of the recovery side filter 92 is 19 μm (Dn <D1 <D2 ).

  In the present embodiment, a supply-side filter 91 and a recovery-side filter 92 each having a filter hole diameter smaller than the nozzle diameter of the nozzle 4 are arranged upstream and downstream of the arrangement position of the nozzle 4. As a result, it is possible to prevent foreign matter from entering the nozzle 4 during production and assembly. On the other hand, fine bubbles and fine foreign matter that have passed through the supply-side filter 91 and the collection-side filter 92 can be discharged from the nozzle 4, so that there is no effect.

  Further, when the liquid is discharged from the nozzle 4 by driving the piezoelectric actuator 11 to pressurize the liquid in the individual liquid chamber 6, the air dissolved in the liquid in the individual liquid chamber 6 is microbubbled by cavitation. There are things to do.

  In this case, the bubbles that have passed through the supply-side filter 91 and the microbubbles generated by cavitation are combined, and the bubbles may grow large and reach the recovery-side filter 92 without being discharged from the nozzle 4.

  Here, when the bubbles cannot pass through the collection side filter 92, the bubbles stay on the upstream side of the collection side filter 92 and clogging occurs.

  Therefore, since the hole diameter D2 of the filter hole 92a of the recovery side filter 92 is larger than the hole diameter D1 of the filter hole 91a of the supply side filter 91, bubbles larger than the nozzle diameter of the nozzle 4 also pass through the recovery side filter 92. Thus, it can be discharged to the recovery side common flow path 50.

  Thereby, mixing of a foreign material can be prevented and clogging due to bubbles can be reduced.

  Next, a second embodiment of the present invention will be described with reference to FIG. FIG. 3 is an explanatory cross-sectional view along a direction orthogonal to the nozzle arrangement direction of the liquid ejection head according to the embodiment.

  In the present embodiment, the filter member 90 forms the supply side filter 91 and the recovery side filter 92.

  Thus, by arranging the supply-side filter 91 and the collection-side filter 92 on the same plane, it is possible to save parts cost, manufacturing cost, and space saving of the head.

  Next, a third embodiment of the present invention will be described with reference to FIG. FIG. 4 is a cross-sectional explanatory diagram along a direction orthogonal to the nozzle arrangement direction of the liquid ejection head according to the embodiment.

  In the present embodiment, a supply side filter 91 and a recovery side filter 92 are formed by the diaphragm member 3.

  As described above, the supply-side filter 91 and the collection-side filter 92 are also used as the diaphragm member, so that further component cost, manufacturing cost, and space saving of the head can be achieved.

  Next, an example of an apparatus for ejecting liquid according to the present invention will be described with reference to FIGS. FIG. 5 is a schematic explanatory view of the apparatus, and FIG. 6 is a plan explanatory view of an example of a head unit of the apparatus.

  The printing apparatus 500, which is a device for discharging the liquid, includes a carry-in means 501 for carrying in the continuous body 510, a guide carrying means 503 for guiding and carrying the continuous body 510 carried from the carry-in means 501 to the printing means 505, and a continuous body. A printing unit 505 that performs printing to form an image by discharging a liquid to 510, a drying unit 507 that dries the continuum 510, and an unloading unit 509 that unloads the continuum 510 are provided.

  The continuous body 510 is fed out from the original winding roller 511 of the carry-in means 501, guided and conveyed by the rollers of the carry-in means 501, the guide conveyance means 503, the drying means 507, and the carry-out means 509, and the take-up roller 591 of the carry-out means 509. It is wound up by.

  The continuous member 510 is transported on the transport guide member 559 by the printing unit 505 so as to face the head unit 550 and the head unit 555, and an image is formed by the liquid ejected from the head unit 550. Post-processing is performed with the processing liquid.

  Here, the head unit 550 includes, for example, full-line head arrays 551A, 551B, 551C, and 551D for four colors from the upstream side in the transport direction (hereinafter referred to as “head array 551” when colors are not distinguished). Is arranged.

  Each head array 551 is a liquid ejecting unit, and ejects black K, cyan C, magenta M, and yellow Y liquids to the transported continuous body 510, respectively. The type and number of colors are not limited to this.

  For example, as shown in FIG. 6, the head array 551 is configured by arranging liquid ejection heads (which are also simply referred to as “heads”) 100 in a staggered manner on a base member 552. Absent.

  Next, an example of the liquid circulation device will be described with reference to FIG. FIG. 7 is a block diagram of the circulation device. Although only one head is illustrated here, when a plurality of heads are arranged, a supply-side liquid path and a recovery-side liquid path are respectively provided on the supply side and the recovery side of the plurality of heads via a manifold or the like. Will be connected.

  The liquid circulation device 600 includes a supply tank 601, a recovery tank 602, a main tank 603, a first liquid feed pump 604, a second liquid feed pump 605, a compressor 611, a regulator 612, a vacuum pump 621, a regulator 622, and a supply side pressure sensor 631. And a recovery-side pressure sensor 632.

  Here, the compressor 611 and the vacuum pump 621 constitute means for generating a differential pressure between the pressure in the supply tank 601 and the pressure in the recovery tank 602.

  The supply-side pressure sensor 631 is connected between the supply tank 601 and the head 100 and connected to a supply-side liquid path connected to the supply port 71 of the head 100. The recovery side pressure sensor 632 is connected between the head 1 and the recovery tank 602 and is connected to a recovery side liquid path connected to the recovery port 72 of the head 100.

  One of the recovery tanks 602 is connected to the supply tank 601 via the first liquid feed pump 604, and the other of the recovery tanks 602 is connected to the main tank 603 via the second liquid feed pump 605.

  As a result, the liquid flows from the supply tank 601 through the supply port 71 into the head 100 and is recovered from the recovery port 72 to the recovery tank 602, and the liquid is supplied from the recovery tank 602 to the supply tank 601 by the first liquid feed pump 604. By being sent, a circulation path through which the liquid circulates is configured.

  Here, a compressor 611 is connected to the supply tank 601 and is controlled so that a predetermined positive pressure is detected by the supply-side pressure sensor 631. On the other hand, a vacuum pump 621 is connected to the recovery tank 602 and is controlled so that a predetermined negative pressure is detected by the recovery side pressure sensor 632.

  Thereby, the negative pressure of the meniscus can be kept constant while circulating the liquid through the head 100.

  Further, when liquid is discharged from the nozzle 4 of the head 100, the amount of liquid in the supply tank 601 and the recovery tank 602 decreases. Therefore, the liquid is replenished from the main tank 603 to the recovery tank 602 using the second liquid feeding pump 605 as appropriate.

  The liquid replenishment timing from the main tank 603 to the recovery tank 602 is provided in the recovery tank 602 such that liquid replenishment is performed when the liquid level in the recovery tank 602 falls below a predetermined level. It can be controlled by the detection result of a liquid level sensor or the like.

  Next, another example of a printing apparatus as an apparatus for ejecting a liquid according to the present invention will be described with reference to FIGS. FIG. 8 is an explanatory plan view of the main part of the apparatus, and FIG. 9 is an explanatory side view of the main part of the apparatus.

  The printing apparatus 500 is a serial type apparatus, and the carriage 403 is reciprocated in the main scanning direction by the main scanning moving mechanism 493. The main scanning movement mechanism 493 includes a guide member 401, a main scanning motor 405, a timing belt 408, and the like. The guide member 401 spans the left and right side plates 491A and 491B and holds the carriage 403 so as to be movable. The carriage 403 is reciprocated in the main scanning direction by the main scanning motor 405 via the timing belt 408 spanned between the driving pulley 406 and the driven pulley 407.

  The carriage 403 is equipped with a liquid discharge unit 440 in which the liquid discharge head 100 and the head tank 441 according to the present invention are integrated. The liquid discharge head 100 of the liquid discharge unit 440 discharges, for example, yellow (Y), cyan (C), magenta (M), and black (K) liquids. Further, the liquid ejection head 100 is mounted with a nozzle row composed of a plurality of nozzles arranged in the sub-scanning direction orthogonal to the main scanning direction, and the ejection direction facing downward.

  The liquid discharge head 100 is connected to the liquid circulation device 600 described above, and a liquid of a required color is circulated and supplied.

  The printing apparatus 500 includes a transport mechanism 495 for transporting the paper 410. The transport mechanism 495 includes a transport belt 412 serving as transport means, and a sub-scanning motor 416 for driving the transport belt 412.

  The conveyance belt 412 adsorbs the sheet 410 and conveys it at a position facing the liquid ejection head 100. The transport belt 412 is an endless belt and is stretched between the transport roller 413 and the tension roller 414. The adsorption can be performed by electrostatic adsorption or air suction.

  The transport belt 412 rotates in the sub-scanning direction when the transport roller 413 is rotationally driven by the sub-scanning motor 416 via the timing belt 417 and the timing pulley 418.

  Further, on one side of the carriage 403 in the main scanning direction, a maintenance / recovery mechanism 420 that performs maintenance / recovery of the liquid ejection head 100 is disposed on the side of the transport belt 412.

  The maintenance / recovery mechanism 420 includes, for example, a cap member 421 for capping the nozzle surface (surface on which the nozzle is formed) of the liquid ejection head 100, a wiper member 422 for wiping the nozzle surface, and the like.

  The main scanning movement mechanism 493, the maintenance / recovery mechanism 420, and the transport mechanism 495 are attached to a housing including the side plates 491A and 491B and the back plate 491C.

  In the printing apparatus 500 configured as described above, the paper 410 is fed and sucked onto the transport belt 412, and the paper 410 is transported in the sub-scanning direction by the circular movement of the transport belt 412.

Therefore, the liquid ejection head 100 is driven according to the image signal while moving the carriage 403 in the main scanning direction, thereby ejecting liquid onto the stopped paper 410 to form an image.

  Thus, since this apparatus includes the liquid ejection head according to the present invention, a high-quality image can be stably formed.

  Next, another example of the liquid discharge unit according to the present invention will be described with reference to FIG. FIG. 10 is an explanatory plan view of the main part of the unit.

  Of the members constituting the liquid ejection unit 440 and the device for ejecting the liquid, a casing portion composed of side plates 491A, 491B and a back plate 491C, a main scanning movement mechanism 493, a carriage 403, and a liquid The discharge head 100 is configured.

  A liquid discharge unit in which the above-described maintenance / recovery mechanism 420 is further attached to, for example, the side plate 491B of the liquid discharge unit 440 can be configured.

  Next, still another example of the liquid discharge unit according to the present invention will be described with reference to FIG. FIG. 11 is an explanatory front view of the unit.

  The liquid discharge unit 440 includes a liquid discharge head 100 to which a flow path component 444 is attached, and a tube 456 connected to the flow path component 444.

  The flow path component 444 is disposed inside the cover 442. A head tank 441 may be included instead of the flow path component 444. In addition, a connector 443 that is electrically connected to the liquid discharge head 100 is provided above the flow path component 444.

  In the present application, the liquid to be ejected is not particularly limited as long as it has a viscosity and surface tension that can be ejected from the head, and the viscosity becomes 30 mPa · s or less at room temperature, normal pressure, or by heating and cooling. It is preferable. More specifically, solvents such as water and organic solvents, colorants such as dyes and pigments, functional materials such as polymerizable compounds, resins, and surfactants, and biocompatible materials such as DNA, amino acids, proteins, and calcium. , Edible materials such as natural pigments, solutions, suspensions, emulsions, and the like. These include, for example, inkjet inks, surface treatment liquids, components of electronic devices and light emitting devices, and formation of electronic circuit resist patterns. It can be used in applications such as liquids for use, three-dimensional modeling material liquids, and the like.

  As energy generation sources for discharging liquid, piezoelectric actuators (laminated piezoelectric elements and thin film piezoelectric elements), thermal actuators using electrothermal transducers such as heating resistors, electrostatic actuators consisting of a diaphragm and counter electrode are used. To be included.

  The “liquid ejection unit” is a unit in which functional parts and mechanisms are integrated with a liquid ejection head, and includes an assembly of parts related to liquid ejection. For example, the “liquid discharge unit” includes a head tank, a carriage, a supply mechanism, a maintenance / recovery mechanism, a main scanning movement mechanism, and a liquid circulation device in which at least one of the configurations of the liquid circulation unit is combined.

  Here, the term “integrated” refers to, for example, a liquid discharge head, a functional component, and a mechanism that are fixed to each other by fastening, adhesion, engagement, etc., and one that is held movably with respect to the other. Including. Further, the liquid discharge head, the functional component, and the mechanism may be configured to be detachable from each other.

  For example, there is a liquid discharge unit in which a liquid discharge head and a head tank are integrated. Also, there are some in which the liquid discharge head and the head tank are integrated by being connected to each other by a tube or the like. Here, a unit including a filter may be added between the head tank and the liquid discharge head of these liquid discharge units.

  In addition, there is a liquid discharge unit in which a liquid discharge head and a carriage are integrated.

  In addition, there is a liquid discharge unit in which the liquid discharge head and the scanning movement mechanism are integrated by holding the liquid discharge head movably on a guide member that constitutes a part of the scanning movement mechanism. In some cases, a liquid discharge head, a carriage, and a main scanning movement mechanism are integrated.

  Also, there is a liquid discharge unit in which a cap member that is a part of the maintenance / recovery mechanism is fixed to a carriage to which the liquid discharge head is attached, and the liquid discharge head, the carriage, and the maintenance / recovery mechanism are integrated. .

  In addition, there is a liquid discharge unit in which a tube is connected to a liquid discharge head to which a head tank or a flow path component is attached, and the liquid discharge head and a supply mechanism are integrated. The liquid from the liquid storage source is supplied to the liquid discharge head via this tube.

  The main scanning movement mechanism includes a guide member alone. The supply mechanism includes a single tube and a single loading unit.

  The “apparatus for ejecting liquid” includes an apparatus that includes a liquid ejection head or a liquid ejection unit and that ejects liquid by driving the liquid ejection head. The apparatus for ejecting a liquid includes not only an apparatus capable of ejecting a liquid to an object to which the liquid can adhere, but also an apparatus for ejecting the liquid into the air or liquid.

  This “apparatus for discharging liquid” may include means for feeding, transporting, and discharging a liquid to which liquid can adhere, as well as a pre-processing apparatus and a post-processing apparatus.

  For example, as a “liquid ejecting device”, an image forming device that forms an image on paper by ejecting ink, a powder is formed in layers to form a three-dimensional model (three-dimensional model) There is a three-dimensional modeling apparatus (three-dimensional modeling apparatus) that discharges a modeling liquid onto the powder layer.

  Further, the “apparatus for ejecting liquid” is not limited to an apparatus in which significant images such as characters and figures are visualized by the ejected liquid. For example, what forms a pattern etc. which does not have a meaning in itself, and what forms a three-dimensional image are also included.

  The above-mentioned “applicable liquid” means that the liquid can be attached at least temporarily and adheres and adheres, or adheres and penetrates. Specific examples include recording media such as paper, recording paper, recording paper, film, and cloth, electronic parts such as electronic substrates and piezoelectric elements, powder layers (powder layers), organ models, and test cells. Yes, unless specifically limited, includes everything that the liquid adheres to.

  The material of the above-mentioned “material to which liquid can adhere” is not limited as long as liquid such as paper, thread, fiber, fabric, leather, metal, plastic, glass, wood, ceramics can be adhered even temporarily.

  In addition, the “device for ejecting liquid” includes a device in which the liquid ejection head and the device to which the liquid can adhere move relatively, but is not limited thereto. Specific examples include a serial type apparatus that moves the liquid discharge head, a line type apparatus that does not move the liquid discharge head, and the like.

  In addition, as the “device for ejecting liquid”, other than the above, a treatment liquid coating apparatus that ejects a treatment liquid onto a sheet in order to apply the treatment liquid to the surface of the sheet for the purpose of modifying the surface of the sheet, There is an injection granulation apparatus that granulates raw material fine particles by spraying a composition liquid in which raw materials are dispersed in a solution through a nozzle.

  Note that the terms “image formation”, “recording”, “printing”, “printing”, “printing”, “modeling” and the like in the terms of the present application are all synonymous.

DESCRIPTION OF SYMBOLS 100 Liquid discharge head 1 Nozzle plate 4 Nozzle 2 Flow path plate 3 Vibration plate member 6 Individual liquid chamber 10 Supply side common flow path 20 Common flow path member 41 Supply flow path 42 Recovery flow path 50 Recovery side common flow path 91 Supply side filter 92 Collection side filter 403 Carriage 440 Liquid discharge unit 500 Printing device (device for discharging liquid)
550 Head unit 600 Liquid circulation device

Claims (7)

A plurality of nozzles for discharging liquid;
Individual liquid chambers respectively communicating with the plurality of nozzles;
A supply-side filter disposed in a supply-side flow path leading to the individual liquid chamber;
A recovery-side filter disposed in a recovery-side flow path leading to the individual liquid chamber,
The liquid ejection head according to claim 1, wherein a hole diameter of the recovery side filter is larger than a hole diameter of the supply side filter. The liquid discharge head according to claim 1, wherein the supply side filter and the recovery side filter are disposed on the same surface. The supply side flow path includes a supply flow path communicating with the plurality of individual liquid chambers, and a supply side common flow path communicating with the plurality of individual liquid chambers via the supply flow path,
The liquid ejection head according to claim 1, wherein the supply side filter is disposed between the supply side common flow path and the supply flow path. The recovery side flow path includes a recovery flow path communicating with the plurality of individual liquid chambers, and a recovery side common flow path communicating with the plurality of individual liquid chambers via the recovery flow path,
4. The liquid ejection head according to claim 1, wherein the recovery-side filter is disposed between the recovery flow path and the recovery-side common flow path.   A liquid discharge unit comprising the liquid discharge head according to claim 1. A head tank for storing liquid to be supplied to the liquid discharge head, a carriage on which the liquid discharge head is mounted, a supply mechanism for supplying liquid to the liquid discharge head, a maintenance / recovery mechanism for maintaining and recovering the liquid discharge head, and the liquid 6. The liquid discharge unit according to claim 5, wherein the liquid discharge head is integrated with at least one of a main scanning movement mechanism that moves the discharge head in the main scanning direction.   An apparatus for ejecting liquid, comprising the liquid ejection head according to claim 1 or the liquid ejection unit according to claim 5 or 6.

Images