JP2010201734A - Liquid injection device and control method for liquid injection head - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a liquid injection device and a control method for a liquid injection head, capable of restraining favorably a temperature of a liquid from getting high, without enlarging a device. <P>SOLUTION: This liquid injection device includes an injection head 10 provided with a plurality of pressure generation chambers 11 communicated with a nozzle 13, the first pressure generation means 23 for generating a pressure change in the pressure generation chambers 11, the first liquid chamber 18 provided in one end side of the pressure generation chambers 11, the second liquid chamber 20 provided in the other end side of the pressure generation chambers 11, circulation flow passages 21 provided between the respective pressure generation chambers, and for connecting the first liquid chamber 18 and the second liquid chamber 20, and the second pressure generation means 24 provided corresponding to each circulation flow passage and for generating a pressure change in the circulation flow passage 21, and a circulation control means for driving the second pressure generation means 24 at prescribed timing, to generate the pressure change in the circulation flow passage 21, and for circulating the liquids in the first liquid chamber 18 and the second liquid chamber 20 via the circulation flow passages 21. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a liquid ejecting apparatus including a liquid ejecting head that ejects liquid droplets and a method for controlling the liquid ejecting head, and more particularly, to an ink jet recording apparatus including an ink jet recording head that ejects ink droplets as droplets and an ink jet. The present invention relates to a method for controlling a recording head.

  An ink jet recording head that is a typical example of a liquid ejecting head that ejects liquid droplets includes, for example, a flow path forming substrate in which a pressure generating chamber is formed, and a piezoelectric element provided on one side of the flow path forming substrate. In some cases, ink droplets are ejected from nozzles by applying pressure in the pressure generating chamber by the displacement of the piezoelectric element.

  In addition, such an ink jet recording head has a problem that ejection failure such as nozzle clogging occurs due to ink thickening or sedimentation due to a change in ambient environmental temperature. For this reason, there is one that performs a so-called flushing operation that discharges ink having increased viscosity by ejecting ink droplets from nozzles of an ink jet recording head at a predetermined timing, for example, at the start of printing. For example, see Patent Document 1).

  Further, for example, there is a pump provided in a circulation path connecting an ink jet recording head and an ink tank, and ink in the ink jet recording head is circulated in the circulation path by this pump at a predetermined timing ( For example, see Patent Document 2).

JP 2001-105613 A JP 2006-088492 A

  By performing the flushing operation as described in Patent Document 1, it is possible to suppress the occurrence of liquid droplet ejection defects such as nozzle clogging. However, there is a problem in that useless droplets are discharged and the running cost is increased.

  Further, as described in Patent Document 2, if the liquid is circulated by a pump or the like, thickening or the like can be suppressed without discharging useless liquid. However, there is a problem that the apparatus becomes large.

  SUMMARY An advantage of some aspects of the invention is that it provides a liquid ejecting apparatus and a liquid ejecting head control method that can satisfactorily suppress a temperature rise of a liquid without increasing the size of the apparatus. Objective.

  The present invention that solves the above-described problems includes a plurality of pressure generation chambers that communicate with a nozzle that ejects droplets, and a pressure change that is provided corresponding to each pressure generation chamber and that ejects droplets into the pressure generation chamber. A first pressure generating means for generating pressure, a first liquid chamber provided on one end side of the pressure generating chamber and communicating with each pressure generating chamber, and a second provided on the other end side of the pressure generating chamber. Liquid chambers, circulation channels provided between the pressure generation chambers to connect the first liquid chamber and the second liquid chamber, and the circulation flows provided corresponding to the circulation channels. A liquid ejecting head comprising: a second pressure generating means for generating a pressure change in the passage; and driving the second pressure generating means at a predetermined timing to cause a pressure change in the circulation flow path. Circulates the liquid in the first liquid chamber and the second liquid chamber via the circulation channel It is in the liquid-jet apparatus characterized comprising a circulation control means for the.

  In the present invention, the liquid can be circulated relatively easily between the first liquid chamber and the second liquid chamber at a predetermined timing. Thereby, the temperature rise of the liquid accompanying the change of ambient environmental temperature can be suppressed, temperature can be equalized, and sedimentation of the liquid can be suppressed. Therefore, it is possible to suppress the occurrence of ejection defects such as nozzle clogging.

  Here, the circulation control means preferably drives each of the second pressure generating means at different timings. In particular, it is preferable to drive each of the second pressure generating means sequentially from one end side to the other end side in the juxtaposed direction of the pressure generating chambers. Thereby, the liquid can be circulated more favorably between the first liquid chamber and the second liquid chamber.

  Further, when the second pressure generating means is configured to be able to drive in a direction in which the circulation flow path is enlarged and reduced, the circulation control means is arranged from the center in the juxtaposed direction of the pressure generating chambers. Also, the second pressure generating means on one end side and the second pressure generating means on the other end side are driven in opposite directions, respectively, or the adjacent second pressure generating means are respectively in reverse directions. It is preferable to drive. Thereby, the liquid can be circulated more favorably between the first liquid chamber and the second liquid chamber.

  Furthermore, the present invention provides a plurality of pressure generation chambers communicating with a nozzle for ejecting droplets, and a pressure change that is provided corresponding to each pressure generation chamber and causes a droplet to be ejected into the pressure generation chamber. 1 pressure generating means, a first liquid chamber provided on one end side of the pressure generating chamber and communicating with each pressure generating chamber, and a second liquid chamber provided on the other end side of the pressure generating chamber A circulation channel provided between the pressure generation chambers to connect the first liquid chamber and the second liquid chamber, and a pressure provided in the circulation channel corresponding to each circulation channel. And a second pressure generating means for causing a change, wherein the second pressure generating means is driven at a predetermined timing to cause a pressure change in the circulation flow path. The liquid in the first liquid chamber and the second liquid chamber via the circulation channel. The control method for a liquid jet head, characterized in that to the ring.

  In the present invention, the liquid can be circulated relatively easily between the first liquid chamber and the second liquid chamber at a predetermined timing. Thereby, the temperature rise of the liquid accompanying the change of ambient environmental temperature can be suppressed, temperature can be equalized, and sedimentation of the liquid can be suppressed. Therefore, it is possible to suppress the occurrence of ejection defects such as nozzle clogging.

1 is a schematic perspective view of a recording apparatus according to Embodiment 1. FIG. FIG. 3 is a cross-sectional view of the recording head according to the first embodiment. 3 is a plan view showing a flow path forming substrate according to Embodiment 1. FIG. 1 is a block diagram illustrating a configuration of a recording apparatus according to a first embodiment. FIG. 3 is a cross-sectional view illustrating a driving state of a second piezoelectric element according to the first embodiment. FIG. 3 is a diagram schematically illustrating the flow of ink in a circulation operation according to the first embodiment. 6 is a cross-sectional view showing a driving state of a second piezoelectric element according to Embodiment 2. FIG. FIG. 10 is a diagram schematically illustrating the flow of ink in a circulation operation according to the second embodiment. 6 is a cross-sectional view illustrating a driving state of a second piezoelectric element according to Embodiment 3. FIG. FIG. 10 is a diagram schematically illustrating the flow of ink in a circulation operation according to a third embodiment. FIG. 10 is a diagram schematically illustrating the flow of ink in a circulation operation according to a third embodiment. It is a top view which shows the structure of the circulation flow path which concerns on other embodiment.

Hereinafter, the present invention will be described in detail based on embodiments.
(Embodiment 1)
As shown in FIG. 1, an ink jet recording apparatus I which is an example of a liquid ejecting head according to Embodiment 1 includes ink jet recording heads (hereinafter simply referred to as “recording heads”). The cartridges 2A and 2B constituting the means are detachably provided, and the carriage 3 on which the recording head units 1A and 1B are mounted is provided on a carriage shaft 5 attached to the apparatus main body 4 so as to be axially movable. The recording head units 1A and 1B eject a black ink composition and a color ink composition, respectively.

  The driving force of the driving motor 6 is transmitted to the carriage 3 via a plurality of gears and timing belt 7 (not shown), so that the carriage 3 on which the recording head units 1A and 1B are mounted is moved along the carriage shaft 5. The On the other hand, the apparatus body 4 is provided with a platen 8 along the carriage 3. In addition, a paper discharge roller 9 is provided in the vicinity of the platen 8 and can be rotated by a driving force of a paper feed motor (not shown), and is a recording medium such as paper fed by a paper feed roller or the like. The recording sheet S is conveyed.

  In such an ink jet recording apparatus I, the carriage 3 is moved along the carriage shaft 5 and ink is ejected by the recording head units (recording heads) 1A and 1B to be printed on the recording sheet S.

  As shown in FIG. 2, the ink jet recording head 10, which is an example of the liquid ejecting head of the present embodiment, communicates with the flow path forming substrate 12 in which a plurality of pressure generating chambers 11 are arranged in parallel and the pressure generating chambers 11. A nozzle plate 14 having a plurality of nozzles 13 formed therein, a diaphragm 15 provided on the surface of the flow path forming substrate 12 opposite to the nozzle plate 14, and a piezoelectric element 16 provided on the diaphragm 15. Have.

  As shown in FIGS. 2 and 3, a plurality of pressure generating chambers 11 are partitioned by a partition wall 17 and arranged in parallel in the width direction of the flow path forming substrate 12. A reservoir 18 that is a first liquid chamber is provided through the flow path forming substrate 12 at one end in the longitudinal direction of the pressure generating chamber 11 of the flow path forming substrate 12. Each pressure generating chamber 11 and the reservoir 18 are connected to each other via an ink supply path 19. In this embodiment, the ink supply path 19 is formed with a width narrower than that of the pressure generation chamber 11, and plays a role of maintaining a constant flow path resistance of ink flowing from the reservoir 18 into the pressure generation chamber 11. .

  On the other hand, a circulating fluid chamber 20 as a second fluid chamber is provided on the other end side in the longitudinal direction of the pressure generating chamber 11 of the flow path forming substrate 12. The circulating fluid chamber 20 and the reservoir 18 are communicated with each other by a plurality of circulating channels 21 formed on the channel forming substrate 12. In the present embodiment, these circulation passages 21 are respectively provided on both outer sides of the row of pressure generation chambers 11 arranged in parallel and between the pressure generation chambers 11. Each circulation channel 21 is formed with a substantially constant width between the reservoir 18 and the circulating fluid chamber 20. For example, in the present embodiment, each circulation channel 21 is formed with a width substantially the same as that of the pressure generation chamber 11.

  Further, in this embodiment, the pressure generation chamber 11 is formed without penetrating the flow path forming substrate 12, and the flow path forming substrate 12 is provided on the end side opposite to the reservoir 18 of the pressure generation chamber 11. A nozzle communication path 22 that penetrates and communicates with the nozzle 13 is formed.

  A nozzle plate 14 is bonded to one surface side of the flow path forming substrate 12. As described above, each nozzle 13 communicates with each pressure generating chamber 11 via the nozzle communication path 22 provided in the flow path forming substrate 12. A diaphragm 15 is joined to the other surface side of the flow path forming substrate 12, that is, the opening surface side of the pressure generation chamber 11. Yes. A piezoelectric element 16 is fixed on the vibration plate 15 with its tip end in contact.

  The piezoelectric element 16 includes a first piezoelectric element 23 that is a first pressure generating unit and a second piezoelectric element 24 that is a second pressure generating unit. The first piezoelectric element 23 is provided corresponding to each pressure generating chamber 11 and generates a pressure change for ejecting ink droplets into each pressure generating chamber 11. The second piezoelectric element 24 is provided corresponding to each circulation channel 21 and causes a pressure change in the circulation channel 21.

  In the piezoelectric element 16 including the first piezoelectric element 23 and the second piezoelectric element 24, the piezoelectric layers 25, the individual internal electrodes 26, and the common internal electrodes 27 are alternately stacked, so that they do not contribute to piezoelectric deformation. The region is fixed to the fixed substrate 28. In addition, a drive wiring 30 on which a drive IC 29 is mounted is connected to the inactive region of the piezoelectric element 16.

  On the diaphragm 15, a head case 32 having an accommodating portion 31 that accommodates the piezoelectric element 16 in a state of being fixed to the fixed substrate 28 is fixed. The diaphragm 15 with which the tip of the piezoelectric element 16 abuts is a composite plate of, for example, an elastic film 33 made of an elastic member such as a resin film and a support plate 34 made of, for example, a metal material that supports the elastic film 33. The elastic film 33 side is bonded to the flow path forming substrate 12. Further, in the region of the vibration plate 15 facing the pressure generation chambers 11 and the circulation flow path 21, island portions 35 are provided to which the tip portions of the first and second piezoelectric elements 23 and 24 abut. That is, a thin portion 36 thinner than other regions is formed in a region facing each pressure generating chamber 11 and the peripheral portion of the circulation channel 21 of the diaphragm 15, and an island portion is formed inside each thin portion 36. 35 is provided.

  Note that, in the region facing the reservoir 18 of the vibration plate 15, similarly to the thin portion 36, a compliance portion 37 constituted by only the elastic film 33 is provided by removing the support plate 34. A space 38 that is a space that allows deformation of the compliance portion 37 is formed in a portion of the head case 32 that faces the compliance portion 37.

  In such an ink jet recording head, a printing operation is performed in which the volume of each pressure generation chamber 11 is changed by the deformation of the first piezoelectric element 23 and the vibration plate 15 and ink droplets are ejected from a predetermined nozzle 13. Specifically, when a voltage is applied to the first piezoelectric element 23 to contract the first piezoelectric element 23, the diaphragm 15 is deformed together with the first piezoelectric element 23 and the volume of the pressure generating chamber 11 is increased. Ink is drawn into the pressure generating chamber 11. Then, in a state where ink is filled up to the nozzle 13, the voltage applied to the first piezoelectric element 23 is released according to the recording signal from the drive IC 29. As a result, the first piezoelectric element 23 is expanded to return to the original state, and the diaphragm 15 is also displaced to return to the original state. As a result, the volume of the pressure generation chamber 11 contracts, the pressure in the pressure generation chamber 11 increases, and ink droplets are ejected from the nozzle 13.

  On the other hand, by applying a voltage to the second piezoelectric element 24 at a predetermined timing and causing the diaphragm 15 to bend and deform together with the second piezoelectric element 24, a pressure change is generated in the circulation flow path 21, and this circulation flow path is generated. A circulation operation for circulating the ink in the reservoir 18 serving as the first liquid chamber and the circulating liquid chamber 20 serving as the second liquid chamber is performed via the control unit 21. This circulation operation is executed at a predetermined timing, for example, before the start of printing.

  By performing such a circulation operation, even when the external environmental temperature changes, the temperature (viscosity) of the ink in the flow path such as the reservoir 18, the circulating liquid chamber 20, and the circulation flow path 21 is made uniform. be able to. In addition, since it is not necessary to perform a conventional flushing operation, the ink consumption can be suppressed, and the running cost can be reduced.

  Here, as shown in the block diagram of FIG. 4, the ink jet recording apparatus I controls the driving of the recording head 10, particularly the driving of the first piezoelectric element 23 and the second piezoelectric element 24 constituting the recording head 10. The drive control unit 50 is provided. In addition, the drive control unit 50 includes a circulation control unit 51 that drives the second piezoelectric element 24 at a predetermined timing to execute the above-described circulation operation. The circulation control means 51 controls the driving of each of the second piezoelectric elements 24 provided corresponding to the plurality of circulation channels 21 at a predetermined timing, for example, before the start of printing. A circulation operation for circulating the ink in the reservoir 18 and the circulating fluid chamber 20 through the circulation channel 21 is executed.

  Hereinafter, a method of driving the second piezoelectric element 24 during the circulation operation by the circulation control unit 51 will be described.

  For example, in the present embodiment, the second piezoelectric element 24 that is the second pressure generating means is provided on the vibration plate 15 that constitutes one surface of the circulation flow path 21 as described above, and the applied voltage. By adjusting the above, it is possible to drive in the direction of enlarging and reducing the volume of the circulation channel 21. That is, the volume of the circulation channel 21 is expanded by contracting the second piezoelectric element 24, and the volume of the circulation channel 21 is reduced by expanding the second piezoelectric element 24. In the present embodiment, when the circulation operation is started, the circulation control means 51 causes the second piezoelectric elements 24A and 24B corresponding to the adjacent circulation flow paths 21A and 21B, as shown in FIG. Drive each in the opposite direction. That is, as shown in FIG. 5A, the circulation control means 51 expands the second piezoelectric element 24A corresponding to one adjacent circulation channel 21A, and the second piezoelectric element 24A corresponding to the other circulation channel 21B. The second piezoelectric element 24B is contracted. By driving the second piezoelectric element 24 as described above, the ink flow toward the reservoir 18 and the circulating fluid chamber 20 is caused to flow in each circulation channel 21A as indicated by arrows in FIG. 6A. As a result, an ink flow in a direction in which ink flows from the reservoir 18 and the circulating fluid chamber 20 is generated in each circulation channel 21B.

  Conversely, as shown in FIG. 5B, when one of the second piezoelectric elements 24A is contracted, the other second piezoelectric element 24B is expanded. By driving the second piezoelectric element 24 as described above, the ink flows in the direction in which the ink flows from the reservoir 18 and the circulating fluid chamber 20 into each circulation channel 21A, as indicated by arrows in FIG. 6B. Thus, an ink flow toward the reservoir 18 and the circulating fluid chamber 20 occurs in each circulation channel 21B.

  By repeating such driving of the second piezoelectric elements 24A and 24B, the ink in the reservoir 18 and the circulating fluid chamber 20 is circulated (stirred) via the circulating flow path 21, and the reservoir 18, the circulating fluid chamber 20, The temperature of the ink in the ink flow path such as the circulation flow path 21 is made uniform, and ink settling is also suppressed. Accordingly, by subsequently driving the first piezoelectric element 23 and executing the printing operation, it is possible to eject ink droplets from each nozzle 13 satisfactorily. In other words, high-quality printing can always be realized by executing the above-described circulation operation.

  Furthermore, in the present invention, since the ink in the flow path is circulated by the piezoelectric element, the apparatus can be significantly downsized compared to the conventional structure in which the ink is circulated by a pump or the like.

(Embodiment 2)
This embodiment is another example of the driving method of the second piezoelectric element in the circulation operation. That is, the circulation control means 51 drives the second piezoelectric element on the one end side and the second piezoelectric element on the other end side in the opposite directions from the center of the pressure generating chambers in the juxtaposition direction during the circulation operation. This is an example.

  Specifically, as shown in FIG. 7A, the circulation control unit 51 includes the second piezoelectric element 24 </ b> C corresponding to the circulation channel 21 </ b> C on one end side from the central portion of the pressure generation chambers 11 in the parallel arrangement direction. While expanding, the 2nd piezoelectric element 24D corresponding to the circulation flow path 21D of the other end side rather than the center part of the parallel arrangement direction of the pressure generation chamber 11 is contracted. By driving the second piezoelectric elements 24C and 24D as described above, the flow of ink is indicated by arrows in FIG. 8A, and the ink flowing toward the reservoir 18 and the circulating fluid chamber 20 is placed in each circulation channel 21C. As a result, a flow of ink in a direction in which ink flows from the reservoir 18 and the circulating fluid chamber 20 is generated in each circulation channel 21D.

  Conversely, as shown in FIG. 7B, when the second piezoelectric element 24C on one end side is contracted, the second piezoelectric element 24B on the other side is expanded. By driving the second piezoelectric element 24 as described above, the ink flows in the direction in which the ink flows from the reservoir 18 and the circulating fluid chamber 20 into each circulation channel 21C as indicated by arrows in FIG. 8B. Thus, an ink flow toward the reservoir 18 and the circulating fluid chamber 20 is generated in each circulation channel 21D.

  By repeating such driving of the second piezoelectric elements 24C and 24D, the ink in the reservoir 18 and the circulating fluid chamber 20 is circulated (stirred) through the circulation channel 21 as in the case of the first embodiment. In addition, the temperature of the ink in the ink flow path such as the reservoir 18, the circulating fluid chamber 20, and the circulation flow path 21 is made uniform, and ink settling is also suppressed.

(Embodiment 3)
This embodiment is another example of the driving method of the second piezoelectric element in the circulation operation. That is, as shown in FIGS. 9 to 11, the circulation control means 51 drives each of the second piezoelectric elements 24 at different timings during the circulation operation. 9 to 12, the second piezoelectric element 24 being driven is hatched.

  Specifically, first, as shown in FIGS. 9A to 9D, the circulation control means 51 is arranged so that the pressure generating chambers 11 are arranged in the parallel direction from one end side (left side in the figure) to the other end side (right side in the figure). Each of the second piezoelectric elements 24 is driven sequentially. At this time, the circulation control means 51 expands each second piezoelectric element 24 in this embodiment. That is, the volume of the corresponding circulation channel 21 is contracted.

  By sequentially driving each of the second piezoelectric elements 24 in this manner, the flow of ink in the circulation flow path 21 corresponding to the driven second piezoelectric element 24 is indicated by arrows in FIGS. 10 and 11. Ink flows toward the reservoir 18 and the circulating fluid chamber 20, and this ink flow causes an ink flow in the direction in which ink flows from the reservoir 18 and the circulating fluid chamber 20 to the other circulating channel 21.

  By repeating the driving of the second piezoelectric element 24 as described above, the ink in the reservoir 18 and the circulating liquid chamber 20 is circulated (stirred) through the circulation channel 21 as in the case of the above-described embodiment. In addition, the temperature of the ink in the ink flow path such as the reservoir 18, the circulating liquid chamber 20, and the circulation flow path 21 is made uniform, and ink settling is also suppressed.

  In the present embodiment, the second piezoelectric element 24 is sequentially driven from one end side of the pressure generating chambers 11 in the side-by-side direction to execute the circulation operation. However, the second piezoelectric element 24 is driven at different timings. For example, the driving order itself is not particularly limited. Further, in the present embodiment, each second piezoelectric element 24 is expanded, but, of course, each second piezoelectric element 24 may be contracted.

(Other embodiments)
As mentioned above, although embodiment of this invention was described, this invention is not limited to these embodiment. For example, the circulation operation can be performed by simultaneously deforming the second piezoelectric element 24 in the same direction. However, in this case, for example, as shown in FIG. 12, in addition to the circulation channels 21 in which the second piezoelectric elements 24 are arranged, the circulation channels in which the second piezoelectric elements 24 are not arranged. It is preferable to further provide 21E. Thereby, similarly to the above-described embodiment, the ink in the flow path can be circulated (stirred) well. Of course, even when such a circulation channel 21E is not provided, the ink in the channel can be circulated well even if some of the second piezoelectric elements 24 are not driven.

  Further, in the above-described embodiment, as the pressure generating unit, the piezoelectric element in which the piezoelectric layer, the individual internal electrode, and the common internal electrode are alternately stacked is illustrated, but the configuration of the piezoelectric element is particularly limited. is not. Furthermore, the pressure generating means is not limited to a piezoelectric element, and for example, a so-called electrostatic type that generates static electricity between a diaphragm and an electrode, deforms the diaphragm by electrostatic force, and discharges a droplet from a nozzle. It may be an actuator or the like.

  In this embodiment, the ink jet recording apparatus in which the ink jet recording head is mounted on the carriage and moves in the main scanning direction is exemplified. However, the present invention is also applicable to other types of ink jet recording apparatuses. be able to. For example, the present invention is also applied to a so-called line type ink jet recording apparatus that has a plurality of fixed ink jet recording heads and performs printing only by moving a recording sheet S such as paper in the sub-scanning direction. Can do.

  Furthermore, in the present embodiment, the ink jet recording apparatus has been described as an example of the liquid ejecting apparatus. However, the present invention is widely applied to all liquid ejecting apparatuses having a liquid ejecting head, and liquids other than ink are used. Of course, the present invention can also be applied to a liquid ejecting apparatus including a liquid ejecting head for ejecting. 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 10 Recording head, 11 Pressure generating chamber, 12 Flow path formation board | substrate, 13 Nozzle, 14 Nozzle plate, 15 Vibrating plate, 18 Reservoir, 20 Circulating fluid chamber, 21 Circulating flow path, 23 1st piezoelectric element, 24 2nd Piezoelectric element, 29 drive IC, 30 drive wiring, 32 head case, 50 drive control unit, 51 circulation control means

Claims (6)

A plurality of pressure generating chambers communicating with a nozzle for ejecting droplets;
First pressure generating means that is provided corresponding to each pressure generating chamber and generates a pressure change for ejecting droplets into the pressure generating chamber;
A first liquid chamber provided on one end side of the pressure generating chamber and communicating with each pressure generating chamber;
A second liquid chamber provided on the other end side of the pressure generating chamber;
A circulation channel provided between each pressure generation chamber and connecting the first liquid chamber and the second liquid chamber;
A liquid ejecting head provided with a second pressure generating means provided corresponding to each circulation flow path and causing a pressure change in the circulation flow path;
The second pressure generating means is driven at a predetermined timing to cause a pressure change in the circulation flow path, and the liquid in the first liquid chamber and the second liquid chamber is passed through the circulation flow path. And a circulation control means for circulating the liquid ejecting apparatus.   The liquid ejecting apparatus according to claim 1, wherein the circulation control unit drives each of the second pressure generation units at different timings.   3. The liquid ejecting apparatus according to claim 2, wherein the circulation control unit sequentially drives each of the second pressure generation units from one end side to the other end side in the juxtaposition direction of the pressure generation chambers. . The second pressure generating means is configured to be capable of driving in a direction in which the circulation flow path is enlarged and reduced.
The circulation control means causes the second pressure generating means on one end side and the second pressure generating means on the other end side to drive in opposite directions from the center in the juxtaposed direction of the pressure generating chambers. The liquid ejecting apparatus according to claim 1. The second pressure generating means is configured to be capable of driving in a direction in which the circulation flow path is enlarged and reduced.
The liquid ejecting apparatus according to claim 1, wherein the circulation control unit causes the adjacent second pressure generation units to drive in opposite directions. A plurality of pressure generating chambers communicating with a nozzle for ejecting droplets;
First pressure generating means provided corresponding to each pressure generating chamber and causing a pressure change to eject droplets into the pressure generating chamber;
A first liquid chamber provided on one end side of the pressure generating chamber and communicating with each pressure generating chamber;
A second liquid chamber provided on the other end side of the pressure generating chamber;
A circulation channel provided between each pressure generation chamber and connecting the first liquid chamber and the second liquid chamber;
A control method of a liquid ejecting head, comprising: a second pressure generating means provided corresponding to each circulation flow path to cause a pressure change in the circulation flow path,
The second pressure generating means is driven at a predetermined timing to cause a pressure change in the circulation flow path, and the liquid in the first liquid chamber and the second liquid chamber is passed through the circulation flow path. A method of controlling a liquid ejecting head, characterized by being circulated.

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