JP2017109387A - Liquid jet head and liquid jet device - Google Patents

Abstract

Provided is a liquid ejecting head that can reduce bubbles in a liquid supply chamber during cleaning and liquid filling, and reduce a temperature difference in the liquid supply chamber during normal driving. A liquid ejecting apparatus includes an actuator substrate having a plurality of channels arranged in a reference direction, a liquid supply chamber communicating with the plurality of channels and elongated in the reference direction corresponding to the plurality of channels. 4 and a flow path member 3 having a liquid inflow hole 9 communicating with one end E1 of the liquid supply chamber 4 in the reference direction K. The liquid supply chamber 4 has a sectional area in a direction orthogonal to the reference direction K. There is provided switching means 6 for switching between a first mode in which the size decreases from one end E1 to the other end E2 in the reference direction K and a second mode in which the reduction width of the cross-sectional area is smaller than in the first mode. [Selection diagram] FIG.

Description

  The present invention relates to a liquid ejecting head and a liquid ejecting apparatus that record by ejecting droplets from a liquid ejecting head onto a recording medium.

  2. Description of the Related Art In recent years, there has been a liquid ejecting apparatus using an ink jet type liquid ejecting head that ejects ink droplets onto recording paper or the like to record characters and figures, or ejects a liquid material onto the surface of an element substrate to form a functional thin film. It's being used. In this method, a liquid such as ink or a liquid material is supplied from a liquid tank to a channel of a liquid ejecting head through a supply pipe, pressure is applied to the liquid in the channel, and the liquid is discharged as a droplet from a nozzle hole communicating with the channel. . When ejecting droplets, the liquid ejecting head and the recording medium are moved to record characters and figures, or a functional thin film or a three-dimensional structure having a predetermined shape is formed.

  FIG. 7 is an explanatory diagram of a conventionally known liquid jet head. FIG. 7A is a schematic cross-sectional view of the liquid ejecting head 100, and FIG. 7B represents a relationship between the temperature of the liquid ejected from the nozzle hole 107 of the liquid ejecting head 100 and the position of the nozzle hole 107. It is a graph. The liquid ejecting head 100 includes an actuator substrate 101, a flow path member 102 installed on one surface of the actuator substrate 101, and a nozzle plate 103 installed on the other surface of the actuator substrate 101. The actuator substrate 101 includes a plurality of channels 106 arranged in the reference direction K and a bubble removal channel 109. A partition wall 108 made of a piezoelectric material is formed between adjacent channels 106, and an electrode (not shown) is installed on the side surface of the partition wall. The flow path member 102 includes a liquid supply chamber 104 communicating with each channel 106 and a liquid inflow hole 105 through which the liquid flows into the liquid supply chamber 104. The liquid inflow hole 105 communicates with the liquid supply chamber 104 at one end in the reference direction K. The bubble removal channel 109 communicates with the liquid supply chamber 104 at the other end in the reference direction K. Furthermore, in the liquid supply chamber 104, the cross-sectional area Ds in the direction orthogonal to the reference direction K gradually decreases from one side to the other side in the reference direction K. The nozzle plate 103 includes a plurality of nozzle holes 107 communicating with the respective channels 106.

  The liquid jet head 100 is driven as follows. First, the liquid supply chamber 104 and each channel 106 are filled with liquid. The liquid is pressurized and supplied to the liquid inflow hole 105 and is filled into the channel 106 from the liquid supply chamber 104. In the liquid supply chamber 104, the cross-sectional area Ds in the direction orthogonal to the reference direction K gradually decreases from the liquid inflow hole 105 side to the bubble vent channel 109 side. The flow rate of the liquid to be pressurized and filled gradually increases from the liquid inflow hole 105 side to the bubble removal channel 109 side, and bubbles mixed in the liquid do not adhere to the inner wall of the liquid supply chamber 104 or the vicinity of the communication hole communicating with the channel 106. It is discharged from the bubble removal channel 109 and the channel 106.

  During normal driving, an electrode driving signal is applied to an electrode (not shown) formed on the side surface of the partition wall 108. The partition wall 108 undergoes thickness-slip deformation in a “<” shape, and a pressure wave is generated in the liquid filled in the channel 106. The pressure wave reaches the nozzle hole 107 and a droplet is ejected from the nozzle hole 107.

  For example, Patent Document 1 describes a method of removing bubbles adhering to the inner wall of a supply path of a liquid jet head by increasing the flow rate of the liquid. The liquid ejecting head includes a plurality of pressure chambers, a liquid supply chamber that communicates with the plurality of pressure chambers and supplies liquid to the plurality of pressure chambers, a supply path that connects the liquid tank and the liquid supply chamber, a liquid supply chamber, and a pressure chamber And a purge mechanism for sucking liquid from. Then, the supply path is formed of an elastic body, and when the liquid is sucked from the pressure chamber and the liquid supply chamber by the purge mechanism, the flow path cross section of the supply path is reduced to the same extent as the flow path cross section of the liquid supply chamber. As a result, it is described that the flow velocity of the liquid flowing through the supply path increases, and the residual bubbles mixed in the inner wall of the supply path and the liquid can be discharged.

  Patent Document 2 describes a liquid ejecting head in which a flow path cross-sectional control device is provided in a flow path between a pressure chamber and a tank. After the liquid is discharged from the nozzle, when the pressure chamber is refilled with liquid, the cross-sectional area of the liquid flow path between the tank and the pressure chamber is changed by the flow path cross-sectional control device. Thus, it is described that the meniscus return time is shortened, and the meniscus vibration after the return is further suppressed.

JP 2000-334948 A JP 2003-205608 A

  FIG. 7B shows the relationship between the temperature of the liquid ejected from the nozzle holes 107 of the liquid jet head 100 shown in FIG. 7A and the positions of the nozzle holes 107 arranged in the reference direction K. As shown in FIG. 7B, the nozzle hole 107 closer to the liquid inflow hole 105 has a lower liquid temperature, and the nozzle hole 107 farther from the liquid inflow hole 105 has a higher liquid temperature, resulting in a temperature difference δt. If there is a temperature difference in the liquid, a discharge speed difference occurs in the liquid droplets discharged from the nozzle hole 107, resulting in uneven density, resulting in a decrease in recording quality. The cause of this temperature difference is considered as follows. The partition wall 108 is heated by being repeatedly driven. Heat is transferred from the actuator substrate 101 to the liquid supply chamber 104 disposed opposite to the actuator substrate 101, and the temperature of the liquid rises. As the cross-sectional area Ds of the liquid supply chamber 104 decreases, the volume of the liquid decreases from the liquid inflow hole 105 to the bubble removal channel 109, and the temperature rises as the liquid is on the bubble removal channel 109 side.

  The liquid ejecting head described in Patent Document 1 has a structure in which a supply path that connects a liquid supply chamber and a liquid tank is formed of an elastic body, and the cross section of the flow path is adjusted. Further, the liquid ejecting head described in Patent Document 2 has a configuration in which a flow path cross-sectional control device is provided in each pressure chamber communicating with each nozzle. Therefore, none of the liquid ejecting heads can improve the temperature distribution of the liquid in the liquid supply chamber.

  The liquid ejecting head according to the present invention includes an actuator substrate having a plurality of channels arranged in a reference direction, a liquid supply chamber that communicates with the plurality of channels and that is elongated in the reference direction corresponding to the plurality of channels, and the liquid supply chamber A flow path member including a liquid inflow hole communicating with one end in the reference direction, and the liquid supply chamber has a cross-sectional area in a direction orthogonal to the reference direction that is reduced from one end to the other end in the reference direction. The movable wall which switches the 1st form to perform and the 2nd form with a smaller reduction | decrease width of the said cross-sectional area than said 1st form was provided.

  In addition, a switching unit that acts on the movable wall to switch between the first form and the second form is further provided.

  Further, the switching means drives the movable wall by electromagnetic force.

  In addition, the switching means drives the movable wall by changing the air pressure on the outer surface side opposite to the liquid supply chamber of the movable wall.

  The switching means drives the movable wall by bimetal.

  Further, the switching means drives the movable wall by changing the pressure of the liquid on the inner surface side which is the liquid supply chamber side of the movable wall.

  The channel has a first channel arranged in the reference direction on one surface of the actuator substrate and a second channel arranged in the reference direction on the other surface opposite to the one surface. The first flow path member includes a first liquid supply chamber communicating with the plurality of first channels and a first liquid inflow hole communicating with one end of the first liquid supply chamber in the reference direction. And a second flow path member comprising a second liquid supply chamber communicating with a plurality of the second channels and a second liquid inflow hole communicating with one end in the reference direction of the second liquid supply chamber, The movable wall includes a first movable wall provided in the first liquid supply chamber and a second movable wall provided in the second liquid supply chamber.

  Further, the actuator substrate has a bubble vent channel communicating with the other end of the liquid supply chamber opposite to the one end in the reference direction.

  The liquid ejecting apparatus according to the aspect of the invention includes the liquid ejecting head, a moving mechanism that relatively moves the liquid ejecting head and the recording medium, a liquid supply pipe that supplies liquid to the liquid ejecting head, and the liquid And a liquid tank for supplying the liquid to the supply pipe.

  A liquid ejecting head according to the present invention includes an actuator substrate having a plurality of channels arranged in a reference direction, a liquid supply chamber that communicates with the plurality of channels and that is elongated in the reference direction corresponding to the plurality of channels, and a reference direction of the liquid supply chamber A flow path member having a liquid inflow hole communicating with one end of the liquid supply chamber, and the liquid supply chamber has a first form and a first form in which a cross-sectional area in a direction orthogonal to the reference direction is reduced from one end to the other end in the reference direction A movable wall is provided that switches to a second form having a reduced cross-sectional area smaller than the form. As a result, the movable wall is set to the first form when the liquid ejecting head is cleaned or the liquid is filled, and the bubbles are discharged.When the liquid ejecting head is normally driven, the movable wall is switched to the second form to change the temperature difference in the liquid supply chamber. Can be reduced.

FIG. 3 is an explanatory diagram of a liquid ejecting head according to the first embodiment of the invention. FIG. 10 is an explanatory diagram of a liquid jet head according to a second embodiment of the present invention. FIG. 10 is an explanatory diagram of a liquid jet head according to a third embodiment of the present invention. FIG. 10 is an explanatory diagram of a liquid jet head according to a fourth embodiment of the present invention. FIG. 10 is an explanatory diagram of a liquid jet head according to a fifth embodiment of the invention. FIG. 10 is a schematic perspective view of a liquid ejecting apparatus according to a sixth embodiment of the present invention. It is explanatory drawing of a conventionally well-known liquid ejecting head.

(First embodiment)
FIG. 1 is an explanatory diagram of a liquid jet head 1 according to the first embodiment of the present invention. The first embodiment is a basic configuration of the present invention. The liquid ejecting head 1 includes an actuator substrate 2 and a flow path member 3. The actuator substrate 2 includes a plurality of channels 7 arranged in the reference direction K. The flow path member 3 communicates with the plurality of channels 7 and corresponds to the plurality of channels 7 and is elongated in the reference direction K, and the liquid inflow hole 9 communicates with one end E1 of the liquid supply chamber 4 in the reference direction K. With. The liquid supply chamber 4 includes a movable wall 5 where the first form A and the second form B are switched. In the first form A of the movable wall 5, the cross-sectional area Ds in the direction orthogonal to the reference direction K decreases from one end E1 to the other end E2 in the reference direction K. The second form B of the movable wall 5 has a smaller reduction width of the cross-sectional area Ds ′ that is reduced from the one end E1 to the other end E2 in the reference direction K than the first form A. As a result, the movable wall 5 is set to the first form A when the liquid jet head 1 is cleaned or filled with liquid, and bubbles are discharged, and the movable wall 5 is switched to the second form B during normal driving, so that the inside of the liquid supply chamber 4 The temperature difference is reduced to improve the recording quality.

  This will be specifically described below. The actuator substrate 2 includes a channel row 7r in which a plurality of channels 7 are arranged in the reference direction K. The flow path member 3 includes a liquid supply chamber 4 having an elongated shape in the reference direction K. The flow path member 3 is installed on one surface Sx of the actuator substrate 2 with the liquid supply chamber 4 corresponding to the plurality of channels 7. The liquid supply chamber 4 opens to the channel row 7r side and communicates with the plurality of channels 7 through the communication holes 10. The actuator substrate 2 includes a plurality of nozzle holes 11 on the other surface Sy different from the one surface Sx, and the plurality of nozzle holes 11 communicate with the plurality of channels 7, respectively. In FIG. 1, one surface Sx on which the flow path member 3 is installed and the other surface Sy on which the nozzle holes 11 are formed face each other. However, in the present invention, the one surface Sx on which the flow path member 3 is installed and the other surface Sy on which the nozzle holes 11 are formed do not have to face each other. For example, the flow path member 3 may be installed on the substrate surface (one surface Sx) of the actuator substrate 2 and the nozzle hole 11 may be formed on the side surface (other surface Sy) of the actuator substrate 2. In this case, the one surface Sx and the other surface Sy intersect. The communication hole 10 provided on the flow path member 3 side of the actuator substrate 2 may be composed of a plurality of communication ports that individually communicate with each of the plurality of channels 7.

  The liquid inflow hole 9 communicates with the liquid supply chamber 4 at one end E1 in the reference direction K. The movable wall 5 moves in the z direction, which is the normal direction of the one surface Sx of the actuator substrate 2, with the one end E1 side in the reference direction K of the liquid supply chamber 4 as a fulcrum. The first form A of the movable wall 5 is a form in which the other end E <b> 2 side of the movable wall 5 is positioned below (−z direction) approaching the actuator substrate 2, and the second form B of the movable wall 5 is other than the movable wall 5. In this configuration, the end E2 side is positioned above (+ z direction) away from the actuator substrate 2. Therefore, in the first form A, the cross-sectional area Ds in the direction perpendicular to the reference direction K of the liquid supply chamber 4 gradually decreases from one end E1 to the other end E2 in the reference direction K. The cross-sectional area Ds ′ in the direction perpendicular to the reference direction K of the liquid supply chamber 4 from the end E2 is substantially constant, and the reduced width of the cross-sectional area of the second form B is smaller than that of the first form A.

  If the movable wall 5 is set to the first form A when cleaning the liquid jet head 1 or filling the liquid, the cross-sectional area Ds of the liquid supply chamber 4 in the direction orthogonal to the reference direction K decreases from one end E1 to the other end E2. . If the liquid is pressed from the liquid inflow hole 9 or the liquid is sucked from the channel 7 side, the flow rate of the liquid in the liquid supply chamber 4 increases from one end E1 to the other end E2. Therefore, the bubbles mixed in the liquid are quickly discharged outside without adhering to the wall surface of the liquid supply chamber 4. If a bubble removal channel for discharging liquid is provided on the other end E2 side of the actuator substrate 2, the flow velocity on the other end E2 side can be further increased.

  On the other hand, if the movable wall 5 is set to the second form B when the liquid jet head 1 is normally driven, the reduction width of the cross-sectional area Ds ′ of the liquid supply chamber 4 that decreases from one end E1 to the other end E2 is the first form A. Is smaller than the reduction width of the cross-sectional area Ds. For this reason, the movable wall 5 of the second form B has a smaller decrease amount of the liquid amount from the one end E1 to the other end E2 than the movable wall 5 of the first form A. Since the actuator substrate 2 generates heat by driving, the liquid in the liquid supply chamber 4 is heated. However, in the second form B, the decrease in the amount of liquid from the one end E1 to the other end E2 is small. The temperature difference between the liquid on the E1 side and the other end E2 side is reduced, and the discharge conditions are made uniform.

(Second embodiment)
FIG. 2 is an explanatory diagram of the liquid jet head 1 according to the second embodiment of the present invention. The same part or the part having the same function is denoted by the same symbol.

  As shown in FIG. 2, the liquid ejecting head 1 includes an actuator substrate 2 and a flow path member 3 installed on one surface Sx of the actuator substrate 2. The actuator substrate 2 includes a channel row 7r composed of a plurality of channels 7 arranged in the reference direction K, and a bubble removal channel 8 installed in the vicinity of the end of the channel row 7r. The flow path member 3 includes a liquid supply chamber 4 that opens to the actuator substrate 2 side, and a liquid inflow hole 9 that allows the liquid to flow into the liquid supply chamber 4. The liquid supply chamber 4 communicates with the plurality of channels 7 and the bubble removal channel 8 via the communication holes 10 and has a shape elongated in the reference direction K corresponding to the channel row 7 r and the bubble removal channel 8. The liquid supply chamber 4 communicates with the liquid inflow hole 9 at one end E1 in the reference direction K, and communicates with the bubble removal channel 8 at the other end E2 in the reference direction K.

  The liquid supply chamber 4 has a reduced width of the cross-sectional area Ds ′ as compared with the first form A and the first form A in which the cross-sectional area Ds in the direction perpendicular to the reference direction K decreases from one end E1 to the other end E2 in the reference direction K. A movable wall 5 for switching to the small second form B is provided. The liquid jet head 1 further includes switching means 6 that switches between the first form A and the second form B by acting on the movable wall 5. The switching means 6 drives the movable wall 5 by electromagnetic force.

  This will be specifically described. The flow path member 3 communicates with the flow path case 3 x, the liquid supply chamber 4 covered with the flow path case 3 x, the liquid inflow hole 9 for flowing liquid into one end E 1 of the liquid supply chamber 4, and the liquid inflow hole 9. A liquid inflow portion 16. The flow path case 3x is elongated in the reference direction K and has a box shape that opens toward the one surface Sx of the actuator substrate 2. The liquid supply chamber 4 is a region surrounded by the inner wall surface of the flow path case 3 x and the movable wall 5, and opens toward the one surface Sx of the actuator substrate 2. The movable wall 5 of the liquid supply chamber 4 includes a flexible film 5x and a movable plate 5y. The flexible membrane 5x is watertightly fixed to the inner wall surface of the flow path case 3x so as to be able to accommodate a liquid. The movable plate 5y has an elongated shape in the reference direction K, one end E1 side is fixed to the flow path case 3x or the flexible film 5x, and the other end E2 side is bonded to the flexible film 5x so as to be movable in the z direction. . The flexible film 5x is fixed to the flow path case 3x by bending so that the other end E2 side of the movable plate 5y can move in the z direction. A space surrounded by the flexible membrane 5x and the flow path case 3x communicates with outside air. The movable plate 5y may be a plate body whose one end E1 side is pivotally supported by a rotating shaft installed in the flow path case 3x and whose other end E2 side is rotatable about the rotating shaft. The movable plate 5y has higher rigidity than the flexible film 5x. As the flexible film 5x, for example, a polyimide film, a polyethylene film, a polybutylene terephthalate film, a polyethylene terephthalate film, or the like can be used. Further, an elastic body having elasticity such as a rubber material can be used as the flexible film 5x. The flexible film 5x in the region to which the movable plate 5y is bonded is a flat surface and is inclined at a substantially constant angle with respect to the one surface Sx of the actuator substrate 2.

  The switching means 6 includes a permanent magnet 6y installed on the other end E2 side of the movable plate 5y, and an electromagnet 6x installed on the outer surface of the flow path case 3x so as to face the permanent magnet 6y. Instead of providing the permanent magnet 6y on the movable plate 5y, the movable plate 5y may be a permanent magnet. The movable wall 5 can be switched between the first form A and the second form B by an electromagnetic force by causing a current to flow from the control unit (not shown) to the electromagnet 6x.

  The actuator substrate 2 includes a plurality of channels 7 that are arranged in the reference direction K and constitute the channel row 7r, a bubble removal channel 8, and a plurality of nozzle holes 11 that communicate with the plurality of channels 7 and open to the other surface Sy. And a communication hole 10 communicating with the plurality of channels 7 and opening on one surface Sx. The flow path case 3x is installed on the surface of the actuator substrate 2, and the liquid supply chamber 4 communicates with the plurality of channels 7 and the bubble removal channel 8 through the communication holes 10. A filter (not shown) is installed in the communication hole 10, and the liquid supply chamber 4 communicates with the plurality of channels 7 and the bubble removal channel 8 through the filter. The communication hole 10 provided in the one surface Sx of the actuator substrate 2 may be a plurality of communication ports communicating with each of the plurality of channels 7 instead of the configuration communicating with the plurality of channels 7.

  The liquid jet head 1 is driven as follows. First, when the liquid is filled, the switching means 6 is driven to set the movable wall 5 to the first form A. Specifically, an electric current is passed through the electromagnet 6x to press the permanent magnet 6y downward (−z direction) to push down the movable plate 5y. Accordingly, the cross-sectional area Ds of the liquid supply chamber 4 in the direction orthogonal to the reference direction K decreases from one end E1 to the other end E2. Then, the liquid is press-fitted from the liquid inflow hole 9. The flow rate of the liquid in the liquid supply chamber 4 increases from one end E1 to the other end E2. Therefore, the bubbles mixed in the liquid are quickly discharged outside without adhering to the wall surface of the liquid supply chamber 4. Since the bubble removal channel 8 for discharging the liquid is provided on the other end E2 side of the actuator substrate 2, the flow velocity on the other end E2 side further increases.

  Next, during normal driving, the switching means 6 is driven to set the movable wall 5 to the second form B. Specifically, a current in the reverse direction is supplied to the electromagnet 6x to pull the movable plate 5y upward (in the + z direction). Therefore, the reduction width of the cross-sectional area Ds ′ of the liquid supply chamber 4 that decreases from one end E1 to the other end E2 is smaller than the reduction width of the cross-sectional area Ds in the first embodiment A. For this reason, the movable wall 5 of the second form B has a smaller decrease amount of the liquid amount from the one end E1 to the other end E2 than the movable wall 5 of the first form A. Since the actuator substrate 2 generates heat by driving, the liquid in the liquid supply chamber 4 is heated. However, in the second form B, the decrease in the amount of liquid from the one end E1 to the other end E2 is small. The temperature difference between the liquid on the E1 side and the other end E2 side is reduced, and the discharge conditions are made uniform. The temperature difference between the liquid on one end E1 side and the other end E2 side is preferably set to 5 ° C. or less, for example.

  In the present embodiment, the permanent magnet 6y and the electromagnet 6x may be interchanged, or both may be electromagnets. Further, the electromagnet 6x may be installed inside the flow path case 3x, and the permanent magnet 6y may be installed on the liquid supply chamber 4 side. Moreover, it can replace with the permanent magnet 6y and can use the ferromagnetic material which is not magnetized, for example, an iron material. Further, instead of installing the permanent magnet 6y, the movable plate 5y may be made of a ferromagnetic material. In these cases, an urging member is installed between the movable wall 5 and the flow path case 3x, or a space surrounded by the flexible film 5x and the flow path case 3x is defined as a sealed space. What is necessary is just to comprise so that the movable wall 5 may be decompress | restored to the 1st form A or the 2nd form B with the urging | biasing force of an urging member, or the air pressure of sealed space when the electric current sent through the electromagnet 6x is interrupted | blocked. Alternatively, a conductive plate may be installed in place of the electromagnet 6x and the permanent magnet 6y, and the movable wall 5 may be driven by electrostatic force. Moreover, instead of using the movable plate 5y, the movable wall 5 may have a higher rigidity in the flexible film 5x in the region of the movable plate 5y than in the flexible film in other regions. For example, the flexible film 5x in the region of the movable plate 5y is formed thicker than the other regions.

(Third embodiment)
FIG. 3 is an explanatory diagram of the liquid jet head 1 according to the third embodiment of the present invention. The difference from the second embodiment is that the movable wall 5 is driven by air pressure, and the configurations of the actuator substrate 2, the flow path case 3 x, the liquid inflow portion 16, and the liquid inflow hole 9 are the same as in the second embodiment. Is omitted. The same part or the part having the same function is denoted by the same symbol.

  As shown in FIG. 3, the movable wall 5 of the liquid supply chamber 4 includes a flexible film 5x and a movable plate 5y. The flexible membrane 5x is watertightly fixed to the inner wall surface of the flow path case 3x so as to be able to accommodate a liquid. The movable plate 5y has an elongated shape in the reference direction K, one end E1 side is fixed to the flow path case 3x or the flexible film 5x, and the other end E2 side is bonded to the flexible film 5x so as to be movable in the z direction. . The flexible film 5x is fixed to the flow path case 3x by bending so that the other end E2 side of the movable plate 5y can move in the z direction. The movable plate 5y may be configured such that one end E1 side is pivotally supported by a rotation shaft installed in the flow path case 3x and the other end E2 side is rotatable about the rotation shaft. The movable plate 5y has higher rigidity than the flexible film 5x. The material of the flexible film 5x is the same as in the second embodiment, and a description thereof is omitted.

  The switching means 6 includes a pressure chamber 6p formed between the movable plate 5y and the flow path case 3x, an air pump 6s that changes the air pressure in the pressure chamber 6p, and a communication path 6qa that communicates the pressure chamber 6p and the air pump 6s. With. The switching means 6 drives the movable wall 5 by changing the air pressure on the outer surface OS side opposite to the liquid supply chamber 4 of the movable wall 5.

  The liquid jet head 1 is driven as follows. First, at the time of liquid filling, the air pump 6s is driven to pressurize the pressure chamber 6p. The movable wall 5 is set to the first form A by the other end E2 side moving downward (−z direction) close to the actuator substrate 2 by the air pressure of the pressure chamber 6p. Accordingly, the cross-sectional area Ds of the liquid supply chamber 4 in the direction orthogonal to the reference direction K decreases from one end E1 to the other end E2. When the liquid is pressed from the liquid inflow hole 9, the flow rate of the liquid in the liquid supply chamber 4 increases from one end E1 to the other end E2. Therefore, the bubbles mixed in the liquid are quickly discharged outside without adhering to the wall surface of the liquid supply chamber 4. Since the bubble removal channel 8 for discharging the liquid is provided on the other end E2 side of the actuator substrate 2, the flow velocity on the other end E2 side further increases.

  During normal driving, the air pump 6s is driven to suck air from the pressure chamber 6p. The movable wall 5 is set to the second configuration B by moving the other end E <b> 2 upward (in the + z direction) away from the actuator substrate 2. Therefore, the reduction width of the cross-sectional area Ds ′ of the liquid supply chamber 4 that decreases from one end E1 to the other end E2 is smaller than the reduction width of the cross-sectional area Ds in the first embodiment A. For this reason, the movable wall 5 of the second form B has a smaller decrease amount of the liquid amount from the one end E1 to the other end E2 than the movable wall 5 of the first form A. Since the actuator substrate 2 generates heat by driving, the liquid in the liquid supply chamber 4 is heated. However, in the second form B, the decrease in the amount of liquid from the one end E1 to the other end E2 is small. The temperature difference between the liquid on the E1 side and the other end E2 side is reduced, and the discharge conditions are made uniform.

(Fourth embodiment)
FIG. 4 is an explanatory diagram of the liquid jet head 1 according to the fourth embodiment of the present invention. The difference from the third embodiment is that the movable wall 5 is driven by the liquid pressure in the liquid supply chamber 4. The actuator substrate 2, the flow path case 3 x, the liquid inflow portion 16, and the liquid inflow hole 9 are the second embodiment. Since it is the same as that, the description is omitted. The same part or the part having the same function is denoted by the same symbol.

  As shown in FIG. 4, the movable wall 5 of the liquid supply chamber 4 includes a flexible film 5x and a movable plate 5y. The flexible membrane 5x is watertightly fixed to the inner wall surface of the flow path case 3x so as to be able to accommodate a liquid. The movable plate 5y has an elongated shape in the reference direction K, one end E1 side is fixed to the flow path case 3x or the flexible film 5x, and the other end E2 side is bonded to the flexible film 5x so as to be movable in the z direction. . The flexible film 5x is fixed to the flow path case 3x by bending so that the other end E2 side of the movable plate 5y can move in the z direction. A space surrounded by the flexible membrane 5x and the flow path case 3x communicates with outside air. The movable plate 5y may be configured such that one end E1 side is pivotally supported by a rotation shaft installed in the flow path case 3x and the other end E2 side is rotatable about the rotation shaft. The movable plate 5y has higher rigidity than the flexible film 5x. The space between the movable plate 5y and the flow path case 3x communicates with the atmosphere via the opening 3y. The material of the flexible film 5x is the same as in the second embodiment, and a description thereof is omitted.

  The switching means 6 is attached to a suction cap 6u having a recess, a liquid pump 6t, a communication path 6qb communicating the suction cap 6u and the liquid pump 6t, and an upper side (+ z direction) separating the movable wall 5 from the actuator substrate 2. And a biasing member 6z for biasing. The switching unit 6 drives the movable wall 5 by changing the pressure of the liquid on the inner surface IS side that is the liquid supply chamber 4 side of the movable wall 5.

  The liquid jet head 1 is driven as follows. First, the movable wall 5 is set to the first form A at the time of liquid filling. Specifically, the suction cap 6u is moved relative to the other surface Sy of the actuator substrate 2 by a moving means (not shown), and the upper end surface of the recess is brought into close contact with the entire surface Sx so that the nozzle hole 11 is positioned in the opening of the recess. . Then, the liquid pump 6t is driven to reduce the inner space of the recess, the nozzle hole 11 and the bubble removal channel 8 to a negative pressure. The movable wall 5 is set to the first form A by being pressed downward (−z direction) where the other end E2 side approaches the actuator substrate 2 by atmospheric pressure. The liquid is sucked and flows into the liquid supply chamber 4 from the liquid inflow portion 16 and the liquid inflow hole 9 and is filled in each channel 7. Since the movable wall 5 maintains the first form A, the cross-sectional area Ds of the liquid supply chamber 4 in the direction orthogonal to the reference direction K decreases from one end E1 to the other end E2, and the liquid flows from one end E1 to the other end E2. Will increase. Therefore, the bubbles mixed in the liquid are quickly discharged outside without adhering to the wall surface of the liquid supply chamber 4. Since the bubble removal channel 8 for discharging the liquid is provided on the other end E2 side of the actuator substrate 2, the flow velocity on the other end E2 side further increases.

  During normal driving, the suction cap 6u is removed from the nozzle surface of the actuator substrate 2. The pressure of the liquid in the liquid supply chamber 4 approaches atmospheric pressure, and the movable wall 5 is urged upward (in the + z direction) by which the other end E2 side is separated from the actuator substrate 2 by the urging member 6z and set to the second form B. The As a result, the reduction width of the cross-sectional area Ds ′ of the liquid supply chamber 4 that decreases from one end E1 to the other end E2 is smaller than the reduction width of the cross-sectional area Ds in the first embodiment A. For this reason, the movable wall 5 of the second form B has a smaller decrease amount of the liquid amount from the one end E1 to the other end E2 than the movable wall 5 of the first form A. Since the actuator substrate 2 generates heat by driving, the liquid in the liquid supply chamber 4 is heated. However, in the second form B, the decrease in the amount of liquid from the one end E1 to the other end E2 is small. The temperature difference between the liquid on the E1 side and the other end E2 side is reduced, and the discharge conditions are made uniform.

  Instead of providing the urging member 6z on the movable wall 5, a spring material or the like is used as the movable plate 5y bonded to the movable wall 5, and the other end E2 side of the flexible film 5x is directed upward (+ z direction). It may be energized. In this case, the movable plate 5y functions as an urging member. Alternatively, the internal space surrounded by the movable wall 5 and the flow path case 3x by closing the opening 3y may be a sealed space. In this case, the pressure in the internal space is set in advance so as to be negative with respect to the liquid pressure in the liquid supply chamber 4 during normal driving.

  In addition, as the switching means 6, the bimetal which welded two types of metal plates from which a thermal expansion coefficient differs can be used separately from 1st-4th embodiment. For example, a heating element that generates heat when energized is provided in the bimetal, one end is fixed to the flow path case 3x, and the other end is locked to the movable plate 5y. By heating the heating element by energization, the bimetal is deformed, and the movable wall 5 can be switched from the first form A or the second form B to the second form B or the first form A.

(Fifth embodiment)
FIG. 5 is an explanatory diagram of the liquid jet head 1 according to the fifth embodiment of the invention. FIG. 5A is an exploded perspective view of the liquid ejecting head 1, FIG. 5B is a perspective view of the assembled state, and FIG. 5C is a view of the assembled state from the lower surface. It is a bottom view and FIG.5 (d) is a cross-sectional view of the part AA. The same portions or portions having the same function are denoted by the same reference numerals. In the present embodiment, unlike the first to fourth embodiments, the + y direction orthogonal to the Kz plane is upward and the -y direction is downward. The movable direction of the movable wall 5 is the z direction, which is the same as in the first to fourth embodiments.

  The liquid ejecting head 1 includes an actuator substrate 2 that ejects droplets, first and second flow path members 3a and 3b that sandwich the actuator substrate 2 from both sides, and ends of the first and second flow path members 3a and 3b. And first and second liquid inflow pipes 14a and 14b connected to the section. The actuator substrate 2 has a long and narrow shape in the reference direction K, and includes a first actuator substrate 2a on the one side Sa side and a second actuator substrate 2b on the opposite other side Sb side.

  The first actuator substrate 2a includes a plurality of first channels 7a arranged in the reference direction K of the one surface Sa, a first series of through holes 10a for introducing liquid into the plurality of first channels 7a, and the first actuator substrate 2a. Are provided with a plurality of first nozzle holes 11a that open to the lower end surface of the first channel 7a and communicate with each of the plurality of first channels 7a. Similarly to the first actuator substrate 2a, the second actuator substrate 2b includes a second channel 7b arranged in the reference direction K of the other surface Sb, and a second communication hole (not shown) for introducing liquid into the plurality of second channels 7b. 10b and a plurality of second nozzle holes 11b that open to the lower end surface of the second actuator substrate 2b and communicate with each of the plurality of second channels 7b. Therefore, as shown in FIG. 5C, the first nozzle hole 11 a and the second nozzle hole 11 b are arranged in parallel in the reference direction K on the lower end surface of the actuator substrate 2.

  The actuator substrate 2 specifically has a four-layer structure. The first actuator substrate 2a includes a piezoelectric plate having a large number of first channels 7a on the surface, a cover plate 18a that includes a first series of through holes 10a and is joined to the first channel 7a side of the piezoelectric plate, and a cover. A first filter 13a installed in the first series through hole 10a of the plate 18a and a first bubble removal filter 12a for removing bubbles are provided. Since the first channel 7a is exposed to the first through hole 10a, the liquid is supplied from the first through hole 10a to each first channel 7a. The second actuator substrate 2b has a similar structure. The first and second actuator substrates 2a and 2b constitute the actuator substrate 2 by joining the surfaces opposite to the surfaces on which the first and second channels 7a and 7b are formed back to back.

  The first flow path member 3a includes a first liquid supply chamber 4a that opens toward the actuator substrate 2, a first liquid inflow hole 9a for introducing liquid into the first liquid supply chamber 4a, and the first liquid inflow A first liquid inflow tube 14a communicating with the hole 9a is provided. As shown in FIG. 5 (d), the first liquid supply chamber 4a has an elongated shape in the reference direction K corresponding to the plurality of first channels 7a, and a plurality of first liquid supply chambers 4a via the first series of through holes 10a. It communicates with the channel 7a. The first liquid supply chamber 4a includes a first form A in which a cross-sectional area in a direction perpendicular to the reference direction K is reduced from one end E1a to the other end E2a in the reference direction K, and a second form having a smaller reduction width than the first form A. A first movable wall 5a that switches to B is provided. The first movable wall 5a includes a flexible film 5xa and a movable plate 5ya having higher rigidity than the flexible film 5xa. The flexible membrane 5xa is fixed to the first flow path member 3a so as to be able to store a liquid. The movable plate 5ya has an elongated shape in the reference direction K, one end E1a side is fixed to the first flow path member 3a, and the other end E2a side is bonded to the flexible film 5xa so as to be movable in the z direction perpendicular to the reference direction K. Is done. The flexible film 5xa is bent so that the movable plate 5ya can move, and is fixed to the first flow path member 3a in a watertight manner. The liquid jet head 1 further includes first switching means 6a that acts on the first movable wall 5a to switch between the first form A and the second form B. The first switching means 6a includes a permanent magnet 6ya installed on the other end E2a side of the first movable wall 5a, and an electromagnet 6xa installed on the first flow path member 3a so as to face the permanent magnet 6ya. The electromagnets 6xa and 6xb are fitted in the flow path cases of the first and second flow path members 3a and 3b, respectively.

  The second flow path member 3b has the same structure as the first flow path member 3a, and is for introducing a liquid into the second liquid supply chamber 4b that opens to the actuator substrate 2 side and the second liquid supply chamber 4b. Second liquid inflow hole 9b and a second liquid inflow pipe 14b communicating with the second liquid inflow hole 9b. The second liquid supply chamber 4b has an elongated shape in the reference direction K corresponding to the plurality of second channels 7b, and communicates with the plurality of second channels 7b through a second communication hole 10b (not shown). The second liquid supply chamber 4b has a first configuration A in which the cross-sectional area in the z direction orthogonal to the reference direction K is reduced from one end E1b to the other end E2b in the reference direction K, and a second reduction width smaller than the first configuration A. A second movable wall 5b that switches to form B is provided. The second movable wall 5b includes a flexible film 5xb and a movable plate 5yb having higher rigidity than the flexible film 5xb. The flexible membrane 5xb is watertightly fixed to the second flow path member 3b so as to be able to accommodate a liquid. The movable plate 5yb has an elongated shape in the reference direction K, one end E1b side is fixed to the second flow path member 3b, and the other end E2b side is movable on the flexible film 5xb so as to be movable in the z direction perpendicular to the reference direction K. Glued. The flexible film 5xb is fixed to the second flow path member 3b by bending so that the movable plate 5yb can move. The liquid jet head 1 further includes second switching means 6b that acts on the second movable wall 5b to switch between the first form A and the second form B. The second switching means 6b includes a permanent magnet 6yb installed on the second end E2b side of the second movable wall 5b, and an electromagnet 6xb opposed to the permanent magnet 6yb and installed in the second flow path member 3b.

  The connection member 15 includes a liquid introduction opening 17 provided in the upper portion, and first and second liquid inflow holes 9a and 9b provided in the lower side surface. The connecting member 15 has an internal flow path, and the upper opening 17 and the lower first and second liquid inflow holes 9a and 9b communicate with each other. The first liquid inflow pipe 14a of the first flow path member 3a is inserted into the first liquid inflow hole 9a on the lower side surface, and the second liquid inflow pipe 14b of the second flow path member 3b is inserted into the second liquid inflow hole 9b. The first and second flow path members 3a and 3b are fixed. The internal flow path of the connection member 15 has a shape that is plane-symmetric with respect to a vertical plane intermediate between the first liquid inflow hole 9a and the second liquid inflow hole 9b. Accordingly, the channel resistance and pressure of the liquid flowing into the first and second channel members 3a and 3b are equal.

  The liquid flowing in from the liquid inflow portion 16 is divided and flows into the first and second flow path members 3a and 3b via the first and second liquid inflow pipes 14a and 14b. Further, the liquid flows from the first and second flow path members 3a and 3b into the first and second channels 7a and 7b of the first and second actuator substrates 2a and 2b, and is based on a drive signal applied to the actuator substrate 2. Are discharged from the first and second nozzle holes 11a and 11b.

  The first and second movable walls 5a and 5b (hereinafter collectively referred to as the movable wall 5) are driven as follows. First, at the time of liquid filling, the first and second switching means 6a and 6b (hereinafter collectively referred to as switching means 6) are driven to set the movable wall 5 to the first form A. That is, by passing an electric current through the electromagnets 6xa and 6xb, the permanent magnets 6ya and 6yb are pressed in the direction of the first and second actuator substrates 2a and 2b (hereinafter collectively referred to as actuator substrate 2), and the movable wall 5 is moved to the actuator substrate 2 side. Press on. Accordingly, the cross-sectional area of the first and second liquid supply chambers 4a and 4b (hereinafter collectively referred to as the liquid supply chamber 4) in the direction perpendicular to the reference direction K is different from one end E1a and E1b (hereinafter collectively referred to as E1). The image is reduced toward the ends E2a and E2b (hereinafter collectively referred to as E2). Then, the liquid is supplied to the liquid inflow portion 16 to fill the liquid supply chamber 4 and the plurality of first and second channels 7a and 7b (hereinafter collectively referred to as channels 7). The flow rate of liquid increases from one end E1 side to the other end E2 side of the liquid supply chamber 4, and bubbles mixed in the liquid are quickly discharged outside without adhering to the wall surface of the liquid supply chamber 4. Since the bubble removal channel 8 for discharging the liquid is provided on the other end E2 side of the actuator substrate 2, the flow velocity on the other end E2 side further increases.

  Next, during normal driving, the switching means 6 is driven to set the movable wall 5 to the second form B. Specifically, a current in the reverse direction is supplied to the electromagnets 6xa and 6xb to attract the permanent magnets 6ya and 6yb in the direction opposite to the actuator substrate 2 to attract the movable wall 5. Accordingly, the cross-sectional area of the liquid supply chamber 4 in the z direction is smaller than the first embodiment A from one end E1 to the other end E2. For this reason, the movable wall 5 of the second form B has a smaller decrease amount of the liquid amount from the one end E1 to the other end E2 than the movable wall 5 of the first form A. Since the actuator substrate 2 generates heat by driving, the liquid in the liquid supply chamber 4 is heated. However, in the second form B, the decrease in the amount of liquid from the one end E1 to the other end E2 is small. The temperature difference between the liquid on the E1 side and the other end E2 side is reduced, and the discharge conditions are made uniform.

  In addition, since the liquid inflow part 16 was installed in the 1st and 2nd flow path members 3a and 3b and the edge part of the actuator board | substrate 2, the whole thickness of the liquid ejecting head 1 can be comprised thinly. Further, the liquid can be divided and supplied to the first and second flow path members 3a and 3b with equal flow path resistance and applied pressure. Further, a step for installing a filter is provided at the edge of the first through hole 10a on the surface of the first actuator substrate 2a, and the first filter 13a is installed. Similarly, a second filter 13b is provided on the surface of the second actuator substrate 2b. Furthermore, on the surfaces of the first and second actuator substrates 2a and 2b, the first and second flow path members 3a and 3b are connected to the ends opposite to the first and second liquid inflow holes 9a and 9b. First and second bubble removal filters 12a and 12b for removing bubbles mixed in the path are installed, and first and second bubble removal channels 8a and 8b for removing bubbles are formed at corresponding positions.

  By installing the first and second filters 13a and 13b, it is possible to reduce the occurrence of a problem in which the first and second nozzle holes 11a and 11b are clogged with bubbles. Further, when bubbles are mixed in the liquid, the bubbles can be quickly discharged to the outside through the first and second bubble removal channels 8a and 8b. In addition, since the liquid can be discharged through the first and second bubble vent channels 8a and 8b when the liquid is filled, the movable wall 5 is set to the first form A to further increase the flow rate of the liquid on the other end E2 side. The bubbles can be effectively discharged to the outside.

  In addition, since the first and second bubble removal filters 12a and 12b are installed above the first and second bubble removal channels 8a and 8b, the first and second liquids from the first and second bubble removal channels 8a and 8b. It is possible to prevent gas from entering the supply chambers 4a and 4b. Further, the end portions of the first and second flow path members 3a and 3b and the side surface of the connecting member 15 are provided with through portions 24 for fixing to a frame (not shown) with screws. Further, the switching means 6 of the third or fourth embodiment can be used as the switching means 6.

(Sixth embodiment)
FIG. 6 is a schematic perspective view of a liquid ejecting apparatus 50 according to the sixth embodiment of the present invention. The liquid ejecting apparatus 50 uses the liquid ejecting head 1 according to any one of the first to fifth embodiments. The liquid ejecting apparatus 50 includes a moving mechanism 63 that reciprocates the liquid ejecting heads 1 and 1 ′, liquid supply pipes 53 and 53 ′ that supply liquid to the liquid ejecting heads 1 and 1 ′, and liquid supply pipes 53 and 53 ′. Liquid tanks 51 and 51 'for supplying liquid to the liquid crystal.

  This will be specifically described. The liquid ejecting apparatus 50 includes a pair of conveying units 61 and 62 that convey a recording medium 54 such as paper in the main scanning direction, liquid ejecting heads 1 and 1 ′ that eject liquid to the recording medium 54, and a liquid tank 51. , 51 ′, pumps 52, 52 ′ for supplying the liquid stored in the liquid supply pipes 53, 53 ′ and a moving mechanism for scanning the liquid jet heads 1, 1 ′ in the sub-scanning direction perpendicular to the main scanning direction. 63 etc.

  The pair of conveying means 61 and 62 includes a grid roller and a pinch roller that extend in the sub-scanning direction and rotate while contacting the roller surface. A grid roller and a pinch roller are moved around an axis by a motor (not shown), and the recording medium 54 sandwiched between the rollers is conveyed in the main scanning direction. The moving mechanism 63 connects a pair of guide rails 56, 57 extending in the sub-scanning direction, a carriage unit 58 that can slide along the pair of guide rails 56, 57, and the carriage unit 58 to move in the sub-scanning direction. An endless belt 59 is provided, and a motor 60 that rotates the endless belt 59 via a pulley (not shown) is provided.

  The carriage unit 58 mounts a plurality of liquid ejecting heads 1, 1 ′, and ejects four types of liquid droplets, for example, yellow, magenta, cyan, and black. The liquid tanks 51 and 51 'store liquids of corresponding colors and supply them to the liquid jet heads 1 and 1' via the pumps 52 and 52 'and the liquid supply pipes 53 and 53'. Each liquid ejecting head 1, 1 ′ ejects droplets of each color according to the drive signal. An arbitrary pattern is recorded on the recording medium 54 by controlling the timing of ejecting the liquid from the liquid ejecting heads 1, 1 ′, the rotation of the motor 60 that drives the carriage unit 58, and the conveyance speed of the recording medium 54. I can.

  In this embodiment, the moving mechanism 63 moves the carriage unit 58 and the recording medium 54 to perform recording. However, instead of this, the carriage unit is fixed and the moving mechanism is the recording medium. May be a liquid ejecting apparatus that moves and records two-dimensionally. That is, the moving mechanism may be any mechanism that relatively moves the liquid ejecting head and the recording medium.

DESCRIPTION OF SYMBOLS 1 Liquid ejecting head 2 Actuator substrate, 2a 1st actuator substrate, 2b 2nd actuator substrate 3 Flow path member, 3a 1st flow path member, 3b 2nd flow path member, 3x flow path case, 3y opening 4 Liquid supply chamber, 4a 1st liquid supply chamber, 4b 2nd liquid supply chamber 5 movable wall, 5a 1st movable wall, 5b 2nd movable wall, 5x flexible film, 5y movable plate 6 switching means, 6a 1st switching means, 6b 2nd Switching means, 6s air pump, 6t liquid pump, 6u suction cap, 6p pressure chamber, 6qa, 6qb communication path, 6x electromagnet, 6y permanent magnet 7 channel, 7a first channel, 7b second channel, 7r channel row 8 Channel, 8a First air vent channel, 8b Second air vent channel 9 Liquid inlet hole, 9a First liquid inlet hole, 9b Second liquid inlet hole 10 Through-hole, 10a First through-hole, 10b Second communication hole 11 Nozzle hole, 11a First nozzle hole, 11b Second nozzle hole 12a First bubble removal filter, 12b Second bubble removal filter 13a First filter, 13b First Two filters 14a 1st liquid inflow pipe, 14b 2nd liquid inflow pipe 15 Connection member, 16 Liquid inflow part, 17 Opening part A 1st form, B 2nd form, Ds, Ds' Cross-sectional area K Reference direction, E1, E1a , E1b one end, E2, E2a, E2b other end, Sx one side, Sy other side, Sa one side, Sb other side, OS outer surface, IS inner surface

Claims (9)

An actuator substrate comprising a plurality of channels arranged in a reference direction;
A flow path member including a liquid supply chamber that communicates with the plurality of channels and that is elongated in the reference direction and that communicates with one end of the liquid supply chamber in the reference direction. ,
The liquid supply chamber has a first form in which a cross-sectional area in a direction orthogonal to the reference direction is reduced from one end to the other end in the reference direction, and a second form in which the reduction width of the cross-sectional area is smaller than the first form. A liquid ejecting head including a movable wall that switches between the two.   The liquid ejecting head according to claim 1, further comprising a switching unit that acts on the movable wall to switch between the first form and the second form.   The liquid ejecting head according to claim 2, wherein the switching unit drives the movable wall by an electromagnetic force.   The liquid ejecting head according to claim 2, wherein the switching unit drives the movable wall by changing an air pressure on an outer surface side of the movable wall opposite to the liquid supply chamber.   The liquid ejecting head according to claim 2, wherein the switching unit drives the movable wall by a bimetal.   The liquid ejecting head according to claim 2, wherein the switching unit drives the movable wall by changing a pressure of a liquid on an inner surface side that is the liquid supply chamber side of the movable wall. The channel has a first channel arranged in the reference direction on one surface of the actuator substrate, and a second channel arranged in the reference direction on the other surface opposite to the one surface,
The flow path member includes a first flow path member including a first liquid supply chamber communicating with a plurality of the first channels and a first liquid inflow hole communicating with one end of the first liquid supply chamber in the reference direction; A second flow path member comprising a second liquid supply chamber communicating with a plurality of the second channels and a second liquid inflow hole communicating with one end of the second liquid supply chamber in the reference direction;
The liquid ejecting head according to claim 1, wherein the movable wall includes a first movable wall provided in the first liquid supply chamber and a second movable wall provided in the second liquid supply chamber.   The liquid ejecting head according to claim 1, wherein the actuator substrate has a bubble vent channel that communicates with the other end of the liquid supply chamber opposite to the one end in the reference direction. A liquid ejecting head according to claim 1;
A moving mechanism for relatively moving the liquid ejecting head and the recording medium;
A liquid supply pipe for supplying a liquid to the liquid ejecting head;
And a liquid tank that supplies the liquid to the liquid supply pipe.

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