JP7602722B2 - LIQUID EJECTION HEAD AND LIQUID EJECTION APPARATUS - Google Patents

Description

The present invention relates to a liquid ejection head and a liquid ejection device.

Patent Document 1 discloses a droplet ejection head in which ejection liquid is pressurized and supplied to a cavity 23 that communicates with a nozzle 22, the nozzle 22 can be blocked by a pin 24, the pin 24 can be moved to and from the nozzle 22 by an actuator 25, and the actuator 25 is controlled by a control device 12, so that the pressurized ejection liquid is ejected as droplets from the nozzle 22 only while the pin 24 is separated from the nozzle 22.

The object of the present invention is to provide a liquid ejection head that reduces the load on the actuator and ensures a sufficient lifespan.

The present invention is a liquid ejection head comprising a liquid ejection port for ejecting liquid, a flow path connected to the liquid ejection port, a valve body for opening and closing the liquid ejection port, and an actuator for driving the valve body, and ejects liquid supplied to the flow path from the liquid ejection port while the valve body opens the liquid ejection port, characterized in that a plurality of actuators are provided for one of the valve bodies , and the plurality of actuators are sometimes not driven simultaneously .

The present invention provides a liquid ejection head that reduces the load on the actuator and ensures a sufficient lifespan.

1 is an overall perspective view showing an example of a liquid ejection head according to the present invention. FIG. 2 is an overall cross-sectional view of a liquid ejection head. FIG. 4 is an explanatory diagram of a single liquid ejection module. 4 is a control timing chart for an actuator. 1 is an overall perspective view showing an example of a liquid ejection device according to the present invention. FIG. Control block diagram.

An embodiment of the present invention is described below with reference to the drawings.

Figure 1 is an overall perspective view showing an example of a liquid ejection head according to the present invention.

The liquid ejection head 300 mainly comprises a housing 310, a connector 350, a supply port 311, and a recovery port 313. The housing 310 is made of a metal material or a resin material. The upper part of the housing 310 is provided with a connector 350 for communicating electrical signals.

In addition, on the left and right sides of the housing 310, there are a supply port 311 for supplying liquid into the head, and a recovery port 313 for discharging liquid from the head.

Figure 2 is an overall cross-sectional view of the liquid ejection head according to the present invention (cross-sectional view taken along line A-A in Figure 1).

The housing 310 has a connector 350 at the top for communicating electrical signals, and holds a nozzle plate 301 at the bottom, which has nozzles 302 for ejecting liquid. The housing 310 also has a flow path 312 that sends liquid from the supply port 311 side through the nozzle plate 301 to the recovery port 313 side.

Between the supply port 311 and the recovery port 313, a liquid ejection module 330 (details will be described later) is arranged to eject the ink in the flow path 312 from the nozzles 302. The number of liquid ejection modules 330 corresponds to the number of nozzles 302, and in this example, a configuration is shown that includes eight liquid ejection modules 330 corresponding to the eight nozzles 302 arranged in a row.

The number and arrangement of the nozzles 302 and liquid ejection modules 330 are not limited to the above. For example, the number of nozzles 302 and liquid ejection modules 330 may be one, rather than multiple. Furthermore, the nozzles 302 and liquid ejection modules 330 may be arranged in multiple rows, rather than in a single row.

With the above configuration, the supply port 311 takes in pressurized liquid from the outside, sends the liquid in the direction of the arrow a1, and supplies the liquid to the flow path 312. The flow path 312 sends the liquid from the supply port 311 in the direction of the arrow a2. Then, the recovery port 313 discharges the liquid that was not ejected from the nozzle 302 arranged along the flow path 312 in the direction of the arrow a3.

The liquid ejection module 330 includes a needle valve 331 that opens and closes the nozzle 302, and a piezoelectric element 332 that drives the needle valve 331. The housing 310 includes a regulating member 314 at a position opposite the upper end of the piezoelectric element 332. This regulating member 314 abuts against the upper end of the piezoelectric element 332, and serves as a fixed point for the piezoelectric element 332. Here, the needle valve 331 is an example of a valve body, and the piezoelectric element 332 is an example of an actuator.

In the above configuration, when the piezoelectric element 332 is operated and the needle valve 331 is displaced upward in the figure, the nozzle 302, which was closed by the needle valve 331, opens and liquid is ejected from the nozzle 302. Also, when the piezoelectric element 332 is operated and the needle valve 331 is displaced downward, the tip of the needle valve 331 comes into contact with the nozzle 302, closing the nozzle 302 and preventing liquid from being ejected from the nozzle 302.

Note that while liquid is being ejected from the nozzle 302, the discharge of liquid from the recovery port 313 may be temporarily suspended in order to avoid reducing the ejection efficiency from the nozzle 302.

Figure 3 is an explanatory diagram of a single liquid ejection module that constitutes a liquid ejection head.

The liquid ejection module 330 includes a needle valve 331 that opens and closes the nozzle 302, and a piezoelectric element 332 that drives the needle valve 331. The nozzle plate 301 is joined to the housing 310. The flow path 312 is a common flow path for multiple liquid ejection modules 330 provided in the housing 310.

The tip of the needle valve 331 is provided with an elastic member 331a, which ensures that the nozzle 302 is closed when the tip of the needle valve 331 is pressed against the nozzle plate 301. In addition, a bearing portion 321 is provided between the needle valve 331 and the housing 310, and a seal member 315 such as an O-ring is provided between the bearing portion 321 and the needle valve 331.

The piezoelectric element 332 is housed within the space 322 of the housing 310 via a holding member 333. The holding member 333 is made up of seven members 333a to 333g. Member 333a, located at the bottom of the holding member 333, holds the upper end of the needle valve 331. The space formed by members 333a, 333b, 333c, and 333d holds the first piezoelectric element 3321. The space formed by members 333d, 333e, 333f, and 333g holds the second piezoelectric element 3322.

Part of member 333g located at the top of holding member 333 abuts against restricting member 314, forming a fixed point that prevents holding member 333 from moving upward. In addition, the seven members 333a to 333g that make up holding member 333 are each connected via an elastic body 333h such as a leaf spring.

With the above configuration, the needle valve 331, the first piezoelectric element 3321, and the second piezoelectric element 3322 are arranged coaxially, i.e., in series in the liquid ejection direction, via the holding member 333. The holding member 333 is made of stainless steel or other material that is less susceptible to thermal expansion (such as Invar).

The first piezoelectric element 3321 and the second piezoelectric element 3322 are arranged so that their displacement directions are the same, and when a voltage is applied to the two piezoelectric elements by a voltage application means (not shown), the two piezoelectric elements drive the needle valve 331 in a direction that opens the nozzle 302. Therefore, when no voltage is applied to the piezoelectric element 332, the needle valve 331 closes the nozzle 302, so that no liquid is ejected from the nozzle 302 even if liquid is supplied under pressure to the flow path 312.

When a voltage is applied to the piezoelectric element 332, the piezoelectric element 332 contracts and pulls the needle valve 331 via the holding member 333, causing the needle valve 331 to move away from the nozzle 302 and open the nozzle 302. As a result, the liquid supplied under pressure to the flow path 312 is ejected from the nozzle 302.

In the above description, the two piezoelectric elements 3321, 3322 are arranged in series in the liquid ejection direction, but the arrangement of the piezoelectric elements is not limited to this. For example, the two piezoelectric elements 3321, 3322 may be arranged in parallel. Furthermore, the number of piezoelectric elements is not limited to two, and may be three or more.

As described above, this embodiment is a liquid ejection head 300 that includes a nozzle 302 that ejects liquid, a flow path 312 that communicates with the nozzle 302, a needle valve 331 that opens and closes the nozzle 302, and a piezoelectric element 332 that drives the needle valve 331, and ejects liquid supplied to the flow path 312 from the nozzle 302 while the needle valve 331 opens the nozzle 302, and multiple piezoelectric elements 3321, 3322 are provided for each needle valve 331.

As described above, the piezoelectric elements 3321 and 3322 have the same displacement direction.

Furthermore, as described above, multiple piezoelectric elements 3321, 3322 are arranged in series in the liquid ejection direction.

This makes it possible to provide a liquid ejection head that reduces the load on the piezoelectric element and ensures a sufficient lifespan.

Figure 4 is a timing chart of actuator control.

Figure 4 (a) shows a case where the first piezoelectric element 3321 and the second piezoelectric element 3322 are alternately driven. In this case, the first piezoelectric element 3321 and the second piezoelectric element 3322 are alternately driven in response to a drive waveform from the head drive control unit 902 (details of which are explained in Figure 7). For example, two piezoelectric elements are alternately driven, such as the first piezoelectric element 3321 in response to the drive pulse for the first drop, the second piezoelectric element 3322 in response to the drive pulse for the second drop, and the first piezoelectric element 3321 in response to the drive pulse for the third drop.

The cycle of alternating between the two piezoelectric elements is not limited to every liquid ejection. For example, the first piezoelectric element 3321 may be driven multiple times, and then the second piezoelectric element 3322 may be driven the same number of times, so that the two piezoelectric elements are repeatedly switched every predetermined number of drives.

As described above, by making it so that the first piezoelectric element 3321 and the second piezoelectric element 3322 are not driven at the same time, the drive frequency of the piezoelectric element alone can be halved, and the load on the piezoelectric element can be reduced.

Figure 4(b) is an embodiment different from Figure 4(a), and shows a case where the needle valve 331 is moved by sharing between the first piezoelectric element 3321 and the second piezoelectric element 3322. In other words, if the voltage applied to the piezoelectric element required to open and close the nozzle 302 is Vx, a voltage of Vx/2 is applied to each of the piezoelectric elements 3321 and 3322. Then, in response to the drive waveform from the head drive control unit 902, a voltage of Vx/2 is applied to the first piezoelectric element 3321 and the second piezoelectric element 3322 at the same cycle.

Figure 4(c), like Figure 4(b), shows a case where the needle valve 331 is moved by being shared between the first piezoelectric element 3321 and the second piezoelectric element 3322. Whereas Figure 4(b) is viewed from the perspective of applied voltage, Figure 4(c) is different in that it is viewed from the perspective of displacement. In other words, if the displacement amount of the needle valve 331 required to open and close the nozzle 302 is x, then each of the piezoelectric elements 3321 and 3322 generates a displacement amount of x/2. Then, in response to the drive waveform from the head drive control unit 902, the first piezoelectric element 3321 and the second piezoelectric element 3322 generate a displacement amount of x/2 in the same cycle.

Note that the applied voltage Vx and the displacement amount x are not limited to constant values. The applied voltage Vx and the displacement amount x may be variable depending on the input data.

As described above, in this embodiment, the multiple piezoelectric elements 3321 and 3322 are not always driven simultaneously.

As described above, the piezoelectric elements 3321 and 3322 are alternately driven. As described above, the piezoelectric elements 3321 and 3322 are driven by repeatedly switching between the piezoelectric elements 3321 and 3322 every predetermined number of drives.
Do.

Furthermore, if the applied voltage to the piezoelectric element required to open and close the nozzle 302 is Vx as described above, the multiple piezoelectric elements 3321 and 3322 are each driven with a voltage of Vx/2 (the denominator is the number of piezoelectric elements) and with the same period.

Furthermore, if the displacement of the needle valve 331 required to open and close the nozzle 302 is x as described above, then the multiple piezoelectric elements 3321 and 3322 are each driven with a displacement of x/2 (the denominator is the number of piezoelectric elements) and with the same period.

This halves the drive frequency of the piezoelectric element alone, reducing the load on the piezoelectric element.

As described above, the applied voltage Vx is variable depending on the input data. Furthermore, the displacement amount x is variable depending on the input data.

As a result, by setting the applied voltage Vx and the displacement amount x to large values, it becomes possible to eject large droplets, and by setting the applied voltage Vx and the displacement amount x to small values, it becomes possible to eject small droplets. As a result, it becomes possible to flexibly respond to the size of the droplets to be ejected.

Figure 5 is an overall perspective view of a printing device shown as an example of a liquid ejection device according to the present invention.

The printing device 1000 is installed facing the drawing object 100, which is an example of an object. The printing device 1000 has an X-axis rail 101, a Y-axis rail 102 that intersects with the X-axis rail 101, and a Z-axis rail 103 that intersects with the X-axis rail 101 and the Y-axis rail 102.

The Y-axis rail 102 holds the X-axis rail 101 so that the X-axis rail 101 can move in the Y direction (positive and negative). The X-axis rail 101 also holds the Z-axis rail 103 so that the Z-axis rail 103 can move in the X direction (positive and negative). The Z-axis rail 103 then holds the carriage 1 so that the carriage 1 can move in the Z direction (positive and negative). Here, the carriage 1 is an example of a liquid ejection unit.

The printing device 1000 includes a first Z-direction drive unit 92 that moves the carriage 1 in the Z direction along the Z-axis rail 103, and an X-direction drive unit 72 that moves the Z-axis rail 103 in the X direction along the X-axis rail 101. The printing device 1000 also includes a Y-direction drive unit 82 that moves the X-axis rail 101 in the Y direction along the Y-axis rail 102. The printing device 1000 also includes a second Z-direction drive unit 93 that moves the head holder 70 in the Z direction relative to the carriage 1. Here, the head holder 70 is an example of a holder.

The printing device 1000 configured as described above ejects ink, an example of a liquid, from a liquid ejection head provided on the head holder 70 while moving the carriage 1 in the X, Y, and Z directions, and performs drawing on the drawing target 100. Note that the movement of the carriage 1 and head holder 70 in the Z direction does not necessarily mean that it is parallel to the Z direction, and may be an oblique movement as long as it includes at least a component in the Z direction.

In FIG. 5, the surface shape of the drawing object 100 is flat, but the surface shape of the drawing object 100 may be a nearly vertical surface, a surface with a large radius of curvature, or a surface with some unevenness, such as the body of a car or truck or the body of an airplane.

Figure 6 is an overall perspective view of the carriage of the printing device shown in Figure 5, with the carriage 1 viewed from the side of the object 100 to be drawn.

The carriage 1 is equipped with a head holder 70. The carriage 1 can also move in the Z direction (positive and negative) along the Z-axis rail 103 by power from the first Z-direction drive unit 92 shown in FIG. 5.

The head holder 70 can move in the Z direction (positive and negative) relative to the carriage 1 by the power from the second Z direction drive unit 93 shown in FIG. 5. The head holder 70 also includes a head fixing plate 70a for mounting the liquid ejection head 300.

In this embodiment, six liquid ejection heads 300 as described in Figures 1 to 3 are attached to the head fixing plate 70a, and the six liquid ejection heads 300a to 300f are arranged in a stacked configuration.

Each of the liquid ejection heads 300a to 300f has a plurality of nozzles 302. The type and number of ink colors used by the heads 300a to 300f may be different for each head, or may all be the same color. For example, if the liquid ejection device exemplified as the printing device 1000 is a coating device that uses a single color, the inks used by the heads 300a to 300f may be the same color. Also, the number of heads constituting the head 300 is not limited to six. It may be more than six, or it may be less than six.

The liquid ejection heads 300 are fixed to the head fixing plate 70a with the nozzle rows of each head intersecting the horizontal plane (X-Z plane) and the arrangement direction of the multiple nozzles 302 tilted with respect to the X-axis, as shown in the figure. In this state, the nozzles 302 eject ink in a direction intersecting the direction of gravity (positive Z direction). Here, the nozzles 302 are an example of a liquid ejection port.

Figure 7 is a block diagram of the ink ejection control in a printing device shown as an example of a liquid ejection device according to the present invention.

The printing device 1000 includes a controller 901, a head drive control unit 902, etc. A computer 903 is also connected to the controller 901. The computer 903 includes a RIP (Routing Information Protocol) unit 9031, a rendering unit 9032, etc.

The RIP unit 9031 has a function of performing image processing according to a color profile and user settings. The rendering unit 9032 has a function of decomposing image data to be drawn on the drawing target 100 (see FIG. 5) into image data for each scan (for example, each unit of drawing that is drawn by one movement of the carriage 1 in the positive (or negative) X-axis direction). Here, image data is an example of input data.

An input device 9033 is also connected to the computer 903. The input device 9033 is made up of a keyboard, a mouse, a touch panel, etc., and accepts input from the user, such as image data to be drawn on the drawing subject 100, setting of coordinate data, selection of drawing mode, etc.

The controller 901 includes a system control unit 9011, an image data storage unit 9012, a memory control unit 9013, an ejection period signal generation unit 9014, and a carriage control unit 9015. The system control unit 9011 receives image data and commands from the computer 903 and controls the overall operation of the printing device 1000.

The image data storage unit 9012 includes memory such as a ROM (Read Only Memory), a RAM (Random Access Memory), and a HDD (Hard Disk Drive), and stores image data and the like received from the computer 903. The memory control unit 9013 writes image data and the like to the image data storage unit 9012 and reads image data and the like from the image data storage unit 9012 based on instructions from the system control unit 9011.

The ejection period signal generating unit 9014 generates an ink ejection period signal based on the output signal of the encoder sensor 109 and information indicating the resolution of the image data received from the computer 903.

Here, the encoder sensor 109 optically detects the slits of a linear encoder (not shown) installed along the X-axis rail 101 of the printing device 1000, for example, and generates the output signal described above. Note that the encoder sensor 109 is not limited to a linear encoder type, as long as it is configured to detect the X-direction position of the carriage 1. In addition to the linear encoder type, it may also be replaced with a type that counts the rotations of the drive motor of the X-direction drive unit 72, for example.

The carriage control unit 9015 calculates the position information of the carriage 1 based on the output signal of the encoder sensor 109, and controls the speed of the X-direction drive unit 72. In this example, the system control unit 9011 calculates the amount of change in the movement speed of the carriage 1. The system control unit 9011 then controls the speed of the carriage 1 based on this amount of change.

As described above, the controller 901 includes a system control unit 9011, an image data storage unit 9012, a memory control unit 9013, an ejection period signal generating unit 9014, and a carriage control unit 9015. The controller 901 has an arithmetic processing unit and a storage device, and the arithmetic processing unit executes a program pre-recorded in the storage device to realize each of these functional units.

Next, the head drive control unit 902 will be described. The head drive control unit 902, which controls the drive of the liquid ejection head 300, includes a drive waveform data storage unit 9021, a drive waveform generation unit 9022, a D/A converter 9023, a voltage amplifier unit 9024, and a current amplifier unit 9025. The drive waveform data storage unit 9021 stores the drive waveform for driving the liquid ejection head 300.

The drive waveform generating unit 9022 outputs the drive waveform data read from the drive waveform data storage unit 9021 to the D/A converter 9023 in response to an ejection period signal from the ejection period signal generating unit 9014. The D/A converter 9023 converts the drive waveform data received from the drive waveform generating unit 9022 into analog data, and outputs the analog data to the voltage amplifier 9024. The voltage amplifier 9024 amplifies the voltage of the analog data received from the D/A converter 9023. In addition, the current amplifier 9025 amplifies the current of the analog data received from the voltage amplifier 9024.

As described above, the head drive control unit 902 includes a drive waveform data storage unit 9021, a drive waveform generation unit 9022, a D/A converter 9023, a voltage amplifier unit 9024, and a current amplifier unit 9025. The drive waveform generated by the head drive control unit 902 realizes drive control for each nozzle of the liquid ejection head 300.

Note that the control configuration shown here is an example and is not limited to this. For example, the RIP unit 9031 and the rendering unit 9032 may be provided in the system control unit 9011 of the controller 901, rather than in the computer 903.

In the present invention, the liquid may be a solution, suspension, emulsion, etc., containing a solvent such as water or an organic solvent, a colorant such as a dye or pigment, a functionalizing material such as a polymerizable compound, a resin, or a surfactant, a biocompatible material such as DNA, amino acids, proteins, or calcium, or an edible material such as a natural dye.

These can be used, for example, in inkjet inks, coating materials, surface treatment liquids, components of electronic elements and light-emitting elements, liquids for forming electronic circuit resist patterns, and material liquids for three-dimensional modeling.

The liquid ejection device according to the present invention is not limited to the above-mentioned printing device. For example, it may be in a form in which the liquid ejection head of the present invention is attached to the tip of a robot arm of a multi-joint robot that has multiple joints that allow it to move freely like a human arm.

The above is just one example, and the present invention provides unique effects for each of the following aspects:

[First aspect]
The first aspect is a liquid ejection head (e.g., liquid ejection head 300) comprising a liquid ejection outlet (e.g., nozzle 302) for ejecting liquid, a flow path (e.g., flow path 312) communicating with the liquid ejection outlet, a valve body (e.g., needle valve 331) for opening and closing the liquid ejection outlet, and an actuator (e.g., piezoelectric element 332) for driving the valve body, and ejecting liquid supplied to the flow path from the liquid ejection outlet while the valve body opens the liquid ejection outlet, characterized in that a plurality of actuators (e.g., a first piezoelectric element 3321 and a second piezoelectric element 3322) are provided for one of the valve bodies.

[Second aspect]
The second aspect is the first aspect, characterized in that the plurality of actuators (for example, the first piezoelectric element 3321 and the second piezoelectric element 3322) have the same displacement direction.

[Third aspect]
The third aspect is characterized in that in the first or second aspect, the multiple actuators (e.g., the first piezoelectric element 3321 and the second piezoelectric element 3322) are arranged in series in the liquid ejection direction.

The first to third aspects make it possible to provide a liquid ejection head that reduces the load on the piezoelectric element and ensures a sufficient lifespan.

[Fourth aspect]
The fourth aspect is characterized in that in any one of the first to third aspects, the multiple actuators (e.g., the first piezoelectric element 3321 and the second piezoelectric element 3322) are not always driven simultaneously.

[Fifth aspect]
A fifth aspect is characterized in that in any one of the first to fourth aspects, the plurality of actuators (for example, the first piezoelectric element 3321 and the second piezoelectric element 3322) are alternately driven.

[Sixth aspect]
The sixth aspect is characterized in that, in any of the first to fifth aspects, the multiple actuators (e.g., the first piezoelectric element 3321 and the second piezoelectric element 3322) are driven by repeatedly switching the actuators every predetermined number of drives.

[Seventh aspect]
The seventh aspect is characterized in that, in any of the first to sixth aspects, when the applied voltage to the actuator (e.g., the piezoelectric element 332) required to open and close the liquid ejection port (e.g., the nozzle 302) is Vx, the multiple actuators (e.g., the first piezoelectric element 3321 and the second piezoelectric element 3322) are each driven with a voltage of Vx/Na (where Na is the number of actuators) and at the same cycle.

[Eighth aspect]
The eighth aspect is characterized in that, in any of the first to seventh aspects, when the displacement amount of the valve body (e.g., the needle valve 331) required to open and close the liquid ejection port (e.g., the nozzle 302) is x, the multiple actuators (e.g., the first piezoelectric element 3321 and the second piezoelectric element 3322) are each driven with a displacement amount of x/Na (where Na is the number of actuators) and at the same period.

According to the fourth to eighth aspects, the load on the actuator alone can be reduced.

[Ninth aspect]
A ninth aspect is the seventh aspect, characterized in that the applied voltage Vx is variable in response to input data (for example, image data).

[Tenth aspect]
A tenth aspect is the eighth aspect, characterized in that the displacement amount x is variable according to input data (for example, image data).

The ninth and tenth aspects allow for flexible response to the size of droplets to be ejected.

300 Liquid ejection head 301 Nozzle plate 302 Nozzle (liquid ejection port)
310 Housing 312 Flow path 330 Liquid ejection module 331 Needle valve (valve body)
332 Piezoelectric element (actuator)
3321 First piezoelectric element 3322 Second piezoelectric element 333 Holding member

JP 2010-241003 A

Claims (11)

a liquid ejection port for ejecting liquid;
a flow path communicating with the liquid ejection port;
a valve body that opens and closes the liquid discharge port;
an actuator that drives the valve body, and the liquid discharge head discharges liquid supplied to the flow path from the liquid discharge port while the valve body opens the liquid discharge port,
A plurality of actuators are provided for each of the valve bodies ;
The liquid ejection head according to claim 1, wherein the plurality of actuators are not driven simultaneously . a liquid ejection port for ejecting liquid;
a flow path communicating with the liquid ejection port;
a valve body that opens and closes the liquid discharge port;
an actuator for driving the valve body;
a valve body for opening the liquid ejection port and ejecting the liquid from the liquid ejection port, the valve body being configured to open the liquid ejection port and eject the liquid from the liquid ejection port while the valve body is opening the liquid ejection port,
A plurality of actuators are provided for each of the valve bodies;
A liquid ejection head , characterized in that the plurality of actuators are alternately driven . a liquid ejection port for ejecting liquid;
a flow path communicating with the liquid ejection port;
a valve body that opens and closes the liquid discharge port;
an actuator for driving the valve body;
a valve body for opening the liquid ejection port and ejecting the liquid from the liquid ejection port, the valve body being configured to open the liquid ejection port and eject the liquid from the liquid ejection port while the valve body is opening the liquid ejection port,
A plurality of actuators are provided for each of the valve bodies;
The liquid ejection head is characterized in that the plurality of actuators are driven by repeatedly switching the actuators every predetermined number of drives . a liquid ejection port for ejecting liquid;
a flow path communicating with the liquid ejection port;
a valve body that opens and closes the liquid discharge port;
an actuator for driving the valve body;
a valve body for opening the liquid ejection port and ejecting the liquid from the liquid ejection port, the valve body being configured to open the liquid ejection port and eject the liquid from the liquid ejection port while the valve body is opening the liquid ejection port,
A plurality of actuators are provided for each of the valve bodies;
A liquid ejection head characterized in that, when the applied voltage to the actuator required to open and close the liquid ejection port is Vx, the multiple actuators are each driven at a voltage of Vx/Na (where Na is the number of actuators) and with the same period . a liquid ejection port for ejecting liquid;
a flow path communicating with the liquid ejection port;
a valve body that opens and closes the liquid discharge port;
an actuator for driving the valve body;
a valve body for opening the liquid ejection port and ejecting the liquid from the liquid ejection port, the valve body being configured to open the liquid ejection port and eject the liquid from the liquid ejection port while the valve body is opening the liquid ejection port,
A plurality of actuators are provided for each of the valve bodies;
a liquid ejection head characterized in that, when the displacement amount of the valve body required to open and close the liquid ejection port is x, the plurality of actuators are each driven with a displacement amount of x/Na (where Na is the number of actuators) and at the same period . 6. The liquid ejection head according to claim 1, wherein the plurality of actuators have the same displacement direction . 7. The liquid ejection head according to claim 1, wherein the plurality of actuators are arranged in series in the ejection direction of the liquid . 5. The liquid ejection head according to claim 4, wherein the applied voltage Vx is variable in response to input data . 6. The liquid ejection head according to claim 5, wherein the displacement amount x is variable in response to input data . 10. The liquid ejection head according to claim 1, wherein the liquid is supplied to the flow path in a pressurized state . A liquid ejection apparatus comprising the liquid ejection head according to claim 1 .