JP2020044764A - Liquid discharge head and liquid discharge device - Google Patents

Abstract

To inhibit deterioration of print quality caused by a temperature difference of ICs.SOLUTION: A liquid discharge head includes: a pressure generating element which generates a pressure for discharging droplets; at least two wiring parts which transmit a driving signal to the pressure generating element; multiple integrated circuits (ICs) which are respectively provided at the wiring parts and perform driving control of the pressure generating element; and a heat sink which contacts with the multiple ICs and radiates heat of the ICs. The multiple ICs comprise: a first IC which contacts with the heat sink directly; and a second IC which contacts with the heat sink through the wiring part. The liquid discharge head includes a circuit which controls electric power consumption of the first IC so that electric power consumption of the first IC becomes larger than electric power consumption of the second IC.SELECTED DRAWING: Figure 6

Description

  The present invention relates to a liquid ejection head and an apparatus for ejecting liquid.

  2. Description of the Related Art Conventionally, there has been known a configuration in which a heat sink is provided in a plurality of FPCs (Flexible Printed Circuits) provided with ICs (Integrated Circuits). For example, Patent Document 1 discloses a configuration in which a heat sink is attached from the back side of an IC via an FPC for the purpose of cooling the IC.

  Depending on the layout of the FPC or the IC, the heat sink may be directly attached to the IC, or may be attached from the back side of the IC via the FPC. As described so far, merely providing a heat sink causes a difference in cooling efficiency of the heat sink depending on the IC, resulting in a temperature difference in the IC. The IC is configured by an analog switch or the like, and when the temperature changes, the on-resistance of the switch changes, and the driving waveform applied to the piezo varies depending on the IC, which causes a problem of ejection unevenness and a problem that print quality deteriorates. .

  SUMMARY OF THE INVENTION An object of the present invention is to provide a liquid ejection head capable of suppressing a decrease in print quality due to a temperature difference between ICs.

  The liquid discharge head according to the present invention is provided in each of a pressure generating element for generating a pressure for discharging a droplet, at least two wiring portions for transmitting a drive signal to the pressure generating element, and a plurality of the wiring portions. A plurality of ICs that perform drive control of the pressure generating element, and a heat sink that contacts the plurality of ICs and radiates heat of the ICs, wherein the plurality of ICs directly contact the heat sink; A circuit configured by a second IC that is in contact with the heat sink via the wiring unit, and that controls a power consumption of the first IC so as to be larger than a power consumption of the second IC. The liquid discharge head is characterized in that:

  According to the present invention, it is possible to suppress a decrease in print quality due to a temperature difference between ICs.

FIG. 2 is an external perspective view of an inkjet head which is an example of a liquid ejection head. FIG. 2 is an external perspective view of a heat sink included in the inkjet head. FIG. 2 is an external perspective view of a heat sink included in the inkjet head. FIG. 2 is an external perspective view of an IC unit mounted on the FPC. FIG. 3 is a schematic diagram of wiring to a piezoelectric element of an inkjet head. FIG. 6 is a diagram illustrating an equivalent circuit that realizes the wiring illustrated in FIG. 5. It is a figure showing an example of an applied waveform. It is a figure showing other examples of an applied waveform. It is a figure which shows an example of the apparatus which discharges a liquid, (A) is a perspective view which shows the outline of a principal part structure, (B) is a side view. It is a side view which shows an example of a liquid discharge unit. FIG. 3 is a top view illustrating an example of a liquid ejection unit. It is a side view which shows an example of a liquid discharge unit.

  Hereinafter, an embodiment of a liquid ejection head and an apparatus for ejecting liquid will be described in detail with reference to the accompanying drawings. In the liquid discharge head according to the present embodiment, since a heat waveform that does not affect the discharge is input to the IC on the side where the heat sink is bonded to the IC surface, the amount of heat generated by the IC directly attached to the heat sink increases. It is characterized by approaching the temperature of the attached IC from the back side through the.

  FIG. 1 is an external perspective view of an inkjet head 1000 which is an example of a liquid ejection head. FIG. 2 is an external perspective view of the heat sink 100 (first heat sink) included in the inkjet head 1000. FIG. 3 is an external perspective view of the heat sink 200 (second heat sink) included in the inkjet head 1000. FIG. 4 is an external perspective view of an IC unit mounted on the FPC.

  The ink jet head 1000 includes a heat sink for radiating heat generated by an IC driven in the ink jet head 1000 to the outside air. In the present embodiment, the heat sink is divided into the heat sink 100 shown in FIG. 2 and the heat sink 200 shown in FIG. 3, but these may be integrally formed. The heat sink 100 is a heat sink for contacting the outside air outside the inkjet head 1000 and dissipating heat generated from the IC 300 (first IC) and IC 300 ′ (second IC) to the outside via the heat sink 200. is there. The heat sink 200 functions to transmit heat generated from the ICs 300 and 300 ′ to the heat sink 100.

  As shown in FIG. 4, each of the IC 300 and the IC 300 'is mounted on the FPC 400 and the FPC 400' having the same shape and arranged so as to face each other. The ICs 300 and 300 'are ICs for controlling the driving of a pressure generating element for generating a pressure for discharging a droplet. FPC400 and FPC400 'are flexible wiring boards that transmit drive signals to the pressure generating elements.

  In this state, when the same heat sink is attached to the IC 300 and the IC 300 'from the near side of the drawing, the IC surface is directly attached to the heat sink for the IC 300. On the other hand, it is attached to the IC 300 'via the FPC 400'. Therefore, the heat radiation efficiency of the IC 300 ′ is lower than the heat radiation efficiency of the IC 300, and a difference occurs in the IC temperature between the IC 300 and the IC 300 ′. If there is a difference in the IC temperature, the characteristics of the switching elements in the IC, for example, the on-resistance of the analog switch will be different, and the discharge characteristics will be different, and the print quality will be deteriorated.

  FIG. 5 is a schematic diagram of wiring to a piezoelectric element of an inkjet head 1000 which is an example of a liquid ejection head. FIG. 6 is a diagram showing an equivalent circuit for realizing the wiring shown in FIG.

  PZT (lead zirconate titanate) 501 shown in FIG. 5 is a piezoelectric element. In the present embodiment, the voltage of the piezoelectric element is changed by changing the voltage between the terminals of the piezoelectric element, so that the liquid of the inkjet head 1000 is changed. A pressure change is generated in the chamber to discharge the droplet. As shown in FIG. 6, one electrode of the piezoelectric element is connected to a drive signal generation circuit 502 via an analog switch SW. The IC 300 and the IC 300 ′ control to turn on the SW corresponding to the nozzle that performs ejection, and the drive signal generation circuit 502 outputs a drive waveform, so that the drive waveform is supplied to the PZT 501 that is a piezoelectric element.

  FIG. 7 is a diagram illustrating an example of an applied waveform in the present embodiment. In this embodiment, in order to reduce the temperature difference between the IC 300 and the IC 300 ′, a drive waveform that does not eject ink is applied only to the IC 300 to which the heat sink is directly attached to the IC surface. FIG. 7 shows that a drive waveform to the extent that ink is not ejected is applied to the IC 300 (P1), while no drive waveform is applied to the IC 300 '(P2).

  In this way, the power consumption on the IC 300 side increases by the amount of the drive waveform, so that the amount of heat generation increases. Since the heat radiation efficiency of the IC 300 ′ is lower than that of the IC 300, the temperature is controlled to be approximately the same as that of the IC 300 ′ by increasing the amount of heat generated on the IC 300 side. Therefore, the temperature difference between the temperature of the IC 300 and the temperature of the IC 300 ′ can be reduced (for example, to a similar temperature), and deterioration of print quality can be prevented.

  FIG. 8 is a diagram illustrating an example of an applied waveform according to another embodiment. In this embodiment, in order to reduce the temperature difference between the IC 300 and the IC 300 ′, a drive waveform that does not discharge is applied only to the IC 300 to which a heat sink is directly attached on the IC surface in a non-printing section that is a timing outside the discharge. ing. In FIG. 8, in a non-printing section T ′ between printing sections T, a driving waveform that does not cause ink to be ejected is applied to the IC 300 (P3), while the driving waveform is applied to the IC 300 ′. It is shown that it has not been performed (P4).

  As described above, the IC 300 generates heat by the amount of the drive waveform. In the printing section T, the IC temperature at the start of printing increases by the amount of heat generated on the IC 300 side in the non-printing section T '. By such control, the temperature difference between the temperature of the IC 300 and the temperature of the IC 300 'during printing can be reduced (e.g., to the same temperature), and deterioration of print quality can be prevented.

  As described above, according to the liquid ejection head in each of the above-described embodiments, the pressure generating element for generating the pressure for discharging the liquid droplets and the at least two wiring portions (for example, FPC400 and FPC400 ′) for transmitting the drive signal to the pressure generating element. ), A plurality of ICs (e.g., IC300, IC300 ') provided in a plurality of wiring portions and for controlling the driving of the pressure generating element, and a heat sink (e.g., a heat sink) in contact with the plurality of ICs and radiating heat of the ICs 100, a heat sink 200), and the plurality of ICs are composed of a first IC (for example, IC 300) directly in contact with the heat sink and a second IC (for example, IC 300 ') in contact with the heat sink through a wiring portion. A circuit configured to control the power consumption of the first IC to be higher than the power consumption of the second IC (for example, Since comprises a dynamic signal generation circuit 502), it is possible to prevent deterioration of printing quality due to the difference in cooling efficiency of the heat sink. Specifically, by inputting a drive waveform of such a magnitude that does not affect ejection to the IC on the side where the heat sink is bonded to the IC surface, the amount of heat generated by the IC directly attached to the heat sink increases, so that the heat sink It is possible to approach the temperature of the IC attached from the back side through the FPC. Therefore, it is possible to reduce the difference in cooling efficiency between the IC to which the heat sink is directly attached and the IC to which the heat sink is attached from the back side via the FPC.

  In each of the above-described embodiments, the temperature difference between ICs is reduced by determining whether or not the drive signal generation circuit 502 outputs an applied drive waveform to such an extent that ink is not ejected. However, a drive waveform that causes a predetermined difference in power consumption may be output to each IC, instead of whether the drive signal generation circuit 502 outputs the applied drive waveform. That is, the drive signal generation circuit 502 causes a certain difference in power consumption of the driver IC between the FPC having the heat sink attached from the IC side and the FPC having the heat sink attached from the back side. Specifically, the drive signal generation circuit 502 outputs a drive signal (second drive signal) of such a magnitude that does not affect ejection to the IC 300 ′ to which the heat sink is attached from the back side, A drive signal (a first drive signal having a waveform larger by a predetermined difference than the second drive signal) having a magnitude that does not affect the ejection is output to the IC 300 attached from the IC side, and the heat sink is turned on. The one attached from the side is controlled so as to increase power consumption. For example, the drive signal generation circuit 502 outputs a high-frequency drive waveform that does not affect ejection to the IC 300, and outputs a low-frequency drive waveform that does not affect ejection to the IC 300 '. (A drive waveform of which the frequency is lower by a predetermined frequency than the high-frequency drive waveform) is output.

  Thereby, the temperature difference between the FPC with the heat sink attached from the IC side and the FPC with the heat sink attached from the back side can be reduced (for example, to the same temperature), and the deterioration of print quality can be prevented. can do.

  Note that the power consumption in each of the above embodiments can be considered as power consumption per discharge of one droplet in addition to power consumption per unit time. Furthermore, in addition to the power consumption per print data, per TEC (Typical Electricity Consumption) value, which is the power consumption for a conceptual week (5 days in which operation and sleep / off are repeated + 2 days in sleep / off) Power consumption.

[Liquid discharge unit]
The liquid discharge unit includes the above-described liquid discharge head (ink jet head 1000). FIGS. 10, 11 and 12 show an example of a liquid discharge unit mounted as an ink jet head.

  The “liquid ejection unit” is a unit in which other functional components and mechanisms are integrated with the liquid ejection head, and is an assembly of components related to the function of ejecting liquid. For example, the “liquid ejection unit” includes a combination of at least one of a head tank, a carriage, a supply mechanism, a maintenance and recovery mechanism, and a main scanning movement mechanism with a liquid ejection head.

  Here, the term “integration” means, for example, a case where the liquid ejection head and the functional component or mechanism are fixed to each other by fastening, bonding, engagement, or the like, or a case where one is movably held with respect to the other. Including. Further, the liquid ejection head, the functional component, and the mechanism may be configured to be detachable from each other.

  For example, as the liquid discharge unit 440, there is a liquid discharge unit 440 in which a liquid discharge head 404 and a head tank 441 are integrated as shown in FIG.

  The liquid discharge unit 440 shown in FIG. 10 is mounted on the carriage 403. The carriage 403 is held by a guide member 401 constituting a main scanning movement mechanism, and reciprocates in the main scanning direction.

  FIG. 10 shows a transport belt 412 as a means for transporting a recording medium (for example, paper) among members constituting a device for ejecting a liquid described later. The transport belt 412 is an endless belt, and is stretched between a transport roller 413 and a tension roller 414.

  In some cases, the liquid ejection head and the head tank are integrated with each other by a tube or the like. Here, a unit including a filter can be added between the head tank and the liquid discharge head of these liquid discharge units.

  There is a liquid discharge unit in which a liquid discharge head and a carriage are integrated.

  Further, as the liquid discharge unit, the liquid discharge head 404 and the main scanning moving mechanism 493 are integrated so that the liquid discharging head 404 is movably held by the guide member 401 constituting a part of the main scanning moving mechanism. There is. In addition, as shown in FIG. 11, there is a liquid ejection head 404, a carriage 403, and a main scanning movement mechanism 493 which are integrated.

  The liquid discharge unit 440 illustrated in FIG. 11 includes a housing portion including side plates 491A and 491B and a back plate 491C, a main scanning moving mechanism 493, It comprises a carriage 403 and a liquid ejection head 404. The arrow D1 in the figure indicates the main scanning direction.

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

  As a liquid discharge unit, there is a liquid discharge unit in which a tube 456 is connected to a liquid discharge head 404 to which a flow path component 444 is attached as shown in FIG. 12, and the liquid discharge head 404 and a supply mechanism are integrated. The liquid from the liquid storage source is supplied to the liquid ejection head 404 via the tube 456.

  The channel component 444 is disposed inside the cover 442. A head tank 441 may be included instead of the flow path component 444. Further, a connector 443 for making an electrical connection with the liquid ejection head 404 is provided above the flow path component 444.

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

[Device for discharging liquid]
An apparatus for discharging liquid includes the above-described liquid discharge head. It is possible to achieve both excellent assemblability and excellent heat dissipation efficiency, and it is possible to save space by providing a liquid discharge head that can increase the maximum discharge amount, and it is possible to reduce the size of the device that discharges liquid. In addition to achieving cost reduction, it is possible to prevent malfunction due to temperature rise and the like, and to realize stable liquid ejection.

  In the present application, the “device for discharging liquid” is a device that includes a liquid discharge head or a liquid discharge unit and drives the liquid discharge head to discharge liquid. The device that discharges a liquid includes not only a device that can discharge a liquid to which a liquid can be attached, but also a device that discharges a liquid into the air or into the liquid.

The “device for discharging liquid” may include a unit for feeding, transporting, and discharging paper to which liquid can be attached, as well as a pre-processing device and a post-processing device.

For example, as a "device for ejecting liquid", an image forming apparatus that ejects ink to form an image on paper, and a powder is formed in layers to form a three-dimensional object (three-dimensional object) There is a three-dimensional modeling device (three-dimensional modeling device) that discharges a modeling liquid to the formed powder layer.

  Further, the “device for discharging liquid” is not limited to a device in which a significant image such as a character or a graphic is visualized by the discharged liquid. For example, those that form a pattern or the like that has no meaning in itself, and those that form a three-dimensional image are also included.

  The above-mentioned "thing to which a liquid can be attached" means a thing to which a liquid can be attached at least temporarily, such as a thing which adheres and adheres, a thing which adheres and penetrates, and the like. Specific examples include recording media such as paper, recording paper, recording paper, film, and cloth; electronic components such as electronic substrates and piezoelectric elements; powder layers (powder layers); organ models; and media such as inspection cells. Yes, unless otherwise specified, includes everything to which a liquid adheres.

  The material of the above-mentioned "thing to which the liquid can be attached" may be paper, thread, fiber, cloth, leather, metal, plastic, glass, wood, ceramics, etc. as long as the liquid can be attached even temporarily.

  The “liquid” is not particularly limited as long as it has a viscosity and a surface tension that can be ejected from the head, but is not particularly limited at normal temperature and normal pressure, or a material whose viscosity becomes 30 mPa · s or less by heating and cooling. Preferably, there is. More specifically, solvents such as water and organic solvents, coloring agents such as dyes and pigments, polymerizable compounds, resins, functional imparting materials such as surfactants, and biocompatible materials such as DNA, amino acids, proteins, and calcium. , Edible materials such as natural pigments, and the like, solutions, suspensions, emulsions, and the like. These include, for example, ink-jet inks, surface treatment liquids, components of electronic elements and light-emitting elements, and formation of resist patterns for electronic circuits. Liquid, three-dimensional modeling material liquid, and the like.

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

  Other examples of the “liquid discharging device” include a processing liquid coating device that discharges a processing liquid onto a paper in order to apply the processing liquid to the surface of the paper for the purpose of modifying the surface of the paper, and a raw material. There is an injection granulation apparatus that granulates the fine particles of the raw material by spraying a liquid composition dispersed in a solution through a nozzle.

  FIG. 9 shows an example of an ink jet image forming apparatus which is an apparatus for discharging a liquid in which a liquid discharge head is mounted as an ink jet head. FIG. 9A is a perspective view schematically showing a configuration of a main part, and FIG. 9B is a side view.

  The inkjet image forming apparatus 301 includes a liquid ejection apparatus including a carriage movable in the main scanning direction, a recording head including an inkjet head mounted on the carriage, an ink cartridge for supplying ink to the recording head, and the like inside an apparatus main body. The unit is housed in the printing mechanism 302. A paper feed cassette (paper feed tray) 304 capable of stacking a large number of recording papers 303 can be attached to the lower part of the apparatus body from the front side so as to be freely inserted and removed, and the recording papers 303 are manually fed. The manual feed tray 305 can be opened, the recording paper 303 fed from the paper feed cassette 304 or the manual feed tray 305 is taken in, a required image is recorded by the printing mechanism 302, and the paper is mounted on the rear side. The paper is discharged to the discharged paper discharge tray 306.

  The printing mechanism 302 holds the carriage 313 slidably in the main scanning direction (perpendicular to the plane of the paper) by a main guide rod 311 and a sub guide rod 312, which are guide members that are horizontally mounted on left and right side plates (not shown), The carriage 313 has a recording head 314 composed of ink jet heads that discharge ink droplets of yellow (Y), cyan (C), magenta (M), and black (B). They are arranged in a crossing direction, and are mounted with the ink droplet ejection direction facing downward. The carriage 313 is provided with ink cartridges 315 for supplying ink of each color to the recording head 314 in a replaceable manner.

  The ink cartridge 315 has an upper air port communicating with the atmosphere, a lower supply port for supplying ink to the inkjet head, and a porous body filled with ink inside, and a capillary force of the porous body. Maintains the ink supplied to the inkjet head at a slight negative pressure.

  Although the recording heads 314 of each color are used here as recording heads, a single head having nozzles for ejecting ink droplets of each color may be used. Further, the ink jet head used as the recording head 314 is a piezo type in which the ink is pressurized through a vibration plate forming a liquid chamber wall by an electromechanical transducer such as a piezoelectric element, or bubbles are generated by a heating resistor to generate the ink. It is possible to use a bubble type that pressurizes, or an electrostatic type that presses ink by displacing the diaphragm with electrostatic force between a diaphragm forming an ink flow path wall surface and an electrode facing the diaphragm, In the present embodiment, an electrostatic inkjet head is used.

  Here, the carriage 313 is slidably fitted to the main guide rod 311 on the rear side (downstream side in the paper conveyance direction), and is slidably mounted on the front side (downstream side in the paper conveyance direction) on the sub guide rod 312. doing. In order to move and scan the carriage 313 in the main scanning direction, a timing belt 320 is stretched between a driving pulley 318 driven by a main scanning motor 317 and a driven pulley 319, and the timing belt 320 is attached to the carriage 313. , And the carriage 313 is reciprocally driven by forward and reverse rotation of the main scanning motor 317.

  On the other hand, in order to transport the recording paper 303 set in the paper supply cassette 304 to the lower side of the recording head 314, a paper supply roller 321 and a friction pad 322 for separating and supplying the recording paper 303 from the paper supply cassette 304, and a recording paper A guide member 323 for guiding the recording paper 303, a transport roller 324 that reverses and transports the fed recording paper 303, and a transport roller 325 pressed against the peripheral surface of the transport roller 324 and the recording paper 303 from the transport roller 324. A tip roller 326 for defining the sending angle is provided. The transport roller 324 is driven to rotate by a sub-scanning motor 327 via a gear train.

  In addition, a print receiving member 329 is provided as a paper guide member for guiding the recording paper 303 sent out from the transport roller 324 below the recording head 314 in accordance with the movement range of the carriage 313 in the main scanning direction. On the downstream side of the printing receiving member 329 in the paper transport direction, there are provided a transport roller 331 and a spur 332 that are driven to rotate to transport the recording paper 303 in the paper discharging direction, and further transmit the recording paper 303 to the paper discharge tray 306. Discharge rollers 333 and spurs 334 and guide members 335 and 336 forming a discharge path are provided.

  At the time of recording, by driving the recording head 314 in accordance with the image signal while moving the carriage 313, ink is discharged onto the stopped recording paper 303 to record one line, and the recording paper 303 is conveyed by a predetermined amount. Then record the next line. Upon receiving a recording end signal or a signal indicating that the rear end of the recording paper 303 has reached the recording area, the recording operation is terminated and the recording paper 303 is discharged.

  Further, a recovery device 337 for recovering a discharge failure of the print head 314 is disposed at a position outside the print area on the right end side in the moving direction of the carriage 313. The recovery device has cap means, suction means and cleaning means. The carriage 313 is moved to the recovery device 337 side during printing standby, the recording head 314 is capped by the capping means, and the ejection opening is kept wet, thereby preventing ejection failure due to ink drying. In addition, by discharging ink that is not related to printing during printing or the like, the ink viscosity of all the outlets is kept constant, and stable discharging performance is maintained.

  When a discharge failure occurs, the discharge port of the recording head 314 is sealed with a capping means, bubbles are sucked out of the discharge port with ink by a suction means through a tube, and ink and dust adhered to the discharge port surface are cleaned. The ejection failure is recovered by the means. The sucked ink is discharged to a waste ink reservoir (not shown) provided at a lower portion of the main body, and is absorbed and held by an ink absorber inside the waste ink reservoir.

1000 Inkjet head 100, 200 Heat sink 300, 300 'IC
400, 400 'FPC
401 guide member 403 carriage 404 liquid discharge head 405 main scanning motor 406 drive pulley 407 driven pulley 408 timing belt 412 transport belt 413 transport roller 414 tension roller 440 liquid discharge unit 441 head tank 442 cover 443 connector 444 flow path component 456 tube 491A, 491B Side plate 491C Back plate 493 Main scanning movement mechanism 501 PZT
502 Drive signal generation circuit SW switch

JP 2013-063555 A

Claims (7)

A pressure generating element for generating a pressure for discharging a droplet,
At least two wiring portions for transmitting a drive signal to the pressure generating element;
A plurality of ICs provided in each of the plurality of wiring portions and for controlling the driving of the pressure generating element;
A heat sink that contacts the plurality of ICs and radiates heat of the ICs;
The plurality of ICs includes a first IC directly in contact with the heat sink, and a second IC in contact with the heat sink through the wiring portion,
A circuit for controlling the power consumption of the first IC so as to be larger than the power consumption of the second IC;
A liquid ejection head characterized by the above-mentioned. The liquid ejection head according to claim 1,
The circuit applies a drive signal to the first IC so as not to be ejected during ejection, and does not apply the drive signal to the second IC.
A liquid ejection head characterized by the above-mentioned. The liquid ejection head according to claim 1,
The circuit applies a drive signal having a magnitude that does not cause ejection to the second IC during ejection, and applies a drive signal having a waveform larger than the drive signal to the first IC. Apply
A liquid ejection head characterized by the above-mentioned. The liquid ejection head according to claim 1,
The circuit applies a drive signal of a size that does not cause ejection to the first IC at the timing other than ejection, and does not apply the drive signal to the second IC.
A liquid ejection head characterized by the above-mentioned. The liquid ejection head according to claim 1,
The circuit applies a drive signal of a magnitude that does not cause ejection to the second IC at a timing other than ejection, and applies a drive signal having a waveform larger than the drive signal to the first IC. Applying a signal,
A liquid ejection head characterized by the above-mentioned. The liquid ejection head according to claim 1,
The first IC may be configured such that the first IC has the power consumption per unit time, the power consumption per droplet ejection, the power consumption per print data, and the power consumption per TEC value. Control to be larger than the second IC,
A liquid ejection head characterized by the above-mentioned.   An apparatus for discharging liquid, comprising the liquid discharge head according to claim 1.

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