JP2010142997A - Inkjet recording head, and inkjet recorder - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an inkjet recording head preventing a delivery port from being clogged. <P>SOLUTION: This inkjet recording head has an ink delivery substrate 11 formed with the plurality of delivery ports 5 for delivering ink dissolved or dispersed with a coloring agent in a solvent, an ink supply port 7 for supplying the ink, and an ink flow passage 3 for communicating the respective delivery ports 5 with the ink supply port 7. The ink delivery substrate 11 includes an electric heating element 8 for delivering the ink from each delivery port 5. The ink delivery substrate 11 is formed with a plurality of evaporation ports 4 arranged in the vicinity of the delivery ports 5, and for holding a liquid containing a component of the solvent under the condition where a liquid level of the liquid is exposed, a liquid supply port 6 for supplying the liquid, and a loop-like flow passage 9 for communicating each evaporation port 4 with the liquid supply port 6. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an ink jet recording head and an ink jet recording apparatus that perform recording on a recording medium by discharging ink.

  An ink jet recording apparatus performs recording on a recording medium by landing ink ejected from an ejection port of an ink jet recording head on the recording medium. Ink for an inkjet recording head is generally used in which a coloring material such as a dye or pigment is dissolved or dispersed in a solvent such as water or alcohol.

  In an ink jet recording head using such an ink, the solvent contained in the ink evaporates from the ejection port during the resting time (the time during which the ink is not ejected), and the ink staying in the ejection port is a coloring material. As the concentration of increases, the viscosity increases. As a result, the ejection port is clogged, and the ink is not normally ejected after the pause time, resulting in recording failure.

  Ink jet recording heads that prevent such discharge port clogging are described in Patent Document 1, Patent Document 2, and Patent Document 3.

  In the ink jet recording head described in Patent Document 1, a holder made of rayon, polyester, metal fibers, or a mixture of two or more kinds of fibers is provided on the discharge surface of an orifice plate in which discharge ports are formed. It has been. Then, the liquid in the tank is supplied to the holding body from the tank filled with the liquid containing the solvent component of the ink used for recording on the recording medium.

  In this ink jet recording head, when the liquid evaporates from the holder supplied with the liquid from the tank, the partial pressure of the evaporated solvent component in the air in the vicinity of the discharge port causes the solvent of the ink at the installation environment temperature of the ink jet recording apparatus. The saturated vapor pressure of the components is maintained. Thereby, evaporation of the solvent component of the ink from the ejection port can be suppressed.

  In the ink jet recording head described in Patent Document 2, a groove is formed on the surface of the orifice plate so as to surround the entire row of ejection ports. Then, excess ink adhering to the discharge surface of the orifice plate during the recording operation is collected in the groove by wiping.

  In this ink jet recording head, the solvent component of the ink collected in the groove evaporates, so that the partial pressure of the evaporated solvent component in the air near the ejection port is kept high. Thereby, since the solvent component of the ink can be prevented from evaporating from the ejection port, clogging of the ejection port can be prevented.

In the ink jet recording head described in Patent Document 3, an ink whose main component is water is used. This ink jet recording head is configured such that high-humidity air is supplied to the vicinity of the discharge port from a humidifier provided outside, and the humidity of the air in the vicinity of the discharge port is kept high. This makes it possible to prevent moisture, which is the main component of the ink solvent, from evaporating from the ejection port, thereby preventing the ejection port from being clogged.
JP 2003-145783 A JP 2001-347664 A JP 2000-79696 A

  However, in the ink jet recording head described in Patent Document 1, when the holding body provided on the discharge surface of the orifice plate absorbs the liquid supplied from the tank, it may expand by about 1 mm.

  Usually, when the ink jet recording head ejects ink onto a recording medium during a recording operation, the distance between the ejection surface of the orifice plate and the recording medium is set to about 1 mm. However, when the distance between the ejection surface of the orifice plate and the recording medium during the recording operation of the ink jet recording head is set to 1 mm, if the recording operation is performed while the holding body is expanded, the holding body May come into contact with the recording medium.

  Therefore, in this ink jet recording head, in order to avoid the holder from coming into contact with the recording medium, it is necessary to set a larger distance between the ejection surface of the orifice plate and the recording medium during the recording operation. Increasing the distance between the ejection surface of the orifice plate and the recording medium during the recording operation causes a drop in the landing accuracy of the ink droplets ejected from the ejection surface of the orifice plate on the recording medium. This causes a reduction in image quality recorded on the recording medium.

  Further, when the distance between the ejection surface of the orifice plate and the recording medium is increased, the energy required to land the ink droplet on the recording medium with a desired accuracy is increased accordingly, and the power consumption of the ink jet recording head is reduced. Increase.

  In the ink jet recording head described in Patent Document 2, there is a limit to the amount of ink that can be collected in the groove formed on the surface of the orifice plate, and when the amount is exceeded, new ink cannot be collected.

  Therefore, the amount of the solvent component to be evaporated in the ink collected in the groove decreases as the solvent component evaporates, and eventually the solvent component is depleted. As described above, in this ink jet recording head, the partial pressure of the evaporated solvent component in the air in the vicinity of the discharge port cannot be kept high with time, and thus the evaporation of the solvent component of the ink from the discharge port is sufficiently suppressed. Can not do.

  Further, when the solvent component of the ink in the groove evaporates and depletes, the color material is solidified and fixed in the groove. Since the color material fixed in the groove cannot be easily removed, this ink jet recording head is troublesome to maintain.

  Further, in this ink jet recording head, the effect of keeping the partial pressure of the evaporated solvent component in the air in the vicinity of the discharge port high cannot be expected unless the operation is performed until a sufficient amount of ink is collected in the groove. Therefore, there is a case where clogging of the ejection port cannot be sufficiently suppressed when a sufficient amount of ink is not collected in the groove.

  In the ink jet recording head described in Patent Document 3, a humidifier needs to be provided separately, and a fan for sending high-humidity air to the vicinity of the discharge port, a tube for guiding high-humidity air to the vicinity of the discharge port, and the like It is necessary to add a new configuration. This leads to an increase in the size of the entire apparatus, which causes problems such as a large installation area and increased power consumption.

  The present invention has been made in view of such problems, and provides an ink jet recording head and an ink jet recording apparatus that can prevent clogging of discharge ports and can stably form a high-quality image on a recording medium. It is intended to do.

  In order to achieve the above object, an ink jet recording head according to the present invention includes a plurality of ejection ports for ejecting ink in which a color material is dissolved or dispersed in a solvent, an ink supply port to which the ink is supplied, and the ejection ports. And an ink flow path that communicates with the ink supply port, and the ink discharge substrate includes an ink discharge substrate that includes an energy generation unit that discharges ink from each discharge port. A plurality of evaporation ports arranged in the vicinity of the discharge port and holding the liquid containing the solvent component in a state where the liquid surface of the liquid is exposed, a liquid supply port to which the liquid is supplied, and each of the evaporations A liquid flow path for communicating the mouth and the liquid supply port is formed.

  ADVANTAGE OF THE INVENTION According to this invention, the inkjet recording head and inkjet recording device which can prevent clogging of an ejection opening can be provided.

Next, embodiments of the present invention will be described with reference to the drawings.
(First embodiment)
FIG. 1 is a perspective view showing the interior of an ink jet recording apparatus capable of mounting an ink jet recording head according to a first embodiment of the present invention.

  The ink jet recording apparatus has a chassis 100 that forms the skeleton of the apparatus. The chassis 100 is composed of a plurality of plate-like metal members having a predetermined rigidity. This ink jet recording head is configured as a single unit by attaching various components and the like to the chassis 100.

This ink jet recording apparatus has a carriage 103 which is a mounting member for mounting the ink jet recording head 46 according to this embodiment. In addition, the inkjet recording apparatus controls the operation of the carriage 103, the recording medium conveyance system for conveying the recording medium in the direction A in FIG. 1, the recovery unit 109 that recovers the inkjet recording head 46 after the recording operation, and the carriage 103. And a linear encoder 113.
[Inkjet recording head]
First, the ink jet recording head 46 according to the present embodiment will be described.

  The inkjet recording head 46 has a plurality of tanks filled with ink and the like, and a tank holder that holds each tank in a detachable manner.

  FIG. 2 is a perspective view of the tank holder of the ink jet recording head according to the present embodiment. The tank holder 20 has a contact substrate 21 that is electrically connected to the carriage 103 when the inkjet recording head 46 according to the present embodiment is mounted on the carriage 103. The contact substrate 21 is bonded and fixed to the tank holder 20.

  The tank holder 20 includes an alumina pedestal 10, four ink ejection substrates 11, 12, 13, and 14 provided on the alumina pedestal 10, each ink ejection substrate 11, 12, 13, 14 and a contact substrate 21. And a flexible substrate 22 to be electrically connected.

  FIG. 3 is an exploded perspective view illustrating the inkjet recording head according to the present embodiment as seen through. The ink jet recording head 46 includes tanks 41, 42, 43, 44, 45 that can be attached to and detached from the tank holder 20. The tanks 41, 42, 43, and 44 are ink tanks filled with cyan (C), magenta (M), yellow (Y), and black (K) inks, and the tank 45 is a solvent used for the ink. A liquid tank filled with a liquid containing components.

  The liquid filled in the tank 45 may have the same component as the solvent used for the ink or may have a different component. However, it is desirable that the liquid filled in the tank 45 contains the main component that is contained most in the solvent used in the ink.

  Connection ports 31, 32, 33, 34, and 35 are formed in the tank holder 20. When the ink tanks 41, 42, 43, 44 are attached to the tank holder 20, ink can be supplied from the ink tanks 41, 42, 43, 44 to the connection ports 31, 32, 33, 34. Further, when the liquid tank 45 is attached to the tank holder 20, the liquid can be supplied from the liquid tank 45 to the connection port 35.

  The ink jet recording head 46 is configured to be replaceable for each tank when the ink or liquid in the ink tanks 41, 42, 43, 44 and the liquid tank 45 is used up.

  FIG. 4 is a perspective view of the ink discharge substrate of the ink jet recording head according to the present embodiment. FIG. 5 is a schematic configuration diagram of the ink ejection substrate shown in FIG. 4 as viewed from the coating resin layer side. 6 is a cross-sectional view taken along the line AA ′ of FIG. 5 of the ink discharge substrate shown in FIG. For convenience of explanation, FIG. 4 shows a part of the coating resin layer 2 in a cutaway manner, and FIGS. 4 and 5 show a part of the coating resin layer 2 in a transparent manner. 4, 5, and 6 show the ink discharge substrate 11, the ink discharge substrates 12, 13, and 14 are configured in the same manner as the ink discharge substrate 11.

  The ink discharge substrate 11 has a Si substrate 1, and a coating resin layer 2 is formed on the Si substrate 1. An ink supply port 7 penetrating in the thickness direction is formed in the Si substrate 1. In addition, on the surface of the Si substrate 1, electrothermal elements 8 as energy generating portions are provided in two rows with the ink supply port 7 interposed therebetween. Discharge ports 5 for discharging ink are formed in portions of the covering resin layer 2 arranged on the electrothermal element 8. In the ink jet recording head 46 according to the present embodiment, the two rows of ejection ports 5 are arranged at intervals of 42.3 μm (equivalent to 600 dpi) in each row.

  Each ejection port 5 is connected to an ink flow path 2 provided for each ejection chamber 5, and each ink flow path 2 is disposed on the ink supply port 7 and communicates with the ink supply port 7. Each is connected to a common liquid chamber. Accordingly, each ejection port 5 is communicated with the ink supply port 7.

  The ink supplied to the ink supply port 7 is sent to each discharge port 5 via the common liquid chamber and the ink flow path 2 of each discharge port 5 by capillary action. The ink is sent to each ejection port 5 until the liquid level of the ink is equal to the height of the ejection surface of the coating resin layer 2 that is the surface on which the ink is ejected to the external space. Then, as shown in FIG. 6, the liquid level of the ink in the ejection port 5 is caused by the surface tension of the ink in the ejection port 5 or the negative pressure that pulls the ink from the ejection port 5 toward the ink supply port 7. Stays near the discharge surface.

  In this state, when a voltage pulse is applied by a drive circuit (not shown) connected to the electric heating element 8 in the ink flow path 2 and the electric heating element 8 generates heat, a film is formed on the ink near the electric heating element 8. Boiling occurs, and ink is discharged from the discharge port 5 to the external space by the generation pressure of bubbles.

  Further, a liquid supply port 6 penetrating in the thickness direction is formed in the Si substrate 1. As shown in FIG. 5, the coating resin layer 2 is formed with a loop-shaped flow path 9 that is a liquid flow path formed in a loop shape so as to surround the entire row of the discharge ports 5. The loop channel 9 is in communication with the liquid supply port 6. The coating resin layer 2 has a plurality of evaporation ports 4 penetrating from the loop-shaped flow path 9 to the external space. The evaporation ports 4 are arranged along the rows of the discharge ports 5. In the ink jet recording head 46 according to the present embodiment, two rows of the evaporation ports 4 are arranged at intervals of 200 μm in each row.

  The liquid supply port 6 is supplied with a liquid containing a solvent component used for ink from a liquid tank 45 (see FIG. 3). The liquid supplied to the liquid supply port 6 is sent to the evaporation port 4 through the loop-shaped channel 9. The liquid is sent to the evaporation port 4 until the height of the liquid level is equal to the height of the discharge surface of the coating resin layer 2. Then, the liquid level of the liquid in the evaporation port 4 is discharged from the evaporation port 4 as shown in FIG. 6 by the surface tension of the liquid on the discharge surface of the evaporation port 4 or the negative pressure that pulls the liquid back to the liquid supply port 6 side. Stay near the surface. At this time, since the liquid level of the liquid in the evaporation port 4 is exposed to the discharge surface side of the coating resin layer 2 and is in contact with air, the liquid in the evaporation port 4 evaporates from the liquid level.

  As described above, in the ink jet recording head 46 according to this embodiment, the liquid containing the solvent component of the ink can be evaporated in the vicinity of the ejection port 5. As a result, the partial pressure of the evaporated solvent component in the air in the vicinity of the ejection port 5 is maintained at about the saturated vapor pressure of the solvent component of the ink at the installation environment temperature of the ink jet recording apparatus. Therefore, in the ink jet recording head 46 according to the present embodiment, the evaporation of the solvent component of the ink from the ejection port 5 can be suppressed, and the ejection port 5 can be prevented from being clogged.

  Next, a method for manufacturing the ink discharge substrate 11 will be briefly described.

  First, a soluble resin is applied on the Si substrate 1 provided with the electrothermal element 8 and the drive circuit and wiring, and dissolved in the portion where the ink flow path 2, the common liquid chamber and the loop flow path 9 are arranged. A possible resin layer is formed. Then, a clothing resin layer 2 is formed on the Si substrate 1 so as to cover the soluble resin layer.

  Next, a mask for the pattern of the discharge port 5 and a mask for the pattern of the evaporation port 4 are formed on the surface of the clothing resin layer 2 with a material having high resistance to oxygen plasma by photolithography. Then, the coating resin layer 2 is treated with oxygen plasma through the mask of the pattern of the discharge port 5 and the mask of the pattern of the evaporation port 4 to dry-etch, thereby forming the discharge port 5 and the evaporation port 4 in the coating resin layer 2. .

  Next, the ink supply port 7 and the liquid supply port 6 are formed in the Si substrate 1 by anisotropic etching with strong alkali. Finally, the soluble resin layer is eluted from the ink supply port 7 to form the ink flow path 2, the common liquid chamber, and the loop flow path 9.

  By using such a process, the ink discharge substrate 11 can be manufactured as one chip.

  FIG. 7 is an exploded perspective view of the alumina pedestal and the ink discharge substrate of the ink jet recording head according to the present embodiment. In FIG. 7, the inside of the alumina pedestal 10 is shown through.

  In the alumina pedestal 10, ink flow paths 15, 16, 17, 18 and a liquid flow path 19 are formed. Each of the ink discharge substrates 11, 12, 13, and 14 is attached to the alumina pedestal 10 so that the ink supply port 7 communicates with the ink flow paths 15, 16, 17, and 18, respectively. Further, at this time, the liquid flow path 19 inside the alumina pedestal 10 communicates with the liquid supply port 6 of each ink discharge substrate 11, 12, 13, 14.

  As shown in FIG. 2, when the alumina pedestal 10 is attached to the tank holder 20, the ink flow paths 15, 16, 17, 18 inside the alumina pedestal 10 are connected to the connection ports 31, 32, 33, 34 (FIG. 3). Connected). The liquid flow path 19 inside the alumina pedestal 10 is connected to the connection port 35.

With the above configuration, in the ink jet recording head 46 according to the present embodiment, the ink supplied from the ink tanks 41, 42, 43, 44 is discharged from the ink discharge substrates 11, 12, 13, 14. It can be discharged from the outlet 5. Further, the liquid supplied from the liquid tank 45 can be supplied to the evaporation ports 4 of the respective ink discharge substrates 11, 12, 13, and 14.
[Recording medium transport system]
The recording medium transport system of the ink jet recording apparatus shown in FIG. 1 is a mechanism for transporting the recording medium so that recording can be performed on the recording medium.

  The recording medium conveyance system includes a recording medium holding unit 101 that holds the recording medium, a conveyance roller 104 that conveys the recording medium, and a discharge roller 105 that discharges the recording medium on which predetermined recording has been performed. And a tray 106 for holding the discharged recording medium. The transport roller 104 is driven by the driving force transmitted from the transport motor 107 via the gear 108.

  The conveyance roller 104 conveys the recording medium to a position facing the carriage 103 so that the inkjet recording head 46 mounted on the carriage 103 can perform recording on the recording medium.

During a recording operation on the recording medium, the carriage 103 is reciprocated in the direction of arrow B in FIG. Further, during the recording operation, the transport roller 104 shifts the recording medium in the direction of arrow A in FIG. 1 by a predetermined distance for each scan of the inkjet recording head 46. Thereby, recording can be performed on the entire recording area of the recording medium.
[Recovery Department]
The recovery unit 109 of the ink jet recording apparatus shown in FIG. 1 suppresses evaporation of the solvent component of the ink from the discharge port 5 by capping the discharge surface of the ink jet recording head 46 when not in use.

In addition, the recovery unit 109 sucks the ejection surface with the ejection surface of the inkjet recording head 46 capped after the recording operation is completed, and removes or flows the ink in the ejection port 5 that has been thickened by evaporation of the solvent component during the rest period. The air bubbles accumulated in the road are discharged.
[carriage]
The carriage 103 of the inkjet recording apparatus shown in FIG. 1 performs a reciprocating motion for scanning the inkjet recording head 46 along the guide shaft 114. The carriage 103 is driven by the driving force of the carriage drive motor 110 being transmitted via a pulley (not shown) and a belt (not shown).

An ink jet recording head 46 is detachably mounted on the carriage 103. When the ink jet recording head 46 is mounted on the carriage 103, the contact substrate 21 provided on the tank holder 20 of the ink jet recording head 46 is electrically connected to a metal terminal assembled on the carriage 103.
[Linear encoder]
The ink jet recording apparatus shown in FIG. 1 is provided with a linear scale 112 in which 1200 graduations are engraved at equal intervals in one inch along the moving range of the carriage 103. The carriage 103 is provided with a linear encoder 113, and light emitted from the light emitting unit of the linear encoder 113 is irradiated to the linear scale 112 when the carriage 103 moves.

  Then, the light emitted from the linear encoder 113 is repeatedly reflected and transmitted by the scale part on the linear scale 112 and the part other than the scale. An optical signal is obtained by detecting light reflected by the scale portion of the linear scale 112 by a light receiving unit (not shown) of the linear encoder 113. This optical signal is converted into an electric signal representing the position or moving speed of the carriage 103 by a signal processing circuit (not shown), and based on this information, the movement control of the carriage 103 and the timing of ejecting ink from the inkjet recording head 46 are performed. Is controlled.

  In controlling the timing of ejecting ink from the inkjet recording head 46, when the inkjet recording head 46 scans by movement of the carriage 103, a predetermined ejection timing signal is output to the driver of the inkjet recording head 46. The ink jet recording head 46 ejects ink in accordance with this signal, whereby dots corresponding to predetermined image data can be formed at predetermined positions on the recording medium.

  For example, when the linear encoder 113 is set to cause the inkjet recording head 46 to form dots each time the scale portion of the linear scale 112 is detected, recording can be performed at a resolution of 1200 dpi in the scanning direction of the inkjet recording head 46. .

  In the inkjet recording head 46 according to this embodiment, an electrothermal element is used to generate energy for ejecting ink. However, the inkjet recording head can eject ink from the ejection port. It only has to be configured.

  That is, in the case of an ink jet recording head configured to eject ink from the ejection port, the effect of preventing clogging of the ejection port can be obtained by suppressing evaporation of the solvent component of the ink from the ejection port. .

For example, an ink jet recording head uses a piezoelectric element instead of an electrothermal element, and is configured to eject ink from an ejection port using displacement of the piezoelectric element generated by applying a voltage pulse to the piezoelectric element. Also good.
(Second Embodiment)
FIG. 8 is a schematic configuration diagram of an ink discharge substrate of an ink jet recording head according to the second embodiment of the present invention as viewed from the coating resin layer side. For convenience of explanation, FIG. 8 shows a part of the coating resin layer 2a through. The ink jet recording head according to the present embodiment is configured in the same manner as the ink jet recording head 46 according to the first embodiment except for the evaporation port of the ink discharge substrate.

  In the ink jet recording head according to the present embodiment, evaporation ports 4a having different diameters are formed in the coating resin layer 2a.

  In this ink jet recording head, since the frequency of ink ejection is low, that is, the print duty is small and the average pause time is long, the evaporation port 4a in the vicinity of the ejection port 5a that is likely to be clogged has a large diameter. The liquid in the evaporation port 4a having a large diameter has a large amount of evaporation per unit time because the area of the liquid surface in contact with air is large.

  Therefore, the partial pressure of the evaporated solvent component in the air in the vicinity of the discharge port 5a where clogging is likely to occur can be kept particularly high, and the evaporation of the solvent component of the ink from the discharge port 5a is effectively suppressed. can do. Therefore, it is possible to prevent the discharge port 5a having a small print duty from being clogged.

  In this ink jet recording head, the frequency of ink ejection is large, that is, the print duty is large, and the average pause time is short, so that the evaporation port 4a in the vicinity of the ejection port 5a that is less likely to be clogged is formed with a small diameter. . Thereby, the amount of liquid evaporated from the evaporation port 4a in the vicinity of the discharge port 5a where clogging hardly occurs can be reduced, and the amount of liquid supplied to the evaporation port 4a can be decreased. Therefore, this ink jet recording head can reduce the cost for the liquid.

  In the ink jet recording head according to the present embodiment shown in FIG. 8, the ejection port 5a arranged at the center of the row of ejection ports 5a has a large print duty, and the ejection ports arranged at both ends of the row of ejection ports 5a. 5a has a small print duty. Therefore, the evaporation port 4a in the vicinity of the discharge port 5a arranged at the center of the row of the discharge ports 5a is formed with a large diameter, and the evaporation port in the vicinity of the discharge port 5a arranged at both ends of the row of the discharge ports 5a. 4a has a small diameter.

1 is a perspective view of an ink jet recording apparatus on which an ink jet recording head according to a first embodiment of the present invention can be mounted. It is a perspective view of the tank holder of the ink jet recording head concerning this embodiment. 2 is an exploded perspective view of an ink jet recording head according to the present embodiment. FIG. FIG. 4 is a perspective view of an ink discharge substrate of the ink jet recording head shown in FIG. 3. FIG. 5 is a schematic configuration diagram of an ink discharge substrate illustrated in FIG. 4. FIG. 6 is a cross-sectional view of the ink ejection substrate shown in FIG. 4 along the line AA ′ in FIG. 5. FIG. 4 is an exploded perspective view of an alumina pedestal and an ink discharge substrate of the ink jet recording head shown in FIG. 3. It is a schematic block diagram of the ink discharge board | substrate of the inkjet recording head which concerns on the 2nd Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Si substrate 2 Clothing resin layer 4 Evaporation port 5 Ejection port 6 Liquid supply port 7 Ink supply port 8 Electrothermal element 10 Alumina base 11, 12, 13, 14 Ink ejection substrate 15, 16, 17, 18 Ink flow path 19 Liquid flow Path 20 Tank holder 21 Contact substrate 22 Flexible wiring 31, 32, 33, 34 Connection port 35 Connection port 41, 42, 43, 44 Ink tank 45 Liquid tank 46 Inkjet recording head

Claims (4)

A plurality of ejection ports for ejecting ink in which a color material is dissolved or dispersed in a solvent; an ink supply port to which the ink is supplied; and an ink flow path for communicating each of the ejection ports and the ink supply port. In an inkjet recording head having an ink ejection substrate that is formed and includes an energy generation unit that ejects ink from each ejection port.
The ink ejection substrate is disposed in the vicinity of the ejection port, a plurality of evaporation ports that hold the liquid containing the solvent component in a state where the liquid surface of the liquid is exposed, and the liquid to which the liquid is supplied An ink jet recording head, comprising: a supply port; and a liquid flow path for communicating each of the evaporation ports and the liquid supply port.   2. The evaporation port in the vicinity of the discharge port that discharges the ink at a low frequency is formed to have a larger diameter than the evaporation port in the vicinity of the discharge port that discharges the ink at a high frequency. The inkjet recording head described.   An ink tank filled with the ink; and a liquid tank filled with the liquid. The ink is supplied from the ink tank to the ink supply port, and the liquid is supplied from the liquid tank to the liquid supply port. The ink jet recording head according to claim 1, wherein the ink jet recording head is supplied.   An ink jet recording apparatus comprising the ink jet recording head according to claim 1 and performing recording by ejecting ink onto a recording medium.

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