JPH04176652A - Ink jet recording device - Google Patents

Abstract

PURPOSE:To ensure that stable data recording is constantly performed by providing an electricity discharging device for discharging electricity from an ink ejection orifice surface at an opposite side to the ejection orifice surface of a recording device. CONSTITUTION:A blade 38 slides over a surface opposed to a medium for recording of a head holder 18 after passage over an ink ejection orifice surface. Then a brush for discharging electricity 41 is caused to slide over an area including the opposed surface, so that an electric charge generated on the front surface of the head holder 18 and the ink ejection orifice surface can be eliminated rapidly due to a sliding contact between the brush and the blade 38. Subsequently, the chances of foreign matter such as paper powder and materials afloat in the air sticking to the discharge orifice surface 14 or the front of the head holder are reduced significantly. In addition, the electricity discharging brush 41 of an electricity discharging device 40 is no longer contaminated by materials sticking to the ink ejection orifice surface 14 and the head holder 18 and thus electricity discharging effects are maintained significantly.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an inkjet recording apparatus that performs recording by ejecting ink from a recording means onto a recording material.

[Conventional technology]

Used in conjunction with computers, word processors, etc.
Alternatively, a recording device such as a printer, a copying machine, or a facsimile machine used alone is configured to form an image on a recording material such as paper or a thin plastic plate based on image information.

The recording device may be an inkjet type,
It can be divided into wire dot type, thermal type, laser beam type, etc.

Among these, the inkjet type (inkjet recording device) performs recording by ejecting ink from the recording means onto the recording material, and can record high-definition images at high speed, and is a non-impact type. It has advantages such as low noise, easy printing, and easy recording of color images using multicolor ink.

In particular, inkjet recording means (recording heads) that use heat as ink ejection energy are capable of etching,
Through semiconductor manufacturing processes such as vapor deposition and sputtering,
By forming electrothermal transducers, electrodes, liquid channel walls, top plates, etc. on a substrate, it is possible to easily manufacture a device having Takada's unique liquid channel arrangement (discharge port arrangement).

If you continue recording using this type of recording means,
Satellite minute ink mist (fog ink) generated when ink is ejected from each liquid path adheres to and accumulates on or near the ejection port surface, preventing ink from being ejected from each ejection port, or causing problems in recording. This may stain the surface of the material and deteriorate the quality of the recorded image.

Conventionally, in order to solve the problem caused by the ink mist, air suction cracks were created near the ejection orifice surface of the recording means. A suction method is provided in which the ink mist is sucked out, and a flexible blade is periodically brought into sliding contact with the portion of the recording means that faces the recording material to wipe off the adhering ink droplets that are generated due to the adhesion and accumulation of the ink mist. wiping methods have been adopted.

[Technical problem to be solved by the invention] However,
In the suction method using the air suction device described above, the device configuration is large, the noise is large, and the flight direction of the ejected ink droplets is affected by the air flow, resulting in the dot position on the recording material being shifted. There was a technical issue that needed to be solved.

In addition, in the above-mentioned wiping method, the part that makes sliding contact with the flexible blade is charged by friction, and the static electricity causes
Foreign matter such as paper powder or floating matter in the air may adhere to the surface of the discharge port or the sliding prefix near it, and as a result, the blade and the foreign matter may damage the surface of the discharge port or cause the discharge to occur without being removed. There is a technical problem to be solved in that the foreign matter remaining on the exit surface disturbs the ejection direction of the ink droplets, making it impossible to record dots at accurate positions on the recording material.

The present invention has been made in view of such technical problems, and an object of the present invention is to always maintain stability by preventing paper dust and floating objects from adhering to the ejection port surface of the recording means and its vicinity. An object of the present invention is to provide an inkjet recording device that can perform high-speed recording.

[Means for Solving the Problems] The present invention provides an inkjet recording apparatus that performs recording by discharging ink from a recording device onto a recording material, and in which a discharge port surface of the recording device is provided with a charge-eliminating device on the side opposite to the discharge port surface of the recording device. An inkjet recording device that is configured to include a static eliminating means for this purpose, can prevent paper dust and floating matter from adhering to the ejection port surface of the recording means and its vicinity, and can always perform stable recording. It provides:

〔Example] Hereinafter, the present invention will be described in detail with reference to the drawings.

First Embodiment: FIG. 1 is a schematic diagram of a first embodiment of an inkjet recording apparatus according to the present invention.

In FIG. 1, a continuous recording material 13 wound into a roll is conveyed via a guide roller 2L22 by the frictional rotational force of a conveyance roller 23 consisting of a pair of rollers.
The recorded portion is sequentially discharged in the direction of arrow 24.

Recording means (recording heads) IY, IM, IC, IB are placed on the front surface of the recording material 13 between the upper and lower guide rollers 21 and 22.
A recording area, that is, a recording section is provided.

In this recording section, a guide shaft 25 is arranged parallel to the guide rollers 21 and 22, and a carriage 27 is guided and supported along the guide shaft 25 so as to be able to reciprocate. The recording means (recording head)
A head holder 18 that positions and holds IY, IM, and IC1IB is mounted.

The illustrated inkjet recording apparatus is for color recording, and the recording means IY, IM, and IC2IB are supplied with inks of different colors, yellow, magenta, cyan, and black, from corresponding ink tanks. .

In the following explanation, when referring to the entirety of the four recording means (recording heads) IY, IM, and IC1IB, or any one of them, it is simply referred to as the recording means (recording head). I will show you.

The recording material 13 is intermittently conveyed by the recording width of the recording means 1, and while the recording material 13 is stopped, each recording means 1 is scanned in the direction of arrow P by the carriage 27.
An image is recorded on the recording material 13 by ejecting ink from each recording means 1 based on an image signal.

The carriage 27 is reciprocated by a carriage motor 28 via a timing heald 26 , the conveyance roller 23 is rotationally driven by a conveyance motor 29 , and the operations of these motors 28 and 29 are controlled by a control circuit 30 .

Further, the image data (signal) 35 consisting of red, green, and blue is processed by the image processing circuit 31 into yellow, magenta, cyan,
It is converted into a black image signal, and the control circuit 30 controls each flexible cable 2 according to this image signal.
Each recording means (
A drive signal is output to the recording head) 1.

Each recording means 1 performs recording by ejecting ink from a corresponding ejection port in response to a respective drive signal.

The recording means (recording head) (2) is a recording means (recording head) that discharges ink using thermal energy, and is equipped with an electrothermal transducer for generating thermal energy.

Further, the recording means 1 performs recording by ejecting ink from an ejection port using pressure changes caused by growth and contraction of bubbles due to film boiling caused by thermal energy applied by the electrothermal converter. It is.

FIG. 2 is a partially cutaway perspective view schematically showing the structure of the ink ejection section of the recording means (recording head) 1. As shown in FIG.

In FIG. 2, a recording means (recording head) 1 includes an electrothermal transducer 3, an electrode 4, which is formed on a substrate 2 through a semiconductor manufacturing process such as etching, vapor deposition, and sputtering.
It is composed of a liquid channel wall 5, a top plate 6, etc.

Recording ink 12 is supplied into the common liquid chamber 8 of the recording means 1 from an ink storage section (such as an ink tank) (not shown) through an ink supply pipe 7 .

Reference numeral 9 indicates a connector for the ink supply pipe 7.

The ink supplied into the common liquid chamber 8 is supplied into each liquid path 10 by capillary action, and is stably held by forming a meniscus at the discharge port 11 at the tip of each liquid path.

In each liquid path 10, electrothermal converters 3 for heating the ink in the acid liquid path are arranged in one-to-one correspondence.

Note that the reference numeral 14 indicates a discharge port surface (face surface) on which the discharge ports 11 are formed.

Here, when each electrothermal converter 3 is selectively driven (energized) according to the image signal, the ink facing the energized electrothermal converter 3 is heated, and bubbles grow due to film boiling of the ink. Ink is ejected from the corresponding ejection port 11 using the pressure change caused by the contraction.

In FIG. 1, a head cleaning means 39 and a static eliminating means are located within the movement range of the recording means (recording head) l and outside the recording area, and at a position facing the ejection orifice surface 14 of the recording means 1. 40 are arranged.

The head cleaning means 39 utilizes the movement of the carriage 27 to slide into contact with the ejection port surface 14 of the recording means 1 and the front surface of the head holder 18, and wipes away ink mist and paper powder adhering to these surfaces. ) is provided with a blade 38 for doing so.

The blade 38 is formed of a flexible plate-like member such as a rubber-like elastic material.

The static eliminating means 40 uses the area in which the blade 3 slides, that is, the movement of the carriage 27, to remove the discharge port surface 14 of the recording means 1 and the front surface of the head holder 18 (the surface facing the recording material 13). ), and the friction band on these surfaces [# electric brush for removing static electricity] [!
! A conductive brush) 41 is provided.

This static elimination brush 41 is formed of an electrically conductive static elimination brush made of ultrafine fibers made of synthetic fiber polyester and metal fiber stainless steel, for example, and its vertical length L is the vertical length l of @SS Giblades 38. (L>l).

Therefore, as shown in FIG. 1, the charge eliminating means 40 is disposed downstream of the head cleaning means 39 in the recording operation direction (direction of arrow P) of the carriage 27 on which the recording means I is mounted.

According to the configuration described above with reference to FIG. 1, carry.

By moving the screw 27 in the direction of arrow P, after the blade 38 comes into sliding contact with the ejection port surface 14 and the surface of the head holder 18 that faces the recording material, the charge removal blank 41 is moved into the area including these surfaces. Since the sliding contact is made, it is possible to quickly remove the static electricity generated on the ejection port surface 14 and the front surface of the head holder 18 due to the sliding contact with the blade 38. Therefore, foreign matter such as paper dust and airborne objects can be removed from the Discharge port surface 1
4 and the front of the head holder were significantly reduced.

Furthermore, the static eliminating brush 4I of the static eliminating means 40 is no longer contaminated by deposits on the discharge port surface 14 or the head holder 18, and the durability of the neutralizing effect can be greatly improved.

Second Embodiment: FIG. 3 is a schematic diagram of a second embodiment of an inkjet recording apparatus according to the present invention.

In FIG. 3, a head cleaning means 39 is located within the movement range of the recording means (recording head) I and outside the recording area, and at a position facing the ejection opening surface 14 of the recording means I.
and static eliminating means 4o are provided.

The head cleaning means 39 is similar to the first embodiment,
Using the movement of the carriage 27, it slides into contact with the ejection port surface 14 of the recording means 1 and the front surface of the head holder 18,
It is equipped with three blades for wiping off ink mist and paper dust adhering to these surfaces.

The blade 38 is formed of a flexible plate-like member such as a rubber-like elastic material.

In this embodiment, the static eliminator 4o utilizes the area in which the blade 3 slides, that is, the movement of the carriage 27, and the ejection opening surface 14 of the recording means 1 and the front surface of the head holder 18 (the area to be recorded). surface facing material 13)
Friction zones on these surfaces that slide into contact with! It is equipped with a conductive static elimination brush roller 42 for removing static electricity (static electricity) and a cleaning member 43 for cleaning the static electricity elimination brush roller 42. The static elimination brush roller 42 can be rotationally driven by a motor 44. .

The static eliminating brush roller 42 is in contact with the cleaning member 43, and is arranged so as to come into sliding contact with the cleaning member 43 when rotated.

In this embodiment as well, the static eliminating brush roller 42 is formed of a conductive brush made of ultra-fine fibers, and its length in the vertical direction is the same as the length in the vertical direction of the blade 38 of the cleaning means 39! It is set larger (L>1).

Further, as shown in FIG. 3, the static eliminating means 40 is disposed downstream of the head cleaning means 39 in the recording operation direction (direction of arrow P) of the carriage 27 on which the recording means I is mounted.

In this embodiment, the brush serving as the static eliminating means is formed of a rotatable roller-shaped member 42, and the static eliminating brush roller 42 is rotated, for example, when the power is turned on or every few scans of the recording operation by the recording means 1. As such, it is rotated at a predetermined timing by the control circuit 30, and comes into sliding contact with the ejection port surface 14 of the recording means 1 and the recording material facing surface of the head holder 18 to eliminate static electricity.

Further, the static eliminating blank roller 42 is soiled with ink or the like during the static eliminating operation, but two spots of this stain are immediately wiped off by rotating and sliding contact with the static neutralizing blank roller cleaning member 43.

The static elimination brush roller cleaning member 43 is preferably made of a material that easily absorbs ink etc. adhering to the static elimination brush 42, such as polymer foam such as foamed formal resin, or low density polyethylene or high density polyethylene. It is preferable to use one made of a thermally sintered polymeric porous material.

The second embodiment shown in FIG. 3 differs from the first embodiment described above in the points explained above, but other parts have substantially the same structure, and corresponding parts are designated by the same reference numerals. A detailed explanation thereof will be omitted.

According to the second embodiment, in addition to obtaining the same effects as in the first embodiment, since the static elimination brush roller 42 is always cleaned by the static elimination brush roller cleaning member 43, the discharge of the recording means 1 is performed. Exit surface 14 and head holder 1
An effect was obtained in which the durability of the static elimination effect on the surface facing the recording material of No. 8 could be further improved.

Third Embodiment: FIG. 4 is a schematic block diagram of a third embodiment of the inkjet recording apparatus according to the present invention, and FIG. 5 is a portion showing the recording means 1 and the cleaning and neutralizing means 47 of the recording apparatus of FIG. 4. FIG.

In FIGS. 4 and 5, recording means (recording head)
A cleaning and neutralizing means 47 is disposed at a position 1 within the movement range of 1 and outside the recording area, and facing the ejection port surface 14 of the recording means 1 .

The cleaning and neutralizing means 47 includes a conductive rubber blade 45 and a conductive blade holder 46 that is electrically connected to the rubber blade 45 and electrically grounded.

That is, in this embodiment, a head cleaning means for cleaning the ejection opening surface 14 of the recording means (recording head) l and the recording material facing surface of the head holder 18, and the ejection opening surface 14 are provided.
A static eliminating means for eliminating static electricity from the front surface of the head holder is constituted by an integrated cleaning static eliminating means 47 using the conductive rubber blade 45.

The conductive rubber blade 45 is made of, for example, gold such as Au, Ag, Ni, Cu, or AI as a conductive filler.
It can be formed of a flexible blade made of conductive urethane rubber or the like having a composition in which XFA, carbon, graphite, etc. are dispersed.

The operation is as follows.

As shown in FIG. 5, a conductive rubber blade 45 is applied to the entire surface of the discharge port surface 14 of the recording means (recording head) 1 and the surface facing the recording material of the head holder 18 by utilizing the movement of the carriage 27. By bringing them into frictional sliding contact, the discharge port surface 1
4. Wipe off any foreign matter such as ink mist or dust that has adhered to the front surface of the head holder.

In this case, since the blade 45 for cleaning the recording means is electrically conductive and electrically grounded by the conductive blade holder 46, the recording material on the ejection opening surface 14 of the recording means 1 and the recording material on the head holder 18 is removed. Frictional contact with the opposing surface does not cause these surfaces to become electrically charged.

Therefore, even after the rubber blade 45 is brought into sliding contact and wiped clean, foreign matter such as paper powder or airborne matter will not adhere to the discharge port surface 14 or the front surface of the head holder due to electrostatic force.

The third embodiment shown in FIGS. 4 and 5 differs from the first embodiment described above in the points explained above, but other parts have substantially the same structure, and corresponding parts are denoted by the same reference numerals. The detailed explanation will be omitted.

According to the third embodiment, as in the first embodiment described above, foreign matter such as paper powder and airborne matter is removed from the discharge port surface 14.
In addition to the effect of greatly reducing the chances of the static electricity sticking to the front surface of the head holder, by integrating the cleaning means and the static elimination means of the recording means 1, the number of parts in the device configuration can be reduced and the device can be made very compact. This effect was obtained.

In each of the above embodiments, the case of a color inkjet recording apparatus including a plurality of recording means (recording heads) 1 for recording in different colors has been described as an example, but the present invention
It can be used regardless of the number of recording means, such as an inkjet recording device that records with one recording means, or an inkjet recording device for gradation recording that uses multiple recording means of the same color but different density. Similar effects can be achieved.

Furthermore, in each of the above embodiments, the case of an inkjet recording apparatus of a serial recording type in which the recording means (recording head) 1 is mounted on the carriage 27 that moves along the recording material has been described as an example. The invention can be similarly applied to a line-type inkjet recording device that uses a line recording means with a length corresponding to the whole or part of the recording area in the width direction of the recording material, and can achieve the same effect. It's something you get.

Furthermore, the recording means (recording head) 1 in each of the above embodiments may be a replaceable cartridge type recording means that integrates a recording head and an ink tank, or
Recording means having various structures can be used, such as a recording means having a structure in which the recording head and the ink tank are separated and connected via a coupler and a tube, for example.

Note that the present invention can be applied to an inkjet recording device using electric devices such as piezo elements, for example. It can be applied to devices using recording means (recording nozzles) using R-converters, etc., and particularly provides excellent effects in bubble jet recording devices proposed by Canon Co., Ltd.

This is because, according to such a system, higher recording density and higher definition can be achieved.

As for typical configurations and principles thereof, it is preferable to use the basic principles disclosed in, for example, US Pat. No. 4,723,129 and US Pat. No. 4,740,796.

This method can be applied to both the so-called on-demand type and the continuous type, but especially in the case of the on-demand type, it is difficult to adapt to the sheet holding the liquid (ink) and the liquid path. By applying at least one drive signal to the disposed electrothermal transducer that corresponds to the recorded information and provides a rapid temperature rise exceeding nucleate boiling,
The electrothermal converter generates thermal energy, and the recording means (
This method is effective because film boiling is caused on the heat-active surface of the recording head (recording head), and as a result, bubbles in the liquid (ink) can be formed in one-to-one correspondence with this drive signal.

Due to the growth and contraction of these bubbles, liquid (
ink) to form at least one droplet.

If this drive signal is in the form of a pulse, bubble growth and contraction will occur immediately and appropriately, so liquids with particularly excellent responsiveness (
Ink) can be ejected, which is more preferable. As this pulse-shaped drive signal, those described in US Pat. No. 4,463,359 and US Pat. No. 4,345,262 are suitable.

Further, if the conditions described in US Pat. No. 4,313,124 concerning the temperature increase rate of the heat acting surface are adopted, even more excellent recording can be achieved.

As for the configuration of the recording head, in addition to the combination configuration of the ejection port, liquid path, and electrothermal converter (straight liquid flow path or right-angled liquid flow path) as disclosed in the above-mentioned specifications, thermal effect U.S. Pat. No. 4,558,333 and U.S. Pat. No. 4,459,60 disclose a configuration in which the portion is arranged in a bending region.
A configuration using the specification of No. 0 is also included in the present invention.

In addition, Japanese Patent Application Laid-open No. 123670 of 1982 discloses a configuration in which a common slit is used as a discharge part for a plurality of electrothermal converters, and a hole that absorbs pressure waves of thermal energy is disclosed. The present invention is also effective as a configuration based on Japanese Patent Application Laid-Open No. 138461 of 1981, which discloses a configuration in which a discharge portion corresponds to a discharge portion.

That is, regardless of the form of the recording head, according to the present invention, recording can be performed reliably and efficiently.

Furthermore, the present invention can be effectively applied to a full-line type recording head that has a length corresponding to the maximum width of a recording medium that can be recorded by a recording apparatus.

Such a recording head may have a configuration in which the length is satisfied by a combination of a plurality of recording heads, or a configuration as a single recording head formed integrally.

In addition, even serial types such as top strips can be electrically connected to the device body and ink can be supplied from the device body by being attached to the recording head fixed to the device body or to the device body. The present invention is also effective when using a replaceable chip type recording head or a cartridge type recording head in which an ink tank is integrally provided in the recording head itself.

Further, it is preferable to add recovery means for the recording head, preliminary auxiliary means, etc., which are provided as a configuration of the recording apparatus, to the present invention because the effects of the present invention can be further stabilized.

Specifically, these include a camping means, a cleaning means, a pressurizing or suction means, an electrothermal transducer or a separate heating element, or a preheating means for the recording head using a combination thereof. It is also effective to perform a preliminary ejection mode in which ejection is performed separately from printing in order to perform stable printing.

In addition, regarding the type and number of recording heads installed, for example, in addition to only one head for single-color ink, there are also multiple heads installed for recording multiple inks with different recording colors and densities. It may be provided.

That is, for example, the recording mode of the recording apparatus is not only a recording mode for mainstream colors such as black, but also whether the recording head is configured integrally or by a combination of multiple heads.
Although any of these may be used, the present invention is also extremely effective for devices equipped with at least one of multiple colors of different colors or full colors created by mixing colors.

Additionally, in the embodiments of the present invention described above,
Although ink is described as a liquid, it is an ink that solidifies at room temperature or below, but softens or liquefies at room temperature, or in the inkjet method, the ink itself must be stored at a temperature of 30°C or higher and 70°C or lower. Since the temperature is generally controlled so that the viscosity of the ink is within a stable ejection range, it is sufficient that the ink is in a liquid state when the recording signal is applied.

In addition, the temperature rise caused by thermal energy can be actively prevented by using it as energy to change the state of the ink from a solid state to a liquid state, or ink that solidifies when left unused is used to prevent ink evaporation. In any case, the ink is liquefied by applying thermal energy in accordance with the recording signal, and the liquid ink is ejected, or the ink already begins to solidify by the time it reaches the recording medium. The present invention is also applicable when using ink that is liquefied only by thermal energy.

In such cases, the ink is held in a liquid or solid state in the recesses or through holes of the porous sheet, as described in JP-A-54-56847 or JP-A-60-71260. , it may also be in a form that faces the electrothermal converter.

In the present invention, the most effective method for each of the above-mentioned inks is to implement the above-mentioned film boiling method.

In addition, the inkjet recording apparatus according to the present invention may be used as an image output terminal for information processing equipment such as a computer, or may be used as a copying apparatus combined with a reader or the like, or as a facsimile apparatus having transmitting and receiving functions. It may also be something that is harvested.

〔Effect of the invention〕

As is clear from the above description, according to the present invention, in an inkjet recording apparatus that performs recording by ejecting ink from a recording means onto a recording material, an ejection orifice surface of the ejection orifice surface of the recording means is placed on the opposite side of the ejection orifice surface of the recording means. Inkjet recording is equipped with a static eliminating means to eliminate static electricity, so it is possible to prevent paper dust and floating matter from adhering to the ejection port surface of the recording means and its vicinity, and it is possible to perform stable recording at all times. Equipment is provided.

[Brief explanation of drawings]

FIG. 1 is a schematic perspective view showing the structure of a first embodiment of an inkjet recording apparatus according to the present invention, and FIG. 2 is a partially broken section schematically showing the structure of the ink ejection part of the recording means in FIG. FIG. 3 is a schematic perspective view showing the configuration of a second embodiment of the inkjet recording apparatus according to the present invention, and FIG. 4 is a schematic perspective view showing the configuration of the third embodiment of the inkjet recording apparatus according to the present invention. , FIG. 5 is a schematic partial perspective view showing the recording means and the cleaning and neutralizing means in FIG. 4. Below, symbols representing main components in the drawings are listed. l, IY, IM, IC, IB... Recording means (
recording head), 3-・--・electrothermal converter, 8-・-
Common liquid chamber, 10--liquid path, 11--discharge port, 12--ink, 13--recording material, 1
4.--Discharge port surface, 18--.. Hesit holder, 23-.-. Conveyance roller, 24..- Recorded material conveyance direction, 25-..・-Guide shaft, 27-
--- Carriage, 2 B --- Carriage motor, 29 --- Conveyance motor, 30 --- Control circuit, 38 --- Flexible blade, 39 --- Head cleaning means , 40---Static elimination means, 41--Static elimination brush, 42--Static elimination brush roller, 43---Cleaning member, 44--Motor, 45---Conductive blade, 46. . - Blade holder, 47... Cleaning and neutralizing means. Figure 1 Figure 2 Figure 3 Figure 4

Claims (6)

[Claims] (1) In an inkjet recording apparatus that performs recording by ejecting ink from a recording means onto a recording material, a charge eliminating means for eliminating charge from the discharge port surface of the recording means is provided on the opposite side of the discharge port surface of the recording device. Features of inkjet recording device. (2) The inkjet recording apparatus according to claim 1, wherein the static eliminating means is formed of a static eliminating brush. (3) The inkjet recording apparatus according to claim 1, wherein the static eliminating means is formed of a static eliminating brush roller. (4) The inkjet recording apparatus according to claim 1, wherein the static eliminating means is formed of a conductive rubber blade. (5) A claim characterized in that the recording means is an inkjet recording means that ejects ink using thermal energy, and is equipped with an electrothermal converter for generating thermal energy. Item 1. The inkjet recording device according to item 1. (6) The recording means is characterized in that the ink is ejected from the ejection port by utilizing a state change caused by the growth of bubbles due to film boiling caused by the thermal energy applied by the electrothermal converter. 1. The inkjet recording device according to 1.