JP2000094689A - Ink jet recorder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain an ink jet recorder capable of recording at a high speed with low energy. SOLUTION: A rotator 10 comprises a dielectric layer 13, a conductive layer 14 and a protective layer 15 laminated sequentially on the outer circumferential surface of a tubular basic material 11. A large number of pin electrodes are embedded in the basic material 11 while being arranged in the axial and circumferential directions. An array of a plurality of counter electrodes 42 arranged in the axial direction of the rotator 10 is disposed fixedly in the proximity of the inner wall of the rotator 10. The counter electrodes 42 and the pin electrodes on the basic material 11 are disposed at same position in the axial direction of the rotator 10. A thin ink film 23 is formed on the outer circumferential surface of the rotator 10 and when the thin ink film 23 arrives at the position of the counter electrode array and the pin electrode on the basic material 11 arrives at a position facing the counter electrode 42, a high frequency field is applied between the conductive layer 14 and a selected counter electrode 42 in response to an image signal.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dielectric heating method used in printers, facsimile machines, copiers, and the like.
The present invention relates to an electrothermal conversion type ink jet recording apparatus that does not use a nozzle.

[0002]

2. Description of the Related Art Conventionally, an electrothermal conversion type ink jet recording apparatus generates air bubbles in an ink by heating ink in an ink chamber by a heater as disclosed in Japanese Patent Application Laid-Open No. 54-59936. Then, ink droplets are ejected from the nozzles.

FIG. 8 shows a recording head of an electrothermal conversion type ink jet recording apparatus using such a nozzle.
A heater 83 is attached to the outer periphery of a nozzle 82 having an ink discharge port 81 by covering it with a protective layer 84, the nozzle 82 is filled with ink 85, a current is passed through the heater 83, and the electric energy is converted into heat energy. With the thermal energy, the ink 85 in the nozzle 82 is instantaneously heated in about several microseconds, causing the ink 85 to boil and the ink droplets to be ejected from the ink ejection port 81 by the pressure fluctuation due to the film boiling.

However, when such a nozzle is used, there is a problem that the nozzle is clogged. Therefore, an electrothermal conversion type ink jet recording apparatus that does not use a nozzle has been considered.

FIG. 9 shows an electro-thermal conversion type ink jet recording apparatus disclosed in JP-A-61-283552 and JP-A-62-59045, which does not use a nozzle.
An endless belt-shaped recording medium 92 having a large number of small holes (or concave portions) 91 is circulated between a roller 93 and a roller 96 arranged in the ink 95 in the ink chamber 94 to form a small hole in the recording medium 92. When the small holes (or concave portions) 91 filled with ink reach the surface of the heating element array 98 of the thermal head 97, the heating elements of the heating element array 98 are selectively selected. To generate air bubbles in the ink, and the ink droplets are ejected onto the recording paper 99 by the pressure of the air bubbles.

[0006]

However, in the conventional thermal jet type ink jet recording apparatus shown in FIG. 9, the recording medium 92 in the form of an endless belt is conveyed while being immersed in the ink 95 in the ink chamber 94. , Recording medium 92
Should be at least several tens μm to several hundred μm in terms of strength. Further, since the recording medium 92 is slid on the heating element array 98, it is necessary to consider the wear and deterioration of the recording medium 92. In particular, when the recording medium 92 is formed with a concave portion instead of a small hole, the bottom of the concave portion is formed. The wear deterioration of the media portion must be considered.

When a small hole is formed in the recording medium 92 instead of the concave portion, the ink in the small hole can be directly heated by the heating element.
When the thickness is about m or more, the ejection of the ink becomes unstable, but even if the thickness of the recording medium 92 is large to some extent, the recording can be performed efficiently.

On the other hand, when a concave portion is formed in the recording medium 92 instead of a small hole, the ink in the concave portion is heated by heat conduction through the medium portion at the bottom of the concave portion. If the thickness of the medium portion is too large, sufficient heat is not transmitted to the ink in the concave portion, and the recording becomes unstable or impossible. To avoid this, the energy applied to the heating element must be extremely large, and efficient recording cannot be performed. Therefore, in order to perform efficient recording, the thickness of the medium portion at the bottom of the concave portion should be
It must be sufficiently small, such as about several μm or less. However, this causes the recording medium 92 to be damaged early due to the wear of the medium portion at the bottom of the concave portion.

Further, in the conventional thermal jet type ink jet recording apparatus shown in FIG. 9, even if the recording medium 92 is made thick enough to enable high-speed conveyance, the recording medium 92 slides on the heating element array 98. Since the heating element array 98 is worn, it is practically difficult to perform high-speed recording.

In view of the above, the present invention provides an electrothermal conversion type ink jet recording apparatus which uses a dielectric heating method and does not use nozzles, which can efficiently heat ink and perform recording with low energy.
The ink holding member can be transported at a high speed, and high-speed recording can be performed.

[0011]

According to the present invention, there is provided an ink jet recording apparatus comprising: a cylindrical base material in which a number of pin electrodes are embedded in an axial direction and a circumferential direction; A rotating body including the formed dielectric layer, the conductive layer, and the protective layer; and a plurality of opposing electrodes disposed at the same position as the pin electrode in the axial direction of the rotating body, the fixed body being arranged close to the inner wall of the rotating body. And an ink application unit for forming an ink thin film on the outer peripheral surface of the rotating body. When the rotating body rotates to a position where the pin electrode faces the facing electrode, an image signal is generated. Accordingly, by applying a high-frequency electric field between the conductive layer and the selected one of the counter electrodes, the dielectric layer is dielectrically heated at the position of the selected counter electrode, and the ink thin film is formed into a film. Boil, By ejecting ink droplets, the ink droplets, shall be attached to the recording material is facing the counter-electrode array through the rotating body.

In this case, a support is fixedly provided in proximity to the inner peripheral surface of the substrate of the rotator, the counter electrode array is supported on the support, and a gap between the support and the substrate is provided. It is more preferable to fill the space with a lubricating oil and supply the lubricating oil to a minute gap between the counter electrode array and the base material.

It is desirable to use a ferroelectric as the dielectric layer of the rotating body, and it is preferable to use a material having a Curie point of more than 300 ° C. as the ferroelectric.

Further, it is more preferable to form a concave portion for accommodating the ink forming the ink thin film at a position on the surface of the protective layer on the outermost periphery of the rotating body opposite to the pin electrode.

[0015]

In the ink jet recording apparatus according to the present invention, the rotating body having the ink thin film formed on the outermost protective layer is rotated by the ink applying means, and the ink thin film on the rotating body is rotated. When the pin electrode embedded in the base of the rotating body reaches the position of the counter electrode array and reaches the position facing the counter electrode on the counter electrode array, the pin electrode faces the conductive layer on the rotating body according to the image signal. A high frequency electric field is applied between the selected counter electrode on the electrode array.

At this time, since a pin electrode exists between the conductive layer and the selected counter electrode, and the pin electrode is close to the selected counter electrode, the high-frequency electric field is concentrated on the selected region. Applied.

As a result, a selected region of the dielectric layer on the rotating body is dielectrically heated to generate heat due to dielectric loss, and the heat is transferred to the ink on the rotating body via the conductive layer and the protective layer. Heat is applied to selected portions of the film by thermal conduction.

In this case, since the conductive layer and the protective layer can be formed sufficiently thin, there is almost no loss due to thermal diffusion in the direction along the surface of the rotating body, and the heat generated in the dielectric layer by the dielectric heating is selected. Reliable transmission to the ink thin film in the area.

Accordingly, the ink thin film in the selected area is instantaneously heated and film-boils, whereby bubbles are generated in the ink thin film in the selected area, and the bubbles grow and rupture, thereby causing the selected thin film to grow. The ink droplet flies from the ink thin film in the area where the ink droplet flies, and the ink droplet adheres to the recording material.

Therefore, according to the ink jet recording apparatus of the present invention, the ink can be efficiently heated, and the recording can be performed with low energy.
The rotating body as the ink holding member can be rotated at high speed, and high-speed recording can be performed.

When filling the gap between the support for supporting the counter electrode array and the substrate of the rotating body with lubricating oil, and supplying the lubricating oil to the minute gap between the counter electrode array and the substrate. In comparison with the case where an air layer exists between the counter electrode array and the base material, the efficiency of heat generation by dielectric heating is improved, and even if the counter electrode array and the base material come in Abrasion deterioration of the counter electrode array is suppressed, and high-speed recording can be performed more stably and reliably without causing uneven rotation of the rotating body. Furthermore, when applying an electric field, there is no danger of electric discharge occurring in a minute air gap between the counter electrode and the pin electrode, and a high-quality image without image defects due to electric discharge can be formed.

When a ferroelectric is used as the dielectric layer, the spontaneous polarization of the ferroelectric can be reversed, and the dipole is largely rubbed by applying a high-frequency electric field to increase the dielectric loss. Good dielectric heating,
Recording can be performed with lower energy.

Further, when a material having a Curie point Tc at which spontaneous polarization rapidly disappears exceeding 300 ° C. is used as the ferroelectric, a temperature in the range of about 280 to 300 ° C. required for ink-jet recording by dielectric heating. In this case, since the state in which the polarization of the ferroelectric can be inverted is maintained, it is possible to reliably secure recording with lower energy by more efficient dielectric heating as described above.

Further, in the case where a concave portion for accommodating the ink forming the ink thin film is formed at a position on the surface of the protective layer opposite to the pin electrode, the concave portion for accommodating the ink, the pin electrode, and the selection electrode. When the three opposing electrodes face each other, a high-frequency electric field is applied between the conductive layer and the selected opposing electrode, and the protective layer portion at the bottom of the recess is thinner than the other protective layer portions. In addition, the heat generated in the dielectric layer by the dielectric heating is efficiently conducted to the ink in the concave portion in the selected area, and the recording can be performed with lower energy. Moreover, since the pressure propagation during the boiling of the ink in the concave portion is improved, the flying direction of the ink droplet is further stabilized, and a higher quality image can be formed.

[0025]

DESCRIPTION OF THE PREFERRED EMBODIMENTS [First Embodiment] FIGS. 1, 2 and 3 show a first embodiment of an ink jet recording apparatus according to the present invention.
An embodiment will be described.

According to the present invention, a rotating body composed of a cylindrical base material 11 and a dielectric layer 13, a conductive layer 14, and a protective layer 15 sequentially formed on the outer peripheral surface of the base material 11 as an ink holding member. Use 10 and rotate it as described below. A large number of pin electrodes 12 are embedded in the base material 11 in the axial direction and the circumferential direction of the base material 11.

Further, according to the present invention, a plurality of opposing electrodes 42 are arranged in one direction on a substrate 41 to form an opposing electrode array 40, and the opposing electrode array 40 is
0 and is fixedly arranged so that the arrangement direction of the opposing electrodes 42 matches the axial direction of the rotating body 10. The arrangement interval of the opposing electrodes 42 is the same as the arrangement interval of the pin electrodes 12 in the axial direction of the base material 11, and the opposing electrodes 42 and the pin electrodes 12 are located at the same position in the axial direction of the rotating body 10. .

For example, the pin electrode 12 and the counter electrode 42
Are about 30 μm square or about 30 μm diameter, respectively.
The pitch between the pin electrode 12 and the counter electrode 42 in the axial direction of the rotating body 10 is about 40 μm, and about 60 μm.
A resolution equivalent to 0 dpi is obtained.

As a material of the portion other than the pin electrode 12 of the base material 11, a resin which is insulative and has a heat resistant temperature exceeding 300 ° C., for example, a polyimide resin is used. Pin electrode 12
As the base material 11 having embedded therein, a commercially available anisotropic conductive sheet in which metal pins having a diameter of about 20 μm are embedded in the sheet may be used. Further, a similar sheet can be processed and used according to the purpose, such as adjusting the thickness or the diameter of the metal pin. Since the substrate 11 is rotated at a high speed, it is desirable that its thickness be about 70 μm or more in terms of strength.

As the dielectric layer 13, it is preferable to use ceramics, in particular, ferroelectric ceramics having a Curie point exceeding 300 ° C. Specifically, BaTiO ₃ or PbTiO ₃ is used. The thickness of the dielectric layer 13 is formed to 1 μm or more by a vapor deposition method, a sputtering method, or the like.

The conductive layer 14 has a resistivity of 10 ² Ω ·
It is preferable to use a conductive material, typically a metal, having a diameter of not more than cm. Specifically, C, Ni, Au, Ag, Fe, A
1, Ti, Pd, Ta, Cu, Co, Cr, Pt, M
inorganic materials such as o, Ru, W, In, VO ₂ , Ru ₂
O, TaN, SiC, ZrO ₂ , InO, Ta ₂ N, Zr
N, NbN, VN, TiB ₂ , ZrB ₂ , HfB ₂ , Ta
B ₂ , MoB ₂ , CrB ₂ , B ₂ C, MoB, ZrC, V
C, TiC or the like is used. The thickness of the conductive layer 14 is 0.2
A range of about 1 μm to about 1 μm is preferable.

As the protective layer 15, it is preferable to use a material that is insulative and has a heat resistance temperature exceeding 300 ° C., such as silicon resin, fluorine-containing resin and modified resins thereof, silicon oxide and its compounds, silicon nitride, and carbon nitride. Silicon and their compounds, titanium oxide, titanium nitride, titanium carbide and their compounds, tantalum ceramics and their compounds, and other ceramics and their compounds are used. The thickness of the protective layer 15 is preferably 5 μm or less. From the viewpoint of heat conduction, it is desirable that the thickness be thinner, and it is preferable that the thickness be 1 μm or less in a range of a thickness that functions as a protective layer.

As the substrate 41 of the counter electrode array 40,
A material such as alumina or glass, which is insulative and has high heat resistance, is used.

Although not shown in the drawing, the rotating body 10 is rotated in the direction of the arrow in FIG. 1 (clockwise) by a driving rotating body driven by a driving motor in contact with the outer periphery. However, any other method can be used to rotate the rotating body 10.

An ink chamber 21 is provided below the rotating body 10, the ink 22 is supplied into the ink chamber 21, and the ink application roll 30 is rotated with the rotation of the rotating body 10.
Is provided by being immersed in the ink 22. As the ink 22, a commercially available ink jet ink can be used.

As described above, when a part of the outer periphery of the rotating body 10 comes into contact with the ink applying roll 30, the rotating body 10
With the rotation, the ink thin film 23 is formed on the outer peripheral surface of the rotating body 10, that is, on the surface of the protective layer 15. Then, for example, as shown in FIG. 1, a blade 24 is provided at a position after the formation of the ink thin film 23, and excess ink is removed from the outer peripheral surface of the rotating body 10 so that the thickness of the ink thin film 23 becomes 10 to 10. Adjust to about 100 μm. Although not shown, a plurality of rolls can be interposed between the rotating body 10 and the ink application roll 30 to adjust the thickness of the ink thin film 23.

A high-frequency power supply 50 is disposed inside the base material 11 of the rotating body 10, and the ink thin film 23 on the rotating body 10 reaches the position of the counter electrode array 40, and the pin electrodes 12 of the rotating body 10 face each other. When it reaches a position facing the counter electrode 42 on the electrode array 40, the drive circuit (not shown) moves between the conductive layer 14 of the rotating body 10 and the selected one of the counter electrodes 42 according to an image signal. Is applied with a high-frequency electric field.

When the dielectric layer 13 is made of the above-mentioned material, an electric field of up to 30 V / μm can be applied to the dielectric layer 13. The frequency of the applied high-frequency electric field is in the range of 1 to 100 MHz.

As shown in FIG. 1, a recording material 60 such as paper is arranged so as to face the opposing electrode array 40 via the rotating body 10, and a direction corresponding to the rotating direction of the rotating body 10, that is, the rotating body When 10 rotates clockwise in FIG. 1, it is transported leftward in FIG.

When a high-frequency electric field is applied between the conductive layer 14 and the selected one of the counter electrodes 42 as described above, the selected region of the dielectric layer 13 is dielectrically heated, and the dielectric loss is increased. Is generated, and the heat is generated by the conductive layer 14.
And the protective layer 15 is applied by heat conduction to a selected area of the ink thin film 23 on the rotating body 10.

By this heat energy, the ink thin film 23 in the selected area is instantaneously heated from room temperature to 280 to 300 ° C. in a short time of about 0.5 to 10 μsec, and the ink in the selected area is heated. The thin film 23 boils, thereby generating air bubbles in the ink thin film 23 in the selected area, and the air bubbles grow and burst, and ink droplets fly from the ink thin film 23 in the selected area, and the ink drops. Drops adhere to the recording material 60.

For example, in the counter electrode array 40, the counter electrodes 42 are arranged alternately in a so-called staggered manner in two rows, each having a diameter of about 40 μm square or about 40 μm.
Similarly, the pin electrodes 12 of 0 are alternately arranged in two rows.
A plurality of sets may be provided on the entire circumference of the base material 11, and dots may be sequentially and interpolatively recorded on the same line of the recording material 60 by the first column of counter electrodes and the second column of counter electrodes. Good.

Second Embodiment FIGS. 4 and 5 show a second embodiment of the ink jet recording apparatus of the present invention.

In this embodiment, in the ink jet recording apparatus of the first embodiment shown in FIGS. 1 to 3, a cylindrical support 70 is fixed close to the inner peripheral surface of the substrate 11 of the rotating body 10. The counter electrode array 40 is attached to the support 70. Specifically, the outer diameter of the support 70 is smaller than the inner diameter of the substrate 11 by about 500 μm to 1 mm, that is, the gap between the support 70 and the substrate 11 is 500 μm to
The gap between the counter electrode array 40 and the base material 11 is set to about 1 mm or less, and is set to 50 μm or less.

Then, the gap between the support 70 and the substrate 11 is filled with the lubricating oil 75, thereby supplying the lubricating oil 75 to the minute gap between the counter electrode array 40 and the substrate 11. Of course, the lubricating oil 75 is sealed.

As the lubricating oil 75, engine oil, gear oil, machine oil, spindle oil, cup grease, lithium grease, silicone grease, turbine oil, oil +
Water emulsion type, water + glycol type, phosphate ester type, silicone type, brake oil, torque converter oil and the like are used. In order to rotate the rotating body 10 smoothly, the lubricating oil 7
For 5, it is desirable that the viscosity is not so high. In this case, since the lubricating oil 75 has a low relative dielectric constant, it is not dielectrically heated, and the dielectric layer 13 having a high relative dielectric constant is dielectrically heated.

In this case, the substrate 41 of the counter electrode array 40
As long as it is oil-resistant, various materials can be used, but a fluorine-based resin is particularly preferable. A material such as a suitable resin may be coated with a fluorine-based resin. Also, on the inner peripheral surface of the base material 11 that contacts the lubricating oil 75,
It is desirable to coat a fluorine-based resin or the like.

According to this embodiment, the counter electrode array 4
Compared with the case where an air layer exists between the
The efficiency of heat generation by dielectric heating is improved, and even when the counter electrode array 40 and the base material 11 come into contact with each other, the deterioration of the wear of the counter electrode array 40 is suppressed by the effect of the lubricating oil 75, and the rotation of the rotating body 10 becomes uneven. Thus, high-speed recording can be performed more stably and reliably. Furthermore, when an electric field is applied, there is no danger of electric discharge occurring in a minute air gap between the counter electrode 42 and the pin electrode 12, and a high-quality image without image defects due to electric discharge can be formed.

[Third Embodiment] FIGS. 6 and 7 show a third embodiment of the ink jet recording apparatus of the present invention, which is the first embodiment shown in FIGS. In the ink jet recording apparatus according to the second embodiment shown in FIG. 5, ink 23a forming an ink thin film is accommodated in a position facing the pin electrode 12 on the surface of the outermost protective layer 15 of the rotating body 10 respectively. A recess 15a is formed.

The concave portion 15a can be processed by photolithography, laser ablation, or the like using plate making technology in the printing field. Its depth is 10-1
The thickness of the protective layer 15 before processing is set to a value obtained by adding the depth of the concave portion 15a by approximately 1 μm, and
The recess 15a is processed so that the thickness of the protective layer at the bottom of 5a is about 1 μm.

As shown in FIG. 1, an ink thin film 23 is formed on the outer peripheral surface of the rotating body 10 and excess ink is removed by a blade 24 or the like so that the ink 23a is held in the recess 15a. To Then, as described above, the selected region of the dielectric layer 13 is dielectrically heated, so that the ink 23a in the concave portion 15a is heated.
Is film-boiled, and ink droplets are made to fly from inside the concave portion 15 a and adhere to the recording material 60.

According to this embodiment, since the protective layer portion at the bottom of the concave portion 15a is thinner than the other protective layer portions, the heat generated in the dielectric layer 13 by the dielectric heating causes the concave portion 15a in the selected region to be removed. The ink is efficiently transmitted to the ink 23a in the inside, and recording can be performed with lower energy. In addition, since the pressure propagation during boiling of the ink 23a in the recess 15a is improved, the flying direction of the ink droplet is further stabilized, and a higher quality image can be formed.

[0053]

As described above, according to the first aspect of the present invention, an ink can be efficiently heated in an electrothermal conversion type ink jet recording apparatus that uses a dielectric heating method and does not use a nozzle, and has a low energy consumption. , And the ink holding member can be conveyed at a high speed, and high-speed printing can be performed.

According to the second aspect of the present invention, the efficiency of heat generation by dielectric heating is improved as compared with the case where an air layer exists between the counter electrode array and the base material, and the counter electrode array and the base material are separated from each other. Even if they come into contact with each other, abrasion deterioration of the counter electrode array is suppressed by the effect of the lubricating oil, and high-speed recording can be performed more stably and reliably without causing rotation unevenness of the rotating body. Furthermore, when applying an electric field, there is no danger of electric discharge occurring in a minute air gap between the counter electrode and the pin electrode, and a high-quality image without image defects due to electric discharge can be formed.

According to the third aspect of the invention, more efficient dielectric heating can be performed, and recording can be performed with lower energy.

According to the invention of claim 4, as described above,
Recording with lower energy can be reliably ensured by more efficient dielectric heating.

Further, according to the fifth aspect of the invention, recording can be performed with lower energy, and the flying direction of ink droplets can be more stabilized, so that a higher quality image can be formed.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view illustrating an overall configuration of a recording apparatus according to a first embodiment.

FIG. 2 is a sectional view in one direction of a main part of the recording apparatus of the first embodiment.

FIG. 3 is a sectional view in another direction of a main part of the recording apparatus according to the first embodiment.

FIG. 4 is a cross-sectional view illustrating an overall configuration of a recording apparatus according to a second embodiment.

FIG. 5 is a sectional view in one direction of a main part of a recording apparatus according to a second embodiment.

FIG. 6 is a sectional view in one direction of a main part of a recording apparatus according to a third embodiment.

FIG. 7 is a diagram illustrating a protective layer of a recording apparatus according to a third embodiment.

FIG. 8 is a cross-sectional view illustrating a recording head of an electrothermal conversion type ink jet recording apparatus using a conventional nozzle.

FIG. 9 is a diagram showing an overall configuration of a conventional thermal jet type ink jet recording apparatus.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... Rotating body 11 ... Base material 12 ... Pin electrode 13 ... Dielectric layer 14 ... Conductive layer 15 ... Protective layer 15a ... Depression 21 ... Ink chamber 22 ... Ink 23 ... Ink thin film 23a ... Ink 24 ... Blade 30 ... Ink application roll Reference numeral 40: Counter electrode array 41: Substrate 42: Counter electrode 50: High frequency power supply 60: Recording material 70: Support member 75: Lubricating oil

Claims (5)

[Claims] 1. A cylindrical base material in which a number of pin electrodes are embedded in an axial direction and a circumferential direction, and a dielectric layer, a conductive layer, and a protective layer sequentially formed on an outer peripheral surface of the base material. A rotator comprising: a counter electrode array provided with a plurality of counter electrodes arranged at the same position as the pin electrode in the axial direction of the rotator; An ink coating means for forming an ink thin film on an outer peripheral surface, wherein when the rotator rotates to a position where the pin electrode faces the counter electrode, the conductive layer and the counter electrode are selected according to an image signal. By applying a high-frequency electric field between the two, the dielectric layer is dielectrically heated at the position of the selected counter electrode, the ink thin film is boiled, the ink droplets fly, and the ink Drops pass through the rotating body An ink jet recording apparatus characterized by depositing a recording material to face said counter electrode array Te. 2. The ink jet recording apparatus according to claim 1, wherein a support is fixedly provided close to an inner peripheral surface of the base material,
Supporting the counter electrode array on the support, filling a gap between the support and the base with lubricating oil, and supplying a lubricating oil to a minute gap between the counter electrode array and the base. An ink jet recording apparatus characterized by being supplied. 3. The ink jet recording apparatus according to claim 1, wherein a ferroelectric substance is used as said dielectric layer. 4. The ink-jet recording apparatus according to claim 3, wherein the ferroelectric substance has a Curie point higher than 300 ° C. 5. The ink jet recording apparatus according to claim 1, wherein a concave portion for accommodating the ink forming the ink thin film is formed at a position on the surface of the protective layer opposite to the pin electrode. An ink jet recording apparatus characterized in that: