JP3482899B2 - Ink jet recording head and ink jet recording apparatus - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an inkjet recording apparatus for printing an image by depositing ink droplets ejected from electrodes of a recording head on a recording medium, and more particularly to the structure of the inkjet recording head.

[0002]

2. Description of the Related Art An ink jet recording apparatus that ejects a small amount of ink droplets from a minute ejection portion and deposits the ink droplets on a recording medium to print an image guides the ink from an ink tank to each ejection portion, By applying kinetic energy to the ink, ink droplets are ejected from the ejection portion and adhered to the recording medium to form dots. As one of the driving methods for giving kinetic energy to ink, there is a method (electrostatic recording method) in which a voltage is applied between a recording electrode and a common electrode with which a recording medium is in contact and ink is ejected by electrostatic force. This method has been attracting attention as a method for realizing a high-definition inkjet printer since the amount of ink ejected onto a recording medium can be controlled by modulating the pulse width of the voltage applied to the recording electrode.

As an example of such a system, Japanese Patent Laid-Open No. 7-502
In No. 218, an ink in which a coloring agent is dispersed in a solvent at a low concentration is supplied to the surface of the recording electrode, and a voltage is applied to the recording electrode to form an electric field to aggregate and condense the charged coloring agent. The method of ejecting ink from the recording electrodes onto the recording medium is described.

Further, in WO97 / 27058, ink is caused to flow through a channel having a square cross section and a dogleg shape is arranged so as to be closest to a recording medium and provided in the channel. A technique is described in which a voltage is applied to a linear electrode and ink is ejected from the position of the corner of the dogleg shape.

[0005]

In the electrostatic recording method as disclosed in the above publication, ink is circulated and a bias voltage is applied to the recording electrode so that the ink in which the pigment component is concentrated is applied to the tip of the recording electrode. In this method, a pulse voltage is superimposed and applied to the recording electrode in this state, whereby the concentrated ink is ejected onto the recording medium to record an image. Further, in this method, since there are no small holes in the ink ejection portion, clogging of ink is less likely to occur. Therefore, even if the recording head has a linear shape, a defective portion that ink is not ejected is unlikely to occur, so that an inkjet recording apparatus having a line head can be easily realized. A recording apparatus having a line head can record on a recording medium in the entire width direction at the same time, and is thus characterized by high-speed printing.

In this method, the concentrated ink is ejected by applying a voltage in which the pulse voltage is superimposed on the bias voltage to the recording electrode, but when the pulse voltage is applied, all of the concentrated ink is not ejected. In addition, if the ejection of a small amount of concentrated ink on the tip of the recording electrode is repeated, the problem that the ink gradually adheres to the tip of the electrode easily occurs. When the ink adheres to the tip of the recording electrode, the point at which the electric field concentrates is displaced, and the flight direction of the ink is displaced, causing a problem that the image on the recording medium is disturbed.

The above-mentioned special table No. 7-502218, and WO97 / 2705
In JP-A-8, no consideration is given to ink sticking to the tip of the electrode, so that the problem is that the direction of flight of the ink deviates during recording and the image is disturbed.

Further, in the present recording system, if the member for partitioning ink does not exist between the electrodes arranged in a line, the potential applied to the recording electrode is transmitted to the adjacent recording electrode through the ink. Therefore, the intensity distribution of the electric field around the electrode A changes depending on whether or not ink is ejected from an electrode adjacent to one electrode that ejects ink (referred to as the electrode A), and the ink ejection direction from the electrode A is displaced. As in the case of ink sticking, there is a problem that the image is disturbed.

However, in the recording head in which the electrode spacing is narrow even if the member for partitioning the ink is provided, the electric field distribution around the electrode A depends on whether the recording is performed simultaneously in the channel adjacent to the channel in which the electrode A for recording exists. Changes. If the electrodes are set apart from each other so that the change of the electric field distribution does not occur, the number of dots per unit area decreases, and a new problem that a high-definition image cannot be obtained occurs.

In the example of JP-A-7-502218, since there is no partition between the electrodes arranged in a line, a pulse voltage is applied to the recording electrode of the channel adjacent to the electrode A of the recording channel. The intensity distribution of the electric field around the electrode A changes depending on whether or not to do so, and the flight direction of the ink is deviated so that the image is easily disturbed. Further, in the embodiment of WO97 / 27058, there is a member for partitioning ink, but since there is no point where the electric field is concentrated in each channel, the ink ejection point is not fixed at one point, The flight direction is unstable.

The present invention was devised to solve the above-mentioned problems based on the principle of ink ejection in the present recording method.

That is, it is an object of the present invention to provide an ink jet recording apparatus capable of preventing ink from sticking to the tip of the recording electrode and obtaining a high-definition image without shifting the ink landing position due to the deviation of the ejection point. .

[0013]

In order to achieve the above object, the present invention is an inkjet recording apparatus having the following configuration.

A substrate and a tip on the substrate from the substrate
And a discharge member disposed so as to protrude, disposed across the discharge member, it has a recording electrode for discharging ink from said discharge member, and a cover portion for enclosing the recording electrodes, the ink Is supplied toward the tip of the ejection member, and is collected upward from the vicinity of the tip of the ejection member.

With such a structure that the discharge member is surrounded by the covering portion, the ink flow path can be individualized, and the potential applied to the recording electrode for discharging the ink is applied to the surrounding recording electrode or the discharging member through the ink. The electric field distribution is prevented, the electric field distribution in the recording electrode of the channel for ejecting ink is stabilized, and the ink ejection method is stabilized. Also, from the substrate of the discharge member to the individualized ink flow path
Ejecting ink concentrate that was not ejected toward the recording medium when ejecting ink by configuring the flow path so that the ink flows toward the protruding tip direction and is reversed and returned before the flight point. It can be recovered from the tip of the member,
It has become possible to prevent ink from sticking to the tip of the ejection member.

Further, it is possible to provide an ink jet recording apparatus in which the recording heads are arranged in multiple stages so that the ejection members are arranged in a staggered manner and high-speed, high-definition recording is possible.

[0017]

FIG. 4 shows an embodiment of an ink jet recording apparatus according to the present invention. Reference numeral 1 is a housing, 2 is a recording head, 3 is an ink tank for replenishment, 4 is an ink circulation system, 5 is an ink ejection unit, 6 is a common electrode, 7 is a recording medium, 8 is a recording medium conveying path, and 9 is a recording medium. It is a carrier device.

Inside the housing 1 of the ink jet recording apparatus, a recording head 2 for ejecting ink and an ink ejecting section 5 are provided.
A common electrode 6, a recording medium transporting device 9 for passing a recording medium 7 between the ink ejecting portion 5 and the common electrode 6, and a controller for controlling the entire device are built in.

The recording head 2 is provided with an ink tank 3, an ink circulation system 4, and a large number of ink ejection portions 5 arranged in a part of the ink circulation system 4 at appropriate intervals.
Are arranged so as to intersect with the transport direction of the recording medium 7. In an inkjet recording apparatus capable of color printing, the recording heads 2 are arranged at least for each of cyan, magenta, yellow and black.

The recording medium conveying device 9 is a motor (not shown).
The recording medium 7 is conveyed on the recording medium conveying path 8 by being driven by. Normally, a bias voltage of about 1.5 to 2 kV is applied to each recording electrode existing in the ink ejection portion 5 of the recording head 2, and a pulse voltage of about 0.5 kV is applied according to a recording signal. By applying the bias voltage, the coloring material component in the ink circulated in the ink circulation system 4 gathers at the tip of the ink ejection portion 5. Then, when the pulse voltage is applied, the ink is ejected from the tip of the ink ejection unit 5. The ink that is reduced by the ejection is replenished from the ink tank 3. As the ink to be used, for example, one in which a charged pigment is dispersed together with a charge control agent in a petroleum solvent such as isoparaffin having a low viscosity of about 1 to 10 mPa · s can be used. The ink circulation method and the configuration of the ink ejection unit 5 will be described in detail later.

First, the ink circulation system 4 will be described.

FIG. 5 is a diagram showing the structure of the ink circulation system. The ink circulation system 4 includes an ink pool 21, an ink flow rate adjusting chamber 24, a pump 22a controlled by a controller,
22b and piping 23,25,26,27. Then, as shown in FIG. 6 as an example, an ink liquid level detector 32 for detecting the ink liquid level is attached inside the ink flow rate adjusting chamber 24, and the detected value is for controlling the pump 22a. To be fed back. The ink circulation system 4 configured by these is divided into an ink supply system for supplying ink to the ink ejection unit 5 and an ink recovery system for recovering ink from the ink ejection unit 5. In the ink supply system, the ink reservoir 21
The ink stored in the ink is sucked up by the pump 22a and sent to the ink flow rate adjusting chamber 24. Further, since the pump 22a is driven so that the deviation between the detection value of the ink level detector 32 and the target value becomes small, a predetermined amount of ink exists in the ink flow rate adjusting chamber 24.

The ink that has entered the ink flow rate adjusting chamber 24 is
Since the pressure is generated by the potential energy determined by the liquid level difference between the ink flow rate adjusting chamber 24 and the ink ejecting section 5, the ink flows toward the ink ejecting section 5 in which the ejection electrodes are arranged, so that a constant pressure and flow rate can always be obtained.

In addition, in the ink recovery system, the ink that has passed through the ink ejecting section 5 is pumped into the ink reservoir 2 by the pump 22b.
Recover to 1.

When printing is performed, the circulation of these inks is stabilized.

The ink circulation system 4 shown here is an example, and another method may be used as long as it supplies and recovers an appropriate amount of ink to the ink ejection portion.

Next, the structure of the ink ejecting section 5 will be described.

FIG. 2 is a structural diagram of the vicinity of the ink ejection portion 5 of the ink jet recording apparatus used in the present invention. On the head substrate 10 made of an insulating material such as glass having a low dielectric constant,
There are ejection members 12b and 12c having a convex portion at the tip, and partition walls 13 installed to partition the ejection members 12b and 12c to form an ink chamber. The part that becomes the ink chamber is U-shaped, and the above U-shaped part has
For example, the recording electrode 11b exists so as to surround the ejection member 12b. The ink is supplied to the area surrounded by the partition wall 13,
When the pulse voltage is applied to the recording electrode 11b according to the image signal, the ink in which the pigment component is collected is ejected by the ejection member 12b.
It is ejected toward the recording medium 7 from the tip of. This phenomenon is
The potential applied to the recording electrode 11 is transmitted through the insulating ink, the discharge member 12 also has a potential almost equal to that of the recording electrode 11, and the electric field at the tip of the discharge member 12 closest to the recording medium becomes the strongest, resulting in electrostatic force. Ink is ejected toward the recording medium. When the height of the partition wall 13 is made higher than the height of the ejection member 12, the ink easily flows in the individualized ink flow paths.

The recording electrode 11 may be arranged at a position in contact with the ink or inside the partition wall 13. However, depending on the ink used, if the recording electrode 11 is in contact with the ink, the recording electrode 11 may be arranged. Since ink may adhere to the surface, in that case, the recording electrode 11 is installed inside the partition wall 13 so as not to come into contact with the ink to prevent the ink from sticking to the surface of the recording electrode 11.

Of the supplied ink, the ink that has not been ejected toward the recording medium 7 is recovered from the ejection position by the recovery means (pump). This situation will be described with reference to FIG.

FIG. 1 is a sectional view taken along the dotted line aa 'in FIG. (Note that FIG. 2 is a cross-sectional view taken along the dotted line bb 'in FIG. 1.) In the present embodiment, as shown by the arrow, the proper amount of ink supplied from the ink supply unit is the ejection member. 1
2 flows from the root to the tip and is collected in the vicinity of the tip so that the advancing direction is opposite. Further, since the ejection member is sandwiched between the partition walls 13, the ink circulates in the individualized area. . With such an ink circulation structure, the ink can be stably circulated, and stable ink ejection can be performed. Further, a part of the partition wall 13 is 50 to 50 mm from the head substrate 10.
It projects by 250 μm. When the protrusion length is shorter than 50 μm, ejection points may be formed on the head substrate 10, resulting in improper ink ejection. Also, the protrusion length is 25
When the thickness is 0 μm or more, there is a problem that the circulating ink leaks from the head substrate and contaminates the inside of the recording apparatus. Further, the discharge member 12 is 20 to 100 more than the partition wall 13.
It is projected by μm. If it exceeds this range, the reproducibility of the size of the ejected dots becomes poor. The cause will be described with reference to FIG.

FIG. 12 shows the ejection member 1 during ink circulation.
2 shows an ink curve shape (hereinafter referred to as an ink meniscus) formed between 2 and the tip of the partition wall 13. The ink meniscus 18 is formed by the surface tension of the ink, and plays a role of guiding the ink to the tip of the ejection member 12. FIG. 12A shows the ejection electrode 12
It shows the ink meniscus when a bias voltage is applied to. When the bias voltage is applied, an electrostatic force is applied to the pigment component in the ink, and the pigment component gathers toward the tip of the ejection member 12. When a pulse voltage corresponding to the image signal is applied thereto, the electrostatic force further works and the ejection member 1
2 The pigment in the ink moves to the leading end together with the ink solvent and is ejected toward the recording medium. FIG. 12B shows
The ink meniscus at the time of ink ejection is shown. If the step difference between the ejection member 12 and the partition wall 13 is 20 μm or less, the amount of ink that reaches the tip of the ejection member 12 is too large, and the ink ejection amount at the time of pulse application may be excessive, resulting in unstable image quality. . If the step exceeds 100 μm, it becomes difficult to supply the ink to the tip of the ejection member 12, the ink ejection amount becomes too small, and an unstable image is obtained.

Here, the movement of the pigment in the ink at the tip of the ejection member 12 during printing will be described. After the pulse voltage is superimposed on the bias voltage based on the image information and applied to eject the ink, the ink meniscus is shown in FIG.
Returns to the state of FIG. When the ink returns to the root direction of the ejection member 12, the pigment concentrate remaining on the tip of the ejection member 12 is collected along with the circulation flow of the ink. This can be accomplished by by inverting recovered ink circulation direction somewhat at the base side of the distal end portion of the discharge member 12, the discharge member 12
A force is drawn to draw the dark ink from the tip of the ink into the circulating portion, and the adhered matter is prevented from adhering to the tip of the ejection member 12. When the adhered matter is generated at the tip of the ejection member 12, one end of the adhered matter serves as the ejection point, which causes a problem that the ejection direction of the ink is changed and the image is disturbed. Since no adhered matter is generated at the tip of the member 12, the ink is ejected in a predetermined direction and the image is not disturbed.

As described above, the partition wall 13 and the discharge member 12
By projecting the tip of the ink, the electric field is concentrated at the tip of the ejection member 12, and the ink is supplied and collected so that only a necessary amount of the ink exists at the ejection point, so that the ink is ejected with a small electrostatic force. be able to.

The recording head of the present invention performs recording while circulating the ink, but since the ink is collected by using a pump, the protrusion amount of the partition wall and the ejection member falls within the above range. If set, the ink ejection direction can be any direction from the vertical direction to the direct downward direction.

Next, a method of increasing the ink collecting power to increase the above effect will be described with reference to FIG.

FIG. 3 is a sectional view taken along the line cc 'in FIG. A thin insulating layer 14 having an ink inlet 17 and a V-shaped cut 15 is provided on the ejection member 12 and the partition wall 13.
Exists. The ink enters the flow path surrounded by the partition wall 13 from the ink inflow port 17 and flows along the ejection member 12 as a cover of the insulating layer 14. Ink is collected from the V-shaped notch 15 that is located immediately above the tip of the ejection member 12, and the ink flow velocity is increased particularly in the portion where the notch width is narrow, and the ink is strongly recovered.

FIG. 11 is a view of the recording head as seen from the recording medium 7 side, showing the flow of ink in the vicinity of the ink ejection portion.

Next, an example of a method of manufacturing this recording head will be described.

First, a groove is formed on the head substrate 10 such as glass having a thickness of about 1 mm by a dicing saw. The groove has a width of about 0.2 to 0.5 mm and a depth of about 0.2 mm, exists in the direction of arrangement of the ejection members to be the flying portion, and has a length longer than the lateral width of the line head. After finishing all the steps described below, the head substrate 10 is cut by making a groove from the opposite side of the groove with a dicing saw in the same manner.
This is performed to cause the ejection member 12 to protrude from the head substrate 10.

After forming a groove in the head substrate 10, a metal such as Al or Ni is sputtered on the head substrate 10 by about 1 μm.
m, a photoresist is applied, and the photoresist layer is exposed through a photomask having a predetermined electrode pattern. Then, it develops and a photoresist pattern is formed and an electrode pattern is formed by etching.
The width of the electrodes here is 10 to 50 μm.

Next, a thickness of 20 is formed on the entire surface of the head substrate 10.
A polyimide film of about 50 μm is attached with a laminator. Similar to the case where the electrode pattern is formed, a desired partition wall pattern and guide member pattern are formed by etching using a photoresist and a photomask.
Here, the width of the ejection member is 20 to 50 μm, and the interval between the ejection members is about 150 to 500 μm. The ink flow path between the partition wall and the ejection member is about 10 to 50 μm.

Next, the head substrate is placed in a plating tank of Ni or the like, and the electrode patterns are energized to deposit metal layers up to the height of the partition pattern and the guide member by plating. After that, a polyimide film having a thickness of about 20 to 50 μm is pasted thereon again with a laminator, and the ink inlet 1 is formed by using a photoresist and a photomask as in the previous step.
7 and the insulating layer 14 provided with the V-shaped notch 15 is manufactured. Finally, a groove is formed by a dicing saw along the groove on the front surface of the head substrate 10 along the groove on the front surface, the head substrate 10 is folded at that portion, and the folded surface is obliquely polished to complete.

Head substrate 1 manufactured by the above-described process
The head 19 as shown in FIG. 1 is completed by adhering the lid 19 having the ink flow path formed on the upper side of 0.

Next, the structure of the lid 19 in which the ink flow path is formed will be described with reference to FIGS.

FIG. 8 is a top view of the head as seen from the lid 19 side. A pipe 25 for supplying ink and a pipe 26 for discharging ink are connected to the lid 19. FIG. 9 shows an overview of the connection between the pipes 25 and 26 and the lid 19.

FIG. 9A shows a cross section taken along the dotted line AA 'in FIG. 8, and FIG. 9B shows a cross section taken along the dotted line BB'.
The pipes 25 and 26 have an inner diameter of about 2 mm. Since the ink flow path in the head portion is considerably smaller than 2 mm and the ink ejection portion is wide in the width direction, the ink flow path is gradually narrowed in the height direction and widened in the width direction. The ink can be circulated without stagnation by gradually changing the size of the flow path. By eliminating the stagnation of the ink, it is possible to prevent the pigment in the ink from settling, and it is possible to prevent clogging of the ink circulation system.

Further, FIG. 10A shows a cross section taken along the dotted line d-d 'in FIG. 9, and FIG. 10B shows a cross section taken along the dotted line e-e'. The reason for such a structure is to provide the ink supply system and the ink recovery system so that the flow paths do not overlap each other, and the ink supply system and the ink recovery system are located on the right side of the dotted line cc 'in FIG. The structure is divided into upper and lower parts, and the ink passage is widened in the width direction of the head on the left side of cc '.

In the head manufactured as described above, the distance between the ink ejection portions (the distance between the guide members) is 150 to 500 μm.
Since it is as wide as m, it is difficult to obtain a high-definition image. If the distance between the ink ejecting portions is narrower than 150 μm, even if the ink flow paths are individualized, the electric field distribution is disturbed by the influence of the pulse voltage applied to the adjacent electrodes, so that the ink ejecting direction is bent. The problem occurs. FIG. 7 shows a method for solving such a problem.

FIG. 7 shows the line head shown in FIG. 11 stacked in three stages. Three stages is an example, and the number of stages n is the desired dot spacing d1 during printing and the spacing d2 between the guide members 12.
It is determined by the relationship with and is represented by d2 = d1 × n. The n-stage line heads are stacked so that the guide members are arranged in a staggered manner so that dots can be printed at a desired pitch in the direction perpendicular to the recording medium conveyance direction. By superposing and printing the line heads in this way, a high-definition image can be recorded at high speed.

FIG. 1 shows the ink circulation in this configuration.
3 will be used for the explanation.

FIG. 13 is a cross sectional view of the line head shown in FIG. The structure is a structure in which the structure shown in FIG. The ink is circulated from the ink supply system pipe 25 into n stages to supply the ink to each line head, collect the ink circulated in each line head, and collect it from the ink recovery system pipe 26. .

By doing so, it is possible to reduce the dot interval in the direction perpendicular to the recording medium conveyance direction during printing, and by adjusting the dot printing cycle and recording conveyance speed in the recording medium conveyance direction, a high-definition image can be obtained. It is possible to realize a recording device that can print various images.

Therefore, according to the present invention, by enclosing the ejection member with the partition wall, the ink flow path is individualized for each channel, and the potential applied to the recording electrode of the channel for ejecting ink is transmitted to the surrounding channels through the ink. Can be prevented. Therefore, there is an effect that a high-definition image can be recorded in which the ink ejection direction is stable and the image is not disturbed, without being influenced by the adjacent recording electrodes.

In addition, ink is made to flow from the root of the ejection member toward the tip of the individualized ink flow path, and a component that returns to the root direction before the flight point is provided.
A force for drawing the dark ink from the tip of the ejection member to the circulation portion is generated so that new ink is constantly supplied to the tip of the ejection member to prevent the ink from sticking to the tip of the ejection member. Therefore, since the adhered matter does not adhere to the tip of the ejection member, the ejection direction of the ink becomes a predetermined direction, and a high-definition image without image distortion can be recorded.

Further, by arranging the heads having the ink circulation system in which the ink ejection portions are distributed in a staggered manner in multiple stages, the number of dots per unit area on the recording medium is increased,
There is an effect that a high-definition image can be recorded at high speed.

[0057]

That is, the present invention can provide an ink jet recording apparatus which can prevent ink from sticking to the tip of the recording electrode and can obtain a high-definition image without shifting the ink landing position due to the deviation of the ejection point.

[Brief description of drawings]

FIG. 1 is a diagram showing an embodiment of an inkjet head of the present invention.

FIG. 2 is a diagram showing an embodiment of a cross section of an inkjet head of the present invention.

FIG. 3 is a diagram showing another embodiment of the cross section of the inkjet head of the present invention.

FIG. 4 is a diagram showing an embodiment of an inkjet recording apparatus according to the present invention.

FIG. 5 is a diagram showing an ink circulation system of the inkjet head of the present invention.

FIG. 6 is a diagram illustrating an ink pressure adjusting method for an ink circulation system according to the present invention.

FIG. 7 is a diagram showing another embodiment of the inkjet head of the present invention.

FIG. 8 is a diagram showing an example of the upper surface of the inkjet head of the present invention.

FIG. 9 is a diagram showing an example of a cross section of an inkjet head of the present invention.

FIG. 10 is a diagram showing an example of a cross section of an inkjet head of the present invention.

FIG. 11 is a diagram illustrating circulation of ink flowing through the ejection member of the present invention.

FIG. 12 is a diagram illustrating a state of an ink meniscus formed in the ink ejection portion of the present invention.

FIG. 13 is a diagram showing a cross section of another embodiment of the inkjet head of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Housing, 2 ... Recording head, 3 ... Ink tank, 4 ... Ink circulation system, 5 ... Ink discharge part, 6 ... Common electrode, 7 ... Recording medium, 8 ... Recording medium conveyance path, 9 ... Recording medium conveyance device,
10 ... Head substrate, 11, 11a, 11b, 11c ... Recording electrode, 12, 12b, 12c ... Ejection member, 13 ... Partition, 14 ... Insulating layer, 15, 15b, 15c ... V-shaped notch, 17 ... Ink flow Inlet, 18 ... Ink meniscus, 19 ... Lid, 21 ... Ink pool, 22a, 22b ...
Pumps, 23, 25, 26, 27 ... Piping, 24 ... Ink flow rate adjusting chamber, 32 ... Ink liquid level detector.

─────────────────────────────────────────────────── ─── Continued Front Page (72) Inventor Shigetaka Fujiwara 7-1, 1-1 Omika-cho, Hitachi-shi, Ibaraki Hitachi Ltd. Hitachi Research Laboratory (72) Inventor Atsushi Onose 7-chome, Omika-cho, Hitachi-shi, Ibaraki No. 1 in Hitachi Research Laboratory, Hitachi, Ltd. (56) References Japanese Patent Laid-Open No. 10-100411 (JP, A) Japanese Patent Laid-Open No. 9-314867 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB) Name) B41J 2/06

Claims (6)

(57) [Claims] And 1. A substrate, a discharge member tip on the substrate are arranged so as to protrude from the substrate, is arranged across the discharge member, the recording electrodes for ejecting ink from said ejection member An ink jet recording head, comprising: a coating portion that encloses the recording electrode; and the ink is supplied toward the tip of the ejection member and collected upward from the vicinity of the tip of the ejection member. 2. An ink jet recording head according to claim 1, high jet recording head than the height of the height of the cover portion is the discharge member. 3. The ink jet recording head according to claim 1 or 2, the ink jet recording head entrance shape of the flow path for recovering the ink from the tip vicinity of the discharge member is V-shaped. 4. A substrate, a discharge member tip on the substrate are arranged so as to protrude from the substrate, is arranged across the discharge member, the recording electrodes for ejecting ink from said ejection member An ink supply path that supplies the ink to the ejection member, and an ink recovery path that recovers ink from the vicinity of the tip of the ejection member. An inkjet recording head in which a cross-sectional shape of the ink recovery path is gradually narrowed toward the ejection member. 5. A substrate, and a discharge member disposed on the substrate, is arranged across the discharge member, and the recording electrodes to eject ink from the ejection member, the coating enclosing said recording electrodes And a recording head having a circulation unit that circulates the ink, an ink chamber that stores the ink, a common electrode that faces the ejection member, and a conveyance path that conveys the recording medium. Inkjet recording device. 6. The ink jet recording apparatus according to claim 5, wherein in the recording head, the ejection members are arranged in a staggered pattern,
An ink jet recording apparatus that is formed by stacking several layers.