JPH0752401A - Inkjet recording head storage method - Google Patents

Abstract

(57) [Summary] [Purpose] The ink jet recording head of the ink tank separated type is stored without causing any trouble in the printing function. [Structure] An ink tank separation type inkjet recording head 100 having a plurality of ejection ports 9 is filled with a non-hygroscopic, colorless and transparent storage liquid L, stored in a container body 25, and sealed with a lid 24 for storage.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for storing an ink jet recording head of an ink tank separation type which is detachably attached to an ink jet recording apparatus and ejects ink droplets onto a recording medium for recording.

[0002]

2. Description of the Related Art In various devices such as printers, facsimiles and copying machines, ink jet recording devices are being widely used as means for recording on recording media.

An ink jet recording apparatus has a structure in which ink is ejected from an ink jet recording head facing a recording medium by utilizing heat energy for recording, and the ink ejected onto a sheet as a recording medium is contained in an ink cartridge. It is detachable from the inkjet recording device. Further, the ink jet recording head is classified into a type that can be attached to and detached from a recording device integrally with an ink cartridge, and a tank separation type ink jet recording head that can be attached to and detached from the recording device separately from the ink cartridge.

The ink jet recording head before being used by being attached to the recording apparatus or the ink jet recording head detached from the apparatus is stored in a dedicated storage box and conveyed in order to prevent contamination and maintain a normal discharge function. store.

Conventionally, the ink-jet cartridge (IJC) in which the recording head and the ink tank are integrated has a form as shown in FIGS. 14 and 15, for example. That is, in order to prevent ink leakage and sticking from the ejection port 9, the ejection port 9 is closed by the seal member 22, and the pressing member 2
1, the air communication port 23 is closed by the seal member 22 in order to prevent ink leakage and ink evaporation from the air communication port 23, and the air communication port 23 is placed in the storage container 25 as shown in FIG. It was sealed with a sheet to protect and prevent ink evaporation.

Further, in order to accommodate the ink jet recording head of the ink tank separation type, as shown in FIG. 16, the ejection port surface portion where a plurality of ejection ports 9 are lined up is closed by the seal member 22 and the ink supply port 220 is provided. The side was closed with a cap member 30 to prevent evaporation and sticking of ink, and the container was put in a storage container as shown in FIG.

Further, as in the example shown in FIG. 9, for example, a container body 25 having a recess for accommodating an ink jet recording head having a plurality of ink discharge ports has a wall portion 53 which is maintained in a non-contact state with the ink jet recording head. And the wall 5
3 for projecting into the storage space to support the ink jet recording head, the ink jet recording head contains recording ink, and the wall portion 53 generates a capillary force against the ink. By integrally providing the suction portion 52 capable of suction-holding by the capillary force, it is possible to provide an inexpensive ink jet recording head container suitable for a package of the ink jet recording head.
In this configuration, the ink supply port side is not closed by the cap member and is left open, and when ink is scattered, it is held by the suction portion 52.

[0008]

Generally, in an ink jet recording head detachable by the user, even if the head and the ink cartridge are integrated, or the head and the ink cartridge are separate, the ink is stored in the accommodated state. It is necessary to use the sealing member as described above to prevent the sticking and evaporation of the.

Further, even when the ink cartridge separate type recording head is accommodated, it is necessary to prevent contamination and oxidation caused by the contact of the nozzles, pressure conversion elements, flow paths, filters and the like with the atmosphere. . In general, a silicon-based sealing material is often used as a sealing member for the nozzle and the flow path, but since the volatile component prevents contamination and the nozzle and the flow path are hydrophilic, the user can It is necessary to put ink in the head in order to stabilize the print quality when the printer starts to be used.

In the example shown in FIG. 15, both the ejection port 9 and the ink supply port 220 are elastic so as to prevent ink bleeding from the ejection port 9, sticking of the ink, and ink leakage from the ink supply port 220. By using the seal member 22 and the cap member that are held in a tightly closed state by members or the like, it is possible to reliably prevent the ink from bleeding out, but there is a problem that the number of parts increases and the cost increases.

Further, when the recording apparatus is mounted on the recording apparatus main body, there is a concern that the sealing member and the cap member have to be removed, and troubles such that the recording member is forgotten to be mounted on the recording apparatus main body.

Further, in the example shown in FIG. 9, a method for solving the above problem is shown. However, when the recording head is accommodated in a state where ink is contained, the surface of the ejection port 9 is sealed with a sealing member. It is difficult to completely seal the periphery of multiple minute discharge ports by closing only with the adhesive force of the ink. Ink or the like sticks to the gap between the seal member and the discharge port. In some cases, printing defects such as the above may occur. Further, in order to prevent this, when the adhesive force of the seal member was increased, the adhesive was clogged in the nozzle, which had the same adverse effect.

Further, since the filter portion is in contact with the atmosphere, the ink or the like may be fixed, and the ink may not be normally supplied when printing.

Even if the ink or the like is devised, the ink may leak from the supply port that cannot be received by the suction portion 52 of the storage container due to dropping, vibration, or the like.

The present invention has been made in order to solve the above-mentioned conventional problems, and a user can take out from a storage container and attach it to an ink jet recording apparatus main body without soiling his / her hands to perform normal printing. It is an object of the present invention to provide a method of storing an ink jet recording head of an ink tank separation type capable of performing the above.

[0016]

Therefore, a method of storing an ink jet recording head according to the present invention is provided with a plurality of nozzles for ejecting ink droplets from ejection ports, an ink flow path for supplying ink to the nozzles, and the ink. A method of storing an ink tank separation type ink jet recording head that has a flow path filter and discharges ink by the energy generated by a pressure conversion element provided in the nozzle, and is a non-hygroscopic colorless ink in the ink jet recording head. The object of the present invention is to be achieved by a configuration characterized in that it is filled with a transparent preservative and stored in a closed container.

[0017]

With the above construction, the non-hygroscopic, colorless and transparent storage liquid filled in the ink jet recording head of the ink tank separation type can contaminate the head or solidify and close the inside of the discharge port or the flow path. In addition, the inkjet recording head stored in the closed container can be maintained in the normal discharge function without being oxidized or corroded, and can be taken out from the storage container and mounted in the inkjet recording device to perform normal printing.

[0018]

EXAMPLES Hereinafter, a method for storing an ink jet recording head according to the present invention will be described by way of examples.

FIG. 3 and FIG. 4 are cross-sectional views of an essential part showing an example of an ink jet chip which constitutes an ink jet recording head of a tank separation type which is stored in one embodiment.

The ink jet chip (IJC) includes a substrate 1 (hereinafter referred to as a heater board) provided with an ink ejection pressure generating element, a liquid chamber 7 bonded to the substrate 1 and containing a recording liquid (hereinafter referred to as ink), and It is composed of the substrate 2 having an uneven portion forming the ink path 8. The substrate 2 also integrally has an orifice plate 4 (hereinafter referred to as a grooved top plate) having an ink ejection port 9 for ejecting ink communicating with the ink passage 8.

The heater board 1 is adhered and fixed to the support substrate 3 with an adhesive, and the grooved top plate 2 is provided on the heater board 1 and a heater portion as an ink ejection pressure generating element arranged on the heater board 1. The orifice plate 4 which is temporarily adhered so that the ink paths 8 of the grooved top plate 2 coincide with each other, and the orifice plate 4 which the grooved top plate has is arranged like a front sag on the front end face of the support substrate 3.

Ink is supplied from the ink supply member 5 through the ink supply port 2a provided in the upper portion of the grooved top plate, and the ink supply member 5 has a protruding rod and is penetrated on the supporting substrate. It is fixed to the supporting substrate by inserting a protruding rod into the hole and caulking with heat.

Ink supply member 5, heater board 1,
The gaps 10a and 10b with the grooved top plate 2 and the like, and the bonding area provided with a slight gap between the orifice plate and the front end face of the support substrate are used as the adhesive space. Is flooded.

In the present embodiment, as shown in FIG. 3, the groove 3A may be any groove that can sufficiently encapsulate the sealing material. A heater board is fixed on the support substrate 3 with an adhesive, and the grooved top plate 2 is arranged so that the heater portion arranged on the heater board 1 and the ink path 8 of the grooved top plate 2 are aligned with each other. After being temporarily fixed on the heater board 1 with an adhesive, it is fixed by a mechanical urging force of the pressing spring 6. The grooved top plate 2 has an orifice plate 4, and the orifice plate 4 is arranged on the front end surface of the support substrate 3 like a front sled. The ink supply member 5 is formed by aligning a protrusion bar (not shown) provided on the ink supply member with a through hole provided on the support substrate 3 and caulking them by heat.
It is fixed to the support substrate 3. At this time, uniform gaps 10a and 10b are formed between the orifice plate 4 and the ink supply member 5.

It is important that the groove 3A provided in the support substrate 3 forms a continuous space in the gap between the orifice plate 4 and the ink supply member 5. The groove 3A is completely covered with the orifice plate 4, or the gap 10
Independence from a and 10b is not preferred. Because the liquid path of the injected sealant is cut off,
This is because good sealing cannot be achieved.

The groove 3A formed on the front end surface of the support substrate 3 is formed by a press in consideration of mass productivity.

The encapsulant is injected from an encapsulant injection port (not shown) in the upper part of the ink supply member 5 to seal the wire bonding portion 11 for transmitting an electric signal and at the same time the orifice plate 4 and the ink supply member 5 are sealed. The grooves 3 provided in the supporting substrate 3 for sealing the gaps 10a and 10b between
After passing through A, the gap area between the orifice plate 4 and the front end surface of the support substrate 3 is completely sealed. Thus, in order for the sealing material to seal the gap without blocking the orifice 9, a proper thixotropy and a proper viscosity are required. That is,
If the viscosity of the sealing material is too low, it will enter even the nozzles and orifices in the grooved top plate 2 and cause clogging. On the other hand, if the viscosity is too high, the sealing material will not completely wrap around the orifice plate 4. Viscosity of sealing material is 1.0
00-15.000 cps, more preferably 2.00
0 to 10.000 cps, most preferably 4.000 to
It is 10.000 cps.

Further, the sealing material has good adhesion to the heater board 1 made of a silicon wafer, the support substrate 3 made of a metal, the grooved top plate 2 made of a synthetic resin, the orifice plate 4, the ink supply member 5, and the like. Sex is required. Further, in order to bond a plurality of different materials having different thermal expansion coefficients, a soft material capable of absorbing the difference in thermal expansion depending on the temperature environment, specifically, JIS standard A.
It is necessary to use a sealing material having a hardness of 100 or less.

On the other hand, this encapsulating material also has a function of covering and protecting the wire bonding portion 11, so that it must be a material which does not cause corrosion to the aluminum wire bonding portion and the aluminum electrode. In order to prevent corrosion of the electrodes and wire bonding, the concentration of impurity ions such as Cl ⁻ and Na ⁺ in the sealing material is preferably 30 ppm or less.

Such a material is also required to have such properties that it is excellent in ink resistance, particularly solvent resistance and alkali resistance in order to locally contact the ink. Moreover,
It must also have low permeability to oxygen, nitrogen and water vapor.

FIG. 5 shows the ink jet head unit I.
It is a JHU structure explanatory drawing. The inkjet head unit IJHU is a unit that performs recording by using an electrothermal converter that generates thermal energy for causing film boiling in ink according to an electric signal.

A heater board 1 is composed of electrothermal converters (discharge heaters) arranged in a plurality of rows on an Sl substrate and electric wiring such as Al for supplying electric power to the electrothermal converters by a film forming technique. Is. Reference numeral 200 denotes a wiring board for the heater board 1, and wiring for the wiring of the heater board 1 (for example, connected by wire bonding),
It has a pad 201 located at the end of this wiring and receiving an electric signal from the main body device.

Reference numeral 2 denotes a grooved top plate provided with partition walls for dividing a plurality of ink liquid passages and a common liquid chamber for accommodating ink to each ink passage, and the ink tank IT. An ink receiving port 2a for receiving the ink supplied from the above and introducing it into the common liquid chamber and an orifice plate 4 having a plurality of ejection ports corresponding to the respective ink flow paths are integrally molded. Polysulfone is preferable as the integral molding material, but other molding resin materials may be used.

Reference numeral 3 is a support member made of, for example, a metal, which supports the back surface of the wiring board 200 on a flat surface. 6 is a presser spring,
The common liquid chamber is pressed by a light pressure at the center of the M shape, and a part of the liquid passage, preferably a region near the discharge port, is pressed by the linear pressure in a concentrated manner by the linear pressure. By pressing the heater board 1 and the top plate 2 with the legs of the spring engaging the rear surface side of the support body 3 through the holes 3121 of the support body 3, the two are engaged with each other in a sandwiched state. Spring 6
Then, the heater board 1 and the top plate 2 are pressure-bonded and fixed by the concentrated urging force of the front slant portion 601.

The wiring board 200 is attached to the support 3 by adhering it with an adhesive or the like. The recesses 2400 and 2400 of the support body 3 are respectively provided with the positioning projections 25.
00, 2500, the ink supply member 5 forms an ink conduit 1600 that is continuous with the ink supply pipe 220 described above as a cantilever with the supply pipe 220 side being fixed, and A sealing ball 602 is inserted to ensure a capillary phenomenon with the supply tube 220. Reference numeral 70 is a filter provided at the end of the supply pipe on the tank side.

Since the ink supply member 5 is molded, the ink supply member 5 is inexpensive, has a high positional accuracy, and is free from a decrease in accuracy in forming and manufacturing, and also has a cantilevered conduit 16.
By 00, the pressure contact state of the conduit 1600 to the ink receiving port 2a can be stabilized even in mass production. In this example, by simply pouring the sealing adhesive from the ink supply member side under this pressure contact state, a more complete communication state can be surely obtained. Note that the ink supply member 5 is fixed to the support 3 by fixing holes 1901 and 1902 in the support 3.
It is easily performed by causing a pin (not shown) on the back surface side of the ink supply member 5 to protrude through the holes 1901 and 1902 of the support body 3 and heat-sealing the part protruding to the back surface side of the support body 3. .

6 and 7 are exploded explanatory views of the ink jet recording head to be stored.

It is possible to easily deal with colors by arranging a plurality of the ink jet chips in parallel and supplying inks of different colors to the respective ink jet chips. Further, high-speed recording is possible by supplying the same ink to a plurality of inkjet chips. In both cases, it is necessary that the respective ink jet chips are arranged with high accuracy.

In FIG. 6, reference numeral 40 denotes a unit material for arranging and maintaining a plurality of ink jet chips with high precision, and an ink jet chip holding portion surrounded by an outer wall of 4001 and an inner wall of 4002 or an inner wall of 4002. A unit frame 40 for arranging an inkjet chip on 4003 and an inkjet chip are positioned by a method of abutting the reference of each inkjet chip and a receiving portion of the unit frame 40 that receives the standard and adhering or fixing with a fixing member, in this case, each inkjet. It is necessary for the chip to be processed with high accuracy from the reference to the orifice, and for the receiving portion of the unit frame 40 to be highly accurate for the relative distance of each inkjet chip.

As another method, there is a method of arranging the inkjet chips by a technique such as image processing without abutting against the unit frame and fixing them by adhesion or the like to obtain positional accuracy between the inkjet chips.

Reference numeral 4005 denotes a porous member. When the head device is used for color, when the face is recovered and wiped with a wiper, ink adhering to the wiper is absorbed to cause a different color on the face of the adjacent ink jet chip. The ink is not attached, and is disposed between the inkjet chips.

In FIG. 7, reference numeral 4100 indicates a state of a plurality of ink jet chips arranged in the unit frame.

Reference numeral 4500 denotes a relay connector, and a plurality of contact members 4501 for supplying an electric signal to each inkjet chip are provided for each inkjet chip.
They are arranged in rows, and a plurality of chips are arranged in parallel. These are positioned and held by the housing 4506.

Reference numeral 4502 denotes a connection portion, which is brought into contact with and electrically connected to a connection pad provided on the main body carriage.

Reference numeral 4503 denotes a positioning hole, which is fitted with a positioning pin on the carriage of the main body so that 4503
The position of the second connection part and the connection pad on the carriage are prevented from being displaced, and the contact reliability is ensured. The wiring from the contact member 4501 to the connection portion 4502 is the wiring portion 4507 held by the housing 4506.
Among them, those which are electrically grouped between the heads, such as GND, are grouped together to reduce the number of connections with the main body.

Reference numeral 4504 denotes a pin for positioning the unit frame 40 and receiving the force of the contact point member 4501.
It fits into the hole 4011 in the unit frame 40. 450
Reference numeral 5 is for engaging with the locking portion 4010 of the unit frame 40 to fix the relay connector to the unit frame.

Reference numeral 4006 denotes a cover, which is for covering and protecting internal precision parts when completed as a head device, and is an ink supply pipe 220 and a filter 70.
A hole 4009 for passing 0 is opened. A locking pawl 4008 is for fixing the cover 4006 to the locking portion 4007 of the unit frame 4000.

The storage method of this embodiment will be described below.

FIG. 8 is a perspective view showing an example of an ink jet recording head to be stored, and FIGS. 9 to 13 are explanatory views of a storage container.

In one embodiment, the ink jet recording head 100 (hereinafter referred to as IJH) shown in FIG. 8 is packaged by the container 25 and the lid member 24 shown in FIG.

The ejection port surface 26 of the IJH 100 simultaneously closes the ejection ports of a plurality of ink jet chips (four in the illustrated example) by the seal member 22. The ink supply unit 220 that supplies ink to each chip is exposed without using a seal member.

The head support portion 50 inside the container 25 supports the frame 40 of the IJH 100 to support the IJH in the container. 51 is a receiving surface for receiving the bottom part of the frame,
53 is a deflated wall surface. IJH1 by the above container
00 is supported by the support portion 50 in the left-right direction and by the receiving portion 51 and the lid member 24 in the up-down direction. Reference numeral 52 is an adsorption portion provided on the container wall, and is provided so as to be located in the vicinity of the ink supply portion 220 of the IJH 100.

FIG. 10 is a plan view of the container 25 seen from the opening side, and FIG. 11 is a view showing a cross section taken along the line AA of FIG.

As shown in the figure, the suction portion 52 is located one step lower than the IJH receiving surface 51, and the surrounding receiving surface 51 is located.
It is also surrounded by the support portion 50. This has the effect of preventing the preservative solution from moving inside the container should the preservative solution flow out to the adsorption section 52.

The suction portion 52 has a groove structure as shown in the figure, and the liquid is immovable by the capillary force. Therefore, the surrounding by the receiving surface 51 and the supporting portion 50 is not necessarily required.

In the drawing, the ink supply port 2 of the IJH100 is shown.
Although the adsorption portion 52 is provided only on one surface in the vicinity of 20, if the adsorption portion 52 is provided on a plurality of surfaces inside the container, the amount of storing the preservative solution increases.

FIG. 13 shows an example in which the suction portion 52 is formed in a thin boss shape.

Although not shown, the suction portion may be embossed.

The features of this embodiment will be described in detail with reference to the sectional view of FIG.

The IJH 100 is supported by the receiving portion 51, stored in the storage container 25, and sealed by the lid member 24.
The IJH 100 is composed of a plurality of inkjet chips 60 and a frame 40 in which the plurality of IJ chips 60 are incorporated. The IJ chip 60 includes a discharge port 9 for discharging ink, a supply port 220 for supplying ink, a filter 70, and a heat dissipation member (not shown). And electrical contacts etc.

The IJ chip 60 is filled with the storage solution L indicated by dots. The storage liquid L is filled with a volume that can be accommodated in the discharge port 9 to the filter 70 as shown in the drawing.

When the printing ink is used as the storage solution, the ink contains water, a solvent, a dye, and urea for preventing the dye from sticking. In addition to problems such as sticking as described above, the dye has a problem that it leaks or stains are conspicuous due to the exuded ink, or stains on the hand.

Further, when urea is contained, since urea has a hygroscopic property, a meniscus is formed on the filter in the container as shown in FIG. 1A, and the container is dropped and vibrated. When such a phenomenon occurs, the meniscus drops and cannot be completely received by the falling receiving portion 52.

Therefore, in this embodiment, the preservative solution does not contain dyes and components having hygroscopicity such as urea, and water,
It is characterized by being composed of a solvent or the like.

An example of the composition of the preservation solution of this example is composed of glycerin 7.5%, thiodiglycol 7.5% acetylenol 1% pure water 86%. It goes without saying that the storage solution is colorless and transparent because it contains no dye.

Further, in a storage form using this storage solution as shown in FIG. 1, high temperature, low temperature, high humidity, low humidity, low pressure, vibration,
By conducting tests such as dropping, it was confirmed that good printing could be performed without forming a meniscus on the filter and without ink leakage.

The composition and the compounding ratio of the preservative solution are not particularly limited to the above-mentioned examples, but when water or alcohol, acetone, or other fast evaporating liquids are used alone or as a mixture, they are evaporated during storage. It does not play a role as a preservative solution, or when it evaporates, dirt in the flow path and inside the nozzle concentrates in the last remaining solution due to the capillary force at the discharge port, filter, etc. and it solidifies like cement, It may block the outlet, which is not desirable.

Therefore, it is desirable to use a slow-evaporating solvent such as glycerin or a mixture of a slow-evaporating solvent and water, but use a preservative solution having a composition and mixing ratio close to that of the ink actually used for printing. This is most desirable because it is easy to attach the recording head to the recording device and replace the storage liquid with the ink.

Further, it is desirable to block the front face of the discharge port with a seal member as shown in FIG. 1 in order to protect the discharge port from scratches and adhesion of dust and prevent evaporation of the preservation liquid, but it is not always necessary. Absent.

Further, the sealing tape used for the sealing member needs to have adhesiveness in order to prevent the tape from peeling off from the head during storage. However, when the tape is peeled off, an adhesive remains on the ejection port or the ejection port surface. It needs to be something that is not.

(Other Embodiments) FIG. 2 is an explanatory diagram showing an example of another embodiment.

In this example, the seal member indicated by reference numeral 22 in FIG. 1 is not used, but since the storage liquid does not stick to the tip of the discharge port, there is no adverse effect when printing after storage.

The present embodiment has the advantages that the number of steps for peeling off the seal member can be saved, the material cost for the seal member and the labor for sticking the seal member can be saved, and the cost can be reduced.

[0074]

As described above, according to the present invention,
The non-hygroscopic colorless and transparent preservation liquid filled in the ink jet recording head of the ink tank separation type can contaminate the head, solidify and close the ejection port or the inside of the flow path, and oxidize and corrode the head. In addition, the ejection function of the inkjet recording head stored in a closed container is maintained normally, and the user can take out the container from the storage container and attach it to the inkjet recording device to perform normal printing stably. You can

[Brief description of drawings]

FIG. 1 is a sectional view for explaining a stored state of an embodiment.

FIG. 2 is a sectional view for explaining a stored state of another embodiment.

FIG. 3 is an explanatory diagram of an inkjet chip.

FIG. 4 is an explanatory diagram of an inkjet chip.

FIG. 5 is an explanatory diagram of an inkjet head unit.

FIG. 6 is an exploded view of the inkjet recording head to be stored.

FIG. 7 is an exploded view of an inkjet recording head to be stored.

FIG. 8 is a perspective view of an inkjet recording head to be stored.

FIG. 9 is a perspective view of the storage container of the embodiment.

FIG. 10 is a plan view of the storage container of the embodiment.

FIG. 11 is a cross-sectional view of the storage container of the embodiment.

FIG. 12 is a sectional view for explaining the stored state of the embodiment.

FIG. 13 is a perspective view of a storage container body of another embodiment.

FIG. 14 is an explanatory diagram of storage of a conventional inkjet cartridge.

FIG. 15 is an explanatory diagram of a conventional ink jet cartridge storage container.

FIG. 16 is an explanatory diagram of storage of a conventional inkjet recording head.

[Explanation of symbols]

 9 Discharge port 22 Sealing member 24 Storage container lid member 25 Storage container body 40 Frame 51 Receiving part 52 Adsorption part 60 Inkjet chip (IJC) 70 Filter 100 Inkjet recording head (IJH) 220 Ink supply port L Preservative liquid

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Toshio Kashino 3-30-2 Shimomaruko, Ota-ku, Tokyo Canon Inc. (72) Inventor Masami Ikeda 3-30-2 Shimomaruko, Ota-ku, Tokyo Canon Within the corporation

Claims (3)

[Claims] 1. A pressure conversion element provided in a nozzle, comprising: a plurality of nozzles for ejecting ink droplets from an ejection port; an ink flow path for supplying ink to the nozzle; and a filter for the ink flow path. A method for storing an ink jet recording head of an ink tank separation type that ejects ink by energy, characterized in that the ink jet recording head is filled with a non-hygroscopic colorless transparent storage liquid and stored in a closed container. How to store the recording head. 2. The method for storing an ink jet recording head according to claim 1, wherein the ejection port surface for ejecting the ink droplets is closed by a seal member. 3. The method for storing an ink jet recording head according to claim 1, wherein the storage liquid is composed of any one of glycerin, thiodiglycol, acetylenol and pure water.