JPH1110906A - Jetting liquid container - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a jetting liquid container in which a jetting liquid can be supplied stably. SOLUTION: The jetting liquid container 10 is internally divided by a barrier wall 38 having a conduction hole 40 in the bottom thereof into a chamber 34 for containing a negative pressure generating member 32 provided with an atmosphere introduction port 12 and a liquid supply port 14A for a recording means, and a liquid containing chamber 36 enclosed except the conduction hole 40. A press contact body 46 is disposed in the liquid supply port 14A opening through the bottom wall of the container 10. The press contact body 46 has an upper end face abutting against the negative pressure generating member 32 and the lower end face disposed on the outside of the container side bottom face of the bottom wall of the container 10.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a discharge liquid storage container, and more particularly to a discharge liquid storage container suitable as a tank for holding a liquid ink used in an ink jet recording apparatus or a processing liquid.

[0002]

2. Description of the Related Art In general, in a discharge liquid storage container used in an ink jet recording apparatus, a liquid supply port for supplying ink to an ink jet head and a volume of air corresponding to ink consumption are supplied to the discharge liquid. It has two openings with an air communication port for introduction into the storage container.

In such a discharge liquid storage container having two openings, first, it is possible to stably supply ink to the ink jet head without running out of ink at the time of recording, and various environmental conditions during non-recording. It is required to reliably prevent the leakage of the ink even in the case of the change of the ink, and to surely prevent the leakage of the ink at the time of opening when replacing the liquid container for discharging liquid.

[0004] In order to satisfy such demands, an ink tank in which an absorber is provided has a structure in which ink is satisfactorily led out. For example, the ink tank has a higher capillary force between the absorber and the supply port than the absorber. 2. Description of the Related Art An ejection liquid storage container A having a structure, for example, as shown in FIG. This is a single-chamber ink container A in which an air communication port C is opened in a top wall B of a container A, an ink supply port E is opened in a bottom wall D, and a continuous porous member F is stored therein. The entirety of G is disposed inside the container A so as to cover the ink supply port E.

The above-mentioned pressure contact member is constituted by a porous member or a fiber bundle member having a higher density than the porous member of the absorber (hereinafter, referred to as a pressure contact member), and is a recording means such as a liquid discharge recording head. Since the supply pipe for supplying the liquid to the supply pipe is in contact with the pressure pipe, the pressing member needs a certain length component in the insertion direction of the supply pipe in order to perform its function. In this case, as shown in FIG. 8, the porous member (absorber) is pushed.

On the other hand, as a configuration for further improving the liquid storage efficiency, JP-A-7-125232, US Pat. No. 5,509,140, and JP-A-7-687.
No. 78, for example, has proposed a liquid storage container for discharge. This type of container has a negative pressure generating member storage chamber having a negative pressure generating member therein, which has an air communication portion communicating with the atmosphere and a liquid supply port for supplying liquid to the recording means, A liquid storage chamber that communicates with the generating member storage chamber via a communication path at the bottom and that is substantially sealed except for the communication path, and extends upward from the communication path of the negative pressure generation member storage chamber; And a partition. Japanese Unexamined Patent Publication No. 7-125232 discloses an invention in which a negative pressure generating member is compressed by inserting an ink supply pipe from the side, and ink in a closed space is rationally consumed by gas-liquid exchange. It is disclosed as a technical invention.

An ink tank having the negative pressure generating member storage chamber and the liquid storage chamber described above,
In particular, as disclosed in Japanese Patent Application Laid-Open No. 7-68778, there is a printer in which a supply port is provided on a bottom surface so as to take out liquid downward while being attached to a recording apparatus.

[0008] As an example of the configuration of an ink container provided with a press-contact member, there is a configuration disclosed in, for example, Japanese Patent Application Laid-Open No. 5-104735.

[0009]

In this configuration, since the pressure contact member is partially disposed so as to protrude outward from the ink container, the amount of pushing into the negative pressure generating member (absorber) is the same as that described above. As described above, although the influence on the communicating portion by the pressing member pushing the negative pressure generating member is reduced as in the above-described example, the stable ejection liquid is not necessarily obtained, such as ink leakage or supply failure in some cases. It has been confirmed by the present inventors that the supply of no. May not be performed.

An object of the present invention is to provide a stable discharge liquid using a pressure contact member even when a liquid supply port of a container having the above-described negative pressure generating member storage chamber and the liquid storage chamber is provided at the bottom of the container. An object of the present invention is to provide a discharge liquid storage container that can supply a liquid.

In the present specification, the capillary force is a height h (cmAq) of a liquid level in a pipe formed in a capillary when the capillary is immersed in a liquid having a predetermined liquid level from the predetermined liquid level.
The negative pressure is used to mean the liquid pressure (-hcmAq) at a predetermined liquid level at this time. The term “ink” is used to include not only liquid inks used in ink jet recording apparatuses but also processing liquids used for these recordings.

[0012]

According to a first aspect of the present invention, there is provided a discharge liquid container according to the first aspect of the present invention, wherein the inside of the container is introduced with a partition having a communication hole at a bottom to introduce air. A first storage chamber provided with a liquid supply port for supplying a liquid to the recording means and a negative pressure generating member therein; and a first storage chamber for storing the liquid in a closed structure except for the communication hole. A discharge liquid storage container divided into two chambers, wherein a pressure contact body is disposed in the liquid supply port opened in a bottom wall of the container, and an upper end surface of the pressure contact body is the negative It is characterized in that the lower end surface is located outside the inner bottom surface of the container at the bottom wall of the container while being in contact with the pressure generating member.

According to a second aspect of the present invention, the distance between the partition wall side surface of the pressure contact body and the partition wall is 5 mm or more and 30 mm or less, and the thickness of the pressure contact body is 6 mm or more. 8 mm or less, the amount of pressure contact of the negative pressure generating member by the upper end surface of the pressure contact body is 0 mm or more and 5 mm or less from the inner bottom surface of the bottom wall of the container, and
The lower end surface of the pressure contact body is located 1.5 mm or more and 3.5 mm or less outside the outer surface of the bottom wall of the container.

According to a third aspect of the present invention, in the liquid container for discharging according to the present invention, a step is provided around the liquid supply port of the container so as to protrude inward from a bottom inner surface of a bottom wall of the container. It is characterized by being.

According to a fourth aspect of the present invention, in the discharge liquid storage container, the liquid supply port is defined in a liquid supply cylinder formed so as to protrude outward from a container outer surface of a bottom wall of the container. It is characterized by having.

According to a fifth aspect of the present invention, in the discharge liquid storage container, the partition wall is formed with a capillary force generating portion and an air introduction passage for introducing air from the first storage chamber to the second storage chamber. It is characterized by being.

According to a sixth aspect of the present invention, in the discharge liquid container, the pressure contact body is made of polypropylene felt.

According to a seventh aspect of the present invention, there is provided a discharge liquid storage container, wherein the discharge liquid storage container stores ink to be supplied to an ink jet head.

The discharge liquid storage container according to the present invention has an atmosphere communication portion communicating with the atmosphere and a liquid supply port for supplying a liquid to the recording means, and houses a negative pressure generating member therein. A negative pressure generating member storage chamber, a liquid storage chamber that communicates with the negative pressure generation member storage chamber via a communication path at the bottom, and is substantially sealed except for the communication path; What is claimed is: 1. A discharge liquid storage container including a storage chamber and a partition partitioning the liquid storage chamber, wherein the partition has a capillary force generation unit therein, and a liquid supply provided on a bottom surface of the negative pressure generation member storage chamber. A pressure contact body is disposed in the mouth, and an upper end surface of the pressure contact body is in contact with the negative pressure generating member, and a distance L1 between the communication path and a position closest to the communication path of the pressure contact body satisfies the following expression. It is characterized in that it is set as follows.

L1 <(Hs-Hpa-h) / Δh where h is the capillary converted from the pressure in the vicinity of the communication path by the product of the density ρ of the ejection liquid and the gravitational acceleration g, and converted to a dimension of length. When the force, that is, the pressure in the vicinity of the communication path is ΔPca, h = ΔPca / ρg, and Hs is the length obtained by dividing the capillary force of the negative pressure generating member by the product of the density ρ of the discharge liquid and the gravitational acceleration g. When the capillary force converted into the dimension of the negative pressure, that is, the capillary force of the negative pressure generating member is ΔPs, Hs = ΔPs /
ρg and Hpa are the positional head difference between the gas-liquid interface in the negative pressure generating member and the vicinity of the communication path, and Δh is the pressure loss in the negative pressure generating member between the communication path and the liquid supply port. When the pressure loss is ΔPe, ie, the pressure loss is ΔPe / ρg, Δh = ΔPe / ρg.

According to a ninth aspect of the present invention, in the discharge liquid container, the pressure contact body has a lower end surface located outside a bottom surface of the container inside the container.

According to a tenth aspect of the present invention, in the discharge liquid storage container, a step portion is provided around the liquid supply port of the container so as to protrude inward from a bottom surface inside the container on a bottom wall of the container. It is characterized by being.

In the liquid container for discharging according to the present invention, the liquid supply port is defined in a liquid supply cylinder formed so as to protrude outward from a container outer surface of a bottom wall of the container. It is characterized by having.

According to a twelfth aspect of the present invention, there is provided a discharge liquid storage container for storing ink to be supplied to an ink jet head.

According to a thirteenth aspect of the present invention, there is provided a discharge liquid container having an atmosphere communicating portion communicating with the atmosphere and a liquid supply port for supplying a liquid to the recording means, and containing a negative pressure generating member therein. A negative pressure generating member storage chamber, a liquid storage chamber that communicates with the negative pressure generation member storage chamber via a communication path at the bottom, and is substantially sealed except for the communication path; A discharge liquid storage container including a storage chamber and a partition partitioning the liquid storage chamber, wherein a capillary force generating unit is formed inside the partition and the negative pressure generating member storage chamber is connected to the liquid storage chamber. An air introduction path for introducing air is provided, and a pressure contact body is disposed in a liquid supply port provided on a bottom surface of the negative pressure generation member storage chamber, and an upper end surface of the pressure contact body is in contact with the negative pressure generation member. From the communication passage and the communication passage of the pressure contact body. Distance L1 to the near point also is characterized in that it is set to satisfy the following equation.

L1 <(Hs-Hp-h) / Δh where h is the capillary converted into the dimension of length by dividing the pressure near the communication path by the product of the density ρ of the ejection liquid and the gravitational acceleration g. When the force, that is, the pressure in the vicinity of the communication path is ΔPca, h = ΔPca / ρg, and Hs is the length obtained by dividing the capillary force of the negative pressure generating member by the product of the density ρ of the discharge liquid and the gravitational acceleration g. When the capillary force converted into the dimension of the negative pressure, that is, the capillary force of the negative pressure generating member is ΔPs, Hs = ΔPs /
ρg and Hp are positional head differences between the gas-liquid interface in the negative pressure generating member and the capillary force generating section, and Δh is a pressure loss in the negative pressure generating member between the communication passage and the liquid supply port. A loss head converted to the dimension of length divided by the product of the density ρ of the liquid and the gravitational acceleration g, that is, when the pressure loss is ΔPe, Δh = ΔPe / ρg.

According to a fourteenth aspect of the present invention, in the liquid container for discharging, the pressure contact body has a lower end surface located outside a bottom surface inside the container.

In a preferred embodiment of the present invention, a step portion is provided around the liquid supply port of the container so as to protrude inward from a bottom surface inside the container on a bottom wall of the container. It is characterized by being.

In the liquid storage container for discharging according to the present invention, the liquid supply port is defined in a liquid supply cylinder formed so as to protrude outward from a container outer surface of a bottom wall of the container. It is characterized by having.

[0030] According to a seventeenth aspect of the present invention, there is provided a discharge liquid storage container for storing ink to be supplied to an ink jet head.

The discharge liquid storage container according to the eighteenth aspect of the present invention has an atmosphere communication portion communicating with the atmosphere and a liquid supply port for supplying a liquid to the recording means, and houses a negative pressure generating member therein. A negative pressure generating member storage chamber, a liquid storage chamber that communicates with the negative pressure generation member storage chamber via a communication path at the bottom, and is substantially sealed except for the communication path; And a partition extending upward from the communication path of the storage chamber, wherein a pressure contact body is disposed in a liquid supply port provided on a bottom surface of the negative pressure generating member storage chamber. The upper end surface of the pressure contact body abuts against the negative pressure generating member, and the lower end surface is located outside the container inner bottom surface of the container, and is closest to the communication path of the pressure contact body from the communication path. Distance L1 to the location is 5m
The liquid supply port is arranged so as to satisfy m ≦ L1 ≦ 60 mm.

[0032] According to a nineteenth aspect of the present invention, the distance L1 satisfies 10 mm ≦ L1 ≦ 50 mm.

According to the present invention, the upper end surface of the press-contact body disposed in the liquid supply port opened in the bottom wall of the container comes into contact with the negative pressure generating member, and the lower end surface of the press-contact body is formed on the bottom wall of the container. Since it is located outside of the inner bottom surface, even if a predetermined thickness is given to the press-contact body, the upper end surface of the press-contact body lifts the negative pressure generating member from the container inner bottom surface less. The compression ratio of the abutting negative pressure generating member does not increase so much, and no large gap is formed between the negative pressure generating member and the bottom wall. Therefore, stable supply without running out of liquid is performed.

[0034]

Embodiments of the present invention will be described below with reference to the accompanying drawings. In all of the embodiments, the same portions are denoted by the same reference numerals, and redundant description will be avoided.

An outline of a preferred embodiment of the present invention will be described first with reference to FIGS.

First, the ejection liquid storage container 10 according to the present embodiment has a substantially rectangular parallelepiped shape.
At U, an atmosphere communication port 12 which is a hole communicating with the inside of the liquid storage container for ejection is provided.

The bottom wall 10 of the discharge liquid storage container 10
In B, an ink supply cylinder 14 that defines a liquid supply port in a form projecting in a cylindrical shape is formed. In the distribution process, the atmosphere communication port 12 is made of a film sheet or the like, and the ink supply cylinder 14 is closed and sealed by a cap as a liquid supply port sealing member.

Reference numeral 16 denotes a lever member which is integrally formed so as to be elastically deformable on the outside of the ejection liquid storage container 10, and has a locking projection formed at an intermediate portion thereof.

Reference numeral 20 denotes a head-integrated tank case in which the above-described ejection liquid storage container 10 is mounted. In the present embodiment, for example, the ejection liquid storage containers of cyan C, magenta M, and yellow Y are used. Container 10 (10C, 10M,
10Y) separately or integrally. A color inkjet head 22 is integrally provided below the tank case 20. Color inkjet head 22
Has a plurality of outlets formed downward (hereinafter, referred to as
The surface of the head on which the discharge ports are formed is referred to as a discharge port formation surface).

Then, the ejection liquid storage container 10 is provided as shown in FIG.
From the state shown in FIG.
0, the ink supply tube 14 closely engages with the ink supply tube receiving portion 24 of the tank case 20 via an elastic member, and the ink passage tube 2 of the color inkjet head 22
6 is pushed into the ink supply cylinder 14. Then, the locking projection 16A of the lever member 16 is engaged with a projection (not shown) formed at a predetermined position of the tank case 20 integrated with the head, and the proper mounting state shown in FIG. 1B is obtained. The head-integrated tank case 20 with the ejection liquid storage container 10 mounted thereon is further mounted on a carriage of an ink jet recording apparatus (not shown) to be in a printable state. In this state,
A predetermined head difference H is formed between the bottom of the ejection liquid storage container 10 and the ejection port forming surface of the recording head.

First, each parameter affecting the operation of the present invention will be described.

First, the distance from the communication path to the supply port will be described. To normally supply ink to the recording head, the balance of the negative pressure in the ink tank is an important factor. In the ink tank having the negative pressure generating member storage chamber and the liquid storage chamber, when gas-liquid exchange is performed and the ink supply operation is performed, the negative pressure balance in the ink tank is: | h | + | Δh × L1 When the relationship | <| Hs | − | Hpa | is satisfied, the ink supply operation is performed normally while maintaining the gas-liquid interface height in the absorber (negative pressure generating member).

Here, the ejection liquid storage container 10 has a configuration as shown in FIG. 3, and includes an atmosphere communication portion 12 communicating with the atmosphere and a liquid supply port 14A for supplying a liquid to the recording means. A negative pressure generating member storage chamber 34 in which a negative pressure generating member 32 is stored communicates with the negative pressure generating member storage chamber 34 via a communication path 40 at the bottom, and substantially except for the communication path 40. A liquid storage chamber 36 which is sealed;
The discharge liquid storage container 10 includes a partition wall 38 for partitioning the negative pressure generation member storage chamber 34 and the liquid storage chamber 36, wherein the partition wall 38 includes a capillary force generation unit therein, A pressure contact body 46 is disposed in the liquid supply port 14A provided on the bottom surface of the member storage chamber 34, and the upper end surface of the pressure contact body 46 is in contact with the negative pressure generating member 32. The distance L1 between the communication path 40 and the closest part of the pressure contact body 46 from the communication path is set so as to satisfy the following equation.

L1 <(Hs-Hpa-h) / Δh where h is a capillary converted into a dimension of length by dividing the pressure in the vicinity of the communication path by the product of the density ρ of the ejection liquid and the gravitational acceleration g. When the force, that is, the pressure in the vicinity of the communication path is ΔPca, h = ΔPca / ρg, and Hs is the length obtained by dividing the capillary force of the negative pressure generating member by the product of the density ρ of the discharge liquid and the gravitational acceleration g. When the capillary force converted into the dimension of the negative pressure, that is, the capillary force of the negative pressure generating member is ΔPs, Hs = ΔPs /
ρg and Hpa are the position head (water head) difference between the gas-liquid interface in the negative pressure generating member and the vicinity of the communication path, and Δh is the communication path 40
Negative pressure generating member 32 between the liquid supply port 14A and
Of the pressure drop in the liquid and the acceleration of gravity g
Loss product converted to the dimension of length divided by the product of the above, ie, when the pressure loss is ΔPe, Δh = ΔPe / ρg
It is. The pressure loss ΔPe is a value obtained by integrating the pressure loss of each cross section obtained from each cross sectional area of the flux of the discharge liquid flowing in the negative pressure generating member 32 by the length of the flux. That is, it is proportional to the length and velocity of the flux and inversely proportional to the area of the cross section perpendicular to the flux.

The cross-sectional area is determined by the product of the thickness of the negative pressure generating member 32 and the height of the gas-liquid interface LL in the negative pressure generating member 32 from the bottom surface of the negative pressure generating member storage chamber 34. Since the pressure loss is not uniform over the entire negative pressure generating member 32 and it is difficult to determine the pressure loss at all cross sections, the cross-sectional area is determined by the average height of the gas-liquid interface LL within the negative pressure generating member 32 and the negative pressure. The product is the product of the average widths of the pressure generating members 32. Since the maximum length is a problem for the length of the flux, the distance between the communication path and the closest point from the communication path of the press-contact body is set. Assuming that the pressure loss per unit length is ΔP, the pressure loss ΔPe is represented by ΔPe = ΔP × L1, and the average length of the flux is determined from the communication path 40 to the pressure contact body 46 and the negative pressure generation. It is the distance to the center of the gas-liquid interface LL of the member 32.

However, ΔPca> H, and if this relationship is not satisfied, an appropriate negative pressure cannot be generated for the recording head 22.

FIG. 3 shows an example in which nothing other than the communication path is formed in the partition wall 38 that divides the ink tank into two parts. In this example, the negative pressure ΔP generated when performing gas-liquid exchange near the communication passage is described.
ca.

On the other hand, as one of more preferred examples, a case where a capillary force generating groove is actively provided in the partition wall 38 will be described.

The discharge liquid storage container 10 has a configuration as shown in FIG. 4, and is provided with a capillary force generating groove 60 and an air introduction passage 50 near the communication passage 40 of the partition wall 38. In this configuration, the distance L1 from the communication path 40 to the closest point of the pressure contact body 46 from the communication path 40 is L1 <(Hs−Hpa−h) / Δh where h is the pressure near the communication path. When the capillary force converted to the dimension of the length divided by the product of the density ρ of the ejection liquid and the gravitational acceleration g, that is, the pressure near the communication path is ΔPc, h = ΔPc / ρg, and Hs is the negative value. When the capillary force of the pressure generating member is divided by the product of the density ρ of the liquid for ejection and the gravitational acceleration g, and converted into a dimension of length, that is, the capillary force of the negative pressure generating member is ΔPs, Hs = ΔPs / ρ
g and Hpa are positional head differences between the gas-liquid interface in the negative pressure generating member and the vicinity of the communication path, and Δh is a pressure head for discharging the pressure loss in the negative pressure generating member between the communication path and the liquid supply port 14A. The loss head converted to the dimension of length divided by the product of the density ρ of the liquid and the gravitational acceleration g, that is, the pressure loss is ΔP
When e is set, Δh = ΔPe / ρg. The pressure loss ΔPe is a value obtained by integrating the pressure loss of each cross section obtained from each cross sectional area of the flux of the discharge liquid flowing in the negative pressure generating member by the length of the flux. That is, it is proportional to the length and velocity of the flux and inversely proportional to the area of the cross section perpendicular to the flux.

The cross-sectional area is determined by the product of the thickness of the negative pressure generating member and the height of the gas-liquid interface in the negative pressure generating member from the bottom surface of the negative pressure generating member storage chamber 34. Since the pressure loss is not uniform over the entire cross section of the generating member and it is difficult to determine the pressure loss at all cross sections, the cross-sectional area is determined by the average height of the gas-liquid interface in the negative pressure generating member and the average width of the negative pressure generating member. The product of Since the maximum length is a problem for the length of the flux, the distance between the communication path and the closest point from the communication path of the press-contact body is set. Assuming that the pressure loss per unit length is ΔP, the pressure loss ΔPe is represented by ΔPe = ΔP × L1, and the average length of the flux is calculated from the communication path to the pressure contact body and the negative pressure generating member. It is the distance to the center of the gas-liquid interface.

However, ΔPc> H (H is a position head (water head) difference between the communication path and the ejection port forming surface of the liquid ejection head of the recording means). No negative pressure can be created.

Here, the case of an ink tank using a pressure contact body made of a sponge constituted by thermally compressing four times will be examined. The used ink has a surface tension γ = 30 dyne / c.
m, viscosity η = 2 cp, density ρ = 1.06 g / cm ³ , ink flow rate 1.44 g / min, negative pressure at the discharge port (orifice) of the recording head immediately after opening is set to 25 mmAq, and initial ink at opening is set.・ Air interface height is 40 mm, negative pressure at the orifice when gas-liquid exchange is performed is 15 mmAq, ink at gas-liquid exchange is 12 m
m, pressure loss ΔPs = 90 mmAq, ΔP
c = 40 mmAq, ΔPe = 0.5 mmAq / mm and L
Since 1 <(90-12-40) /0.5=76 mm, L1 was set to 75 mm, and an experiment was performed. As a result, stable use was possible in a normal use state.

However, since the ink tank is supplied to the consumer through various distribution channels, it is preferable to consider a safety factor against an external impact or the like. In addition, since the consumer may drop the ink tank during use, it is preferable that the upper limit of L1 be about 60 mm in consideration of the safety factor under these conditions. More safely, it is about 50 mm.

On the other hand, as for the lower limit of L1, it is important to consider the movement of the negative pressure generating member 32 due to the pressing of the pressure contact body. For example, in an ink tank provided with a supply port 14A provided with a pressure contact body 46 at a position about 5 mm away from the communication path 40, the pressure contact body 46 is pushed in by 3 mm.
The negative pressure generating member 32 in the vicinity of the communication path moves locally upward in a direction away from the communication path 40 by about 1 mm. By the way, the negative pressure generating member 32 housed in the ink tank has about 2.
Approximately 5 mm is housed by being pressed downward on the communication portion side. As a result, even if the negative pressure generating member 32 is locally moved as described above, the ink supply operation can be sufficiently performed.

However, in consideration of a variation factor at the time of inserting the housed negative pressure generating member 32, a deviation due to an external factor, and the like, it is safe to set L1 to about 10 mm.

From the above description, as a specific example of the range of the position of the press contact body 46, L1 is 5 mm or more and 60 mm or less, and more preferably, L1 is 10 mm or more and 50 mm or less.

Next, a specific embodiment of the ejection liquid storage container 10 will be described with reference to FIG.

The discharge liquid storage container 10 of the present embodiment.
Communicates with the atmosphere communication port 12 at the upper part and the liquid supply port 1 at the lower part.
4A, a first storage chamber 34 that houses therein a continuous porous elastic member 32 as a negative pressure generating member, and a second storage chamber 36 as a sealed liquid storage chamber that directly stores liquid ink. Are partitioned by partition walls 38. The first storage chamber 34 and the second storage chamber 36 are communicated only via a communication port 40 formed in a partition wall 38 at the bottom of the discharge liquid storage container 10.

A plurality of ribs 42 are integrally formed on the upper wall 10U of the discharge liquid storage container 10 defining the first storage chamber 34 so as to protrude inside. And is in contact with the continuous porous elastic member 32 accommodated in. Thus, an air buffer chamber 44 is formed between the upper wall 10U and the upper surface of the continuous porous elastic member 32. The continuous porous elastic member 32 is formed of, for example, a heat-compressed urethane foam, and is housed in the first housing chamber 34 in a compressed state so as to generate a predetermined capillary force as described later. The absolute value of the pore size of the continuous porous elastic member 32 for generating the predetermined capillary force depends on the type of ink to be used, the size of the ejection liquid storage container 10, and the position of the ejection port forming surface of the inkjet head 22 (water head). Although it depends on the difference H) and the like, it is necessary to be able to generate a capillary force larger than a capillary force in a capillary force generation groove or passage described later.

In the ink supply cylinder 14 defining the liquid supply port 14A, a disk-shaped or column-shaped pressure contact body 46 is disposed. The press contact body 46 is formed of, for example, a felt of polypropylene, and is not easily deformed by an external force. The pressing body 46 is
In the state shown in FIG. 5 which is not mounted on the tank case 20 described above, the continuous porous elastic member 32 is held in a pressed state in which the continuous porous elastic member 32 is slightly pressed into the continuous porous elastic member 32 so as to be locally compressed. The amount of pressing of the continuous porous elastic member 32 by the upper end surface of the pressing member 46 depends on the bottom wall 10 of the container 10.
It is preferably 0 mm or more and 5 mm or less from the inner bottom surface of the container B. For this purpose, a flange 14 </ b> B is formed at the end of the ink supply cylinder 14 so as to abut on the periphery of the pressure contact body 46. The press-contact body 46 is formed of the continuous porous elastic member 3.
2 to receive a repulsive force of about 300 gf, and in order to prevent itself from bending and dropping from a predetermined position in the ink supply cylinder 14, the aspect ratio of the thickness (height) to the width in the cross section shown in FIG. Preferably, the ratio is set to 0.5 or more.

In the embodiment shown in FIG. 5, the inner dimension L0-1 in the longitudinal direction of the container 10 is about 70 mm, and the inner dimension h in the height direction is h.
0-1 is about 50 mm, the inner length L0-2 of the first storage chamber 34 in the longitudinal direction is about 43 to 47 mm, and the side of the partition 38 from the side of the continuous porous elastic member 32 to the side of the pressure contact body 46 on the side of the partition 38. Is about 22 to 26 mm. The basic thickness of the entire container 10 is about 2 mm. An annular step 14C is provided around the liquid supply port 14A of the container 10 so as to protrude inward from the inner bottom surface of the bottom wall 10B of the container 10 and has a height h2-3 of 0.3.
0.4 mm, and the width L3 is 1.5-3 mm.

Further, when the container 10 is mounted on the head-integrated tank case 20,
That is, when the ink passage tube 26 of the above-described color inkjet head 22 enters the ink supply tube 14 (the state shown in FIG. 6), and when it is removed and does not enter the state (the state shown in FIG. 5). The difference between h1-1 in FIG. 5 and FIG.
Is preferably about 1 mm.
This is to prevent ink dripping when the ejection liquid storage container 10 is removed while ensuring a good flow of ink.

That is, in the ejection liquid storage container 10 of the present embodiment, ink flows into and out of the continuous porous elastic member 32 due to a temperature change and a pressure change during use. At this time, in order to reliably maintain the ink holding force (negative pressure) at the liquid supply port 14A, even if the ink passage tube 26 is detached from the ink supply tube 14,
The meniscus force of the continuous porous elastic member 32 in the vicinity of 4A must be maintained, and for this purpose, a pressure contact body 46, which is a hard absorbing member, is provided.

Next, the embodiment shown in FIG.
4A is an example in which the position is changed in accordance with the tank case 20 to be used and provided near the partition wall 38. This is for the following reason. That is, since the press contact body 46 is pressed against the continuous porous elastic member 32, the portion of the continuous porous elastic member 32 that contacts the press contact body 46 is locally deformed. Therefore, if the liquid supply port 14A is too close to the communication port 40 which is a gas-liquid exchange port, the influence of distortion due to the deformation of the continuous porous elastic member 32 affects the gas-liquid exchange port. Variation increases. In the worst case, an appropriate negative pressure cannot be generated, and ink dripping may occur from the liquid supply port 14A. Conversely, the liquid supply port 14A
Is too far from the communication port 40, which is a gas-liquid exchange port,
During the gas-liquid exchange operation described later, the liquid supply port 1
When the flow resistance up to 4A increases and the ink consumption speed is high, the ink runs out. Therefore, the distance from the communication port 40 to the liquid supply port 14A is preferably within a predetermined range. In the example shown in FIG. 5, the distance L1 is about 22 to 26 m.
m, that is, about 30 mm or less, and in the example of FIG. 7, the distance L1-3 is about 5 mm.

Next, a structure for controlling the negative pressure generated by the continuous porous elastic member 32 as the negative pressure generating member will be described.

In the present embodiment, as shown in FIG. 5, the first upper end of the first housing chamber 34 below the partition wall 38 contacts the continuous porous elastic member 32 as a negative pressure generating member and opens. An air introduction groove 50 as one passage;
And two capillary force generation grooves 60 as second passages whose lower ends communicate with the communication port 40 are formed in parallel with each other (only one cross section of one air introduction groove and one capillary force generation groove is shown in the figure). Not represented). Further, as shown in the drawing, the lower end of the capillary force generating groove 60 may be continuous with the groove 65 formed in the longitudinal direction above the communication port 40. In this way, even if the continuous porous elastic member 32 bites into the groove at the lower end of the capillary force generating groove 60, the passage is reliably secured. In addition, it is preferable to provide the air introduction groove 50 having a width larger than the capillary force generation groove 60 to ensure the reliability of the air introduction and reduce the resistance at the start of gas-liquid exchange. As described later, the capillary force generating groove 60 can be regarded as a capillary tube that generates a capillary force by the groove surface in the partition wall 38 and one surface on the continuous porous elastic member 32 side.

The cross-sectional shape of the above-mentioned capillary force generating groove can take various forms, for example, a trapezoidal cross section, a rectangular cross section, or a semicircular cross section.

In the above-described embodiment, the first and second passages are each formed by a groove, but may be formed by the passage itself instead of the groove. That is, below the partition wall 38, the upper end is in contact with the continuous porous elastic member 32 as the negative pressure generating member, and the upper end is opened to communicate with the air introduction passage, and the lower end is connected to the communication port 40. May be formed as a second passage that communicates with the capillary force generation passage. With this configuration, the capillary force generation passage does not need to adopt a structure in which a part of the groove is closed by the continuous porous elastic member 32, so that the capillary force generation can be set without being affected by the continuous porous elastic member 32. can do.

Here, the principle of operation of the ejection liquid storage container according to the present embodiment will be described.

As shown in FIG. 6, when the ink jet recording apparatus is operated in a so-called mounted state in which the ink passage cylinder 26 is pushed into the ink supply cylinder 14, ink is ejected from the ink jet head 22 and ejected. The ink suction force is generated in the liquid storage container 10.

When a sufficient amount of ink is impregnated in the continuous porous elastic member 32 as the negative pressure generating member in the negative pressure generating member storage chamber 34, the ink in the negative pressure generating member is consumed, The upper surface of the ink (referred to as a gas-liquid interface) decreases. The magnitude of the generated negative pressure at this time is determined by the capillary force at the gas-liquid interface of the negative pressure generating member and the head pressure.

As the consumption further progresses, the gas-liquid interface reaches the upper end of the air introduction groove 50, and the pressure at the bottom of the negative pressure generating member 32 and the liquid storage chamber 36 for directly storing the liquid ink is changed to the capillary force generation groove. At the time when the pressure is lower than the capillary force generated in the inside 60, the atmosphere is supplied to the liquid storage chamber 36 through the air introduction groove 50 and the capillary force generation groove 60. As a result, the pressure in the liquid storage chamber 36 increases by the amount introduced into the atmosphere, and communicates from the liquid storage chamber 36 into the negative pressure generating member 32 in order to eliminate the difference between the increased pressure and the pressure of the negative pressure generating member 32. Ink is supplied through the port 40. That is, gas-liquid exchange is performed.

At this point, the pressure at the tank bottom rises by the amount of ink supply, and the supply of air to the liquid storage chamber 36 is stopped.

During the ink consumption, the above-described gas-liquid exchange is performed continuously, so that the ink in the liquid storage chamber 36 is supplied to the negative pressure generating member 32. Therefore, the negative pressure generated during consumption of the ink in the liquid storage chamber 36 is determined by the capillary force generated in the capillary force generation groove 60. Therefore, it is understood that the negative pressure generated at the time of gas-liquid exchange can be determined by selecting the size of the capillary force generation groove 60.

Further, the principle of operation of the ejection liquid storage container 10 according to the present invention will be described in detail.

The negative pressure generating member (continuous porous elastic member) 32 stored in the negative pressure generating member storage chamber 34 can be regarded as having a large number of capillaries, and the negative pressure is generated by the meniscus force. generate. Normally, the discharge liquid storage container 10 has a negative pressure generating member 32 immediately after its use.
Since sufficient ink is impregnated therein, the head height of each assumed capillary is located sufficiently high. When the ink is consumed through the liquid supply port 14A, the pressure at the bottom of the negative pressure generating member storage chamber 34 decreases, and the head of each assumed capillary also decreases. That is, as the ink is consumed, the gas-liquid interface of the negative pressure generating member 32 decreases. Note that the heights of the respective water heads at this time are not all equal, and the liquid supply port 1 is not closed due to the pressure loss existing in the negative pressure generating member 32.
The head of the deemed capillary near 4A is lower.

At this time, the ejection liquid storage container 10
The negative pressure generated therein is determined by the capillary force of the negative pressure generating member 32, and the pressure at the discharge port forming surface of the inkjet head 22 is determined by the head difference between the gas-liquid interface and the discharge port forming surface.

When the ink is further consumed, the gas-liquid interface lowers, the upper end of the air introduction groove 50 is positioned above the gas-liquid interface, and the air enters the air introduction groove 50. At this time, compared to the capillary force of the capillary without the continuous porous elastic member 32,
Since the capillary force generated in the capillary force generation groove 60 is set to be weak, the meniscus in the capillary force generation groove 60 is broken by further consumption of the ink, and the gas-liquid interface is not reduced, and the atmosphere is reduced. Capillary force generating groove 60 and communication port 4
0 and is introduced into the liquid storage chamber 36.

When the atmosphere is introduced into the liquid storage chamber 36, the pressure in the liquid storage chamber 36 is accordingly reduced to the negative pressure generating member storage chamber 34.
The ink is supplied from the liquid storage chamber 36 to the negative pressure generating member storage chamber 34 to the extent that the pressure becomes higher than the pressure at the bottom and the pressure difference is eliminated. Then, the pressure becomes higher than the capillary force of the capillary force generating groove 60, and the ink flows into the capillary force generating groove 60, so that the further introduction of the atmosphere into the liquid storage chamber 36 is stopped.

When the ink is further consumed, the meniscus in the capillary force generating groove 60 is broken again without lowering the gas-liquid interface as described above, and the air is introduced into the liquid storage chamber 36. You. Therefore, the gas-liquid interface is in the air introduction groove 50.
After reaching the upper end of the
The destruction and regeneration of the meniscus in the capillary force generating groove 60
During the consumption of the ink, the ejection liquid storage container 10 is repeated.
The negative pressure generated in the inside is controlled to be substantially constant. This negative pressure is determined by the force by which the atmosphere breaks the meniscus in the capillary force generation groove 60, and as described above, the capillary force generation groove 6
It is determined by the size of 0 and the characteristics (surface tension γ, viscosity η, contact angle, density ρ) of the ink used.

The pressure on the discharge port forming surface of the ink jet head 22 is determined by the capillary force of the capillary force generating groove 60, the pressure loss of the continuous porous elastic member 32, and the discharge liquid storage in which the liquid supply port 14A is formed. It is determined by the sum of the relative height between the container bottom and the discharge port forming surface.

As described above, when the ink is supplied from the liquid storage chamber 36 into the continuous porous elastic member 32 through the communication port 40, that is, when the gas-liquid exchange is performed, the ink is supplied to the continuous porous elastic member 32. , That is, between 10 and 20 mm from the inner bottom surface of the bottom wall 10B of the container 10 when there is a large void as in a conventional container, or when the compression ratio of the continuous porous elastic member is too high. However, according to the above-described ejection liquid storage container of the present invention, the ink passage cylinder 26 shown in FIG.
A predetermined amount (1 m) so as to enter the ink supply cylinder 14.
m) Even when in the so-called mounted state, the lower end surface of the pressure contact body 46 is positioned h2-1 outside the container inner bottom surface of the container bottom wall 10B, so that the pressure contact body 46 is h2. The amount of protrusion h1-2 inward from the bottom surface inside the container without being pushed in for -2 minutes. Therefore, the gap due to the separation distance L2-2 of the continuous porous elastic member 46 from the inner bottom surface of the container is small. The peel distance L2-2 is at most 2-3 mm. As a result, when gas-liquid exchange is performed as described above,
Since the ink flows in the continuous porous elastic member 32 between 10 and 20 mm from the inner bottom surface of the bottom wall 10B of the container 10, according to the ejection liquid storage container of the present invention, there are few voids near the pressure contact body 46. Flow is hardly obstructed.

Further, the increase in the compressibility in the vicinity of the continuous porous elastic member 32 with which the upper end surface of the pressure contact body 46 abuts is appropriately controlled, and the flow resistance due to the excessive increase in the compressibility of the continuous porous elastic member 32 is controlled. The ink flow is not hindered by the increase.

Further, a step 14C is provided around the liquid supply port 14A so as to protrude inward from the inner bottom surface of the bottom wall 10B of the container 10, so that the continuous porous elastic member 3 is provided.
2 is compressed inward in two stages, and the amount of the step is 0.
Since it is relatively small, ie, 3 to 0.7 mm, the continuous porous elastic member 32 does not form a void following the step. The pressing amount of the press contact body 46 that causes the bottom wall 10B of the continuous porous elastic member 32 to separate from the inner bottom surface of the container is (h1-
2)-(Step 14C height), and the effect of suppressing the expansion of the gap by the step 14C height is obtained.

[0085]

According to the present invention, since the upper end surface of the pressure contact body comes into contact with the negative pressure generating member, and the lower end surface is located outside the inner bottom surface of the bottom wall of the container. However, even if a predetermined thickness is given to the press-contact body, the upper end surface of the press-contact body raises the negative pressure generating member less than the inner bottom surface of the container, so that the compression ratio of the negative pressure-generating member that comes into contact with the press-contact body is significantly increased. Therefore, a large gap is not generated between the negative pressure generating member and the bottom wall, and stable supply without running out of liquid is performed.

According to the present invention, the arrangement position of the pressure contact body that can supply ink to the head satisfactorily is specified while considering the balance of negative pressure in the ink tank when the ink supply operation is performed.

In particular, a liquid storage having a structure in which the negative pressure generation member storage chamber storing the negative pressure generation member communicates with the negative pressure generation member storage chamber through the bottom communication path and is substantially sealed except for the communication path. By defining the position of the press contact body in the container in consideration of the negative pressure in the tank, it is possible to maintain good ink supply.

[Brief description of the drawings]

FIG. 1 is a schematic perspective view showing a discharge liquid storage container and a head-integrated tank case according to an embodiment of the present invention, wherein (A) shows before mounting and (B) shows after mounting.

FIG. 2 is a partially broken perspective schematic view showing the head-integrated tank case of FIG. 1;

FIG. 3 is a cross-sectional view of a main part of an example of a discharge liquid storage container for explaining parameters affecting the operation of the present invention.

FIG. 4 is a cross-sectional view of a main part of another example of a discharge liquid storage container for describing parameters affecting the operation of the present invention.

FIG. 5 is a cross-sectional view of a main part of the ejection liquid storage container according to the embodiment of the present invention, showing a state before mounting.

FIG. 6 is a cross-sectional view of a main part of the ejection liquid storage container according to the embodiment of the present invention, showing a state after being mounted.

FIG. 7 is a cross-sectional view showing a main part of another embodiment of the ejection liquid storage container of the present invention.

FIG. 8 is a cross-sectional view showing a conventional ejection liquid storage container.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Discharge liquid storage container 12 Atmosphere communication port 14 Ink supply cylinder 14A Liquid supply port 32 Continuous porous elastic member (negative pressure generating member) 34 First storage chamber 36 Second storage chamber 38 Partition wall 40 Communication port 42 Rib 44 Air buffer Chamber 46 Pressure contact body 50 Atmosphere introduction groove (first passage) 60 Capillary force generation groove (second passage)

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Kazuhiro Nakajima 3-30-2 Shimomaruko, Ota-ku, Tokyo Canon Inc. (72) Inventor Sou Kishida 3-30-2 Shimomaruko, Ota-ku, Tokyo Canon Inside the corporation

Claims (19)

[Claims] A negative pressure generating member storage chamber having an air communication portion communicating with the air and a liquid supply port for supplying a liquid to a recording means, and a negative pressure generating member stored therein; A liquid storage chamber that communicates with the member storage chamber via a communication path at the bottom and is substantially sealed except for the communication path; and a partition that extends upward from the communication path of the negative pressure generation member storage chamber. A liquid storage container for discharge comprising: a capillary force generating portion formed inside the partition wall, and an air introduction passage for introducing air from the negative pressure generating member storage chamber to the liquid storage chamber; A pressure contact body is disposed in a liquid supply port provided on the bottom surface of the pressure generation member storage chamber, and the upper end surface of the pressure contact body abuts the negative pressure generation member, and the lower end surface thereof is lower than the container inner bottom surface of the container. Characterized by being located outside Ejection liquid storage container. 2. The distance between the partition-side side surface of the press-contact body and the partition wall is 5 mm or more and 30 mm or less, the thickness of the press-contact body is 6 mm or more and 8 mm or less, and the upper end surface of the press-contact body is The pressure contact amount of the negative pressure generating member is 0 mm or more and 5 mm or less from the container inner bottom surface of the bottom wall of the container, and the lower end surface of the pressure contact body is 1.5 mm or more from the container outer surface of the container bottom wall. 2. The ejection liquid storage container according to claim 1, wherein the container is located outside by 3.5 mm or less. 3. The discharge according to claim 1, wherein a step is provided around the liquid supply port of the container so as to protrude inward from an inner bottom surface of a bottom wall of the container. Liquid storage container. 4. The liquid supply cylinder according to claim 1, wherein the liquid supply port is defined in a liquid supply cylinder formed so as to protrude outward from a container outer surface of a bottom wall of the container. One of the liquid storage containers for discharge. 5. An air introduction passage for introducing air from the capillary force generation section and the liquid storage chamber from the negative pressure generation member storage chamber to the partition wall. One of the liquid storage containers for discharge. 6. The discharge liquid container according to claim 1, wherein the pressure contact body is a felt made of polypropylene. 7. The discharge liquid storage container according to claim 1, wherein the discharge liquid storage container stores ink to be supplied to an inkjet head. 8. A negative pressure generating member storage chamber having an air communication portion communicating with the air and a liquid supply port for supplying a liquid to the recording means, and a negative pressure generating member storage chamber housing a negative pressure generating member therein; A liquid storage chamber that communicates with the member storage chamber via the communication path at the bottom and is substantially sealed except for the communication path, and a partition that partitions the negative pressure generation member storage chamber and the liquid storage chamber, A liquid storage container for discharge comprising: wherein the partition wall has a capillary force generating portion therein, and a pressure contact body is disposed in a liquid supply port provided on a bottom surface of the negative pressure generating member storage chamber; An end face is in contact with the negative pressure generating member, and a distance L1 between the communication path and the closest part of the pressure contact body from the communication path is set so as to satisfy the following expression. Storage container. L1 <(Hs−Hpa−h) / Δh Here, h is a capillary force obtained by dividing the pressure in the vicinity of the communication path by the product of the density ρ of the ejection liquid and the gravitational acceleration g, and converted into a dimension of length, that is, When the pressure near the communication path is ΔPca, h = ΔPca / ρg, and Hs is the capillary force of the negative pressure generating member and the density ρ of the discharge liquid.
Hs = ΔPs / ρg, where Hpa = ΔPs / ρg, where Hpa is the internal pressure of the negative pressure generating member. Δh is the position head difference between the gas-liquid interface and the vicinity of the communication passage, Δh is the pressure loss in the negative pressure generating member between the communication passage and the liquid supply port, and is the product of the density ρ of the ejection liquid and the gravitational acceleration g. Loss head converted to the dimension of length divided by
That is, when the pressure loss is ΔPe, Δh = ΔPe
/ Ρg. 9. The discharge liquid storage container according to claim 8, wherein a lower end surface of the pressure contact body is located outside a bottom surface inside the container. 10. Around the liquid supply port of the container,
The discharge liquid storage container according to claim 8 or 9, wherein a step portion protruding inward from a container inner bottom surface of a bottom wall of the container is provided. 11. The liquid supply port according to claim 8, wherein the liquid supply port is defined in a liquid supply cylinder formed so as to protrude outward from a container outer surface of a bottom wall of the container.
Any of the liquid storage containers for discharge. 12. The discharge liquid container according to claim 8, wherein the discharge liquid container stores ink to be supplied to an inkjet head. 13. A negative pressure generating member storage chamber having an air communication portion communicating with the atmosphere and a liquid supply port for supplying a liquid to the recording means, and containing a negative pressure generating member therein; A liquid storage chamber that communicates with the member storage chamber via the communication path at the bottom and is substantially sealed except for the communication path, and a partition that partitions the negative pressure generation member storage chamber and the liquid storage chamber, A liquid storage container for discharge comprising: a capillary force generating portion formed inside the partition and an air introduction passage for introducing air from the negative pressure generating member storage chamber to the liquid storage chamber; A pressure contact body is arranged in a liquid supply port provided on the bottom surface of the generation member storage chamber, and an upper end surface of the pressure contact body is in contact with the negative pressure generation member, and the communication path and the communication path of the pressure contact body are separated from each other. The distance L1 to the nearest location satisfies the following equation Discharging liquid container, characterized in that it is earthenware pots set. L1 <(Hs−Hp−h) / Δh Here, h is a capillary force obtained by dividing the pressure in the vicinity of the communication path by the product of the density ρ of the ejection liquid and the gravitational acceleration g, and converted into a dimension of length, that is, When the pressure near the communication path is ΔPca, h = ΔPca / ρg, and Hs is the capillary force of the negative pressure generating member and the density ρ of the discharge liquid.
When the capillary force converted into the dimension of the length divided by the product of the product of the negative pressure generating member and Δg is defined as ΔPs, Hs = ΔPs / ρg, and Hp is within the negative pressure generating member. Δh is the position head difference between the gas-liquid interface and the capillary force generating portion, Δh is the pressure loss in the negative pressure generating member between the communication path and the liquid supply port, and is the difference between the density ρ of the discharging liquid and the gravitational acceleration g. Loss head divided by product and converted to length dimension,
That is, when the pressure loss is ΔPe, Δh = ΔPe
/ Ρg. 14. The discharge liquid storage container according to claim 13, wherein a lower end surface of the pressure contact body is located outside a bottom surface inside the container. 15. Around the liquid supply port of the container,
14. The container according to claim 13, wherein a step portion is provided which protrudes inward from a bottom surface inside the container on a bottom wall of the container.
4. The liquid storage container for discharge of 4. 16. The liquid supply port according to claim 13, wherein the liquid supply port is defined in a liquid supply cylinder formed so as to protrude outward from a container outer surface of a bottom wall of the container.
5. The liquid storage container for discharge according to any one of items 5. 17. The discharge liquid storage container according to claim 13, wherein the discharge liquid storage container stores ink to be supplied to an inkjet head. 18. A negative pressure generating member storage chamber having an air communication portion communicating with the air and a liquid supply port for supplying a liquid to the recording means, and a negative pressure generating member storage chamber housing a negative pressure generating member therein; A liquid storage chamber that communicates with the member storage chamber via a communication path at the bottom and is substantially sealed except for the communication path; and a partition that extends upward from the communication path of the negative pressure generation member storage chamber. Wherein a pressure contact member is disposed in a liquid supply port provided on a bottom surface of the negative pressure generation member storage chamber, and an upper end surface of the pressure contact member contacts the negative pressure generation member. And the lower end surface thereof is located outside the inner bottom surface of the container, and a distance L1 from the communication passage to the closest point of the pressure contact body to the communication passage.
Wherein the liquid supply port is arranged so as to satisfy 5 mm ≦ L1 ≦ 60 mm. 19. The distance L1 is 10 mm ≦ L1 ≦ 5.
20. The ejection liquid storage container according to claim 18, which is 0 mm.