JPH0839819A - Ink jet recording device - Google Patents

Abstract

(57) [Summary] [Purpose] To stabilize the ejection amount of an ink in an ink jet recording apparatus regardless of the amount of ink in the ink tank. In an ink jet recording apparatus, each has an air communication hole and a filter section, and a plurality of ink containing chambers filled with ink-impregnated porous bodies or fiber bundles; A configuration having one common ink reservoir adjacent to the filter section and one ink supply port provided in the ink reservoir.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ink tank unit for supplying ink to an ink jet type recording head and a recording apparatus equipped with the same.

[0002]

2. Description of the Related Art As in the present invention, as a device having a plurality of ink storage chambers, there is JP-A-5-201021. This is provided with a plurality of compartments (21a to 21f) partitioned as shown in FIG. 11, and one of the plurality of compartments 21f is provided with a supply port 25 for supplying the recording liquid to the outside of the container. In addition, an atmosphere communication hole 24 for opening to the atmosphere is arranged in a chamber 21a different from the chamber in which the supply port is arranged, and each of the plurality of chambers is connected only by a continuous liquid supply member 23. It is composed. Here, the ink consumption process in JP-A-5-201021 will be described. As ink is consumed through the supply port 25 by driving the recording head, the supply port 2
The ink in the sixth chamber 21f provided with No. 5 is sucked out in an amount commensurate with the consumption amount. Since the sixth chamber 21f is only connected to the fifth chamber 21e via the liquid supply member 23 in addition to the supply port 25, the amount of ink sucked from the sixth chamber 21f to the supply port 25 is The liquid is supplied from the fifth chamber 21e through the gap of the liquid supply member 23. Similarly, ink is sequentially supplied from the chamber near the atmosphere communication hole 24, so that the ink is continuously supplied to the supply port 25. When there is no ink that can be supplied to the adjacent chamber near the air communication hole 24, the air supplied from the air communication hole 24 is supplied through the liquid supply member 23.
In this way, as shown in FIG. 12 of this manual, the ink is consumed in order from the chamber near the atmosphere communication hole 24.

[0003]

According to the prior art, for example, in the configuration shown in FIG. 11, as the ink is consumed, the ink is sequentially consumed from the chamber 21a near the atmosphere communication hole 24. There is a considerable difference in the ink supply resistance between the initial state where the ink is filled and the state where the remaining amount of ink is low (FIG. 12), and the ejection of ink from the print head is not uniform. That is, in the case of FIG. 11, when the ink is supplied, the sixth chamber 21f to the second chamber 21b
Although there is resistance during this period, the ink level is low.
In the case of 2, it only receives the resistance between the sixth chamber 21f and the fifth chamber 21e. Specifically, in the case of this configuration, it is the portion of the liquid supply member 23 where the ink exists that causes the ink supply resistance, and the frictional resistance when the ink moves is greater in the case of FIG. it is obvious. This is because the chambers (21a to 21f) are arranged in series with the ink supply port 25 and the atmosphere communication hole 24, and this is an unavoidable problem if this structure is adopted. Further, this problem becomes more remarkable as the size of the ink tank increases. In the ink supply, when the supply resistance is high, the amount of ink droplets ejected according to the drive of the recording head is small, and conversely, when the supply resistance is low, the amount of ink ejected is large. Therefore, in the case of the conventional technique, the ink ejection amount from the recording head becomes unstable depending on the ink amount inside the ink tank.

Further, in JP-A-5-201021, ink in each chamber is held by a capillary force acting on a porous member which is a liquid supply member to prevent leakage to the outside. The amount of ink that can be held is small. The reason is that, in the case of this conventional technique, the purpose is to store more ink in a predetermined volume of space,
In other words, since the ink storage efficiency is improved, the amount of the porous member is smaller than the amount of the ink stored, and the load per unit volume of the porous member that holds the ink is large. Therefore, it has been impossible to store a large amount of ink in the conventional technique. Specifically, the porous body and the fiber bundle when used as a holding material for ink are usually
The gaps between the minute walls and fibers that compose them are 100 to several hundred μ
The height of the ink liquid, into which the ink can be impregnated by the capillary force, is about 50 (d
yne / cm), density 1 (g / cm), contact angle 60 (d
eg. The maximum height of the ink is about 5 (cm). Therefore, for example, if the installation direction of the ink tank is not restricted as in the case of a recording device that can be carried, it is necessary to prevent the ink from being leaked to the outside because the ink is always held by the porous member. However, the size of the ink tank is limited to a size in which one side does not exceed 5 (cm), and it has been impossible to accommodate a large volume of ink. (Of course, this is the case where the ink tank and the recording device can be used regardless of the installation direction, and this does not apply to the stationary ink tank.) Furthermore, the conventional ink jet recording device In the above, as a matter of course, it was necessary to replenish the ink, which is a consumable item, according to the usage amount. Further, as another method, there is a method in which the ink tank is replaced by a cartridge method, or a method in which the print head is further integrated and replaced. In either method, the user himself replenishes ink or cartridges. Had to be replaced.

[0005]

According to another aspect of the present invention, there is provided an ink jet recording apparatus having a plurality of atmosphere communicating holes and a filter portion, each of which is filled with an ink-impregnated porous material or fiber bundle. Of the ink storage chamber and one common ink reservoir adjacent to the filter portion of each ink storage chamber, and one ink supply port provided with the ink reservoir, and from the common ink reservoir via the ink supply port. An ink jet recording apparatus characterized by supplying ink to a print head.

In the ink jet recording apparatus according to a second aspect of the present invention, the coarseness of the porous body or the fiber bundle in the ink containing chamber is closer to the filter portion side than to the atmosphere communication hole side. The ink jet recording apparatus according to claim 1, wherein

An ink jet recording apparatus according to a third aspect of the present invention is characterized in that the ink containing chamber has a shape in which the cross-sectional area is smaller on the filter portion side than on the atmosphere communication hole side. Is.

[0008]

According to the ink jet recording apparatus of the present invention, in an ink tank having a plurality of ink containing chambers, the ink in each ink containing chamber is not consumed in sequence, but the ink in each ink containing chamber is made uniform. It is possible to reduce the fluctuation of the supply resistance between the initial state and the time when the ink is used up, and it is possible to stabilize the ejection of ink by the print head from beginning to end.

According to the ink jet recording apparatus of the second aspect, in the ink tank filled with the porous member,
Since it is possible to reduce the amount of ink that remains in the porous member and cannot be used, and the use efficiency of the ink is improved, the ink tank can be downsized. Further, since the ink that cannot be used and is discarded is reduced, the cost can be reduced accordingly.

According to the ink jet recording apparatus of the third aspect, since the cross-sectional area of the ink tank on the side where the filter is disposed is narrowed, the filter side porous member is simply filled (pushed) with the columnar porous member. The members can be made dense, and the amount of ink remaining in the porous member can be reduced.

[0011]

【Example】

(Embodiment 1) An embodiment of the present invention will be described with reference to FIGS.

FIG. 1 is an external view of an ink jet recording apparatus equipped with the ink tank of the present invention. The recording head 1 is fixedly mounted on the carriage 2, and the carriage 2 reciprocates along the platen 3 to record on the recording paper wound around the platen 3. The ink supply tube 4 connects the ink supply port (not shown) of the ink tank 11 and the recording head 1 to supply ink.

FIG. 2 is a cross-sectional view of the ink tank 11 of the present invention. A plurality of ink storage chambers 14 are independently connected to a common ink reservoir 13 via filters 17, and the ink storage chamber A porous member (generically referred to as a porous body or a fiber bundle) 15 impregnated with ink is arranged inside. Further, each of the ink storage chambers 14 has an independent atmosphere communication hole 16.

Next, the process of ink consumption will be described. In FIG. 2, an amount of ink corresponding to the recording amount of the recording head is naturally supplied from the common ink reservoir 13 filled with ink to the recording head through the ink supply port 12 and further the ink supply tube. The same amount of ink as the amount of ink consumed in the common ink reservoir 13 is supplied from the ink storage chamber 14 through the filter 17. In addition, the same amount of ink as the amount of ink consumed in each ink storage chamber is introduced from the outside through the atmosphere communication hole 16. When the ink in each of the ink storage chambers 14 is consumed in this way, one of the ink storage chambers 14 is independently connected in parallel to the common ink reservoir 13
The ink is not consumed in sequence from one ink storage chamber, but is consumed more uniformly from each ink storage chamber. Therefore, the ink supply is stably performed from beginning to end.

Here, the filter 17 is provided to prevent air bubbles from being mixed in when the ink in each ink storage chamber 14 moves to the common ink reservoir 13. The ink held in the porous member 15 is in a mixed state of ink and air, and in the filter 17, only the ink is allowed to pass by the action of the surface tension of the ink itself, and the invasion of air bubbles into the common ink 13 is prevented. It is preventing. Next, the discharge states of the present application and the conventional example will be described in detail. In the case of the present application, the elements that generate resistance in the ink supply are the porous member and the filter member in each ink storage chamber, In the example, it is a portion of the width of the liquid supply member where the ink exists. Further, the filter member used in the present application is knitted with stainless thin wires as described later, and the gap between the thin wires is several μm to several tens of μm, so that it cannot be ignored like the resistance of the porous member. Therefore, in the initial state in which the ink is full and, for example, the total resistance after consuming just half the ink is half the resistance value in the related art, but there is almost no change in the present application. Therefore, stable ink ejection is possible.

In the filter 17, the surface tension of the ink itself makes it possible to reliably guide only the ink from the porous member 15. Therefore, the common ink reservoir 1
Air does not enter the inside of 3. The state at this time is shown in FIG.
The colored arrow in the ink containing chamber 14 shown in FIG.
Shows the size of the ink impregnation rate in the porous member 15,
In a state where air and ink are mixed, an arrow is drawn toward a portion where the proportion of ink is large. Here, as an example, it is assumed that polyurethane foam is used for the porous member and a stainless steel thin wire is used for the filter. It is important to note that in the process of manufacturing this ink tank, when inserting the polyurethane foam cut into a rectangular parallelepiped into the ink accommodating chamber 14, a uniform state is formed so that the roughness of the mesh does not become uneven. It means that you need to insert it. If there is a difference in the roughness of each part of the porous member 15, that is, there is a difference in the capillary force acting on that part, and the comparatively coarse part, that is, the capillary force. In the weak portion, the ink holding power is weak, and the ink is consumed by the ink tip in this portion.

FIG. 4 is a diagram showing how ink is consumed when the insertion of the porous members (15a to 15f) in each ink storage chamber 14 is uneven. For example, in the porous member 15c in the third ink containing chamber, the coarseness of the mesh is dense in the vicinity of the atmosphere communication hole 16,
The porous member 15f in the ink containing chamber is dense at both ends. Therefore, the manner in which the ink is consumed causes variations as indicated by the arrow direction in the figure. In this case, as the ink consumption proceeds, for example, the ink remaining in the porous member 15c is separated from the ink in the common ink reservoir 13 and becomes isolated. In this case, the residual ink is no longer consumed any more, and the efficiency of using the ink in the ink tank 11 as a whole is significantly reduced. In order to avoid this, as described above, it is necessary to insert the porous member 15 into the ink containing chamber 14 without bias.

The present invention is characterized by having a plurality of ink storage chambers, but this is for the following reason. That is, the advantage of providing a plurality of ink storage chambers is that more ink can be stored, and it will be described later that the partition of each ink storage chamber is eliminated and a large porous member is provided. As described in Example 4), a large amount of ink cannot be stored in the end because of ink leakage. Further, the production of a large porous member has a poor yield, and it is very difficult to insert a larger porous member into a box-shaped container such as an ink storage chamber in a uniform state. Further, since each of the plurality of ink storage chambers is provided with an atmosphere communication hole, even when a foreign substance or ink is clogged in one atmosphere communication hole, ink can be supplied from another ink storage chamber. It also has the advantage of not being disabled. In this case, it is conceivable that a partition of the ink containing chamber is eliminated and a plurality of atmosphere communicating holes are provided in one ink containing chamber. However, since this has a plurality of air inlets and outlets in the closed space, the inside of the ink containing chamber is There are drawbacks such as improved breathability and increased loss due to ink evaporation. As described above, in the present invention, a plurality of ink storage chambers are provided, and each ink storage chamber is provided with one atmosphere communication hole.

(Embodiment 2) Another embodiment of the present invention will be described with reference to FIG.

As described above, it is very important that the roughness of the mesh does not vary when the porous member is inserted. However, in the actual manufacturing of the ink tank, a rectangular parallelepiped shape that can be manufactured at the lowest cost is often adopted in the manufacturing process of the porous member, and the porous member formed in the rectangular parallelepiped is used without any deviation. It is very difficult to place it in the eye, and it is inevitable that the roughness of the eyes will vary. In order to solve the problem, the second aspect of the present invention will now be described.
Examples will be described. FIG. 5 shows an embodiment of the present invention, and the overall configuration of a recording apparatus equipped with the same and the internal structure of the ink tank 11 are substantially the same as those of the first embodiment described above, and will therefore be omitted. Here, in the ink tank of the present invention, as shown in FIG. 5, the ink storage chamber 14 has a shape that is narrow in the vicinity of the filter 17 and is wide on the side of the atmosphere communication hole 16 and a rectangular parallelepiped-shaped porous member therein. It is obtained by inserting 15. By doing so, the porous member is compressed in the vicinity of the filter 17, and the coarseness of the mesh becomes dense, so that the ink holding force in this portion becomes stronger than in other portions. Therefore, the ink is consumed in order from the side of the atmosphere communication hole 16 where the ink holding power is relatively weak, and the ink with which each porous member 15 is impregnated is always located at the filter 17 as shown in FIG. Since the ink in the common ink reservoir 13 is continuous, there is no ink isolated in the ink storage chamber 14, and the amount of remaining ink can be greatly reduced.

The roughness of the porous member will now be described. The unit of the roughness of the porous member is usually represented by the number of cells per inch. For example, 40 [ce
11 / inch] and 50 [cell / inch], the eyes of 50 [cell / inch] are more dense. In addition, since the actual porous member is three-dimensional, it is necessary to define it in three dimensions (three directions). In the case of FIG. 5, the roughness of the eyes becomes “dense” according to the direction of the arrow, but X, Y, Z = 40, 120, 40 on the atmosphere communication hole side.
[Cell / inch] (X represents the vertical direction of the ink containing chamber, Y represents the horizontal direction of the ink containing chamber, Z represents the depth direction of the ink containing chamber), and X, Y, Z = on the filter side.
It will be 40, 160, 40 [cell / inch]. That is, by making the roughness of the mesh near the filter member "closer" than the other portion (atmosphere communication hole side), the ink holding force is increased on the ink reservoir side (filter side) by the action of the capillary force. Flow (flow from the "sparse" atmosphere communication hole side to the "dense" filter side of the eye) smoothly. Also, since the porous body is a continuous body, it does not suddenly become "coarse" between itself and other parts,
Since the ink gradually changes, the ink in the ink storage chamber can be continuously used.

(Embodiment 3) Another embodiment of the present invention will be described with reference to FIG.

Similar to the second embodiment, the overall structure of the recording apparatus and the internal structure of the ink tank 11 are substantially the same, and therefore will be omitted. Here, in the ink tank of the present invention, as shown in FIG. 6, the attachment portion of the filter 17 projects inside the ink containing chamber 14, and when the rectangular parallelepiped porous member 15 is inserted, the filter 17 is compressed. It is configured to be. Therefore, the ink holding force at this portion of the porous member 15 is stronger than that at other portions,
As in the case of the second embodiment, the ink consumption is performed sequentially from the atmosphere communication hole 16 side, and this method can greatly reduce the amount of ink that remains.

(Embodiment 4) Another embodiment of the present invention will be described with reference to FIGS.
This will be described with reference to FIG.

In this embodiment, an ink tank that can be used regardless of its installation orientation, or a recording apparatus equipped with the ink tank, can be used without causing ink leakage. The ink containing chamber formed within the range of not exceeding 5 cm in the direction of
A plurality of the ink jet recording heads according to the first embodiment are provided to store the recording ink.

FIG. 7 is a sectional view of an ink tank of embodiment 4 according to claim 3 of the present invention, and the construction is the same as that of FIG. 2 according to claim 1 described above. For convenience of explanation of ink leakage, it is assumed that the atmosphere communication hole 16 is installed downward. As shown in the figure, the size of each ink storage chamber is such that each side does not exceed 5 cm. Although not shown in the figure, it is assumed that the dimension in the direction perpendicular to the paper surface is also set to a size corresponding to this. Here, since the height of the porous member 15 in each ink storage chamber 14 is 5 cm, the ink with which the inside is impregnated can be sufficiently held. Therefore, as shown in the figure, the ink does not leak even if the atmosphere communication hole 16 where the ink may leak is located below, but the size in the height direction exceeds 5 cm as shown in FIG. If configured, the ink that cannot be retained inside the porous member 15 will leak to the outside through the atmosphere communication hole.

FIG. 8 is a sectional view when the ink tank 11 of FIG. 7 is installed in another direction. In this case, the height of the entire ink tank 11 exceeds 5 cm, but the ink in each ink storage chamber 14 is held by each porous member 15, and the height direction of each porous member is high. Since the dimension is within 5 cm, the ink does not leak to the outside. In this case, the common ink reservoir 13 is used as the ink not held by the porous member.
Although there is ink inside, the reason why this ink does not leak outside will be described below.

In the common ink reservoir 13 of FIG. 9, the ink supply port 12 is a port where ink may leak.
And the filter 17 only. Ink supply port 12
1 is connected to the recording head 21 via the ink supply tube 4 as shown in FIG. 1, and communicates with the outside from the ink ejection port of the recording head. Therefore, common ink reservoir 1
3 is a space in which both ends thereof are sandwiched between the ink ejection port of the recording head and the filter 17. Here, if it is assumed that the common ink reservoir 13 leaks to the outside, the same volume of ink or air should be supplemented from the outside into the space. However, the ink ejection openings and part of the filter of the recording head located at both ends of the space both have very small hole diameters and are always in contact with the ink. No ingress of air from In addition, there is a possibility that the ink may enter this portion due to the ink in each ink containing chamber 14, but since this ink is held by the porous member 15, the ink is forcibly driven when the recording head is driven. It cannot be moved unless ink is sucked out. Therefore, in a natural state, there is no possibility that ink or air will enter the space from the outside, that is, the ink will not leak from the space to the outside.

Next, the size of each ink storage chamber is 5 on each side.
The grounds for limiting within the range not exceeding cm will be described in detail.

The average diameter of the pores constituting the porous member is D,
The contact angle between the porous member and the ink held by the porous member is θ,
Assuming that the surface tension of the ink is T, the specific gravity of the ink is ρ, the acceleration of gravity is g, and the height of the ink held by this porous member is h, the balance between the capillary force and the weight of the ink results in the porous member. The range in which the ink can be held by the capillary tube is obtained in the range where the following equation is satisfied, that is, when the capillary force is larger.

ΠDTcos> π (D / 2) ² ρgh Here, each value when a general water-based ink used as an ink jet system and a polyurethane porous member is used is D = 2 × 10 ⁻² [Cm], θ = 60 [°], T = 50
[Dyne / cm] ρ = 1.1 [g / cm ³ ] and g = 980 [cm / s ² ] and by substituting these, h ≦ 5 [c
m] is obtained. Therefore, the length of one side of the porous member is 5 cm.
In the following, it is possible to hold the ink inside, and conversely, when an ink containing chamber whose one side length exceeds 5 cm is used, even if a porous member is arranged inside the ink containing chamber, However, it is impossible to retain all the ink, and the ink that is not retained and remains is very fluid, and there is a great risk of leaking to the outside from the atmosphere communication hole or the like.

According to the present embodiment, since ink does not leak, it is possible to provide a recording apparatus that can be used regardless of the orientation of its installation, and this makes it possible to carry portable recording. The device can be realized.

(Embodiment 5) Another embodiment of the present invention is shown in FIG.
It will be described based on.

In the present embodiment, since the recording apparatus can be continuously used for a long time and the operation of the recording apparatus by the user for replenishing the ink can be omitted, the present invention is preferable.
By configuring a large ink tank as a whole with the same configuration as the above, storing a large amount of ink in the ink tank in advance, and not replacing the ink tank portion and refilling the ink,
The recording device is a disposable type.

The ink tank of this embodiment is provided with a plurality of ink storage chambers therein in the same manner as in the first to fourth embodiments, and a total of 300 c of usable ink is previously stored in the ink storage chamber.
c. It is assumed that the above ink is contained. As a specific example, as shown in FIG. 10, the size of each ink storage chamber in the ink tank is 5 [cm] × 3 [cm] × 4 [cm].
And, it shall be equipped with nine of them. This size is a range that can be carried around as a notebook size recording device, and in this case, the total volume of the ink storage chamber is 540c.
c. If the proportion of the ink is 70%, the ink amount is 378 cc. Becomes Furthermore, 10% of this is left unused and is not vaporized from the atmosphere communication hole and cannot be used, and the total amount of ink that can be used is 340 cc. Becomes

Next, this 340 cc. Calculate the print amount that can be recorded with the ink. According to the results of the experiment, the average number of dots per alphanumeric character is 226 dots,
If you record 1500 characters on a sheet of size paper,
The number of dots per sheet is 3.39 × 10 ⁵ dots. Further, the ink amount per dot is 6 × 10 ⁻⁸ cc. Therefore, 340 cc. Approximately 17,000 A4 sheets can be recorded at. This is a recording device that can be used for about 10 years when it is used by an individual.
The usable ink amount is 300 cc. This recording device can be a disposable type if it can be accommodated as described above.

According to this embodiment, since a large amount of ink is stored in the ink tank in advance and the ink tank portion is not replaced and the ink tank is not replenished from the outside,
Ink leakage due to mistakes at the time of replacement and the time and effort of replacement can be eliminated, and there is no need to provide an ink level detector to notify the time of replacement or replenishment, and considerable cost reduction can be expected, and It is possible to provide a recording device that is very easy for the user to handle. Furthermore, since the ink does not run out during use, continuous printing for a long time or the like is possible, and it is possible to provide a recording apparatus suitable for printing on roll paper or the like.

[0038]

According to the ink jet recording apparatus of the first aspect, in an ink tank having a plurality of ink containing chambers, the ink in each ink containing chamber is not consumed in sequence but the ink in each ink containing chamber is consumed. It is possible to consume evenly and to reduce the fluctuation of the supply resistance from the initial state until the ink is used up, and it is possible to stabilize the ejection of ink by the print head from beginning to end. An inkjet recording device can be provided.

According to the ink jet recording apparatus of the second aspect, in the ink tank filled with the porous member,
Since it is possible to reduce the amount of ink that remains in the porous member and cannot be used, and the use efficiency of the ink is improved, the ink tank can be downsized. In addition, since the amount of ink that cannot be used and is discarded is small, the cost can be reduced accordingly, and an inexpensive inkjet recording device with good printing accuracy can be provided.

According to the ink jet recording apparatus of the third aspect, since the sectional area of the ink tank on the side where the filter is arranged is narrowed, the porous member on the filter side is simply filled (pushed) with the columnar porous member. Can be made dense, the amount of ink remaining in the width of the porous member can be reduced, and an inkjet recording device excellent in handling can be provided.

[Brief description of drawings]

FIG. 1 is an overall perspective view of a recording apparatus according to the present invention.

FIG. 2 is a cross-sectional view of an ink storage portion showing a first embodiment of the present invention.

FIG. 3 is a diagram showing an ink consumption state in each ink storage unit in the ink tank.

FIG. 4 is a diagram showing an ink consumption state when the filling of the porous member in each ink storage chamber varies.

FIG. 5 is a cross-sectional view of an ink storage unit showing a second embodiment of the present invention.

FIG. 6 is a cross-sectional view of an ink containing portion showing a third embodiment of the present invention.

FIG. 7 is a cross-sectional view of an ink storage portion showing a fourth embodiment of the present invention.

FIG. 8 is a diagram showing that ink leakage occurs when the size of one side of the ink containing portion is large.

FIG. 9 is a diagram showing a state in which the ink tank of the present invention is installed in another direction.

FIG. 10 is an overall perspective view of a recording apparatus showing a fifth embodiment of the present invention.

FIG. 11 is a cross-sectional view of an ink tank portion of a conventional device.

FIG. 12 is a diagram showing a state in which the amount of ink remaining in the ink tank of the conventional apparatus is low.

[Explanation of symbols]

 1 Recording Head 2 Carriage 3 Platen 4 Ink Supply Tube 11 Ink Tank 12 Ink Supply Port 13 Common Ink Reservoir 14 Ink Storage Chamber 15 Porous Body or Fiber Bundle 15a Porous Body or Fiber Bundle 15b Porous Body or Fiber Bundle 15c Porous Body or fiber bundle 15d Porous body or fiber bundle 15e Porous body or fiber bundle 15f Porous body or fiber bundle 16 Atmosphere communication hole 17 Filter 21a Ink storage chamber 21b Ink storage chamber 21c Ink storage chamber 21b Ink storage chamber 21e Ink storage Chamber 21f Ink storage chamber 23 Liquid supply member 24 Atmosphere communication hole 25 Supply port

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor ▲ Tsuru ▼ Yasushi I, 22-22 Nagaike-cho, Abeno-ku, Osaka-shi, Osaka Prefecture Sharp Corporation (72) Inventor ▲ Hisashi Mura, Nagaike-cho, Abeno-ku, Osaka-shi, Osaka 22-22 No. 22 Sharp Corporation (72) Inventor Yoshio Kanayama No. 22-22 Nagaikecho, Abeno-ku, Osaka City, Osaka Prefecture 22-22 Inside Sharp Corporation

Claims (3)

[Claims] 1. A plurality of ink accommodating chambers each having an atmosphere communication hole and a filter part, each of which is filled with a porous material or a fiber bundle impregnated with ink, and adjacent to the filter part of each ink accommodating chamber. An ink jet recording apparatus having one common ink reservoir and one ink supply port provided in the ink reservoir, wherein ink is supplied from the common ink reservoir to the print head through the ink supply port. . 2. The coarseness of the porous body or the fiber bundle in the ink containing chamber is higher on the filter section side than on the air communication hole side. Inkjet recording device. 3. The ink jet recording apparatus according to claim 1, wherein the ink storage chamber has a shape in which the cross-sectional area is smaller on the filter section side than on the air communication hole side.