JP2003175626A - Ink cartridge - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an ink cartridge in which a bubble being mixed at the time of drawing ink from a first chamber into a second chamber is not pulled directly into a recording head which can thereby be prevented from not ejecting ink. <P>SOLUTION: The ink cartridge 1 comprises a first chamber 9 for containing a porous material 8 absorbing ink, and a second chamber 10 communicating with the first chamber 9 through a communication hole 15 made at a lower part thereof and containing ink, which are formed in a case 2 by a partitioning wall 7. The second chamber 10 is provided with an opening 17 for supplying ink to a recording head 72, and since a barrier wall 31 is provided on the shortest path connecting the communication hole 15 and the ink supply opening 17, a bubble is prevented from being pulled into the second chamber 10 from the first chamber 9. The bubble is floated when the ink flows while detouring the barrier wall 31 and only ink can be fed to the recording head 72. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ink cartridge that contains ink to be supplied to a recording head in an image forming apparatus.

[0002]

2. Description of the Related Art Conventionally, an image forming apparatus such as an ink jet type printer records an image on a recording medium by ejecting ink droplets from nozzles of a recording head mounted on a carriage. The ejection is performed by driving an actuator such as an electromechanical conversion element or an electrothermal conversion element arranged in the recording head to generate a pressure wave. The ink is supplied from an ink cartridge that is replaceably mounted on the recording head, but if air bubbles are mixed in the ink liquid supplied from the ink cartridge, ink ejection from the nozzles of the recording head is adversely affected. It is known.

The ink cartridge has an ink supply port for supplying ink to the recording head and an atmosphere communication hole for communicating with the atmosphere so that air flows in in response to a decrease due to consumption of ink. Therefore, after the ink is filled in the manufacturing process of the ink cartridge, all of these openings are sealed by the sealing member. In addition, at the time of shipment, in order to prevent ink leakage and air intrusion into the case in an unused state, an ink cartridge containing ink is hermetically housed in a packaging bag under reduced pressure (so-called vacuum pack). (See, for example, JP-A-7-132611). Then, at the time of use by the user, the ink cartridge is taken out from the packaging bag, the sealing member is peeled off, the atmosphere communication hole is opened, and the ink supply port is communicated with the recording head.

[0004]

By the way, in such an ink cartridge, the first ink chamber for accommodating the porous absorbent material impregnated with the ink and the ink are drawn from the ink chamber in the case, and the print head is provided. There is one in which a partition wall separates and forms a second ink chamber having an ink supply port for supplying ink. In such a configuration, when air bubbles are mixed into the ink when the ink is supplied from the first ink chamber to the second ink chamber, the bubbles are drawn into the recording head from the second ink chamber. Therefore, the recording head may not be able to eject ink.

The present invention has been made in order to solve the above problems, and has an ink supply port for supplying ink to the print head from the first chamber which contains the porous absorbent material impregnated with ink. When ink is drawn into the second chamber,
It is an object of the present invention to provide an ink cartridge capable of preventing bubbles from being directly drawn into a recording head even if bubbles are mixed, and preventing the recording head from ejecting ink.

[0006]

In order to achieve the above object, the invention of claim 1 provides an ink cartridge for containing ink to be supplied to a recording head,
A first chamber for accommodating a porous material that has absorbed ink by a partition wall in a case constituting the cartridge;
A second chamber for accommodating ink through a communication hole provided in the lower part of the first chamber is formed, and an ink supply port for supplying ink to the recording head is provided in the second chamber; The ink cartridge is characterized in that a barrier is provided on the shortest path connecting the communication hole and the ink supply port.

According to this structure, when the recording head draws the ink from the second chamber due to the negative pressure as the ink is ejected from the recording head, the bubbles that try to enter the second chamber are drawn from the first chamber. Is blocked by the barrier, and while the ink bypasses the barrier, the bubble is levitated, and almost only the ink can be supplied to the recording head, and as a result, the recording head is prevented from ejecting. It can be reduced.

According to a second aspect of the present invention, in the ink cartridge according to the first aspect, the second chamber is formed in an open state at one end of the case, and the ink is supplied to a lid member covering the open surface. A mouth is formed, and the barrier is formed on either one of the lid member and the partition wall facing the lid member. According to this configuration, since the second chamber is constituted by the case and the lid member, the barrier can be easily molded, and the curved flow path between the communication hole and the ink supply port can be easily assembled. You can

According to a third aspect of the present invention, in the ink cartridge according to the second aspect, the second chamber has a first portion located below the first chamber, and a side portion of the first chamber. The communication hole includes a second portion located between the side wall and the side wall of the case, the communication hole is open to the first portion, and the barrier is located at the first portion. According to this configuration, the bubbles that have entered the second chamber from the first chamber bypass the barrier, float up at the second portion, and collect at the upper portion of the second portion. Therefore, it is possible to significantly reduce the bubbles drawn into the recording head.

According to a fourth aspect of the invention, in the ink cartridge according to the third aspect, the partition wall between the first and second chambers constitutes the ceiling surface of the first portion of the second chamber. The part is inclined so that it rises towards the second part. According to this configuration, since the ceiling surface of the first portion is inclined so as to rise toward the second portion, it is possible to reliably guide the bubbles to the upper portion of the second portion,
It is possible to significantly reduce the number of bubbles drawn into the recording head.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows a state in which the ink cartridge according to the present embodiment is connected to a recording head. A carriage 52 that scans and moves along a recording medium is mounted with a head holder 50 that supports a recording head 72. The ink cartridge 1 is detachably attached to the head holder 50. The ink supply port 17 provided on the lower surface of the ink cartridge 1 is fitted into the joint member 74 on the head holder 50 side, and the ink is distributed to a large number of ink ejection channels of the recording head 72 through the manifold member 73. The recording head 72 ejects ink from each ink ejection channel by driving an actuator composed of a piezoelectric element or a heating element as is well known.

Ink cartridge 1 according to the present embodiment
Comprises a case 2 made of a transparent or translucent resin material in a rectangular shape, and upper and lower lid members 3 and 4. The case 2 includes a pair of first side walls 2a and 2b facing each other and a pair of second side walls 2c and 2d connecting the pair of side walls.
And has a rectangular tubular shape with open upper and lower end surfaces. The upper and lower lid members 3 and 4 are heat-welded so as to cover both upper and lower open surfaces of the case 2. Furthermore, Case 2
Partition walls 5 and 6 extending substantially parallel to the first side walls (left and right walls in FIG. 3), a bottom partition wall 7 that is connected to the lower ends of both partition walls and extends substantially parallel to the bottom opening surface, and the bottom thereof. The interior is partitioned by partition walls 7a, 7b, 7c extending vertically from the partition wall 7 toward the bottom open surface. Partition walls 5, 6, bottom partition wall 7, and partition wall 7a,
7b extends in a direction bridging between the second side walls 2c and 2d.

The upper surface of the case 2 is surrounded by the partition walls 5 and 6, the bottom partition wall 7 and the second side walls 2c and 2d.
An open first chamber 9 is formed at the upper end of the container, and contains a porous material 8 such as polyurethane foam that has absorbed ink. One of the first side walls 2a, the partition wall 5 and the second side
In the place surrounded by the side walls 2c and 2d of the second chamber 10
Is formed and is surrounded by the other side 2b of the first side walls, the partition wall 6 and the second side walls 2c and 2d, the atmosphere communication passage 11 is formed. Second chamber 10 and atmosphere communication passage 11
Have their upper ends opened on the upper surface of the case 2, their lower ends bent along the lower surface of the bottom partition wall 7, and their lower ends opened on the lower surface of the case 2.

The upper lid member 3 includes a first chamber 9 and a second chamber 10.
And the side wall 2 covering the upper ends of the atmosphere communication passage 11 respectively.
a, 2b, 2c, 2d and the upper ends of the partition walls 5, 6 are fixed by heat welding to separate the chambers 9, 10 and the passage 11. The lower lid member 4 covers the lower ends of the second chamber 10 and the atmosphere communication passage 11, respectively, and forms side walls 2a, 2b,
The second chamber 10 and the passage 11 are made independent by being fixed to the lower ends of 2c, 2d and the partition walls 7a, 7b by heat welding. As a result, the second chamber 10 and the atmosphere communication passage 11
Is substantially L-shaped from the vertical portions 10a along the side walls 2a and 2b and the horizontal portions 10b and 11b located below the first chamber 9. In addition, the vertical portion of the atmosphere communication passage 11
a and the horizontal portion 11b are the communication ports 3 provided in the partition wall 7b.
It communicates through 0.

A communication hole 15 for connecting the first chamber 9 and the second chamber 10 is formed in the bottom partition wall 7. Ink is contained in each of the first chamber 9 and the second chamber 10, and both chambers form an ink chamber. The second chamber 10 serves as a passage at the time of ink filling as described later, and also serves as a relay chamber when the ink is supplied from the first chamber 9 to the recording head 72. The first chamber 9 is formed sufficiently larger than the second chamber 10. The atmosphere communication passage 11 supplies air to the first chamber 9 when the ink in the first chamber 9 is consumed. The second chamber 10 and the atmosphere communication passage 11 are separated from each other by a partition wall 7a on the lower surface of the bottom partition wall 7. As described above, the partition walls 5 and 6 are provided on both sides of the case 2 substantially in parallel with the side walls 2a and 2B, and the side part has a substantially double wall structure to increase the case strength. Further, the case 2 having such a shape can be easily resin-molded by a mold which is separated into upper and lower parts.

An ink filling port 13 is formed in the upper lid member 3 so as to correspond to the upper end open surface of the second chamber 10, and the first lid member 3 is also provided.
A pressure reducing port 14 for reducing the pressure inside the case at the time of ink filling is formed so as to face the upper open surface of the chamber 9. Second
Communication hole 1 for communicating the chamber 10 and the first chamber 9 with each other.
The reference numeral 5 is arranged at the end far from the side where the ink filling port 13 and the decompression port 14 are arranged, that is, on the opposite side to the same side, and increases the ink filling efficiency and the ink consumption efficiency as described later. I am trying.

Further, the first chamber 9 and the atmosphere communication passage 11 are
The upper lid member 3 is communicated with a passage 16 formed so as to straddle the upper end of the partition wall 6. That is, the passage 16
Are formed in a concave shape on the upper surface of the upper lid member 13, one end of which is communicated with the first chamber 9 through the pressure reducing port 14, and the other end is communicated with the atmosphere communication passage 11 through the through port 16a. The upper lid member 13 has a wall 27 that projects into the first chamber 9 and contacts the upper surface of the porous material 8. That is, the upper lid member 3
Is thickly formed in a portion corresponding to the first chamber 9 and slightly compresses the ink absorbing material 8. The wall 27 is spaced from the inner surface of the first chamber 9 as described later, and the decompression port 14 is located inside the first chamber 9 with respect to the outer periphery of the wall 27.

An ink supply port 17 for supplying the ink in the second chamber 10 to the recording head is formed in the lower lid member 4 so as to correspond to the lower end open surface of the second chamber 10. Atmosphere communication holes 18 are respectively formed corresponding to the lower end open surfaces of 11. As shown in FIG. 6, the communication hole 15 and the ink supply port 17 are positioned so as to be offset from each other when seen from a plane, and the communication hole 15 and the ink supply port 1 are provided in the second chamber 10.
A rib-shaped barrier 31 is formed on the shortest path connecting with 7. The barrier 31 is preferably formed by integrally projecting from the partition wall 7 of the case 2 and joined to the inner wall surface of the lower lid member 4, but it is also possible to integrally project from the lower lid member 4. It doesn't matter. Lower surface 7d of the bottom partition wall 7
(FIG. 3) is an inclined surface that rises from the lower end of the communication hole 15 toward the vertical portion of the second chamber 10. One end of the barrier 31 is located on a side portion of the communication hole 15,
The other end extends close to the vertical portion of the second chamber 10. Accordingly, when the ink is drawn from the second chamber 10 by the negative pressure generated by the ink ejection from the recording head 72, the ink flow leaving the communication hole 15 from the first chamber 9 passes through the barrier 31 as indicated by the arrow 32. Detour and pass through the vertical portion 10a of the second chamber 10 again to the horizontal portion 10 of the second chamber 10.
It enters into b and reaches the ink supply port 17.

As shown in FIG. 4, the ink filling port 13 and the decompression port 14 are closed by the first sealing materials 21 and 22 attached to the outer surface of the upper lid member 3 by heat welding or the like after the ink filling. . The sealing material 22 secures the passage 16 and covers the upper surface thereof. The ink supply port 17 and the air communication hole 18 are
The second sealing material 2 which is detachably attached by heat welding or the like
It is closed at 3. Ink filling port 13 and ink supply port 1
Since the second sealing material 23 is different from the second sealing material 7, the second sealing material 23 is attached to the ink supply port 17 in advance before the ink is filled. Therefore, unlike the conventional one in which the ink supply port 17 also serves as the ink filling port 13, the surroundings of the ink supply port 17 are not wet with the ink at the time of filling, and the ink supply port is weak enough not to be deformed. Even with heat welding, a sufficient sealing effect can be obtained. Seal material 21,22
Does not need to be peeled off, and may be firmly heat-welded to such an extent that the upper lid member 3 is slightly deformed. Each sealing material 21,
22 and 23 are made of an air impermeable resin or metal foil or a laminated material thereof.

A stainless mesh filter 24 is attached to the surface of the ink supply port 17 on the second chamber 10 side. The filter 24 has such a size that the ink in the second chamber 10 does not leak in a natural state due to surface tension.

As shown in FIG. 10, a partition wall 29 for partitioning the atmosphere communication passage 11 into upper and lower portions is formed in the middle of the vertical portion 11a of the atmosphere communication passage 11. The partition wall 29 is
The atmosphere communication passage 11 extends in the vertical direction with a height difference, a through hole 28 is formed in the high portion, and a concave portion serving as an ink reservoir 29a is formed at a position lower than the upper end surface of the through hole 28. . When the case 2 is resin-molded, the partition wall 29 can be molded at the separated parts of the molds that are separated vertically, and no special processing is required.

Further, the ink reservoir 4a is also formed around the peripheral wall 18a of the atmosphere communication hole 18 of the lower lid member 4 by projecting it upward in a cylindrical shape. As a result, the ink cartridge may fall over and the passage 16 may be removed from the first chamber 9.
Ink that has leaked through the ink is accumulated in the ink reservoir 29a.
Further, even if the ink in the ink reservoir 29a may enter the through hole 28 due to tilting of the ink cartridge or the like, it will be accumulated in the ink reservoir 4a below it. Therefore,
The air communication passage 11 and the air communication hole 18 are blocked,
Ink does not leak outside.

As shown in FIGS. 6 and 19, in the case 2, the second chamber 10 and the horizontal portion 10 of the atmosphere communication passage 11 are provided.
A space 33 is formed adjacent to b and 11b. The space 33 is defined by a partition wall 7c that bridges between the partition walls 7a and 7b, the lower surface of which is covered with the lower lid member 4, and the space 33 communicates with the second chamber 10, the first chamber 9, and the atmosphere communication passage 11. The lower lid member 4 communicates with the outside of the case through the opening 34 provided in the lower lid member 4. Ink cartridge 1 filled with ink
At the time of shipping, as shown in FIG. 19, the package is hermetically housed in a packaging bag 81 in a reduced pressure state. Packaging bag 81
Is a cylindrical member in which the ink cartridge 1 is housed, a negative pressure is sucked inside, and both open ends are welded 82. The packaging bag 81 is made of air impermeable resin or metal foil or a laminated material thereof. Figure 1
9 is a cross section of the ink cartridge 1 shown in FIG.
Corresponds to the C line cross section. The opening 34 is not covered with the second seal material 23. When the inside of the packaging bag 81 is in a depressurized state, the space 33 is also in a depressurized state in the space 33, and the volume thereof acts to maintain the sealed packaging bag 81 in a depressurized state for a long period of time. is there. This allows
Prevents air from entering the ink inside the case when not in use.

FIG. 11, FIG. 12 and FIG. 13 show the structure of the passage 16 in detail. The configuration shown in FIG. 11 is created as a reference for explaining the problem.
In this figure, a passage 16b is formed so as to penetrate through the upper lid member 3 and connects the first chamber 9 and the atmosphere communication passage 11 to each other. Although not shown, the upper surface of the passage 16b is covered with the sealing material 22. In such a case, the edge (ridge line) E1 formed by the partition wall 6 and the side walls 2c and 2d, and the partition wall 6
Ink easily collects at the edge E2 formed by the upper lid member 3 due to the capillary phenomenon. Moreover, since the edges E1 and E2 are continuous with the edge E3 formed by the inner surface of the passage 16b and the partition wall 6, the ink collected at the edges E1 and E2 is edge E3 due to the capillary phenomenon as shown by the arrow R. And further flows out along the edge E4 in the atmosphere communication passage 11. When the ink penetrates from the first chamber 9 toward the atmosphere communication passage 11, if the case is transparent or translucent,
It becomes unsightly, and further, there is a problem that the ink cannot be supplied from the first chamber 9 to the recording head 72 because it leaks to the outside of the case or blocks the atmosphere communication passage 11.

As shown in FIG. 12, in order to eliminate the above-mentioned problems, the outer periphery of the wall 27 projecting from the upper lid member 3 toward the first chamber 9 has a distance K from the inner surface of the first chamber 9. I have. The decompression port 14 has a cylindrical shape, a rounded rectangle, or the like, has a shape without an edge on the inner surface, and is located at an end of the wall 27 away from the partition wall 6. With this configuration, the inner edge of the partition wall 6 on the side of the first chamber 9 has the passage 16
And the atmosphere communication passage 11 is not connected only by the inner edge formed by the two planes. That is, the lower surface of the wall 27, the outer periphery of the wall 27, and the inner surface of the decompression port 14 have a shape that does not have an inner edge formed by the two planes, and the inner edge of the partition wall 6 on the first chamber 9 side has these surface portions. It is connected to the atmosphere communication passage 11 via. Therefore, the wall 27 is made of the porous material 8
It is possible to prevent the ink that oozes out by, for example, compressing the ink or the ink that collects at the inner edge on the first chamber 9 side from flowing out to the passage 16 or the atmosphere communication passage 11 side due to the capillary phenomenon.
The inner surface of the decompression port 14 in contact with the porous material 8 also has no inner edge, and the decompression port 14 is provided in the thick portion of the upper lid member 3.
Is located and the height of the decompression port 14 is sufficiently high, the ink in the porous material 8 passes through the inner surface of the decompression port 14 and passes through the passage 16
It is also prevented from entering the. Even if the gap between the outer periphery of the wall 27 and the partition wall 6 is small and the ink may rise in the gap due to the capillary phenomenon, the upper end of the partition wall 6 is welded to the lid member 3. Ink does not enter the atmosphere communication passage 11.

When the pressure reducing port 14 has a shape with an edge on the inner surface, the same effect can be obtained even if the inner surface of the passage 16 has a cross-sectional shape without an edge such as a semi-cylindrical shape or a rounded rectangle. .

FIG. 13 shows a structure in which the passage portion is further improved. In FIG. 12, the decompression port 14 penetrates the wall 27, but the wall 27 is provided between the outer periphery of the wall 27 and the partition wall 6. It is provided without contact. That is, since the inner surface of the decompression port 14 does not directly contact the porous material 8 and has a space, the ink in the porous material 8 is further prevented from leaking through the inner surface of the decompression port 14. To be done.

An ink remaining amount detection sensor 60 is provided on the carriage 52 of the ink jet printer. That is, in the unused state of the ink cartridge 1, the porous material 8 in the first chamber 9 and the second chamber 10 are filled with ink without leaving a space, but the ink is consumed by the recording operation. Then, when the ink in the first chamber 9 is exhausted, the air that has entered the second chamber 10 from the first chamber 9 due to the pressure with which the recording head 72 sucks the ink,
A void portion is generated above the chamber 10 and the ink surface is lowered. The ink remaining amount detection sensor 60 is provided in the second chamber 1
The presence or absence of the remaining ink amount is detected from the change in the reflection of light depending on the presence or absence of ink on the inner wall surface of 0.

As shown in FIG. 1, the ink remaining amount sensor 60 emits light to a detection portion α which is set at a predetermined height position of the side wall 2a where the light emitting element 61 faces the second chamber 10 of the case 2. The light emitting element 61 and the light receiving element 62 sandwich the detection site α so that the light receiving element 62 (FIG. 5) can output the reflected light from the inner surface of the side wall at the detection site α. 10 are arranged at a predetermined interval in the horizontal direction. For this purpose, the case 2 may be transparent or semi-transparent so that at least the detection site α portion has a light-transmitting property.

Further, as shown in FIG. 5, the detection portion α is formed by the inner surface of the side wall 2a and the inner surface of the side wall 2d adjacent thereto in the second chamber 10 of the ink cartridge 1 intersecting with each other. It is set on a ridge line portion (corner portion) that extends in the vertical direction. As described above, when the detection portion α is set at the ridge line portion (corner portion) of the second chamber 10, the height of the liquid surface of the ink in the second chamber 10 changes from the level h1 as described later. When the ink L that has adhered to the inner surface of the side wall 2a is held near the level h1 in the central portion of the side wall 2a when the level drops sharply to the level h2, as shown in FIG. The ink L adhering to the vicinity of the portion is at the same level h2 as the height of the ink surface due to the capillary action of the corner portion.
Since it immediately moves to the vicinity, the second
The presence or absence of ink in the chamber 10 can be accurately detected. As described above, the liquid surface drastically drops because the ink liquid surface h2 sways to h1 with the scanning movement of the carriage, and a known suction means is applied to the recording head 72 to recover the ejection function of the recording head 72. This is the case where the ink surface drastically drops by connecting and sucking a large amount of ink.

Further, a rib is provided which projects from the inner surface of the side wall 2a into the second chamber 10 and extends in the height direction of the second chamber 10,
It is possible to set the detection portion α at the ridge portion formed by the rib and the inner surface of the side wall 2a, but as described above, the detection portion α is set at the corner portion that is present in a normal ink cartridge. As a result, the detection accuracy of the ink remaining amount sensor 60 can be increased without complicating the structure of the ink cartridge 1.

Further, as described above, after the ink in the first chamber 9 is almost consumed, the ink remaining amount in the second chamber 10 at which the ink level fluctuation finally appears is detected by the ink remaining amount sensor 60. As a result, the ink remaining amount at the time when the ink cartridge 1 should be replaced can be made as small as possible, and the waste of ink generated when the ink cartridge 1 is replaced can be minimized.

Further, as shown in FIG. 15, on the inner surface of the side wall 2a facing the second chamber 10 in which the detection portion α is set,
A large number of fine uneven lines 63 extending in a direction orthogonal to the plane including the light emitting element 61 and the light receiving element 62 and the detection site α, that is, the vertical direction of the ink cartridge 1 are formed, and the detection site α is set. On the outer surface of the side wall 2a,
A large number of fine concave-convex stripes 64 extending in a direction parallel to the plane including the light emitting element 61 and the light receiving element 62 and the detection site α, that is, the front-rear direction of the ink cartridge 1 are formed.

In the state where the ink is present up to the height of the detection portion α of the second chamber 10, the light emitted from the light emitting element 61 advances into the ink due to the refractive index between the side wall 2a and the ink (arrow B), Almost no progress is made to the light receiving element 62 side. Then, when there is no ink at the detection portion α, the light is reflected by the inner surface of the side wall 2 a and travels toward the light receiving element 62.
At this time, if a large number of fine uneven strips 63 extending vertically are formed on the inner surface of the side wall 2a of the case body 11,
As indicated by the solid line in FIG. 5, when the light emitted from the light emitting element 61 is reflected on the inner surface of the side wall 2a of the case body 11, the unevenness 63 causes the light to travel in a substantially horizontal direction (the light emitting element 61 and the light receiving element 62 and the detection portion). The light is scattered in a direction parallel to a plane including α) and spreads in a plane including the light emitting element 61 and the light receiving element 62 of the sensor 60 and the detection site α of the case 2 and advances toward the light receiving element 62 side. The reflected light when the uneven line 63 is not formed on the inner surface of the side wall 2a is shown by a chain double-dashed line in FIG. Therefore, as shown by the solid line and the chain double-dashed line in FIG. 16, even when the distance between the sensor 60 and the detection site α changes subtly, the light receiving element 62 can reliably receive the reflected light. In other words, even if the mounting position of the sensor 60 with respect to the carriage 52 is varied in the manufacturing stage of the inkjet printer, or the mounting position of the ink cartridge 1 is slightly deviated when the ink cartridge 1 is replaced by the user, the remaining ink amount is surely maintained. Can be detected. In the figure, for convenience of explanation,
Although the light is illustrated as being emitted in parallel from the light emitting element 61, the same effect can be achieved even if the light is emitted so as to spread.

Further, as described above, when a large number of fine uneven strips 64 extending in the front-rear direction are formed on the outer surface of the side wall 2a, as shown in FIG. 17, they are reflected on the outer surface of the side wall 2a of the case 2. The light is scattered in the vertical direction by the concave-convex stripes 64, and the reflected light on the outer surface of the side wall 2a spreads outside the plane including the light emitting element 61 and the light receiving element 62 of the sensor 60 and the detection site α, and the light receiving element 62 side Therefore, it becomes difficult for the light receiving element 62 to receive the reflected light on the outer surface of the side wall 2a that does not contribute to the detection of the remaining ink amount. Therefore, in the reflected light received by the light receiving element 62, the ratio of the reflected light component on the inner surface of the side wall 2a that contributes to the detection of the remaining ink amount becomes high, and the detection accuracy of the remaining ink amount improves. what if,
When the uneven line on the inner surface of the side wall 2a extends in the horizontal direction, light is scattered in the vertical direction. Therefore, as shown in FIG. 16, when the distance between the sensor 60 and the detection site α changes, the light receiving element is detected. The allowable position where 62 can receive the reflected light is significantly limited as compared with the above embodiment.

The case 2 configured as described above is molded by a mold, and the mold used is the detection site α.
The mold surface corresponding to the inner surface of the side wall 2a in which
The mold surface, which is polished in a direction orthogonal to the plane including the light emitting element 61 and the light receiving element 62 and the detection portion α, and corresponds to the outer surface of the side wall 2a where the detection portion α is set, is the light emitting element 61 and It is polished in a direction parallel to a plane including the light receiving element 62 and the detection site α, and by applying such polishing to the mold surfaces, fine uneven lines extending in a predetermined direction are formed on the respective mold surfaces. Many are formed. Therefore, by using such a mold, as described above, a large number of concave-convex strips 63 extending in a predetermined direction are formed on the inner surface and the outer surface of the side wall 2a where the detection site α is set, respectively.
The ink cartridge 1 in which 64 is formed can be easily manufactured.

In this embodiment, the light emitting element 61
Although the light receiving element 62 and the light receiving element 62 are arranged in the horizontal direction, the present invention is not limited to this, and the light emitting element 61 and the light receiving element 62 may be arranged in the vertical direction of the ink cartridge 1. However, in that case, the directions of the uneven lines 63 and 64 formed on the inner and outer surfaces of the side wall 2a must be reversed.

Next, the method of manufacturing the ink cartridge 1 will be described. First, the case 2 is resin-molded, and the case 2 is washed and dried. At this time, since the upper and lower end surfaces of the case 2 are open, the case 2 can be easily molded by a mold that is separated into upper and lower parts. The case needs to be thoroughly cleaned so that the physical properties of the ink do not change, but with the shape of this case, the cleaning liquid can easily reach the inside and can be easily cleaned. Also, the drying can be performed without leaving the cleaning liquid.

Then, as shown in FIG. 4, the porous material 8 is inserted into the first chamber 9 from the upper open end of the case 2, and the porous material 8 is pressed by the upper lid member 3 to be in a compressed state. To accommodate. The upper lid member 3 is heat-welded to the peripheral edge of the upper end opening of the case 2 and the upper ends of the partition walls 5 and 6. Further, the lower lid member 4 includes the lower end opening peripheral edge of the case 2 and the partition walls 7a, 7b,
It is heat-welded and fixed to the lower end of 7c. A sealing material 23 is releasably attached to the ink supply port 17 and the atmosphere communication hole 18 of the lower lid member 4 so as to cover them. In this way, the case 2 is formed to be substantially open at the top and bottom, and by attaching the lid members 3 and 4 to the case from above and below, the various chambers as described above can be formed, and these are easily assembled. Is. Further, since the ink supply port 17 and the atmosphere communication hole 18 are lined up on one surface of the cartridge, it is not necessary to circulate the sealing material 23 that covers them along the outer periphery of the cartridge as in the conventional case, and the sticking can be easily applied. it can.

Further, the operation of filling the ink in the ink cartridge 1 will be described. As shown in FIG. 18, with the ink supply port 17 and the atmosphere communication hole 18 of the lower cover member 4 sealed as described above, the upper cover is closed. The ink filling device 101 is provided in the ink filling port 13 of the member 3, and the pressure reducing device 102 is provided in the depressurizing port 14.
Are brought into close contact with each other and each device is operated. Since the ink filling port 13 and the depressurizing port 14 are lined up on one surface of the cartridge, all the devices may be brought close to each other from one side of the ink cartridge 1. The air in the first chamber 9 is sucked from the pressure reducing port 14 prior to ink filling. As a result, the first and second chambers 9 and 10 are decompressed, and the ink passes from the ink filling port 13 to the second chamber 10 and from the communication hole 15 to the porous material 8 in the first chamber 9. Is filled.
At this time, the second chamber 10 serves as an ink filling path, and the ink enters the second chamber 10 from one end, passes through the communication hole 15 that is farthest from the second chamber 10, enters the first chamber 9, and then the communication hole 15
Since the pressure reducing port 14 is located farthest away from the second chamber 10, the second chamber 10 itself is fully filled with ink, and the first both chambers 9 are
Also, the ink can be efficiently filled. Further, as described above, since the side portions of the case 2 are reinforced by the double wall structure, the case 2 is less likely to be deformed when the pressure is reduced, and in this sense, the efficiency of the two chambers 9 and 10 is improved. Can be well filled with ink. The inside of the atmosphere communication passage 11 is also decompressed at the same time as the first chamber 9, and the decompressed state is maintained even after the sealing material is attached.

As the ink to be filled in the above step, one in which bubbles and air dissolved in the ink are removed as much as possible (so-called deaerated ink) is used. This is to prevent bubbles or air from entering the recording head 72 and causing defective ejection of ink. In addition, the reason why the ink cartridge 1 is vacuum-sealed with the packaging bag 8 as described above is to prevent bubbles and air from being dissolved again in the degassed ink.

After the ink is filled, the seal materials 21 and 22 are attached to the ink filling port 13 and the pressure reducing port 14. Seal material 2
After attaching one sealing material, it is sufficient to leave only the necessary portions of 1 and 22 respectively. In this way, at the manufacturing stage, the filling device 101 and the decompression device 102 may be brought close to the case 2 from one side, and the case 2 may be sealed from one side, so workability is good.

Ink cartridge 1 manufactured in this way
As described above, the product is shipped in a state of being hermetically housed in the packaging bag 81 in a reduced pressure state.

When the user uses the ink cartridge 1, the user peels off the seal material 23 attached to the ink supply port 17 of the ink cartridge 1 and the atmosphere communication hole 18, and the ink supply port 17 is connected to the manifold of the recording head 72. 73 through a joint member 74. Then, as is known, a suction means is connected to the recording head 72, and the recording head 72 is filled with ink from the ink cartridge 1.

During the recording operation, the porous material 8 in the first chamber 9
The negative pressure is applied to the ink supplied from the second chamber 10 to the recording head 72 due to the absorption force of the above, that is, the capillary phenomenon. The actuator of the recording head 72 performs an ink jetting operation to generate a negative pressure in the jetting direction and suck the ink from the ink cartridge 1. When the ink in the second chamber 10 flows out from the ink supply port 17, the ink is replenished from the porous material 8 in the first chamber 9 into the second chamber 10 to remove the ink in the first chamber 9. With consumption, the atmosphere is introduced from the atmosphere communication hole 18 into the first chamber 9 through the atmosphere communication passage 11. Since the upper end of the second chamber 10 is sealed by the sealing material 21, the atmospheric pressure does not work on the ink in the second chamber 10 when the second chamber 10 is fully filled with ink. After the ink in the first chamber 9 is almost consumed, the ink in the second chamber 10 is consumed. That is, when the ink in the first chamber 9 is used up, the pressure with which the recording head 72 sucks the ink causes
As the ink in the second chamber 10 is consumed, air enters the second chamber 10 from the first chamber 9 and a void is generated from the upper portion of the vertical portion 10 of the second chamber 10, so that the ink liquid level is changed. Come down.

In this way, in the first chamber 9, the communication hole 1
Since the atmosphere is introduced from the side remote from 5, the ink in the first chamber 9 is effectively used, and the entire ink including the ink in the second chamber 10 is effectively used. Also,
Since the second chamber 10 is completely filled as an ink filling path from the beginning, there is no erroneous detection in residual amount detection due to insufficient ink filling here. Further sealing material 23
The work of peeling off is also easy because it is only on one side of the cartridge.

In addition, as described above, since the barrier 31 is provided between the communication hole 15 and the ink supply port 17, the pressure of the recording head 72 sucking the ink causes the ink to communicate from the first chamber 9 to the communication hole. When the ink is drawn into the second chamber 10 through 15, air bubbles are mixed in the ink, or the ink in the first chamber 9 is consumed as described above and the air is drawn into the second chamber 10. Then, the bubbles and air can be prevented from flowing into the recording head 72. That is, as shown by the arrow 32 in FIG. 6, when the ink flow bypasses the barrier 31, the air bubbles and the air are directed to the upper portion of the vertical portion 10a by the buoyancy at a position corresponding to the vertical portion 10a of the second chamber 10. Escape, ink supply port 1
It does not reach 7. Since the ceiling surface of the horizontal portion 10b of the second chamber, that is, the lower surface 7d of the bottom partition wall 7 is inclined so as to rise from the lower end of the communication hole 15 toward the vertical portion 10a of the second chamber 10, Bubbles and air do not remain on the lower surface of the bottom partition wall 7, but flow above the vertical portion 10a. Therefore, it is possible to prevent bubbles or air from entering the recording head 72 and causing defective ejection of ink.

[Brief description of drawings]

FIG. 1 is a sectional view of a state in which an ink cartridge according to an embodiment of the present invention is mounted on a recording head.

FIG. 2 is an external view of an ink cartridge.

FIG. 3 is a sectional view of an ink cartridge.

FIG. 4 is an exploded sectional view of an ink cartridge.

5 is a sectional view taken along line BB of FIG.

FIG. 6 is a bottom view of the case without the lower lid member of the ink cartridge.

FIG. 7 is a top view of the upper lid member of the ink cartridge before a sticker is attached.

FIG. 8 is a top view of the upper lid member of the ink cartridge after the sticker is attached.

FIG. 9 is a bottom view of the ink cartridge.

10 is a cross-sectional view taken along the line AA of FIG.

FIG. 11 is an enlarged perspective view showing the structure of a passage 16b portion between the first chamber and the atmosphere communication passage.

FIG. 12 is an enlarged perspective view showing a configuration in which the passage portion of FIG. 11 is improved.

13 is an enlarged perspective view showing a configuration in which the passage portion of FIG. 11 is further improved.

FIG. 14 is a side view of the ink cartridge.

FIG. 15 is a horizontal sectional view conceptually showing the light reflection state at the ink remaining amount detection portion.

FIG. 16 is a horizontal sectional view conceptually showing the light reflection state at the ink remaining amount detection portion.

FIG. 17 is a vertical cross-sectional view conceptually showing the light reflection state at the ink remaining amount detection portion.

FIG. 18 is an explanatory diagram showing an ink filling operation of the ink cartridge.

FIG. 19 is a sectional view of the ink cartridge housed in the packaging bag.

[Explanation of symbols]

1 ... Ink cartridge 2 ... Case 3 ... Top cover member 4 ... Lower lid member 5, 6, 7 ... Partition walls 8 ... Porous material 9 First room 10 ... Second chamber 11 ... Atmosphere communication passage 13 ... Ink filling port 14 ... Decompression port 15 ... Communication hole 16 ... passage 17 ... Ink supply port 18 ... Atmosphere communication hole 21, 22 ... First sealing material 23 ... Second sealing material 29a, 4a ... Ink reservoir 31 ... Barrier 33 ... space 60 ... Ink remaining amount detection sensor 81 ... Packaging bag

   ─────────────────────────────────────────────────── ─── Continued front page    (31) Priority claim number Japanese Patent Application No. 10-94774 (32) Priority date April 7, 1998 (April 4, 1998) (33) Priority claiming country Japan (JP) (31) Priority claim number Japanese Patent Application No. 10-94775 (32) Priority date April 7, 1998 (April 4, 1998) (33) Priority claiming country Japan (JP) (31) Priority claim number Japanese Patent Application No. 10-94776 (32) Priority date April 7, 1998 (April 4, 1998) (33) Priority claiming country Japan (JP) (31) Priority claim number Japanese Patent Application No. 10-94777 (32) Priority date April 7, 1998 (April 4, 1998) (33) Priority claiming country Japan (JP) (31) Priority claim number Japanese Patent Application No. 10-94778 (32) Priority date April 7, 1998 (April 4, 1998) (33) Priority claiming country Japan (JP) (31) Priority claim number Japanese Patent Application No. 10-146993 (32) Priority date May 28, 1998 (May 28, 1998) (33) Priority claiming country Japan (JP) (31) Priority claim number Japanese Patent Application No. 10-166920 (32) Priority date June 15, 1998 (June 15, 1998) (33) Priority claiming country Japan (JP)

Claims (4)

[Claims] 1. An ink cartridge for containing ink to be supplied to a recording head, wherein a first chamber for containing a porous material that has absorbed ink by a partition wall is provided in a case constituting the cartridge.
A second chamber for accommodating ink is formed through a communication hole provided in the lower part of the first chamber, and the second chamber is provided with an ink supply port for supplying ink to the recording head; An ink cartridge, wherein a barrier is provided on a shortest path connecting the communication hole and the ink supply port. 2. The ink cartridge according to claim 1, wherein the second chamber is formed in an open state at one end of the case, and the ink supply port is formed in a lid member covering the open surface, The ink cartridge, wherein the barrier is formed on either one of the lid member and the partition wall facing the lid member. 3. The ink cartridge according to claim 2, wherein the second chamber includes a first portion located below the first chamber, a side of the first chamber, and a side wall of the case. An ink cartridge, comprising: a second portion located between the first and second portions, the communication hole opening to the first portion, and the barrier located at the first portion. 4. The ink cartridge according to claim 3, wherein in the partition wall between the first and second chambers, a portion that constitutes a ceiling surface of the first portion of the second chamber is the second The ink cartridge is characterized in that it is inclined so as to rise toward the portion.