JP3201053B2 - Inkjet cartridge - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ink jet cartridge for connecting an ink jet head and an ink tank to each other through a joint member, and more particularly, to improving the ink supply performance by devising the joint member. The invention relates to an ink jet cartridge.

[0002]

2. Description of the Related Art As a conventional ink jet cartridge, there is known an ink jet cartridge in which an ink jet head and an ink tank are connected to each other through a joint member. In such a type, in order to prevent a situation in which foreign matter such as dust in the ink or agglomerated particles adhere to the fine nozzle portion flow path of the ink jet head and cause a non-ejection phenomenon of the ink, the normal ink supply flow path is used. A foreign matter removing means such as a filter is provided therein. As this type of filter structure, for example, a filter is provided at the tank opening of the ink tank, a cylindrical member closed with a rubber stopper is installed under the filter, and the rubber stopper is replaced with a hollow needle on the inkjet head side. The ink is supplied to the ink jet head by penetrating the ink jet head.
No. 153146), and a filter in which a filter is provided at the tip of a needle-shaped connector on the side of an ink jet head so as to be joined to a tank opening of an ink tank (Japanese Patent Laid-Open No. 2-194)
No. 969) is known.

[0003]

By the way, in the former type, when ink is initially filled into the ink jet head through the hollow needle, air remains in the cylindrical member closed by the rubber stopper. If the residual air becomes bubbles and moves toward the ink jet head, there arises a technical problem that the ink ejection operation is hindered and print quality is reduced. In the latter type, since the area in the cross section of the needle-shaped connector becomes the opening area of the filter, the opening area of the filter is inevitably narrowed, and the pressure loss of the ink in the filter section becomes extremely large. Will increase. In this case, the filling property of the ink into the nozzle portion is likely to be impaired, which leads to a reduction in the amount of ink ejected. Therefore, there is a technical problem that the ink ejection operation of the inkjet head becomes unstable. In particular, the above-described technical problem has been remarkable because the head pressure corresponding to the height difference of the ink in the ink tank is added as the negative pressure increases as the remaining amount of ink in the ink tank decreases.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned technical problems, and it is an object of the present invention to effectively prevent clogging of a nozzle portion of an ink-jet head due to foreign matter and the like while discharging ink from the ink-jet head. An object of the present invention is to provide an ink jet cartridge capable of stabilizing the operation.

[0005]

That is, the present invention provides:
As shown in FIG. 1, an ink tank 1 filled with ink 2 and having an ink supply tank opening 1a,
An ink-jet head 3 for discharging the supplied ink 2 in accordance with image information; a joint member 4 for connecting the ink tank 1 and the ink-jet head 3 to each other so as to supply the ink 2 from the ink tank 1 to the ink-jet head 3; In the ink jet cartridge provided with, the joint member 4 has an ink circulation tubular body 5 that is connected to and connected to the tank opening 1a of the ink tank 1;
A dust removing filter 6 is provided at the opening end of the cylindrical body 5, and a funnel-shaped ink flow path 7 having a throttle angle of about 25 ° to 50 ° is formed in the cylindrical body 5 immediately after the dust removing filter 6. It is characterized by having been done.

In such technical means, the ink tank 1 may be one in which an ink absorber impregnated with ink is built in and an air communication port is provided, or a negative pressure space exists inside. In this case, only the ink may be filled. In addition, the structure of the inkjet head 3, the ink ejection method, and the like may be appropriately selected.

The joint member 4 may be fixedly provided in advance as long as it connects the ink jet head 3 and the ink tank 1 in communication, or the joint member 4 may be provided on the ink jet head 3 side. It may be fixed so as to be detachably attached to the ink tank 1. Further, the dust removal filter 6 only needs to have a filtering accuracy enough to remove foreign substances contained in the ink 2. If the filtering accuracy is approximately 20 μm or less in relation to the nozzle flow path diameter, Good. The specific form of the dust removal filter 6 may be appropriately selected, but is preferably made of an internal collection type SUS sintered body. Furthermore, the funnel-shaped ink flow path 7 may have a longitudinal sectional shape that changes linearly, but from the viewpoint of further reducing pressure loss,
It is preferable that the tangential direction of the vertical cross-sectional shape gradually changes toward the axial direction of the cylindrical body 5 as the distance from the dust removing filter 6 increases. In particular, the throttle angle when the funnel-shaped ink flow path 7 is curved is defined by the throttle angle when the curved funnel-shaped ink flow path 7 is linearly approximated. In addition, the throttle angle of the funnel-shaped ink flow path 7 means the angle of inclination of the funnel-shaped ink flow path 7 with respect to the axial direction of the cylindrical body 5 and may be about 25 ° to 50 °. Here, the upper limit of the aperture angle is considered to be that if the aperture angle is increased to a degree exceeding 50 °, the space volume below the periphery of the dust removal filter 6 is reduced, and the effective filtration area is excessively reduced. The lower limit of the aperture angle is that when the aperture angle is less than about 25 °, the volume of space under the periphery of the dust removal filter 6 increases, and air is entrapped at the time of initial filling of ink, and bubbles are formed under the dust removal filter 6. This is in consideration of the fact that it is likely to remain.

[0008]

According to the technical means described above, the ink 2 in the ink tank 1 is supplied to the ink jet head 3 via the joint member 4. At this time, since the ink 2 passes through the dust removal filter 6 located at the opening end of the cylindrical body 5 of the joint member 4, foreign matter such as dust in the ink 2, aggregated particles, or bubbles generated in the ink tank 1 are generated. Removed. If the total volume of the ink flow passage in the joint member 4 is increased, the amount of priming ink is increased in, for example, a discharge ink priming operation, and air bubbles are likely to remain in the joint member 4. It is not preferable to make the overall volume of the ink flow passage of the member 4 unnecessarily large. Under such conditions, since the dust removal filter 6 is located at the open end of the tubular body 5 of the joint member 4,
If only the opening end of the dust removing filter 6 is secured wide, the effective opening area of the dust removal filter 6 can be secured widely without unnecessarily increasing the overall volume of the ink flow passage in the joint member 4. As a result, the pressure loss of the ink 2 at the dust removing filter 6 can be reduced. Also,
The cylindrical body 5 immediately after the dust removal filter 6 of the joint member 4
Inside, a funnel-shaped ink flow path 7 having a throttle angle of about 25 ° to 50 ° is formed, so that the space volume around the dust removal filter 6 becomes too small, and the substantial filtration area of the dust removal filter 6 is reduced. In addition, the space volume around the dust removal filter 6 becomes too large,
The ink 2 that has passed through the dust removal filter 6 at the time of the initial filling or the like does not entrain air. Therefore, the ink 2 that has passed through the dust removal filter 6 is smoothly supplied to the inkjet head 3 side with a small pressure loss without being separated along the funnel-shaped ink flow passage 7.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the embodiments shown in the accompanying drawings. FIG. 2 shows an embodiment showing an overall configuration of an ink jet cartridge used in a color printer to which the present invention is applied. In the figure, an ink-jet cartridge 30 of each color component is constituted by an ink tank 40 filled with ink and an ink-jet head 50 to which the ink tank 40 is detachably mounted, and is detachably mounted on a scanning carriage 31. It is supposed to be. In this embodiment, the scanning carriage 31 slides and supports both sides in the width direction orthogonal to the main scanning direction with a pair of guide rods 32 and 33. Ink-jet cartridge 3 that has two housing recesses 34 and is housed on both sides in the width direction of each housing recess 34.
Positioning walls 35 and 36 are provided for restricting the position in the width direction of 0. Then, this scanning carriage 31
Is configured to appropriately move and scan along the main scanning direction in accordance with a print instruction from a console panel (not shown), and eject ink droplets from the inkjet head 50 in accordance with image information.

FIG. 3 shows details of the ink tank 40 used in this embodiment. In the figure, the ink tank 40 has a substantially hollow rectangular parallelepiped shape, and is composed of a box body 401 having one side opened and a side lid 402 for closing one side of the box body 401. Each of them is molded with an ink-resistant material, for example, a polyester resin. In the ink tank 40, an ink absorber 41 having a pentagonal vertical cross section corresponding to the vertical cross section of the ink tank 40 is built in. The ink absorber 41 in this embodiment has a density of, for example, 800 g.
/ M ³ of polyester felt and sufficiently impregnated with a predetermined color ink (in this embodiment, the ink capacity is about 35 to 37 cc when the volume of the ink absorber 41 is 43 cc).

Also, the bottom wall 404 of the ink tank 40
Has a circular tank opening 42, while one end of an upper wall 405 of the ink tank 40 has a bulging portion 406.
A very small diameter atmospheric pressure communication port 43 communicating with the inside of the ink tank 40 is opened at the center of the bulging portion 406. Reference numeral 407 denotes a sealing tape for sealing the atmospheric pressure communication port 43 when the ink tank 40 is not used.
Reference numeral 8 denotes a tank grip formed on the upper wall 405 of the ink tank 40.

Further, the tank opening 42 is sealed with a rectangular heat-fusible film 44 made of a non-ink-permeable material. In this embodiment, the heat-fusible film 44 has a thickness of about 70 to 120 μm made of, for example, a multilayer laminate material of aluminum foil and polyethylene, and is adhered to the outer peripheral surface of the tank opening 42 by heat fusion. You.

Further, in this embodiment, a cylindrical portion 45 is formed on the inner peripheral edge of the tank opening 42, and the cylindrical portion 45 is approximately 4 mm inward of the ink tank 40. The outer peripheral surface and the inner peripheral surface of the protrusion protrude toward the bottom wall 404 of the ink tank 40 in a divergent shape. Further, a concave portion 46 which is depressed inward of the ink tank 40 is formed on the outer peripheral edge of the tank opening 42.

In this embodiment, a small number of minute projections 410 are formed on the inner surfaces of both side walls of the ink tank 40 so as to bite into the ink absorber 41, thereby displacing the ink absorber 41 in the vertical direction. Is to be prevented. Further, a plurality of ribs 411 are opposed to each other in a state of being spaced apart from each other at the upper part of the inner surface of both side walls of the ink tank 40. , And the atmosphere from the atmospheric pressure communication port 43 uniformly acts on the upper surface of the ink absorber 41. Reference numeral 412 is formed on the outer surface of the side wall of the ink tank 40, and is engaged with a locking hole 534 of the tank holding case 53 when inserted and locked in the tank holding case 53 of the ink jet head 50 described later. It is.

FIG. 4 shows the details of the ink jet head 50 used in this embodiment. In the figure, an ink jet head 50 includes a head body 51 from which supplied ink is ejected in accordance with image information, a heat sink 52 for releasing heat generated from the head body 51, and an ink tank attached to the heat sink 52. A tank holding case 53 for detachably holding the tank 40, and an electric board 54 provided on the heat sink 52 for supplying image information taken in from the electric connector 551 to the head main body 51 side.

In this embodiment, the head main body 51 has 128 nozzles communicating with the common ink chamber at 300 spi.
Each nozzle is provided with a heating element that generates heat when energized, and the heat from the heating element causes bubbles to grow and eject ink droplets. The tank holding case 53 is formed by joining left and right divided case members 531 and 532, and an elastic pressing piece for pressing the inserted ink tank 40 is provided substantially at the center of the case members 531 and 532. An elastically deformable cut piece 533 is formed in the upper center of the case members 531 and 532, and when the ink tank 40 is inserted and held in the cut piece 533, the locking projection 412 of the ink tank 40 is provided. A locking hole 534 for locking the hole is formed.

In this embodiment, the ink tank 40 held in the tank holding case 53 and the head body 5
1 is communicatively connected by a joint member 55. The joint member 55 includes an ink supply pipe 60 inserted and connected to the tank opening 42 of the ink tank 40, and a manifold 70 that communicates the ink supply pipe 60 with the head main body 51. The ink supply pipe 60 is
In particular, as shown in FIGS. 5 to 7, the cylindrical tube portion 61, a flange portion 62 protruding in the radial direction on the base side of the cylindrical tube portion 61, and the root of the cylindrical tube portion 61 of the flange portion 62 An O-ring locking groove 63 formed in the portion to lock the O-ring 68; a sharp protrusion 64 protruding from the tip of the cylindrical tube portion 61 at, for example, four equal angular intervals; And a rib 65 extending along the outer peripheral surface of the cylindrical tube portion 61. In particular, in this embodiment, the projection 64 has an inclined edge 64a extending outward from the inner peripheral surface position of the cylindrical tube portion 61, and has a sharp end 64a.
b is disposed at the outer peripheral surface position of the cylindrical tube portion 61,
The rib 65 has a mountain shape whose height gradually increases toward the base of the cylindrical tube portion 61. Further, in this embodiment, for example, SU
A dust removal filter 66 made of S mesh is mounted. The dust removal filter 66 has a thickness of, for example, 0.9 mm, and is press-fitted into a receiving groove 61a formed in the inner peripheral edge of the tip of the cylindrical tube portion 61. The tip surface of the dust removal filter 66 is a cylindrical tube. The portion 61 is arranged so as to protrude slightly by k (0.4 mm in this embodiment) from the general end face. Further, a funnel-shaped ink flow passage 611 having a throttle angle α of about 30 ° to 45 ° is formed in the cylindrical tube portion 61 immediately after the dust removal filter 66, as shown in FIG. An ink flow passage 612 having a circular uniform cross section is formed through 611. still,
In this embodiment, the funnel-shaped ink flow passage 611 is used.
Has an entrance side opening diameter of 5 mm.

On the other hand, as shown in FIGS. 5 to 7, the manifold 70 is formed integrally with a polyetherimide resin, for example.
And a connecting portion 71 inserted and connected through the connecting portion 7. An ink supply line 72 having a small diameter is provided from the connecting portion 71.
1 to form a long liquid chamber 73 extending along the length direction;
A slit opening 74 is opened in a region facing the bottom of the liquid chamber 73. Reference numeral 75 denotes a manifold 70
Is a positioning boss for positioning and fixing the heat sink 52 to the heat sink 52. In this embodiment, the liquid chamber 73 is used.
Has a wall surface 731 (having an angle of 25 ° to 45 ° in the present embodiment with respect to the horizontal direction) that gradually expands downward from the position of the communication portion with the ink supply pipeline 72 toward the lower side. The ink that has entered the liquid chamber 73 from the supply pipe 72 is immediately filled into the liquid chamber 73. The slit opening 74 of the manifold 70
A plurality of communication holes 523 are opened in the head main body 51 corresponding to the above, so that ink from the liquid chamber 73 of the manifold 70 is uniformly supplied to a common ink chamber (not shown) of the head main body 51. .

Next, the operation of replacing the ink tank with the ink jet cartridge according to this embodiment will be described. When replacing the ink tank 40, as shown in FIG. 8, the ink tank 40 is taken out of the package, and the tank holding case 53 of the ink jet head 50 is left as it is.
Plug in. At this time, as shown in FIG. 9, the protrusion 64 of the ink supply pipe 60 is
Although abuts against the heat-welding film 44 blocking the 2, the protruding portions 64 begin to break the heat-fusible film 44, when the ink supply tube 60 is gradually inserted into the tank opening 42, ink The ribs 65 formed on the outer peripheral portion of the supply pipe 60 positively push away the broken portion of the heat-fusible film 44 to the periphery, and the broken portion of the heat-fusible film 44 is torn off to open the opening of the ink supply tube 60. Avoid blocking situations. In this state,
The ink supply pipe 60 is inserted and coupled to the tank opening 42, and the general end surface of the cylindrical pipe part 61 of the ink supply pipe 60 is slightly smaller than the cylindrical part 45 of the ink tank 40 (in this embodiment, m (see FIG. 10)). = Approximately 4 mm). Then, as shown in FIG.
The projections 64 of the first and second ink cartridges are immersed in the ink absorber 41 to mechanically connect the ink supply pipe 60 and the ink absorber 41, and the surface of the dust removal filter 66 press-fitted into the tip of the cylindrical pipe section 61 has the ink. By pressing against the absorber 41, fluid connection between the ink supply pipe 60 and the ink absorber 41 is achieved.
An O-ring 68 is locked in the O-ring locking groove 63 of the ink supply pipe 60, and the ink supply pipe 60 is
The O-ring 68 is disposed between the flange 62 of the ink supply pipe 60 and the recess 46 of the ink tank 40 to prevent the ink from leaking from the inside of the ink tank 40. It has become. Thereafter, the nozzle 526 side of the head main body 51 is forcibly brought into a negative pressure state by a negative pressure generator (not shown) provided on the printer main body side, and from the ink absorber 41 to the common ink chamber (not shown) of the head main body 51 When the ink is filled, the preparation for the ink discharging operation is completed. Therefore, the inkjet head 5
When the ink ejection operation is performed on the 0 side, the head body 51
The common ink chamber on the side is in a negative pressure state, and along with this, ink from the ink absorber 41 of the ink tank 40 is discharged by a capillary phenomenon through the joint member 55 composed of the ink supply pipe 60 and the manifold 70 to the head main body 51. It is supplied to a common ink chamber.

In this embodiment, as shown in FIG. 10, the ink supply pipe 6 immediately after the dust removal filter 66 is used.
Within 0, the aperture angle α (30 ° to 45 ° in this embodiment)
The funnel-shaped ink flow path 611 is formed. The relationship between the change in the throttle angle α of the funnel-shaped ink flow path 611, the pressure loss (in the case of solid printing), and the presence or absence of air bubbles was examined. The results shown in Table 1 were obtained.

[0021]

[Table 1]

According to Table 1, when the throttle angle α is 45 °, the pressure loss of the joint member 55 is not so large. However, when the throttle angle α exceeds 50 °, the pressure loss of the joint member 55 decreases. It was confirmed to rise extremely. It is considered that this is mainly due to the fact that the larger the aperture angle α, the smaller the space volume below the periphery of the dust removal filter 66 and the smaller the effective filtration area. When the aperture angle α was 30 °, no phenomenon that bubbles remained when the ink was initially filled was observed. However, when the aperture angle α was less than 25 °, the space volume below the periphery of the dust removal filter 66 was reduced. When air is initially filled with ink, air is entrapped and air bubbles tend to remain under the dust removal filter 66. When the air bubbles descend to the ink jet head 50 during printing, image defects such as white spots may occur. It was confirmed that it led to. A similar experiment was carried out while changing the substantial opening diameter of the dust removal filter 66, and the same result as described above was obtained. Therefore,
It is supported that the optimal range of the aperture angle α is 25 ° <α <50 °, and in this embodiment, 30 ° to 45 ° is selected.

Further, the ink pressure in the ink jet head 50 after the initial filling of the ink is set within a range in which the ink does not flow out naturally from the nozzle portion. In this embodiment, it is set to -30 mmH2O. Since the fluctuation of the ink pressure affects the ejection characteristics of the ink from the nozzles of the inkjet head 50,
When the variation of the ink pressure with respect to the remaining amount of the ink in the ink tank 40 was examined, the result as shown in FIG. 11 was obtained.

In FIG. 11, the solid line shows the fluctuation of the ink pressure (static pressure + dynamic pressure) of the ink jet head according to the embodiment, and the one-dot chain line shows the comparative example (using the same ink tank as in the embodiment, the conventional hollow needle). Joint [inner diameter: 2.5mm]
Of the ink jet head (static pressure + dynamic pressure) of the ink jet head according to the present invention and a filter using a sintered stainless steel filter), and the dotted line indicates the ink static pressure. Here, the static ink pressure is an ink pressure when printing is not performed, and is generated by a pressure at which a capillary force of the ink absorber 41 in the ink tank 40 is generated and a head pressure of the ink from the surface of the ink jet head 50. The ink dynamic pressure is considered to be a pressure loss generated by the ink flow rate and the fluid resistance of the flow path system. According to FIG. 11, there is no difference in the static ink pressure between the embodiment and the comparative example. However, the dynamic pressure of the ink in the comparative example has a larger fluctuation range of the negative pressure value than that in the embodiment. Pretty big. Specifically, in the comparative example, the ink pressure of the inkjet head 50 already exceeded the negative pressure value of 150 mmH2O when the remaining amount of the ink slightly decreased,
It has been confirmed that an increase in the negative pressure value equal to or greater than this value impairs the ink filling property, causes a decrease in the ink discharge amount, and causes a decrease in print image quality called blur. This is because in the comparative example, the dust removal filter 66 contributes to the filtration.
It is thought that this is due to the fact that the substantial open filtration area has become about 1/4. On the other hand, in the embodiment, the ink pressure is kept in an appropriate range with respect to the change in the remaining amount of ink, and good print quality is confirmed.

The specific configuration of the ink supply pipe 60 is not limited to the one shown in the above embodiment. For example, as shown in FIG. As the distance from the position of the filter 66 increases, the tangential direction of the vertical cross-section gradually increases.
It may be designed to have a curved surface that changes in one axial direction. In this modification, a funnel-shaped ink flow passage 16 is provided.
1 is a first funnel-shaped ink flow passage 1 having a radius of curvature of 5 mm.
61a and a second funnel-shaped ink flow path 161b having a radius of curvature of 10 mm are smoothly connected. In this modification, the substantial opening diameter A of the dust removal filter 66 is 5 mm, and the diameter of the ink passage 162 having the same diameter leading to the funnel-shaped ink passage 161 is 2 mm. In this modification, a funnel-shaped ink flow passage 16 is provided.
By making the shape of 1 a curved surface, the shape resistance to the ink is further reduced, the pressure loss is further reduced, the separation of the ink from the funnel-shaped ink flow passage 161 is further suppressed, and the occurrence of the air entrainment phenomenon is reduced. It is possible to prevent. Further, as shown in this modified example, the protrusions 64 and the ribs 65 as in the embodiment need not be formed in the ink supply tube 60.

[0026]

As described above, claims 1 to 3 are described.
According to any one of the aspects of the invention, the dust removing filter is provided at the opening end of the joint member, and the shape of the ink flow path in the joint member below the periphery of the dust removing filter is devised, so that the nozzle portion of the inkjet head can be connected to the nozzle portion. Not only can dust clogging be effectively prevented, but the pressure loss inside the joint member can be reduced while maintaining the substantial filtration area of the dust removal filter sufficiently, and the phenomenon of air bubbles remaining. Can be stably supplied while effectively avoiding the problem.

In particular, according to the second aspect of the invention, the shape resistance of the funnel-shaped ink flow passage of the joint member is further reduced, and the peeling of the ink from the wall surface is further suppressed, so that the pressure loss of the ink is reduced. It is possible to more reliably avoid the phenomenon of bubbles remaining due to entrainment of air, while further reducing the amount of air bubbles. Furthermore, according to the third aspect of the present invention, it is possible to maintain good ink supply properties even for an ink jet cartridge in which the ink tank is a cartridge type.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing a configuration of an ink jet cartridge according to the present invention.

FIG. 2 is an exploded perspective view showing the entire configuration of the ink jet cartridge according to the embodiment.

FIG. 3 is an exploded perspective view illustrating details of an ink tank used in the embodiment.

FIG. 4 is an exploded perspective view showing details of an inkjet head according to the embodiment.

FIG. 5 is an explanatory diagram illustrating a relationship between a head body and a joint member of the inkjet head according to the embodiment.

FIG. 6 is an exploded perspective view illustrating details of a joint member according to the embodiment.

FIG. 7 is an explanatory sectional view of the same.

FIG. 8 is an explanatory diagram illustrating a state before the ink tank is replaced in the inkjet cartridge according to the embodiment.

FIG. 9 is an explanatory diagram illustrating a state of the ink jet cartridge according to the embodiment after ink tank replacement.

FIG. 10 is an enlarged view of a portion X in FIG. 9;

FIG. 11 is a graph showing the relationship between the ink pressure of the nozzle portion of the inkjet head and the remaining amount of ink according to the embodiment.

FIG. 12 is an explanatory diagram showing a modification of the ink supply pipe according to the embodiment.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Ink tank, 1a ... Tank opening, 2 ... Ink, 3
... Inkjet head, 4 ... Joint member, 5 ... Cylindrical body, 6 ... Dust removal filter, 7 ... Funnel-shaped ink flow passage

Claims (3)

(57) [Claims] An ink tank (1) filled with ink (2) and having an ink supply tank opening (1a), and an ink jet head (3) for discharging the supplied ink according to image information. ) And a joint member (4) that connects the ink tank (1) and the inkjet head (3) in communication with each other and supplies ink from the ink tank (1) to the inkjet head (3). The joint member (4) is connected to the tank opening (1a) of the ink tank (1).
A cylindrical body (5) for ink distribution connected to and connected to
A filter (6) for removing dust is provided at the open end of the tubular body (5).
And a funnel-shaped ink passage (7) having a throttle angle of about 25 ° to 50 ° is formed in the cylindrical body (5) immediately after the dust removing filter (6). Inkjet cartridge. 2. The cylindrical funnel (5) according to claim 1, wherein the funnel-shaped ink flow passage (7) has a tangential direction of a vertical cross-sectional shape gradually as the distance from the position of the dust removing filter (6) increases. An ink jet cartridge having a curved surface that changes in the axial direction. 3. The ink-jet cartridge according to claim 1, wherein the joint member is fixed to the ink-jet head and is detachably mounted on the ink tank. .