JPH09174846A - Ink jet head, ink jet cartridge and ink jet apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it possible to manufacture a low-cost ink jet head in which a common ink chamber is connected to an ink supply tube via a communicating passage. SOLUTION: This ink jet head 11 comprises a plurality of ink passages 29 formed at one end side with ink discharge ports 24 each for discharging ink, discharge energy generating elements disposed at the passages 29 to discharge the ink from the ports 21, a common ink chamber 30 communicating with the other end side of the passage 29, an ink supply tube 27 disposed along the chamber 30 to be supplied with the ink, and a plurality of communicating passages 28 for communicating the tube 27 with the chamber 30. In this case, the total passage sectional area of the passage 28 is set to larger total sum of the passage sectional area of the passage 29.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ink jet head for ejecting ink from an ink ejection port, an ink jet cartridge incorporating the ink jet head, and an ink jet device equipped with the ink jet cartridge. It is suitable for application to a full line type that is arranged over the entire width of.

[0002]

BACKGROUND ART Various printing devices such as printers, copiers, and facsimiles store the above-mentioned character information and image information on the surface of various print media such as paper, plastic thin plates, or cloth based on the character information and image information. It is configured to print corresponding characters and images.

Such a printing apparatus has an ink jet method, a wire dot method,
It can be divided into a thermal method and an electrophotographic method. Among them, the inkjet method is configured to perform printing by ejecting ink droplets from an ink ejection port of an inkjet head and adhering the ink droplets to a print medium, which enables high-speed printing with low noise. In addition, since there is no particular limitation on the print medium and color images can be printed easily, it has been widely used in recent years.

Above all, heat energy is applied to the ink,
The ink jet head of the bubble jet method, which ejects ink droplets by utilizing the pressure of thermal expansion, has a relatively simple structure, has good responsiveness to print signals, and can achieve high speed relatively easily. It has many advantages such as high density of the ink ejection ports.

As a full line type of the ink jet head which is elongated, a common ink chamber is formed at the other end of the ink passage whose one end serves as an ink ejection port.
It is proposed that an ink supply pipe arranged along the common ink chamber and the common ink chamber are connected via a plurality of communication passages. However, this inkjet head has an ink supply pipe having a mechanically high rigidity. It has an advantage that it can be used as a supporting member of an inkjet head.

[0006]

In a conventional ink jet head in which a common ink chamber and an ink supply pipe are connected via a communication passage, a portion of the ink supply pipe facing the common ink chamber extends along the longitudinal direction thereof. It is necessary to form grooves and a large number of holes and use these as communication passages. For example,
A full-line type inkjet head compatible with A4 size print media has grooves and a large number of holes (specifically, a total of 24 at 9 mm intervals) over a length of about 210 mm.
Individual) must be formed. As for the width of these grooves and the diameter of the holes, empirically, a fine end mill or drill having a diameter of less than 1 mm is used, and in the case of holes, they are drilled at intervals of about 9 mm, for example.

Generally, it can be said that drilling using a drill is superior in machining efficiency to grooving using an end mill, but in any case, an end mill is used to form a long groove having an extremely narrow width. Forming a hole in the ink supply pipe or forming dozens of holes in the ink supply pipe by using a drill increases the manufacturing cost because the time required for processing increases. It was an obstacle to the conversion.

[0008]

SUMMARY OF THE INVENTION It is a first object of the present invention to provide an ink jet head which can be manufactured at a lower cost than before and which connects a common ink chamber and an ink supply pipe via a communication passage. is there.

A second object of the present invention is to provide an ink jet cartridge equipped with such an ink jet head.

Further, a third object of the present invention is to provide an ink jet device in which such an ink jet cartridge is incorporated.

[0011]

According to a first aspect of the present invention, a plurality of ink passages each having an ink ejection port for ejecting ink formed at one end side, and the ink ejection ports disposed in these ink passages, respectively, are provided. An ejection energy generating element for ejecting ink from the outlet, a common ink chamber communicating with the other end of the ink passage, an ink supply pipe arranged along the common ink chamber to supply ink, An ink jet system, comprising: an ink supply pipe and a plurality of communication passages communicating with the common ink chamber, wherein the sum of the passage cross-sectional areas of the communication passages is set to be larger than the sum of the passage cross-sectional areas of the ink passages. On the head.

According to a second aspect of the present invention, a plurality of ink passages each having an ink ejection port for ejecting ink formed at one end side, and inks are ejected from the ink ejection ports respectively disposed in the ink passages. A discharge energy generating element for discharging, a common ink chamber communicating with the other end side of the ink passage, an ink supply pipe arranged along the common ink chamber to supply ink, and the ink supply pipe. An ink jet head having a plurality of communication passages communicating with the common ink chamber and an ink tank for storing ink to be supplied to the ink jet head are provided, and a sum of passage sectional areas of the communication passages in the ink passages. The inkjet cartridge is characterized in that it is set to be larger than the total of the passage cross-sectional areas.

Further, according to a third aspect of the present invention, a plurality of ink passages each having an ink ejection port for ejecting ink formed on one end side, and inks are ejected from the ink ejection ports respectively disposed in the ink passages. A discharge energy generating element for discharging, a common ink chamber communicating with the other end side of the ink passage, an ink supply pipe arranged along the common ink chamber to supply ink, and the ink supply pipe. An ink jet device using an ink jet cartridge having an ink jet head having a plurality of communication passages communicating with the common ink chamber, and an ink tank for storing ink to be supplied to the ink jet head, the ink jet device comprising: The sum of the passage cross-sectional areas is set to be larger than the sum of the passage cross-sectional areas in the ink passage. In that the ink jet apparatus.

According to the present invention, the sum of the passage cross-sectional areas of the communicating passages for guiding the ink from the ink supply pipe to the common ink chamber is set larger than the sum of the passage cross-sectional areas of the ink passages. Even when the ink is continuously ejected from the ink ejection port, the ink is smoothly supplied from the ink supply pipe to the common ink chamber side at a rate commensurate with the consumption of the ink.

That is, even if the number of communicating passages is set to be small in order to reduce the manufacturing cost, the ink can be smoothly supplied from the ink supply pipe to the common ink chamber side by setting the passage cross-sectional area accordingly. Will be secured.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION In an ink jet head according to the present invention, a plurality of ink passages each having an ink ejection port for ejecting ink are formed on one end side, and ink is ejected from the ink ejection ports respectively arranged in these ink passages. A discharge energy generating element, for example, an electrothermal converting element, a common ink chamber communicating with the other end of the ink passage, an ink supply pipe arranged along the common ink chamber to supply ink, The ink passage includes a plurality of communication passages that communicate the ink supply pipe and the common ink chamber, and further includes an element substrate on which a discharge energy generating element is provided, and a passage forming member having a plurality of grooves, and the ink passage is It may be formed between the element substrate and the groove of the passage forming member that is superposed on the element substrate.

That is, a plurality of ink passages are formed by joining the element substrate and the passage forming member so that the ejection energy generating element of the element substrate and the groove of the passage forming member face each other. The ejection energy generating element for ejecting ink from the ink ejection port formed at one end of the passage faces each ink passage.

In this case, a plurality of element substrates may be joined to one passage forming member.

The ink supply pipe may be incorporated in the passage forming member, and a part of the ink supply pipe may face the common ink chamber formed between the element substrate and the passage forming member.

Further, it is desirable that the communication passage is formed in the ink supply pipe facing the common ink chamber.

In the ink jet cartridge and the ink jet apparatus of the present invention, the minimum passage sectional area in the ink passage from the ink tank to the ink supply pipe is set larger than the sum of the passage sectional areas of the communicating passages. Is effective.

[0022]

EXAMPLE An example of an ink jet head according to the present invention will be described in detail with reference to FIGS.

As shown in FIG. 1 showing the disassembled state of the ink jet head in this embodiment, FIG. 2 showing the cross sectional structure thereof, and FIG. 3 showing the enlarged cross sectional view taken along the line III-III thereof, the ink jet head 11 of this embodiment is shown. Is a base plate 12 made of metal or ceramics,
A plurality of heater boards 13 stacked on the base plate 12, a nozzle block 14 stacked on the front end side of the heater boards 13, and a heater board 13.
The main part is composed of the wiring board 15 and the wiring board 15 which are superposed on the rear end side.

As shown in FIGS. 1 to 3 and FIG. 4 in which the joint portion between the base plate 12 and the heater board 13 is extracted and enlarged, each heater board 13 as an element substrate of the present invention.
Heat generating resistors 16 as ejection energy generating elements of the present invention are formed at predetermined intervals P on the upper surface of the front end of each of the heater boards 13 and electrode pads 17 electrically connected to the heat generating resistors 16 respectively. They are formed on the upper surface of the rear end portion at predetermined intervals. Each heater board 13
Are bonded to the base plate 12 via an adhesive 18 having a predetermined thickness, and the intervals between the heater boards 13 adjacent to each other are also determined by the heating resistors 16 located at the side ends of the heater boards 13. The interval is set to be the above predetermined interval P. A sealant 19 for preventing ink from leaking to the base plate 12 side is filled between the adjacent heater boards 13.

If there is no risk of ink leaking from the gap between the adjacent heater boards 13, it is not necessary to use the above-mentioned sealing material 19. In this embodiment, 1
A heater board 13 is used in which 28 heating resistors 16 are formed at intervals P of 70.5 μm corresponding to a density of 360 dpi.

On the front end joint surface of the wiring board 15, electrode pads 20 are formed so as to project from the upper surface of the rear end of the heater board 13 at intervals corresponding to the electrode pads 17, and these electrode pads 17, 20 are electrically connected. So as to be electrically connected, the front end joint surface of the wiring board 15 and the rear end upper surface of the heater board 13 are superposed in a positioned state and integrally joined with the base plate 12 via an adhesive (not shown). Instead of the adhesive, the heater board 13 and the wiring board 15 may be integrally connected with the base plate 12 by fastening means such as machine screws. The electrode pad 20 of the wiring board 15 is connected to a connector 21 provided at the center of the rear end of the wiring board 15, and the on / off control of the energization of each heating resistor 16 is controlled via the connector 21. No Connect to control device.

FIG. 5 showing the front shape of the nozzle block 14.
As shown in FIG. 6 and FIG. 7 showing the bottom surface shape and the top surface shape thereof, respectively, on the ejection port surface 22 side of the nozzle block 14, a positioning flange portion 23 that abuts on the front end surfaces of the base plate 12 and the heater board 13. Is provided, and the groove 2 having a trapezoidal cross section is formed by penetrating the flange portion 23 and opening one end on the ejection port surface 22 as the ink ejection port 24.
5 are engraved on the front end joint surface at the predetermined interval P.
The other ends of the grooves 25 having the trapezoidal cross section have the nozzle block 14
The recessed portion 26 formed along the longitudinal direction of the rear joint surface
The outer peripheral surface of the ink supply pipe 27 embedded in the nozzle block 14 faces the recess 26. Further, three communication passages 28 communicating with the inside of the ink supply pipe 27 are formed on the outer peripheral surface of the ink supply pipe 27 located at the center portion and the left and right end portions of the recess portion 26.

At both ends of a cylindrical ink supply pipe 27 that penetrates the nozzle block 14 along the longitudinal direction of the rectangular rod-shaped nozzle block 14, an ink tank (not shown) for storing ink is provided through pipes (not shown). The ink in the ink tank is connected to the ink supply pipe 27 side via the pipe.

The nozzle block 14 in which the above-mentioned groove 25 and the recess 26 are formed is fixed to the base plate 12 via a connecting means such as a leaf spring (not shown), whereby the joint surface of the nozzle block 14 is heated by the heater board 13. It is joined in close contact with the upper surface of the. In this case, the heater board 13 and the nozzle block 14 are positioned so that the heating resistors 16 of the heater board 13 face the grooves 25, respectively, and the flange portion 23 of the nozzle block 14 has the front end of the base plate 12 and the heater board 13. It is pressed in close contact with the surface. As described above, in the present embodiment, the heater board 13 and the nozzle block 14 are fixed to each other through the mechanical connecting means. However, the heater board 13 and the nozzle may be used by using an adhesive agent or by using this adhesive agent together. Of course, it is also possible to connect with the block 14.

As a result, the plurality of ink passages 29 each having the ink discharge port 24 at one end are connected to the heater board 13.
A common ink chamber 30 is formed between the upper surface of the front end of the heater block 13 and each groove 25 of the nozzle block 14, and further communicates with the other end of each of the ink passages 29. 26, the ink in the ink supply pipe 27 is ejected from the ink ejection port 24 through the communication passage 28 and the common ink chamber 30 and the ink passage 29.

The above-mentioned nozzle block 14 may be made of any material as long as it can accurately form the grooves 25 at the predetermined intervals P, but it is excellent in mechanical strength, dimensional stability and ink resistance. It is preferably one.
Materials that meet these requirements include epoxy resin, acrylic resin, diglycol, dialkyl carbonate resin, unsaturated polyester resin, polyurethane resin, polyimide resin, melamine resin, phenol resin,
A urea resin or the like can be used, and it is preferable to employ polysulfone, polyether sulfone, or the like, particularly from the viewpoints of moldability and ink resistance.

By the way, the ink jet head 11 in this embodiment has a print width of 95.8 mm.
11 heater boards 13 are used so as to have 60 ink ejection openings 24, and some of the ink ejection openings 24 of the heater boards 13 located on both sides of the heater board 13 are not used. Further, the cross-sectional shape of each ink passage 29 has an upper bottom of 42 μm, a lower bottom of 56 μm, and a height of 38 μm.
Each has a trapezoidal shape, and the communication passage 28 has an inner diameter of 1
It is a circle of mm.

Therefore, the passage cross-sectional area of the ink discharge port 24 is

[0034]

(Equation 1) (0.054 + 0.036) × 0.034 / 2
= 0.0000153 (mm ² ), the sum of the passage cross-sectional areas of the ink ejection port 24 is

[0035]

## EQU2 ## 0.00153 × 1360 = 2.08 (mm ² ). On the other hand, the sum of the passage cross-sectional areas of the communication passage 28 is

[0036]

Equation 3] ^{0. 5 2 × 3. 14} × 3 = 2. 36 (mm 2) , and the sum of the cross-sectional area of the communication passage 28 than the total cross-sectional area of the ink discharge port 24 is set larger There is.

Next, the number of communicating passages 28 having an inner diameter of 1 mm is set to 1 to
Table 1 shows the results of determining the quality of printing by using five inkjet heads 11 exactly the same as those in the above-described embodiment except that the number was set to 5.

[0038]

[Table 1]

In the case of the ink jet head 11 not provided with one communicating passage 28, image deterioration due to insufficient ink supply was observed. Further, in the case of the inkjet head 11 provided with only two communication passages 28, a slight image deterioration due to insufficient ink supply was observed. In the case of the inkjet head 11 provided with three or more communication passages 28, the sum of the passage cross-sectional areas of the communication passages 28 is larger than the sum of the passage cross-sectional areas of the ink ejection ports 24, so that it can be confirmed that good printing is performed. It was

Therefore, in the case of the communicating passages 28 having an inner diameter of 1 mm, it is possible to manufacture the ink jet head 11 capable of performing good printing by forming at least three communicating passages 28. In this embodiment, the circular communicating passages are formed. Although the openings 28 are set to open at the central portion and the left and right end portions of the hollow portion 26, the number and positions of these communication passages 28 are such that ink can be smoothly supplied to all the ink passages 29. If so, it is not limited to the present embodiment.

In the above embodiment, the full line type ink jet head 11 has been described.
It is naturally possible to apply it to a serial type or to incorporate it in an ink jet cartridge. FIG. 8 shows the appearance of an embodiment of the ink jet cartridge according to the present invention.

That is, the ink jet cartridge 31 in the present embodiment is attached to a carriage of an ink jet device (not shown) in a positioned state so as to exchange electric signals with the ink jet device. The inkjet cartridge 31, which is detachably attached to the carriage, includes an inkjet head 11, a head holder 32 that holds the inkjet head 11, a pressing block 33 that presses the inkjet head 11 against the head holder 32, and ink. An ink tank 34 that accommodates the ink tank 34 and a lid member 35 that seals the inside of the ink tank 34 constitute a main part. The ink tank 34 that occupies most of the volume of the inkjet cartridge 31 An atmosphere communication port 36 for maintaining the atmospheric pressure is formed.

The ink jet head 11 on which a large number of ink ejection ports 24 for ejecting ink is formed has a structure corresponding to the embodiment shown in FIGS. Are pressed and held by the head holder 32 by the pressing block 33. Ink is guided from the ink tank 34 to the common ink chamber 30 and each ink passage 29 via the ink supply pipe 27 and the communication passage 28 of the inkjet head 11 (see FIG. 2 respectively).

The ink jet cartridge 31 in the present embodiment is formed by integrally forming the ink jet head 11 and the ink tank 34. The ink jet head 11 has a structure in which the ink tank 34 side is exchangeably connected. It may be an inkjet cartridge.

FIG. 9 shows the external appearance of an embodiment of an ink jet device according to the present invention equipped with such an ink jet cartridge. That is, the inkjet device of the present embodiment is a full line type color printer,
The inkjet cartridge has four ink tanks 37Y, 37M, and 3 that store yellow ink, magenta ink, cyan ink, and black ink, respectively.
7C, 37B (Hereinafter, these are collectively referred to as the ink tank 3
7) and four ink jet heads 11Y, 11M, 11C, 11B to which ink supply pipes are connected to these ink tanks 37 via connection pipes 38, respectively.
(Hereinafter, these are collectively referred to as the inkjet head 11), and each ink tank 37 is exchangeably connected to a connection pipe 38.

Head driver 4 connected to control device 39
Inkjet head 11 for switching on / off of energization for each heating resistor 16 by 0
Has the same basic structure as that of the embodiment shown in FIGS. 1 to 7, and is arranged along the carrying direction of the carrying belt 41 so as to face the platen 42 with the endless carrying belt 41 sandwiched therebetween. Are arranged at predetermined intervals. And the control device 3
The head moving means 43 for recovery processing whose operation is controlled by 9 can move up and down in the direction opposite to the platen 42. On the side of each inkjet head 11, a head cap 45 for performing recovery processing of the inkjet head 11 by ejecting old ink existing in the ink passage 29 from the ink ejection port 24 prior to the printing operation on the print paper 44. Are arranged in a state of being shifted by a half pitch with respect to the arrangement interval of the inkjet heads 11, and are moved directly below the inkjet heads 11 by the cap moving means 46 whose operation is controlled by the control device 39 and ejected from the ink ejection ports 24. It is designed to receive waste ink.

The conveyor belt 41 for conveying the print paper 44 is wound around the drive roller 48 connected to the belt drive motor 47, and its operation is switched by the motor driver 49 connected to the control device 39. Also,
On the upstream side of the conveyor belt 41, the conveyor belt 41
Is provided with a charger 50 for bringing the print paper 44 into close contact with the conveyor belt 41 by charging the printer. The charger 50 connected to the controller 39 turns on the energization of the charger 50. / OFF can be switched. A paper feed motor 53 for driving and rotating the pair of paper feed rollers 52 is connected to the pair of paper feed rollers 52 for supplying the print paper 44 onto the transport belt 41. The motor 53 is the control device 3
The operation is switched by the motor driver 54 connected to 9.

Therefore, prior to the printing operation on the print paper 44, the ink jet head 11 is lifted away from the platen 42, and then the head cap 4 is moved.
5 moves directly below the inkjet head 11 to perform the recovery processing of the inkjet head 11, then moves the head cap 45 to the original standby position, and further moves the inkjet head 11 to the printing position to the platen 42.
Move to the side. Then, at the same time when the charger 50 is operated, the transport belt 41 is driven, and further, the print paper 44 is placed on the transport belt 41 by the paper feed roller 52, and a predetermined color image is printed on the print paper by each inkjet head 11. Printed on 44.

[0049]

According to the ink jet head of the present invention, by setting the sum of the passage cross-sectional areas of the communication passages larger than the sum of the passage cross-sectional areas of the ink passages, ink is continuously ejected from all ink ejection ports. Even in such a case, the ink can be smoothly supplied from the ink supply pipe to the common ink chamber side at a rate commensurate with the consumption of the ink, resulting in a print defect due to ink shortage. Does not occur.

Further, since the sum of the passage cross-sectional areas of the communication passages may be set larger than the sum of the passage cross-sectional areas of the ink passages, it is possible to set the diameter of the communication passages large and suppress the number thereof to about several. It becomes possible, and the manufacturing cost can be reduced more than the conventional one as the time required for the drilling work is shortened.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing a schematic structure of an embodiment of an inkjet head according to the present invention.

FIG. 2 is a cutaway sectional view showing the internal structure of the embodiment shown in FIG.

FIG. 3 is an enlarged sectional view taken along the line III-III in FIG.

FIG. 4 is a cross-sectional view in which a joint portion between a base plate and a heater board in the embodiment shown in FIG. 1 is extracted and enlarged.

5 is a front view of the nozzle block in the embodiment shown in FIG.

FIG. 6 is a bottom view of the nozzle block corresponding to FIG.

FIG. 7 is a plan view of a nozzle block corresponding to FIG.

FIG. 8 is a perspective view showing the appearance of an embodiment of an inkjet cartridge according to the present invention.

FIG. 9 is a perspective view showing a schematic configuration of an embodiment in which the inkjet device according to the present invention is applied to a full-line type color printer.

[Explanation of symbols]

11, 11Y, 11M, 11C, 11B Inkjet head 12 Base plate 13 Heater board 14 Nozzle block 15 Wiring board 16 Heat generating resistor 17 Electrode pad 18 Adhesive P Space between heat generating resistors 19 Sealing material 20 Electrode pad 21 Connector 22 Discharge port Surface 23 Flange portion 24 Ink ejection port 25 Groove 26 Recessed portion 27 Ink supply pipe 28 Communication passage 29 Ink passage 30 Common ink chamber 31 Inkjet cartridge 32 Head holder 33 Press block 34 Ink tank 35 Lid member 36 Atmosphere communication opening 37Y, 37M, 37C, 37B Ink tank 38 Connection piping 39 Control device 40 Head driver 41 Conveying belt 42 Platen 43 Head moving means 44 Print paper 45 Head cap 46 Cap moving means 47 Bell Drive motor 48 drives rollers 49 motor driver 50 charger 51 charger driver 52 paper feed roller 53 motor 54 motor driver paper feed

Front page continued (72) Inventor Koichi Omata 3-30-2 Shimomaruko, Ota-ku, Tokyo Canon Inc. (72) Inventor Kiyomi Aono 3-30-2 Shimomaruko, Ota-ku, Tokyo Canon Inc. (72) Inventor Yuuki Tajima 3-30-2 Shimomaruko, Ota-ku, Tokyo Canon Inc.

Claims (17)

[Claims] 1. A plurality of ink passages each having an ink ejection port for ejecting ink formed at one end side, and an ejection energy generating element arranged in each of these ink passages for ejecting ink from the ink ejection port. A common ink chamber that communicates with the other end of the ink passage, an ink supply pipe that is arranged along the common ink chamber and is used to supply ink, and a plurality of ink supply pipes that communicate with the common ink chamber. The ink-jet head, wherein the sum of the passage cross-sectional areas of the communication passage is set to be larger than the sum of the passage cross-sectional areas of the ink passages. 2. An element substrate provided with the ejection energy generating element, and a passage forming member having a plurality of grooves, wherein the ink passage includes the element substrate and the passage superposed on the element substrate. The inkjet head according to claim 1, wherein the inkjet head is formed between the groove and the forming member. 3. The ink jet head according to claim 2, wherein a plurality of the element substrates are joined to one passage forming member. 4. The ink supply pipe is incorporated in the passage forming member, and a part of the ink supply pipe faces the common ink chamber formed between the element substrate and the passage forming member. The inkjet head according to claim 2 or 3. 5. The ink jet head according to claim 4, wherein the communication passage is formed in the ink supply pipe facing the common ink chamber. 6. A plurality of ink passages each having an ink ejection port for ejecting ink formed at one end side, and an ejection energy generating element arranged in each of these ink passages for ejecting ink from the ink ejection port. A common ink chamber communicating with the other end of the ink passage, an ink supply pipe arranged along the common ink chamber for supplying ink, and a plurality of ink communicating with the common ink chamber And an ink tank for storing ink to be supplied to the inkjet head. The sum of the passage sectional areas of the communication passage is set to be larger than the sum of the passage sectional areas of the ink passages. An inkjet cartridge characterized by the above. 7. The minimum passage sectional area in the ink path from the ink tank to the ink supply pipe is set to be larger than the sum of the passage sectional areas of the communication passages. Inkjet cartridge. 8. An element substrate provided with the discharge energy generating element, and a passage forming member having a plurality of grooves, wherein the ink passage is formed on the element substrate and the passage overlapped with the element substrate. The inkjet cartridge according to claim 6 or 7, wherein the inkjet cartridge is formed between the groove and the forming member. 9. The inkjet cartridge according to claim 8, wherein a plurality of the element substrates are joined to one passage forming member. 10. The ink supply pipe is incorporated in the passage forming member, and a part of the ink supply pipe faces the common ink chamber formed between the element substrate and the passage forming member. The inkjet cartridge according to claim 8 or 9, 11. The ink jet cartridge according to claim 10, wherein the communication passage is formed in the ink supply pipe facing the common ink chamber. 12. A plurality of ink passages each having an ink ejection port for ejecting ink formed at one end side, and an ejection energy generating element arranged in each of the ink passages for ejecting ink from the ink ejection port. A common ink chamber communicating with the other end of the ink passage, an ink supply pipe arranged along the common ink chamber for supplying ink, and a plurality of ink communicating with the common ink chamber An ink jet device using an ink jet cartridge having an ink jet head having a communication passage of the above, and an ink tank for storing ink to be supplied to the ink jet head, wherein a sum of passage cross-sectional areas of the communication passage is defined as the ink passage. The ink jet device is characterized in that it is set to be larger than the total sum of the passage cross-sectional areas in. 13. The method according to claim 12, wherein the minimum passage cross-sectional area in the ink path from the ink tank to the ink supply pipe is set to be larger than the sum of the passage cross-sectional areas of the communication passages. Inkjet device. 14. The ink substrate further comprises an element substrate provided with the discharge energy generating element and a passage forming member having a plurality of grooves, wherein the ink passage is formed on the element substrate and the passage overlapped with the element substrate. It is what is formed between the said groove | channel of a formation member, and Claim 12 or Claim 13 characterized by the above-mentioned.
An inkjet device according to item 1. 15. A plurality of the element substrates are joined to one passage forming member.
4. The inkjet device according to item 4. 16. The ink supply pipe is incorporated in the passage forming member, and a part of the ink supply pipe faces the common ink chamber formed between the element substrate and the passage forming member. The inkjet device according to claim 14 or 15. 17. The ink jet apparatus according to claim 16, wherein the communication passage is formed in the ink supply pipe facing the common ink chamber.