Printhead and method of manufacturing printhead

Abstract

Provided are a printhead and a method of manufacturing a printhead that can reduce the number of parts and simplify a manufacturing process. The method includes: preparing, as cover members, a first cover member including a supply port through which a liquid can be supplied to an accommodation chamber, and a second cover member not including the supply port; manufacturing a first printhead by joining a first cover member to the housing, the first printhead configured to eject liquid from the ejection port in a case where the liquid is supplied to the accommodation chamber through the supply port; a second printhead is manufactured by joining a second cover member to the housing, the second printhead being detachably attachable to the printing apparatus and configured to eject the liquid from the ejection port without supplying the liquid to the accommodation chamber.

Description

Technical Field

[0001] The present invention relates to a print head and a method of manufacturing a print head. Background Art

[0002] The print head mounted on the serial inkjet printing device includes a storage chamber capable of storing liquid, an ejection unit ejecting the liquid, and a channel member guiding the liquid from the storage chamber to the ejection unit. In such a print head, bubbles are generated inside the channel as the print head is used, and these bubbles must be prevented from moving into the ejection unit and affecting the image.

[0003] Japanese Patent Laid-Open No. H09-183230 discloses a disposable print head that can be replaced on a printing device, and a channel is provided at a middle portion of the disposable print head, the channel having a relatively wide space that can gather and accommodate bubbles generated in the channel using buoyancy. By providing such a storage portion for bubbles in the channel, the disposable print head can prevent the generated bubbles from affecting the ejection operation until the ink in the accommodation chamber is consumed and the print head is replaced.

[0004] Here, there is a continuous ink supply type print head, to which ink is supplied through a tube or the like as the ink stored in the print head is consumed. The continuous ink supply type print head generally performs a suction operation to remove ink containing bubbles from its ejection port. In this case, it is preferred to make the channel width in the channel member as narrow as possible to achieve a high suction pressure for effective suction.

[0005] Therefore, the appropriate channel configuration differs between a disposable type print head that can be replaced after the ink runs out and a continuous ink supply type print head that can perform a printing operation while ink is supplied through a tube, etc., and therefore the two types of print heads cannot be used interchangeably. Therefore, it is difficult to make the manufacturing processes of the disposable type print head and the continuous ink supply type print head universal, which leads to problems such as an increase in the number of parts and a complicated manufacturing process. Summary of the invention

[0006] In view of the above circumstances, the present disclosure provides a print head and a method of manufacturing the print head, which can reduce the number of parts and simplify the manufacturing process.

[0007] To this end, the method for manufacturing a print head disclosed in the present invention is a method for manufacturing a print head, the print head comprising: a printing element plate, the printing element plate having an ejection port array, the ejection port array being an array of multiple ejection ports for ejecting liquid; a shell, the shell comprising a box body portion, in which a storage chamber for storing liquid is formed; and a channel forming portion, in which a channel capable of supplying liquid in the storage chamber to the ejection port array is formed; and a cover member, the cover member covering an opening of the box body portion to define the storage chamber, the method comprising: preparing a first cover member and a second cover member as cover members, the first cover member comprising a supply port through which liquid can be supplied to the storage chamber, and the second cover member not comprising a supply port; manufacturing a first print head by joining the first cover member to the shell, the first print head being capable of ejecting liquid from the ejection port when liquid is supplied to the storage chamber through the supply port; and manufacturing a second print head by joining the second cover member to the shell, the second print head being detachably attached to a printing device and being capable of ejecting liquid from the ejection port without supplying liquid to the storage chamber.

[0008] According to the present disclosure, it is possible to provide a print head and a method of manufacturing the print head which can reduce the number of parts and simplify the manufacturing process.

[0009] Further features of the present invention will become apparent from the following description of exemplary embodiments with reference to the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 is a schematic diagram showing an inkjet printing apparatus;

[0011] Figure 2 is a perspective view showing the appearance of the box;

[0012] Figure 3 is an exploded perspective view of the box;

[0013] Figure 4 is a top view of the housing of the box;

[0014] Figure 5 It is along Figure 4 A cross-sectional view taken along line VV of ;

[0015] FIG. 6A to FIG. 6C are diagrams each showing a channel portion;

[0016] Figure 7 is a perspective view of the space as a channel extracted, modeled and shown as a channel section;

[0017] FIG. 8A to FIG. 8C are diagrams each showing a channel portion;

[0018] 9A to 9Care diagrams each showing a channel portion;

[0019] FIG. 10A to FIG. 10C are diagrams each showing a channel portion; and

[0020] Figures 11A to 11C 2 are diagrams each showing a conventional box. DETAILED DESCRIPTION

[0021] Figure 1 1 is a schematic diagram showing an inkjet printing apparatus (hereinafter also referred to as a "liquid ejecting apparatus") 10 to which the following embodiments can be applied. In the figure, the X direction indicates the scanning direction of the carriage, the Y direction indicates the conveying direction of the printing medium, and the Z direction indicates the vertical upward direction. Note that, assuming that the cartridge is mounted on the printing apparatus, the X, Y, and Z axes shown in the following figures correspond to Figure 1 The same as in is used to illustrate a single print head (hereinafter also referred to as a "cartridge"). The liquid ejection device 10 is configured so that the cartridge 100 can be mounted on the carriage 11. The cartridge 100 mounted on the carriage 11 ejects liquid (hereinafter also referred to as "ink") onto the print medium while moving relative to the print medium 103 to implement printing. In other words, the liquid ejection device 10 is a serial printing device. During the ejection process, the cartridge 100 ejects the liquid while the carriage 11 reciprocates in the X direction. While the liquid is ejected from the cartridge 100, the print medium 12 is conveyed at intervals of a predetermined distance along a direction (Y direction) orthogonal to the reciprocating direction of the carriage 11 to form an image on the print medium 12.

[0022] Note that although Figure 1 The middle box 100 is shown as a disposable type box that can be detachably attached to the carriage 11, but the box 100 can also be a continuous ink supply type. In this case, the inkjet printing device 10 is provided with: a relatively large capacity ink cartridge that stores ink that can be supplied to the box 100; and a tube that can supply ink from the ink cartridge to the print head while following the movement of the box 100.

[0023] Figure 2 is a perspective view showing the appearance of one of the cartridges 100 . Figure 3 1 is an exploded perspective view of the cartridge 100. The cartridge 100 includes a printing element board 150 for ejecting liquid, a housing (casing) 110 formed with a receiving chamber 140 for receiving liquid, and a cover (cover member) 120. The filter 210 and the absorber 130 for receiving the liquid are stored in the receiving chamber 140. The liquid received in the absorber 130 is discharged through a channel portion ( Figure 2 and Figure 3The liquid ejection device 100 is provided with a plurality of ejection ports (not shown) in the printing element board 150. In the present embodiment, the absorber 130 is inserted into the receiving chamber 140 as a means for generating negative pressure to hold the liquid, but the liquid may be similarly held by using a configuration that uses a negative pressure generating unit such as a pressure control unit or a circulation unit. The disposable cartridge 100 is configured to be detachably attached to the bracket 11 of the liquid ejection device 10.

[0024] The liquid contained in the containing chamber 140 is usually color ink. Cyan, magenta and yellow ink are contained in the containing chamber. Incidentally, although the configuration that the box 100 includes three containing chambers 140 is exemplarily described in the present embodiment, the present embodiment is not limited to this configuration, but can be applied to the situation with more than four containing chambers. For example, the following concept is similarly applicable to the box that contains the ink of four colors that also include black ink.

[0025] The liquid ejecting apparatus 10 also performs maintenance operation by applying negative pressure to the ejecting ports to suck out the liquid from the ejecting ports. Through this maintenance operation, bubbles generated by the ejection of the liquid or the like are discharged from the ejecting ports together with the liquid.

[0026] exist Figure 3 , three absorbers 130A, 130B and 130C for cyan, magenta and yellow are shown. In order to easily supply liquid, the shape of the absorber 130 is ideally close to a cube. Here, in the case where the size of the absorber 130 is changed in consideration of the liquid capacity, it is preferred to extend the absorber 300 in the direction of gravity (Z direction). Increasing the size of the absorber 130 in the scanning direction (X direction) will widen the box 100, which in turn increases the size of the entire device. In addition, increasing the size of the absorber 130 in the array direction (Y direction) of the ejection port will lengthen the channel from the absorber 130 to the printing element board 150 and increase the flow resistance in the liquid supply, which is not preferred.

[0027] The absorber 130 is made of a fiber material, a porous material, etc. and can keep the ink inside by the capillary force acting thereon. The absorber 130 is stored in the accommodation chamber 140 of the housing 110 and abuts against the corresponding filter 210 used as a dust collector, and the liquid in the absorber 130 is supplied to the printing element board 150 through the filter 210 and the channel portion.

[0028] The printing element board 150 is an ejection unit for ejecting ink, and is arranged (attached) on the lower side of the bottom surface of the housing 110 along the gravity direction. The printing element board 150 includes a heating resistor element not shown, generates bubbles in the liquid using the heat from the heating resistor element, and ejects the liquid from the ejection port using the energy of the generated bubbles. The printing element board 150 is arranged around the bottom of the absorber 130A and the absorber 130B and away from the absorber 130C. The housing 110 has a box body 240 in which a storage chamber 140 is formed and a channel forming part 250 protruding from the box body 240 in the -Z direction. The printing element board 150 is attached to the -Z side of the channel forming part 250. Specifically, the printing element board 150 is arranged on the bottom surface of the entire box 100, and when ejecting liquid, the liquid is ejected from a position close to the print medium 12. The heating resistor element of the printing element board 150 can be configured to have different sizes between the disposable type and the continuous ink supply type.

[0029] The cover 120 is provided to close the opening of the housing 110 and define a housing chamber 140 for housing the absorber 130. Also, the configuration of the cover 120 differs between the disposable type and the continuous ink supply type. Figure 3 A cover 120 for a continuous ink supply type is shown. The cover 120 for a disposable type includes an atmosphere communication port not shown, through which external air can be sucked in, and the amount of the external air sucked in is equal to the amount of liquid consumed by the injection in the absorber 130. The cover 120 for a continuous ink supply type is provided with a supply port 121, through which liquid can be supplied to the containing chamber. The cover 120 for a disposable type is not provided with a supply port. In the manufacturing process, the cover 120 for a disposable type and the cover 120 for a continuous ink supply type are prepared.

[0030] Figure 4 is a top view showing the housing 110 of the cartridge 100, Figure 5 It is along Figure 4 The cross-sectional view is taken along the VV line of Figure 5 The absorber 130 is omitted in the figure.

[0031] In the box 100 of the present embodiment, the inside of the housing 110 is divided to form three accommodating chambers 140 so that absorbers 130A, 130B and 130C can be arranged side by side in the Y direction. When the box 100 is mounted on the carriage 11 and scanned together with the carriage 11, the box 100 moves in the +X direction or the -X direction. The printing element plate 150 includes a jet array 1101 formed by arranging the jets in the Y direction. In a word, absorbers 130A, 130B and 130C are arranged along the direction identical with the array direction of the jets and intersecting (in the present embodiment, orthogonally intersecting) with the scanning direction.

[0032] The housing 110 is formed of a molded resin. In the formation of the housing 110, the channel forming portion 250 and the box portion 240 are molded separately (primary molding), and then the channel forming portion 250 and the box portion 240 are joined (secondary molding). Note that the secondary molding may use a method involving forming spaces between the abutting portions of the box portion 240 and the channel forming portion 250 and injecting resin into these spaces, or using other connection methods such as bonding. By molding the channel forming portion 250 and the box portion 240 separately as described above and then joining the channel forming portion 250 and the box portion 240, a channel can be formed in the housing 110. Incidentally, in the present embodiment, the accommodating chambers 140 are arranged at equal intervals, but the intervals do not have to be equal.

[0033] Fig. 6A is a top view of the channel portion 160, Figure 6B is a front view of the channel portion 160, Figure 6C 160 is a side view of the channel portion 160. The channel portion 160 is a model obtained by extracting the channel for ink formed by the box portion 240 and the channel forming portion 250, and includes channels (160A, 160B, and 160C) for three colors. These channels are independent of each other. Specifically, as Fig. 6A As shown, the channels 160A, 160B, and 160C are sequentially arranged along the Y direction. Such a channel portion 160 is configured to be able to supply the liquid in the accommodation chamber 140 to the printing element board 150 .

[0034] Figure 7 is a perspective view of a space as a channel for liquid within the housing 110 extracted, modeled, and shown as a channel portion 160 .

[0035] Fig. 8A is a top view of channel 160A, Figure 8B is a side view of channel 160A, Figure 8C is a front view of channel 160A. Fig.9A is a top view of channel 160B, Fig. 9B is a side view of channel 160B, Fig. 9C is a front view of channel 160B. Fig. 10A is a top view of channel 160C, Fig. 10B is a side view of channel 160C, Fig. 10C is a front view of channel 160C.

[0036] like Figures 8A to 8CAs shown, the channel 160A includes an opening portion 260A provided with a filter 210A, a first storage portion (air buffer) 270A, a second storage portion 230A, and a narrow channel 280A connecting the first storage portion 270A and the second storage portion 230A. The channel 160A also includes a connection channel 290A to be connected to the printing element board 150. The first storage portion 270A and the second storage portion 230A have a larger capacity than other areas, and can store (hold) bubbles generated by ejection, etc.

[0037] The opening portion 260A is an opening for receiving the liquid passing through the filter 210A, and is located at the bottom surface of the storage chamber 140 that accommodates the absorber 130A. The first storage portion 270A and the second storage portion 230A are formed as a space that widens toward the upper side in the vertical direction. Specifically, in order to become a space that widens toward the upper side in the vertical direction, the first storage portion 270A is provided with a tapered portion 271A, and the second storage portion 230A is also provided with a tapered portion 231A. Such a configuration can utilize buoyancy to collect bubbles generated in the channel and prevent the bubbles from approaching the injection port.

[0038] In addition, in order to enable the bubbles in the first storage part 270A to be discharged from the ejection port by the suction operation performed by the liquid ejection device 10, the first storage part 270A has an optimized cross-sectional area when viewed from the suction direction. Furthermore, in order to enable a sufficient liquid flow rate to discharge the bubbles in the first storage part 270A during the suction operation, the cross-sectional area of ​​the narrow channel 280A connected to the upstream side of the first storage part 270A is smaller than the cross-sectional area of ​​the first storage part 270A when viewed from the suction direction. Specifically, in Fig. 8A In the embodiment, the cross-sectional area of ​​the first storage portion 270A (the area of ​​the dotted rectangle) is large enough. Figure 8C In the embodiment, the cross-sectional area (area of ​​the rectangle) of the narrow channel 280A is sufficiently smaller than the cross-sectional area (area of ​​the trapezoid) of the first storage portion 270A.

[0039] At the second storage part 230A, two cones, namely the first tapered part 232A and the second tapered part 233A, are formed so that bubbles move toward the filter through a narrow space. In order to prevent the formation of a meniscus while moving the bubbles upward, the angle of the first tapered part 232A relative to the horizontal direction is preferably 10 degrees or more and 80 degrees or less, more preferably 20 degrees or more and 60 degrees or less, and further preferably 30 degrees or more and 50 degrees or less. At the second storage part 230A, the distance from the space in the second storage part 230A to the filter 210A needs to be short to increase the flow rate of the ink flowing in a recovery operation such as suction. For this reason, the angle of the second tapered part 233A relative to the horizontal direction is preferably 45 degrees or less, more preferably 30 degrees or less, and further preferably 20 degrees or less.

[0040] The first storage portion 270A is connected to a connection channel 290A, and the connection channel 290A is connected to an ejection port array in the printing element board 150 .

[0041] like Figures 9A to 9C As shown, the passage 160B includes an opening portion 260B provided with a filter 210B, a first storage portion (air buffer) 270B, a second storage portion 230B, a narrow passage 280B connecting the first storage portion 270B and the second storage portion 230B, and a connecting passage 290B.

[0042] The opening portion 260B is an opening for receiving the liquid passing through the filter 210B, and is located at the bottom surface of the storage chamber 140 that accommodates the absorber 130B. The narrow channel 280B connecting the first storage portion 270A disposed near the nozzle array and the second storage portion 230B disposed near the storage chamber includes a horizontal portion 2801B extending in the Y direction. In addition, the first storage portion 270B and the second storage portion 230B are formed as a space that widens toward the upper side along the vertical direction. In order to become a space that widens toward the upper side along the vertical direction, the first storage portion 270B is provided with a tapered portion 271B, and the second storage portion 230B is provided with two cones, that is, a first tapered portion 232B and a second tapered portion 233B. Such a configuration can collect bubbles generated in the channel by utilizing buoyancy and prevent bubbles from approaching the injection port.

[0043] In addition, in order to discharge the bubbles in the first storage part 270B from the ejection port by the maintenance work performed by the liquid ejection device 10, the first storage part 270B has an optimized cross-sectional area. In addition, the cross-sectional area of ​​the narrow channel 280B connected to the upstream side of the first storage part 270B is smaller than the cross-sectional area of ​​the first storage part 270B, which can provide a sufficient liquid flow rate to discharge the bubbles in the first storage part 270B during the maintenance operation. Specifically, in Fig.9A In the embodiment, the cross-sectional area of ​​the first storage portion 270B (the area of ​​the dotted rectangle) is large enough. Fig. 9C In the embodiment, the cross-sectional area of ​​the narrow channel 280B (the area of ​​the horizontal portion 2801B) is sufficiently smaller than the cross-sectional area of ​​the first storage portion 270B (the area of ​​the trapezoid).

[0044] In order to move the bubbles upward while preventing the formation of a meniscus, the angle of the first tapered portion 232B relative to the horizontal direction is preferably 10 degrees or more and 80 degrees or less, more preferably 20 degrees or more and 60 degrees or less, and further preferably 30 degrees or more and 50 degrees or less. At the second storage portion 230B, the distance from the space within the second storage portion 230B to the filter 210B needs to be short in order to increase the flow rate of the ink flowing in the recovery operation such as suction. For this reason, the angle of the second tapered portion 233B relative to the horizontal direction is preferably 45 degrees or less, more preferably 30 degrees or less, and further preferably 20 degrees or less.

[0045] The first storage portion 270B is connected to a connection channel 290B, and the connection channel 290B is connected to the ejection port array in the printing element board 150 .

[0046] like Fig. 10A As shown, the passage 160C includes an opening portion 260C provided with a filter 210C, a first storage portion (air buffer) 270C, a second storage portion 230C, a narrow passage 280C connecting the first storage portion 270C and the second storage portion 230C, and a connecting passage 290C.

[0047] The opening portion 260C is an opening for receiving the liquid passing through the filter 210C, and is located at the bottom surface of the storage chamber 140 that accommodates the absorber 130C. The narrow channel 280C that connects the first storage portion 270C disposed near the nozzle array and the second storage portion 230C disposed near the storage chamber includes a horizontal portion 2801C extending in the Y direction. Moreover, the first storage portion 270C and the second storage portion 230C are formed as a space that widens toward the upper side along the vertical direction. In order to become a space that widens toward the upper side along the vertical direction, the first storage portion 270C is provided with a tapered portion 271C, and the second storage portion 230C is provided with two cones, that is, a first tapered portion 232C and a second tapered portion 233C. Such a configuration can utilize buoyancy to collect bubbles generated in the channel and prevent bubbles from approaching the injection port.

[0048] Furthermore, in order to discharge the bubbles in the first storage part 270C from the ejection port by the maintenance operation performed by the liquid ejection device 10, the first storage part 270C has an optimized cross-sectional area. Furthermore, the cross-sectional area of ​​the narrow passage 280C connected to the upstream side of the first storage part 270C is smaller than the cross-sectional area of ​​the first storage part 270C, which can provide a sufficient liquid flow rate to discharge the bubbles in the first storage part 270C during the maintenance operation. Specifically, Fig. 10A In the embodiment, the cross-sectional area of ​​the first storage portion 270C (the area of ​​the dotted rectangle) is large enough. Fig. 10C In the embodiment, the cross-sectional area of ​​the narrow channel 280C (the area of ​​the horizontal portion 2801C) is sufficiently smaller than the cross-sectional area of ​​the first storage portion 270C (the area of ​​the trapezoid).

[0049] In order to prevent the formation of a meniscus while moving the bubbles upward, the angle of the first tapered portion 232C relative to the horizontal direction is preferably 10 degrees or more and 80 degrees or less, more preferably 20 degrees or more and 60 degrees or less, and further preferably 30 degrees or more and 50 degrees or less. At the second storage portion 230C, the distance from the space in the second storage portion 230C to the filter 210C needs to be short in order to increase the flow rate of the ink flowing in the recovery operation such as suction. For this reason, the angle of the second tapered portion 233C relative to the horizontal direction is preferably 45 degrees or less, more preferably 30 degrees or less, and further preferably 20 degrees or less.

[0050] The first storage portion 270C is connected to a connection channel 290C, and the connection channel 290C is connected to the ejection port array in the printing element board 150 .

[0051] As mentioned above, the passage 160 of the box 100 in the present embodiment all comprises the first storage part that can keep bubble.The cross-sectional area of ​​the first storage part makes it possible to utilize the liquid flow rate produced by the maintenance operation to remove bubble, and the first storage part extends in the vertical direction, and has a small passage with a smaller cross-sectional area on the upstream side, and the small passage is connected to the first storage part.Utilize this structure, the disposable type box is retained in the first storage part by the bubble produced and prevents the bubble from affecting the ejection operation until the replacement box.On the other hand, the continuous ink supply type box can effectively remove the bubble trapped in the first storage part in the suction operation.In other words, the channel forming part 250 in the present embodiment above-mentioned can be used interchangeably for disposable type and continuous ink supply type, thereby making the part manufacturing process generalization of the print head of these types.Can provide the print head and the method for manufacturing the print head that can reduce the number of parts and simplify the manufacturing process like this.

[0052] FIG. 11A to FIG. 11C 1 and 2 are views each showing a conventional cartridge 300 described as a comparative example to the present embodiment. Fig.11AA top view of a housing 320 (350) of a box 300 is shown, with its cover removed. Three absorbers 310 are provided inside the housing 320 (350) of the box 300, and liquid is held in the absorbers 310. The box 300 is mounted on a carriage not shown and ejects liquid while moving in the X direction. The liquid is supplied to a printing element plate 330 (shown by a dotted line) from the absorber 310 containing the liquid through a channel. The inside of the box 300 is divided into a T shape, and the absorber 310 is provided in each of the divided sections. In the box 300, absorbers 310B and 310C are arranged along the X direction as a scanning direction. The liquid held in the absorber 310B is ejected from the ejection port array 340B, and the liquid held in the absorber 310C is ejected from the ejection port array 340C.

[0053] Fig. 11B It is along Fig.11A The sectional view of the XIB-XIB line. Note that Fig. 11B The absorber 310 is omitted from illustration. The cartridge 300 is a disposable type cartridge and can be replaced with another cartridge when the internal ink runs out.

[0054] The housing 320 of the box 300 includes a channel 360 for supplying liquid from the absorber 310 to the printing element plate 330. The channel 360 is respectively provided for the three absorbers 310, and the liquid from the corresponding absorber 310 is supplied to the corresponding ejection port array 340 in the printing element plate 330. Since the box 300 is a disposable box, the channel 360 is also used as a bubble storage portion. The channel 360 has enough capacity to store bubbles therein. The bubbles generated can be stored in this way without affecting the liquid ejection until the box is replaced.

[0055] Fig. 11C 3 is a cross-sectional view showing a housing 350 of a conventional continuous ink supply type cartridge. The housing 350 includes a channel 370 for supplying liquid from the absorber 310 to the printing element board 330. The channels 370 are provided for three absorbers 310, respectively, and supply liquid from the corresponding absorbers 310 to the corresponding ejection port arrays 340 in the printing element board 330.

[0056] The continuous ink supply type cartridge is configured to remove the ink containing bubbles from the ejection port by performing a suction operation. Therefore, the channels 370 each include a portion having a small area and a narrow channel width, the area being orthogonal to the direction of the suction liquid, that is, the channel cross-sectional area is small. This allows a higher suction pressure to effectively discharge bubbles.

[0057] As described above, the channel shape in the conventional configuration is different between the disposable type and the continuous ink supply type. Therefore, the disposable type cartridge cannot be used as a continuous ink supply type print head, and two types of housings are required for the disposable type and the continuous ink supply type. This increases the number of parts and complicates the manufacturing process.

[0058] However, having the configuration of the present embodiment enables providing a print head and a method of manufacturing the print head that can reduce the number of parts and simplify the manufacturing process.

[0059] Although the present disclosure has been described with reference to exemplary embodiments, it is to be understood that the present disclosure is not limited to the disclosed exemplary embodiments. The scope of the following claims is to be accorded the broadest interpretation so as to encompass all such modifications and equivalent structures and functions.

Claims

1. A method for manufacturing a print head, the print head comprising: a printing element board having an ejection port array, the ejection port array being an array of a plurality of ejection ports for ejecting liquid, A housing, the housing comprising: a housing portion in which a storage chamber for storing the liquid is formed, and a channel forming portion in which a channel configured to supply the liquid in the storage chamber to the ejection port array is formed, and a cover member covering the opening of the box body to define the accommodation chamber, The method comprises: preparing a first cover member and a second cover member as the cover member, the first cover member including a supply port through which the liquid can be supplied to the storage chamber, and the second cover member not including the supply port; a first print head configured to eject the liquid from the ejection port when the liquid is supplied to the storage chamber through the supply port, by bonding the first cover member to the housing; and A second print head is manufactured by bonding the second cover member to the housing, the second print head being detachably attachable to a printing apparatus and configured to eject the liquid from the ejection port without supplying the liquid to the accommodation chamber.

2. The method for manufacturing a print head according to claim 1, wherein: The channel has: a first air buffer configured to hold bubbles generated in the channel and discharge the bubbles when a suction operation of sucking the liquid from the ejection port is performed, and A narrow passage connected to the upstream side of the first air buffer when viewed from the direction in which the liquid flows in the suction operation and having a cross-sectional area smaller than that of the first air buffer.

3. The method for manufacturing a print head according to claim 1 or 2, wherein: An atmosphere communication port is formed in the second cover member, and the second cover member communicates with the atmosphere through the atmosphere communication port.

4. The method for manufacturing a print head according to claim 2, wherein: The first air buffer has a tapered portion as a space that widens toward an upper side in a vertical direction in a state in which the print head is mounted to the printing apparatus.

5. The method for manufacturing a print head according to claim 2, wherein: The channel also has a second air buffer connected to an upstream side of the narrow channel and configured to hold air bubbles generated in the channel.

6. The method for manufacturing a print head according to claim 5, wherein: The second air buffer has a tapered portion as a space that widens toward an upper side in a vertical direction in a state in which the print head is mounted to the printing apparatus.

7. The method for manufacturing a print head according to claim 1 or 2, characterized in that: The method further comprises: shaping the box portion and the passage forming portion; and The housing is formed by joining a formed box portion and a formed passage forming portion.

8. The method of manufacturing a print head according to claim 1 or 2, further comprising attaching the printing element board to the housing so that the channel and the plurality of ejection ports are continuous with each other.

9. The method for manufacturing a print head according to claim 8, wherein: The printing element board attached to the housing in the attachment is provided with a heating resistor element having a different size between the first print head and the second print head.

10. A print head, comprising: a printing element plate having an ejection port array, the ejection port array being an array of a plurality of ejection ports for ejecting liquid; A housing, the housing comprising: a housing portion in which a storage chamber for storing the liquid is formed, and a channel forming portion in which a channel configured to supply the liquid in the storage chamber to the ejection port array is formed, and a cover member covering the opening of the housing to define the accommodation chamber, wherein The channel comprises: a first air buffer configured to hold bubbles generated in the channel and discharge the bubbles when a suction operation of sucking the liquid from the ejection port is performed, and A narrow passage connected to the upstream side of the first air buffer when viewed from the direction in which the liquid flows in the suction operation and having a cross-sectional area smaller than that of the first air buffer.

11. The print head according to claim 10, wherein: The first air buffer has a tapered portion as a space that widens toward an upper side in a vertical direction in a state in which the print head is mounted to the printing apparatus.

12. The print head according to claim 10, wherein: The channel also has a second air buffer connected to an upstream side of the narrow channel and configured to hold air bubbles generated in the channel.

13. The print head according to claim 12, wherein: The second air buffer has a tapered portion as a space that widens toward an upper side in a vertical direction in a state in which the print head is mounted to the printing apparatus.

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