TWI329072B - Ink guiding structure and inkjet printhead using the same - Google Patents

Description

1329072 96001 24728 twf.doc/p IX. Description of the Invention: [Technical Field] The present invention relates to an ink guiding structure, and more particularly to an ink guiding structure applied to inkjet printing and application thereof The ink head of the mouth. [Prior Art]

The principle of ink jet printing is to use an instantaneous high pressure to squeeze the ink to form ink drops and eject them onto the print medium to form a pattern on the print medium. Currently, ink jet printing technology has been widely used in industrial and commercial applications such as document output or material coating.

FIG. 1 illustrates a conventional ink jet printhead. Figure 2 is a partial enlarged view of Figure 1. Referring to FIG. 1 and FIG. 2, the ink jet print head 1 has a substrate 110 and an ink barrier layer (or dry film layer, ink chamber layer) 120 disposed on the substrate 110. The ink barrier layer 120 has a plurality of ink chambers 122 and a plurality of ink channels 124, wherein the ink channels 124 respectively connect the ink chambers (2) to the substrate 11 The supplemental opening (inksi〇f says vm) 112' and the ink replenishing opening 112 penetrates the substrate ho directly or by connecting other trenches. The heart-shaped ink head 1〇0* has a plurality of actuating elements 130 disposed above the substrate 110 and located in a corresponding pressure source for use as ink. In addition, the '^# ink head drain also has a orifice sheet (not, .. not) disposed on the ink barrier layer 120, and the orifice sheet 5 1329072 96001 24728 twf.doc/p has many The orifices 142' communicate with the ink chambers 122, respectively.

It is worth noting that 'when the actuating element 130 is, for example, a heat generating element, the actuating element 130 generates heat to generate a high pressure bubble in the ink chamber 122 and the ink is bubbled through the orifice 142 to form an ink droplet and spray. Send to print media. However, after the completion of the ink-jetting operation, the bubbles generated by the actuating member 13 will be concentrated in the direction of the ink backfill in the ink chamber 122 away from the inner side of the ink flow path 124, thus remaining in the actuating member 13 On the surface or part of the surface, this leads to a shortened life of the actuating element 13 . Furthermore, 'industrial inkjet printing requires a large volume of ink droplets. Since each ink chamber 122 is connected to only a single ink flow path 124, the rate at which ink is replenished to these ink chambers 122 will be relatively reduced. Therefore, the design of the conventional ink jet head 100 cannot satisfy the large volume of ink droplets and the high printing frequency. [Content of the invention]

SUMMARY OF THE INVENTION The present invention is directed to an ink guiding structure suitable for use in an ink jet printhead for reducing air bubble residual on the surface of an actuating element of an ink jet printhead. The present invention refers to an ink guiding structure suitable for ink jet printing to accelerate the supply of ink. π, use The invention refers to an ink jet printhead whose ink guiding structure acts on the surface of the actuator to retain air bubbles. In the meantime, water = Ming refers to an ink jet print head whose ink guiding structure accelerates the ink. The present invention proposes an ink guiding bow structure for guiding the ink supplied from the opening of the ink. 4 water age meter ink transfer layer. Ink 6 1329072 96001 24728twf.doc/p

The water barrier layer includes a plurality of ink chambers, a plurality of first ink flow paths, and a plurality of second ink flow paths. These ink chambers are formed in the ink barrier layer and are suitable for storing ink. The first ink flow paths are formed in the ink barrier layer and respectively communicate the front ends of the ink chambers to the ink replenishing openings, each of the first ink flow paths having an inlet end adjacent to the ink replenishing opening and away from the population end And adjacent to an outlet end of the corresponding ink chamber front end, and the inlet end of each first ink flow path is larger than the outlet end thereof. The second ink flow paths are formed in the ink barrier layer and respectively connect the rear ends of the ink chambers to the ink replenishing openings, wherein the front end of each of the ink chambers is closer to the ink replenishing opening than the rear end thereof. The invention further provides an ink jet printhead comprising a substrate, an ink barrier layer, a plurality of actuating elements, and a orifice sheet. The substrate has at least one ink replenishing opening for supplying ink. The ink barrier layer is disposed on the substrate. ink

The water barrier layer includes a plurality of ink chambers, a plurality of first ink flow channels, and a plurality of second ink flow paths: the ink chambers are formed in the ink barrier layer and are adapted to store ink. The first ink flow channels are formed in the ink transfer layer, and respectively connect the materials of the ink chambers to the ink opening, and each of the first ink flow paths has a human end adjacent to the ink refilling opening and Far from the inlet end and adjacent to the outlet end of the corresponding ink (four), and the end of each of the first ink channels is larger than the outlet end. The second ink flow paths are formed in phase inversion of the ink and respectively connect the rear ends of the ink chambers to the ink replenishing openings, wherein the front end of each of the ink chambers is closer to the ink refilling opening than the rear end thereof. The rotating actuating elements are placed in these ink chambers as a source of pressure for the ink. The orifice sheet is disposed on the ink barrier layer 7 1329072 96001 24728 twf.doc/p and has a plurality of orifices which correspond to the ink chambers, respectively. In one embodiment of the invention, the width of the second ink flow path is less than the width of the ink chamber. In one embodiment of the invention, the ink barrier layer further includes a common ink flow path that connects the second ink flow paths, wherein one of the second ink channels passes through the common ink flow path, another second The ink flow path, the ink chamber connecting the second ink flow path, and the first ink flow path connecting the ink chamber are connected to the ink replenishing opening.

In one embodiment of the invention, the sum of the width of the common ink flow path and the length of the second ink flow path is less than the distance from the ink chamber to the boundary of the ink barrier layer. In one embodiment of the invention, the ink barrier layer further includes a plurality of return ink flow paths ‘ which respectively connect the second ink flow paths to the ink replenishing opening 0

In one embodiment of the invention, the sum of the width of the return ink flow path and the length of the second ink flow path is less than the distance from the ink chamber to the boundary of the ink barrier layer. In one embodiment of the invention, the width of the return ink flow path is less than the distance between two adjacent second ink flow paths. In one embodiment of the invention, the return ink flow prop has a first end and a second end, the first end being adjacent to an end of its corresponding second ink flow path, the end being remote from its corresponding ink chamber, And the second end is adjacent to the tomb water supplement opening. In one embodiment of the invention, each of the return ink flow items has a segment of 81329072 96001 24728 twf.doc/p and a second segment, and the second segment is substantially parallel to the corresponding second ink flow path. In one embodiment of the invention, the ink replenishing opening is an elongated slot' and the first segment of each returning ink flow path is substantially parallel to the direction of extension of the ink replenishing opening.

The invention further provides an ink jet printhead comprising a substrate, an ink barrier layer, a plurality of actuating elements and a orifice sheet. The substrate has at least one ink replenishing opening for supplying ink. The ink barrier layer is disposed on the substrate. The ink barrier layer includes a plurality of ink chambers, a plurality of first ink flow channels, and a plurality of second ink flow paths. These ink chambers are formed in the ink barrier layer and are suitable for storing ink. The first ink flow paths are formed in the ink barrier layer and respectively communicate the front ends of the ink chambers to the ink replenishing openings, each of the first ink flow paths having an inlet end adjacent to the ink replenishing opening and away from the inlet end And adjacent to an outlet end of the front end of its corresponding ink chamber. These second ink flow paths are formed in the ink barrier layer and respectively communicate the rear ends of the ink chambers to the ink replenishing opening' where the front end of each ink chamber is closer to the ink replenishing opening than the rear end thereof. These actuating elements are respectively disposed within the ink chambers to serve as a source of pressure for the ink. The orifice sheet is disposed on the ink barrier layer and has a plurality of orifices corresponding to the ink chambers, respectively. When the actuating element performs the ink ejecting action, the ink is ejected from the corresponding ink chamber to the corresponding ejecting hole and from the front end and the rear end of the ink chamber along the first ink flow path direction and the second ink flow path direction, respectively. Flowing out, when the actuating element is in an ink-jetting action, the ink flows from the first ink flow path and the second ink flow path to the ink chambers at the front end and the rear end of the corresponding ink chamber, respectively. 9 1329072 9600] 24728 tw £doc/p In the present invention, the ink barrier layer further includes a plurality of return ink flow paths, and the second ink core channels of the county are connected to the ink replenishing opening Ο in the present invention. In the embodiment, each - returns to the ink flow path and has a first segment and a second segment, and the first segment is parallel to the direction of extension of the ink replenishing opening and the second segment is substantially parallel to the corresponding second Ink flow path. Based on the above, the present invention employs a dual ink flow path to supply ink to the ink, thereby 'accelerating the supply of ink, which helps to increase the column rate of the ink jet print. · To make the above and other features and advantages of the present invention It can be more obvious, and the following is a detailed description of the various embodiments' and the following description. [Embodiment] The following various implementations are referred to as additional embodiments to illustrate a specific embodiment that can be used in February. In addition, the terms used in the present invention, such as "upper", "lower", "before", "after", "left", "曰", etc., refer only to the direction of the additional drawing. Therefore, the direction of use DO is used to illustrate, not to limit the invention. Figure 3 shows an ink jet printhead of one embodiment of the present invention, and Figure 4 shows an enlargement. Referring to Figures 3 and 4, the present invention and the _ 1 print head include a substrate 21G which can also be seen in Figure 6 in which the substrate B has an ink replenishing opening 212 for supplying ink. In the ink, the ink replenishing opening is not limited to a specific shape, and may be, for example, an ink slot or an ink channel, but is not limited to this 96001 24728 twf.doc/p. The ink jet printhead 200 further includes an ink barrier layer 220 disposed above the substrate 210 as an ink guiding structure. The ink barrier layer 220 includes a plurality of ink chambers 222 formed in the ink barrier layer 220 for storing ink. The ink barrier layer 220 further includes a plurality of first ink flow channels 224 formed in the ink barrier layer 220 and respectively communicating the front ends 222a of the ink chambers 222 to the ink replenishing openings 212. The first ink flow path 224 has an inlet end 224a adjacent to the ink replenishing opening 212, and the first ink flow path 224 has an outlet end 224b adjacent the ink chamber 222 and further away from the inlet end 224a relative to the inlet end 224a. In one embodiment, the inlet end 224a of each first ink flow path 224 is larger than its outlet end 224b. It should be noted that although the inlet end 224a of the first ink flow path 224 has a distance ' from the edge of the ink replenishing opening 212, it is still referred to as the first ink flow path 224 of the present invention to communicate with the ink replenishing opening 212 or the like. Further, the inlet end 224a and the outlet end 224b of the first ink flow path 224 are opposite to the ink replenishing opening 212. The ink barrier layer 220 further includes a plurality of second ink flow channels 226 formed in the ink barrier layer 220 and respectively connecting the ink chamber 222 rear end 222b to the ink replenishing opening 212' each of the ink chambers The front end 222a of the chamber 222 is closer to the ink replenishing opening 212 than its rear end 222b. Although the second ink flow path 226 has a distance from the edge 226a of the ink chamber 222 from the edge of the ink replenishing opening 212, it is still referred to as the second ink flow path 226 of the present invention to communicate with the ink replenishing opening 212 or the like. 1329072 96001 24728 twf.doc/p The inkjet printhead 200 further includes a plurality of actuating elements 230 disposed in the ink chambers 222, respectively, for use as a source of pressure for the ink. In one embodiment, when the actuating element 230 is a heating element, it is typically transmitted through a resistive layer disposed on the surface of the substrate 210 and defined by wires electrically connected to the resistive layer. The ink chambers 222 are respectively communicated with the ink replenishing openings 212' and expose these actuating elements (heating elements) 230. In a preferred embodiment, the actuating elements (heating elements) 230 are covered with a further protective layer (not shown), such as a layer of silicon nitride (SiN), carbonized stone ( a layer or a stack of tantalum nitride and tantalum carbide. Therefore, the ink chamber 222 of the present invention does not expose the actuating elements 230, and does not merely mean that the ink chambers 222 expose the actuating elements 230 to air or Exposure to the outer surface of the substrate 21 尚 means that the ink barrier layer 220 does not directly cover the actuating elements (heating elements) 230. The ink jet head 200 further includes a orifice sheet 240, which can be seen in FIG. 8 and 8. The other layers of the substrate and the ink barrier layer 220 are not shown in FIG. 6 and FIG. 8. The orifice sheet 240 is disposed on the ink barrier layer 220 and has a plurality of nozzle holes 242. They correspond to the ink chambers 222' for outputting ink droplets respectively. Fig. 5 and Fig. 6' show the ink flow direction when the actuating element of Fig. 3 operates. Please refer to Fig. 5 and Fig. 6 'When the actuating element 230 performs Heating action, causing the ink to boil and generating ink bubbles 800 for erupting The ink bubbles 8 will push the ink so that the ink flows along the arrows toward the first ink flow path 224, the second ink flow path 226, and the injection holes 242. Scratch 12 1329072 96001 24728 twf.doc/p Figure 7 and 8 depicts the flow of ink after actuation of the actuating element 230 of Figure 3. Referring to Figures 7 and 8, after the actuating element 230 completes the ink jet action, the ink will follow the arrows through the first ink flow path 224 and The two ink flow paths 226 flow to fill the ink chamber 222.

In the present embodiment, the ink barrier layer 220 further includes a common ink flow path 228' as shown in FIG. 4, which connects the second ink flow paths 226. In other words, the second ink flow path 226 passes through the common ink flow path 228, the other second ink flow path 226, the ink chamber 222 corresponding to the other second ink flow path 226, and the first one that connects the ink chamber 222. The ink flow path 224 is connected to the ink replenishing opening 212. Figure 9 is a partial enlarged view of Figure 3. Referring to Fig. 9, in the embodiment, the width D1 of the second ink flow path 226 is less than or equal to the width W1 of the ink chamber 222. Further, the sum of the width A1 of the common ink flow path 228 and the length Bi of the second ink flow path 226 is smaller than the distance u of the boundary between the ink chamber 222 and the ink barrier layer 220. Hereinafter, the same reference numerals denote the same or similar elements. In the embodiment of Fig. 3, the ink replenishing opening 212 is an elongated slot. However, in another embodiment of the present invention, the substrate 21GA of the ink jet printer 2A may have a plurality of ink replenishing openings 2 which are substantially perpendicular to the through holes of the substrate 210A, as shown in FIG. Show. These ink replenishing openings 212A are located on the outer sides of the inlet ends 22 of the first ink flow paths 224, respectively, for supplying ink. However, the form of the ink replenishing opening of the present invention is not limited to the ink supply opening 212 of the slit or the slit or the ink replenishing 212A of the through hole. 13 1329072 96001 24728 twf.doc/p Figure H illustrates an ink jet print head ' in accordance with yet another embodiment of the present invention and Figure 12 illustrates a partial enlargement of Figure 11 . Referring to FIG. 9 and FIG. 12, an ink barrier layer 22 of an inkjet print head 2 of another embodiment of the present invention preferably includes a plurality of return ink flow paths 229 for respectively respectively. Lane 226 is coupled to ink supplement opening 212. Thus, each return ink flow path 229 has a first end 229a and a second end 229b, and the first end 229a of the return ink flow path 229 is adjacent to the end of its corresponding second ink flow path 226 away from the ink chamber 222. 226a, and the second end 229b is adjacent to the ink replenishing opening 212. In one embodiment, the return ink flow path 229 includes a second segment 229m and a second segment 229n, wherein the second segment 229n of the return ink flow path 229 is substantially parallel to the second ink flow path 226. When the ink replenishing opening 212 is an elongated slit, as shown in Fig. 11, the second end portion 229m of the returning ink flow path 229 is substantially parallel to the extending direction of the ink replenishing opening 212. Figure 13 is a partial enlarged view of Figure 11. Referring to Figure 13, in the present embodiment, the width D2 of the second ink flow path 226 is less than or equal to the width W2 of the ink chamber 222. Further, the sum of the width A2 of the return ink flow path 229 and the length B2 of the second ink flow path 226 is smaller than the distance L2 of the boundary of the ink chamber 222 to the ink barrier layer 220B. In addition, the width A2 of the return ink flow path 229 is smaller than the distance e of the two adjacent second ink flow paths 226. In summary, the present invention employs a dual ink flow path to supply ink to the ink chamber' thereby accelerating the supply of ink, which helps to increase the print rate of the ink jet printhead. In addition, when the actuating element is a heating element, after the actuating element completes the ink-jetting operation, the ink will simultaneously flow back to the ink chamber from the ink flow path on the front and rear sides of the actuating element. At this time, the bubble will follow the ink to the ink. Both sides of the chamber 1329072 96001 24728twf.doc/p edge concentration. Since the bubbles are concentrated on both side edges of the ink chamber without impacting or accumulating on the actuating member, the life of the actuating member can be increased. The present invention has been disclosed in the above-described embodiments, and is not intended to limit the scope of the present invention, and may be modified and practiced without departing from the spirit and scope of the invention. The scope of protection of the present invention is therefore defined by the scope of the appended claims. In addition, any of the embodiments or advantages of the invention are not to be construed as being limited by the scope of the invention. In addition, the 2 headings are only used for searching for the exclusive parts, and _ to limit the scope of the application of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 illustrates a conventional ink jet print head. FIG. 2 is a partial enlarged view of FIG. 1. Figure 3 is a view showing an ink jet head according to an embodiment of the present invention. Figure 4 is a partial enlarged view of Figure 3 green. The ink flow direction when the actuating element of Fig. 3 operates. The flow of water: Ϊ will show the ink after the actuating element of Fig. 3 completes the ink operation. Fig. 9 shows another partial enlargement of Fig. 3. BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 shows a mouth ink head of another embodiment of the present invention. A further embodiment of the invention - an ink jet printhead. Figure 12 is a partial enlargement of Figure 11. 15 1329072 96001 24728 twf.doc/p Figure 13 depicts another partial enlargement of Figure 11. [Main component symbol description]

100: inkjet print head 110: substrate 112: ink replenishment opening 120: ink barrier layer 122: ink chamber 124: ink flow path 130: actuation element 142: injection hole 200, 200A, 200B: inkjet print head 210 210A: substrate 212, 212A: ink replenishing opening 220, 220B: ink barrier layer 222: ink chamber

222a: front end 222b: rear end 224: first ink flow path 224a: inlet end 224b: outlet end 226: second ink flow path 226a: end 228: common ink flow path 16 1329072 96001 24728twf.doc/p 229: return ink Flow passage 229a: first end 229b: second end 229m: first segment 229n: second segment

230: Actuating element 240: orifice sheet 242: orifice 800: bubble 900: ink droplet

Claims (1)

1329072 96001 24728twf.doc/p X. Patent application: 1. An ink guiding structure for guiding an ink to replenish the ink supplied by the opening. The ink guiding structure package includes an ink barrier layer. The method includes: a plurality of ink chambers formed in the ink barrier layer for storing ink; a plurality of first ink flow channels formed in the ink barrier layer, and respectively separating the ink chambers The end is connected to the ink replenishing opening, each of the first ink flow paths having an inlet end adjacent to the ink replenishing opening and an outlet port away from the inlet end and adjacent to the corresponding front end of the ink chamber, and each An inlet end of the first ink flow path is larger than an outlet end thereof; and a plurality of second ink flow paths are formed in the ink barrier layer, and respectively connect the rear ends of the ink chambers to the ink replenishing opening, The front end of each of the ink chambers is closer to the ink replenishing opening than the rear end thereof. 2. The ink guiding structure of claim 1, wherein the width of the ink passage is less than or equal to the width of the ink chamber. 3. The ink guiding structure of claim 1, wherein the ink barrier layer further comprises: a common ink flow path 'connecting the second ink flow paths, wherein the second ink flow paths are Passing through the common ink flow path, another second ink flow path, an ink chamber connecting the other ink flow path, and the third flow connecting the ink chamber to the ink supply Opening. 4. The ink guiding structure of claim 3, wherein the width of the common ink flow path and the length of the second ink flow path are in the ink chamber. The distance to the boundary of the ink barrier layer. 5. The ink guiding structure of claim 1, wherein the ink barrier layer further comprises: /, a plurality of returning ink flow paths, respectively connecting the second ink flow paths to the ink replenishing Opening. 6. The ink guiding structure of claim 5, wherein a sum of a width of the return ink flow path and a length of the second ink flow path is smaller than a boundary between the ink chamber and the ink barrier layer. distance. 7. The ink guiding structure of claim 5, wherein the width of the return ink flow path is less than the distance between two adjacent second ink flow paths. The ink guiding structure of claim 5, wherein each of the returning ink flow props has a first segment and a second segment, and the second segment is substantially parallel to the corresponding segment Two ink flow paths. 9. The ink guiding structure of claim 8, wherein the ink replenishing opening is an elongated slot, and the first segment of each of the returning ink channels is substantially parallel to the ink replenishing opening. Extend the direction. An inkjet printhead comprising: a substrate having at least one ink replenishing opening for supplying ink; an ink barrier layer disposed on the substrate, the ink barrier layer comprising: a plurality of inks a chamber formed in the ink barrier layer for storing ink; 19 1329072 96001 24728 twf.doc/p A plurality of first ink flow paths are formed in the ink barrier layer, and the ink chambers are respectively The front end is connected to the ink replenishing opening, each of the first ink flow paths having an inlet end adjacent to the ink replenishing opening and an _ outlet 远离 remote from the inlet end and adjacent to a corresponding front end of the ink chamber, and An inlet end of each of the first ink flow channels is larger than an outlet end thereof; and a plurality of second ink flow paths are formed in the ink barrier layer, and Separating the ink chamber rear end to the ink replenishing opening respectively, wherein each of the ink chamber front end is closer to the ink replenishing opening than the rear end thereof; and the plurality of actuating elements are respectively disposed in the ink chambers, a pressure source for use as an ink; and a orifice sheet disposed on the ink barrier layer and having a plurality of orifices respectively corresponding to the ink chambers. The ink jet print head of claim 10, wherein the substrate has a plurality of the ink replenishing openings ??? which are respectively located outside the inlet ends of the first ink flow paths. 12. The inkjet printhead of claim 10, wherein the width of the second ink flow path is less than or equal to the width of the ink chamber. 13. The inkjet printhead of claim 1, wherein the ink barrier layer further comprises: a common ink flow path 'connecting the two ink flow channels, wherein the second ink flow Passing the common ink flow path, another second ink flow path, an ink chamber connecting the other second ink flow path, and the first ink connecting the ink chamber 20 1329072 96001 24728 twf.doc/p chamber The flow path is connected to the ink to replenish Q. 14. The ink jet print head of claim 13, wherein the width of the common ink flow path and the length of the second ink flow path are = the boundary between the ink chamber and the ink barrier layer the distance. ' μ 15. The inkjet print head of claim 10, wherein the ink barrier layer further comprises: A plurality of return ink flow paths 'connect the second ink flow paths to the ink supply openings, respectively. 16. The inkjet printhead of claim 15, wherein a sum of a width of the return ink flow path and a length of the second ink flow path is smaller than a boundary between the ink chamber and the ink barrier layer. distance. The ink jet print head of claim 15, wherein the width of the return ink flow path is less than the distance between two adjacent second ink flow paths. The inkjet print head of claim 15, wherein each of the return ink flow props has a first segment and a second segment, and the second segment is substantially parallel to the corresponding second ink stream Road. 19. The inkjet printhead of claim 18, wherein the ink replenishing opening is an elongated slot, the first segment of each of the returning ink channels being substantially parallel to the extension of the ink replenishing opening direction. 20. The inkjet printhead of claim 15, wherein each of the return ink flow props has a first end and a second end, wherein the first end is adjacent to the corresponding second ink stream At one end of the track, the end is remote from its corresponding ink chamber ' and the second end is adjacent to the ink replenishing opening. An inkjet printhead comprising: 21 1329072 96001 24728 twf.doc/p a substrate having at least one ink replenishing opening for supplying ink; an ink barrier layer disposed on the substrate, the ink barrier The layer comprises: a plurality of ink chambers formed in the ink barrier layer for storing ink; a plurality of first ink flow paths 'formed in the ink barrier layer, respectively communicating the front ends of the ink chambers to the ink replenishing opening, each of the first ink flow paths having a first adjacent to the ink replenishing opening An inlet end and an outlet end away from the inlet end adjacent to the corresponding front end of the ink chamber, and a plurality of second ink flow paths 'formed in the ink barrier layer, respectively The rear end is connected to the ink replenishing opening, wherein the front end of each ink chamber is closer to the ink replenishing opening than the rear end thereof; a plurality of actuating elements are respectively disposed in the ink chambers to serve as a pressure source of ink ;as well as An orifice sheet is disposed on the ink barrier layer and has a plurality of orifices corresponding to the ink chambers respectively. Wherein the ink is from the corresponding ink when the actuation element performs an inkjet operation The chamber is ejected toward the corresponding nozzle and flows out from the first ink flow path and the second ink flow path before the ink chamber, respectively, when the actuating member completes the ink ejection operation. The ink flows from the first/ink flow path and the second ink flow path to the ink chambers at the front end and the rear end of the corresponding ink chamber, respectively. 22. The ink jet print head of claim 21, wherein the 22