JP6921565B2 - Liquid discharge head - Google Patents

Description

The present invention relates to a liquid discharge head, and more particularly to a configuration of a side wall that partitions each liquid chamber.

The member forming the discharge port of the liquid discharge head (hereinafter referred to as the discharge port forming member) may swell due to contact with the liquid or heat for a long period of time. The swelling of the discharge port forming member causes deformation of the discharge port. Specifically, by swelling the side walls of the discharge port forming member that partition the energy generating elements adjacent to each other, the distance from the substrate on which the energy generating elements are formed to the discharge port increases, and the discharge port diameter decreases. This may cause fluctuations in the discharge amount of the liquid discharged from the discharge port, deviation of the landing position, and the like, resulting in deterioration of image quality. Patent Document 1 discloses a liquid discharge head provided with a dividing portion on a side wall. According to such a configuration, the deformation of the side wall is absorbed by the divided portion, so that the deformation of the discharge port is alleviated.

U.S. Pat. No. 8,308,275

In the liquid discharge head described in Patent Document 1, of the two side walls defining the liquid chamber at the end of the liquid chamber arranged in a row, the inner side wall is provided with a dividing portion, but is outside. The side wall of the is not provided with a dividing portion. Since the outer side wall without the dividing portion is continuously extended, the deformation due to swelling is strongly restrained, but the deformation due to the swelling is absorbed by the dividing portion on the inner side wall provided with the dividing portion. NS. Therefore, the two side walls are deformed in different deformation modes, and as a result, the discharge port is likely to be tilted, and the landing position of the droplet may be displaced. On the other hand, since the two side walls that define the liquid chamber inside the liquid chambers arranged in a row are both provided with a dividing portion, the two side walls are deformed in almost the same deformation mode, and the discharge port Tilt is unlikely to occur. That is, in the liquid discharge head described in Patent Document 1, the deformation of the discharge port tends to vary depending on the position of the discharge port.

An object of the present invention is to provide a liquid discharge head capable of suppressing variations in deformation due to swelling of a plurality of discharge ports.

The liquid discharge head according to one aspect of the present invention includes an energy generating element that generates energy for discharging the liquid, a discharge port that is provided facing the energy generating element and discharges the liquid, and the energy generating element. A second liquid chamber including a liquid supply port for supplying a liquid to the liquid chamber, wherein the liquid supplied from the liquid supply port intersects a first direction toward the energy generating element. A plurality of first side walls that form a wall surface extending in the first direction shared by the adjacent liquid chambers by separately forming each of the plurality of liquid chambers arranged in the above direction and the plurality of liquid chambers. And the second side wall forming a dummy liquid chamber between the first side wall located at the end in the second direction, and the first side wall extending in the second direction, the first side wall. A third side wall that defines the liquid chamber and the dummy liquid chamber together with the second side wall,
The first side wall is narrower than the width of the first side wall at a position closer to the liquid supply port than the center of the discharge port in the first direction. It has a dividing portion that divides the first side wall in the first direction. Further, the liquid chamber further includes a liquid recovery port for recovering the liquid in a region ahead of the energy generating element in the first direction, and the first side wall is from the center of the discharge port. Also has another dividing portion that divides the first side wall in the first direction at a position close to the liquid recovery port with a dimension narrower than the width of the first side wall.

According to the present invention, it is possible to provide a liquid discharge head capable of suppressing variations in deformation of a plurality of discharge ports due to swelling.

It is a schematic plan view and sectional view of the liquid discharge head of the 1st Embodiment of this invention. It is a conceptual diagram which shows various shapes of a divided part. It is the schematic sectional drawing of the liquid discharge head of the comparative example. It is a schematic plan view of the liquid discharge head of the 2nd Embodiment of this invention. It is a schematic plan view of the liquid discharge head of the 3rd Embodiment of this invention. It is the schematic sectional drawing of the liquid discharge head of the comparative example. It is a figure which shows an example of the relationship between the position of a dividing part and the deformation of a discharge port. It is a schematic plan view of the liquid discharge head of the 4th Embodiment of this invention. It is a conceptual diagram which shows various shapes of the cross-section reduction part.

Hereinafter, some embodiments of the present invention will be described with reference to the drawings. In the liquid discharge head of the embodiment described below, a thermal method in which bubbles are generated by a heat generating element to discharge ink is adopted, but the liquid discharge head in which the piezo method and various other liquid discharge methods are adopted is used. The present invention can also be applied. Although the liquid ejection head of the present embodiment ejects ink, the present invention can also be applied to a liquid ejection head that ejects a liquid other than ink. In the following embodiments, the first direction X refers to the direction in which ink flows in the liquid chamber or the direction in which the first side wall extends, and the second direction Y refers to the direction in which a plurality of liquid chambers are arranged. In each of the following embodiments, the second direction Y is orthogonal to the first direction X, but it does not have to be orthogonal and may intersect.

(First Embodiment)
1 (a) is a schematic partial plan view of the liquid discharge head according to the first embodiment of the present invention, and FIG. 1 (b) is a cross-sectional view taken along the line AA of FIG. 1 (a). .. The first direction X corresponds to the width direction of the recording medium, and the second direction Y corresponds to the transport direction of the recording medium.
The liquid discharge head 101 has a substrate 1 and a discharge port forming member 4 formed on the substrate 1. The substrate 1 is made of silicon, and the discharge port forming member 4 is made of resin. In the present embodiment, a discharge port forming member composed of a resin member that is easily affected by heat and swelling will be described, but the present invention is not limited thereto. The present invention can also be applied to a discharge port forming member made of an inorganic material such as silicon or a metal material such as stainless steel. A plurality of energy generating elements 2 for generating energy for discharging a liquid are formed on the substrate 1. The energy generating element 2 includes a heat generating resistor that generates heat when an electric current is applied. The substrate 1 is formed with a plurality of liquid supply ports 3a for supplying ink and a plurality of liquid recovery ports 3b for collecting ink. The liquid recovery port 3b is provided on the opposite side of the liquid supply port 3a with respect to the energy generating element 2. The liquid supply port 3a and the liquid recovery port 3b are through holes penetrating the substrate 1 in the thickness direction, and are connected to a common liquid flow path (not shown). The plurality of energy generating elements 2, the plurality of liquid supply ports 3a, and the plurality of liquid recovery ports 3b are arranged in a row in the second direction Y, respectively.

The discharge port forming member 4 is joined to a plurality of first side walls 11 extending in the first direction X, two third side walls 13 extending in the second direction Y, and the first and first side walls 11. It has a top plate 14 joined to the third side walls 11 and 13. The plurality of first side walls 11 are arranged in the second direction Y. A plurality of ejection ports 8 for ejecting ink are formed on the top plate 14 so as to face each energy generating element 2. A plurality of first side walls 11, a third side wall 13, and a top plate 14 provided with an energy generating element 2, a liquid supply port 3a, and a liquid recovery port 3b between the discharge port forming member 4 and the substrate 1, respectively. Liquid chamber 7 is formed. The plurality of liquid chambers 7 are arranged in the second direction Y. Each liquid chamber 7 is defined by two first side walls 11 and two third side walls 13 adjacent to each other. That is, the wall surfaces on both sides of each liquid chamber 7 extending in the first direction X are formed by the two first side walls 11 sandwiching the liquid chamber 7, and the wall surfaces on both sides extending in the second direction Y are the liquid chambers 7. It is formed by two third side walls 13 sandwiching the above. The liquid chamber 7 includes a pressure chamber 6 in which the energy generating element 2 is formed, a liquid supply path 5a opened by the liquid supply port 3a, and a liquid recovery path 5b opened by the liquid recovery port 3b. The liquid chamber 7 is formed symmetrically with respect to a line extending in the second direction Y through the center of the energy generating element 2 to the discharge port 8, and the liquid supply port 3a and the liquid recovery port 3b are also formed symmetrically with respect to the above line. Has been done. The pressure chamber 6 is a region sandwiched between two first side walls 11 and provided with an energy generating element 2, and more broadly, a region on which pressure acts when the energy generating element 2 is driven.

The ink flows in each liquid chamber 7 in the first direction X. That is, the ink flows into the liquid supply path 5a from the liquid supply port 3a, passes through the pressure chamber 6 and the liquid recovery path 5b, and flows out from the liquid recovery port 3b. For this reason, it becomes difficult for the thickened ink due to evaporation of water to stay in the vicinity of the ejection port 8, which leads to improvement in image quality. A second liquid supply port may be provided instead of the liquid recovery port 3b. In this case, since the ink is supplied to the pressure chamber 6 from two directions, the ink supply capacity is improved and high-speed printing is facilitated.
Although the first side wall 11 is shared by the liquid chambers 7 adjacent to each other, each liquid chamber 7 may have a separate first side wall 11. In this case, the liquid chambers 7 and the spaces where the ink does not flow in are alternately arranged.

The top plate 14 is a flat plate that extends substantially parallel to the substrate 1 and is joined or integrated with a plurality of first side walls 11 and two third side walls 13. A plurality of through holes 10 penetrate the top plate 14, and a discharge port 8 is formed on the side of each through hole 10 opposite to the liquid chamber 7, that is, at one end facing the recording medium. The discharge port 8 faces the energy generating element 2 in a direction perpendicular to the surface of the substrate 1 facing the discharge port forming member 4. By driving the energy generating element 2, bubbles are generated in the ink, and the ink in the through hole 10 is pushed out by the pressure at the time of foaming and is discharged from the discharge port 8.

The discharge port forming member 4 has two second side walls 12 connected to a first side wall 11 located at an end in the second direction Y. The second side wall 12 is also connected to the third side wall 13. The second side wall 12 forms a dummy liquid chamber 17 with the first side wall 11 at the end. A liquid supply port 3a and a liquid recovery port 3b are also formed in the dummy liquid chamber 17, and ink flows in and out. However, since the second side wall 12 extends continuously and is not provided with the dividing portion 9 described later, it is possible to prevent ink from leaking from the dummy liquid chamber 17 to the outside of the liquid ejection head 101. The dummy liquid chamber 17 is provided with a dummy element 22 that is not driven, and does not contribute to ink ejection. Alternatively, the dummy liquid chamber 17 does not have to be provided with the energy generating element 2 or the dummy element 22.

All the first side walls 11 have two dividing portions 9 that divide the first side wall 11 in the first direction X. The two dividing portions 9 are provided at positions equidistant from the center of the discharge port 8 on both sides of the discharge port 8 with respect to the first direction X. The dividing portion 9 has the shape of a slit, but the shape is not particularly limited. The separation portion 9 is, for example, a linear slit 9a extending in the second direction Y shown in FIG. 2A and a linear slit 9b extending in a direction inclined from the second direction Y shown in FIG. 2B. It may be there. The separation portion 9 may be a slit 9c in which the interval of the first direction X shown in FIG. 2C changes along the second direction Y, or a polygonal slit 9d shown in FIG. 2D.

When the liquid chamber 7 is filled with ink and the discharge port forming member 4 is deformed by swelling, the configuration of the first side wall 11a at the end and the first side wall 11b inside the first side wall 11a is different in the conventional liquid discharge head. , As shown in FIG. 3, the discharge port 8 at the end is deformed obliquely with respect to the substrate 1. Here, FIG. 3A shows a cross-sectional view of a conventional liquid discharge head, and FIG. 3B shows an enlarged view of part A of FIG. 3A. Specifically, the deformation of the first side wall 11a at the end is strongly restrained in the first direction X, and the first side wall 11b one inside the first side wall 11b is provided with the dividing portion 9, so that the end portion is the first. It is less likely to be restrained than the side wall 11a of 1. Therefore, the discharge port 8 at the end is deformed so as to be inclined toward the first side wall 11b on the inner side. That is, the inner end 8b is deformed so as to drop with respect to the outer end 8a in the second direction Y of the discharge port, and a height difference H is generated. On the other hand, since the first side walls 11 on both sides of the inner discharge port 8 both have a dividing portion 9, the inner discharge port 8 is deformed so as to swell in a direction away from the substrate 1 as a whole, but is obliquely formed in the second direction Y. It doesn't tilt much. As a result, only the ejection port 8 at the end is greatly deformed diagonally, the central axis 10a of the through hole 10 is tilted with respect to the substrate 1, and the landing position of the ink droplet is displaced.

In the present embodiment, as described above, the dummy liquid chamber 17 is provided outside the liquid chamber 7 at the end. Therefore, the divided portion 9 can be provided on the first side wall 11 at the end in the second direction Y as well as the other first side wall 11. Since the first side walls 11 on both sides can have the same configuration for all the discharge ports 8, the above-mentioned problem can be solved and the inclination of all the discharge ports 8 can be reduced.

The dividing portion 9 is provided at the same position for all the first side walls 11. That is, the dividing portions 9 provided on the first side wall 11 are provided on a straight line with respect to the Y direction in FIG. Therefore, for all the discharge ports 8, the configuration of the discharge port forming member 4 around the discharge port 8 is symmetrical on both sides of the discharge port 8. As a result, all the discharge ports 8 are deformed in substantially the same mode so that they can be lifted in parallel with the substrate 1, and variations in the inclination of the discharge ports 8 can be suppressed. Therefore, in the liquid discharge head 101 of the present embodiment, the central axes 10a of the plurality of through holes 10 extend substantially vertically from the substrate 1 even when the discharge port forming member 4 is swollen with ink.

In the embodiment shown in FIG. 1, the discharge port 8, the liquid supply port 3a, and the liquid recovery port 3b are arranged at 600 dpi in the second direction Y. The width W of the pressure chamber 6 is 30 μm, the width T of the first side wall 11 is 12 μm, the diameter of the discharge port 8 is 20 μm, and the length L of the first direction X from the center of the discharge port 8 to the end of the liquid chamber 7. Is 90 μm, and the opening width S of the dividing portion 9 is 5 μm. When the dividing portion 9 is located near the discharge port 8, the influence of crosstalk by the adjacent discharge port 8 becomes large. Therefore, the dividing portion 9 is provided at a position closer to the liquid supply port 3a than the center of the discharge port 8 in the first direction X. In order to further alleviate the influence of crosstalk, the opening width S of the dividing portion 9 is preferably 10 μm or less, and more preferably 5 μm or less. As described above, in the present embodiment, it is possible to suppress the deformation of the discharge port 8 due to swelling while suppressing the influence of crosstalk, and to realize high-quality printing.

(Second embodiment)
FIG. 4A shows a schematic partial plan view of the liquid discharge head 201 of the second embodiment of the present invention. In the second embodiment, the discharge ports 8 are arranged in the width direction of the recording medium. That is, the second direction Y corresponds to the width direction of the recording medium. The liquid chamber 7 has a dead end on the opposite side of the liquid supply port 3a with respect to the energy generating element 2, and the liquid recovery port 3b is omitted. The first side wall 11 is provided with only one dividing portion 9 between the liquid supply port 3a and the discharge port 8. The discharge port 8 and the liquid supply port 3a are arranged at 600 dpi in the second direction Y. The configuration, effects, and the like, which are omitted from the description, are the same as those in the first embodiment.

Also in the present embodiment, the dividing portion 9 can suppress the deformation of the discharge port 8 due to the swelling of the discharge port forming member 4, particularly the inclination of the discharge port 8 in the second direction Y. The effect of suppressing the deformation of the discharge port 8 is higher as the divided portion 9 is closer to the discharge port 8, and becomes smaller as the divided portion 9 is separated from the discharge port 8. Similar to the first embodiment, by setting the opening width S of the dividing portion 9 to 10 μm or less, preferably 5 μm or less, the influence of crosstalk on the adjacent discharge port 8 can be suppressed while suppressing the deformation of the discharge port 8. The liquid discharge head 201 can be realized. In the present embodiment, since the third side wall 13 is in the vicinity of the discharge port 8, it is difficult to suppress the deformation of the discharge port 8 in the first direction X. However, while it is difficult to correct the ink landing position in the second direction Y, the ink landing position in the first direction X can be easily corrected by adjusting the printing conditions or the like.

As shown in FIG. 4B, the first side wall 11 may be separated from the third side wall 13 adjacent to the energy generating element 2. The separating portion 16 and the dividing portion 9 of the first side wall 11 are provided at positions equidistant from the discharge port 8 on both sides of the discharge port 8 with respect to the first direction X. Depending on the length of the pressure chamber 6, two dividing portions 9 may be provided on the first side wall 11. Since the first side wall 11 is separated from the third side wall 13, the effect of suppressing the deformation of the discharge port 8 in the first direction X can be obtained. Although the influence of crosstalk becomes large, the influence of crosstalk can be reduced by narrowing the opening width S of the dividing portion 9 to 5 μm or less.

(Third Embodiment)
FIG. 5 shows a schematic partial plan view of the liquid discharge head 301 according to the third embodiment of the present invention. In the present embodiment, one liquid chamber 7 has one liquid supply port 3a, a plurality of energy generating elements 2 (two in the embodiment), and a plurality of energy generating elements 2 facing each energy generating element 2 (2 in the embodiment). One) The discharge port 8 is provided. In the present embodiment, the discharge port 8 is arranged at 600 dpi in the second direction Y, and the ink liquid supply port 3a, the liquid recovery port 3b, and the first side wall 11 are arranged at 300 dpi in the second direction Y. A filter 18 is arranged between the energy generating element 2 and the liquid supply port 3a. Since the opening area of the liquid supply port 3a is increased and ink is supplied to the plurality of pressure chambers 6 as compared with the first embodiment, the energy generating element 2 can be driven at a higher speed.

A plurality of energy generating elements 2 in one liquid chamber 7 are separated from each other by a partition wall 15 extending in the first direction X. The partition wall 15 is installed in the pressure chamber 6, and is not installed in the liquid supply port 3a and the liquid recovery port 3b. Therefore, the partition wall 15 is separated from the third side wall 13. The partition wall 15 is formed symmetrically with respect to a line extending in the second direction Y through the center of the energy generating element 2 or the discharge port 8. In the present embodiment, since the first side wall 11 is on one side of the discharge port 8 and the partition wall 15 is on the other side, the asymmetry around the discharge port 8 is larger than that in the first embodiment. FIG. 6 shows the deformation of the discharge port 8 when the first side wall 11 does not have the dividing portion 9. The deformation of the first side wall 11 is strongly constrained in the first direction X, and the partition wall 15 is less constrained than the first side wall 11. Therefore, the discharge port 8 is deformed so as to be inclined toward the partition wall 15. Since the first side wall 11 and the partition wall 15 are arranged alternately, the inclination direction of the discharge port 8 is opposite for each discharge port 8. As a result, the ink ejection direction is also opposite for each ejection port 8, and the print quality tends to deteriorate. However, by providing the dividing portion 9 on the first side wall 11, the asymmetry can be alleviated and the inclination of the discharge port 8 can be suppressed.

FIG. 7 shows the discharge port 8 when the distance from the center of the discharge port 8 to the dividing portion 9 in the first direction X is D, and the half value of the length of the partition wall 15 in the first direction X is P [μm]. It shows the change of the height difference H in. The opening width S of the dividing portion 9 was set to 2 μm. The height difference H in the configuration without the dividing portion 9 is set to 100%. The distance D is most effective near D = 0.86P. When D = P and D = 0.72P, the height difference H can be reduced to about 20%. Therefore, it is desirable that 0.7P ≦ D ≦ P. When the dividing portion 9 is in the vicinity of the discharge port 8, if the opening width S is too wide, it is easily affected by the crosstalk of the adjacent discharge port 8. However, by setting the opening width S to S <10 μm, preferably S <5 μm, the influence of crosstalk can be suppressed. When the dividing portion 9 overlaps with the liquid supply port 3a in the first direction X, the influence of crosstalk is hardly generated even if the opening width S is 5 μm or more because it is absorbed by the ink liquid supply port 3a. As described above, also in this embodiment, it is possible to suppress the deformation of the discharge port 8 and the influence of crosstalk, and it is possible to realize high-quality printing.

Although the dummy liquid chamber 17 is shown in FIG. 5, a configuration different from that of the dummy liquid chamber 17 can be applied. Specifically, a partition wall 15 is provided between two dummy elements 22 provided in the liquid chambers at both ends of FIG. Then, the element 22 on the end side is left as the dummy element 22 and is not used for recording, and the dummy element 22 on the center side of the dummy element 22 on the end side is recorded as the energy generating element 2. Used for. The configuration, effects, and the like, which are omitted from the description, are the same as those in the first embodiment. In the present invention, there is a liquid supply port 3a for supplying a liquid to a pressure chamber 6 including an energy generating element 2 inside, and a liquid recovery for recovering the liquid in the pressure chamber 6, as shown in FIGS. 1 and 5. It is suitably applicable to a liquid discharge head provided with a port 3b. In such a configuration in which the liquid in the pressure chamber or the liquid chamber is circulated with the outside thereof, the influence on the swelling of the discharge port forming member is large, and therefore the application of this configuration is particularly suitable.

(Fourth Embodiment)
FIG. 8A shows a schematic partial plan view of the liquid discharge head 401 according to the fourth embodiment of the present invention. In the fourth embodiment, the discharge ports 8 are arranged in the width direction of the recording medium. That is, the second direction Y corresponds to the width direction of the recording medium. The liquid chamber 7 has a dead end on the opposite side of the liquid supply port 3a with respect to the energy generating element 2, and the liquid recovery port 3b is omitted. The first side wall 11 is provided with only one dividing portion 9 between the liquid supply port 3a and the discharge port 8. In the present embodiment, one liquid chamber 7 has one liquid supply port 3a, a plurality of energy generating elements 2 (two in the embodiment), and a plurality of energy generating elements 2 facing each energy generating element 2 (2 in the embodiment). One) The discharge port 8 is provided. The discharge port 8 is arranged at 600 dpi in the second direction Y, and the liquid supply port 3a is arranged at 300 dpi in the second direction Y. The configuration, effects, and the like, which are omitted from the description, are the same as those in the first embodiment.

Also in the present embodiment, the dividing portion 9 can suppress the deformation of the discharge port 8 due to the swelling of the discharge port forming member 4, particularly the inclination of the discharge port 8 in the second direction Y. The effect of suppressing the deformation of the discharge port 8 is higher as the divided portion 9 is closer to the discharge port 8, and becomes smaller as the divided portion 9 is separated from the discharge port 8. Similar to the first embodiment, by setting the opening width S of the dividing portion 9 to 10 μm or less, preferably 5 μm or less, the influence of crosstalk on the adjacent discharge port 8 is suppressed while suppressing the deformation of the discharge port 8. The liquid discharge head 401 can be realized. In the present embodiment, since the third side wall 13 is in the vicinity of the discharge port 8, it is difficult to suppress the deformation of the discharge port 8 in the first direction X as compared with the first embodiment. However, while it is difficult to correct the ink landing position in the second direction Y, the ink landing position in the first direction X can be easily corrected by adjusting the printing conditions or the like.

As shown in FIG. 8B, the first side wall 11 and the partition wall 15 may be separated from the third side wall 13 adjacent to the energy generating element 2. Since the first side wall 11 and the partition wall 15 are separated from the third side wall 13, the effect of suppressing the deformation of the discharge port 8 in the first direction X can be obtained. Although the influence of crosstalk becomes large, the influence of crosstalk can be reduced by narrowing the opening width of the dividing portion 9 to 5 μm or less. In FIG. 8B, as in the third embodiment, the element 22 on the end side of the two dummy elements 22 in the liquid chamber 17 is left as the dummy element 22, and the dummy element on the center side is left as it is. It is also possible to change 22 to the energy generating element 2 and use it for recording.

Although some embodiments of the present invention have been described above, the present invention can replace a part or all of the divided portion 9 with a cross-section reduced portion whose cross section perpendicular to the first direction X is reduced. As the cross-sectional reduction portion, the linear cross-section reduction portion 19a shown in FIG. 9A, the polygonal cross-section reduction portion 19b shown in FIG. 9B, and the cross-sectional area shown in FIG. 9C gradually change. A cross-section reduction portion 19c or the like can be adopted. Unlike the dividing portion 9, the first side wall 11 is continuously formed, and ink does not flow into the adjacent liquid chamber 7 from the dividing portion 9, so that the influence of crosstalk can be further reduced. Further, since it is not necessary to provide the dummy liquid chamber 17 for preventing the ink from leaking to the outside of the liquid discharge head, it also contributes to the miniaturization and cost reduction of the liquid discharge head. The effect of suppressing the deformation of the discharge port 8 is smaller than that of the dividing portion 9, but the effect of suppressing the deformation of the discharge port 8 is obtained as compared with the first side wall not provided with the dividing portion 9 or the cross-section reducing portion. Be done.
According to the present invention, it is possible to provide a liquid discharge head capable of suppressing variations in deformation of a plurality of discharge ports due to swelling.

2 Energy generating element 3a Liquid supply port 7 Liquid chamber 8 Discharge port 9 Divided part 11 First side wall X First direction Y Second direction

Claims (15)

It is provided with an energy generating element for generating energy for discharging a liquid, a discharge port provided facing the energy generating element for discharging the liquid, and a liquid supply port for supplying the liquid to the energy generating element. The liquid chamber is a liquid chamber in which a plurality of liquid chambers are arranged in a second direction in which the liquid supplied from the liquid supply port intersects the first direction toward the energy generating element.
A plurality of first side walls that are configured by dividing each of the plurality of liquid chambers and form a wall surface extending in the first direction shared by the adjacent liquid chambers.
A second side wall forming a dummy liquid chamber with the first side wall located at the end in the second direction, and a second side wall.
A third side wall extending in the second direction and defining the liquid chamber and the dummy liquid chamber together with the first side wall and the second side wall.
It is a liquid discharge head equipped with
The first side wall has a dimension narrower than the width of the first side wall at a position closer to the liquid supply port than the center of the discharge port in the first direction. It has a dividing part that divides in the direction, and also has a dividing part .
The liquid chamber further includes a liquid recovery port for recovering the liquid in a region ahead of the energy generating element in the first direction, and the first side wall is more than the center of the discharge port. A liquid discharge head characterized by having another dividing portion that divides the first side wall in the first direction at a position close to the liquid recovery port with a dimension narrower than the width of the first side wall. The first aspect of claim 1, wherein the dividing portion near the liquid supply port and the other dividing portion near the liquid recovery port are provided at equidistant positions from the center of the discharge port. Liquid discharge head. The liquid chamber includes one liquid supply port, one liquid recovery port, two energy generation elements, and two discharge ports provided facing each of the two energy generation elements. The liquid discharge head according to claim 1 or 2 , further comprising a partition wall that separates the two energy generating elements and does not reach the liquid supply port and the liquid recovery port. When the half value of the length of the partition wall in the first direction is P and the distance from the center of the discharge port to the divided portion in the first direction is D, 0.7P ≦ D ≦ P. , The liquid discharge head according to claim 3. Any of claims 1 to 4 , wherein a filter is arranged between the energy generating element and the liquid supply port and between the energy generating element and the liquid recovery port in the liquid chamber. The liquid discharge head according to item 1. Any one of claims 1 to 5 , wherein the liquid in the liquid chamber is circulated to the outside of the liquid chamber in the order of the liquid supply port, the energy generating element, and the liquid recovery port. The liquid discharge head described in. The liquid discharge head according to any one of claims 1 to 6 , wherein a second liquid supply port for supplying the liquid is provided in place of the liquid recovery port. It is provided with an energy generating element for generating energy for discharging a liquid, a discharge port provided facing the energy generating element for discharging the liquid, and a liquid supply port for supplying the liquid to the energy generating element. The liquid chamber is a liquid chamber in which a plurality of liquid chambers are arranged in a second direction in which the liquid supplied from the liquid supply port intersects the first direction toward the energy generating element.
A plurality of first side walls that are configured by dividing each of the plurality of liquid chambers and form a wall surface extending in the first direction shared by the adjacent liquid chambers.
A second side wall forming a dummy liquid chamber with the first side wall located at the end in the second direction, and a second side wall.
A third side wall extending in the second direction and defining the liquid chamber and the dummy liquid chamber together with the first side wall and the second side wall.
It is a liquid discharge head equipped with
The first side wall has a dimension narrower than the width of the first side wall at a position closer to the liquid supply port than the center of the discharge port in the first direction. It has a dividing part that divides in the direction,
The liquid chamber includes one liquid supply port, two energy generating elements, and two discharging ports provided so as to face each of the two energy generating elements, and the two energies. partitioned between generating element, a liquid discharge head you further comprising a barrier not reach the liquid supply port. The liquid discharge according to any one of claims 1 to 8 , wherein the plurality of dividing portions provided on the plurality of the first side walls are provided in a straight line with respect to the second direction. head. The liquid discharge head according to any one of claims 1 to 9 , wherein the dummy liquid chamber is not provided with the energy generating element. The liquid discharge head according to any one of claims 1 to 9 , wherein a dummy energy generating element that is not driven is provided in the dummy liquid chamber. The dummy liquid chamber has two dummy energy generating elements, two openings provided opposite to each of the two dummy energy generating elements, and the liquid toward the two dummy energy generating elements. and one of said liquid supply port for sending the liquid discharge head according to claim 1 1, characterized in that and a liquid recovery port for recovering the liquid. The divided between two energy generating elements, the liquid discharge head according to claim 1 2, characterized in that it comprises a partition wall which does not reach to the liquid inlet and the liquid recovery port. Of the two dummy energy generating elements, the energy generating element on the end portion side without the recording, to claim 1 2 or 13 energy generating elements on the inside, characterized in that used for recording The liquid discharge head described. The liquid discharge head according to any one of claims 1 to 14 , further comprising a cross-section reduction portion in which a cross section perpendicular to the first direction is reduced by replacing a part or all of the division portion. ..

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