JP2007301951A - Inkjet recording head and inkjet recording device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an inkjet recording head which can reduce the intrusion of different inks into nozzles even if a recovery action is made. <P>SOLUTION: A discharge openings separation area E1 for separating discharge openings N1 from discharge openings N2 is formed on the discharge openings forming surface F1 of a recording head, and an ink blocking portion R2, which blocks the flow of inks between the discharge openings N1 and N2, is formed in the discharge openings separation area E1. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an inkjet recording head that performs recording on a recording medium by discharging a plurality of types of ink, and an inkjet recording apparatus using the inkjet recording head.

  An ink jet recording apparatus performs recording by ejecting fine ink droplets from a plurality of ejection ports provided in a recording head, and depositing the ink droplets on a recording medium. For this reason, the ink jet recording apparatus has the advantages of low running cost, excellent quietness during recording, and relatively easy color recording by using a plurality of colors of ink. In addition, a so-called bubble jet (registered trademark) system using a bubble generating element such as a heater as a pressure generating element for ejecting ink droplets is relatively easy to arrange the bubble generating elements at high density. This is an advantageous system for high-resolution recording.

  Color recording by the ink jet recording apparatus can be realized by providing in the apparatus the same number of recording heads as the type of ink to be used. However, in this case, there is a problem that providing a separate recording head leads to an increase in size and cost of the recording apparatus. As a method for solving this problem, Patent Document 1 discloses a configuration in which a plurality of colors of ink are ejected from a single recording head.

  FIG. 13 is a longitudinal sectional front view showing the structure of the common liquid chamber of the recording head in Patent Document 1. In FIG. The recording head shown here has a configuration in which a heater board 100 in which electrothermal transducers are arranged on a silicon substrate and a resin-made grooved top plate 130 are combined. Specifically, a grooved top plate 130 formed with a recess is pressed against the upper surface of the heater board 100, and a plurality of common liquid chambers 110 a, partitioned by the heater board 100 and the grooved top plate 130, 110b, 110c, and 110d are formed. Since different types of ink are supplied to the plurality of liquid chambers, it is necessary to block the permeation and diffusion of the ink between the common liquid chambers. Therefore, separation grooves 113a, 113b, and 113c are formed in the contact portion between the grooved top plate 130 and the heater board 100, and the sealant 120 is introduced into the separation grooves, so that ink between the common liquid chambers can be obtained. Blocks the penetration and diffusion of In addition, the grooved top plate 130 is formed with ink channels and discharge ports communicating with the common liquid chambers 110a to 110d at a predetermined density, and an electrothermal converter is disposed in each ink channel. ing. In the following description, the term “nozzle” includes an ink flow path, a discharge port, and a foam element.

  According to Patent Document 1, it is possible to discharge a plurality of types of ink from a single recording head, and the recording head can be manufactured in a small size and at low cost. Also, by using this recording head, it is possible to avoid an increase in the size of the recording apparatus.

JP-A-7-148926

  However, since the recording head described in Patent Document 1 is provided with different ink ejection openings on the same plane, different inks are ejected when a recovery operation is performed in order to maintain the ejection performance of the recording head. It may invade inside. For example, when the ink in the nozzle is discharged by suction recovery or pressure recovery, the discharged ink may enter the discharge port of different ink along the discharge port formation surface. In the so-called wiping recovery in which the ejection port forming surface is wiped with a blade, the ink wiped off by the blade may enter different ink ejection ports. In such a case, color mixing occurs in the ink ejected from the ejection port, and the quality of the formed image is lowered. Therefore, conventionally, a large amount of ink must be discharged in the preliminary ejection, resulting in an increase in running cost. It is.

  The present invention has been made for the purpose of solving the conventional problems as described above. That is, an object of the present invention is to provide an ink jet recording head that can reduce the penetration of different types of ink into nozzles even when a recovery operation or the like is performed.

  In order to solve the above problems, the present invention has the following configuration.

  That is, according to the first aspect of the present invention, a plurality of ejection port groups formed by arranging a plurality of ejection ports for ejecting ink are arranged on a single ejection port forming surface, and different inks are ejected from the ejection port groups. In the above-described ink jet recording head, an ejection port group separation region for separating the ejection port groups is formed on the ejection port forming surface, and ink between the ejection port groups is formed in the ejection port group separation region. An ink blocking part for blocking the flow is formed.

  According to a second aspect of the present invention, there is provided an ink jet recording apparatus that performs a recording operation using the above ink jet recording head.

  In the ink jet recording head according to the present invention, the ink deposited on the discharge port forming surface is moved to the adjacent discharge port group by the recess formed in the region between the plurality of discharge port groups formed on the discharge port forming surface. Infiltration can be suppressed. For this reason, it is possible to reduce the color mixture of the ink ejected from different ejection ports, and it is possible to form a high-quality image.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
(First embodiment)
FIG. 1 is a perspective view showing an inkjet recording head H (hereinafter simply referred to as a recording head) to which the present invention is applied.
In FIG. 1, reference numeral 1 denotes a ceramic plate 1 constituting the bottom of the recording head H. Disposed on the ceramic plate 1 are an ejection element 4 that ejects ink droplets, and a flow path forming member (third member) 2 that covers the left and right side surfaces and the upper surface of the ejection element 4. In the recording head H, a plurality of nozzles for ejecting ink are arranged at a predetermined density, and a plurality of common liquid chambers (not shown in FIG. 1) communicating with the nozzles are formed. Each common liquid chamber is supplied with a plurality of types of ink supplied from an ink tank (not shown) through an ink supply port 3a provided in the flow path forming member 2, and the ink supplied to each common liquid chamber is: The ink is guided into an ink flow path (not shown in FIG. 1) communicating with each common liquid chamber. In each ink flow path, a bubble generating element (not shown in FIG. 1) for generating bubbles by heating ink is disposed. Ink in the flow path is ejected outward from an ink ejection port (not shown in FIG. 1) by the pressure at the time of bubble generation.

Next, the internal structure of the recording head H will be described in more detail based on the exploded perspective view of FIG.
The discharge element 4 provided above the ceramic plate 1 includes a heater board (substrate) 5 fixed to the upper surface of the ceramic plate 1 and a nozzle wall forming portion (second member) fixed to the upper surface of the heater board 5. ) 6 and a separation plate (third member) 8 fixed to the upper surface of the nozzle wall forming portion 6.

  The heater board 5 has a plurality of electrothermal conversion elements (heaters) as foaming elements arranged on a silicon substrate. The nozzle wall forming portion 6 includes a plurality of discharge ports 6a that constitute a nozzle that discharges ink droplets and a plurality of liquid passages 6b that communicate with the nozzles, and a plurality of fluid passages that communicate with the liquid passage 6b. The openings 6c (four openings in the figure) are formed. These openings 6c form spaces 6f that open upward together with the upper surface of the heater board 5 positioned below. Further, in the nozzle wall forming portion 6, a first sealant filling groove 6e is formed on the upper surface of the divided portion 6d that separates the openings 6c.

  The separation plate 8 is formed of a silicon substrate, and is fixed to the upper surface of the nozzle wall forming portion 6 via a sealant introduced into the first sealant filling groove 6 e of the nozzle wall forming portion 6. The separation plate 8 is formed with a plurality of (four) openings 8 a communicating with the openings 6 c formed in the nozzle wall forming portion 6. Each opening 8 a communicates with each opening 6 c of the nozzle wall forming portion 6 in a state where the separation plate 8 is fixed to the upper surface of the nozzle wall forming portion 6. Further, on the upper surface of the separation plate 8, a second sealant filling groove 8c is formed in the divided region 8b located between the openings 8a, and a second side along one side of each opening 8a. A sealant filling groove 8d is formed. These second sealant filling grooves 8c and 8d may be provided one for each divided region 8b as shown in FIG. 2, but as shown in FIG. If a plurality of sealant filling grooves 8c and 8d are provided, the common liquid chamber separation effect described later is further enhanced.

Further, the flow path forming member 2 is fixed via a sealant applied to the upper surface of the separation plate 8. The flow path forming member 2 is disposed on the ceramic plate 1 so as to cover the left and right side portions of the heater board 5, the nozzle wall forming portion 6 and the separation plate 8. In addition, a plurality of concave spaces 2 a (four in this case) are formed on the inner surface of the flow path forming member 2. The space 2 a communicates with each opening 8 a formed in the separation plate 8 in a state where the flow path forming member 2 is fixed to the upper surface of the separation plate 8. Further, on the back side of the flow path forming member 2, a connecting pipe 3 in which an ink supply port 3 a that communicates with each upper supply liquid chamber 2 a is formed. Different types (colors) of ink tanks (not shown) are connected to the connection pipe 3.
A wiring board 7 connected to the heater board 6 by wire bonding is disposed on the ceramic plate 1. The wiring board 7 is electrically connected to a carriage provided in the recording apparatus.

  As described above, in the recording head in this embodiment, the four spaces 2 a formed in the flow path forming member 2 and the four spaces formed in the nozzle wall forming portion 6 are formed in the separation plate 8. The four openings 8a communicate with each other. As a result, four independent spaces are formed, and these spaces serve as a common liquid chamber. In the following description, the space 2a located above the opening of the separation plate 8 in each common liquid chamber is referred to as an upper common liquid chamber, and the space 6f located below is referred to as a lower common liquid chamber.

  By the way, different types (for example, colors) of ink are supplied to the common liquid chambers formed in the recording head. Accordingly, it is necessary to block the permeation / diffusion of ink between adjacent common liquid chambers and to reliably separate the ink supplied to each common liquid chamber. Therefore, in the present embodiment, the separation plate 8 is interposed between the flow path forming member 2 constituting the upper common liquid chamber 2a and the nozzle wall forming portion 6 constituting the lower common liquid chamber 6f. The common liquid chamber can be properly separated.

Hereinafter, the separation structure of the common liquid chambers in the recording head of the present embodiment will be described in detail with reference to FIGS.
First, the separation between the upper common liquid chambers will be described with reference to FIGS. 4 schematically shows a longitudinal side surface when the recording head H is cut along the cutting line AA ′ shown in FIG. 3, and FIG. 5 shows a cutting line BB ′ shown in FIG. FIG.

  Separation between the plurality of upper common liquid chambers 2a is performed by applying a sealing agent to the upper surface of the separation plate 8 using a dispenser, a silk screen or the like, and separating the lower surface of the flow path forming member 2 via the sealing agent 11. This is done by contacting the upper surface of the plate 8. As this sealant 11, for example, TSE399 (trade name) manufactured by GE Toshiba Silicone Co., Ltd. is used. Thereby, even if there is a difference in processing accuracy between the contact surfaces of the separation plate 8 and the flow path forming member 2, the sealant 11 is interposed between the two members, so that the upper common liquid chamber is separated. Is possible.

  Furthermore, in this embodiment, as shown in FIGS. 3 and 5, since the groove 9 is formed on the contact surface on the separation plate 8 side, the separation plate 8 and the flow path forming member 2 are more reliably sealed. It can be separated by the stopper 11. That is, by bringing the separating plate 8 and the flow path forming member 2 into contact with each other, the sealing agent 11 interposed therebetween penetrates into the groove 9 while being spread sideways, so that the sealing agent 9 Is held between the flow path forming member 2 and the separation plate 8. For this reason, while being able to isolate | separate both members reliably with a sealing agent, the quantity which the sealing agent 11 leaks outside between the flow-path formation member 2 and the separation plate 8 can also be reduced. . In addition, the groove | channel which hold | maintains the sealing agent 11 may be formed in the contact surface (lower surface) by the side of the flow-path formation member 2, as shown in FIG. 6, The same effect can be acquired also in this case. . Moreover, even if the sealing agent 11 is applied to the contact surface (lower surface) on the flow path forming member 2 side, the upper common liquid chambers can be similarly separated.

Next, a separation structure between the lower layer supply liquid chambers 6f will be described mainly based on FIG. 5 or FIG.
The nozzle wall forming portion 6 for forming the lower layer supply liquid chamber 6f is formed on the heater board 5 using photolithography. That is, after the ultraviolet photosensitive resin film is laminated on the heater board 5, only the portion where the nozzle wall forming portion 6 is to be formed is irradiated through a photomask, and the other unexposed portions are melted with a developer. It is formed by removing. In this embodiment, the nozzle wall formation part 6 shown in FIG. 2, FIG. 4 is formed by laminating | stacking three ultraviolet photosensitive resin films f1, f2, and f3 which consist of the same raw material one by one by photolithography. As a result, the periphery of the ejection port of the present embodiment is formed of the same material, and uniform wettability can be obtained around the ejection port, and the ejection direction of the ink droplets can be stabilized. .

Further, by forming the nozzle wall forming portion 6 using photolithography as described above, fine nozzles can be formed with high density and high accuracy, and high flatness can be obtained on the lower and upper surfaces thereof. Can do. Therefore, a high degree of adhesion can be obtained between the lower surface of the heater board 5 and the lower surface of the separation plate 8 made of a silicon substrate having a high flatness and the upper surface and the lower surface of the nozzle wall forming portion 6 in contact therewith. . Accordingly, it is possible to reliably prevent ink from leaking from between the nozzle wall forming portion 6 and the heater board 5.
Further, in this embodiment, a groove 6e for introducing a sealing agent is provided on the upper surface of the divided region 6d of the nozzle wall forming portion 6, and the sealing agent 12 is filled therein as shown in FIG. For this reason, it is possible to reliably prevent ink from leaking from between the separation plate 8 and the nozzle wall forming portion 6.
Further, since the nozzle wall forming portion 6 and the separation plate 8 can be brought into contact with each other with a high degree of adhesion, when the sealing agent 12 is filled, the sealing agent 12 is separated from the nozzle wall forming portion 6 and the separation plate 8. It leaks out from the space and does not flow into the flow path. For this reason, ejection failure occurs in the nozzle due to the sealing agent 12 flowing into the flow path, or the sealing agent flows out to the ejection port forming surface F and adheres to the ejection port forming surface F, and the ejection port forming surface F The nozzles having excellent discharge performance can be formed without causing non-uniform wettability.

  In this embodiment, the silicon sealant TSE399 (trade name) manufactured by GE Toshiba Silicone was used as the sealant, but it has a relatively high viscosity and adversely affects the ejection of ink droplets due to contact with ink. Other sealants can be used as long as they do not generate precipitates that affect the above.

Next, the structure of the ejection port forming surface F1, which is one of the characteristic configurations of the ink jet recording head according to the first embodiment of the present invention, will be described with reference to FIG.
As described above, in the first embodiment, the discharge element 4 having a plurality of nozzles is formed by the heater board 5, the nozzle wall forming portion 6, and the separation plate 8. The end face of the discharge element 4 is a discharge port forming surface F1 that forms the discharge port 6a of each nozzle. On the ejection port formation surface F, ejection port groups N1 to N4 (see FIGS. 2 and 7 (only N1 and N2 are shown in FIG. 7)) of a plurality of nozzles that eject different types of ink are formed. . Between each nozzle group, a plurality of regions (discharge port group separation regions) E1 where the discharge ports 6a do not exist are formed by the end surfaces of the divided regions 8b of the separation wall 8 and the end surfaces of the divided portions 6d of the nozzle wall forming part 6. Has been. A slit-shaped recess (ink blocking portion) R1 is formed in the ejection port group separation region E1. The number of slits is not particularly limited, but a plurality (three) of slits are formed in this embodiment. The slit formation direction (longitudinal direction) is a direction (here, a direction orthogonal) intersecting the nozzle arrangement direction, and the end surface of the heater board 5 from the upper end surface of the separation wall 8 through the nozzle wall forming portion 6. It is formed in the range to reach. The recess R1 has a rectangular cross-sectional shape. The recess R1 is formed in advance by forming slit-like grooves in each of the heater board 5, the nozzle wall forming portion 6 and the separation plate 8, and positioning and polymerizing each member. Anyway. It is also possible to form each member 5, 6, 8 after polymerization.

  By forming the concave portion R1 as described above, even when a recovery operation such as a suction recovery operation, a pressure recovery operation, or a wiping recovery operation is performed on the recording head, the ink discharged from each nozzle group is discharged. Intrusion into adjacent nozzle groups can be greatly suppressed. In other words, when recovery of suction such as suction recovery, preliminary discharge, or pressure recovery is performed, a relatively large amount of ink is discharged and attached to the side of the discharge port forming surface, so that the ink travels along the discharge port forming surface. May flow toward adjacent nozzle groups. Also, when wiping recovery is performed, the wiped ink may flow toward the adjacent nozzle group. However, in the first embodiment, the ink that has flowed flows into the concave portion R1 and is blocked there, so that intrusion to the adjacent nozzle group side is suppressed. For this reason, in the first embodiment, it is possible to reduce color mixing due to ink intruding into adjacent nozzle groups, and high-quality image formation is possible. In addition, as a result of reducing the occurrence of color mixing as described above, it is also possible to reduce the amount of ink discharged in preliminary ejection performed as one of the purposes of eliminating color mixing, thereby reducing the running cost. Reduced.

(Second Embodiment)
Next, a second embodiment of the present invention will be described with reference to FIG. In FIG. 8, the same reference numerals are given to the same or corresponding parts as those in the above embodiment.
In the second embodiment, a concave portion having a concave arc surface cross-sectional shape is formed in each nozzle separation region E1 formed between the nozzle groups N1 to N4 in the ejection port forming surface F1 of the recording head. The ink blocking portion (R2) is formed in a direction intersecting with the arrangement direction of the ejection ports 6a (a direction orthogonal to the drawing). Also in this concave portion R2, grooves formed in the heater board 5, the nozzle wall forming portion 6 and the separation plate 8 in advance may be combined, or after the members 5, 6, 8 are superposed. It is also possible to form. Although FIG. 8 illustrates the case where a single recess R2 is formed in the nozzle group separation area FA, a plurality of recesses R2 can be formed.

  Also in this embodiment, when the ink adhering to the ejection port forming surface F1A moves toward the adjacent nozzle group in the recovery operation, the ink is received by the concave portion R2 to be dammed and flowed downward. Color mixing due to ink entering the nozzle group can be reduced. In the second embodiment, the exhaust hole 15 is formed in the formation portion of the recess R2 on the end surface of the nozzle wall formation portion that forms a part of the discharge port formation surface 8. The exhaust hole 15 communicates with the sealant introduction groove 6e shown in FIG. For this reason, when introduce | transducing sealing agent in this sealing agent introduction groove | channel 6e, internal air can be discharged | emitted from the exhaust hole 15, and sealing agent can be introduce | transduced smoothly.

(Third embodiment)
Next, a third embodiment of the present invention will be described with reference to FIGS.
In the ink jet recording head shown in the third embodiment, the discharge port forming surface F2 of the recording head shown in the first embodiment is formed in an arc shape in cross section. In the ink jet recording heads according to the first and second embodiments described above, since the discharge port forming surface F is formed in a flat shape, the discharge port forming surface F1 and the ceramic plate 1, and the discharge port forming surface F2 and the flow are formed. A step S (see FIG. 7 and FIG. 8) occurs between the path forming member 2 and the road forming member 2. This is because the discharge port forming surface is discharged slightly outward from the upper and lower members 1 and 2 so that the blade can easily wipe the discharge port forming surface in the wiping operation. However, when the wiping operation is performed, the ink wiped off by the blade accumulates in the step S, and the ink may enter the nozzle along the face surface F2 to cause color mixing.

  Therefore, in the third embodiment, as shown in FIGS. 9 and 10, the cross-sectional shape of the discharge port forming surface F1 is formed in an arc shape. According to this, the discharge port forming surface F2 is discharged outward without forming a step between the ceramic plate 1 and the flow path forming member 2 and the discharge port forming surface F2. be able to. For this reason, the ink wiped off from the ejection port formation surface F2 during the wiping operation is not accumulated, and color mixing can be reduced.

(Other)
In the first to fourth embodiments, it is possible to apply water repellent processing to the recesses formed on the discharge port forming surface. According to this, when the ink in the nozzle is discharged by suction or pressurization, the ink is less likely to be transmitted through the discharge port formation surfaces F1 and F2 due to the water-repellent recessed portion. Is further improved.

  In each of the above embodiments, the ink blocking portion formed on the discharge port forming surface is formed by the concave portion, but the ink blocking portion may be configured by a convex portion formed on the discharge port forming surface. However, in this case, it is desirable to make the blade somewhat flexible in order to ensure contact between the blade and the discharge port forming surface in the wiping operation.

(Embodiment of inkjet recording apparatus)
Next, an embodiment of a recording apparatus using the ink jet recording head described in the above embodiment will be described with reference to FIGS.
FIG. 11 is a perspective view schematically showing an external configuration of the recording apparatus 20 in the present embodiment. The recording apparatus 20 shown here transports the recording medium P in a certain direction (Y direction) and performs recording while reciprocating the recording head H along the direction (X direction) intersecting the transport direction of the recording medium P. A so-called serial scan type recording apparatus is configured. In the figure, reference numeral 21 denotes a carriage on which the recording head H shown in the above embodiment and an ink tank 22 for storing ink to be supplied are mounted. The carriage 21 is in a direction orthogonal to the conveyance direction Y of the recording medium P ( Reciprocate along the X direction). Various transport mechanisms for transporting the recording medium can be applied. Here, a transport roller that rotates by a driving force such as a motor and a pinch roller (both illustrated) provided opposite to the transport roller. (Omitted).

  FIG. 12 is a block diagram illustrating a schematic configuration of a control device 200 that controls driving of the recording apparatus. The control device 200 includes an image controller 201 that processes print data sent from the host computer 300, an engine controller 202 that controls conveyance of the recording medium and movement of the carriage 21, and a recording head controller 203 that controls ejection of ink droplets. Etc.

  The engine controller 202 includes a data rasterization unit 205, an ejection pulse generator 206, a transport control unit 207, a motor control unit 208, and the like. Among these, the data rasterization unit 205 performs rasterization processing for assigning serial print data sent from the image controller 101 to each nozzle. Further, the ejection pulse generator 206 sends ejection pulses representing the drive timing of the print head to the print head controller 203. The recording head controller 203 drives each nozzle (heater) of the recording head based on the pulse from the ejection pulse generator 205 and the image data sent from the data rasterizing unit 205.

  The conveyance control unit 207 controls the driving of the conveyance motor, and controls the rotation of the conveyance roller that is rotated by the driving force of the conveyance motor. The carriage motor control unit 107 detects the movement position of the carriage 22 based on a signal from the carriage scale encoder 204 and controls the carriage motor 210 to control the carriage drive, stop and acceleration, constant speed movement, deceleration, and the like. Do.

  In the recording apparatus configured as described above, the recording medium P is intermittently transported in the Y direction while being sandwiched between a transport roller that is rotated by the transport motor 105 and a pinch roller provided opposite to the transport roller. The The carriage 21 on which the recording head H is mounted moves during the stop period of the recording medium P, and performs recording within the nozzle arrangement range by discharging ink from the recording head H during the movement. By repeating this recording operation and the intermittent conveyance operation of the recording medium P, a predetermined image is formed on the recording medium P.

  As described above, in the ink jet recording head according to the present invention, as described in the claims, since the separation portion of the common liquid chamber is divided into the upper layer and the lower layer, reliable separation between the common liquid chambers can be performed. In addition, since the concave portion is provided at a position corresponding to the common liquid chamber separation portion of the face surface, it is possible to suppress the penetration of different inks into the nozzles along the face surface.

1 is a perspective view showing an ink jet recording head in an embodiment of the present invention. FIG. 2 is an exploded perspective view showing an internal structure of the recording head in the first embodiment of the present invention. FIG. 3 is a top view of a separation plate provided in the recording head according to the first embodiment of the present invention. FIG. 4 is a longitudinal front view of the recording head according to the first embodiment of the present invention cut along a cutting line A-A ′ shown in FIG. 3. FIG. 4 is a longitudinal front view of the recording head according to the first embodiment of the present invention cut along a cutting line B-B ′ shown in FIG. 3. FIG. 6 is a longitudinal side view illustrating a modification of the recording head illustrated in FIG. 5. FIG. 2 is a perspective view illustrating a structure of a discharge port forming surface of the ink jet recording head according to the first embodiment of the present invention. FIG. 2 is a perspective view illustrating a structure of a discharge port forming surface of the ink jet recording head according to the first embodiment of the present invention. FIG. 2 is a perspective view illustrating a structure of a discharge port forming surface of the ink jet recording head according to the first embodiment of the present invention. FIG. 2 is a perspective view illustrating a structure of a discharge port forming surface of the ink jet recording head according to the first embodiment of the present invention. 1 is a perspective view schematically showing an external configuration of a recording apparatus according to an embodiment of the present invention. It is a block diagram which shows schematic structure of the control apparatus which controls the drive of the recording device shown in FIG. FIG. 10 is a longitudinal front view showing a configuration of a common liquid chamber in a conventional recording head.

Explanation of symbols

1 Ceramic plate,
2 Flow path forming member (third member)
2a Upper common liquid chamber 3a Ink supply port 4 Discharge element 5 Heater board (substrate)
6 Nozzle wall forming part (first member)
6a Discharge port 6b Liquid path 6c Dividing part 6e First sealant filling groove 6f Upper common liquid chamber 61, 62, 63 Nozzle wall 7 Electric wiring board 8 Separating plate (second member)
8a Opening 8b Divided area 8c, 8d Second sealing agent filling groove 11 Sealing agent 12 Sealing agent 14 Wire 15 Exhaust hole 16 Gap 17 Flow path 20 Recording device 21 Carriage 22 Ink tank 200 Control device H Recording head P Recording medium F1, F2 discharge port forming surface R1, R2 concave portion N1, N2 discharge port group S step

Claims (11)

In an inkjet recording head in which a plurality of ejection port groups formed by arranging a plurality of ejection ports for ejecting ink are arranged on a single ejection port forming surface, and different inks are ejected from each of the ejection port groups,
An ejection block group separation region that separates the ejection port groups is formed on the ejection port formation surface, and an ink blocking unit that blocks an ink flow between the ejection port groups in the ejection port group separation region. An ink jet recording head formed. A plurality of discharge port groups formed by arranging a plurality of discharge ports for discharging ink are arranged on a single discharge port forming surface, and a plurality of common liquid chambers communicating with each of the discharge port groups are formed on the same substrate, In an ink jet recording head configured to discharge different inks supplied to the plurality of common liquid chambers from discharge port groups corresponding to the common liquid chambers,
A discharge port group separation region for separating the respective discharge port groups is formed at a position corresponding to the division position of each common liquid chamber in the discharge port forming surface, and each discharge port is separated in the discharge port group separation region. An ink jet recording head characterized in that an ink blocking portion for blocking an ink flow between the outlet groups is formed. A first member fixed on the substrate;
A second member that contacts the upper surface of the first member via a sealant;
A third member that contacts the upper surface of the second member via a sealant,
Forming a lower liquid chamber communicating with the discharge port by the first member, and forming a plurality of upper liquid chambers corresponding to the plurality of lower liquid chambers by the third member;
By connecting each of the lower liquid chambers and the corresponding upper liquid chambers with only the plurality of openings formed in the second member, a plurality of common liquid chambers in which the flow of ink is blocked from each other are provided. The ink jet recording head according to claim 2, wherein the ink jet recording head is formed.   The ejection port forming surface is formed by end surfaces of the first member, the second member, and the third member, and the ink blocking portion is formed from the first upper surface to the lower surface of the third member. The ink jet recording head according to claim 3, wherein the ink jet recording head is provided.   5. The ink jet recording head according to claim 1, wherein the ink blocking portion is at least one slit-like recess formed in the nozzle group separation region.   5. The ink jet recording head according to claim 1, wherein the ink blocking portion is a concave portion having at least one arc-shaped cross section formed in the discharge port group division region.   The ink jet recording head according to claim 1, wherein at least the ink blocking portion of the discharge port group divided region is subjected to water repellent processing.   The ink jet recording head according to claim 1, wherein the discharge port forming surface has an arc shape in cross section. Forming at least one of the upper surface of the first member and the lower surface of the second member in contact with the first member to fill the sealant with the sealant;
9. The method according to claim 2, wherein a hole communicating with the first sealing agent filling groove is formed in the ink blocking portion of the discharge port forming surface formed by the first member. 2. An ink jet recording head according to 1.   The ink jet recording head according to claim 1, wherein the ink blocking portion is formed by a convex portion formed on the discharge port forming surface. An inkjet recording apparatus that performs a recording operation using the inkjet recording head according to claim 1.

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