JP6066638B2 - Liquid discharge head - Google Patents

Description

  The present invention relates to a liquid discharge head provided in an ink jet recording apparatus that performs a recording operation by discharging ink.

  Japanese Patent Application Laid-Open No. 2004-228688 discloses a liquid discharge head including a plurality of nozzle rows that discharge ink to form an image on a recording medium. The liquid discharge head includes a heater (energy generating element) that generates thermal energy, a plurality of discharge ports that discharge ink, a flow path forming member that includes an ink flow path, and an ink supply port that supplies ink to the ink flow path. It has the board | substrate provided with. The ink is heated by a heater that generates thermal energy, and is ejected from the ejection port using the pressure of bubbles generated when the film boils.

  The plurality of nozzle supply ports are configured by eight rows in which gray (Gray) and photo black (Photo Black) having different densities are added to the three primary colors of cyan (Cyan), magenta (Magenta), and yellow (Yellow). As described above, by adding colors such as gray and black to the three primary colors of cyan, magenta, and yellow, high-quality recording can be performed on the recording medium. The color arrangement of the ink supply ports is in the order of black, gray, cyan, magenta, yellow, magenta, cyan, and gray. Multiple discharge ports that discharge yellow and black ink have only large discharge ports for discharging large ink droplets, and cyan, magenta, and gray are used for discharging small ink droplets in addition to large discharge ports. It has a small discharge port. Since yellow has high brightness and the granularity on the image is not noticeable, small ink droplets are unnecessary, and small black ink droplets can be substituted with gray, so that a small discharge port is unnecessary.

  Patent Document 2 discloses a liquid discharge head including a nozzle row formed of a plurality of discharge ports for discharging ink to form an image on a recording medium, which is formed by using a photolithography technique. ing. This nozzle array is formed by exposing and developing a flow path forming member (photoresist) bonded to the surface of the substrate. An ink supply port is provided in the substrate, and a plurality of discharge ports (ink discharge ports) are formed in the flow channel forming member, and an ink flow channel for flowing ink from the ink supply port to the discharge port is formed. A plurality of beams (partition walls) are provided at the ink supply port, and only one nozzle row is formed on the substrate, so that the substrate has high rigidity.

JP 2010-76394 A JP-A-10-138478

  However, in the invention disclosed in Patent Document 1, the thermal energy generated by the heater when ink is ejected causes the substrate 110 to thermally contract as shown in FIG. 1, so that both ends of the substrate 110 are centered. There was a problem of distortion. When the substrate 110 is distorted, the pressure applied to the substrate 110 is distributed, the stress is concentrated at both ends, and the ink supply ports 60 at both ends of the substrate 110 are distorted. If the ink supply ports 60 at both ends of the substrate 110 are distorted toward the center of the substrate, the flow path forming member joined to the substrate 110 that forms the ink supply ports 60 and the discharge ports is greatly deformed. When the flow path forming member is distorted, the ejection port is also deformed, and the landing accuracy of the ink droplets ejected from the ejection port on the recording medium is deteriorated. Alternatively, even if the substrate 110 is distorted, the highly rigid flow path forming member is not distorted. For this reason, stress is generated between the substrate 110 and the flow path forming member, and the substrate 110 and the flow path forming member may be peeled off. there were. On the other hand, there is a measure to increase the area outside the ink supply ports at both ends of the substrate to make it difficult to distort, but the entire substrate becomes larger, which increases the cost and size of the liquid discharge head. It will be connected.

  In the invention disclosed in Patent Document 2, since only one nozzle row is arranged with respect to the substrate, it is necessary to provide a plurality of substrates in the liquid ejection head in order to perform high-quality recording. There was a problem that would lead to an increase in cost and size. Further, since the beam is provided at the ink supply port, the area of the ink supply port is reduced in plan view as compared with the case where no beam is provided, so that the ink supply port is supplied to the ink flow path. There was a problem that the amount of ink to be reduced.

  Accordingly, an object of the present invention is to provide a liquid discharge head that solves the above-described problems and suppresses the deterioration of ink landing accuracy by suppressing thermal contraction of the substrate due to thermal energy.

In order to achieve the above object, the present invention provides a substrate, a flow path forming member laminated on the substrate, a plurality of discharge ports for discharging a liquid formed on the flow path forming member, and a flow path formation. A plurality of liquid flow paths that are formed in the member and communicate with the respective discharge ports; a plurality of energy generation devices that are disposed on the substrate and generate thermal energy that is positioned in each liquid flow path; A plurality of liquid discharge ports that each supply a liquid to a part of the plurality of liquid flow paths, and each of the substrates includes at least a substrate. A plurality of beams are formed inside the liquid supply ports provided at both ends and along the direction of the short part of the supply port, and the flow path forming member has reinforcements positioned directly above the plurality of liquid supply ports, respectively. A rib is provided. Another feature of the present invention is that the substrate, the flow path forming member laminated on the substrate, the plurality of discharge ports for discharging the liquid formed on the flow path forming member, and the flow path forming member A plurality of liquid flow paths that are formed and communicate with the respective discharge ports, a plurality of energy generators that are disposed on the substrate and generate thermal energy respectively located in each liquid flow path, and a longitudinal portion. A plurality of liquid discharge ports that each have a short portion and are formed on the substrate and supply liquid to a part of the plurality of liquid flow paths, and the substrate includes at least both ends of the substrate. A plurality of beams are formed along the short-side direction of the supply port located inside the provided liquid supply port, and the number of beams positioned inside the individual liquid supply ports provided at both ends of the substrate is , Compared to the number of beams located inside the individual liquid supply ports other than both ends In the filtrate.

  According to the present invention, a plurality of ink supply ports are formed on the substrate, and beams are provided at least at the ink supply ports located at both ends of the substrate, whereby the strength of the substrate end is improved and the deformation of the substrate due to thermal contraction is suppressed. be able to.

It is a top view which shows the state which the board | substrate of a prior art deform | transforms. It is a perspective view which shows the inkjet recording device of this invention. It is a perspective view which shows the liquid discharge head of this invention. (A) And (b) is a top view which shows the surface of the board | substrate and flow-path formation member which the liquid discharge head which is the 1st Embodiment of this invention has. 4A is a sectional view taken along the line A1-A1 ′ of FIG. 4A, FIG. 5B is a sectional view taken along the line W1-W1 ′ of FIG. 5A, and FIG. 5C is a sectional view taken along line X1-X1 of FIG. 'Cross section. 4A is a B1-B1 ′ sectional view of the substrate shown in FIG. 4A, FIG. 4B is a sectional view taken along the line Y1-Y1 ′ in FIG. 6A, and FIG. 6C is Z1-Z1 in FIG. 'Cross section. (A) And (b) is a top view which shows the surface of the board | substrate and flow-path formation member which the liquid discharge head which is the 2nd Embodiment of this invention has. 7A is a cross-sectional view taken along the line A2-A2 ′ of the substrate shown in FIG. 7A, FIG. 7B is a cross-sectional view taken along the line W2-W2 ′ of FIG. 8A, and FIG. 'Cross section. 7A is a sectional view taken along the line B2-B2 ′ of the substrate shown in FIG. 7A, FIG. 7B is a sectional view taken along the line Y2-Y2 ′ in FIG. 9A, and FIG. 9C is a sectional view taken along line Z2-Z2 in FIG. 'Cross section. (A) And (b) is a top view which shows the surface of the board | substrate and flow-path formation member which the liquid discharge head which is the 3rd Embodiment of this invention has. (A) is an enlarged view of the A3 portion of the substrate shown in FIG. 10 (a), (b) is a cross-sectional view taken along W3-W3 ′ in FIG. 11 (a), and (c) is X3-X3 ′ in FIG. 11 (b). It is sectional drawing. 10A is a cross-sectional view taken along B3-B3 ′ of the substrate shown in FIG. 10A, FIG. 10B is a cross-sectional view taken along Y3-Y3 ′ in FIG. 12A, and FIG. 10C is Z3-Z3 in FIG. 'Cross section. (A) And (b) is a top view which shows the surface of the board | substrate and flow-path formation member which the liquid discharge head which is the 4th Embodiment of this invention has. FIG. 13A is a cross-sectional view taken along the line A4-A4 ′ of FIG. 13A, FIG. 14B is a cross-sectional view taken along the line W4-W4 ′ of FIG. 14A, and FIG. 'Cross section. (A) is a B4-B4 ′ cross-sectional view of the substrate shown in FIG. 13 (a), (b) is a Y4-Y4 ′ cross-sectional view of FIG. 15 (a), and (c) is Z4-Z4 of FIG. 15 (b). 'Cross section. (A) And (b) is a top view which shows the surface of the board | substrate and flow-path formation member which the liquid discharge head which is the 5th Embodiment of this invention has. (A) and (b) are A5-A5 'cross-sectional views and plan views of the substrate shown in FIG. 16 (a), and (c) and (d) are B5-B5' cross-sectional views of the substrate shown in FIG. 16 (a). (E) and (f) are C5-C5 ′ cross-sectional views and plan views of the substrate shown in FIG. 16 (a). (A) And (b) is a top view which shows the surface of the board | substrate and flow-path formation member which the liquid discharge head which is the 6th Embodiment of this invention has. (A) is an enlarged view of the A6 portion of the substrate shown in FIG. 18 (a), (b) is a cross-sectional view taken along the line W6-W6 ′ of FIG. 19 (a), and (c) is X6-X6 ′ of FIG. 19 (a). It is sectional drawing.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(First embodiment)
FIG. 2 is a perspective view of the ink jet recording apparatus having the liquid discharge head according to the first embodiment of the present invention.

  The ink jet recording apparatus 5000 includes a liquid discharge head 5012, an ink tank 5014, an integrated ink jet cartridge 5024, and a carriage 5025. The liquid ejection head 5012 forms an image by ejecting ink onto the recording medium 5001 and is provided at a position facing the recording surface of the recording medium 5001. The ink tank 5014 stores ink ejected by the liquid ejection head 5012, is provided adjacent to the liquid ejection head 5012, and is built in the integrated inkjet cartridge 5024 together with the liquid ejection head 5012. The carriage 5025 incorporates an integrated inkjet cartridge 5024 and is provided on the guide rail 5003 so as to move in the directions of arrows a and b so as to reciprocate on the recording surface of the recording medium 5001.

  FIG. 3 is a perspective view showing the configuration of the liquid discharge head 5012.

  The liquid discharge head 5012 is configured to discharge ink by causing a change in the state of ink by thermal energy in order to achieve high density and high definition of characters and images recorded on the recording medium 5001. Has been. The thermal energy is generated by the electrothermal conversion element, and the ink is ejected using the pressure caused by the bubbles generated when the ink is boiled by the generated thermal energy. The liquid discharge head 5012 includes a substrate 110, a plurality of heaters 40 that are electrothermal conversion elements provided on the substrate 110, a flow path forming member 111 stacked on the surface of the substrate 110, and a flow path forming member 111. It has a plurality of discharge ports 10 provided.

  The substrate 110 is formed of glass, ceramics, resin, metal, or the like, and is generally formed of Si (silicon). In addition, the substrate 110 has an elongated ink supply port 60 having a long portion and a short portion for supplying ink from the common liquid chamber 112 on the surface of the substrate 110. The plurality of heaters 40 are provided on the surface of the substrate 110 in two rows so as to sandwich the ink supply port 60 with respect to one ink supply port 60. The surface of the substrate 110 and the plurality of heaters 40 are covered with an insulating film (not shown) that improves heat dissipation. Further, on the surface of the substrate 110, a protective film (not shown) for protecting from cavitation generated when bubbles are eliminated is formed so as to cover the insulating film.

  The flow path forming member 111 has a plurality of ejection ports 10 formed on the surface thereof, and a plurality of ink flow paths 30 are provided on the joint surface with the substrate 110 on the opposite side of the surface. The plurality of ejection ports 10 eject ink to form an image on a recording medium, and one ink supply port 60 is directly above the plurality of heaters 40 provided on the substrate 110 in the stacking direction of the flow path forming members 111. Are arranged in two rows. The interval between the discharge ports 10 is set to 600 dpi or 1200 dpi. The plurality of ink flow paths 30 are formed on the joint surface between the substrate 110 and the flow path forming member 111 and communicate with ink supply ports 60 provided on the substrate 110 in order to supply ink to the respective discharge ports 10. ing. Further, the heater 40 provided on the substrate 110 and the ejection port 10 provided on the flow path forming member are provided for each ink flow path 30 one by one. The flow path forming member 111 is formed of a photosensitive resin or the like.

  4A and 4B are plan views showing the configurations of the surface of the substrate and the surface of the flow path forming member constituting the liquid ejection head in the first embodiment of the present invention.

  As shown in FIG. 4A, a plurality of ink supply ports 60 as liquid supply ports are arranged on the surface of the substrate 110, and a thermal energy generator is provided on both sides of each ink supply port 60 in a plan view. A plurality of heaters 40 are arranged. In the present embodiment, four independent ink supply ports 60 are formed. From one end of the substrate 110 toward the other end, an ink supply port Bk that supplies black ink, an ink supply port C that supplies cyan ink, an ink supply port M that supplies magenta ink, and yellow ink are supplied. The ink supply ports Y are arranged in the order. As shown in FIG. 4B, a plurality of discharge ports 10 are formed on the surface of the flow path forming member 111. In each ejection port 10, a plurality of ejection ports 10 arranged on both sides of the ink supply port 60 on the surface of the substrate 110 constitute a pair of nozzle rows 50. A plurality of nozzle rows 50 are formed.

  The discharge port 10 has a circular shape, and its diameter is φ16 μm. The amount of liquid discharged from the discharge port 10 is 4 to 6 pl. The heater 40 is a square of 24 μm × 24 μm. The width of the ink supply port 60 in the short-side direction is about 60 μm. The pitch of the heater 40 and the ejection port 10 is 600 dpi, 42.3 μm, and the arrangement positions on both sides of the ink supply port 60 are shifted by a half pitch, and a total of 1200 dpi is formed in two rows. The number of discharge ports 10 is 1024 nozzles per nozzle row, and the length of the nozzle row is 0.85 inches (2.159 cm).

  As shown in FIG. 5A, the flow path forming member 111 is provided with a nozzle filter 31 positioned between the ink flow path 30 that is a liquid flow path communicating with the heater 40 and the ink supply port 60. It has been. Further, the substrate 110 is provided with beams 61 positioned inside the ink supply ports 60 (Bk and Y in this embodiment) at both ends. On the other hand, as shown in FIGS. 6A to 6C, in the ink supply ports 60 (C and M in this embodiment) other than the ink supply ports 60 provided at both ends of the substrate 110 in the present embodiment. The beam 61 is not provided. The width of the beam 61 provided in the Bk and Y ink supply ports 60 at both ends is about 25 μm, and the pitch is 84.6 μm. As shown in FIGS. 5B and 5C, the thickness of the beam 61 is preferably thinner than the thickness of the substrate 110 so as not to reduce the amount of ink supplied. In this embodiment, 127 beams 61 are provided for each ink supply port 60, but the number of beams 61 may be about 30. Further, the beam 61 may be provided with the same material as the substrate 110 or may be provided with another added member. When the beam 61 is made of the same material as the substrate 110 and is provided integrally with the ink supply port 60, a plurality of beams 61 are formed by masking with a sacrificial layer from the back surface of the substrate 110 and then digging by dry etching or the like. Is done. Further, in order to reduce the thickness of the beam 61, it is formed by performing a certain amount of digging from the back surface of the substrate 110 by wet etching or the like, then masking with a sacrificial layer or the like, and digging by dry etching or the like. The

  A method for discharging ink toward the recording medium by the liquid discharge head having the above-described configuration will be described.

  When image data is sent from a host computer (not shown) to the ink jet recording apparatus 5000, ink of a color necessary for image formation is supplied from the ink tank 5014 to the common liquid chamber 112. The ink supplied to the common liquid chamber 112 flows from the ink supply port 60 designated for each color into the ink flow path 30, passes through the nozzle filter 31, and the heater 40 and the flow path on the inner surface of the ink flow path 30. The pressure is supplied to the pressure chamber 41 surrounded by the forming member 111. When ink is supplied to the pressure chamber 41, electric energy is applied to the heater 40. When the heater 40 generates thermal energy, the ink in the pressure chamber 41 boils and bubbles are generated. The generated bubbles push up the ink in the pressure chamber 41 to the ejection port 10, and the ink is ejected from the ejection port 10 at a moment when the ink is pushed up to the ejection port 10.

  As described above, the liquid ejection head 5012 ejects ink using thermal energy. However, if the heater 40 continues to generate thermal energy, as shown in FIG. The ink supply port 60 is deformed along the short side direction. At this time, the ink supply ports 60 provided in the region near the center other than both ends are hardly deformed, but the ink supply ports 60 at both ends of the substrate 110 are greatly deformed. On the other hand, in this embodiment, the plurality of beams 61 are provided in the ink supply ports 60 at both ends of the substrate 110, thereby preventing deformation of both ends of the substrate 110 due to thermal contraction. Thereby, since the substrate 110 is not distorted, the discharge port 10 is deformed when the flow path forming member 111 is distorted together with the substrate 110, or stress is generated between the substrate 110 and the flow path forming member 111 and peeled off. There is no fear. Accordingly, the liquid discharge head 5012 can accurately discharge ink.

  On the other hand, since the region near the center of the substrate 110 is hardly deformed by pressure, the ink supply port 60 is not deformed even if the beam 61 is not provided. Therefore, the ink supply ports 60 other than the ink supply ports 60 at both ends of the substrate 110 are not provided with the beam 61, and the opening area of the ink supply port 60 is large so that a large amount of ink flows from the ink supply port 60 to the ink flow path 30. Widely set. As a result, the amount of ink required for high-quality image formation can be discharged from the discharge port 10.

(Second Embodiment)
FIGS. 7A and 7B are plan views showing the configurations of the surface of the substrate and the surface of the flow path forming member constituting the liquid ejection head in the second embodiment of the present invention.

  In the second embodiment of the present invention, as shown in FIGS. 8A and 9A, all the ink supply ports 60 formed in the substrate 110 are viewed in the stacking direction of the flow path forming members 111. A reinforcing rib 32 is provided immediately above. The reinforcing rib 32 is provided on the flow path forming member 111 so as to be joined to the substrate 110 around the ink supply port 60. The reinforcing rib 32 has a main trunk portion 32a parallel to the longitudinal direction of the ink supply port 60, and a plurality of branch portions 32b extending in a direction perpendicular to the main trunk portion 32a. When the reinforcing rib 32 is not provided, the flow path forming member 111 may swell and deform due to the ink being absorbed by the flow path forming member 111 itself depending on the type of ink. On the other hand, since the reinforcing rib 32 is provided in the present invention, the rigidity of the flow path forming member 111 is increased, and the flow path forming member 111 itself can be prevented from swelling even when ink is absorbed. The reinforcing rib 32 may be provided with the same material as the flow path forming member 111 or may be provided with another added member. Other configurations and dimensions, a method of ejecting ink from the liquid ejection head, and the like are the same as those in the first embodiment, and are omitted.

  By providing the reinforcing rib 32 in the vicinity of the ink supply port 60 in this way, the flow path forming member 111 itself is not deformed by swelling, and the liquid discharge head 5012 can accurately discharge ink. . Furthermore, there is no possibility that the joint between the substrate 110 and the flow path forming member 111 will be peeled off.

(Third embodiment)
FIGS. 10A and 10B are plan views showing the configuration of the surface of the substrate and the surface of the flow path forming member constituting the liquid ejection head in the third embodiment of the present invention.

  In the third embodiment of the present invention, the width D1 in the short direction of the ink supply ports 60 at both ends of the substrate 110 shown in FIG. 11A is close to the center of the substrate 110 shown in FIG. The ink supply port 60 in the region is configured to be wider than the width D2 in the short-side direction. The reinforcing rib 32 includes a plurality of branch portions 32b and one main trunk portion 32a arranged so as to be bonded to the substrate 110 around the ink supply port 60 across the ink supply port 60. The width D1 in the short direction of the ink supply ports 60 (Bk and Y) at both ends of the substrate 110 is 100 μm, and the width D2 in the short direction of the ink supply ports 60 (C and M) in the region near the center of the substrate 110. Is set to be 60 μm or more. Other configurations and dimensions, a method for ejecting ink from the liquid ejection head, and the like are the same as those in the second embodiment, and are omitted.

  If the beam 61 is provided in the ink supply port 60 and the reinforcing rib 32 is provided immediately above the ink supply port 60, the opening area of the ink supply port 60 is reduced, and therefore the amount of ink flowing from the common liquid chamber 112 into the ink flow path 30. There is a possibility that (average liquid supply amount) may be reduced. Therefore, in this embodiment, the ink supply port 60 is widened to increase the opening area of the ink supply port 60 so that the amount of ink flowing from the common liquid chamber 112 into the ink flow path 30 does not decrease. . Further, the opening of the ink supply port 60 can be set wide by using a configuration in which the reinforcing rib 32 has only one main trunk portion 32a so that the area for closing the opening of the ink supply port 60 is small. Thereby, it is possible to prevent the amount of ink flowing from the common liquid chamber 112 into the ink flow path 30 from decreasing.

  Thus, by reducing the area in which the reinforcing rib 32 provided close to the ink supply port 60 covers the ink supply port 60, the liquid discharge head 5012 can accurately discharge ink without reducing the amount of ink to be supplied. it can. Furthermore, by providing the reinforcing rib 32 in the vicinity of the ink supply port 60, the flow path forming member 111 itself is not deformed due to swelling, and the joint portion between the substrate 110 and the flow path forming member 111. There is no risk of peeling off.

(Fourth embodiment)
FIGS. 13A and 13B are plan views showing the configuration of the surface of the substrate and the surface of the flow path forming member constituting the liquid ejection head in the fourth embodiment of the present invention.

  In the fourth embodiment of the present invention, as shown in FIG. 13A, a plurality of ink supply ports 60 are arranged on the surface of the substrate 110, and a plurality of heaters 40 are provided on both sides of each ink supply port 60. It is arranged. In this embodiment, eight ink supply ports 60 are formed. Ink supply port PhotoBk for supplying photo black ink, Ink supply port Gray for supplying gray ink, Ink supply port C for supplying cyan ink, Ink supply port M for supplying magenta ink, Ink supply port Y for supplying yellow ink It is. The arrangement order is PhotoBk, Gray1, C1, M1, Y, M2, C2, and Gray2 from the end of the substrate 110.

  PhotoBk, Gray1, and Gray2 other than cyan, magenta, and yellow are ink supply ports 60 used only for printing photographic images, and are not used for high-speed printing such as plain paper printing and copy printing. Therefore, PhotoBk and Gray1 and Gray2 are not at least a problem in the amount of ink supplied, and the opening area may be smaller than that of the other ink supply ports 60. Therefore, as in the configuration used in the first embodiment, even if the beam 61 is provided in the ink supply port 60 of PhotoBk, Gray1, and Gray2, the width in the short-side direction of the ink supply port 60 is the center of the substrate 110. May be the same as the width of the ink supply port 60 in the short-side direction in the region close to. Other configurations and dimensions, a method of ejecting ink from the liquid ejection head, and the like are the same as those in the second embodiment, and are omitted.

  By providing a large number of ink supply ports 60 in the substrate 110 in this way, it is possible to discharge multi-color inks necessary for high-quality printing from one liquid discharge head 5012. Therefore, a plurality of single-color liquid discharge heads are provided. Since it is not necessary to use it, cost increase can be suppressed. Furthermore, as shown in FIG. 14, the ink supply ports 60 at both ends of the substrate 110 are provided with a plurality of beams 61, thereby preventing deformation of both ends of the substrate 110 due to thermal contraction. In addition, as shown in FIG. 15, by providing the reinforcing rib 32 in the vicinity of the ink supply port 60, the flow path forming member 111 itself is not deformed due to swelling, and the liquid discharge head 5012 supplies ink. It can be discharged accurately.

(Fifth embodiment)
FIGS. 16A and 16B are plan views showing the configuration of the surface of the substrate and the surface of the flow path forming member constituting the liquid ejection head in the fifth embodiment of the present invention.

  In the fifth embodiment of the present invention, as shown in FIGS. 17A to 17C, the ink supply ports 60 (PhotoBk, Gray2) at both ends of the substrate 110 and the second row of ink from both ends toward the center. A plurality of beams 61 are provided at the supply port 60 (Gray1, C2). The number of the plurality of beams 61 provided in the ink supply ports 60 at both ends is larger than the number of the plurality of beams 61 provided in the ink supply ports 60 in the second row from both ends toward the center. The width of the beam 61 provided in each of the ink supply ports 60 of PhotoBk, Gray1, Gray1, and C2 is about 25 μm. 127 beams 61 provided at the ink supply ports 60 of PhotoBk and Gray2 are provided at a pitch of 84.6 μm, and 63 beams 61 provided at the ink supply ports 60 of Gray1 and C2 are provided at a pitch of 169.2 μm. Is provided. The other ink supply port 60 is not provided with a beam 61. Other configurations and dimensions, a method of ejecting ink from the liquid ejection head, and the like are the same as those in the first embodiment, and thus are omitted.

  In this way, by providing the beams 61 not only at the ink supply ports 60 at both ends but also at the ink supply ports 60 in the second row from both ends toward the center, the substrate is more than the case where there are beams only at the ink supply ports 60 at both ends. The rigidity of 110 is increased, and the deformation of the substrate 110 due to heat shrinkage is suppressed. Thereby, since the substrate 110 is not distorted, the discharge port 10 is deformed when the flow path forming member 111 is distorted together with the substrate 110, or stress is generated between the substrate 110 and the flow path forming member 111 and peeled off. There is no fear. Accordingly, the liquid discharge head 5012 can accurately discharge ink. On the other hand, since the region near the center of the substrate 110 is hardly deformed by pressure, the ink supply port 60 is not deformed even if the beam 61 is not provided. Therefore, the ink supply ports 60 other than the ink supply ports 60 at both ends of the substrate 110 are not provided with the beam 61, and the opening area of the ink supply port 60 is large so that a large amount of ink flows from the ink supply port 60 to the ink flow path 30. Widely set. As a result, the amount of ink required for high-quality image formation can be discharged from the discharge port 10.

(Sixth embodiment)
FIGS. 18A and 18B are plan views showing the configurations of the surface of the substrate and the surface of the flow path forming member constituting the liquid ejection head in the sixth embodiment of the present invention.

  In the sixth embodiment of the present invention, one ink supply port 60 (Bk) is provided for one substrate 110. As shown in FIGS. 19A to 19C, the ink supply port 60 is provided with a plurality of beams 61. Further, the reinforcing rib 32 is composed of a plurality of branch portions 32b and one main trunk portion 32a arranged so as to be bonded to the substrate 110 around the ink supply port 60 across the ink supply port 60. A plurality of discharge ports 10 are formed on the surface of the flow path forming member 111 to constitute a pair of nozzle rows 50. The number of discharge ports 10 is 1536 nozzles, and the length of the nozzle row is 1.28 inches. Other configurations and dimensions, a method of ejecting ink from the liquid ejection head, and the like are the same as those in the first embodiment, and thus are omitted.

  If the heater 40 continues to generate heat energy to eject ink, the long substrate 110 may be deformed. However, in this embodiment, the plurality of beams 61 are provided in the ink supply port 60 of the substrate 110, thereby preventing deformation of both end portions of the substrate 110 due to thermal energy. Furthermore, by providing the reinforcing rib 32 in the vicinity of the ink supply port 60, the flow path forming member 111 itself is not deformed due to swelling, and the joint portion between the substrate 110 and the flow path forming member 111. There is no risk of peeling off. Therefore, the liquid discharge head 5012 can accurately discharge ink.

DESCRIPTION OF SYMBOLS 10 Discharge port 30 Ink flow path 31 Nozzle filter 40 Heater 50 Nozzle row 60 Ink supply port 61 Beam 110 Substrate 111 Flow path forming member 112 Common liquid chamber 5012 Liquid discharge head

Claims (7)

A substrate, a flow path forming member laminated on the substrate, a plurality of discharge ports for discharging the liquid formed on the flow path forming member, and the flow path forming member. A plurality of liquid flow paths communicating with the respective outlets, a plurality of energy generating devices arranged on the substrate and generating thermal energy located on the inner surfaces of the liquid flow paths, and a long portion and a short portion. A plurality of liquid supply ports formed on the substrate, each supplying liquid to the plurality of liquid flow paths,
The substrate is formed with a plurality of beams that are located at least inside the liquid supply port provided at both ends of the substrate and extend along the short direction of the liquid supply port ,
The liquid discharge head according to claim 1, wherein the flow path forming member is provided with reinforcing ribs respectively positioned immediately above the plurality of liquid supply ports . A substrate, a flow path forming member laminated on the substrate, a plurality of discharge ports for discharging the liquid formed on the flow path forming member, and the flow path forming member. A plurality of liquid flow paths communicating with the respective outlets, a plurality of energy generating devices arranged on the substrate and generating thermal energy located on the inner surfaces of the liquid flow paths, and a long portion and a short portion. A plurality of liquid supply ports formed on the substrate, each supplying liquid to the plurality of liquid flow paths,
The substrate is formed with a plurality of beams that are located at least inside the liquid supply port provided at both ends of the substrate and extend along the short direction of the liquid supply port,
The number of the beams positioned inside each of the liquid supply ports provided at both ends of the substrate is larger than the number of the beams positioned inside each of the liquid supply ports other than both ends. liquid discharge head shall be the. The plurality of discharge ports form a plurality of pairs in a plan view, and one liquid supply port is formed between each pair of rows formed by the discharge ports. The liquid discharge head according to claim 1 or 2 . The plurality of liquid supply ports include liquid supply ports that supply different liquids, and an average liquid supply amount of the liquid supply ports provided at both ends of the substrate is an average liquid supply amount of the liquid supply ports other than both ends. liquid discharge head according to any one of claims 1 to 3, characterized in that less than the. The liquid supply port provided at both ends of the substrate, the liquid discharge head according to any one of claims 1 4, characterized by supplying a color other than cyan, magenta, and yellow. The short portion width of the liquid supply port provided at both ends of the substrate, from claim 1, wherein the thicker than the transverse section width of the liquid supply port other than both ends of the 5 The liquid discharge head according to claim 1. Wherein the plurality of outlets forms a nozzle array along the longitudinal portion direction of the liquid supply port, any one of the length of the nozzle array from claim 1, wherein the longer than 2.159Cm 6 The liquid discharge head described in 1.

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