JP6459415B2 - Line head and liquid ejecting apparatus - Google Patents

Description

  The present invention relates to a technique for ejecting a liquid such as ink.

  In a liquid ejecting technique in which a liquid is ejected from a plurality of nozzles onto a medium such as printing paper, there is a problem that liquid remaining on the ejection surface on which the plurality of nozzles are formed can adhere to the medium. In order to solve the above problems, for example, Patent Document 1 discloses a droplet discharge device in which movable piece portions are installed on the upstream side and the downstream side in the medium transport direction as viewed from the discharge head in which a plurality of nozzles are formed. It is disclosed. The movable piece protrudes toward the medium with respect to the ejection surface. With the above configuration, the medium that has approached the ejection surface due to floating or the like contacts the movable piece, and therefore it is possible to prevent contact of the medium with the ejection surface (and thus adhesion of liquid remaining on the ejection surface). It is.

JP 2009-160786 A

  However, in the technique of Patent Document 1, since the movable piece portions are installed on the upstream side and the downstream side of the ejection head, the medium is brought into contact with the ejection surface between the upstream movable piece portion and the downstream movable piece portion. There is a problem that it cannot be effectively suppressed. If the movable piece portion is formed sufficiently high with respect to the ejection surface, it is possible to suppress the contact of the medium with the ejection surface, but in order to ensure the height of the movable piece portion, the distance between the medium and the ejection surface. (So-called platen gap) needs to be enlarged. As the distance between the medium and the ejection surface is larger, there is a problem that an error in the position where the liquid from the nozzle lands on the surface of the medium becomes obvious. In view of the above circumstances, an object of the present invention is to effectively prevent contact of a medium with an ejection surface provided with a plurality of nozzles.

[Aspect 1]
In order to solve the above problems, a line head according to a preferred aspect (aspect 1) of the present invention is a line head that is long in the first direction, and is provided with a plurality of nozzles that inject liquid. And a protrusion that is installed along a second direction intersecting the first direction and protrudes from the injection surface. In aspect 1, the protrusion part which protrudes from the injection surface in which the some nozzle was installed is installed along the 2nd direction which cross | intersects (orthogonal or inclines) the X direction which is a longitudinal direction of a line head. Therefore, as compared with the configuration in which the protrusions are formed along the first direction, there is an advantage that the contact of the medium with the ejection surface can be prevented over a wide range in the direction intersecting the first direction.

[Aspect 2]
In a preferred example of aspect 1 (aspect 2), the plurality of nozzles are installed such that the pitch in the first direction is narrower than the pitch in the direction perpendicular to the first direction. In aspect 2, since the pitch in the first direction of the plurality of nozzles is narrower than the pitch in the direction perpendicular to the first direction, it is possible to increase the resolution (dot density) in the first direction on the medium.

[Aspect 3]
In a preferred example (Aspect 3) of Aspect 1 or Aspect 2, the second direction is a direction inclined with respect to the first direction. In aspect 3, for example, compared to the configuration in which the protrusions are formed along the direction orthogonal to the first direction, the range in which the protrusions are distributed in the first direction is wide, so that contact of the medium with the ejection surface can be prevented. The effect of each is remarkable.

[Aspect 4]
In a preferred example (Aspect 4) of any one of Aspects 1 to 3, a plurality of protrusions are provided in a region where a plurality of nozzles are distributed. In the aspect 4, since a plurality of projections are installed in a region where a plurality of nozzles are distributed, for example, a configuration in which a projection is formed only outside a region where a plurality of nozzles are distributed, or one projection in the region Compared to the configuration in which only the portion is formed, the above-described effect of preventing the medium from contacting the ejection surface is particularly remarkable.

[Aspect 5]
In a preferred example (aspect 5) of aspect 4, the plurality of protrusions are installed on a single member. In the aspect 5, since the plurality of protrusions are installed on a single member, the plurality of protrusions can be installed at a higher density than the configuration in which the plurality of protrusions are distributed and installed on the plurality of members. Therefore, the above-described effect that the medium can be prevented from coming into contact with the ejection surface is remarkable.

[Aspect 6]
In a preferred example (Aspect 6) of Aspect 4 or Aspect 5, the plurality of protrusions are formed symmetrically with respect to an axis perpendicular to the first direction. In the aspect 6, since the plurality of protrusions are formed in line symmetry with respect to the axis orthogonal to the first direction, there is an advantage that the medium can be prevented from contacting the ejection surface over a wide range in the first direction.

[Aspect 7]
In a preferred example (aspect 7) of any one of Aspects 1 to 6, the height of the protrusion with respect to the ejection surface exceeds the thickness of the substrate including the ejection surface. In aspect 7, since the height of the protrusion is ensured to the extent that it exceeds the plate thickness of the substrate including the ejection surface, the contact of the medium with the ejection surface compared to a configuration in which the height of the projection is less than the plate thickness of the substrate There is an advantage that can be prevented.

[Aspect 8]
The line head according to any one of the preferred examples (aspect 8) of Aspect 1 to Aspect 7 includes a storage chamber that stores liquid ejected from a plurality of nozzles, and the protrusion overlaps the storage chamber in plan view. Installed. In the aspect 8, since the region that overlaps the storage chamber in plan view is used for forming the protrusion, the plurality of nozzles N are arranged at a higher density than the configuration in which the protrusion and storage chamber do not overlap in plan view. It is possible.

[Aspect 9]
The line head according to any one of the preferred examples (aspect 9) of Aspect 1 to Aspect 8 vibrates the storage chamber that stores liquid ejected from a plurality of nozzles and the elastic film that absorbs pressure fluctuations in the storage chamber. And the protrusion is installed at a position that does not overlap the damper chamber in plan view. In the aspect 9, since the protrusion is formed so as not to overlap the damper chamber in a plan view, for example, compared to a configuration in which the protrusion and the damper chamber overlap in a plan view, the characteristics of the damper chamber due to the protrusion ( For example, there is an advantage that an error in intensity characteristics is reduced.

[Aspect 10]
In a preferred example (aspect 10) of any one of the aspects 1 to 9, the protrusion is formed integrally with the substrate by drawing the substrate including the ejection surface. In the aspect 10, since the protrusion is formed integrally with the substrate by drawing the substrate including the ejection surface, the number of parts of the line head can be reduced and the manufacturing and fixing can be simplified.

[Aspect 11]
In a preferred example (Aspect 11) of any one of Aspects 1 to 9, the protrusion is formed separately from the substrate including the ejection surface and is fixed to the substrate. In aspect 11, since a protrusion separate from the substrate including the ejection surface is fixed to the substrate, for example, it is possible to suppress deformation of the substrate (decrease in flatness due to drawing) compared to aspect 10. There are advantages.

[Aspect 12]
In a preferred example (Aspect 12) of any one of Aspects 1 to 11, the angle of the end face in the longitudinal direction of the protrusion with respect to the injection surface is smaller than the angle of the side surface of the protrusion with respect to the injection surface. In the aspect 12, since the angle of the end face in the longitudinal direction of the protrusion is smaller than the angle of the side face, for example, the injection surface and the end face intersect each other compared to the configuration in which the end face of the protrusion is steep with respect to the injection surface. It is possible to reduce the possibility that the leading edge of the medium is locked to the corner (the possibility that the medium is deformed).

[Aspect 13]
A liquid ejecting apparatus according to a preferred aspect (aspect 13) of the present invention includes the line head according to any one of aspects 1 to 12, and a transport mechanism that transports the medium in a direction orthogonal to the first direction. A good example of the liquid ejecting apparatus is a printing apparatus that ejects ink onto a medium such as printing paper, but the application of the liquid ejecting apparatus according to the present invention is not limited to printing.

1 is a configuration diagram of a printing apparatus according to a first embodiment of the present invention. FIG. 3 is a configuration diagram of a printing apparatus that pays attention to conveyance of a medium. FIG. 6 is a plan view of a surface facing a medium in the liquid ejecting unit. FIG. 3 is an exploded perspective view of a liquid ejecting head. It is sectional drawing of the part corresponding to one nozzle among liquid injection parts. It is a block diagram (six-face drawing) of a fixed plate. It is explanatory drawing (sectional drawing of the VII-VII line of FIG. 6) of the relationship between a stationary plate and a liquid injection part. It is an enlarged view of a projection part. It is explanatory drawing of the relationship between a sealing mechanism (cap) and a liquid jet head. It is explanatory drawing of the relationship between the stationary plate and liquid injection part in 2nd Embodiment. It is a perspective view of the projection part of 2nd Embodiment. It is explanatory drawing of the relationship between the stationary plate and liquid injection part in the modification of 2nd Embodiment. It is a top view of the 2nd surface of a fixed board in a 3rd embodiment. It is a top view of the 2nd surface of a fixed board in the modification of a 3rd embodiment. It is a top view of the 2nd surface of a fixed board in the modification of a 3rd embodiment. It is a top view of the 2nd surface of the fixed board in a 4th embodiment. FIG. 10 is a plan view of an ejection surface of a liquid ejection unit in a fifth embodiment. It is a top view of the injection surface in the modification of 5th Embodiment. It is a top view of the ejection surface of the liquid ejection unit in a 6th embodiment. It is explanatory drawing of the planar shape of the projection part which concerns on a modification. It is explanatory drawing of the cross-sectional shape of the projection part which concerns on a modification. It is a top view of the 2nd surface of the fixed board in a modification.

<First Embodiment>
FIG. 1 is a partial configuration diagram of an ink jet printing apparatus 10 according to a first embodiment of the present invention. The printing apparatus 10 according to the first embodiment is a liquid ejecting apparatus that ejects ink, which is an example of liquid, onto a medium (ejecting target) 12 such as printing paper, and includes a control device 22, a transport mechanism 24, and a liquid ejecting unit 26. It has. The printing apparatus 10 is provided with a liquid container (cartridge) 14 that stores ink.

  The control device 22 comprehensively controls each element of the printing apparatus 10. The transport mechanism 24 transports the medium 12 in the Y direction under the control of the control device 22. FIG. 2 is a configuration diagram of the printing apparatus 10 focusing on the conveyance of the medium 12. As illustrated in FIGS. 1 and 2, the transport mechanism 24 includes a first roller 242 and a second roller 244. The first roller 242 is disposed on the negative side in the Y direction (upstream in the transport direction of the medium 12) as viewed from the second roller 244 and transports the medium 12 to the second roller 244 side. The second roller 244 The medium 12 supplied from one roller 242 is conveyed to the positive side in the Y direction. However, the structure of the transport mechanism 24 is not limited to the above examples.

  As illustrated by a broken line in FIG. 2, the medium 12 may be deformed (for example, curled) toward the liquid ejecting unit 26 between the first roller 242 and the second roller 244. For example, assuming that the medium 12 is sequentially reversed and ink is ejected on both sides (double-sided printing), the deformation of the medium 12 becomes particularly apparent when the ink is ejected on only one side. If the ink is sufficiently dried with one side printed, the deformation of the medium 12 can be suppressed. However, for example, when performing high-speed printing in which a large number of media 12 are printed in a short time, a sufficient drying time can be ensured. In practice, it is difficult to transport the medium 12 in the deformed state toward the liquid ejecting unit 26 by the transport mechanism 24.

  The liquid ejecting unit 26 in FIG. 1 ejects ink supplied from the liquid container 14 onto the medium 12 under the control of the control device 22. The liquid ejecting unit 26 of the first embodiment is a line head that is long in the X direction (first direction) orthogonal to the Y direction. FIG. 3 is a plan view of a surface of the liquid ejecting unit 26 facing the medium 12 (hereinafter referred to as “ejection surface”). As illustrated in FIG. 3, a plurality of nozzles (ejection holes) N are installed on the ejection surface of the liquid ejection unit 26. The liquid ejecting unit 26 is disposed so as to face the medium 12 with a predetermined interval in a state where the ejecting surface is parallel to the XY plane. In parallel with the transport of the medium 12 by the transport mechanism 24, the liquid ejecting unit 26 ejects ink onto the medium 12, thereby forming a desired image on the surface of the medium 12. A direction perpendicular to the XY plane (for example, a plane parallel to the surface of the medium 12 without deformation) is hereinafter referred to as a Z direction. The ink ejection direction (for example, downward in the vertical direction) by the liquid ejection unit 26 corresponds to the Z direction. Further, the short side direction of the region R in which the plurality of nozzles N are distributed in the ejection surface of the liquid ejection unit 26 corresponds to the Y direction, and the longitudinal direction of the region R corresponds to the X direction. In the scene where the deformed medium 12 is conveyed as illustrated by the broken line in FIG. 2, the medium 12 may come into contact with the ejection surface of the liquid ejection unit 26.

  As illustrated in FIG. 3, the liquid ejecting unit 26 according to the first embodiment includes a plurality (six in the first embodiment) of liquid ejecting heads 30. Each liquid ejecting head 30 ejects ink supplied from the liquid container 14 from a plurality of nozzles N. As illustrated in FIG. 3, the plurality of liquid ejecting heads 30 are fixed to a housing (not shown) of the liquid ejecting unit 26 in a state of being arranged along the X direction.

  FIG. 4 is an exploded perspective view of an arbitrary one liquid ejecting head 30 constituting the liquid ejecting unit 26. As illustrated in FIG. 4, the liquid ejecting head 30 according to the first embodiment includes a plurality (six in the first embodiment) of liquid ejecting units 32, a support body 34, a flow path structure 36, and a fixing plate 38. It has. The support 34 is a housing that accommodates and supports the plurality of liquid ejecting units 32, and is formed by, for example, injection molding of a resin material or die casting of a metal material. The flow path structure 36 is a structure in which a flow path for distributing the ink supplied from the liquid container 14 to the plurality of liquid ejecting units 32 is formed. For example, the flow path structure 36 is for controlling the opening / closing of the flow path or the pressure. It includes a valve structure and a filter for collecting bubbles and foreign matters mixed in the ink in the flow path. It is also possible to integrally form the support body 34 and the flow path structure 36.

  Each liquid ejecting unit 32 is a head chip that ejects ink from a plurality of nozzles N. As illustrated in FIG. 3, the plurality of nozzles N of each liquid ejecting unit 32 are arranged in two rows along the W direction that intersects the X direction. As illustrated in FIG. 3, the W direction of the first embodiment is a predetermined angle (for example, an angle within a range of 30 ° to 60 °) with respect to the X direction and the Y direction in the XY plane. It is a direction to incline. In the first embodiment, as illustrated in FIG. 3, the pitches of the plurality of nozzles N are set so that the pitch in the X direction (specifically, the distance between the centers of the nozzles N) PX is narrower than the pitch PY in the Y direction. The position is selected (PX <PY). As described above, in the first embodiment, since the plurality of nozzles N are arranged in the W direction inclined with respect to the Y direction in which the medium 12 is conveyed, for example, the plurality of nozzles N are arranged along the X direction. Compared with the configuration described above, it is possible to increase the substantial resolution (dot density) of the medium 12 in the X direction.

  FIG. 5 is a cross-sectional view (a cross section perpendicular to the W direction) of a portion corresponding to any one nozzle N in each liquid ejecting unit 32. As illustrated in FIG. 5, the liquid ejecting unit 32 according to the first embodiment includes the pressure chamber substrate 42, the vibration plate 43, the housing 44, and the sealing plate on one side (the negative side in the Z direction) of the flow path substrate 41. 45 is disposed, and the nozzle plate 46 and the compliance portion 47 are disposed on the other side. Each element of the liquid ejecting section 32 is a substantially flat plate member that is long in the W direction, and is fixed to each other with an adhesive, for example. In FIG. 5, a portion corresponding to one nozzle N in the liquid ejecting unit 32 is illustrated for convenience, but the structure of FIG. 5 is actually formed in line symmetry with respect to the symmetry axis parallel to the W direction. The

  The nozzle plate 46 in FIG. 5 is a substrate on which a plurality of nozzles N are formed. The nozzle plate 46 of the first embodiment is a flat plate that is long in the W direction, as can be seen from FIG. 4, and is formed of, for example, a silicon single crystal substrate. Specifically, as illustrated in FIG. 3, a plurality of nozzles N arranged in two rows along the W direction are formed on the nozzle plate 46 of each liquid ejecting unit 32.

  The flow path substrate 41 in FIG. 5 is a flat plate material that constitutes the ink flow path. In the flow path substrate 41 of the first embodiment, an opening 412, a supply flow path 414, and a communication flow path 416 are formed. The supply flow path 414 and the communication flow path 416 are through holes formed for each nozzle N, and the opening 412 is a through hole continuous over a plurality of nozzles N. A space in which the accommodating portion (concave portion) 442 formed in the housing 44 and the opening 412 of the flow path substrate 41 are communicated with each other is supplied from the liquid container 14 via the introduction flow path 443 of the housing 44. It functions as a storage chamber (reservoir) SR for storing ink.

  The compliance unit 47 in FIG. 5 is an element for suppressing the pressure fluctuation of the ink in the storage chamber SR, and includes an elastic film 472 and a support plate 474. The elastic film 472 is a flexible member formed in a film shape, and constitutes a wall surface (specifically, a bottom surface) of the storage chamber SR. The support plate 474 is a flat plate made of a highly rigid material such as stainless steel, and the elastic film 472 is placed on the surface of the flow path substrate 41 so that the opening 412 of the flow path substrate 41 is closed by the elastic film 472. To support. An opening 476 is formed in a region of the support plate 474 that overlaps the storage chamber SR with the elastic film 472 interposed therebetween. In the space inside the opening 476 of the support plate 474 (hereinafter referred to as “damper chamber”) SD, the elastic film 472 is deformed according to the pressure of the ink in the storage chamber SR, thereby suppressing the pressure fluctuation in the storage chamber SR ( Absorbed). That is, the damper chamber SD functions as a space for deforming the elastic film 472 so that the pressure fluctuation in the storage chamber SR is absorbed.

  An opening 422 is formed for each nozzle N in the pressure chamber substrate 42 of FIG. The vibration plate 43 is a flat plate material that can vibrate elastically, and is fixed to the surface of the pressure chamber substrate 42 opposite to the flow path substrate 41. The space between the diaphragm 43 and the flow path substrate 41 inside each opening 422 of the pressure chamber substrate 42 is a pressure chamber (in which the ink supplied from the storage chamber SR via the supply flow path 414 is filled). Cavity) Functions as SC. Each pressure chamber SC communicates with the nozzle N via the communication channel 416 of the channel substrate 41. A piezoelectric element 432 is formed for each nozzle N on the surface of the vibration plate 43 opposite to the pressure chamber substrate 42. Each piezoelectric element 432 is a drive element in which a piezoelectric layer is interposed between electrode layers facing each other. The plurality of piezoelectric elements 432 are sealed with a sealing plate 45.

  The plurality of liquid ejecting units 32 having the structure exemplified above are fixed to the fixing plate 38 of FIG. FIG. 6 is a configuration diagram (six views) of the fixing plate 38. As illustrated in FIGS. 4 and 6, the fixing plate 38 of the first embodiment includes a support portion 382 and a plurality of peripheral portions 384. The support portion 382 is a flat plate-like portion including a first surface Q1 and a second surface Q2 that are located on opposite sides of each other. As illustrated in FIG. 6, the support portion 382 according to the first embodiment has a rectangular shape (specifically, parallel) defined by a pair of edges extending in the W direction and a pair of edges extending in the X direction. A quadrilateral shape). The first surface Q1 of the support portion 382 is a negative surface in the Z direction, and the second surface Q2 is a positive surface (medium 12 side) in the Z direction. The second surface Q2 of the support portion 382 is water repellent. On the other hand, each peripheral edge portion 384 is a portion that is continuous with each edge of the support portion 382 and is bent to the negative side in the Z direction so as to be substantially orthogonal to the first surface Q1 or the second surface Q2 of the support portion 382. is there. For example, the support portion 382 and the plurality of peripheral portions 384 are integrally configured by bending a flat plate formed into a predetermined shape with a highly rigid material such as stainless steel.

  FIG. 7 is an explanatory diagram of the relationship between the fixed plate 38 (supporting portion 382) and each liquid ejecting portion 32, and corresponds to a cross-sectional view taken along line VII-VII in FIG. As illustrated in FIGS. 4 and 7, the plurality of liquid ejecting units 32 of the liquid ejecting head 30 are fixed to the first surface Q <b> 1 of the support portion 382 of the fixing plate 38 using, for example, an adhesive. As described above, in a state where the plurality of liquid ejecting parts 32 are fixed to the first surface Q1 of the support part 382, each peripheral edge part 384 of the fixing plate 38 is fixed to the support body 34 using an adhesive, for example. The plurality of liquid jet heads 30 having the structure exemplified above are arranged in the X direction with the second surface Q2 of the fixed plate 38 facing the positive side in the Z direction, as illustrated in FIG. As understood from the above description, the plane formed by the second surfaces Q2 of the plurality of liquid ejecting heads 30 corresponds to the ejecting surface.

  As illustrated in FIGS. 6 and 7, a plurality (six) of openings 52 corresponding to the different liquid ejecting units 32 of the liquid ejecting head 30 are formed in the support portion 382 of the first embodiment. The plurality of openings 52 are arranged in the X direction at predetermined intervals. Each opening 52 is a long through hole extending along the W direction in a plan view (viewed from a direction perpendicular to the Z direction). As illustrated in FIG. 3, each liquid ejecting section 32 is fixed to the first surface Q <b> 1 of the support section 382 in a state where the nozzle plate 46 of each liquid ejecting section 32 is positioned inside one opening 52. As understood from the above description, each opening 52 of the fixing plate 38 is a through hole for exposing the plurality of nozzles N of each liquid ejecting section 32. As illustrated in FIG. 7, in a space inside the opening 52 (specifically, a gap between the inner peripheral surface of the opening 52 and the outer peripheral surface of the nozzle plate 46), for example, a filler formed of a resin material 54 is filled. Therefore, there is an advantage that a possibility that a large amount of ink enters and stays in the space inside the opening 52 can be reduced as compared with the configuration in which the filler 54 is not formed. On the other hand, in the configuration in which the filler 54 is formed of a hydrophilic resin material, the ink ejected from each nozzle N tends to adhere to the surface of the filler 54.

  As illustrated in FIG. 7, in the first embodiment, the surface of the support plate 474 of the compliance portion 47 that is opposite to the elastic film 472 is fixed to the first surface Q <b> 1 of the fixing plate 38 with an adhesive, for example. That is, the opening 476 of the support plate 474 is closed by the first surface Q1 of the fixed plate 38. A space sandwiched between the elastic film 472 and the first surface Q1 inside the opening 476 of the support plate 474 functions as a damper chamber SD for vibrating the elastic film 472.

  As illustrated in FIGS. 6 and 7, a plurality of protrusions 60 are installed on the support portion 382 of the fixing plate 38. Each protrusion 60 protrudes from the second surface Q2 of the fixed plate 38 to the positive side in the Z direction (medium 12 side). As illustrated in FIG. 3, the plurality of protrusions 60 of the first embodiment are installed inside a region R where a plurality of nozzles N are distributed on the ejection surface. Specifically, each protrusion 60 is formed in a region between the openings 52 adjacent to each other in the X direction, and extends along the W direction like the openings 52. That is, each protrusion 60 is formed in a long shape (linear shape) in which the dimension in the W direction exceeds the dimension in the direction orthogonal to the W direction in the XY plane. The dimension (full length) of the protrusion 60 in the W direction is equal to the dimension of the opening 52 in the W direction. As understood from FIG. 6, the protrusion 60 is not formed in the region between each peripheral edge 384 (each edge of the support 382) and the opening 52 of the support 382 of the fixing plate 38. Therefore, it is possible to reduce the possibility of errors occurring in the positions of the opening 52 and the protrusion 60 and the positional relationship between them due to the bending of the peripheral edge portion 384. In addition, there is an advantage that the peripheral portion 384 can be easily bent as compared with the configuration in which the protruding portion 60 is formed between the peripheral portion 384 and the opening 52.

  Each protrusion 60 of the first embodiment is formed integrally with the fixing plate 38. Specifically, each protrusion 60 is formed by drawing the fixed plate 38. FIG. 8 is an enlarged view of any one protrusion 60. As illustrated in FIG. 8, the protruding portion 60 is a three-dimensional structure including an end surface 62 positioned on both ends in the W direction (that is, the longitudinal direction of the protruding portion 60) and side surfaces 64 positioned between both ends. . The top of the protrusion 60 where the side surfaces 64 intersect is formed into a curved surface. FIG. 8 shows a cross section parallel to the W direction and a cross section perpendicular to the W direction. As understood from the respective cross-sectional views, the angle θa of the end surface 62 of the protrusion 60 with respect to the second surface Q2 is smaller than the angle θb of the side surface 64 of the protrusion 60 with respect to the second surface Q2. That is, each end surface 62 of the protrusion 60 is a gentle inclined surface as compared with the side surface 64.

  As illustrated in FIG. 8, the height H of the protrusion 60 with respect to the second surface Q <b> 2 is substantially constant in a section other than the end surface 62 in the total length in the W direction. Specifically, the height H is maintained at a predetermined value over a section of 90% or more of the entire length of the protrusion 60 in the W direction. As illustrated in FIG. 8, the height H of the protrusion 60 exceeds the plate thickness T of the fixing plate 38 (support portion 382) (H> T). Specifically, the thickness T of the fixed plate 38 is about 0.08 mm, while the height H of the protrusion 60 is about 0.4 mm to 0.6 mm. As described above, since the second surface Q2 of the fixing plate 38 is water-repellent, the surface (each end surface 62 and each side surface 64) of each protrusion 60 formed on the second surface Q2 is also water-repellent. Is granted. Therefore, there is an advantage that the possibility of ink remaining on the surface of the protrusion 60 can be reduced.

  As illustrated in FIG. 7, each liquid ejecting section 32 is installed at a position that does not overlap each projecting section 60 in plan view. Specifically, the support plate 474 joined to the first surface Q1 of the fixed plate 38 in the liquid ejecting portion 32 does not overlap the projections 60 on the second surface Q2 side in plan view. Further, the damper chamber SD of each protrusion 60 does not overlap with each protrusion 60 in plan view. In the configuration in which the damper chamber SD of each projection 60 overlaps each projection 60 in plan view, the damper chamber SD communicates with the space inside the projection 60 and an error occurs in the characteristics (volume and pressure) of the damper chamber SD. there's a possibility that. In the first embodiment, since each projection 60 does not overlap the damper chamber SD in plan view, the characteristics of each damper chamber SD can be made uniform.

  The printing apparatus 10 according to the first embodiment includes a sealing mechanism (cap) 28 shown in FIG. In FIG. 9, the second surface Q2 of the fixing plate 38 and a cross-sectional view taken along the line IX-IX are shown. As understood from the cross-sectional view of FIG. 9, the sealing mechanism 28 of the first embodiment contacts the second surface Q <b> 2 (injection surface) of the fixing plate 38 when performing a maintenance operation such as cleaning of the plurality of nozzles N. And a plurality of sealing bodies 282 for sealing each nozzle N. In the first embodiment, it is assumed that two sealing bodies 282 are used for one liquid ejecting head 30. Each sealing body 282 is an elastic body in which a base portion 284 and a sealing portion 286 are integrally formed, and is formed by, for example, injection molding of a resin material.

  The base portion 284 is a flat plate portion, and the sealing portion 286 is an annular (specifically, rectangular frame shape) portion protruding from the periphery of the base portion 284. Each nozzle N is sealed when the top surface of the sealing portion 286 opposite to the base portion 284 contacts the second surface Q2 of the fixed plate 38. As illustrated in FIG. 9, the plurality of protrusions 60 of the fixing plate 38 are formed in regions other than the annular region (hereinafter referred to as “sealing region”) L that contacts the sealing body 282 on the second surface Q2. And does not overlap the sealing region L in plan view. Specifically, a plurality of protrusions 60 are formed in a region on the inner side of the inner periphery of the sealing region L (a region surrounded by the sealing region L) in plan view in the second surface Q2. As described above, in the first embodiment, since the protrusion 60 is not formed in the sealing region L of the second surface Q2 of the fixing plate 38, compared with the configuration in which the protrusion 60 is formed in the sealing region L. Thus, there is an advantage that each nozzle N can be sufficiently sealed by bringing the sealing body 282 (sealing portion 286) into close contact with the second surface Q2.

  As can be understood from the above description, in the first embodiment, the protrusion 60 is formed to protrude from the second surface Q2 of the fixing plate 38 to the positive side (medium 12 side) in the Z direction. As illustrated by the broken line, the medium 12 deformed (for example, curled) between the first roller 242 and the second roller 244 toward the liquid ejecting unit 26 protrudes before reaching the second surface Q2 of the fixed plate 38. The part 60 is contacted. Therefore, it is possible to reduce the possibility that the ink remaining on the surface of the fixing plate 38 in the vicinity of the opening 52 (particularly the filler 54) adheres to the medium 12.

  By the way, the closer the protrusion 60 is to the opening 52, the harder the ink remaining inside the opening 52 adheres to the medium 12. In the first embodiment, since the protrusion 60 is formed on the fixed plate 38 to which the liquid ejecting unit 32 is fixed, the fixed plate is compared with the configuration in which the protrusion 60 is formed on a separate element from the fixed plate 38. The distance between the 38 openings 52 and the protrusions 60 is shortened. Therefore, the above-described effect that the possibility that the ink remaining inside the opening 52 adheres to the medium 12 can be reduced remarkably. On the other hand, the fact that the distance between the opening 52 and the protrusion 60 of the fixing plate 38 is shortened means that the protrusion 60 necessary to prevent the ink remaining inside the opening 52 from adhering to the medium 12. This means that the height H is reduced. Therefore, a necessary distance (so-called platen gap) between the medium 12 and the fixed plate 38 is reduced, and as a result, there is an advantage that an error in ink landing position on the surface of the medium 12 is reduced.

  Further, as described above, the fixing plate 38 of the first embodiment is fixed to the nozzle plate 46 via members other than the nozzle plate 46 (specifically, the flow path substrate 41 and the compliance portion 47). That is, both the fixed plate 38 and the nozzle plate 46 are arranged on one side (the positive side in the Z direction) of the flow path substrate 41. Accordingly, for example, compared with a configuration in which the fixed plate 38 is directly bonded to the surface of the nozzle plate 46, the interval between the medium 12 and the nozzle plate 46 is reduced, and as a result, the ink landing position on the surface of the medium 12 is reduced. There is also an advantage that the error is reduced. In addition, since the plurality of liquid ejecting units 32 are fixed to the common fixing plate 38, for example, the positions of the liquid ejecting units 32 between each other compared to a configuration in which the liquid ejecting units 32 are fixed to individual members. There is an advantage that the relationship can be adjusted with high accuracy.

  In the first embodiment, since the height H of the protrusion 60 exceeds the thickness T of the fixed plate 38 (support portion 382) (H> T), for example, the height H of the protrusion 60 is the plate thickness of the fixed plate 38. Compared with the configuration below T, there is an advantage that the contact of the medium 12 with the second surface Q2 of the fixing plate 38 can be effectively prevented. Further, the gap between the inner peripheral surface of the opening 52 and the outer peripheral surface of the nozzle plate 46 (the volume of the space between them) is reduced, and the adhesion of ink to the surface of the filler 54 filled in the gap is reduced. Is possible.

  In the first embodiment, the configuration in which the plurality of protrusions 60 are formed in the region inside the inner peripheral edge of the sealing region L in the plan view of the second surface Q2 includes the opening 52 and the protrusions 60 of the fixing plate 38. This contributes to shortening the distance. Therefore, for example, the possibility that the ink remaining inside the opening 52 adheres to the medium 12 can be reduced as compared with the configuration in which the protrusion 60 is formed so as to be continuous with the peripheral edge 384 of the fixing plate 38. It is.

  In the configuration in which the angle θa of the end surface 62 of the protrusion 60 is steep (for example, close to a right angle), the tip of the medium 12 is locked to the corner formed by the end surface 62 and the second surface Q2, and the medium 12 is locked. Deformation such as wrinkles may occur. In the first embodiment, since the angle θa of the end face 62 is suppressed to an angle smaller than the angle θb of the side face 64, there is a possibility that the tip of the medium 12 is locked to the end face 62 (and thus the possibility of deformation of the medium 12). There is an advantage that can be reduced.

Second Embodiment
A second embodiment of the present invention will be described below. In addition, about the element which an effect | action and function are the same as that of 1st Embodiment in each form illustrated below, the code | symbol used by description of 1st Embodiment is diverted, and each detailed description is abbreviate | omitted suitably.

  FIG. 10 is an explanatory diagram of the relationship between the fixed plate 38 and each liquid ejecting unit 32 in the second embodiment, and corresponds to FIG. 7 of the first embodiment. In the first embodiment, the configuration in which the protrusion 60 is formed integrally with the fixing plate 38 is illustrated. However, in the second embodiment, as illustrated in FIG. 10, the protrusion formed separately from the fixing plate 38. The part 60 is fixed to the fixing plate 38.

  FIG. 11 is a perspective view of the protrusion 60 according to the second embodiment. 10 and 11, the upper and lower sides of the protrusion 60 are inverted. As illustrated in FIG. 11, the protrusion 60 according to the second embodiment is formed integrally with the elongated joint 68 by, for example, injection molding of a resin material, and protrudes from the surface 682 of the joint 68. The shape and dimensions of the protrusion 60 are the same as those in the first embodiment.

  On the other hand, as illustrated in FIG. 10, a through hole 56 extending along the W direction is formed for each protrusion 60 in the fixing plate 38 of the second embodiment. The lateral width of the through hole 56 is larger than the lateral width of the protrusion 60 and smaller than the lateral width of the joint 68. As illustrated in FIG. 10, the joint portion 68 is fixed to the first surface Q <b> 1 of the fixing plate 38. Specifically, the surface 682 on which the protrusion 60 is formed is fixed to the first surface Q1 with, for example, an adhesive so that the joint 68 does not overlap the liquid ejecting part 32 in plan view. In a state where the surface 682 of the joint portion 68 is fixed to the first surface Q1, the projecting portion 60 projects to the second surface Q2 side through the through hole 56.

  As described above, also in the second embodiment, since the protrusion 60 that protrudes from the second surface Q2 of the fixing plate 38 to the positive side in the Z direction (medium 12 side) is formed, the same as in the first embodiment. The effect of is realized. In the first embodiment in which the protrusion 60 is formed by drawing the fixing plate 38, the fixing plate 38 can be deformed due to the stress generated when the protrusion 60 is formed. In the second embodiment, however, the fixing portion 38 is fixed. Since the protrusion 60 separate from the plate 38 is fixed to the fixing plate 38 (therefore, drawing processing of the fixing plate 38 is unnecessary), the flatness of the fixing plate 38 is maintained compared to the first embodiment. There is an advantage that it is easy to manufacture the fixing plate 38 with high flatness. On the other hand, in the first embodiment, since the protrusion 60 is formed integrally with the fixing plate 38, the number of parts of the liquid ejecting head 30 is reduced and the manufacturing process is simplified (the separate protrusion 60 is attached to the fixing plate 38). Omission of the bonding step) is realized.

  In the second embodiment, the configuration in which the joint portion 68 provided with the protrusion 60 is joined to the first surface Q1 of the fixing plate 38 is illustrated. However, as illustrated in FIG. Even in the configuration in which the protrusion 60 formed on the body is joined to the second surface Q2 of the fixing plate 38, the same effect as in the second embodiment is realized. Further, in the configuration of FIG. 12, a sufficient area for adhering the protrusion 60 can be secured, so that the mechanical strength of the protrusion 60 can be easily ensured as compared to the second embodiment (due to the collision of the medium 12). The projection 60 can be prevented from dropping off. On the other hand, in the second embodiment, since the joint portion 68 on which the projection portion 60 is installed is joined to the first surface Q1 of the fixing plate 38, it is used for installing the projection portion 60 as compared with the configuration of FIG. There is an advantage that the adhesive does not easily protrude on the surface of the second surface Q2 (and thus the possibility that the nozzle N is blocked by the adhesion of the adhesive can be reduced).

<Third Embodiment>
FIG. 13 is a plan view of the second surface Q2 of the fixing plate 38 in the third embodiment. In the first embodiment and the second embodiment, the linear protrusion 60 in which the lateral width is maintained constant over substantially the entire W direction is illustrated. In the third embodiment, as illustrated in FIG. 13, the lateral width of the protrusion 60 changes according to the position in the W direction. Specifically, each protrusion 60 is formed in a shape in which the lateral width increases as it approaches the center from both ends in the W direction. On the other hand, each opening 52 is formed in a rectangular shape elongated in the W direction as in the first embodiment. Therefore, in the third embodiment, the distance D between the protrusion 60 and the opening 52 in the direction orthogonal to the W direction is smaller at the center than at the end of the protrusion 60. That is, the distance D between the protrusion 60 and the opening 52 is minimized at the center of the protrusion 60.

  As described above, the closer the protrusion 60 is to the opening 52, the more difficult the ink remaining inside the opening 52 adheres to the medium 12. Therefore, in the third embodiment, the effect of the protrusion 60 that prevents the ink remaining inside the opening 52 from adhering to the medium 12 is that the distance D between the protrusion 60 and the opening 52 is the relationship described above. As described above, the center portion is larger than both end portions of the protrusion 60. In the formation of the protrusion 60 of the third embodiment, it is formed integrally with the fixing plate 38 as in the first embodiment, or formed separately from the fixing plate 38 as in the second embodiment. Then, a method of fixing to the fixing plate 38 can be adopted.

  In the third embodiment, the same effect as in the first embodiment is realized. By the way, at the point in the vicinity of the central portion in the W direction on the ejection surface, it is far from the first roller 242 and the second roller 244 that hold the medium 12 (that is, the effect of suppressing the deformation of the medium 12 is relatively small). Therefore, there is a tendency that the deformation of the medium 12 is likely to occur. In the third embodiment, since the distance D between the protrusion 60 and the opening 52 at the center of the protrusion 60 exceeds the distance D at both ends, the deformation of the medium 12 that is particularly likely to occur at the center of the protrusion 60. There is an advantage that can be effectively suppressed.

<Modification of Third Embodiment>
FIG. 13 illustrates the configuration in which the lateral width at the center of the protrusion 60 is larger than that at both ends. However, the distance D between the protrusion 60 and the opening 52 in the direction orthogonal to the W direction is set as the protrusion 60. The configuration for reducing the center side in the W direction is not limited to the above examples. For example, as illustrated in FIG. 14, a configuration in which the width of the opening 52 (the dimension in the direction orthogonal to the W direction) is changed according to the position in the W direction may be employed. Specifically, each opening 52 is formed in a planar shape in which the lateral width increases as it approaches the center from both ends in the W direction. Even in the configuration of FIG. 14, the distance D between the protrusion 60 and the opening 52 becomes smaller toward the center of the protrusion 60, so the same effect as in the third embodiment is realized.

  In the third embodiment, it is assumed that the ink closer to the opening 52 is less likely to adhere to the medium 12 as the protrusion 60 is closer to the opening 52. Similarly, the protrusion 60 on the second surface Q2 is assumed. There is also a tendency that the ink inside the opening 52 is less likely to adhere to the medium 12 as the height H is higher. Assuming the latter tendency, for example, as illustrated in FIG. 15, it is also possible to form each protrusion 60 such that the height H is higher at the center than at both ends of the protrusion 60. is there. The same effects as those of the third embodiment are realized with the configuration of FIG.

<Fourth embodiment>
FIG. 16 is a plan view of the second surface Q2 of the fixing plate 38 in the fourth embodiment. As illustrated in FIG. 16, the plurality of protrusions 60 formed on the fixing plate 38 of the fourth embodiment include a plurality of first protrusions 60A and a plurality of second protrusions 60B. The plurality of first protrusions 60A are arranged in the X direction with a space between each other and each extend in the W direction. Similarly, the plurality of second protrusions 60B are arranged in the X direction at intervals, and each extends in the W direction. The first protrusions 60A and the second protrusions 60B are alternately arranged along the X direction.

  As illustrated in FIG. 16, the second surface Q2 (region R) of the fixing plate 38 of the fourth embodiment is conveniently divided into a first region R1, a second region R2, and a third region R3 in the Y direction. To do. The first region R1 is located on the positive side in the Y direction when viewed from the second region R2, and the third region R3 is located on the negative side in the Y direction when viewed from the second region R2. The first protrusion 60A extends in the W direction across the first region R1 and the second region R2, and is not formed in the third region R3. On the other hand, the second protrusion 60B extends in the W direction over the second region R2 and the third region R3, and is not formed in the first region R1. As understood from the above description, in the fourth embodiment, the first protrusion 60A and the second protrusion 60B are different in position in the Y direction where the medium 12 is conveyed, and are partially mutually in the Y direction. (Ie, limited within the second region R2). Each protrusion 60 is formed by a method of forming it integrally with the fixing plate 38 as in the first embodiment, or by forming it separately from the fixing plate 38 as in the second embodiment. A method of fixing to the substrate can be adopted.

  In the fourth embodiment, the same effect as in the first embodiment is realized. Further, in the fourth embodiment, the protrusion 60 is shortened as compared with the configuration in which the protrusion 60 extends in the W direction over the entire area of the second surface Q2, and thus the fixing plate 38 resulting from the formation of the protrusion 60 is provided. There is an advantage that the deformation (particularly, the deformation when the protrusion 60 is formed by drawing) can be suppressed. In the configuration in which the first projection 60A and the second projection 60B do not overlap along the Y direction (for example, the configuration in which neither the first projection 60A nor the second projection 60B is formed in the second region R2). 16, the medium 12 comes into contact with the second surface Q2 of the fixing plate 38, so that ink remaining inside the opening 52 may adhere to the medium 12. In the fourth embodiment, since the first protrusion 60A and the second protrusion 60B partially overlap each other in the Y direction, the second surface is not limited to the configuration in which the length of each protrusion 60 is shortened. There is an advantage that the contact of the medium 12 with Q2 can be effectively prevented.

<Fifth Embodiment>
FIG. 17 is a plan view of an ejection surface facing the medium 12 in the liquid ejection unit 26 of the fifth embodiment. As illustrated in FIG. 17, the liquid ejecting unit 26 of the fifth embodiment is a line head that is long in the X direction and includes a nozzle plate 72 that faces the medium 12. The nozzle plate 72 is a flat plate that is long in the X direction across the entire width of the medium 12.

  As illustrated in FIG. 17, a plurality of regions 74 arranged in the X direction are defined in the nozzle plate 72. Each region 74 is a trapezoidal region (specifically, an isosceles trapezoid) in a plan view. A plurality of regions 74 are defined such that the positional relationship between the upper base and the lower base is reversed between the regions 74 adjacent to each other in the X direction. In each region 74, a plurality of nozzles N are formed in the X direction and the Y direction. As understood from the above description, the surface of the nozzle plate 72 located on the positive side in the Z direction (the surface facing the medium 12) functions as an ejection surface on which a plurality of nozzles N are installed.

  As illustrated in FIG. 17, a plurality of protrusions 60 are formed on the ejection surface of the nozzle plate 72 of the fifth embodiment. Each protrusion 60 is formed along the direction (second direction) intersecting the X direction and protrudes from the ejection surface. Specifically, linear protrusions 60 are formed along the directions of the trapezoidal legs in the gaps between the regions 74 adjacent to each other in the X direction. That is, each protrusion 60 of the fifth embodiment extends along a direction inclined in the X direction. As illustrated in FIG. 17, the protrusions 60 adjacent to each other in the X direction have a line-symmetric relationship with respect to the axis A orthogonal to the X direction.

  The shape of each protrusion 60 is the same as the above-described embodiments. In addition, each protrusion 60 is formed by, for example, a method of forming the protrusion 60 integrally with the nozzle plate 72 by drawing the nozzle plate 72, or the protrusion 60 formed separately from the nozzle plate 72. A method of fixing to the ejection surface of the plate 72 may be employed.

  As illustrated in FIG. 17, the liquid ejection unit 26 of the fifth embodiment includes a plurality of storage chambers SR. Each storage chamber SR is a space for storing ink ejected from a plurality of nozzles N, as in the first embodiment. Specifically, the storage chamber SR is formed at a position corresponding to the apex of each region 74 in plan view (as viewed from the direction perpendicular to the ejection surface). Ink distributed to the plurality of flow paths from the storage chamber SR is ejected from each nozzle N. As is understood from FIG. 17, each protrusion 60 of the fifth embodiment is installed at a position overlapping the storage chamber SR in plan view. On the other hand, each nozzle N is formed at a position that does not overlap the storage chamber SR in plan view. As described above, in the fifth embodiment, the region overlapping the storage chamber SR in the plan view of the ejection surface (the region where the nozzle N is not originally formed) is effectively used for forming the protrusion 60. It is possible to arrange a plurality of nozzles N at a high density as compared with the configuration in which the protrusions 60 are formed so as not to overlap with SR.

  In the fifth embodiment exemplified above, the protrusion 60 protruding from the ejection surface on which the plurality of nozzles N are arranged is installed along the direction intersecting (orthogonal or inclined) in the X direction which is the longitudinal direction of the line head. Is done. Therefore, as compared with the configuration in which the protrusions 60 are formed along the X direction, there is an advantage that the contact of the medium 12 with the ejection surface can be prevented over a wide range in the Y direction in which the medium 12 is conveyed.

  FIG. 17 illustrates the configuration in which the protrusions 60 extend over the entire length of the gap between the regions 74 adjacent to each other in the X direction. However, as illustrated in FIG. It is also possible to form the protrusion 60 only on the part. In the configuration shown in FIG. 18, it is not necessary to secure a space for forming the protrusions 60 in the gaps between the regions 74, so that the plurality of nozzles N are arranged at a high density by arranging the regions 74 close to each other. There is an advantage that you can.

<Sixth Embodiment>
FIG. 19 is a plan view of an ejection surface facing the medium 12 in the liquid ejection unit 26 of the sixth embodiment. As illustrated in FIG. 19, the liquid ejecting units 26 of the sixth embodiment include a plurality of liquid ejecting heads 30 arranged in a staggered manner in the X direction (so-called staggered arrangement). Each of the plurality of liquid jet heads 30 includes a nozzle plate 72 in which a plurality of nozzles N are formed in the XY plane. A plurality of protrusions 60 are formed on the ejection surface of the nozzle plate 72 of each liquid ejection head 30 that faces the medium 12. Each protrusion 60 is formed along a direction intersecting (orthogonal or inclined) in the X direction and protrudes from the ejection surface. The shape and the forming method of each protrusion 60 are the same as those illustrated in the above embodiments. In the sixth embodiment, the same effects as those of the above-described embodiments are realized.

  The first to sixth embodiments exemplified above are comprehensively expressed as a configuration in which the protrusion 60 protruding from the ejection surface on which the plurality of nozzles N are installed, and is a member that forms the ejection surface. The function and usage are unquestioned. Regardless of whether the injection surface is formed by the fixed plate 38 as in the first to fourth embodiments, or whether the injection surface is formed by the nozzle plate 72 as in the fifth or sixth embodiment. The various configurations exemplified in the above-described embodiments (for example, the shape of the protrusion 60) are similarly applied.

<Modification>
The form illustrated above can be variously modified. Specific modifications are exemplified below. Two or more aspects arbitrarily selected from the following examples can be appropriately combined as long as they do not contradict each other.

(1) The planar shape of the protrusion 60 (the outer shape of the protrusion 60 as viewed from the Z direction) is not limited to the examples of the above-described embodiments. For example, it is also possible to form the planar protrusion 60 illustrated in FIG. The protrusion 60 of Example A1 has a rectangular shape (rectangular shape) in plan view, and the protrusion 60 of Example A2 has a bow shape (half moon shape). In the configuration of Example A2, when a wiper (not shown) that contacts the ejection surface (second surface Q2) is moved in a direction perpendicular to the W direction (left direction in FIG. 20) to wipe the ink on the ejection surface, The ink pressed by the wiper moves along the side surface of the protrusion 60 to the positive side and the negative side in the X direction as shown by the dashed arrows in FIG. Therefore, there is an advantage that ink remaining on the ejection surface (unwiping) is reduced. The same effect can be realized even in a configuration in which the planar protrusion 60 is formed in which the lateral width of the central portion exceeds both ends as illustrated in FIG. Further, as in example A3 in FIG. 20, it is also possible to form a projection 60 having a planar shape in which the lateral width of the central portion is lower than both end portions. Moreover, the structure which arranged the some projection part 60 along the W direction may be employ | adopted.

(2) The cross-sectional shape of the protrusion 60 (the shape of the surface of the protrusion 60 in the cross section perpendicular to the W direction) is not limited to the examples of the above-described embodiments. For example, it is possible to form the protrusion 60 having the cross-sectional shape illustrated in FIG. The protrusion 60 of Example B1 has a rectangular (rectangular) cross-sectional shape, and the protrusion 60 of Example B2 has a bow-shaped cross-section. Note that the cross-sectional shape of the protrusion 60 is not limited to a line-symmetric shape. For example, as in the example B3 of FIG. 21, the protrusion 60 having a triangular cross-sectional shape composed of the side surface 64A perpendicular to the injection surface (second surface Q2) and the side surface 64B inclined to the injection surface is formed. Is also possible. In the configuration in which the protrusion 60 includes an inclined surface with respect to the injection surface as in the above-described embodiment and Example B2 and Example B3 in FIG. 21, for example, it adheres to the injection surface compared to the configuration in Example B1 in FIG. There is an advantage that the ink thus wiped off can be effectively wiped off by the wiper.

(3) In each of the above-described embodiments, the protrusion 60 is formed in a region other than the sealing region L in contact with each sealing body 282 of the sealing mechanism 28 on the ejection surface of the fixed plate 38. As described above, a configuration in which at least a part of the protrusion 60 overlaps the sealing region L in a plan view may be employed. In FIG. 22, among the six protrusions 60 formed on one fixing plate 38, each protrusion 60 positioned at both ends in the X direction extends along the W direction in the sealing region L. The structure which overlaps an area | region by planar view is illustrated. In the configuration in which the protrusions 60 overlap the sealing region L, it is possible to form a large number of protrusions 60 on the fixing plate 38 without being restricted by the shape or size of the sealing region L. Therefore, as compared with the configuration in which the protrusion 60 is formed in a region other than the sealing region L, there is an advantage that the contact of the medium 12 with the ejection surface can be effectively prevented.

(4) In the first to fourth embodiments, the support plate 474 of the compliance unit 47 in each liquid ejecting unit 32 is fixed to the first surface Q 1 of the fixed plate 38. The member to be joined to is not limited to the support plate 474. For example, in the configuration in which the compliance unit 47 is installed in a location other than the surface facing the fixed plate 38 in the liquid ejecting unit 32 or the configuration in which the compliance unit 47 is omitted, the surface on the positive side in the Z direction of the flow path substrate 41 is used. It is also possible to fix to the first surface Q1 of the fixing plate 38 with an adhesive, for example.

(5) The method by which the liquid ejecting unit 32 ejects ink is not limited to the above-described method (piezo method) using a piezoelectric element. For example, the present invention can be applied to a liquid ejecting head of a system (thermal system) that uses a heating element that changes the pressure in the pressure chamber by generating bubbles in the pressure chamber by heating.

(6) The printing apparatus 10 exemplified in each of the above embodiments can be employed in various apparatuses such as a facsimile apparatus and a copying machine in addition to apparatuses dedicated to printing. However, the use of the liquid ejecting apparatus of the present invention is not limited to printing. For example, a liquid ejecting apparatus that ejects a solution of a coloring material is used as a manufacturing apparatus that forms a color filter of a liquid crystal display device. Further, a liquid ejecting apparatus that ejects a solution of a conductive material is used as a manufacturing apparatus that forms wiring and electrodes of a wiring board.

DESCRIPTION OF SYMBOLS 10 ... Printing apparatus (liquid ejecting apparatus), 12 ... Medium, 14 ... Liquid container, 22 ... Control apparatus, 24 ... Conveyance mechanism, 242 ... 1st roller, 244 ... 2nd roller, 26 ... ... Liquid ejecting unit, 28 ... Sealing mechanism, 282 ... Sealed body, 30 ... Liquid ejecting head, 32 ... Liquid ejecting section, 34 ... Support, 36 ... Channel structure, 38 ... Fixing plate, 382... Support portion, 384 .. peripheral edge portion, 41 .. flow path substrate, 42 .. pressure chamber substrate, 43 .. vibration plate, 44 .. casing, 45. 72: Nozzle plate, 47: Compliance part, 472 ... Elastic film, 474 ... Support plate, 52 ... Opening part, 54 ... Filler, 56 ... Through hole, 60 ... Projection part, 62 ... ... End face, 64 ... Side, 68 ... Joint part, Q1 ... First face, Q2 ... Second face, N ... Nozzle SR ...... storage chamber, SC ...... pressure chamber, SD ...... damper chamber.

Claims (11)

A line head elongated in the first direction,
A fixing plate including an ejection surface on which a plurality of nozzles for ejecting liquid are installed, and an opening that exposes the plurality of nozzles is formed along a second direction intersecting the first direction;
A protrusion that is installed along the second direction and protrudes from the ejection surface;
The width at the center of the protrusion is wider than the width at the end of the protrusion, and the distance between the protrusion and the opening in the direction orthogonal to the second direction is the end of the protrusion. The line head is smaller in the center. A line head elongated in the first direction,
A fixing plate including an ejection surface on which a plurality of nozzles for ejecting liquid are installed, and an opening that exposes the plurality of nozzles is formed along a second direction intersecting the first direction;
A protrusion that is installed along the second direction and protrudes from the ejection surface;
The width at the center of the opening is wider than the width at the end of the opening, and the distance between the protrusion and the opening in the direction orthogonal to the second direction is the end of the protrusion. The line head is smaller in the center. The line head according to claim 1 , wherein the plurality of nozzles are installed such that a pitch in the first direction is narrower than a pitch in a direction perpendicular to the first direction. The line head according to any one of claims 1 to 3 , wherein the second direction is a direction inclined with respect to the first direction. The line head according to any one of claims 1 to 4 , wherein the plurality of protrusions are installed in a region where the plurality of nozzles are distributed. The line head according to claim 5 , wherein the plurality of protrusions are installed on a single member. Wherein the plurality of protrusions claim 5 or line head according to claim 6 is formed symmetrically with respect to the axis perpendicular to the first direction. The protrusions may be any of the line head of claims 1 to 7 which is formed integrally with the fixing plate. The protrusions may be any of the line head of claims 1 7, wherein the fixing plate is fixed is formed on the fixing plate separately. The line head according to any one of claims 1 to 9 , wherein an angle of a longitudinal end surface of the protrusion with respect to the ejection surface is smaller than an angle of a side surface of the projection with respect to the ejection surface. A line head according to any one of claims 1 to 10 ,
A liquid ejecting apparatus comprising: a transport mechanism that transports a medium in a direction orthogonal to the first direction.

Images