JP5782706B2 - Liquid ejecting head, liquid ejecting head unit, and liquid ejecting apparatus - Google Patents

Description

  The present invention relates to a liquid ejecting head, a liquid ejecting head unit, and a liquid ejecting apparatus.

Conventionally, there has been known a liquid ejecting head that ejects liquid droplets from a nozzle by applying pressure to a liquid by a pressure generating means such as a piezoelectric element or a heat generating element. As a typical example, an ink droplet is ejected. An ink jet recording head.

As an ink jet recording head (unit), for example, a nozzle plate having nozzle openings for ejecting ink droplets, a pressure generating chamber communicating with the nozzle openings, and a reservoir (communication portion) communicating with a plurality of pressure generating chambers A plurality of head main bodies having a flow path forming substrate on which the flow paths are formed, and after positioning the nozzle plates of the plurality of head main bodies on the fixing plates, the head main bodies are fixed to the fixing plates with an adhesive. (See, for example, Patent Document 1).

Japanese Patent Laying-Open No. 2005-096419

However, when the head main body is fixed to the fixing plate in this way, the nozzle plate provided on the head main body may be peeled off. This is because the head body is obtained by fixing a plurality of substrates such as a flow path forming substrate using an adhesive, and these substrates are made of different materials. That is, since each substrate has a different linear expansion coefficient, when the environmental temperature is high, warping occurs in the longitudinal direction of the head body and stress occurs between the substrates laminated with the adhesive. It is considered that peeling occurs.

Accordingly, an object of the present invention is to solve the above-described problems of the prior art, and an attempt is made to provide a liquid ejecting head, a liquid ejecting head unit, and a liquid ejecting apparatus in which peeling between substrates constituting the head body is suppressed. To do.

The liquid jet head according to the present invention applies pressure to the nozzle plate in which a nozzle opening for jetting liquid is formed, a flow path forming substrate provided with a pressure generation chamber communicating with the nozzle opening, and the pressure generation chamber. A head main body including pressure generating means for ejecting liquid from the nozzle opening, and a fixing plate to which the head main body is fixed, and an exposed portion opening from which the nozzle opening is exposed to the fixing plate. A through hole formed in at least a part of the periphery of the opening of the exposed portion, and the through hole is a linear expansion of the laminated substrate including the flow path forming substrate, the nozzle plate, and the fixing plate. The stress acting on the fixed plate is reduced by the difference in coefficient .
In the liquid ejecting head of the present invention, since the through hole is provided in the fixed plate in addition to the exposed portion, the linear expansion coefficient is between any of the flow path forming substrate, the nozzle plate, and the laminated substrate including the fixed plate. Even if warping due to a difference occurs, the stress can be relieved by the through holes, and peeling of the laminated substrate can be suppressed.
Another liquid ejecting head according to the present invention includes a nozzle plate in which a nozzle opening for ejecting liquid is formed, a flow path forming substrate in which a pressure generating chamber communicating with the nozzle opening is provided, and pressure applied to the pressure generating chamber. A head main body including pressure generating means for applying and ejecting liquid from the nozzle opening; and a fixing plate to which the head main body is fixed. An exposed portion on which the nozzle opening is exposed on the fixing plate. An opening and a through hole formed in at least a part of the periphery of the exposed portion opening are provided.
In the liquid jet head of the present invention, since the through hole is provided in the fixed plate in addition to the exposed portion, warpage in the longitudinal direction occurs due to the difference in the linear expansion coefficient in the multilayer substrate such as the nozzle plate and the flow path forming substrate. Even if it does, the stress can be relieved.

As a preferred embodiment of the present invention, the through hole is a first through hole provided in at least a part of a peripheral edge of the exposed portion opening, or the through hole is an outer periphery of the exposed portion opening. It is mentioned that it is the 2nd through-hole provided in the at least one part of the side so that the said exposure part opening may become discontinuous.

The head main body includes a liquid storage part that communicates with the pressure generation chamber via a liquid channel and stores the liquid, and a sealing plate that seals the liquid storage part. A recess provided along the longitudinal direction of the sealing plate and a liquid introduction port extending from the edge of the recess toward the recess and introducing a liquid into the liquid storage portion were formed. It is preferable that the through hole is formed in the fixing plate so that at least a part of the through hole is opposed to the extended portion in a short direction of the head body in a top view. .

Since the region where the extending portion is provided has a high rigidity in the longitudinal direction of the sealing plate, a through hole is provided so as to face this high rigidity region in the short side direction of the head body in a top view. As a result, the rigidity of the entire head is made uniform.

A liquid jet head unit according to the present invention includes a plurality of the liquid jet heads according to any one of the above. The liquid ejecting head unit according to the present invention includes the liquid ejecting head that suppresses the peeling of the multilayer substrate that constitutes the head body based on the stress caused by the warp generated from the difference in the number of linear expansions. Is excellent.

The liquid ejecting apparatus according to the aspect of the invention includes the liquid ejecting head according to any one of the above. The liquid ejecting apparatus according to the aspect of the invention includes the liquid ejecting head that suppresses the peeling of the multilayer substrate that constitutes the head body based on the stress caused by the warp generated due to the difference in the number of linear expansions. Are better.

FIG. 3 is an exploded perspective view of a recording head according to an embodiment of the invention. FIG. 2 is an assembled perspective view of a recording head according to an embodiment of the invention. FIG. 3 is a cross-sectional view of a main part of a recording head according to an embodiment of the invention. It is a top view of the fixed plate concerning one embodiment of the present invention. 1 is a schematic diagram of a recording head according to an embodiment of the present invention. It is a partial expanded sectional view of the fixed board concerning one embodiment of the present invention. FIG. 3 is a top view of a recording head according to an embodiment of the invention. 1 is a liquid ejecting apparatus according to an embodiment of the present invention. It is a principal part enlarged view of the fixing plate which concerns on one Embodiment of this invention. FIG. 6 is a top view of a recording head according to another embodiment of the present invention.

Hereinafter, the present invention will be described in detail based on embodiments.
(Embodiment 1)
First, an ink jet recording head unit (hereinafter also simply referred to as a head unit), which is an example of a liquid ejecting head unit according to Embodiment 1 of the invention, will be described. In addition,
FIG. 1 is an exploded perspective view of an ink jet recording head unit according to Embodiment 1 of the present invention.

As shown in FIG. 1, the ink jet recording head unit 1 includes a plurality of ink jet recording heads 10 (hereinafter, four as an example in the present embodiment) that are examples of liquid ejecting heads (hereinafter referred to as “ink jet recording heads”).
And a holding member 60. The recording head 10 includes an ink jet recording head main body 20 (hereinafter simply referred to as “recording head main body”) and a fixing plate 70 that is fixed with an adhesive after each recording head main body 20 is positioned. ing.

The holding member 60 includes, for example, a flow path member formed of a resin material and having a circuit board and an ink communication path formed therein. Ink supply needles 61 (eight as an example in the present embodiment) are fixed to the upper surface of the holding member 60 (the surface opposite to the recording head main body 20). The ink supply needle 61 is joined to a tube connected to an ink cartridge (not shown) in which each color ink is stored. One end of the ink communication path communicates with the ink supply needle 61. The other end of the ink communication path opens to the recording head main body 20 side (the bottom surface side of the holding member 60). That is, ink is supplied from the ink cartridge to the ink communication path via the ink supply needle 61, and the supplied ink is supplied to the recording head main body 20 via the ink introduction path as will be described in detail later.

A plurality of recording head main bodies 20 positioned at predetermined intervals are fixed to the bottom surface of the holding member 60. Each recording head body 20 is provided corresponding to each color ink.

In this case, the recording heads 10 are arranged in a staggered manner in the first direction, which is the longitudinal direction of the recording head, so that nozzle rows that are elongated at the same pitch in the first direction can be formed. . Here, the recording heads 10 are arranged in a staggered manner in which a plurality of recording heads 10 are arranged in parallel in the first direction, which is also the direction in which nozzle openings 26 (see FIG. 2) described later are arranged. And a row composed of a plurality of (two) recording heads 10 arranged in parallel in the first direction is:
Two rows are provided side by side in the second direction intersecting the direction in which the nozzle openings are arranged in parallel (first direction). The two rows of the recording heads 10 arranged in parallel in the second direction are arranged at positions slightly shifted from each other in the first direction. In the two rows of print heads 10, the adjacent print heads 10 include nozzle openings on the end side of the nozzle row of the print head 10 in one row,
The nozzle openings on the end side of the nozzle row of the recording head 10 in the other row are provided so as to be at the same position in the first direction of the nozzle openings. As a result, a plurality of recording heads 10 (in the present embodiment, four recording heads 10), nozzle openings are arranged in parallel at the same pitch along the first direction by the number of the four recording heads 10, and the nozzle rows are continuous. Printing can be performed over a wide area with the width of the continuous nozzle row.

Hereinafter, an example of the configuration of the recording head 10 will be described with reference to FIGS. 2 is an exploded perspective view of the recording head according to Embodiment 1 of the present invention, and FIG. 3 is a cross-sectional view at the center in the longitudinal direction of the pressure generating chamber of the recording head.

As shown in FIGS. 2 and 3, the flow path forming substrate 21 constituting the recording head main body 20 is provided with two rows in which a plurality of pressure generating chambers 22 are arranged in the width direction. In addition, a communication portion 23 is formed in a region outside the longitudinal direction of the pressure generation chambers 22 in each row, and the communication portion 23 and each pressure generation chamber 22 are provided with an ink supply path 24 provided for each pressure generation chamber 22 and It communicates via the communication path 25.

On one surface of the flow path forming substrate 21, a nozzle plate 27 having a nozzle opening 26 communicating with the vicinity of the end of each pressure generating chamber 22 on the side opposite to the ink supply path 24 is joined.
The nozzle openings 26 are arranged in a row. The longitudinal direction of the nozzle row in which the nozzle openings 26 are arranged is the first direction in the present embodiment.

On the other hand, a piezoelectric element 30 is formed on the surface of the flow path forming substrate 21 opposite to the nozzle plate 27 via an elastic film 28 and an insulator film 29. The piezoelectric element 30 includes a first electrode 31 and
A piezoelectric layer 32 and a second electrode 33 are included. A lead electrode 34 extending to the insulator film 29 is connected to the second electrode 33 constituting each piezoelectric element 30. One end of the lead electrode 34 is connected to the second electrode 33, and the other end is a flexible wiring member (COF substrate), and a driving wiring 35 on which a driving IC 35 a for driving the piezoelectric element 30 is mounted. Connected with. Thus, the lead electrode 34 is connected to one end side of the drive wiring 35, and the other end side of the drive wiring 35 is fixed to a circuit board (not shown) provided in the cartridge case.

On the flow path forming substrate 21 on which such a piezoelectric element 30 is formed, a protective substrate 37 provided with a piezoelectric element holding portion 36 which is a space for protecting the piezoelectric element 30 in a region facing the piezoelectric element 30. Are joined by an adhesive 38. The protective substrate 37 is provided with a manifold portion 39. In the present embodiment, the manifold portion 39 is the flow path forming substrate 21.
A manifold (liquid storage part) 40 that is in communication with the communication part 23 and serves as an ink chamber common to the pressure generation chambers 22 is formed.

The protective substrate 37 is provided with a through hole 41 that penetrates the protective substrate 37 in the thickness direction. In the present embodiment, the through hole 41 is provided between the two piezoelectric element holding portions 36. The vicinity of the end portion of the lead electrode 34 drawn out from each piezoelectric element 30 is provided so as to be exposed in the through hole 41.

Furthermore, a compliance substrate (sealing substrate) 46 including a sealing film 44 and a reinforcing plate 45 that reinforces the sealing film 44 is bonded onto the protective substrate 37. Here, the sealing film 44 is made of a material having low rigidity and flexibility, and one surface of the manifold portion 39 is sealed by the sealing film 44. By sealing one surface of the manifold portion 39 with the sealing film 44 in this way, for example, the sealing film 44 generates pressure generated when ink on the upstream side of the manifold 40 flows into the manifold 40. The ink can be absorbed, and ink can be prevented from being accidentally ejected from the nozzle opening 26. The reinforcing plate 45 is formed of a hard material such as metal. Since the region of the reinforcing plate 45 facing the manifold 40 is an opening 47 that is completely removed in the thickness direction, one surface of the manifold 40 is sealed only with a flexible sealing film 44. Has been. That is, the compliance substrate 46 has the opening 4
It is comprised so that 7 may become a recessed part.

An extended portion 47 a extending from the edge of the opening 47 is provided at the center of the opening 47 in the longitudinal direction so as to protrude from the opening 47. The extended portion 47 a is provided with an ink introduction port 48 serving as an inlet for introducing ink flowing from the upstream side of the manifold 40 into the manifold 40. That is, since the ink introduction port 48 cannot be formed because the sealing film 44 does not have rigidity, the extending portion 47a is provided in the reinforcing plate 45, and the ink introduction port 48 is provided in the extending portion 47a. ing. Thus, the width of the opening 47 is the extended portion 47a.
The rigidity in the longitudinal direction of the compliance substrate 46 is increased in the vicinity where the extended portion 47a is provided. Therefore, in the longitudinal direction of the recording head main body 20, there are places around the ink inlet 48 that are more rigid than the other parts of the opening 47.

A head case 49 is fixed on the compliance substrate 46. The head case 49 is provided with an ink introduction path 50 that communicates with the ink introduction port 48 and supplies ink from a storage unit such as a cartridge to the manifold 40. Further, the head case 49 is provided with a holding hole 51 that holds a wiring member that communicates with the through hole 41 provided in the protective substrate 37, and the drive wiring 35 is inserted in the holding hole 51 in the state where the driving hole 35 is inserted. One end side is connected to the lead electrode 34.

In addition, a fixing plate 70 bonded with an adhesive layer (not shown) is provided on the surface of the nozzle plate 27 opposite to the pressure generating chamber 22. The bottom surface of the fixed plate 70 is configured to have a rectangular shape that is larger than the outer shape of the nozzle plate 27 serving as the bottom surface of the recording head body 20.
A mold member 52 (see FIG. 3) is provided at a corner portion formed by the upper surface of the fixed plate 70 and the outer peripheral edge portion of the recording head main body 20. In this embodiment, the mold member 52 is provided over the bonding surface between the nozzle plate 27 and the flow path forming substrate 21, so that the ink passes through the adhesive layer and the nozzle plate 27 and the flow path forming substrate. It is prevented from sneaking between the two.

A rectangular exposed portion opening 71 is formed on the bottom surface of the fixed plate 70 so that the nozzle opening 26 is exposed. The edge of the fixed plate 70 is bent and rises toward the recording head main body 20 to form a wall shape. That is, the fixing plate 70 has a box shape having a side wall portion.

The side wall portion of the fixed plate 70 covers the outer peripheral side of the recording head body 20 near the nozzle plate 27. If the corners on the bottom side of the recording head main body 20 are exposed as they are, for example, paper is caught when the paper is fed, and foreign matters enter the laminated portion where the flow path is formed. Although it is likely to occur, the corner on the bottom surface side of the recording head main body 20 is thus fixed to the fixing plate 7.
These problems can be suppressed because 0 is protected.

In the present embodiment, the side wall portion of the fixed plate 70 is described as being integral with the bottom surface of the fixed plate 70, but it is not necessarily integral. The flat plate portion serving as the bottom surface portion and the side wall portion arranged so as to cover the side surface of the recording head main body 20 may be separated. In this case, the portion of the fixed plate 70 that contacts the nozzle plate 27 is a flat plate portion, and the side wall portion is the recording head body 20.
It may be fixed to the side wall with an adhesive, or may be formed integrally with the holding member 60.

The fixing plate 70 will be described in detail with reference to FIG.
In the present embodiment, a rectangular exposed portion opening 71 and a pair of first slits (first through holes) 72 are formed in a part of the peripheral portion of the exposed portion opening 71 on the bottom surface of the fixed plate 70. Yes.

The first slit 72 is formed at the central portion in the longitudinal direction of the peripheral portion of the exposed portion opening 71 so as to be continuous with the peripheral portion of the exposed portion opening 71. The first slit 72 has an exposed portion opening 7.
1 are provided opposite to each other. The first slit 72 has a rectangular shape. The recording head main body 20 is fixed to the fixed plate 70 across the outer periphery of the first slit 72 and the exposed portion opening 71.
A first region 74a to which an adhesive is applied to adhere to the first region 74a is provided. The first region 74 a is slightly smaller than the nozzle plate 27 that forms the bottom surface of the recording head main body 20.

Further, on the outer peripheral side of the fixing plate 70 from the first region 74a, the mold member 52 is disposed.
A second region 74b to which (see FIG. 3) is applied is formed. The second region 74b is wider than the first region 74a, and when the nozzle plate 27 is bonded to the fixed plate 70,
In the second region 74b, the nozzle plate 27 is bonded to the upper surface of the inner peripheral side. And when the nozzle plate 27 is bonded to the inner peripheral side of the outer peripheral side which is the remaining part of the second region 74b,
The mold member 52 applied to the outer peripheral side rises (see FIG. 3), and can be provided over the bonding surface between the nozzle plate 27 and the flow path forming substrate 21. It is possible to prevent wrapping between the nozzle plate 27 and the flow path forming substrate 21 through the adhesive layer. A second slit (second through hole) 73 is provided opposite to the first slit 72 on the outer peripheral side of the fixed plate 70 with respect to the second region 74b. That is, the second slit 73 is provided discontinuously with the first slit 72 and the exposed portion opening 71. Further, the entire periphery of the second slit 73 is defined by the bottom surface portion of the fixed plate 70.

The second slit 73 is a rectangular opening. Thus, by providing the second slit 73 on the outer peripheral side of the fixing plate 70 with respect to the first region 74 a, the first region 74 a is secured over the outer periphery of the first slit 72 and the exposed portion opening 71. The recording head body 20 can be fixed to the fixing plate 70 with a desired adhesive strength. Further, since the second slit 73 is provided on the outer peripheral side of the fixed plate 70 in the first region 74 a, the recording head main body 20 is provided on the fixed plate 70.
It is possible to prevent the adhesive from protruding from the second slit 73 to the outside of the fixing plate 70 (print medium side) when the is fixed.

Since the first slit 72 and the second slit 73 are provided in the fixed plate 70, the stress generated in the longitudinal direction of the recording head 10 can be suppressed as shown in FIG. That is, when the first slit and the second slit are not provided, as shown in FIG. 5A, for example, due to the difference in the linear expansion coefficient of the laminated substrate such as the nozzle plate of the recording head body 20 or the flow path forming substrate, When the warp occurs in the longitudinal direction of the recording head main body 20 when the temperature is high, the fixing plate 70 fixed to the recording head main body 20 follows the warp and curves in the longitudinal direction. In this case, a stress is generated in the direction opposite to the bending direction of the fixing plate 70 as the fixing plate 70 tries to return to the original direction. Arrow A) occurs. Due to this stress, the stress also acts on the nozzle plate 27 bonded to the fixed plate 70, and this stress causes the nozzle plate 27 to peel off from the recording head main body 20 and to peel off from the fixed plate 70.

However, in the present embodiment, as shown in FIG. 5B, when the recording head 10 warps in the longitudinal direction at a high temperature, the fixing plate 70 fixed to the recording head body 20 also follows. Although it is curved in the longitudinal direction, the first slit 72 and the second slit 73 are formed, so that the first slit 72 and the second slit 73 are formed on the side opposite to the curved direction of the fixed plate 70 at the end in the longitudinal direction of the fixed plate 70. The stress (arrow B in the figure) is smaller than that in FIG. Therefore, in this embodiment, peeling of the nozzle plate 27 due to the stress generated between the substrates can be suppressed.

Although it is conceivable to provide openings for relieving stress in the flow path forming substrate 21 and the nozzle plate 27 in this way, there is no room for providing slits in these substrates, and the flow path forming substrate. 21 and the rigidity of the nozzle plate 27 itself may be reduced, and the durability may be lowered. Therefore, the first slit 72 and the second slit 73 may be provided on the fixing plate 70 as in the present embodiment. preferable.

As described above, in the present embodiment, by providing the first slit 72 and the second slit 73, it is possible to reduce the stress caused by the warp in the longitudinal direction of the recording head 10 and to suppress the peeling of the nozzle plate 27.

Further, in this case, since the second slit 73 is provided on the outer peripheral side of the fixed plate 70 with respect to the second region 74b to which the mold member is applied, the second slit 73 is temporarily provided as shown in FIG. Even if the mold member 52 protrudes from the slit 73 to the ink ejection surface side, the second
Since the slit 73 and the first slit 72 are not continuous, the mold member 52 does not flow out to the exposed portion opening 71. As a result, the mold member 52 does not reach the nozzle opening 26 and does not hinder ejection. In addition, since the mold member 52 is exposed from the second slit 73 in this way, the molding by the mold member 52 is reliably performed over a wide range, and the mold member in the inner peripheral side region of the second region 74b. It can be visually confirmed from the ejection surface side of the recording head 10 that the bonding by 52 is more reliably performed. Further, when the second slit 73 is embedded in the mold member 52 in this manner, the recording medium (paper surface) on the ejection surface side of the recording head 10 can be prevented from being caught by the second slit 73.

The formation positions of the first slit 72 and the second slit 73 will be further described with reference to FIG.

As shown in FIG. 7, in the top view of the recording head 10, the first slit 72 and the second slit 73 are a predetermined position in the longitudinal direction of the fixed plate 70, that is, an extending portion 47 a in which the ink introduction port 48 is formed. Is provided at a position where is formed.

As described above, the vicinity of the extended portion 47 a provided for forming the ink inlet 48 has a high rigidity in the longitudinal direction of the recording head body 20 because the width of the opening 47 is narrow. In this way, the fixing plate 70 is overlapped with the region R having a high rigidity in the longitudinal direction of the recording head body 20, that is, the region R extending in the width direction of the recording head body 20 in accordance with the width of the extending portion 47 a. First
By providing the slit 72 and the second slit 73, the rigidity in the longitudinal direction of the entire recording head 10 can be made uniform. That is, the fixing plate 70 is provided with the first slit 72 and the second slit 73 to reduce the rigidity in the longitudinal direction in the region R in the top view, but the rigidity of the recording head main body 20 is the region R in the region R in the top view. The rigidity in the longitudinal direction is increased. Therefore, the rigidity of the entire recording head 10 including the recording head body 20 and the fixed plate 70 is uniform in the longitudinal direction.

As described above, when the first slit 72 and the second slit 73 opposed to each other in the width direction of the recording head main body 20 are provided in the region R where the extending portion 47a is formed in the top view, there is a possibility that the rigidity may be lowered. Rather, by providing the first slit 72 and the second slit 73 to equalize the rigidity, the concentration of stress is also suppressed.

As shown in FIG. 8, a plurality of head units 1 having such a recording head 10 are fixed to a fixing member (four in this embodiment as an example), and an ink jet recording which is an example of a liquid ejecting head module. The head module 200 is configured. Such a head module 200 is mounted on an ink jet recording apparatus which is an example of a liquid ejecting apparatus. Here, the ink jet recording apparatus of this embodiment will be described. FIG. 8 is a schematic perspective view illustrating an ink jet recording apparatus that is an example of the liquid ejecting apparatus according to the first embodiment of the invention.

As shown in FIG. 8, the ink jet recording apparatus of this embodiment includes a head module 20.
Printing is performed by transporting a recording sheet S such as paper that is a medium to be ejected with 0 fixed.
This is a so-called line type recording apparatus.

Specifically, the ink jet recording apparatus I includes an apparatus main body 2, a head module 200 fixed to the apparatus main body 2, a conveying unit 3 that conveys a recording sheet S that is a recording medium, and a head of the recording sheet S. The module 200 includes a platen 4 that supports the back side opposite to the printing surface facing the module 200.

The head module 200 is fixed to the apparatus main body 2 such that the first direction, which is the juxtaposed direction of the nozzle openings 26 of the recording head main body 20, is a direction that intersects the conveyance direction of the recording sheet S.

The transport unit 3 includes a first transport unit 5 and a second transport unit 6 provided on both sides of the recording direction of the recording sheet S with respect to the head module 200.

The first transport means 5 includes a drive roller 5a, a driven roller 5b, and a transport belt 5c wound around the drive roller 5a and the driven roller 5b. Second
Similarly to the first transport unit 5, the transport unit 6 includes a driving roller 6a, a driven roller 6b, and a transport belt 6c.

The driving rollers 5a and 6a of the first conveying means 5 and the second conveying means 6 respectively.
A driving means such as a driving motor (not shown) is connected to the recording medium S, and the conveying belts 5c and 6c are driven to rotate by the driving force of the driving means, whereby the recording sheet S is moved to the head module 200.
It is conveyed on the upstream and downstream sides.

In the present embodiment, the first conveying unit 5 and the second conveying unit 6 including the driving rollers 5a and 6a, the driven rollers 5b and 6b, and the conveying belts 5c and 6c are exemplified. You may further provide the holding means hold | maintained on the conveyance belts 5c and 6c. As the holding unit, for example, a charging unit that charges the outer peripheral surface of the recording sheet S may be provided, and the recording sheet S charged by the charging unit may be attracted onto the conveying belts 5c and 6c by the action of dielectric polarization. . Further, as a holding unit, a pressing roller may be provided on the conveying belts 5c and 6c, and the recording sheet S may be sandwiched between the pressing roller and the conveying belts 5c and 6c.

The platen 4 includes a head module 20 between the first transport unit 5 and the second transport unit 6.
The cross section provided opposite to 0 is made of a metal or resin having a rectangular shape. The platen 4 supports the recording sheet S conveyed by the first conveying unit 5 and the second conveying unit 6 at a position facing the head module 200.

The platen 4 may be provided with a suction unit that sucks the conveyed recording sheet S on the platen 4. Examples of the suction means include a device that sucks and sucks the recording sheet S and a device that electrostatically sucks the recording sheet S by electrostatic force.

Although not shown, the head module 200 is connected to ink storage means such as an ink tank or ink cartridge in which ink is stored so as to be able to supply ink.
For example, even if the ink storage unit is held on the head module 200, the ink supply needle 61 of each head unit 1 is held at a position different from the head module 200 in the apparatus main body 2 via a tube or the like. It may be connected to. Further, external wiring (not shown) is connected to each head unit 1 of the head module 200.

In such an ink jet recording apparatus I, the recording sheet S is transported by the transport unit 5, and printing is performed on the recording sheet S supported on the platen 4 by the head module 200. The printed recording sheet S is conveyed by the conveying means 3.

(Other embodiments)
As mentioned above, although embodiment of this invention was described, the basic composition of this invention is not limited to what was mentioned above.

In the embodiment described above, the first slit 72 and the second slit 73 are provided as the slits, but the present invention is not limited to this. For example, only the first slit 72 and the second slit 7
Only 3 is acceptable. Moreover, you may provide a slit so that it may become asymmetrical.

In the embodiment, the region R in the width direction of the extending portion 47 a is a region having high rigidity in the longitudinal direction of the recording head body 20, so that the first slit 72 and the second slit 73 are accommodated in this region R. Although provided, it is not limited to this. As shown in FIG. 9, even if the first slit 72 and the second slit 73 are provided so as to overlap at least in this region R, the stress in the longitudinal direction of each recording head 10 is reduced, and each The rigidity distribution in the longitudinal direction of the recording head 10 can be made substantially uniform. Further, as shown in the present embodiment, the shape of the first slit 72 and the shape of the second slit 73 may be different.

In the present embodiment, the ink introduction path 50 and the ink introduction port 48 are the recording head body 20.
The extended portion 47a is also provided so as to be positioned at the central portion of the recording head body 20, but is not limited thereto. For example, as shown in FIG.
When the recording head body 20 is provided on the end side in the longitudinal direction of the head case 49 in the top view, respectively, the extended portion 47b is formed in accordance with this forming position. The fixing plate 70 is provided on each end side in the longitudinal direction. In the embodiment shown in FIG. 10, the exposed portion opening 71 is smaller than that in the present embodiment.

Therefore, in the case shown in FIG. 10, the first slit 72A and the second slit 73A are provided so as to face the formation positions of the extending portions 47b. Thus, by providing the plurality of first slits 72A and the second slits 73A in the longitudinal direction of the fixed plate 70, the stress in the longitudinal direction of the fixed plate 70 is further reduced, and the stiffness distribution in the longitudinal direction of each recording head 10 is reduced. Can be made substantially uniform.

In the present embodiment, one fixing plate 70 is provided for each recording head main body 20, but the present invention is not limited to this. A plurality of recording head main bodies 20 may be fixed to one fixed plate 70, and a plurality of exposed portion openings 71 corresponding to each recording head main body 20 may be provided on the fixed plate 70. Even in this case, the first slit 72 and the second slit 73 may be formed so as to suppress stress due to warpage in the longitudinal direction of each recording head main body 20. That is, each exposed portion opening 71 is provided with a pair of first slits 72 at least at a part of the peripheral edge of the exposed portion opening 71, and the second slit 73 is a mold member application region of each recording head body 20. What is necessary is just to be provided in at least one part outside 74b so that the exposed part opening 71 may become discontinuous.

Moreover, although the shape of the 1st slit 72 and the 2nd slit 73 was each rectangular shape in this embodiment, it is not limited to this. The corners of the first slit 72 and the second slit 73 may be R-shaped. By making the corners into an R shape without making the corners acute, the wiping means can be prevented from being caught during wiping to wipe the surface of the fixed plate 70.

In the present embodiment, the so-called off-carrier type ink jet recording apparatus in which the ink cartridge is not mounted on the head module is exemplified, but the present invention is not limited to this. For example,
A so-called on-carrier type ink jet recording apparatus in which an ink cartridge is mounted on a head module may be used.

Further, for example, in the above-described embodiment, a thin film type piezoelectric element is exemplified as the pressure generating element, but the configuration of the pressure generating element is not particularly limited, and is formed by, for example, a method of attaching a green sheet or the like. It may be a thick film type piezoelectric element or a longitudinal vibration type piezoelectric element in which piezoelectric materials and electrode forming materials are alternately stacked to expand and contract in the axial direction. In addition, as a pressure generating element, a heating element is arranged in the pressure generating chamber, and droplets are ejected from the nozzle by bubbles generated by the heat generated by the heating element, or static electricity is generated between the diaphragm and the electrode. A so-called electrostatic actuator that ejects liquid droplets from the nozzle by deforming the diaphragm by electrostatic force can be used.

In the above-described embodiment, the ink jet recording head has been described as an example of the liquid ejecting head. However, the present invention is intended for all liquid ejecting head modules that widely include the liquid ejecting head. Various recording heads used in image recording apparatuses such as, color material ejection heads used in the manufacture of color filters such as liquid crystal displays,
The present invention can also be applied to a liquid ejecting head module having an electrode material ejecting head used for electrode formation such as an organic EL display and FED (field emission display), a bio-organic matter ejecting head used for biochip production, and the like.

I ink jet recording apparatus, 1 head unit, 10 ink jet recording head, 20 recording head main body, 21 flow path forming substrate, 22 pressure generating chamber, 2
6 Nozzle opening, 27 Nozzle plate, 30 Piezoelectric element, 39 Manifold part, 40 Manifold, 41 Through hole, 44 Sealing film, 45 Reinforcement plate, 46
Compliance board, 47 opening, 47a, 47b extending portion, 48 ink introduction port, 49 head case, 50 ink introduction path, 60 holding member, 70 fixing plate, 71 exposed portion opening, 72, 72A first slit, 73, 73A Second slit, 74a Adhesive application area, 74b Mold member application area

Claims (6)

A nozzle plate in which nozzle openings for ejecting liquid are formed;
A head body including a flow path forming substrate provided with a pressure generating chamber communicating with the nozzle opening, and pressure generating means for applying pressure to the pressure generating chamber and ejecting liquid from the nozzle opening;
A fixing plate to which the head body is fixed,
The fixing plate is provided with an exposed portion opening from which the nozzle opening is exposed, and a through hole formed in at least a part of the periphery of the exposed portion opening,
The liquid ejecting head according to claim 1, wherein the through hole reduces stress acting on the fixed plate due to a difference in linear expansion coefficient of a laminated substrate including the flow path forming substrate, the nozzle plate, and the fixed plate.   The liquid ejecting head according to claim 1, wherein the through hole is a first through hole provided in a central portion in a longitudinal direction of a peripheral edge portion of the exposed portion opening.   The second through-hole is provided on the outer peripheral side of the exposed portion opening and at a central portion in the longitudinal direction of the peripheral portion of the exposed portion opening so as to be discontinuous with the exposed portion opening. The liquid ejecting head according to claim 1, wherein the liquid ejecting head is a liquid ejecting head. The head body is
A liquid reservoir that communicates with the pressure generation chamber via a liquid flow path and stores the liquid;
A sealing plate for sealing the liquid reservoir,
In the sealing plate, a recess provided along the longitudinal direction of the sealing plate;
Extending from the edge of the recess toward the recess, and provided with an extension portion in which a liquid inlet for introducing liquid into the liquid storage portion is formed,
The said through-hole is formed in the said fixed plate so that at least one part may oppose this extended part in the transversal direction of the said head main body in top view. The liquid jet head according to any one of the above.   A liquid ejecting head unit comprising a plurality of the liquid ejecting heads according to claim 1.   A liquid ejecting apparatus comprising the liquid ejecting head according to claim 1.