JP2001277515A - Liquid ejection head and method for manufacturing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the orifice plate of a liquid ejection head from stripping. SOLUTION: A top plate is placed on a heater board which is placed on a base plate 4 and fixed with a chip tank 11 thus constituting a head body 15 including a plurality of liquid channels and ejection heaters arranged in respective liquid channels. Rear side of the face 6b of an orifice plate 6 arranged with a plurality of ejection openings 6a is bonded to the front plate part 11b of the chip tank 11 located in front of the head body 15. The orifice plate 6 is bent at the edge part 11c of the front plate part 11b except the face 6b thereof and led to the upper and lower faces of the chip tank 11 where the orifice plate 6 rides over a protrusion lid before being secured by means of a retaining plate 12.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to a liquid ejecting head for performing recording by ejecting ink from ejection ports provided in an orifice plate and a method of manufacturing the same.

[0002]

2. Description of the Related Art A liquid jet recording apparatus supplies ink (liquid) to a liquid jet head, for example, and drives an energy generating means such as a piezo element or an electrothermal converter provided on the liquid jet head based on image data. By doing so, printing is performed using an ink dot pattern formed by ejecting ink and attaching it to a recording medium such as recording paper.
The liquid jet recording apparatus that performs recording by ejecting ink from the ejection ports of the liquid ejecting head in this manner has low noise,
It is known as an excellent recording apparatus in terms of high-speed recording and the like.

FIG. 15 is a perspective view showing a conventional liquid jet head in a state where a part thereof is broken and an orifice plate 106 is separated.

As shown in FIG. 15, in a conventional liquid ejecting head of this kind, an electrothermal transducer (ejection heater) 101 which is an energy generating means for ejecting ink.
a and wiring for supplying power to the discharge heater 101a,
A support board (base plate) in which a heater board 101 formed on a silicon substrate by a silicon film forming process is formed of aluminum, ceramics, or the like.
It is mounted on die 104 by die bonding.
The base plate 104 also functions as a heat sink that radiates and cools heat generated in the heater board 101 as the discharge heater 101a is driven.

[0005] On the heater board 101, a top plate 105 for forming a liquid flow path is provided. The top plate 105 is formed in a concave shape on the bottom surface of the top plate 105 and has an orifice plate 10.
No. 6 forming a liquid flow path communicating with the discharge port 106 a of No. 6 and a nozzle 1 formed in a concave shape on the bottom surface of the top plate 105.
07, a common liquid chamber 108 serving as a sub-tank for supplying ink, and an ink supply port 109 for supplying ink to the common liquid chamber 108.

Further, on the base plate 104, an ink passage 111a for guiding ink from an ink storage tank or a sub-tank (not shown) disposed at a position upstream of the liquid ejecting head with respect to the ink flow direction to the ink supply port 109. Is provided.

[0007] The chip tank 111 has a front plate portion 111b. Front plate part 111b
Are the same number of discharge ports 1 as the nozzles 107 at the same intervals.
The orifice plate 106 has a role of bonding and holding the orifice plate 106a in the outer peripheral area thereof, and the orifice plate 106 has a detachment force and a pressure holding force applied during a capping operation from a cap member (not shown) provided in the recording apparatus main body. It plays a role of supporting the orifice plate 106 so that it can withstand sufficiently.

The top plate 105 is made of a resin such as polysulfone, polyethersulfone, polypropylene, modified polyphenylene oxide, polyphenylene sulfide, liquid crystal polymer, or a material such as ceramics, silicon, nickel, or carbon.

The orifice plate 106 is made of SUS
(Stainless steel), metal plates made of Ni, Cr, Al, etc., resin molded products made of polyimide, polysulfone, polyethersulfone, polyphenylene oxide, polyphenylene sulfide, polypropylene, etc., resin film materials, etc., as well as silicon, ceramics, etc. Formed by

Next, an outline of an assembling process of a conventional liquid jet head will be described.

First, the heater board 101 mounted on the base plate 104 is adjusted so that the discharge heater 101a and the nozzle 107 facing the discharge heater 101a match with high precision.
The top plate 105 and the top plate 105 are aligned, and both are tightly fixed by a joining means such as an adhesive or a pressing means such as a pressing spring (not shown).

Next, the chip tank 111 is mounted on the base plate 104, and the ink supply port 10 of the top plate 105 is provided.
9 and the ink passage 111a of the chip tank 111 are connected. At this time, the front plate portion 111b of the chip tank 111 covers the outside of the heater board front surface 101b and the top plate front surface 105b constituting the liquid flow path end surface. In addition,
The liquid channel end faces 101b and 105b are connected to the front plate 11
It is configured to protrude from the surface of 1b by several tens μm to several hundred μm.

Next, as shown in FIG. 16, the orifice plate 106 is connected to the end face 1 of the liquid flow path projecting as described above.
01b and 105b are joined by joining means such as an adhesive. At this time, since the surface of the front plate portion 111b is recessed from the liquid flow end surfaces 101b and 105b, the front plate portion 111b does not hinder the joining between the orifice plate 106 and the liquid flow end surfaces 101b and 105b. .

In many cases, a step of several tens μm to several hundreds of μm is provided between the front plate portion 111b and the liquid flow end surfaces 101b and 105b, so that the back surface of the orifice plate 106 is formed. Since a gap is formed between the front plate 111b and the front plate 111b, an adhesive or a sealant is poured into the gap to cure the gap, thereby completing the joining of the orifice plate 106. Thereby, the assembling process of the liquid jet head is completed.

As another conventional liquid ejecting head,
As shown in FIG. 17, there is also a configuration in which an orifice cover 112 whose front surface is hollowed out so as to cover only four sides of the orifice plate 106 is added.

[0016]

Generally, in the case of a liquid jet head having a structure in which an orifice plate is joined to a liquid flow path (nozzle) opening surface of the liquid jet head, FIG.
When the ink ejection surface is cleaned by the wiping operation of the recovery device as shown in FIG. 8, the wiping blade 12 as shown as wiping operation b in FIG.
Since the end of the orifice plate 106 comes into contact with the orifice plate edge 106c so as to be dragged, the orifice plate 106 is easily peeled from the head body at the edge 106c. In addition, since the tip of the wiping blade 121 rubs on the face surface 106b of the orifice plate 106, the edge portion 1
There is a possibility that the orifice plate 106 may be peeled off other than 06c.

The edge 106 of the orifice plate 106
If c is peeled off even slightly, the peeling of the orifice plate 106 further proceeds by repetition of the wiping operation thereafter, and irreparable damage is caused to the liquid ejecting head.

In order to avoid such a problem, FIG.
As shown in FIG. 2, there is a configuration in which an orifice cover 112 is provided so as to cover four sides of the orifice plate 106.
However, in this configuration, the area that the capping means for suction recovery contacts is relatively small. Therefore, in order to improve the accuracy of the capping operation, it is necessary to use a high-precision component for the capping means. In the configuration in which the orifice cover 112 is added, if an area where the capping means is brought into contact is to be increased, the size of the head component becomes relatively large. Therefore, any of these causes a cost increase and an increase in an occupied area due to an increase in the size of the entire recording apparatus.

Further, in the configuration in which the orifice cover 112 is added, a step is generated between the orifice cover 112 and the orifice plate 106, and the orifice plate 1
When the residual liquid on 06 is wiped off by the blade 121, the liquid may accumulate at the corners of the steps, or the blade 121 may vibrate or jump over, resulting in insufficient contact and uneven wiping. Further, the orifice cover 112
Blade orifice plate 106
Can not properly follow, for example, contact in a one-sided state,
Since the blade 121 may be damaged, this configuration has a problem in reliability.

Further, in a configuration in which the orifice cover 112 is not used, the wiping blade 121 is prevented from being caught on the edge 106 c of the orifice plate 106.
A method is considered in which the movable range of the wiping blade 121 is narrowed to restrict the rubbing area between the wiping blade 121 and the face surface 106b of the orifice plate 106. However, in the case of such a method, first, it is necessary to adopt a configuration in which the wiping blade 121 advances and retreats with respect to the face surface 106b of the orifice plate 106, so that the wiping device becomes expensive. Second, there is a problem that dust (dust, paper dust, paper fuzz, etc.) and thickened ink (ink in which volatile components are evaporated) collected by the wiping blade 121 by the wiping operation return to the face surface 106b again. . That is, dust and thickened ink collected and adhered to the sliding surface of the wiping blade 121 by wiping are removed by the wiping blade 12.
Face 1 of orifice plate 106
06b and transferred back to the orifice plate 1
06 may be rubbed against the face 106b.

As described above, the method using the orifice cover 112 and the method of restricting the rubbing range between the wiping blade 121 and the face surface 106b of the orifice plate 106 are not very advantageous.

Therefore, the present invention can prevent the orifice plate from being peeled off by the wiping operation without using a method using an orifice cover or a method for restricting the range in which the wiping blade and the orifice plate face rub against each other. It is an object of the present invention to provide a liquid jet head that can be manufactured and a method for manufacturing the same.

[0023]

The liquid ejecting head of the present invention is characterized in that an orifice plate in which a plurality of ejection openings for ejecting liquid are arranged, and a plurality of liquid flow passages communicating with each ejection opening. A head body that is provided in each liquid flow path and includes an energy generating unit that generates energy for ejecting the liquid, and a part of the orifice plate is fixed to a front surface of the head body, The other part is fixed in a state of being bent along the wall surface of the head body, and a projection is provided on the wall surface of the head body where the bent part of the orifice plate contacts, and the bent part of the orifice plate is on the projection It is in the state where it got on.

According to this configuration, the bent portion of the orifice plate can be stably held, the flatness of the face surface of the orifice plate is high, and the edge of the orifice plate does not exist on the face surface. And it becomes difficult to peel off. Furthermore, the protrusions are only partially provided, but do not increase the thickness of the entire head.

If the pressing plate for pressing the bent portion of the orifice plate is provided behind the projection on the wall surface of the head body where the bent portion of the orifice plate contacts, the orifice plate can be more securely fixed. . Further, the bending of the orifice plate can be suppressed at the corner portion of the holding plate, and the orifice plate can be securely fixed with a stronger force in addition to the frictional force of the contact surface between the holding plate and the orifice plate. Also,
The force can be selectively determined by appropriately setting the clearance between the projection and the holding plate.

The head body includes an element substrate provided with energy generating means, a top plate laminated on the element substrate,
A chip tank attached to the stack of the element substrate and the top plate, the front surface of the head body is the front plate portion of the chip tank, and the wall surface of the head body is the side surface of the chip tank. It is.

[0027]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a perspective view of a liquid jet head according to a first embodiment of the present invention, and FIG. 2 is a perspective view of a state in which a pressing plate is omitted, an orifice plate is separated, and a part is cut away. 3, FIG. 3 is a further exploded perspective view, FIG. 4 is a sectional view of the liquid ejecting head, and FIG. 5 is an enlarged view of a main part of FIG.

The head body of the liquid jet head according to the present embodiment has substantially the same configuration as the above-described conventional example except for the protrusion 11d. That is, as shown in FIG. 2, a heater board (element substrate) 1 in which an electrothermal transducer (discharge heater) 1a as an energy generating means and wiring are formed on a silicon substrate is placed on a base plate 4. Is die bonded. The base plate 4 functions as a heat sink for radiating and cooling the heat of the heater board 1.
The heater board 1 has a top plate 5 having a nozzle 7 forming a liquid flow path, a common liquid chamber 8 as a sub tank, and an ink supply port 9.
Are joined. The top plate 5 is formed of a resin such as polysulfone, polyethersulfone, polypropylene, modified polyphenylene oxide, polyphenylene sulfide, or a liquid crystal polymer, or a material such as ceramics, silicon, nickel, or carbon. Then, on the base plate 4, the top plate 5, and the heater board 1,
The head body 15 is configured by attaching the chip tank 11. In the chip tank 11, an ink passage 11a for guiding ink to the ink supply port 9 is formed. The chip tank 11 has a front plate 11.
b and a projection 11d.

An orifice plate 6 having a plurality of discharge ports 6a is fixed to the head main body 15, specifically, the front plate portion 11b. The discharge ports 6a of the orifice plate 6 are arranged at positions that can face the same number of nozzles 7 of the head body. The orifice plate 6 is S
Flexible films formed from metal plates such as US, Ni, Cr, Al, etc., resin molded products such as polyimide, polysulfone, polyether sulfone, polyphenylene oxide, polyphenylene sulfide, and polypropylene, and resin film materials -Shaped member.

A portion of the orifice plate 6 outside the discharge port 6a is joined to the front plate portion 11b, and the front plate portion 11b holds the orifice plate 6,
The orifice plate 6 supports the capping member (not shown) provided in the recording apparatus main body so that the orifice plate 6 can sufficiently withstand a detaching force and a pressing and holding force applied during a capping operation. The orifice plate 6 has a larger area than the front plate portion 11b of the chip tank 11,
The chip tank 11 is bent at the edge 11c. At this time, the bent portion 6d of the orifice plate 6
Is in a state of getting over the protrusion 11d. Further, the bent portion 6d is fixed behind the projection 11d by a pressing plate 12 (see FIG. 3).

Next, an outline of an assembling process of the liquid jet head of the present embodiment will be described.

First, the heater board 1 is connected to the base plate 4
Die bonding on top. Then, the heater board 1 and the top plate 5 are positioned with high accuracy so that the plurality of discharge heaters 1a and the corresponding nozzles 7 face each other. Thereafter, the heater board 1 and the top plate 5 are brought into close contact with each other by a bonding means such as an adhesive or a pressing means such as a pressing spring (not shown). Thus, a liquid flow path is formed on the joint surface between the heater board 1 and the top plate 5.

Next, the chip tank 11 is fixed to the base plate 4 so as to cover the top plate 5 and the heater board 1, and the ink supply port 9 of the top plate 5 is connected to the ink passage 11 a of the chip tank 11. Front plate 11b
Surrounds the outside of the end face (the front end face 1b of the heater board and the front end face 5b of the top plate) where the opening end of the liquid flow path is located. At this time, the end faces 1b and 5b are configured to protrude forward from the front surface of the front plate portion 11b by several tens μm to several hundred μm.

Then, the orifice plate 6 is connected to the heater board 1 and the top plate 5 by joining means such as an adhesive.
Are joined to the end faces 1b and 5b. As described above, since the front surface of the front plate portion 11b is recessed from the end surfaces 1b and 5b, the orifice plate 6 and the liquid flow path end surface 1b,
It does not hinder the joining of 5b.

Subsequently, the orifice plate 6 is bent at the edge 11c of the front plate portion 11b of the chip tank 11, and is adhered to the upper and lower surfaces of the chip tank 11 along the outer shape of the chip tank 11. At this time, since the tip tank 11 is provided with the protrusion 11d, the bent portion 6d of the orifice plate 6 is in a state of going over the protrusion 11d. Further, the bent portion 6d of the orifice plate 6 is fixed by fixing the holding plate 12 to the head main body 15 at a position behind the protrusion 11d. Thus, the orifice plate 6 is joined to the head main body 15. A step of several tens μm to several hundreds of μm is formed between the front plate portion 11b and the end surfaces 1b and 5b, and the orifice plate 6 does not tightly adhere along the step, and the orifice plate 6 There may be a slight gap on the back side of. In this case, an adhesive or a sealing agent is poured into the gap to seal the gap.

As described above, when the ink ejection surface of the liquid ejecting head is cleaned by performing the wiping operation by the recovery device as shown in FIG. 18, conventionally, the end of the wiping blade 121 in the state shown in FIG. Since the portions come into contact with each other so as to drag the edge 106c of the orifice plate 106, there is a problem that peeling is likely to occur.

Therefore, in this embodiment, the orifice plate 6 is bent at the edge 11c of the front plate 11b of the chip tank 11. By bending and fixing the orifice plate 6 at the edge 11c of the front plate portion 11b of the chip tank 11, the contact area (bonding area) of the orifice plate 6 with the chip tank 11 is increased, and the chip is more firmly fixed. In addition, even when a force is applied from the wiping blade during wiping, the wiping blade does not easily come off. In addition, since the orifice plate 3 is fixed to the three surfaces (front surface, upper surface, and lower surface) of the chip tank, the orifice plate 3 is fixed much more firmly than when the orifice plate 3 is fixed to only one surface. In addition, it is difficult to peel off against external forces applied from various directions as well as on the other hand.

When the wiping direction is perpendicular to the bending line of the orifice plate 6 (and the edge 11c of the front plate portion 11b), the face surface 6b to be wiped has the orifice plate 6
Since there is no edge portion of the wiping blade, there is no fear of peeling due to the force applied by the wiping blade. In some cases, the edge in the direction parallel to the relative movement direction of the wiping blade may be located near the edge of the front plate portion, but this does not cause peeling. further,
If the edge is located outside the moving area of the wiping blade, peeling can be more reliably prevented.

On the other hand, even when the wiping direction is a direction parallel to the bending line of the orifice plate 6 (and the edge 11c of the front plate portion 11b), since the orifice plate 6 is bent, the edge portion is bent. Even if the wiping blade comes into contact with the wiping blade and an external force is applied and the wiping blade is peeled off, there is no fear that the wiping blade will be peeled off unless a force that shears the orifice plate 6 at the bent portion is applied. Since it is unlikely that a force large enough to shear the orifice plate 6 is actually applied, the orifice plate 6 is hardly peeled off in this case as well.

As described above, regardless of the positional relationship between the wiping direction and the bending line of the orifice plate, the orifice plate 6 can be prevented from peeling during wiping by bending and holding the orifice plate 6. it can.

Further, the face surface 6b is not constituted by combining a plurality of member surfaces but is constituted only by the orifice plate 6, so that there is no step on the face surface 6b and flatness is secured. As a result, the durability of the wiping blade is improved, and the service life of the liquid jet recording apparatus can be extended. Furthermore, since there is no orifice cover or the like, even if the capping area is made as large as the area of the face surface 6b in order to increase the capping accuracy, the entire liquid ejecting head does not become large,
Contribute to downsizing.

Next, in the present embodiment, the chip tank 1
The technical meaning of the projection 11d provided on the first will be described.

First, the case where there is no projection will be described. The bending characteristics vary depending on the material of the orifice plate, its thickness and size, etc., and in some cases, the desired shape is obtained such that when bent, it bends at the ridge line along the edge of the front plate of the chip tank. I can't. Then, as shown in FIG. 6, the bent portion of the orifice plate 26 may have an arc shape with a large curvature. In this case, the front side (face surface 26a)
Side) and the face surface 26a
It is difficult to secure the flatness of the film. Therefore, the end of the front plate portion 27 where the bent portion of the orifice plate 26 bends is not a shape in which the front surface and the side surface intersect at right angles and a clear ridge line exists, but the end portion 27a is chamfered as shown in FIG. 8, or a configuration in which the rounded portion 27b is used as shown in FIG. However, if the angle of the chamfered portion 27a and the radius of curvature of the rounded portion 27b are not appropriate, the arcuate portion 26b of the orifice plate 26 does not match and the arcuate portion 26b is not stable, so that the front plate portion 27 is accurately machined. It is necessary and the process becomes complicated. In any case, in order to stabilize the arc-shaped portion 26b of the orifice plate 26, it is necessary to make the head body thicker,
This affects the space of the recording apparatus and the distance between heads when used in parallel. When a holding plate is used to fix the bent portion of the orifice plate 26, the holding plate must be thick in order to have sufficient rigidity for fixing, and further affects the space and the distance between heads. Would.

On the other hand, in the present embodiment, the head body 1
By forming the projection 11d on the step 5, a step is provided, and the arcuate portion 6c of the orifice plate 6 can be stabilized at the step, and the flatness is reduced by projecting to the front side (face side 6b side). Absent. Further, since the entire head main body 15 remains thin only by providing the projection 11d partially, it can be arranged so as not to affect the space and the distance between the heads. In particular, the holding plate 1
If 2 is disposed outside the protrusion 11d, the thickness of the head main body 15 will not increase so much even if a thick and rigid holding plate 12 is used. Also, the orifice plate 6
Since the bent portion becomes wider, the curvature can be reduced by dispersing the stress, which is effective for reducing the thickness of the head body.

Note that an adhesive or a sealing agent 1 having an adhesive force is provided on the step formed by forming the projection 11d.
6 is injected and the back surface of the orifice plate 6 and the front plate portion 11b are joined, bending stress is suppressed, and more reliable and highly reliable flatness of the face surface 6b can be obtained.

The height of the protrusion 11d depends on the material, bending rigidity, thickness, shape, etc. of the orifice plate 6 to be used, and the bonding in the gap (step portion) between the back surface of the orifice plate 6 and the front plate portion 11b as described above. It is selected based on the presence or absence of the agent or the sealing agent 16. In general, the higher the height of the protrusion 11d, the better the bending shape of the orifice plate 6, whereas if the height of the protrusion 11d is low, the orifice plate 6 does not contact the surface of the head body 15. The portion that tends to be unstable becomes smaller. Further, when the thickness of the holding plate 12 is set to be equal to or less than the height of the protrusion 11d,
The thickness of the holding plate 12 does not affect the thickness of the head body 15 at all. If the thickness of the holding plate 12 is
When the height is larger than the height d, the thickness of the holding plate 12 has no influence on the thickness of the head body by making the portion of the head body 15 to which the holding plate 12 is attached concave.

By reducing the thickness of the head main body 15 in this way, the size of each component is reduced, thereby reducing the cost. In addition, the miniaturization of the head main body 15 reduces the size of the entire liquid jet recording apparatus. And cost reduction. If the liquid ejecting head can be made smaller and thinner in this way, when liquid ejecting heads are arranged in parallel for multi-color printing, which is increasingly required in the future,
The arrangement pitch of the nozzles 7 (heads) for each color can be reduced, which is effective for appropriate color expression. Further, not only the holding plate 12 and the orifice plate 6 are in surface contact, but also the orifice plate 6 is pressed in the radial direction by the corner 16a of the holding plate 12, that is, as shown in FIG. With the structure in which the plate 6 is sandwiched, the orifice plate 6 can be more strongly and reliably fixed.

When a recovery operation is performed in the liquid jet recording operation, as shown in FIG. 9, the recovery cap 13 comes into contact with the face surface 6b of the orifice plate 6 to seal the space including the rows of nozzles 7. In this embodiment, since the face 6b of the orifice plate 6 is smooth and has no steps, the cap 13 is attached to the face 6b of the orifice plate.
Even if it contacts any part of b, the sealing property can be ensured. Therefore, the positional accuracy of the cap 13 and the operating accuracy of the cap driving means (not shown) can be reduced to some extent, and the recording apparatus can be simplified.

In the present embodiment, the orifice plate 6 and the chip tank 11 are joined to each other by bending the orifice plate 6 on the front surface and the upper and lower surfaces. Thus, in the wiping operation performed after capping or after continuous discharge, the orifice plate 6
The reaction force can be applied not only from the front plate portion 11b on the back side but also from the bending-side surface (upper surface and lower surface), and a larger reaction force can be obtained. Further, as described above, since the orifice plate 6 is bent, even if an external force is applied to the contact surface to separate it, there is a concern that the orifice plate will be separated unless there is enough force to shear the orifice plate at the bent portion or the like. There is no. Usually, since the breaking force of the orifice plate 6 in the shear direction is much larger than the pressing force of the wiping blade against the face surface 6b of the orifice plate 6, the orifice plate 6 is substantially not peeled off by the wiping blade. impossible.

The liquid jet head according to the second embodiment of the present invention shown in FIGS. 10 to 12 is different from the first embodiment only in the shape of the projection and the position of the pressing plate. Only the configuration of this portion will be described below, and description of the other configurations will be omitted.

In this embodiment, the distance between the projection 17a of the chip tank 17 and the holding plate 18 is widened, and the rear end of the projection 17a is rounded instead. Thus, the orifice plate 6 is smoothly located from the upper surface of the projection 17a to the lower surface of the holding plate 18. As in the first embodiment, the orifice plate 6 is
As in the configuration in which the orifice plate 6 is sandwiched between the holding plate 12 and the holding plate 12, high precision is not required for the work of arranging the holding plate 12, but the contact area of the orifice plate 6 with the tip ring 17 can be widened. 6 can secure the reliability of fixing.

In the third embodiment shown in FIG.
Front plate 1 of chip tank 11 of the first embodiment
Instead of 1b, a receiving plate 19 which is a dedicated member for receiving the orifice plate 6 is provided.

In the fourth embodiment shown in FIG.
The front plate 20a of the chip tank 20 and the front portion 21a of the base plate 21 constitute a surface for receiving the orifice plate 6.

In these second to fourth embodiments,
The same effects as in the first embodiment can be exhibited.

In each of the above embodiments, FIGS.
As shown in FIG. 2, the configuration in which the protrusions 11d and 17a are provided only on the upper surface side of the chip tanks 11 and 17 is described.
The same effect can be obtained even in a configuration in which similar projections are provided on the lower surface side (base plate side). It is also effective to provide a configuration in which projections are provided on both the upper surface side and the lower surface side.

In each embodiment, the projection may be provided integrally with the chip tank, or a separately formed projection member may be attached to the chip tank.

[0058]

As described above, according to the present invention,
By bonding the orifice plate to the head body and bending and fixing the orifice plate, the arc-shaped portion and the bent portion of the bent portion can be stably held, and the flatness of the face surface of the orifice plate is high. In addition, the end of the orifice plate can be prevented from being present on the face surface, so that the orifice plate is hardly peeled off.
Furthermore, the protrusions are only partially provided, but do not increase the thickness of the entire head.

[Brief description of the drawings]

FIG. 1 is a perspective view of a liquid jet head according to a first embodiment of the present invention.

FIG. 2 is a partially cutaway perspective view of the liquid ejecting head of FIG. 1;

FIG. 3 is an exploded perspective view of the liquid jet head of FIG.

FIG. 4 is a sectional view of the liquid jet head of FIG. 1;

FIG. 5 is an enlarged view of a main part of FIG. 4;

FIG. 6 is an enlarged sectional view of a main part of a liquid jet head according to a first reference example.

FIG. 7 is an enlarged sectional view of a main part of a liquid jet head according to a second reference example.

FIG. 8 is an enlarged sectional view of a main part of a liquid jet head according to a third reference example.

FIG. 9 is a schematic diagram showing a capping operation of the liquid jet head of FIG. 1;

FIG. 10 is a perspective view of a liquid jet head according to a second embodiment of the present invention.

FIG. 11 is a sectional view of the liquid jet head of FIG.

FIG. 12 is an enlarged view of a main part of FIG. 11;

FIG. 13 is a perspective view of a liquid jet head according to a third embodiment of the present invention.

FIG. 14 is a perspective view of a liquid jet head according to a fourth embodiment of the present invention.

FIG. 15 is a partially cutaway perspective view of a conventional liquid jet head.

FIG. 16 is a perspective view of the liquid jet head of FIG.

FIG. 17 is a perspective view of a modification of the conventional liquid jet head.

FIG. 18 is a schematic view illustrating a wiping operation of a liquid jet head of a conventional liquid jet head.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Heater board (element board) 1a Discharge heater (energy generating means) 1b End face 4 Base plate 5 Top plate 5b End face 6 Orifice plate 6a Discharge port 6b Face face 6c Arc-shaped portion 6d Bending portion 7 Nozzle 8 Common liquid chamber 9 Ink supply port DESCRIPTION OF SYMBOLS 11 Chip tank 11a Ink passage 11b Front plate part 11c Edge part 11d Projection 12 Press plate 13 Cap 15 Head body 16 Sealant 17 Chip tank 17a Projection 18 Press plate 19 Receiving plate 20 Chip tank 20a Front plate portion 21 Base plate 21a Front surface Department

Claims (8)

[Claims] 1. An orifice plate in which a plurality of discharge ports for discharging liquid are arranged, a plurality of liquid flow paths communicating with each of the discharge ports, and a plurality of liquid flow paths, respectively. A head body including energy generating means for generating energy for injecting the liquid, wherein a part of the orifice plate is fixed to a front surface of the head body, and the other part is a part of the head body. The orifice plate is fixed in a state of being bent along the wall surface, and a projection is provided on the wall surface of the head body where the bent portion of the orifice plate contacts, and the bent portion of the orifice plate rides on the projection. The liquid jet head is in a state. 2. A rear portion of the projection on the wall surface of the head body where the bent portion of the orifice plate contacts.
The liquid ejecting head according to claim 1, wherein a holding plate that holds the bent portion is provided. 3. The liquid jet head according to claim 2, wherein the bent portion is sandwiched between the protrusion and the pressing plate. 4. A chip in which the head body is mounted on an element substrate provided with the energy generating means, a top plate laminated on the element substrate, and a laminated body of the element substrate and the top plate. The liquid according to any one of claims 1 to 3, further comprising a tank, wherein a front surface of the head body is a front plate portion of the chip tank, and a wall surface of the head body is a side surface of the chip tank. Injection head. 5. A plurality of discharge paths are formed on a front surface of a head body including a plurality of liquid flow paths and energy generating means provided in each of the liquid flow paths and generating energy for ejecting liquid. Affixing an orifice plate in which outlets are arranged such that the liquid flow paths and the discharge ports face each other, and a portion of the orifice plate other than a portion fixed to a front surface of the head body. Bending the orifice plate along the wall surface of the head body, in the step of bending the orifice plate, bending the orifice plate in a state of riding on a projection provided on the wall surface of the head body. A method for manufacturing a liquid jet head. 6. The method for manufacturing a liquid jet head according to claim 5, further comprising a step of pressing the bent portion with a pressing plate behind the projection on the wall surface of the head main body. 7. The method according to claim 6, wherein, in the step of holding down the orifice plate, the bent portion is sandwiched between the projection and the holding plate. 8. A head body is further formed by laminating a top plate on an element substrate provided with the energy generating means, and attaching a chip tank to a laminate of the element substrate and the top plate. 8. The method according to claim 5, wherein a front surface of the head body is a front plate portion of the chip tank, and a wall surface of the head body is a side surface of the chip tank. .