JP2000006426A - Liquid jet recording head - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve general moldability, including molding accuracy and dimensional stability, of a top plate in which ink channels and ejection openings are formed. SOLUTION: A top plate 5 provided integrally with nozzles 7 communicating with ink ejection openings 6a, an orifice plate 6, ink liquid chambers and ink supply openings is bonded onto a heater board 1 arranged with ejection heaters 1a. The orifice plate 6 is divided into a lower part including the ink ejection openings 6a and an upper part including no ink ejection opening 6a. The top plate 5 is constituted of a first basic body comprising the nozzles 7 and the lower part of orifice plate 6, and a second basic body comprising other parts and they are integrated by bonding through two-color molding.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid jet recording head used in a liquid jet recording apparatus for performing recording by discharging ink from a discharge port of an orifice plate onto recording paper.

[0002]

2. Description of the Related Art A liquid jet recording apparatus performs recording on recording paper by discharging ink (recording liquid) as droplets from an ejection port provided in an orifice plate of a liquid jet recording head. The ink in the liquid flow path is heated by the ejection energy generating element provided in the liquid flow path based on the drive signal transmitted from the main body, thereby causing a state change in the ink and forming bubbles. Ink is ejected from the ejection port based on a volume change at the time of formation.

As the ejection energy generating element, specifically, an electrothermal converter which generates heat when energized in accordance with a recording signal is used. It is formed using.

A liquid jet recording head is generally composed of a substrate on which a plurality of ejection energy generating elements are arranged, and a top plate which covers the substrate. The top plate has an orifice plate having a liquid flow path (nozzle) and an ink discharge port facing each discharge energy generating element on the substrate, an ink liquid chamber for supplying ink to each liquid flow path, and an ink liquid chamber for the ink liquid chamber. And an ink supply port for supplying the ink.

The orifice plate has a size of several tens μm to several hundred μm.
m, in which a number of fine holes are formed as ink ejection ports. As a method for efficiently forming these fine holes with high precision, laser processing, electroforming, precision press processing, precision molding, and the like are used.

On the other hand, the liquid flow path (nozzle) has a width of several tens μm.
m, formed by grooves having a depth of several tens of μm, and a large number of these grooves are arranged at a pitch of several tens of μm. Injection molding, transfer molding, and so on such that such a fine groove is arranged with high precision facing the ejection energy generating element.
It is manufactured by compression molding, extrusion molding, casting, precision molding such as ceramic injection, fine laser processing such as excimer laser and YAG laser, anisotropic silicon etching, and semiconductor thin film forming technology such as photolithography.

The top plate is formed by precision processing as described above. Among them, the method of precision molding is very effective in that members can be manufactured at low cost and a complicated shape can be easily formed. Until now, various forms of top plates have been formed.

As the molding resin material, a resin material having excellent ink resistance such as polysulfone, polyethersulfone, polyphenylene sulfide, modified polyphenylene oxide, polypropylene, polyimide, and liquid crystal polymer (LCP) is generally used.

In top plate molding, filling the thin portion of the orifice plate and stably transferring the fine portion of the liquid flow path wall are the most difficult techniques. Therefore, high-precision top plate molding is performed by using various simulation techniques such as flow analysis and precision mold processing techniques, and using high-speed injection molding machines for precision and high-fluid resin materials. .

The orifice plate may be formed integrally with the top plate or may be formed separately from the top plate. Both top plate configurations are appropriately selected according to the overall component configuration, the configuration of the assembling apparatus, the laser processing method, and the like, but in any case, an advanced fine molding technique is required.

FIG. 13 is a schematic diagram of such a conventional liquid jet recording head. As shown in FIG. 13, the liquid jet recording head includes a substrate (hereinafter, referred to as a heater board) 100 provided with ink discharge pressure generating elements, and a recording liquid (hereinafter, referred to as ink) joined to the heater board 100. Liquid chamber 600 and liquid flow path (nozzle) 700 accommodating
And an ink supply port 1000 communicating with the ink liquid chamber 600 is disposed above the ink liquid chamber 600.

An orifice plate 400 having an ink discharge port for discharging ink is formed integrally with the top plate 500 in front of the liquid flow path (nozzle) 700, or is joined to the top plate 500. When engaged, the ink ejection port is in communication with the liquid flow path 700.

The heater board 100 is adhered and fixed to a support substrate (hereinafter, referred to as a base plate) 300 with an adhesive 306 or the like, and the top plate 500 is provided with a heater as an ink discharge pressure generating element provided on the heater board 100. Part 1
The orifice plate 400 is disposed on the front end face of the base plate 300 like a front droop so as to be aligned with the liquid flow path (nozzle) 700 of the top plate 500. The ink liquid chamber 600 of the top plate 500 is provided with an ink supply port 10 from an ink tank (not shown).
The ink is supplied via the “00”.

In such a liquid jet recording head, when the ink flow path is formed by joining the liquid flow path (nozzle) 700 and the heater board 100, the liquid flow path (nozzle)
When bonding between 700 and heater board 100 is performed with a bonding agent such as a sealant or an adhesive, these bonding agents enter liquid flow path (nozzle) 700 and change the shape of liquid flow path (nozzle) 700. Or part of the liquid flow path (nozzle) 700 may be blocked. Therefore, at least the liquid flow path wall portion is mechanically pressed to perform joining.

The configuration will be described below. The heater board 100 and the top plate 500 are positioned in the direction parallel to the ink ejection direction (the direction of arrow E) so that the front end face of the heater board 100 abuts against the orifice plate portion 400. The plate 500 is joined. Next, the claw 507 provided at the lower end of both ends of the holding spring 900 is connected to the hole 3 provided in the base plate 300.
07, and the bent portion 507 a of the claw 507 is locked to the lower surface of the base plate 300. Thereby, the pressing spring 900 can apply a mechanical pressure to the contact portion from above the liquid flow path wall of the top plate 500.

Therefore, the liquid flow path wall of the top plate 500 and the heater board 100 come into close contact with each other by the above-mentioned mechanical pressing.

However, in the case of such a mechanical pressing, the liquid flow path wall is directly loaded from above, so that the liquid flow path wall can be brought into close contact with the heater board 100. Since the pressing force does not sufficiently act on the joining portion, it is very difficult to bring all these portions into close contact with the heater board 100.

On the other hand, there is a method in which individual pressurizing means are provided to press the outer wall portion of the ink liquid chamber, and the outer wall portion of the ink liquid chamber is brought into close contact. When pressed, the repulsive force acts on the liquid flow path wall, which may hinder the adhesion of the liquid flow path wall, and is not a very effective method.

For this reason, a small step is generally provided between the lower surface of the liquid flow path wall and the lower surface of the outer wall of the ink liquid chamber.
When the lower surface of the liquid flow path wall is in close contact with the heater board 100, a gap is formed between the lower surface of the outer wall portion of the ink liquid chamber and the heater board 100. Then, a sealant is caused to flow in the gap to ensure airtightness between the outer wall of the ink liquid chamber and the heater board 100.

As a matter of course, if the value of this gap is large, it causes poor sealing. On the other hand, if this value is small, the lower surface of the ink liquid chamber outer wall and the heater board 100
Will be in contact with each other and hinder the close contact between the liquid flow path wall and the heater board 100.

Accordingly, in order to reliably flow the sealant into the gap formed between the lower surface of the ink liquid chamber outer wall and the heater board 100, the step between the lower surface of the liquid flow path wall and the lower surface of the ink liquid chamber outer wall has a desired value. The molding process is controlled so that the molding is performed.

The sealant is used in a portion other than the gap between the outer wall of the ink liquid chamber and the heater board 100.
All the joints between the members that come into contact with the ink are sealed to prevent the ink from leaking to the outside. Specifically, the back surface of the orifice plate 400 and the front end surface of the heater board 100, the back surface of the orifice plate 400 and the front end surface of the base plate 300, the joint portion between the top plate 500 and the heater board 100, and the like are given. The sealing of the part is performed by flowing the sealant within a predetermined range by the capillary force generated between the gap between the members and the sealant, and devising the member shape so that the sealant does not flow outside the range. ,
Sealing is performed by controlling the dimensions of parts, controlling the viscosity of the sealant, and the like.

FIG. 14 shows the top plate 500 and the heater board 10.
FIG. 3 is a cross-sectional view showing a bonding state of the liquid crystal panel 0, as shown in FIG. In order to improve the ink ejection accuracy, the processing of both parts and the positioning of both parts are performed with high precision so that each liquid flow path (nozzle) 700 and each heater 100a face with high accuracy.

Further, when the ink is ejected from the liquid ejecting recording head, if a part of the ink drips down and adheres to the vicinity of the ejection port, it may cause the ejection direction of the ink to shift, or the attached ink may be long. When left for a while to solidify,
This will cause clogging of the ink. For this reason, generally, the entire surface of the orifice plate or a part of the periphery of the ink discharge port is subjected to a water-repellent treatment to prevent ink from remaining around the ink discharge port. Such a water-repellent treatment is performed by spraying or applying to the surface of the top plate after forming the top plate, or by eutectoid plating.

[0025]

As described above, the top plate has a complicated shape having a fine portion and a thin portion in which the liquid flow path wall, the orifice plate, the ink liquid chamber, the ink supply port and the like are integrated. In order to form a top plate, dimensional accuracy, dimensional stability, transfer accuracy, molding accuracy such as small deformation, and reliable filling of fine parts and thin parts are required. Thorough management of molding conditions, material quality, and the like is essential, and these ensure a stable molded product.

On the other hand, a personal computer, a copying machine,
In the liquid jet recording apparatus as an output device such as a facsimile, in the future, it is required to obtain a resolution comparable to a silver halide film, with the size of the ejection port constituting the liquid jet recording head, The width of the liquid flow path, the size of the heater, and their pitch will be further miniaturized.

The part of the molded top plate that requires the highest accuracy is the flatness of the lower surface of the liquid flow path wall, but usually, the lower surface of the liquid flow path wall of the top plate is warped by several μm. ing. Therefore, the lower surface of the liquid flow path wall is brought into close contact with the heater board while correcting the warpage of the lower surface of the liquid flow path wall by pressing the upper part of the liquid flow path wall downward with a pressing spring. For this reason, internal stress and internal distortion are generated in the top plate that is in close contact with the heater board.

When the internal distortion of the top plate is increased, the ejection of ink is adversely affected. That is, when the lower surface of the liquid flow path wall is corrected and brought into close contact, the orifice plate follows and warps under the influence of distortion around the liquid flow path wall.

If the orifice plate is warped, the relative orientation and relative position of the plurality of arranged ejection ports may change, and the landing accuracy of the ink deteriorates, resulting in a decrease in print quality.

On the other hand, there is a method in which the top plate is formed of a material having a large elastic modulus to improve the rigidity of the top plate and reduce internal distortion at the time of close contact. However, when the rigidity of the top plate is increased. In addition, it is difficult to correct the warpage of the lower surface of the liquid flow path wall, and there is a possibility that poor adhesion to the heater board may occur. On the other hand, there is a method of increasing the pressing force of the presser spring so that the entire liquid flow path wall is corrected.However, when the pressing force is increased, the internal stress of the top plate increases and the internal strain is further increased. Become.

When the contact between the liquid flow path wall and the heater board is insufficient, among the plurality of liquid flow paths formed by joining the heater board and the liquid flow path wall, the adjacent liquid flow path walls are connected to each other. There will be a gap between the heater board. As a result, the ejection pressure generated on the heater board is dispersed to the adjacent liquid flow path, and the ejection of the ink becomes unstable when the print recording is performed, and the ink droplets are distorted. In addition, when a recording signal is applied, ink is not ejected from an ejection port to be ejected, and ink is ejected from an adjacent ejection port, which may cause print disorder, which may cause deterioration in image recording quality. .

From the above, in order to ensure the close contact between the lower surface of the liquid flow path wall and the heater board, it is necessary to form the top plate so that the warpage of the lower surface of the liquid flow path wall is as small as possible.

The conventional top plate is formed by using a material having a relatively low elastic modulus in consideration of the amount of warpage after forming, so that the warpage of the liquid flow path wall can be corrected smoothly. Considered. Incidentally, in the conventional case, the warpage amount of the lower surface of the liquid flow path wall is 5 μm for the arrangement direction length of 13 mm.
m.

However, even if the lower surface of the liquid flow path wall is corrected for warpage of about 5 μm and brought into close contact with the heater board, print quality is hardly affected. However, if the rigidity of the top plate is increased, the warpage of 5 μm becomes a large value, and it is difficult to bring the liquid flow path wall into close contact.

Further, in the development of a top plate having a high-density nozzle in the future, the warpage of the lower surface of the liquid flow path wall of about 5 μm, which has not been a problem in the conventional top plate, becomes an issue. That is,
Even if the amount of internal distortion of the top plate after the close contact has not been a problem at all in the past, the effect on the ink flow path will increase due to the high density of the liquid flow path, and the ink ejection property will be improved. May worsen.

Therefore, in order to develop a liquid jet recording apparatus capable of high quality image recording, it is necessary for the top plate to overcome the conventional problems. It is required that the flatness of the lower surface of the wall be good, that the rigidity be high, that the internal distortion after adhesion be small, and the like. For these realizations, further improvements in production technology are required.

On the other hand, as for the molding resin, selection of a material having high precision and excellent dimensional stability is an important factor that is indispensable for improving the level of precision thin wall molding technology. That is, there is a limit in improving the performance of the top plate in molding using a pure material that does not include a filler as in the related art. Therefore, it is necessary to improve the performance of the top plate by employing molding materials filled with various fillers.

However, molding the top plate from a resin filled with a filler or the like has the following problems.

The first problem is related to laser processing. If the orifice plate is molded of resin,
The fine holes provided therein are generally formed by ablation using an excimer laser. However, in the excimer laser processing, since the filler portion is not ablated, there is a possibility that the filler may remain in a protruding shape on the inner surface of the fine hole or the filler may drop off from the surface to form a concave portion, and the inner surface of the fine hole is smooth. , Causing ink ejection failure.

The second is a problem relating to mold production.
Since the liquid flow path wall of the top plate has a fine shape, a mold piece for transferring this portion is manufactured with extremely high processing accuracy. Also, since this mold piece cannot be easily machined with a general machine tool, using a special machine tool and special materials,
It is precision machined over a long time. For this reason, the mold piece for transferring the liquid flow path wall increases the manufacturing cost of the entire mold. Furthermore, in the molding process, this mold piece rubs against the molten resin at the time of injection, and slides with the molded product at the time of mold release. Therefore, when the top plate is molded from a material containing a filler or the like, the wear of the mold piece is accelerated. Therefore, the durability of the mold is reduced and the productivity of the top plate is reduced.

Third, there is a problem regarding the fluidity of the material. In the molding of the top plate, a material grade having good fluidity is selected in order to surely transfer a fine portion. However, generally, when a filler is contained in a resin, the fluidity tends to deteriorate, which is disadvantageous in transferring a thin portion or a fine portion.

The fourth problem is that the filler hinders the flow and transfer of the resin. The width of the liquid channel wall is from several μm to more than ten μ
m, which is a fine size, and the size of filler particles such as fibers and beads may be larger than the thickness of the liquid flow path wall. When the top plate is molded with resin containing filler, not only the filler is not transferred into the liquid flow path wall, but also the filler stagnates while being bridged to the entrance of the groove, and the molten resin flowing from behind The flow will be disrupted or disrupted. In addition, when molding with a resin containing filler, the filler may precipitate on the surface of the molded product, and the filler deposited on the surface may rub against the mold at the time of release from the mold and may be missing from the surface layer of the molded product. There is. Further, since the filler is not filled in the liquid flow path wall, the effect of improving the performance of the liquid flow path wall does not work effectively.

On the other hand, there is a method of forming a top plate by including a resin in the form of an ultrafine powder having a thickness of several μm to several nm smaller than the thickness of the liquid flow path wall in the resin. It is very difficult to uniformly disperse the filler in the base resin, and it is extremely difficult to supply a stable material.

In order to uniformly disperse such a fine powder filler in a base resin, a special dispersion technique and a surface treatment of the fine powder filler with a silane coupling agent or the like are required. Is very expensive.

As described above, when the top plate is molded from a resin whose physical properties are enhanced by filling with a filler, the molding accuracy is improved, but the laser processing is hindered, the quality of the molded product is reduced, and the mold durability is reduced. However, this method is not always effective because it involves an adverse effect such as an expensive molding material.

Therefore, it is difficult to improve the molding accuracy of the top plate, the flatness of the lower surface of the liquid flow path wall, the rigidity of the top plate, and the like by the conventional molding method. This has been a challenge in development.

Next, problems in the use environment and storage environment of the liquid jet recording head will be described.

When the temperature fluctuation of the environment in which the liquid jet recording head is used becomes large, individual components constituting the liquid jet recording head may expand or contract in volume, and there is a possibility that the head joints may shift in relative position. is there. Since the liquid flow path formed by the close contact between the top plate and the heater board has a very fine pitch of several tens of μm, an increase in the relative positional deviation between them adversely affects the ink ejection performance. .

Since the material of the member forming the heater board and the material of the member forming the top plate are different, both members have
A force acting to move the relative positions of both will act. In other words, the internal stress generated by thermal expansion due to temperature fluctuation causes the volume of the heater board and the top plate to change individually, so that the liquid flow path wall and the heater that are joined to face each other may cause relative displacement. And

On the other hand, the liquid flow path wall is mechanically pressed as described above, and the pressing force causes a frictional force to act between the liquid flow path wall and the heater board. Due to the mechanical strength of the wall itself, relative displacement between the liquid flow path wall and the heater board is prevented.

However, since the effect of the mechanical pressing force is reduced at the tip of the discharge port, the tip of the discharge port is extremely small with respect to the liquid flow path wall and the heater board, but causes relative displacement. There is a risk.

Further, for example, 1200 dp in one injection
When a nozzle has a high density, such as a liquid jet recording head having an ejection port capable of obtaining a resolution of i, the thickness of the liquid flow path wall becomes a very small dimension of several μm to several tens μm. Frictional force and mechanical strength are reduced, and the relative positional deviation tends to increase. As a result, there is a possibility that a relative displacement may occur not only at the tip of the discharge port but also between the liquid flow path wall and the heater board, and it is difficult to suppress such a relative displacement.

In order to suppress the relative displacement, there is a method of increasing the pressing force of the pressing spring to increase the frictional force of the liquid flow path wall contact surface, but the pressing force of the pressing spring is increased to increase the top plate. , The internal distortion of the top plate increases,
The print quality may be degraded. Further, in a high-temperature environment, the liquid flow path wall receives the thermal stress and the weight of the holding spring,
There is a possibility that plastic deformation such as buckling or bending may occur without being able to withstand these forces. Therefore, it is not very advantageous to increase the pressing force of the pressing spring.

As another measure, a method of forming a top plate using a resin having a small coefficient of linear expansion can be considered.

For example, a resin such as polysulfone, polyethersulfone, modified polyphenylene oxide, polyphenylene sulfide, polypropylene, polyimide, polyamide imide, epoxy, polyethylene, LCP or the like, which has excellent ink resistance (chemical resistance), fibers or beads. For example, there is a method of molding a resin material having a low linear expansion coefficient by adding a filler such as LCP or a pure material using a resin material such as LCP having a low linear expansion coefficient comparable to metal.

When the top plate is molded from a resin material reinforced by filling with a filler, as described above, it is effective in lowering the coefficient of linear expansion of the molded product, but the deterioration in fluidity and the mold Of laser durability, laser workability,
It is not an effective means because of the adverse effects such as high material costs.

Therefore, a method of forming a top plate with a resin having a small coefficient of linear expansion such as LCP will be described.

LCP is a resin having a good molding fluidity even in a pure material grade, while having a small coefficient of linear expansion comparable to metal.

On the other hand, when the molten resin joins in the mold, the polymer is not easily entangled, so that the weld strength is as low as about 1/2 to 1/4 of that of a general polymer. It is a resin material having a disadvantage that the expansion coefficient has a large anisotropy.

When the top plate is formed by LCP, it is necessary to pay close attention to the gate position and control the weld formation position in order to prevent the mechanical performance and product performance of the part from being impaired by the weld portion. is important. In some cases, the product shape must be changed in order to control the weld formation position.

If the gate position control, product shape change, etc., do not provide sufficient welding measures, the transfer of the resin to a predetermined place is forcibly controlled by the work of the mold, or the orientation of the resin is controlled. It is necessary to perform operations such as controlling the position where the weld is formed, pushing the weld out of the product, and the like.

As a specific example, a resin reservoir is provided outside the molded product in the vicinity of the weld forming portion, and the mold piece is configured to advance and retreat through the resin reservoir. In other words, the mold piece entering the resin reservoir is retracted from the resin reservoir at a predetermined timing during the filling of the molten resin, so that the weld and the surrounding resin are poured into the resin reservoir and driven out. It is. The mold pieces moving into and out of the resin reservoir are transported and controlled by independent driving means. In addition, the resin expelled from the resin pool is cut and removed at the time of release or after release similarly to the gate portion.

As described above, since the weld line is partially removed from the molded product, a decrease in the mechanical strength of the molded product can be suppressed.

As described above, the method of controlling the transfer of the mold pieces by providing the resin reservoir in the mold is effective in controlling the anisotropy and orientation of the resin in addition to the weld formation control. Therefore, the present invention can be applied to improvement of molding accuracy, control of linear expansion coefficient, and the like.

As described above, as the resolution of the liquid jet recording apparatus increases in the future, the resin material applicable to the top plate is considerably limited. Further, even with an adaptable material, molding control is very difficult, and it is difficult to further improve molding accuracy. In addition, in order to control the orientation of the resin and control the weld as described above, the mold structure becomes complicated, and the molding machine becomes special. There is a problem of becoming quite advanced.

Therefore, in order to achieve the high resolution technology in the future liquid jet recording apparatus, the present invention covers all the moldability, such as the structure of the top plate, the molding accuracy of the top plate, and the dimensional stability of the top plate. It is an object of the present invention to further reduce the warpage of the lower surface of the liquid flow path wall and to overcome weaknesses in performance, such as thermal expansion and rigidity, which have been problems with the conventional top plate. It is another object of the present invention to provide a liquid jet recording head having high-density nozzles and capable of obtaining high image quality at low cost to the market.

[0067]

In order to solve the above-mentioned problems, the present invention is characterized in that a liquid jet recording head is constructed as follows.

(1) A substrate member provided with ejection energy generating elements for applying ejection energy to ink corresponding to a plurality of ink flow paths, a plurality of grooves corresponding to the plurality of ink flow paths, An orifice plate provided with a discharge port that communicates with one end of each of the grooves, and an ink liquid chamber that communicates with each of the grooves at the other end of each of the grooves to supply ink to each of the grooves. An ink supply port for supplying ink to the ink liquid chamber; and a top plate member and the substrate member, wherein the groove, the orifice plate, the ink liquid chamber, and the ink supply port are integrally formed. In the liquid jet recording head in which a plurality of ink ejection paths are formed by joining the orifices, the orifice plate has an orifice having the ejection port with a boundary above the ejection port. Divided into a lower part of the fiss plate and an upper part of the orifice plate not including the discharge port, the top plate member includes a first base body including the groove and the lower part of the orifice plate, the upper part of the orifice plate, the ink liquid chamber, and The first substrate and the second substrate are integrally formed by joining the two substrates by two-color molding.

(2) A substrate member provided with ejection energy generating elements for applying ejection energy to ink corresponding to a plurality of ink flow paths, a plurality of grooves corresponding to the plurality of ink flow paths, An orifice plate provided with a discharge port that communicates with one end of each of the grooves, and an ink liquid chamber that communicates with each of the grooves at the other end of each of the grooves to supply ink to each of the grooves. An ink supply port for supplying ink to the ink liquid chamber; and a top plate member and the substrate member, wherein the groove, the orifice plate, the ink liquid chamber, and the ink supply port are integrally formed. In the liquid jet recording head in which a plurality of ink ejection paths are formed by joining the orifices, the orifice plate has an orifice having the ejection port with a boundary above the ejection port. The top plate member is divided into a lower part of the fiss plate and an upper part of the orifice plate not including the discharge port, and the top plate member is a part of the groove, the lower part of the orifice plate, and a part of the outer wall of the ink liquid chamber which is in close contact with the substrate member. A first base consisting of, the orifice plate upper part, a portion of the ink liquid chamber excluding the first base,
And a second base comprising the ink supply port, and the first base and the second base are joined and formed integrally by two-color molding.

(3) A substrate member provided with ejection energy generating elements for applying ejection energy to ink corresponding to the plurality of ink flow paths, a plurality of grooves corresponding to the plurality of ink flow paths, An orifice plate provided with a discharge port that communicates with one end of each of the grooves, and an ink liquid chamber that communicates with each of the grooves at the other end of each of the grooves to supply ink to each of the grooves. An ink supply port for supplying ink to the ink liquid chamber; and a top plate member and the substrate member, wherein the groove, the orifice plate, the ink liquid chamber, and the ink supply port are integrally formed. In the liquid jet recording head in which a plurality of ink ejection paths are formed by joining the ink droplets, the ink liquid chamber is divided into a plurality of parts by a partition wall formed integrally with the top plate member. The orifice plate is divided into a lower portion of the orifice plate having the discharge port and an upper portion of the orifice plate not including the discharge port, with the upper side of the discharge port as a boundary, and the top plate member includes the groove,
A first base including a lower portion of the orifice plate, a portion of the outer wall of the ink liquid chamber in close contact with the substrate member, and a portion of the partition wall in close contact with the substrate member; an upper portion of the orifice plate; A portion of the liquid chamber excluding the first base, a portion of the partition wall excluding the first base, and a second base including the ink supply port, and the first base and the second base; Are joined and formed integrally by two-color molding.

(4) In the liquid jet recording head according to any one of (1) to (3), the first base is formed of a transparent member. (5) In the liquid jet recording head according to any one of (1) to (4), the first substrate is formed of polysulfone. (6) In the liquid jet recording head according to any one of (1) to (5), the first base is formed of a pure material containing no filler. (7) In the liquid jet recording head according to any one of (1) to (6), the second base is formed of a composite material filled with a filler. (8) In the liquid jet recording head according to any one of (1) to (7), the base resin of the material forming the second base is the same as the base resin of the material forming the first base. (9) In the liquid jet recording head according to any one of (1) to (8), the second substrate is formed by metal injection. (10) In the liquid jet recording head according to any one of the above items (1) to (9), the second base is formed of a material having a smaller linear expansion coefficient than a material forming the first base. (11) In the liquid jet recording head according to any one of the above items (1) to (10), the second base is formed of a material having a smaller molding shrinkage than the material forming the first base. (12) In the liquid jet recording head according to any one of (1) to (11), the second substrate is formed of a material having a higher elastic modulus than the material forming the first substrate.

(13) In the liquid jet recording head according to any one of (1) to (12), a part of a boundary surface between the first base and the second base has a concave / convex array including a plurality of concave portions and a plurality of convex portions. Is formed, the convex portion of the first base enters the concave portion of the second base,
And the convex part of the second base has entered the concave part of the first base. (14) In the liquid jet recording head according to the item (13),
The concave portions and the convex portions of the concavo-convex row are arranged alternately and at equal intervals. (15) In the liquid jet recording head according to (13) or (14), the concave / convex rows are arranged in the same direction as the arrangement direction of the grooves provided on the top plate.

(16) A substrate member provided with ejection energy generating elements for applying ejection energy to ink corresponding to a plurality of ink flow paths, a plurality of grooves corresponding to the plurality of ink flow paths, An orifice plate provided with a discharge port that communicates with one end of each of the grooves, and an ink liquid chamber that communicates with each of the grooves at the other end of each of the grooves to supply ink to each of the grooves. An ink supply port for supplying ink to the ink liquid chamber; and a top plate member and the substrate member, wherein the groove, the orifice plate, the ink liquid chamber, and the ink supply port are integrally formed. In the liquid ejection recording head in which a plurality of ink ejection paths are formed by joining the orifices, the orifice plate has the ejection port with the upper side of the ejection port as a boundary. The orifice plate is divided into a lower portion of the orifice plate and an upper portion of the orifice plate that does not include the discharge port, and the top plate member includes an ink contact portion base including a portion that is in contact with ink and a non-ink contact portion base including a portion that does not contact the ink. And the ink contact portion base and the non-ink contact portion base are joined and integrally formed by multicolor molding.

(17) In the liquid jet recording head of (16), the ink contact portion base is constituted by the groove, the lower portion of the orifice plate, the inner wall of the ink liquid chamber, and the inner wall of the ink supply port. Is constituted by the upper part of the orifice plate and the outer periphery of the top plate member. (18) In the liquid jet recording head according to (16) or (17), the ink contact portion base includes an ink discharge portion base including a groove and a lower portion of an orifice plate, an inner wall of an ink liquid chamber, and an inner wall of an ink supply port. The ink supply unit is formed by being divided into two substrates, that is, an ink supply unit substrate.

(19) In the liquid jet recording head according to any one of the above (16) to (18), the ink contact portion base is formed of a transparent member. (20) In the liquid jet recording head according to any one of (16) to (19), the ink contact portion base is formed of polysulfone. (21) In the liquid jet recording head according to any one of (16) to (20), the material constituting the ink contact portion base is a pure material containing no filler. (22) In the liquid jet recording head according to any one of the above (16) to (21), the material constituting the non-ink contact portion base is a composite material filled with a filler. (23) In the liquid jet recording head according to any one of (16) to (22), the base resin of the material forming the non-ink contact portion base is the same as the base resin of the ink contact portion base. (24) In the liquid jet recording head according to any one of (16) to (23), the non-ink contact portion base is formed by metal injection. (25) In the liquid jet recording head according to any one of (16) to (24), the material forming the non-ink contact portion base has a smaller linear expansion coefficient than the material forming the ink contact portion base. (26) In the liquid jet recording head according to any one of (16) to (25), the material forming the non-ink contact portion base has a smaller molding shrinkage than the material forming the ink contact portion base. (27) In the liquid jet recording head according to any one of (16) to (26), the material forming the non-ink contact portion base has a higher elastic modulus than the material forming the ink contact portion base.

According to the present invention, a top plate member having a complicated shape is divided and formed, and these are integrated by multicolor molding. In particular, since the thin portion of the orifice plate and the fine portion of the ink flow path wall are individually divided from the top plate body to have a simple shape, this portion can be formed with high precision. In other words, the part where high precision is required simplifies the shape, and the simple shape part and other parts are
If integrated by multicolor molding, the completed top plate member will be a highly accurate molded product. In addition, by forming various colors by combining various resins, ceramics, metals, fillers, and the like, it becomes possible to form a high-precision and multifunctional top plate member that cannot be realized by one-color molding.

The orifice plate and the ink flow path wall are the most important parts in the top plate member, and the following is important for the molding surface. That is, in the orifice plate, high-precision flatness and dimensional stability are required so that a discharge port having a desired shape and a desired length can be formed. Therefore, high-precision transfer and minute warpage are required so that stable ink ejection can be performed. Further, when the discharge ports and the ink flow path walls are formed by laser processing, the laser workability of the molding resin is also very important.

On the other hand, in terms of performance, high rigidity and a low coefficient of linear expansion are required. In order to satisfy such performance requirements, it is necessary to improve the top plate molding resin, and a composite resin containing a filler or the like is effective. However, when molded with a filler-containing material, the above-mentioned performance is satisfactory, but the filler impairs the above-mentioned conditions of the molded surface, so that a filler-filled material could not be used until now.

Therefore, the top plate member is divided into a first base including the lower part of the orifice plate including the discharge port and the ink flow path wall, and a second base including the upper part of the orifice plate, the ink liquid chamber and the ink supply port. If it is configured to be integrated by two-color molding, the conditions of the orifice plate (ejection port) and the molding surface in the ink flow path wall portion are satisfied by molding the first base with a conventional material. . On the other hand, if the second base is formed of a material for the purpose of improving the performance of the top plate member, if the two are integrated by two-color molding, the top plate member is not realized in the past. High performance will be provided.

An extremely thin portion such as an orifice plate has a very high flow resistance of the resin, and if such a thin portion extends over a wide range, it becomes extremely difficult to fill the resin. For this reason, low viscosity, high fluidity, and the like are required for the resin, and the selected resin is limited. On the other hand, strict control of various molding conditions such as mold temperature control, resin temperature control, injection pressure / injection speed control, and mold adjustment is required.

Then, when the orifice plate is divided into an upper part and a lower part, and the lower part of the orifice plate is formed in two steps such as forming the first base and the upper part of the orifice plate is formed in two steps, The area of the thin portion in one molding step is reduced, so that the moldability is significantly improved and the molding accuracy is further improved as compared with the case where the entire orifice plate is molded at one time.

In particular, since the first substrate has fine ink flow path walls and a thin orifice plate,
When the orifice plate is divided and the upper part of the orifice plate is removed, the area of the thin part becomes smaller,
The difficulty of molding the first substrate is considerably reduced.

Further, since the first substrate has a simple and uniform thickness, it is possible to improve the transferability, the molding accuracy, the planar accuracy of the lower surface of the ink flow path wall, and the like. Then, when the two are joined by multicolor molding, the completed top plate member can be improved in performance, such as elastic modulus and linear expansion coefficient, which are conventional drawbacks.

A first base member comprising a lower portion of an orifice plate including a discharge port, an ink flow path wall, and a portion of an outer wall of an ink liquid chamber which is in close contact with a substrate member (heater board); If it is configured to be divided into an upper portion, an ink liquid chamber portion other than the first substrate, and a second substrate including an ink supply port and integrated by two-color molding, the lower surface portion of the ink liquid chamber outer wall and the groove portion Are formed in the same process, so that even if the top plate member is formed by multi-color molding, the step between the lower surface of the ink liquid chamber and the lower surface of the ink flow path wall is formed with high precision. That is, since the piece for transferring the lower surface of the ink liquid chamber and the lower surface of the ink flow path wall are provided in the same mold, it is easy to secure the step accuracy between the two even in the manufacture of the mold.

Further, in a liquid jet recording head provided with a plurality of ink liquid chambers and capable of discharging various types of ink, the lower surface of the partition wall, the lower surface of the outer wall of the ink liquid chamber, and the groove are formed in the same process. In the same manner, it is also formed with high accuracy at the steps between the lower surface of the partition wall, the lower surface of the ink liquid chamber, and the lower surface of the ink flow path wall.

By the way, in order for the characteristics of the material used for the second base to be effectively exhibited for the improvement of the performance of the discharge port and the ink flow path wall of the first base, the first base is required. The shapes of both the first and second substrates and the shape of the joint are important. That is, the second substrate has a shape that covers the periphery of the ink flow path portion, the first substrate is as thin as possible, the second substrate has a large volume ratio to the first substrate, and the like. If the second substrate is molded with a molding material that improves the performance of the first substrate after the structural aspect is dealt with, the weak points of the first substrate can be more effectively compensated.

As described above, it is difficult to form a top plate member that satisfies the functions of both the forming surface and the performance surface required by the discharge port and the ink flow path wall by the one-color molding. If the member is subjected to composite molding by multi-color molding using a plurality of materials, it becomes possible to satisfy both opposing functions of the molding surface and the performance surface.

Therefore, the first substrate is molded with high precision using a pure resin having good fluidity and transferability, and the second substrate is filled with a filler having a high elastic modulus and a low coefficient of linear expansion. Molding using a resin (or metal or ceramics) filled with the like, if both are integrated by two-color molding, it is possible to complete a multifunctional top plate member that could not be obtained conventionally. it can.

Although the shape of the second base is complicated, the second base is formed of a material containing a filler or the like, so that molding conditions such as molding shrinkage and anisotropy are improved and high-precision molding is performed. It becomes possible. Therefore, the molded article in which the second base and the first base are integrated by multi-color molding becomes a top plate member having high precision, high rigidity, and heat resistant expansion property, which has not been realized conventionally, and has a performance surface. It will be dramatically improved.

When a resin containing a filler or the like is used for the second base, if the base resin and the pure material used for the first base are the same material, two-color molding is used. In this case, the bonding between the two becomes smooth and strong, and the second substrate structurally assists the first substrate, effectively improving the performance of the first substrate, which was a weak point, such as thermal expansion and elastic modulus. Can be.

[0091] By forming an uneven array of ribs, bellows, bosses, seats, rectangles, and the like at the joint interface between the first base and the second base, the bonding area between the first base and the second base is increased. In addition, it is possible to further strengthen the joining between them.

[0092] Further, when a row of irregularities is formed on the joint surface between the first base and the second base and a resin having a small linear expansion coefficient is used for the second base, the top plate can be used in an environment where the temperature changes greatly. Even if the first base is to be put into a change in volume, the second base is structurally prevented by the irregularities on the boundary surface, so that the change in the volume of the first base can be suppressed.

Further, if the irregular shape at the boundary portion is formed so that both are undercut in the peeling direction, the first base and the second base can be formed of different materials,
Even when the bonding strength is low, both can be integrated, and the second base can compensate for the weak point of the first base.

Further, if the pitch of the concave and convex rows is arranged in the same direction as the arrangement direction of the ink flow path walls, the relative position of the ink path from the discharge port to the ink flow path and the discharge energy generating element (heater) is reduced. The displacement can be reduced.

Also, if the top plate member is divided into an ink contact portion base consisting of a portion that comes into contact with ink and a non-ink contact portion base consisting of a portion that does not come into contact with the ink, if the multi-color molding is performed, Since the substrate does not require ink resistance (chemical resistance), various molding materials and fillers can be selected, and inexpensive base resins, high-precision base resins, base resins with excellent mechanical strength, etc. To
Molding can be performed by incorporating various fillers.

Also, an ink discharge portion base comprising an orifice plate lower portion and an ink flow channel wall, an ink supply portion base comprising an ink liquid chamber inner wall and an ink supply port inner wall portion, and an orifice plate upper portion and a top plate outer peripheral portion. In the case of a top plate configuration in which the outer peripheral substrate made of is integrated by three-color molding, the ink supply unit substrate is made of a material convenient for fine molding, the ink supply unit substrate is made of a material having good ink resistance, and the outer peripheral substrate is made. Each substrate can be formed of an optimal material, such as an inexpensive material, and the performance, cost, and workability of the top plate can be optimized.

Further, the surface layer of the orifice plate is separated from the main body of the orifice plate, and the surface layer of the orifice plate is formed of a material having good water repellency, and this water repellent surface layer is formed by two-color molding or multicolor molding. If it is configured to be integrated with the top plate and integrated, conventionally, the water repellent treatment of the orifice plate surface, which was performed in the secondary process, can be performed at the time of two-color molding or multi-color molding, The manufacturing process of the top plate member can be simplified.

In the case of multi-color molding, for example, in two-color molding, generally, the core portion of the mold is processed so as to have the same shape at two locations, while the two portions of the cavity portion of the mold are processed. Is subjected to processing according to the primary-side molding shape and processing according to the secondary-side molding shape. If the groove (nozzle) portion is to be transferred on the core side, two sets of expensive groove transfer mold pieces are required, and the production cost of the mold increases. Therefore, the mold can be manufactured at low cost by adopting a mold structure in which the groove portion is transferred on the cavity side. The same can be said for multicolor molding in which the third or higher order material injection is performed.

[0099]

(Embodiment 1) A liquid jet recording head according to Embodiment 1 of the present invention will be described with reference to FIGS.

FIG. 1 is an external perspective view showing an example of a chip configuration of a liquid jet recording head according to Embodiment 1 of the present invention.
FIG. 3 is an exploded perspective view of the liquid jet recording head shown in FIG. 1, FIG. 3 is a perspective view of the top plate shown in FIG.
5 is a perspective view of the top plate shown in FIG.
FIG. 2 is a sectional view of the top plate shown in FIG. 1.

First, the configuration of the liquid jet recording head will be described.

The heater board 1 is an electrothermal converter (discharge heater) which is an energy generator for discharging ink.
1a and wiring for supplying electric power to the discharge heater 1a are formed on a silicon substrate by a silicon film forming process. The wiring provided on the heater board 1 is electrically connected to the wiring board 2 by, for example, wire bonding,
The wiring board 2 makes electrical contact between the heater board 1 and the main body of the inkjet recording apparatus.
As the wiring substrate 2, a PWB substrate in which a wiring pattern is formed on a glass epoxy substrate with copper or nickel, a TAB film in which a wiring pattern is formed on a flexible film, or the like is used.

The heater board 1 and the wiring board 2 are mounted on a support substrate (hereinafter, referred to as a base plate) 3 formed of aluminum or the like. The heater board 1 is die-bonded on the base plate 3, and the wiring board 2 is bonded on the base plate 3 with an adhesive or the like. The base plate 3 also functions as a heat sink for radiating and cooling the heat of the heater board 1 generated by driving the discharge heater 1a.

On the area of the base plate 3 including the heater board 1, a top plate 5 forming an ink flow path is joined. The top plate 5 includes an orifice plate 6 in which a desired number of ink ejection ports 6a for ejecting ink to a recording medium are formed, and ink ejection ports 6a on the lower surface of the top plate 5.
The nozzle 7 is formed with a concave groove corresponding to the ink discharge port 6a and is formed as a sub-tank that is formed in a concave shape on the lower surface of the top plate 5 and supplies ink to the nozzle 7. It comprises an ink liquid chamber 8 and an ink supply port 9 for supplying ink from an ink storage tank (not shown) to the ink liquid chamber 8. The top plate 5
Are integrally formed by two-color molding as described later.

The thickness of the orifice plate 6 is several tens μm.
To several hundred μm. However, when the thickness becomes large, when forming the ink ejection port 6a by laser processing,
In general, it is formed with a very thin thickness of 30 μm to 80 μm because it consumes processing time and lowers processing accuracy.

The nozzle 7 has a very small thickness of several μm to several tens μm and a depth of several tens μm to several hundred μm at the tip of the groove wall which is the contact surface with the heater board 1. It is formed with dimensions.

The top plate 5 is provided on the heater board 1 with the holding spring 1.
It is adhered by 0. After the alignment of the presser spring 10 is adjusted so that the relative positions of the discharge heater 1a and the nozzle 7 completely match, the receiving portion 5a above the nozzle 7 is adjusted.
From the top. That is, the claws 10 a provided at the lower ends of both ends of the holding spring 10 are inserted into the holes 3 a provided in the base plate 3, and are engaged with the lower surface of the base plate 3. As a result, the holding spring 10 is connected to the receiving portion 5 a of the top plate 5.
To apply a mechanical pressure to the contact portion of the nozzle lower surface 7a. The wall of the nozzle 7 is completely adhered to the heater board 1 by the pressing of the pressing spring 10,
As a result, the nozzles 7 are completely partitioned.

Further, since the orifice plate 6 is disposed on the front end face 1b of the heater board 1 so as to hang forward, a direction parallel to the ink ejection direction between the heater board 1 and the top plate 5 (arrow in FIG. 2). Positioning in the E direction) is performed by positioning the front end face 1b of the heater board 1 on the rear face 6b of the orifice plate 6.
It is done so that it hits.

As described above, since the heater board 1 and the top plate 5 are pressed by the pressing spring 10, the nozzles 7 are completely separated from each other, but the orifice plate 6 and the front end face 1b of the heater board 1 are separated from each other. Since the pressing force of the pressing spring 10 does not sufficiently act on the boundary surface of, the adhesion becomes insufficient.

Further, since a step is provided between the lower surface 8c of the outer wall of the ink liquid chamber and the lower surface 7a of the nozzle, the nozzle 7
When the heater board 1 is in close contact with the ink liquid chamber outer wall lower surface 8
A gap of several μm to tens of μm is formed between c and the heater board 1.

In order to prevent the ink from leaking from such insufficiently adhered portions and gaps, a sealing agent such as silicone is injected into the entire bonding interface between the heater board 1 and the top plate 5. Filling the gap. Specifically, the back surface 6b of the orifice plate 6 and the front end surface 1 of the heater board 1
b, a gap between the back surface 6b of the orifice plate 6 and the front end face 3b of the base plate 3, a joint portion between the top plate 5 and the heater board 1 or the base plate 3, and the like. The sealing is performed by a capillarity generated between a gap between each member and the sealant, and the sealant is caused to flow within a predetermined range, and the member shape is devised or sealed so as not to flow outside the range. Sealing is performed by controlling the viscosity of the agent.

However, the back surface 6b of the orifice plate 6
The gap between the heater and the front end face 1b of the heater board 1 is very small, and is the most difficult part to inject the sealant. It is visually confirmed that the sealant is filled in a desired range. There is a need. If the orifice plate 6 is transparent, the filling of the sealant can be confirmed from the front surface of the orifice plate 6, so that the orifice plate 6 is preferably transparent.

Next, the structure of the top plate 5 formed by two-color molding will be described with reference to FIGS. As shown in the figure, the orifice plate 6 is separated from the lower surface 6c of the orifice plate by a boundary surface 6e located near and above the nozzle 7.
And an orifice plate upper portion 6d.

The top plate 5 comprises a first base 21 comprising an orifice plate lower part 6c and a nozzle 7, an orifice plate upper part 6d, an ink liquid chamber 8, an ink supply port 9,
It comprises a receiving portion 5 a and a second base 22 comprising an outer peripheral portion of the top plate 5. The first base 21 and the second base 22 are joined and formed by two-color molding. That is, the upper and lower portions of the orifice plate 6 that is divided and molded are integrated as the top plate 5 by two-color molding.

The first base 21 is composed of a thin portion of the lower portion 6c of the orifice plate and a fine portion of the nozzle 7, and is a portion of the top plate 5 where the highest molding accuracy is required and the difficulty of molding is extremely high. For example, it is molded by a high-speed injection molding machine using a material having good fluidity and suitable for fine molding, such as polysulfone, polyethersulfone, or the like. This material is transparent and has excellent laser workability. The formation of the orifice plate 6 and the ink ejection port 6a
And also have the necessary conditions for processing and forming. Furthermore, since it is a pure material that does not contain a filler, unlike a material containing a filler, the degree of wear of the mold can be reduced, and the durability of an expensive nozzle transfer mold piece deteriorates. Never.

Since the first base member 21 is formed of a pure and transparent material (polysulfone, polyethersulfone, or the like) as described above, the first base member 21 is sealed after the step of adhering the top plate 5 and the heater board 1 to each other. In the stopping step, it is possible to easily observe the sealing condition at each sealing portion.

As described above, the first base 21 is composed of the orifice plate lower part 6c and the nozzle 7, and since the shape thereof is simple, the molding accuracy can be improved.

That is, since the flatness of the nozzle lower surface 7a is improved as compared with the case where the top plate 5 is formed by one-color molding, internal distortion generated when the nozzle lower surface 7a is pressed against the heater board 1 is reduced.

The orifice plate 6, which is an extremely thin portion and is very difficult to fill with resin,
Since the orifice plate is formed in two steps, that is, the first base 21 and the second base 22, the orifice plate is formed in one step as compared with the conventional case where the orifice plate is formed in a single step. The area is reduced, the difficulty of filling the resin is reduced, the productivity is remarkably improved, and the molding accuracy is also improved.

Therefore, dividing the top plate 5 into the first base 21 and the second base 22 so as to be joined by two-color molding is to improve the molding accuracy of the top plate 5. It is a very effective means. Then, even if both are made of exactly the same material, if they are divided and formed by multi-color molding, the individual substrates are formed with high accuracy, and the forming accuracy of the completed top plate 5 is significantly improved. Furthermore, since both are joined at the time of molding, there is no need for a joining step by assembling, bonding or the like, so that the productivity is also excellent.

On the other hand, the second substrate 22 does not require the transferability accuracy and the dimensional accuracy unlike the first substrate 21. In addition, since the outer peripheral portion of the second base 22 plays the role of the housing of the top plate 5, the mechanical properties of this portion greatly affect the performance of the entire top plate. From these points, it is only necessary to select a molding material for the second base 22 with emphasis on physical properties.

Therefore, if the second base member 22 is formed of a resin containing a filler, the elastic modulus of the second base member 22 and the peripheral portion of the nozzle 7 increases, and accordingly, the rigidity of the entire top plate 5 increases. Will be improved.

Further, since the rigidity of the upper part 6d of the orifice plate is also improved, the warpage of the orifice plate 6 when the top plate 5 and the heater board 1 are brought into close contact can be reduced. That is, in the conventional configuration, when the warpage of the nozzle lower surface 7 a is corrected and the nozzle 7 is brought into close contact with the heater board 1, the orifice plate 6 warps following the nozzle 7 and the ink formed on the orifice plate 6 is formed. Although there is a possibility that the discharge port 6a may change the relative direction and the relative position, such a problem can be overcome by improving the rigidity of the orifice plate 6.

Therefore, by combining the improvement of the molding accuracy of the first base 21 and the improvement of the rigidity of the second base 22, the flatness of the nozzle lower surface 7a is improved, and the internal distortion of the top plate 5 and the orifice plate 6 is significantly reduced. It is reduced. on the other hand,
Since the ink ejection ports 6a are arranged with high precision, it is possible to manufacture a liquid ejection recording head that has excellent ink landing accuracy and can perform stable ink ejection.

Further, since there is no expensive mold piece in the manufacture of the mold for the second base 22, the durability of the mold may be slightly reduced, and the material used for the second base 22 may be filled. Various fillers can be selected.
Therefore, it is only necessary to select a material for the second base member 22 so as to optimize the elastic modulus, and thereby it is possible to optimize the rigidity of the top plate 5.

Further, magnesium alloy, SUS, iron,
If the second base member 22 is formed by metal injection using a material such as steel or ceramic injection using ceramics, the top plate 5 can obtain rigidity that cannot be obtained by resin molding.

As described above, the nozzle 7 is formed by molding,
Materials that can be used are limited due to sealing, laser processing, and the like, and there is a limit in reducing the linear expansion coefficient of the first base 21. Therefore, if the second base 22 is formed of a material that is resistant to thermal expansion, the second base 22 structurally compensates for the weak point of the thermal expansion of the first base 21 as in the case of the rigidity described above. Will be able to

As shown in FIG. 5, the orifice plate 6
Is provided near the upper portion of the ink passage extending from the nozzle 7 to the ink ejection port 6a. Therefore, when the second base 22 is formed of a low thermal expansion material, the ink passage is Even if thermal expansion is caused in the arrangement direction, the second base 22 acts to prevent the thermal expansion. Thus, the second substrate 22 of the low thermal expansion material
Is disposed near the upper portion of the entire area of the ink passage extending from the nozzle 7 to the ink discharge port 6a, so that the nozzle 7 and the ink discharge port 6a are individually deformed, The relative orientation does not change.

In order to reduce the linear expansion coefficient of the polymer material, the method containing a filler is the most effective. However, as described in the previous section, the adhesive strength between the first base 21 and the second base 22 is reduced. If not large, the second substrate 22 is
The effect of supplementing the thermal expansion of No. 1 is weakened.

When the molding resin of the second base 22 is made to contain a filler to reduce the coefficient of linear expansion of the second base 22, the bonding property between the base resin of the second base 22 and the resin of the first base 21 is reduced. Becomes important. It is preferable that the material of the base resin of the second base 22 and the material of the first base 21 have good bonding compatibility. For example, when the first base 21 is polysulfone, the second base 22 is based on polysulfone. When polysulfone is filled with a filler such as a carbon filler and a glass filler as a resin, the base resin of the two becomes the same, so that the bonding at the boundary surface becomes good during two-color molding. As a result, the second base 22 dramatically improves the thermal expansion of the first base 21.

Further, when the second base 22 is formed of a resin containing a filler, the effect of improving the forming accuracy of the second base 22 itself is also obtained. That is, when the filler is filled, the molding shrinkage of the resin is reduced by the filler, so that the molding accuracy of the second base 22 is inevitably improved. Therefore, the molding accuracy of both the first base 21 and the second base 22 is improved, and the top plate 5 completed by joining the two naturally becomes a high-precision molded product.

The above is an example of the top plate 5 adapted to the configuration of the first embodiment of the present invention. However, the present invention can be implemented on any top plate regardless of the form or shape of the top plate. The effect can be expected.

For example, in this embodiment, the ink supply port 9 is provided in a direction perpendicular to the ink discharge direction, but the ink supply port 9 is provided in the same direction as the ink discharge direction. Similar effects can be obtained even with a top plate structure.

The top plate 5 of the present embodiment has a configuration in which the orifice plate 6 is formed integrally with the top plate 5 after molding. Even if the liquid jet recording head has a structure in which the orifice plate 6 is completely separated and the orifice plate 6 is joined to the top plate 5 by means such as adhesion or engagement after the top plate 5 is formed, such a two-sided recording head may be used. Color shaping can be performed.

Further, the surface layer of the orifice plate 6 is separated from the main body of the orifice plate, and the surface layer of the orifice plate is formed using a material having good water repellency. By forming the top plate 5 by combining the orifice plate surface layers by three-color molding, the water-repellent treatment of the orifice plate surface, which was conventionally performed in the secondary process, is performed at the time of molding. Therefore, the manufacturing process of the top plate 5 can be simplified.

Further, the present invention is not limited to a top plate structure in which the nozzle 7 is formed by molding, and the nozzle 7 may be formed in a top plate structure formed by laser processing after forming the top plate. Applicable.

The means for increasing the rigidity of the top plate 5 is not limited to a method using a material having a large elastic modulus, but there is a method of increasing the rigidity structurally by devising the shape of the top plate. The rigidity of the top plate 5 may be increased by developing both the material and the structure.

In this embodiment, the orifice plate 6 is divided into two parts. However, it is needless to say that the orifice plate 6 may be divided into three or more parts.

The primary molding may be performed on either the first substrate 21 or the second substrate 22.

(Embodiment 2) FIG. 6 is a sectional view showing the structure of a top plate of a liquid jet recording head according to Embodiment 2 of the present invention. Hereinafter, a second embodiment of the present invention will be described by assigning the same reference numerals to the same portions as the first embodiment.

In this embodiment, the ink liquid chamber 8 is divided into a lower part 8a and an upper part 8b, and the lower part 8a of the ink liquid, the nozzle 7, and the lower part 6c of the orifice plate are used as the first base 21, and these parts are the same. By molding in the process,
The step between the lower surface 8c of the outer wall of the ink liquid chamber and the lower surface 7a of the nozzle is formed with high precision.

In FIG. 6, the first base 21 includes an orifice plate lower part 6c, the nozzle 7, and a lower part 8a of the ink liquid chamber 8, and the second base 22 includes an upper part 8b of the ink liquid chamber 8, It comprises a supply port 9, an orifice plate upper part 6d, a receiving part 5a, and an outer peripheral part of the top plate 5. The first base 21 and the second base 22 are joined and formed by two-color molding. That is, the lower portion 8a and the upper portion 8b of the ink liquid chamber 8, and the orifice plate lower portion 6c and the orifice plate upper portion 6d are integrated by the two-color molding.

Since the nozzle 7 and the lower portion 8a of the ink liquid chamber 8 are formed of the same base, the die for forming the nozzle 7 and the die for forming the lower portion 8a of the ink liquid chamber 8 are placed in the same cavity. Will be arranged. Therefore, as compared with the case where both are formed by individual processes, it is easier to secure the step accuracy between the lower surface 7a of the nozzle 7 and the lower surface 8c of the outer wall of the ink liquid chamber. It can be done easily and reliably.

Further, as described in the first embodiment, since the first base 21 is formed of a pure and transparent material (polysulfone, polyethersulfone, or the like), the first base 21 is in close contact with the top plate 5 and the heater board 1. In the sealing step performed after the step, it is possible to easily observe the sealing condition in each sealing portion.

In particular, since the state of sealing between the lower surface 8c of the outer wall of the ink chamber and the heater board 1 needs to be observed from the outer periphery of the top plate 5, it is visually observed that the lower surface of the outer wall of the ink chamber is not transparent. It is difficult. In the present embodiment, since the lower surface 8c of the ink liquid chamber outer wall is formed of a transparent material, it is possible to easily observe the sealing condition of the lower surface 8c of the ink liquid chamber outer wall.

Although the present embodiment has a top plate structure in which only one kind of ink can be handled, the top plate to which the present embodiment can be applied is not limited to such a configuration, and a plurality of ink liquid chambers are provided. The present invention is also applicable to a liquid jet recording head capable of ejecting various kinds of inks, and the same effect can be obtained.

That is, a partition wall for partitioning a plurality of ink liquid chambers is formed in a divided manner, and the first base is composed of an orifice plate lower portion, a nozzle lower surface, an ink liquid chamber outer wall lower surface, and a partition wall lower surface. The lower surface of the outdoor wall and the lower surface of the partition wall are formed in the same cavity.

(Embodiment 3) FIG. 7 is a perspective view of a top plate of a liquid jet recording head according to Embodiment 3 of the present invention, and FIG.
9 is an exploded perspective view of the top plate shown in FIG. 7 viewed from the front side of the orifice plate. FIG. 9 is an exploded perspective view of the top plate shown in FIG. 7 viewed from the back side of the orifice plate.

In the above embodiment, the second base member 22 is formed of a material having a small linear expansion coefficient to reduce the thermal expansion in the ink passage from the nozzle 7 to the ink discharge port 6a. In such a configuration, if the bonding force between the first base 21 and the second base 22 is small, the second base 22 may be used when the ink passage attempts to expand and contract in the arrangement direction.
Becomes weaker, and it becomes difficult for the second base member 22 to compensate for the weak point of thermal expansion in the ink passage. Therefore, in the present embodiment, even when the molding resin of the first base 21 and the molding resin of the second base 22 are difficult to fuse with each other,
It is intended to overcome the weak point of thermal expansion in the ink passage.

The third embodiment of the present invention will be described below with reference to FIGS.
Referring to FIG. 9, the same portions as those in the above-described embodiment are denoted by the same reference numerals and described.

7 to 9, the first base 21 is provided with a rib-shaped uneven row 31, and the second base 22 is provided with a rib-shaped uneven row 31 corresponding to the uneven row 31 provided on the first base 21. An uneven row 32 is provided. The uneven rows 31 and 32 are provided on the boundary surface 6e between the first base 21 and the second base 22 near the upper part of the ink passage extending from the nozzle 7 to the ink discharge port 6a. The passages are arranged in the same direction as the arrangement direction. The concave and convex rows 31, 32 are arranged such that the convex portions 31a of the first base 21 enter the concave portions 32b of the second base 22, and the convex portions 32a of the second base 22 enter the concave portions 31b of the first base 21. They are alternately arranged facing each other, and they are joined by two-color molding.

Therefore, if the second base member 22 is formed of a material having a small coefficient of linear expansion, even if the nozzle 7 and the ink discharge port 6a try to expand and contract in the arrangement direction due to a change in environmental temperature, the unevenness provided on both sides. Since the expansion and contraction of the nozzle 7 and the ink discharge port 6a are prevented by the rows 31 and 32, the restraining force by the second base 22 is significantly larger than that in the form without the uneven rows.

That is, even when the first base 21 and the second base 22 are hardly fused and the bonding strength is small, the uneven rows 31 and 32 are formed at the boundary 6e between them.
Thermal expansion in the arrangement direction of the nozzles 7 and the ink ejection ports 6a can be suppressed. Thereby, the combination of the molding materials of the first base 21 and the second base 22 can be selected from a wide range.

On the other hand, if a material is selected that is easy to fuse the first base 21 and the second base 22, the joining area between them becomes large and the bonding strength between them becomes large.
If the thermal expansion characteristic of No. 2 is good, the force for restraining the expansion and contraction of the nozzle 7 and the ink ejection port 6a in the arrangement direction is further increased.

Furthermore, the uneven rows 31 and 32 may be arranged at equal intervals or irregularly. However,
If the resin is arranged at regular intervals, the molding resin flows stably and regularly and is efficiently filled, so that it has an effect of suppressing the warpage of the molded product and can contribute to an increase in molding accuracy.

In this embodiment, the nozzle 7 and the ink discharge port 6
Although the rib-shaped uneven rows 31 and 32 are provided at the boundary 6e between the first base 21 and the second base 22 as the restraining means, the restraining means is not limited to the rib-shaped uneven rows.
The same effect can be obtained even with a corrugated array such as a bellows, a boss, a seat, and a rectangle.

In the direction in which the first base 21 and the second base 22 are separated (the direction of arrow G in FIG. 7), for example, FIG.
If the undercut-shaped concavo-convex rows 31 'and 32', such as the reverse tapered concavo-convex row shapes shown in FIG.

Further, the uneven rows are not limited to being arranged in the arrangement direction of the ink passages, but may be arranged in the ink ejection direction.

The restricting means is not limited to the concavo-convex array, but may be configured so that the second base 22 holds both side surfaces of the ink passage array. Further, a greater effect can be expected than when the arrangement of the concavo-convex rows and the holding of both side surfaces are used together.

In the present embodiment, the weak point of the thermal expansion in the ink passage has been described. However, the structure of the third embodiment is a method effective for the second base member 22 to improve the rigidity of the entire top plate. It is.

The boundary surface 6e between the orifice plate upper portion and the orifice plate lower portion does not need to be a straight line, but may be formed in an uneven shape, a wavy shape, or the like.

(Embodiment 4) FIG. 11 shows Embodiment 4 of the present invention.
1 is a schematic sectional view of a top plate of a liquid jet recording head according to the first embodiment.

In the above-described embodiment, the molding material of the second substrate had to be excellent in ink resistance. Generally, ink has a high alkali component and is made by mixing various chemicals. Therefore, a material having excellent chemical resistance is selected as a molding resin for the top plate. For this reason, a versatile and inexpensive base resin generally has inferior ink resistance, and it has not been possible to select a material obtained by mixing a versatile base resin with a filler.

Since the second substrate is larger in volume and consumes more material than the first substrate, if the base resin of the molding material for the second substrate is an inexpensive material, the molded product of the top plate can be used. It can be produced cheaply.

Therefore, in this embodiment, the top plate is divided into an ink contact portion substrate that comes into contact with ink and a non-ink contact portion substrate that does not come into contact with ink, and both substrates are joined by two-color molding. It is.

Hereinafter, a fourth embodiment of the present invention will be described with reference to FIG.
, The same parts as those in the above embodiment are denoted by the same reference numerals and described.

In FIG. 11, the top plate 5 comprises an orifice plate lower part 6c including an ink discharge port 6a, a nozzle 7, an ink liquid chamber 8, and an ink supply port 9, and is a part which is always in contact with ink. A non-ink contact base 42, which is a part that does not come into contact with ink, is composed of the base 41 and the upper part 6d of the orifice plate and the outer peripheral part of the top plate 5.

The ink contact portion base 41 and the non-ink contact portion base 42 are joined and integrally formed by two-color molding.

In this embodiment, since the non-ink contact portion 42 does not require ink resistance, this portion can be made of a low-cost base resin containing a filler and formed by two-color molding. The top plate to be manufactured can be manufactured at low cost.

Since the filler constituting the material forming the non-ink contact portion 42 contains the filler, as described in Embodiment 1, the molding shrinkage of the material is reduced by the filler. The accuracy is improved. In addition, by including the filler, the coefficient of linear expansion of the non-ink contact portion 42 is reduced, and the deformation of the ink passage due to environmental fluctuation is prevented, and the elastic modulus is increased. The rigidity is improved. In order to further improve the rigidity, the non-ink contact portion 42 may be formed by metal injection, ceramics injection, or the like.

The thickness of the inner wall of the ink liquid chamber 8 and the thickness of the inner wall of the ink supply port 9 can be arbitrarily set. Is formed so as to substantially match the thickness of the upper part of the ink contact portion base 41, the entire thickness of the ink contact portion base 41 becomes uniform, the molding material flows efficiently, and it is possible to finish the top plate with high molding accuracy. Become.

(Embodiment 5) FIG. 12 shows Embodiment 5 of the present invention.
1 is a schematic sectional view of a top plate of a liquid jet recording head according to the first embodiment.

In the fourth embodiment, since the ink contact portion substrate has the ink liquid chamber 8 and the ink supply port 9, when this portion is molded, a weld is formed in the molded product. Therefore, in forming the top plate 5 having the high-density nozzle,
This weld may deteriorate the filling property of the thin and fine portions of the ink contact portion base.

Therefore, in the present embodiment, the thin portion of the orifice plate lower portion 6c and the fine portion of the nozzle 7 are formed so as not to be welded, so that the molding accuracy can be improved and the inexpensive top plate 5 can be formed. Can be molded.

Hereinafter, a fifth embodiment of the present invention will be described with reference to FIG.
, The same parts as those in the above embodiment are denoted by the same reference numerals and described.

In FIG. 12, a top plate 5 includes an ink discharge portion base 51 including an orifice plate lower portion 6c and a nozzle 7, an ink supply portion base 52 including an ink liquid chamber 8 and an ink supply port 9, and an orifice plate upper portion 6d. And an outer peripheral base 53 forming the outer peripheral portion of the top plate 5. That is, the ink contact portion base 41 shown in FIG.
This is further divided into an ink discharge unit base 51 and an ink supply unit base 52. The ink discharge portion base 51, the ink supply portion base 52, and the outer peripheral portion base 53 are joined and formed by three-color molding.

By dividing the top plate 5 into three parts as described above, the ink discharge portion base 51 has a simple and uniform thickness, and has a shape that can prevent the occurrence of welds. It is possible to mold into. On the other hand, since the outer peripheral portion base 53 does not require ink resistance, a versatile and inexpensive material can be employed. Of course, the same material as the non-ink contact portion substrate described in the fourth embodiment can be used for the outer peripheral portion substrate 51.

As described above, if the ink discharge portion base 51, the ink supply portion base 52, and the outer peripheral portion base 53 are integrally formed by three-color molding, the top plate 5 having high-density nozzles can be formed with high precision and at low cost. It can be molded into

[0179]

As described above, according to the present invention,
The orifice plate formed integrally with the top plate member,
The lower part of the orifice plate is divided into the lower part of the orifice plate that does not include the discharge port and the upper part of the orifice plate that does not include the discharge port. And at least two bases including the upper part of the orifice plate, and by combining these bases by multi-color molding to form an integral body, various resins, metals, ceramics, fillers, etc. are combined. This makes it possible to form a high-precision, multifunctional top plate member that could not be realized by one-color molding. In addition, since an orifice plate having a small thickness is divided and formed in two steps of primary molding and secondary molding, the area of a thin portion is reduced in one molding step, and the difficulty of resin filling is reduced. Therefore, productivity can be remarkably improved, and furthermore, molding accuracy can be improved.

In particular, when the top plate member is constituted by a first base comprising a groove corresponding to an ink flow path and a lower part of an orifice plate, and a second base comprising an upper part of the orifice plate, an ink liquid chamber and an ink supply port. However, since the first base has a simple shape, it is easy to form a uniform thickness. As a result, the resin can be made to flow stably, and high-precision molding can be performed. On the other hand, when the portion of the ink liquid chamber that is in close contact with the substrate member is configured as the first substrate, the portion of the top plate member that is in close contact with the substrate member is the same substrate, so that the lower surface of the ink liquid chamber is Since the mold and the mold piece for transferring the lower surface of the ink flow path are arranged in the same mold, the accuracy of the step difference between the two can be easily obtained in the production of the mold. Therefore, even if the top plate member is formed by two-color molding, the step between the lower surface of the ink liquid chamber and the lower surface of the ink flow path is formed with high precision.

[Brief description of the drawings]

FIG. 1 is an external perspective view illustrating an example of a chip configuration of a liquid jet recording head according to a first embodiment of the present invention.

FIG. 2 is an exploded perspective view of the liquid jet recording head shown in FIG.

FIG. 3 is a perspective view of the top plate shown in FIG. 1 as viewed from the front side.

FIG. 4 is a perspective view of the top plate shown in FIG. 1 as viewed from the rear side.

FIG. 5 is a sectional view of the top plate shown in FIG. 1;

FIG. 6 is a cross-sectional view illustrating a configuration of a top plate of a liquid jet recording head according to a second embodiment of the invention.

FIG. 7 is a perspective view of a top plate of a liquid jet recording head according to Embodiment 3 of the present invention.

FIG. 8 is an exploded perspective view of the top plate shown in FIG. 7 as viewed from the front side of the orifice plate.

9 is an exploded perspective view of the top plate shown in FIG. 7 as viewed from the back side of the orifice plate.

FIG. 10 is a perspective view showing a modification of the top plate of the liquid jet recording head according to Embodiment 3 of the present invention.

FIG. 11 is a schematic sectional view of a top plate of a liquid jet recording head according to Embodiment 4 of the present invention.

FIG. 12 is a schematic sectional view of a top plate of a liquid jet recording head according to Embodiment 5 of the present invention.

FIG. 13 is a schematic view of a conventional liquid jet recording head.

FIG. 14 is a cross-sectional view of the liquid jet recording head shown in FIG. 13, showing a bonding state between a top plate and a heater board.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Heater board 3 Base plate 5 Top plate 5a Receiving part 6 Orifice plate 6a Discharge port 6c Orifice plate lower part 6d Orifice plate upper part 7 Nozzle 7a Nozzle lower surface 8 Ink liquid chamber 8a lower 8b Upper 8c Ink liquid chamber outer wall lower surface 9 Ink supply port 10 Spring 21 First substrate 22 Second substrate 31, 32, 31 ', 32' Concavo-convex array 31a, 32a Convex portion 31b, 32b Concave portion 41 Ink contact portion substrate 42 Non-ink contact portion substrate 51 Ink discharge portion substrate 52 Ink supply portion substrate 53 Outer peripheral base

Continued on the front page (72) Inventor Keizo Naganuma 3-30-2 Shimomaruko, Ota-ku, Tokyo F-term in Canon Inc. (reference) 2C057 AF24 AF93 AG12 AG46 AP02 AP24 AP45 BA05 BA13

Claims (27)

[Claims] 1. A substrate member provided with ejection energy generating elements for applying ejection energy to ink corresponding to a plurality of ink flow paths; a plurality of grooves corresponding to the plurality of ink flow paths; An orifice plate provided with a discharge port communicating with one end of each of the grooves, and an ink liquid chamber communicating with each of the grooves at the other end of each of the grooves to supply ink to each of the grooves. An ink supply port for supplying ink to the ink liquid chamber, and a top plate member and the substrate member, wherein the groove, the orifice plate, the ink liquid chamber, and the ink supply port are integrally formed. In a liquid jet recording head in which a plurality of ink ejection paths are formed by joining, the orifice plate has an orifice having the ejection port with a boundary above the ejection port. Lower part of the disk plate,
The top plate member is divided into an upper portion of the orifice plate not including the discharge port, the top plate member includes a first base including the groove and the lower portion of the orifice plate, and an upper portion of the orifice plate.
Liquid jet recording comprising the ink liquid chamber and a second substrate comprising the ink supply port, wherein the first substrate and the second substrate are joined and formed integrally by two-color molding. head. 2. A substrate member provided with an ejection energy generating element for applying ejection energy to ink corresponding to a plurality of ink flow paths, a plurality of grooves corresponding to the plurality of ink flow paths, and ink being discharged. An orifice plate provided with a discharge port communicating with one end of each of the grooves, and an ink liquid chamber communicating with each of the grooves at the other end of each of the grooves to supply ink to each of the grooves. An ink supply port for supplying ink to the ink liquid chamber, and a top plate member and the substrate member, wherein the groove, the orifice plate, the ink liquid chamber, and the ink supply port are integrally formed. In the liquid ejection recording head in which a plurality of ink ejection paths are formed by joining, the orifice plate has an orifice having the ejection port with a boundary above the ejection port. Lower part of the disk plate,
An upper portion of the orifice plate that does not include the discharge port, wherein the top plate member includes a groove, a lower portion of the orifice plate, and a portion of an outer wall of the ink liquid chamber that is in close contact with the substrate member. And an upper portion of the orifice plate, a portion of the ink liquid chamber excluding the first base, and a second base including the ink supply port, and the first base and the second base are formed by two-color molding. A liquid jet recording head, which is integrally formed by bonding with a liquid jet recording head. 3. A substrate member provided with ejection energy generating elements for applying ejection energy to ink corresponding to a plurality of ink flow paths, a plurality of grooves corresponding to the plurality of ink flow paths, and ink being ejected. An orifice plate provided with a discharge port communicating with one end of each of the grooves, and an ink liquid chamber communicating with each of the grooves at the other end of each of the grooves to supply ink to each of the grooves. An ink supply port for supplying ink to the ink liquid chamber, and a top plate member and the substrate member, wherein the groove, the orifice plate, the ink liquid chamber, and the ink supply port are integrally formed. In a liquid jet recording head in which a plurality of ink ejection paths are formed by joining, the ink liquid chamber is divided into a plurality by a partition wall formed integrally with the top plate member, The orifice plate has a lower portion of the orifice plate having the discharge port, with the upper side of the discharge port as a boundary,
The top plate member is divided into an upper portion of the orifice plate that does not include the discharge port, and the top plate member has a groove, a lower portion of the orifice plate, a portion of the outer wall of the ink liquid chamber that is in close contact with the substrate member, and A first base part comprising a part which is in close contact with the substrate member, an upper part of the orifice plate, a part of the ink liquid chamber excluding the first base, a part of the partition wall excluding the first base, and A second substrate comprising an ink supply port,
A liquid jet recording head, wherein the first base and the second base are joined and formed integrally by two-color molding. 4. The method according to claim 1, wherein the first base is formed of a transparent member.
Item 6. The liquid jet recording head according to item 1. 5. The liquid jet recording head according to claim 1, wherein the first base is formed of polysulfone. 6. The method according to claim 1, wherein the first substrate is formed of a pure material that does not include a filler.
6. The liquid jet recording head according to any one of items 5 to 5. 7. The method according to claim 1, wherein the second substrate is formed of a composite material filled with a filler.
7. The liquid jet recording head according to any one of items 6 to 6. 8. The method according to claim 1, wherein the base resin of the material forming the second base is the same as the base resin of the material forming the first base. The liquid jet recording head according to the above. 9. The method according to claim 1, wherein the second substrate is formed by metal injection.
The liquid jet recording head according to any one of the above items. 10. The liquid according to claim 1, wherein the second base is formed of a material having a smaller coefficient of linear expansion than a material forming the first base. Jet recording head. 11. The method according to claim 1, wherein the second base is formed of a material having a lower molding shrinkage than a material forming the first base.
Item 6. The liquid jet recording head according to item 1. 12. The liquid jet according to claim 1, wherein the second base is formed of a material having a higher elastic modulus than a material forming the first base. Recording head. 13. A part of a boundary surface between the first base and the second base is formed with an uneven row composed of a plurality of recesses and a plurality of protrusions, and the protrusions of the first base are formed by the protrusions. The liquid jet recording according to any one of claims 1 to 12, wherein the concave portion of the two substrates enters the concave portion of the second substrate, and the convex portion of the second substrate enters the concave portion of the first substrate. head. 14. The liquid jet recording head according to claim 13, wherein the concave and convex portions of the concave and convex rows are arranged alternately and at equal intervals. 15. The liquid jet recording head according to claim 13, wherein the concave and convex rows are arranged in the same direction as the arrangement direction of the grooves provided in the top plate. 16. A substrate member provided with an ejection energy generating element for applying ejection energy to ink corresponding to a plurality of ink flow paths, a plurality of grooves corresponding to the plurality of ink flow paths, and ink being discharged. An orifice plate provided with a discharge port communicating with one end of each of the grooves, and an ink liquid chamber communicating with each of the grooves at the other end of each of the grooves to supply ink to each of the grooves. An ink supply port for supplying ink to the ink liquid chamber, and a top plate member and the substrate member, wherein the groove, the orifice plate, the ink liquid chamber, and the ink supply port are integrally formed. In a liquid ejection recording head in which a plurality of ink ejection paths are formed by joining, the orifice plate has an orifice having the ejection port with a boundary above the ejection port. The lower part of the fiss plate,
The top plate member is divided into an upper portion of an orifice plate that does not include the discharge port, and the top plate member is configured by an ink contact portion base including a portion that is in contact with ink, and a non-ink contact portion base including a portion that does not contact with the ink. A liquid jet recording head, wherein an ink contact portion substrate and the non-ink contact portion substrate are joined and integrally formed by multicolor molding. 17. The ink contact portion base includes the groove, the orifice plate lower portion, the inner wall of the ink liquid chamber, and the ink supply port inner wall, and the non-ink contact portion base includes the orifice plate upper portion. 17. The liquid jet recording head according to claim 16, wherein the liquid jet recording head is constituted by an outer peripheral portion of the top plate member. 18. The ink contact portion base includes: an ink discharge portion base including the groove and the lower portion of the orifice plate; and an ink supply portion base including the inner wall of the ink liquid chamber and the inner wall of the ink supply port. 18. The liquid jet recording head according to claim 16, wherein the liquid jet recording head is formed by being divided into a base. 19. The ink contact portion base body is formed of a transparent member.
9. The liquid jet recording head according to any one of 8. 20. The liquid jet recording head according to claim 16, wherein the ink contact portion base is formed of polysulfone. 21. The liquid jet recording head according to claim 16, wherein a material forming the ink contact portion base is a pure material containing no filler. 22. The liquid jet recording head according to claim 16, wherein a material forming the non-ink contact portion base is a composite material filled with a filler. 23. The ink jet printer according to claim 16, wherein the base resin of the material constituting the non-ink contact base is the same as the base resin of the ink contact base. Liquid jet recording head. 24. The liquid jet recording head according to claim 16, wherein the non-ink contact portion base is formed by metal injection. 25. The material forming the non-ink contact portion base has a smaller linear expansion coefficient than the material forming the ink contact portion base.
The liquid jet recording head according to any one of the above items. 26. The material forming the non-ink contact portion base has a lower molding shrinkage than the material forming the ink contact portion base.
The liquid jet recording head according to any one of the above items. 27. The material according to claim 16, wherein a material forming the non-ink contact portion base has a higher elastic modulus than a material forming the ink contact portion base. Liquid jet recording head.