JP3314810B2 - Ink jet recording head and method of manufacturing the same - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ink jet recording head for ejecting ink supplied from an ink tank as ink droplets and a method for manufacturing the same.

[0002]

2. Description of the Related Art A recording head of an ink jet recording apparatus includes a head body for discharging ink as ink droplets, and an ink cartridge for storing ink to be supplied to the head body. The recording head is provided with an ink supply needle, the ink cartridge is provided with an ink supply port, and the ink is supplied to the head body via the ink supply needle inserted with the ink supply port. .

More specifically, as shown in FIG. 15, for example, a recording head is provided with a head body 1 for ejecting ink droplets in response to a print signal on a lower surface of a head holder 10. At the top, a cartridge case 12 for accommodating the ink cartridge 2 is provided.
Is provided. The ink cartridge 2 has a positioning projection 13 formed on the lower surface thereof, and an ink supply port 4 formed on the lower surface of the positioning projection 13. The opening of the ink supply port 4 is sealed with the film 14 until the ink cartridge 2 is mounted on the recording head.

On the other hand, a concave portion 11 is formed on the upper surface of the head holder 10 so that the positioning protrusion 13 is fitted therein, and the ink supply needle 3 is provided upright in the concave portion 11. In an apparatus that performs color printing using a plurality of colors of ink,
The ink cartridge 2 is partitioned into a plurality of ink chambers 15. For example, as shown in FIG.
The ink cartridge 2 is divided into four chambers filled with four black inks, and a plurality of ink supply ports 4 of the ink cartridge 2 are provided for each ink chamber 15 (in other words, for each color). Four are provided for each. FIG. 15 shows a state before the ink cartridge 2 is mounted.

[0005] The tip of the ink supply needle 3 is shown in FIG.
As shown in FIG. 2, the ink supply port 4 is formed in a conical shape so as to easily break through the film. An ink guide hole 6 penetrating vertically is formed in the inclined surface 8 at the tip. A first ink flow path 5 communicating with the ink guide hole 6 is formed inside the ink supply needle 3, and is guided into the first ink flow path 5 of the ink supply needle 3 in the head holder 10. A second ink flow path 7 for supplying the ink to the head main body 1 is formed. A filter 9 for filtering the ink supplied from the ink cartridge 2 is provided at the entrance of the second ink flow path 7. The second ink flow path 7 is provided so as to extend obliquely toward the central head main body 1 to guide the ink to the head main body 1 having a smaller width dimension than the ink cartridge 2 (see FIG. 16).

In the above recording head, the cartridge 2
At the time of mounting, the tip of the ink supply needle 3 breaks through the film 14 sealing the ink supply port 4 of the cartridge 2, and the ink supply needle 3 is inserted into the ink supply port 4.
Then, the ink in the ink cartridge 2 is supplied to the head main body 1 through the ink guide hole 6 of the ink supply needle 3 and the first ink flow path 5 and the second ink flow path 7.

The recording head is mounted on a carriage (not shown) together with the ink cartridge 2, and reciprocates in the width direction of the recording paper by the carriage to discharge ink droplets from nozzle openings provided in the head body 1. The printing is performed, and the ink consumed in the printing is supplied from the ink cartridge 2 to the head main body 1 via the ink supply needle 3.

[0008]

However, in the above recording head, the second ink flow path 7 extends obliquely toward the head main body 1 in order to guide the ink to the head main body 1 having a smaller width dimension than the ink cartridge 2. It is formed as follows. As described above, it is necessary to form an oblique hole that requires complicated processing in the recording head, and an increase in cost cannot be avoided. Further, since the second ink flow path 7 is formed obliquely, there is a limit in reducing the height dimension of the recording head itself, and there is a demand for miniaturization required in recent ink jet recording heads. It is not something that can respond.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and is easy to process and assemble, is low in cost, can be reduced in size, and has almost no air bubbles in the flow path. It is an object to provide a recording head and a method for manufacturing the recording head.

[0010]

According to a first aspect of the present invention, there is provided a head body for discharging ink, and a flow path for guiding ink supplied from an ink tank to the head body. An ink jet recording head, wherein a groove forming the flow path is provided and the ink tank is provided.
Forming plate formed integrally with holding member for holding
And sealing the opening of the groove by being fixed to the channel forming plate.
And a sealing plate sealed to the flow path forming plate.
And the sealing plate and the flow path forming plate are welded through an agent.
An ink jet type recording head having a support rib for defining a distance between the two .

In the first aspect, since the portion forming the flow path of the recording head is composed of two disc-shaped members,
The recording head can be significantly reduced in size as compared with a conventional one in which a flow path is formed by oblique holes. Also, the holding part
By joining the sealing plate to the material, the opening of the groove is sealed.
Processing, assembling is easy, and manufacturing costs are reduced.
be able to.

[0012]

Further, since the sealing plate is welded to the flow path forming plate, dust and the like hardly enter the flow path. In addition, it is relatively easy to assemble without oblique holes requiring complicated processing, so that the cost is low.

According to a second aspect of the present invention, there is provided the first aspect.
Te, welding of the sealing plate to the flow path forming plate has been performed by welding pins projecting from the said flow path forming plate is melted deformed is inserted into the insertion hole of the sealing plate Ink-jet recording head.

According to the second aspect, the assembly is easy and easy to automate, the cost can be reduced, finer scum is less likely to be generated as compared with ultrasonic welding or the like, and dust and the like are mixed in the flow path. Is further reduced.

A third aspect of the present invention is directed to the second aspect.
The welding pin is formed at a portion surrounding the groove of the flow path forming board.

In the third aspect, even when an external force is applied to the sealing plate, the mounting between the sealing plate and the flow path forming plate is less likely to rattle, and ink leakage and the like are less likely to occur.

A fourth aspect of the present invention is directed to the third aspect.
Further , in the ink jet type recording head, a plurality of the welding pins are formed around a groove of the flow path forming board.

In the fourth aspect, even when an external force is applied to the sealing plate, the mounting between the sealing plate and the flow path forming plate is less likely to be loose, and ink leakage and the like are less likely to occur.

According to a fifth aspect of the present invention, there is provided any one of the first to fourth aspects.
In the above aspect, there is provided an ink jet recording head, further comprising a filter for filtering ink supplied from the ink tank, wherein the flow path guides the ink passed through the filter to the head main body.

In the fifth aspect, dust and the like are not mixed in the flow path in which fine dust and the like are not allowed to be mixed, which is extremely effective.

According to a sixth aspect of the present invention, ink is ejected.
Move the ink supplied from the ink tank to the head
Ink-jet recording device having a flow path leading to the recording head body
Recording head, wherein a groove forming the flow path is provided.
Formed integrally with a holding member for holding the ink tank.
Flow path forming plate, and fixed to the flow path forming plate via a sealant.
And a sealing plate for sealing the opening of the groove,
Opposition of the partition wall around the groove of the flow path forming board to the sealing plate
The surface is the gap between the flow path forming board and the sealing plate is the groove side.
It becomes an inclined surface that gradually inclines toward
Outside the inclined surface of the channel forming board,
A step to form a concave portion to which a cooling agent is applied.
Ink-jet recording heads
You.

In the sixth aspect, since the inclined surface which is gradually inclined downward toward the groove is provided at the peripheral portion of the groove on the board surface, the inclined surface is sealed with the board surface sealed by the sealing plate. Since a small gap is formed in the portion, the sealant is held in this gap, and the sealant is unlikely to protrude into the flow path. Therefore, unlike the related art, the sealant hardly protrudes into the flow path, and troubles such as defective ejection due to air bubbles adhering to the sealant are also prevented.

[0024]

Further, the operation of applying the sealant to the step is facilitated. In other words, in order to prevent the sealant from protruding, it is only necessary to reduce the amount of the sealant to be applied.However, if the amount of the sealant is excessively reduced, it becomes difficult to control the application of the sealant. It breaks off, resulting in poor sealing. As described above, by applying the sealant to the steps, the amount of the sealant substantially contributing to the seal when sealed with the sealing plate can be reduced. Therefore, even if the applied amount of the sealing agent is not unnecessarily reduced, the protrusion of the sealing agent can be effectively prevented, the control of the applied amount becomes easy, and the sealing failure does not occur.

According to a seventh aspect of the present invention, there is provided a method according to the sixth aspect.
And the gradient of the inclined surface is 5/1000 or more and 1000/1000.
The ink jet recording head is set to 200 / min or less.

In the seventh aspect, the gap between the inclined surfaces formed in a state where the board surface is sealed with the sealing plate is sufficiently small, and even if air bubbles adhere to the sealant, the gap is extremely small. As a result, air bubbles are less likely to come off from the sealant, and the occurrence of troubles such as poor ejection is prevented.

An eighth aspect of the present invention is directed to the sixth or seventh aspect.
In, in an ink jet recording head, wherein a flat portion is provided between the inclined surface and the step of the flow channel forming plate.

In the eighth aspect, the sealing effect between the flow path forming board and the sealing plate is not reduced.

[0030] A ninth aspect of the present invention is the ninth aspect, wherein:
And a corner formed by the step and the flat portion is removed.

In the ninth aspect, when the sealant applied to the step is pressed by the sealing plate and is extended toward the flat portion, the sealant accumulates at the removed corner portion, and the sealant is collected more than necessary. As a result, the sealing agent does not go to the flat portion, so that the effect of preventing the sealant from protruding is further improved.

According to a tenth aspect of the present invention , an ink is ejected.
Head and the ink supplied from the ink tank.
An ink jet type having a flow path leading to the head body
A recording head, wherein a groove forming the flow path is provided.
It is formed integrally with a holding member that holds the ink tank.
A flow path forming plate to be fixed to the flow path forming plate;
A sealing plate for sealing the opening, wherein the sealing plate is provided with an ink supply hole for supplying the ink in the flow path to the head body, and the ink supply hole is provided on the sealing plate. The ink jet recording head is characterized in that the opening pitch of the ink supply holes is longer on the flow path side than on the head main body side by being obliquely penetrated with respect to the plate surface.

In the tenth aspect, even if the opening pitch of the ink supply holes on the head body side matches the pitch of the ink supply pipes of the head body, the opening pitch of the ink supply holes on the flow path side is wider than that. Become. Therefore, it is possible to allow a sufficient dimension, and it is possible to sufficiently secure the width of the flow path forming plate at a portion corresponding to the ink supply hole of the flow path forming plate. Therefore, unlike the conventional case, the sealing is not sufficiently performed, and the sealing agent hardly protrudes into the flow path, and it is possible to prevent the occurrence of troubles such as discharge failure due to air bubbles adhering to the sealing agent.

[0034] An eleventh aspect of the present invention is directed to the tenth aspect.
The groove is defined by being fixed to the sealing plate.
The width dimension of the surrounding part of the groove to be formed , over the entire circumference,
An ink jet recording head characterized by being set to 1.0 mm or more.

According to the eleventh aspect, the sealing does not become insufficient and the sealing agent does not protrude into the flow path, and troubles such as defective discharge due to air bubbles adhering to the sealing agent are surely generated. Can be prevented.

The twelfth aspect of the present invention is directed to the tenth or eleventh aspect.
In an embodiment of the head main body side of the opening of the ink supply holes is in the ink jet recording head is characterized in that it is formed in a circular shape.

In the thirteenth aspect, the shape of the opening of the ink supply hole is simple, the manufacturing cost does not increase, the sealing performance does not decrease, and the number of bubbles is reduced. That is, when the ink supply hole penetrating obliquely is formed by a pin having a normal circular cross section, the shape of the opening of the ink supply hole becomes elliptical. For this reason, the opening of the ink supply tube of the head main body must be formed in an elliptical shape in accordance with the opening, and it is necessary to use an elliptical packing or the like in this portion.

As described above, since other members must be prepared in an elliptical shape, the manufacturing cost as a whole becomes extremely high, and the sealing performance is deteriorated.
It may cause bubbles to be caught. In the present invention, since the opening of the ink supply hole of the sealing plate is circular, the above-mentioned problems are solved, low cost, good sealing performance is obtained, and bubbles are hardly caught.

The thirteenth aspect of the present invention is directed to the tenth to twelfth aspects.
In any one of the embodiments, an ink jet recording head is characterized in that a step-down portion is formed around the opening of the ink supply hole of the sealing plate.

In the thirteenth aspect, the sealing property of the ink supply hole opening is hardly reduced.

According to a fourteenth aspect of the present invention, there is provided an ink jet recording head comprising a head body for discharging ink and a flow path for guiding ink supplied from an ink tank to the head body. a flow path forming plate having a groove to be formed is provided with, and a sealing plate for sealing an opening of the groove are fixed via the sealant flow passage forming plate, said
Opposition of the partition wall around the groove of the flow path forming board to the sealing plate
The surface is the gap between the flow path forming board and the sealing plate is the groove side.
It becomes an inclined surface that gradually inclines toward
Outside of the inclined surface of the partition wall of the flow path forming board
A step forming a concave portion to which the sealant is applied is provided.
In an ink jet recording head, characterized by being kicked.

In the fourteenth aspect, the portion forming the flow path of the recording head is composed of two disc-shaped members.
The recording head can be significantly reduced in size. In addition, since an inclined surface that is gradually inclined downward toward the groove is provided at a peripheral portion of the groove on the board surface, a slight gap is formed in the inclined surface portion while the board surface is sealed with the sealing plate. Therefore, the sealant is held in the gap, and the sealant does not easily protrude into the flow path. Therefore, unlike the related art, the sealant hardly protrudes into the flow path, and troubles such as defective ejection due to air bubbles adhering to the sealant are also prevented.

[0043]

Further, the work of applying the sealant to the step is facilitated. In other words, in order to prevent the sealant from protruding, it is only necessary to reduce the amount of the sealant to be applied.However, if the amount of the sealant is excessively reduced, it becomes difficult to control the application of the sealant. It breaks off, resulting in poor sealing. As described above, by applying the sealant to the steps, the amount of the sealant substantially contributing to the seal when sealed with the sealing plate can be reduced. Therefore, even if the applied amount of the sealing agent is not unnecessarily reduced, the protrusion of the sealing agent can be effectively prevented, the control of the applied amount becomes easy, and the sealing failure does not occur.

The fifteenth aspect of the present invention is directed to the fourteenth aspect.
In this case, the inclination of the inclined surface is not less than 5/1000 and not more than 10/1000.
An ink jet recording head is set at 200/00 or less.

In the fifteenth aspect, the gap between the inclined surfaces formed in a state where the board surface is sealed with the sealing plate is sufficiently small, and even if air bubbles adhere to the sealant, the gap is extremely small. As a result, air bubbles are less likely to come off from the sealant, and the occurrence of troubles such as poor ejection is prevented.

The sixteenth aspect of the present invention is directed to the fourteenth or fifteenth aspect.
In the above aspect, a flat portion is provided between the inclined surface of the holding member and the step.

In the sixteenth aspect, the sealing effect between the flow path forming board and the sealing plate is not reduced.

[0049] A seventeenth aspect of the present invention is directed to the sixteenth aspect.
And a corner formed by the step and the flat portion is removed.

In the seventeenth aspect, when the sealant applied to the step is pressed by the sealing plate and extended toward the flat portion, the sealant accumulates at the removed corner portion, and the sealant is unnecessarily necessary. As a result, the sealing agent does not go to the flat portion, so that the effect of preventing the sealant from protruding is further improved.

According to an eighteenth aspect of the present invention, there is provided an ink jet recording head comprising: a head body for discharging ink; and a flow path for guiding ink supplied from an ink tank to the head body. And a sealing plate fixed to the flow channel forming plate and sealing an opening of the groove, wherein the sealing plate includes the flow channel. An ink supply hole for supplying the ink to the head main body is formed, and the ink supply hole is obliquely penetrated with respect to the plate surface of the sealing plate. An ink jet recording head is characterized in that it is longer on the flow path side than on the main body side.

In the eighteenth aspect, the portion forming the flow path of the recording head is composed of two disc-shaped members.
The recording head can be significantly reduced in size. Further, even if the pitch of the opening of the ink supply holes on the head main body side is made to match the pitch of the ink supply pipes of the head main body, the opening pitch of the ink supply holes on the flow path side becomes wider. Therefore, it is possible to allow a sufficient dimension, and it is possible to sufficiently secure the width of the flow path forming plate at a portion corresponding to the ink supply hole of the flow path forming plate. Therefore, unlike the conventional case, the sealing is not sufficiently performed, and the sealing agent hardly protrudes into the flow path, and it is possible to prevent the occurrence of troubles such as discharge failure due to air bubbles adhering to the sealing agent.

A nineteenth aspect of the present invention is directed to the eighteenth aspect.
The groove is defined by being fixed to the sealing plate.
The width dimension of the peripheral portion of the groove to be formed , over the entire circumference,
An ink jet recording head characterized by being set to 1.0 mm or more.

In the nineteenth aspect, the sealing is not sufficiently performed, the sealing agent does not protrude into the flow path, and troubles such as defective discharge due to air bubbles adhering to the sealing agent are reliably generated. Can be prevented.

The twentieth aspect of the present invention is directed to the eighteenth or nineteenth aspect.
In an embodiment of the head main body side of the opening of the ink supply holes is in the ink jet recording head is characterized in that it is formed in a circular shape.

In the twentieth aspect, the shape of the opening of the ink supply hole is simple, the manufacturing cost is not increased, the sealing performance is not reduced, and the number of bubbles is reduced. That is, when the ink supply hole penetrating obliquely is formed by a pin having a normal circular cross section, the shape of the opening of the ink supply hole becomes elliptical. For this reason, the opening of the ink supply tube of the head main body must be formed in an elliptical shape in accordance with the opening, and it is necessary to use an elliptical packing or the like in this portion.

As described above, since other members must be prepared in an elliptical shape, the manufacturing cost as a whole is extremely high, and the sealing performance is deteriorated.
It may cause bubbles to be caught. In the present invention, since the opening of the ink supply hole of the sealing plate is circular, the above-mentioned problems are solved, low cost, good sealing performance is obtained, and bubbles are hardly caught.

The twenty-first aspect of the present invention relates to any of the eighteenth to twentieth aspects.
In any of the above aspects, there is provided an ink jet recording head, wherein a step-down portion is formed around the opening of the ink supply hole of the sealing plate.

In the twenty-first aspect, the sealing property of the ink supply hole opening is hardly reduced.

The twenty-second aspect of the present invention is directed to the eighteenth to twenty-first aspects.
In any one of the aspects, there is provided an ink jet recording head, wherein a sealant is provided at least around the groove between the flow path forming board and the sealing plate.

In the twenty-second aspect, the groove of the flow path forming board is sealed by the sealant to reliably form the ink flow path, and almost no dust or the like enters the flow path.

The twenty-third aspect of the present invention is directed to the twenty-second aspect.
Oite, the flow channel forming plate and said sealing plate is in the ink jet recording head is characterized in that it is fixed through the sealant.

In the twenty-third aspect, the groove of the flow path forming board is sealed by the sealant, the flow path of the ink is reliably formed, and dust and the like hardly enter the flow path.

The twenty-fourth aspect of the present invention is directed to the twenty-second or twenty-third aspect.
In the above aspect, the sealant may be made of a silicone-based resin.

In the twenty-fourth aspect, since the sealing plate is welded to the flow path forming board, dust and the like hardly enter the flow path. In addition, it is relatively easy to assemble without oblique holes requiring complicated processing, so that the cost is low.

According to a twenty-fifth aspect of the present invention, there is provided an ink jet recording head comprising: a head body for discharging ink; and a flow path for guiding ink supplied from an ink tank to the head body. And a sealing plate fixed to the flow channel forming plate and sealing the opening of the groove, wherein the sealing plate is formed of the flow channel type.
The sealing plate and the sealing plate are welded to a platen via a sealant.
There is a support rib between the flow path forming board and the
An ink jet recording head is characterized in that:

In the twenty-fifth aspect, the portion forming the flow path of the recording head is composed of two disc-shaped members.
The recording head can be significantly reduced in size. Further, since the sealing plate is welded to the flow path forming board, dust and the like hardly enter the flow path. In addition, it is relatively easy to assemble without oblique holes requiring complicated processing, so that the cost is low.

A twenty-sixth aspect of the present invention is directed to the twenty-fifth aspect.
Here , the welding of the sealing plate to the flow path forming plate is performed by inserting a welding pin protruding from the flow path forming plate into the insertion hole of the sealing plate and performing a melting deformation. The ink jet recording head is characterized in that:

In the twenty-sixth aspect , assembling is easy, automation is easy, cost can be reduced, finer scum is less likely to occur than ultrasonic welding or the like, and dust and the like are mixed in the flow path. Is further reduced.

A twenty-seventh aspect of the present invention is directed to the twenty-sixth aspect.
Oite the welding pin is in the ink jet recording head is characterized in that it is formed in a portion surrounding the groove of the passage forming plate.

In the twenty-seventh aspect, even when an external force is applied to the sealing plate, the mounting between the sealing plate and the flow path forming plate is less likely to be loose, and ink leakage and the like are less likely to occur.

The twenty-eighth aspect of the present invention is directed to the twenty-seventh aspect.
In the ink jet recording head, a plurality of welding pins are formed around a groove of the flow path forming board.

In the twenty-eighth aspect, even when an external force is applied to the sealing plate, the mounting between the sealing plate and the flow path forming plate is less likely to rattle, and ink leakage and the like are less likely to occur.

The twenty-ninth aspect of the present invention relates to the twenty-fifth to twenty-eighth aspects.
In any one of the embodiments, the ink jet recording head further includes a filter for filtering the ink supplied from the ink tank, wherein the flow path guides the ink that has passed through the filter to the head main body. is there.

In the twenty-ninth aspect, dust and the like are not mixed in the flow path in which fine dust and the like are not allowed to be mixed, which is extremely effective.

The thirtieth aspect of the present invention relates to the twenty-fifth to twenty-ninth aspects.
In any one of the embodiments, the sealant is made of a silicone-based resin.

In the thirtieth aspect, the sealant is hardly deteriorated or aged by the ink, and the ink is hardly leaked.

The thirty-first aspect of the present invention is directed to the fourteenth to thirtieth aspects.
In any one of the aspects, the ink jet recording may be configured such that the flow path forming board is formed integrally with a holding member that holds the ink tank, and a member that is joined to the holding member serves as the sealing plate. In the head.

In the thirty-first aspect , working and assembly are facilitated, and manufacturing costs can be reduced. In addition, by joining the sealing plate to the holding member, the opening of the groove is sealed.

The thirty-second aspect of the present invention is directed to the fourteenth to thirtieth aspects.
In any one of the aspects, the ink jet recording head is characterized in that the flow path forming board in which the groove is formed is a separate member from a holding member that holds the ink tank.

In the thirty-second aspect, the manufacture of each part is facilitated, and the manufacturing cost can be reduced.

A thirty-third aspect of the present invention is directed to the thirty-second aspect.
Oite, the separate member is an ink jet recording head, characterized by defining a bottom and sidewalls of the trench.

In the thirty-third aspect , the groove is formed by the separate member defining the bottom and the side wall of the groove and the sealing plate.

The thirty-fourth aspect of the present invention is directed to the thirty-second aspect.
Oite, the separate member is an ink jet recording head and having a through portion defining a side wall of the groove.

In the thirty-fourth aspect , a groove is formed by another member having a penetrating portion, a member sealing one surface of the penetrating portion to define a bottom portion, and a sealing plate.

The thirty-fifth aspect of the present invention is directed to
In one aspect of the present invention, the groove has one end in a longitudinal direction communicating with the ink tank and the other end communicating with the head main body.

In the thirty-fifth aspect, the arrangement of the grooves enables the size of the head body to be significantly reduced regardless of the size of the ink tank.

The thirty-sixth aspect of the present invention is directed to the thirty-fifth aspect.
In the ink jet type recording head, the groove is arranged such that the one end side is separated and the other end side is close to each other.

In the thirty-sixth aspect, the head body can be significantly reduced in size regardless of the size of the ink tank by arranging the end of the groove on the head body side close to the groove.

The thirty-seventh aspect of the present invention is directed to the thirty-sixth aspect.
The groove is provided corresponding to each type of ink ejected from the head main body.

In the thirty-seventh aspect, a plurality of types of ink can be supplied to the head main body through the groove to discharge a plurality of types of ink.

A thirty-eighth aspect of the present invention is directed to a head main body for discharging ink, a flow path forming board provided with a groove for forming a flow path for guiding ink supplied from an ink tank to the head main body, A sealing plate fixed to the flow path forming board via a sealing agent to seal the opening of the groove, wherein the sealing plate supplies ink in the flow path to the head main body. A supply hole is formed, and the ink supply hole is obliquely penetrated with respect to the plate surface of the sealing plate so that an opening pitch of the ink supply hole is longer on the flow path side than on the head main body side. A method of manufacturing an ink jet recording head according to the above, wherein a supply hole forming pin is provided with respect to a mold surface corresponding to a plate surface of the sealing plate in the molding space of a mold having a molding space for molding a sealing plate. The molding material in the molding space. Mixture was allowed to fully solidify, in a method for manufacturing the ink jet recording head is characterized in that so as to form the ink supply hole by pulling the supply hole forming pins.

In the thirty-eighth aspect, the ink jet recording head of the present invention can be easily obtained at low cost.

The thirty-ninth aspect of the present invention is directed to the thirty-eighth aspect.
Oite, wherein a supply hole forming pin, an ink jet recording head shape abutting the distal end face on the mold surface corresponding to the plate surface of the sealing plate, characterized in that to use a thing that is a circular Manufacturing method.

In the thirty-ninth aspect, the shape of the opening of the ink supply hole is simple, the manufacturing cost does not increase, the sealability does not decrease, and the number of bubbles is reduced.

[0096] The fortieth aspect of the present invention is directed to the thirty-ninth aspect.
In addition , as the supply hole forming pin, a portion having a large diameter near a mold surface corresponding to another plate surface of the sealing plate is used, In the manufacturing method.

In the fortieth aspect, a stepped portion can be formed relatively easily at the edge of the opening of the ink supply port, and the stepped portion hardly reduces the sealing property of the opening of the ink supply hole.

A forty-first aspect of the present invention relates to a head main body for discharging ink, a flow path forming plate provided with a groove for forming a flow path for guiding ink supplied from an ink tank to the head main body, A method of manufacturing an ink jet recording head having a sealing plate for sealing an opening of a groove, comprising applying a sealant around a groove of the flow path forming board,
An ink jet recording head, wherein the sealing plate is welded to the flow path forming board, and the sealing plate and the flow path forming substrate are fixed in a state where the sealing agent is held around the groove. In the manufacturing method.

In the forty-first aspect, the channel forming board and the sealing plate can be easily fixed, and the groove can be securely sealed.

A forty-second aspect of the present invention is directed to the forty-first aspect.
Oite, together with the flow channel substrate has a welding pin which is突接the bonding surface side of the sealing plate, has an insertion hole into which the sealing plate the welding pin is inserted, the flow path The welding of the sealing plate to the forming plate, the welding pin of the flow path forming plate is performed by being inserted through the insertion hole of the sealing plate and melted and deformed, wherein In the manufacturing method.

In the forty-second aspect , assembling is easy, automation is easy, cost can be reduced, finer scum is less likely to be generated as compared with ultrasonic welding or the like, and dust and the like are mixed in the flow path. Is further reduced.

The forty-third aspect of the present invention provides the forty-first or forty-second aspect.
The method according to the above aspect , wherein the sealant is made of a silicone resin.

In the forty-third aspect, deterioration and aging of the sealant due to ink hardly occur, and ink leakage and the like hardly occur.

[0104]

Next, embodiments of the present invention will be described in detail.

(Embodiment 1) FIGS. 1 and 2 are views showing an example of an ink jet recording head 18 according to Embodiment 1 of the present invention. The recording head 18 is a box-shaped cartridge case 2 that is open to the upper surface.
0 and a head body 21 attached to the lower surface of the cartridge case 20.

The cartridge case 20 is formed with a partition wall 22 slightly closer to one side from the center, and is internally partitioned into two storage chambers 23a and 23b for storing ink cartridges. In the large storage chamber 23a (the right side in FIG. 1), three ink supply needles 24a are provided upright at the bottom.
On the other hand, in the small storage chamber 23b (the left side in FIG. 1), one ink supply needle 24b is provided upright at the bottom. The large storage chamber 23a stores a first ink cartridge (not shown) filled with inks of three colors, such as red, blue, and yellow.
The small storage chamber 23b stores a second ink cartridge (not shown) filled with black ink.

As shown in FIG. 3, each of the ink supply needles 24a and 24b has a conical tip, and has a large number of ink guide holes 27 penetrating vertically on its inclined surface. I have. The ink guide hole 27 communicates with a first ink supply passage 28 extending vertically in the ink supply needles 24a and 24b. A second ink supply path 39 extending in the up-down direction and communicating with the first ink supply path 28 is formed in a portion of the cartridge case 20 corresponding to the ink supply needles 24a and 24b. Then, the inflow side of the second ink supply path 39 (the ink supply needle 24
The filter 38 that filters the ink supplied from the ink cartridge is provided on the side closer to a and 24b).

On the other hand, as shown in FIG. 4, on the lower surface of the cartridge case 20, four flow path forming plates 29 having a substantially oval trapezoidal shape are integrally formed.
The grooves 30 communicating with the second ink supply passages 39 are formed on the board surface of each of them. Then, the board surface of the flow path forming board 29 is placed on a plate (sealing plate) via a silicone adhesive (sealant) 36 that is unlikely to deteriorate or age due to ink.
31 seals the groove 30 into the channel 3
2 (see FIG. 3). The flow path 32 (groove 30)
Each extends toward the center of the cartridge case 20. Then, the ink of the flow path 32 is applied to the portion of the plate 31 corresponding to the vicinity of the front end of the flow path 32,
In the present embodiment, supply holes 33a and 33b for supplying ink to the plate 31 are formed in a direction perpendicular to the plate surface of the plate 31.

That is, one end of the groove 30 in the longitudinal direction is communicated with the ink cartridge via the second ink supply path 39, and the other end is communicated with the head main body 21 via at least one supply hole 33a. I have. Also, each groove 30
The ends on the side of the second ink supply path 39 are separated, and the ends on the side of the supply holes 33a extend toward the center of the cartridge case 20 and are arranged close to each other.

[0110] Here, the plate 31 is
The mounting structure of the device will be described in detail. Channel forming board 2
A plurality of (16 in the example shown in FIG. 4) welding pins 34 are vertically provided so as to surround the four grooves 30 on the lower surface of 9. The welding pins 34 are provided at a plurality of locations around the one groove 30 at the periphery thereof.

For example, as shown in FIG. 5 (a), seven welding pins 34 are provided around the leftmost groove 30-1 in the figure (in FIG. The corresponding groove 30 and welding pin 34 are painted out). Also, as shown in FIG. 5B, welding pins 34 are provided at four locations around the second groove 30-2 from the left in the figure. Similarly, as shown in FIGS. 5C and 5D, the third and fourth grooves 30 from the left in the figure are shown.
Welding pins 34 are provided at four and six locations around -3 and 30-4, respectively. in this way,
By providing the welding pins 34 at a plurality of locations around the one groove 30, rattling hardly occurs even when an external force is applied to the plate 31, and ink leakage and the like hardly occur.

On the other hand, a portion of the plate 31 corresponding to each welding pin 34 has an insertion hole 3 through which the welding pin 34 is inserted.
5 are drilled. Then, with the welding pins 34 inserted through the insertion holes 35 of the plate 31, the welding pins 34
The plate 31 is melted and crushed,
Are attached to the channel forming board 29 (see FIG. 2).

The recording head having the above configuration can be assembled, for example, as follows. That is, first,
The cartridge case 20 is fixed with the bottom surface facing upward, and a silicone adhesive 36 is applied around the groove 30 of the flow path forming board 29. Next, the plate 31 is connected to the channel forming plate 2.
9 and, as shown in FIG.
Through the insertion hole 35. Next, by pressing the tip of the welding pin 34 with the heated caulking pin 45, the tip of the welding pin 34 is melted and crushed. After that, the pressing of the caulking pin 45 is released and the plate is allowed to cool, so that the welding pin 34 solidifies and the plate 31 is attached to the channel forming board 29. In the figure, reference numeral 37 denotes a support rib for supporting the plate 31.

As described above, in the recording head 18, the portion for forming the flow path 32 of the recording head is formed by the flow path forming plate 29.
And two plate-like members of the plate 31,
The recording head 18 can be significantly reduced in size as compared with a conventional one in which a flow path is formed by oblique holes. Further, since the end of the groove 30 on the side of the head body 20 is arranged close to the head body 20, the size of the head body 20 can be significantly reduced regardless of the size of the ink cartridge. Furthermore, assembling is easy, automation is easy, and cost is low. In addition, since the flow path 32 is sealed with a sealant, dust and the like hardly enter the flow path 32.

In this embodiment, the flow path forming plate 29 is formed integrally with the lower surface of the cartridge case 20. However, the present invention is not limited to this. May be a separate member. For example, as shown in FIG. 7A, a flow path forming plate 29A that defines the bottom and side walls of the groove 30 is fixed to the lower surface of the cartridge case 20, and the opening of the groove 30 is sealed with the plate 31. You may do so. For example, as shown in FIG. 7B, a member 29 </ b> B having a penetrating portion defining the side wall of the groove 30 may be fixed to the cartridge case 20 to form the groove 30. The opening is sealed with the plate 31 in the same manner.

For example, as shown in FIG.
The flow path forming board 29 </ b> C may be provided as a separate member, and a silicone adhesive 36 may be provided around the opening of the groove 30 and sealed with the cartridge case 20. In this case, the cartridge case 20 serves as a sealing plate. Further, even in such a configuration, FIG.
As shown in FIG. 5, a member 29D having a through portion defining the side wall of the groove 30 and a member sealing one of the through portions and defining the bottom surface of the groove 30, for example, a plate 31, are separate members. These may be fixed to each other to form a channel forming board.

(Embodiment 2) FIG. 9 is a cross-sectional view illustrating a seal portion between a flow path forming board and a plate according to Embodiment 2.

Embodiment 2 is another example of the joint structure between the flow path forming board 29 and the plate 31. The structure of the other parts is as follows.
This is the same as in the first embodiment. Hereinafter, the sealing portion between the flow path forming board 29 and the plate 31 will be described in detail.

As shown in FIG. 9, in the present embodiment, the grooves 30 are formed on the board surface (the lower face in the figure) of the flow path forming board 29.
, That is, the surface of the partition wall around the groove 30 facing the sealing plate is an inclined surface 48 that is inclined (downward inclined) so as to gradually decrease toward the groove 30. In addition, the peripheral surface of the flow path forming plate 29, that is, the inclined surface 4 of the partition wall of the groove 30.
On the outer side of 8, there is provided a step 49 forming a concave portion to which the silicone adhesive 36 is applied. Furthermore, step 4
A flat portion 51 is provided in a portion between the flat surface 9 and the inclined surface 48. Then, a corner formed by the step 49 and the flat portion 51 is removed, and a chamfered surface 50 is formed.

It is preferable that the inclination of the inclined surface 48 is set to 5/1000 or more and 200/1000 or less. If the gradient is less than 5/1000, the gap between the inclined surface 48 formed when the board surface of the flow path forming board 29 is sealed with the plate 31 is too small to hold the silicone adhesive 36 sufficiently. Silicone adhesive 3 in flow path 32
This is because, when the thickness exceeds 200/1000, the gap at the inclined surface 48 is too large, and large bubbles adhere to the silicone adhesive 36.

The recording head of this embodiment can be assembled, for example, as follows. That is, first, as shown in FIG. 10A, the cartridge case 20 is fixed with the bottom surface facing upward, and the silicone adhesive 36 is applied to the step 49 provided on the partition wall of the groove 30. . As described above, since the silicone adhesive 36 is applied to the portion of the step 49, the amount of the adhesive that substantially contributes to the adhesion can be reduced, and it is necessary to perform fine control such as minute application and application speed. And the application amount is easily controlled.

Next, the plate 31 is positioned on the flow path forming board 29, and as shown in FIG. 10B, the plate 31 is placed on the board surface of the flow path forming board 29, and as shown in FIG.
As shown in (a), each welding pin 34 of the cartridge case 20 is inserted into the insertion hole 35 of the plate 31. Next, by pressing the tip of the welding pin 34 with the heated caulking pin 45, the tip of the welding pin 34 is melted and crushed as shown in FIG. Fixed to.

At this time, as shown in FIG. 10C, the silicone adhesive 36 applied to the step 49 is spread from the flat portion 51 to the inclined surface 48, and the groove 30 is formed.
Are sealed to form the flow path 32. At this time, a chamfered surface 50 is formed at a corner formed by the step 49 and the flat portion 51.
Is formed, the silicone adhesive 36 applied to the step 49 is pressed by the plate 31 and
1, the silicone adhesive 36 is chamfered 5
Since it is accumulated at 0 and does not go to the flat portion 51 more than necessary, it is difficult for the silicone adhesive 36 to protrude into the flow path 32.

As described above, the recording head 18 according to the present embodiment is
In the embodiment, as in the first embodiment, since the portion of the recording head where the flow path 32 is formed is composed of the disk-shaped flow path forming plate 29 and the plate 31, the recording head can be reduced in size and easily. Can be assembled and low cost.
Furthermore, since the surface of the partition wall around the groove 30 of the flow path forming plate 29 facing the sealing plate is an inclined surface 48 that is inclined so as to gradually decrease toward the groove 30, the plate surface becomes the plate 31. A small gap is formed in the portion of the inclined surface 48 in a state where the silicone adhesive 36 is sealed, and the silicone adhesive 36 is held in the gap, so that the silicone adhesive 36 does not easily protrude into the flow path 32.

In the present embodiment, the chamfered surface 50 is formed by removing the corner formed by the step 49 and the flat portion 51. However, the present invention is not limited to this, and a radius may be provided. In these cases, the same operation and effect can be obtained.

(Embodiment 3) FIG. 11 is an enlarged sectional view of a main part for explaining a flow path forming board and a plate according to a third embodiment, and FIG. 12 is a plan view and a sectional view of a main part of the plate.

The third embodiment is another example of the supply port for communicating the flow path 32 with the head main body.
Is the same as That is, on the board surface of the flow path forming board 29,
The surface of the partition surrounding the groove 30 facing the sealing plate is the groove 30.
The inclined surface 48 is inclined so as to gradually decrease toward the center. A step 49 is formed outside the inclined surface 48 of the partition wall of the groove 30 to form a concave portion to which the silicone adhesive 36 is applied.

Then, as shown in FIG. 11, the supply holes 33a (see FIG. 3) of the plate 31 corresponding to the leading ends of the flow paths 32 are formed so that adjacent supply holes 33a form an inverted C-shape. It penetrates obliquely with respect to the plate surface of the plate 31. Thus, the opening pitch (P2 in the drawing) of the adjacent supply holes 33a on the flow path 32 side is longer than the opening pitch (P1 in the drawing) on the head body 21 side. As shown in FIGS. 12A and 12C, the supply hole 33a has a circular opening shape in plan view and bottom view. Therefore, as shown in FIG.
When viewed from the direction in which 3a penetrates (arrow C shown in FIG. 12B), the supply hole 33a has an elliptical shape. Further, a step-down portion 25 having an elliptical shape in a plan view is formed on the periphery of the opening of the supply hole 33a of the plate 31. Note that the depth of the step-down portion 25 is set to about 10 to 30 μm. Further, the supply hole 3 at a position away from the tip of the flow path 32
3b is formed in a direction perpendicular to the plate surface of the plate 31 (see FIG. 3).

The width dimension D of the flow path forming board 29 is
It is preferable to set the distance to 1.0 mm or more over the entire circumference around 0. If the width D is less than 1.0 mm, the sealing may be insufficient or the sealant may protrude into the flow path 32. Note that the width dimension D is practically set to about 2.0 mm in order to avoid an increase in the size of the recording head 18.

Next, a method for manufacturing the recording head 18 of the present embodiment will be described.

The plate 31 used in the recording head 18 of this embodiment is formed by, for example, integral molding such as injection molding. In this integrated molding of the mold, the supply hole 33a penetrating through the plate 31 is formed using a punching pin (supply hole forming pin) 70 as shown in FIG.

The punching pin 70 is formed by subjecting a tip of a pin having a circular cross section to a predetermined processing. That is, in a state where the punching pin 70 is arranged at an angle (α in the drawing) through which the supply hole 33a passes, a predetermined length (L in the drawing) from the tip.
Are formed in an elliptical cross section (FIG. 13).
(C)). As a result, the tip end surface of the punch pin 70 that comes into contact with the mold surface is formed to be circular (FIG. 1).
3 (b)). In addition, the length dimension L of the processed portion is
The thickness of the plate 31 is set to be slightly shorter than the plate thickness, and a portion closer to the root than the plate 31 is formed to have a large diameter.

As shown in FIG. 14A, the punch pin 70 is used together with dies 72a and 72b having a molding space 71 in which the plate 31 is molded. A slide hole 73 is formed in the first mold 72a at an angle α at which the supply hole 33a penetrates the mold surface, and a punch pin 70 is slidably inserted into the slide hole 73. In this state, the tip surface of the punch pin 70 comes into contact with the mold surface of the second mold 72b (the surface corresponding to the plate surface of the plate 31).

The plate 31 is provided with the molds 72a, 72
It can be made as follows using b and the punch pin 70. That is, first, as shown in FIG. 14A, the first die 72a and the second die 72b are clamped in a state where the punch pin 70 is set in the first die 72a.
Next, as shown in FIG. 14B, the molding resin 71 is filled in the molding space 71 and cooled and solidified. Then, FIG.
As shown in FIG. 4 (c), the removal pin 70 is slid in the root direction and removed from the molded product. Then, the first mold 72
a and the second mold 72b are opened up and down. Thus, the plate 31 is obtained. Then, traces from which the punch pin 70 has come off are formed in the supply holes 33a.

At this time, since the shape of the tip end surface which comes into contact with the die surface of the punch pin 70 is formed in a circular shape, the supply hole 33 is formed.
The opening shape of a is also formed in a circular shape. Also, the punch pin 70
Since the length dimension L of the front end processed portion is slightly shorter than the plate thickness of the plate 31, and the portion close to the die surface of the first die 72a is formed with a large diameter, the supply hole 33a of the plate 31 is formed. A step-down portion 25 is formed around the opening.

Then, the cartridge case 20 is fixed with the bottom face upward, and the step 4 around the peripheral edge of the flow path forming plate 29 is fixed.
A silicone adhesive 36 is applied to the portion 9. Then, the plate 31 is positioned on the flow path forming board 29, the plate 31 is placed on the surface of the flow path forming board 29, and the welding pins 34 of the cartridge case 20 are inserted into the insertion holes 35 of the plate 31. Let it. Next, the plate 31 is fixed to the flow path forming board 29 by melting and crushing the tip of the welding pin 34 by pressing the tip of the welding pin 34 with a heated caulking pin.

According to the above manufacturing method, the recording head 18 can be easily obtained at low cost. In addition, since the opening of the supply hole 33a of the obtained plate 31 is formed in a circular shape, the manufacturing cost does not increase, the sealing performance does not decrease, and the number of bubbles is reduced. That is, when the ink supply hole penetrating obliquely is formed by a pin having a normal circular shape in cross section, the shape of the opening becomes elliptical, but the supply hole 33 of the plate 31 obtained by the above manufacturing method.
Since the opening shape of “a” is circular, it is not necessary to make the opening shape of the ink supply pipe 16 of the head main body 21 and the packing or the like of this portion elliptical, and it is possible to secure good sealing properties at low cost and to obtain air bubbles. There is also little snagging.

Further, by setting the length L of the processed end portion of the punch pin 70 to be slightly shorter than the thickness of the plate 31, a portion close to the die surface of the first die 72a is formed to have a large diameter. Since the stepped portion 25 is formed on the periphery of the opening of the supply hole 33a of the plate 31, even if there is a slight problem in processing accuracy or the like, a projection is almost always formed on the periphery of the opening of the supply hole 33a. Disappears and exhibits good sealing properties.

(Other Embodiments) In the above embodiments, the silicone adhesive 36 was used as the sealant. However, the present invention is not limited to this.
Thermoplastic resin adhesive mainly composed of acrylic resin or vinyl resin, thermosetting resin adhesive mainly composed of phenolic resin or epoxy resin, natural rubber or various synthetic rubbers Various materials such as a rubber-based adhesive can be used.

In these cases, the same operation and effect as those of the above embodiment can be obtained. In addition, if the adhesive has a good sealing property and a good adhesive property, it can be fixed with only the adhesive without welding the flow path forming plate and the sealing plate as described above.

[0141]

As described above, according to the ink jet recording head of the present invention, the portion forming the flow path of the recording head is composed of two disc-shaped members. The recording head can be significantly reduced in size as compared with the formed one. Further, since the sealing plate is welded to the flow path forming plate via the sealant, dust and the like hardly enter the flow path. In addition, it is relatively easy to assemble without oblique holes requiring complicated processing, so that the cost is low.

In the ink jet recording head of the present invention, when the sealing plate is attached to the flow path forming plate, the welding pin protruding from the flow path forming plate is inserted into the insertion hole of the sealing plate and melted. In this case, assembly is easy, automation is easy, cost can be reduced, finer scum is less likely to occur compared to ultrasonic welding, and dust is mixed in the flow path. Less.

In the ink jet recording head of the present invention, when the welding pin is formed in a portion surrounding the groove of the flow path forming plate, or when the welding pin is formed at three or more places around the groove of the flow path forming plate. In this case, even when an external force is applied to the sealing plate, the mounting between the sealing plate and the flow path forming plate is less likely to rattle, and ink leakage and the like are less likely to occur.

The ink jet recording head of the present invention is provided with a filter for filtering the ink supplied from the ink tank. This is extremely effective because dust and the like do not enter the flow path in which dust and the like are not allowed to enter.

In the ink jet recording head of the present invention, when the sealant is made of a silicone resin, the sealant hardly deteriorates or ages due to the ink, and ink leakage hardly occurs.

Furthermore, according to the ink jet recording head of the present invention, the surface of the partition wall surrounding the groove on the board surface facing the sealing plate is an inclined surface that is gradually inclined toward the groove. Therefore, a slight gap is formed at the inclined surface in a state where the board surface is sealed with the sealing plate, and the sealant is held in the gap, so that the sealant does not easily protrude into the flow path. Therefore, unlike the related art, the sealant hardly protrudes into the flow path, and troubles such as defective ejection due to air bubbles adhering to the sealant are also prevented.

In the case of the ink jet recording head of the present invention, when a step is formed outside the inclined surface of the partition wall of the groove to form a concave portion to which the sealant is applied, the sealant is applied to the step. Work becomes easier. In other words, in order to prevent the sealant from protruding, the amount of the sealant to be applied may be reduced, but if the amount of the sealant is excessively reduced, the control of the application becomes difficult,
In the worst case, the sealant is interrupted, resulting in poor sealing. As described above, by applying the sealant to the steps, the amount of the sealant substantially contributing to the seal when sealed with the sealing plate can be reduced. Therefore, even if the applied amount of the sealing agent is not unnecessarily reduced, the protrusion of the sealing agent can be effectively prevented, the control of the applied amount becomes easy, and the sealing failure does not occur.

In the ink jet recording head of the present invention, when the slope of the inclined surface is set to 5/1000 or more and 200/1000 or less, the head is formed with the board surface sealed with a sealing plate. Even if the gap between the sloped parts is sufficiently small and bubbles adhere to the sealant,
Since it is extremely small, bubbles hardly come off from the sealant, and the occurrence of troubles such as poor discharge is prevented.

In the ink jet recording head of the present invention, when a flat portion is provided between the inclined surface of the channel forming plate and the step, the sealing effect between the channel forming plate and the sealing plate is provided. Is not reduced.

In the ink jet recording head of the present invention, when the angle between the step and the flat portion has been removed, the sealing agent applied to the step is pressed by the sealing plate to move toward the flat portion. When the sealing agent is extended, the sealing agent accumulates in the removed corner portions and does not go to the flat portion more than necessary, so that the effect of preventing the sealing agent from protruding is further improved.

Further, according to the ink jet recording head of the present invention, the opening pitch of the ink supply hole on the head main body side is made to match the pitch of the ink supply pipe of the head main body by obliquely penetrating the ink supply port. However, the opening pitch of the ink supply holes on the flow path side is wider than that. Therefore, it is possible to allow a sufficient dimension, and it is possible to sufficiently secure the width of the flow path forming plate at a portion corresponding to the ink supply hole of the flow path forming plate. Although a sealant is applied to fix the sealing plate to the board surface, if the sealant protrudes into the flow path, problems such as sticking of air bubbles occur. Therefore, it was necessary to separate the application portion of the sealant from the flow path. As a result, unlike the conventional case, the sealing is not sufficiently performed, and the sealing agent hardly protrudes into the flow path, and the occurrence of troubles such as a discharge failure due to air bubbles adhering to the sealing agent can be prevented.

In the ink jet recording head of the present invention, if the width of the flow path forming plate around the groove is set to 1.0 mm or more over the entire circumference, the seal may be insufficient or the seal may be insufficient. The agent does not protrude into the flow path, and the occurrence of troubles such as ejection failure due to air bubbles adhering to the sealant can be reliably prevented.

The method for manufacturing an ink jet recording head of the present invention can easily obtain the ink jet recording head of the present invention at low cost.

In the ink jet recording head of the present invention, when the opening of the ink supply hole on the head main body side is formed in a circular shape, and in the method of manufacturing the ink jet recording head of the present invention, In the case where the shape of the cross section parallel to the mold surface corresponding to the plate surface of the sealing plate is circular, the opening shape of the ink supply hole is simple, and the manufacturing cost does not increase. In addition, the sealing performance is not reduced, and the trapping of air bubbles is also reduced.

That is, when the ink supply hole penetrating obliquely is formed by a pin having a normal circular cross section, the shape of the opening of the ink supply hole becomes elliptical. For this reason, the opening of the ink supply tube of the head main body must be formed in an elliptical shape in accordance with the opening, and it is necessary to use an elliptical packing or the like in this portion. As described above, since other members must be prepared in an elliptical shape, the manufacturing cost as a whole becomes extremely high, and the sealing performance is reduced and bubbles may be trapped. In the present invention, since the opening of the ink supply hole of the sealing plate is circular, the above-mentioned problems are solved, low cost, good sealing performance is obtained, and bubbles are hardly caught.

In the ink jet recording head of the present invention, when a stepped portion is formed around the opening of the ink supply hole of the sealing plate, and in the method of manufacturing the ink jet recording head of the present invention, In the case where a portion having a portion shorter than the thickness of the sealing plate in the vicinity of the tip is formed so that the shape of a cross section parallel to the mold surface corresponding to the plate surface of the sealing plate is circular as the forming pin In this case, the sealing performance of the ink supply hole opening is hardly reduced.

That is, when an ink supply hole having a circular opening shape and penetrating obliquely is formed, a pin obtained by processing a tip portion of a normal circular cross section pin into an elliptical cross section shape is used. At this time, if the length dimension of the processed portion and the dimension of the molding space corresponding to the thickness of the sealing plate match, no problem occurs, but the length dimension of the processed portion depends on processing accuracy and tolerance. When the thickness is longer than the thickness of the sealing plate, a convex portion is formed on the periphery of the opening of the ink supply hole. Therefore, a gap is generated between the sealing plate and the board surface. For this reason, there is a possibility that the sealing performance of this portion is reduced.

In the present invention, since a step-down portion is formed on the periphery of the opening of the ink supply hole of the sealing plate, even if there is a slight problem in processing accuracy or the like, a projection is formed on the periphery of the opening of the ink supply hole. Almost no formation occurs, and good sealing properties can be ensured.

[Brief description of the drawings]

FIG. 1 is a perspective view illustrating an ink jet recording head according to a first embodiment of the present invention.

FIG. 2 is a perspective view of the ink jet recording head according to the first embodiment of the present invention as viewed obliquely from below.

FIG. 3 is a cross-sectional view illustrating a main part of the ink jet recording head according to the first embodiment of the present invention.

4A and 4B are diagrams illustrating a structure of an ink jet recording head according to the first embodiment of the present invention, wherein FIG. 4A is a bottom view of a cartridge case, and FIG.

FIG. 5 is a bottom view of the cartridge case illustrating a mounting structure between the flow path forming board and the plate according to the first embodiment of the present invention.

6A and 6B are diagrams illustrating an assembled state of the ink jet recording head according to the first embodiment of the present invention, wherein FIG. 6A is a cross-sectional view of a main part before swaging, and FIG. 6B is a cross-sectional view of a main part after swaging. is there.

FIG. 7 is a sectional view showing another example of the ink jet recording head according to the first embodiment of the present invention.

FIG. 8 is a sectional view showing another example of the ink jet recording head according to the first embodiment of the present invention.

9A and 9B are diagrams illustrating a seal portion between a flow path forming plate and a plate according to a second embodiment of the present invention, wherein FIG. 9A is a cross-sectional view of a main part of the flow path forming plate, and FIG. It is an expanded sectional view of the part enclosed with.

FIG. 10 is a cross-sectional view illustrating an assembled state of an ink jet recording head according to Embodiment 2 of the present invention.

FIG. 11 is a cross-sectional view illustrating a main part of an ink jet recording head according to a third embodiment of the invention.

12A and 12B are diagrams illustrating a plate according to a third embodiment of the present invention, wherein FIG. 12A is a plan view, FIG. 12B is a cross-sectional view, and FIG.
FIG. 4D is a bottom view, as viewed from the direction of arrow C.

13A and 13B are diagrams illustrating a punch pin, in which FIG. 13A is a side view, FIG. 13B is a bottom view, and FIG. 13C is a diagram viewed from the direction of arrow E.

14A and 14B are diagrams illustrating a manufacturing process of the ink jet recording head according to the third embodiment of the present invention, wherein FIG. 14A illustrates a state in which the mold is clamped, FIG. 14B illustrates a state in which the mold is being formed, and FIG. It is sectional drawing which shows a state after.

FIG. 15 is a sectional view showing a conventional ink jet recording head.

FIG. 16 is a sectional view showing a conventional ink jet recording head.

17A and 17B are diagrams showing a conventional ink jet recording head, wherein FIG. 17A is a sectional view showing a main part, and FIG. 17B is a plan view of an ink supply needle.

[Explanation of symbols]

 29 flow path forming board 30 groove 31 plate 32 flow path 33a supply hole 36 silicone adhesive 48 inclined surface

──────────────────────────────────────────────────続 き Continued on the front page (31) Priority claim number Japanese Patent Application No. Hei 11-372105 (32) Priority date December 28, 1999 (December 28, 1999) (33) Priority claim country Japan (JP) (56) References JP-A-10-166608 (JP, A) JP-A-8-39826 (JP, A) JP-A-6-21937 (JP, U) WO 95/31335 (WO, A1) (58) ) Surveyed field (Int.Cl. ⁷ , DB name) B41J 2/16 B41J 2/175

Claims (43)

(57) [Claims] 1. An ink jet recording head comprising : a head body for discharging ink; and a flow channel for guiding ink supplied from an ink tank to the head main body, wherein a groove for forming the flow channel is provided. has a flow path forming plate held member integrally formed for holding said ink tank, and a sealing plate for sealing an opening of the groove is fixed to the flow path forming plate, sealing The plate is placed on the flow path forming plate with a sealant
Between the sealing plate and the flow path forming plate.
An ink jet type recording head having a support rib for defining a distance between persons . 2. The method according to claim 1, wherein the welding of the sealing plate to the flow path forming plate is performed by welding a welding pin protruding from the flow path forming plate through an insertion hole of the sealing plate. An ink jet recording head characterized by being deformed. 3. An ink jet recording head according to claim 2, wherein said welding pin is formed in a portion surrounding a groove of said flow path forming board. 4. The method of claim 3, wherein the welding pin, an ink jet recording head is characterized in that it is formed more places around the groove of the flow channel forming plate. 5. The head according to claim 1, further comprising a filter for filtering the ink supplied from the ink tank, wherein the flow path guides the ink passing through the filter to the head main body. An ink jet recording head characterized by the following. 6. Head body that discharges ink and ink
A flow for guiding the ink supplied from the tank to the head body
And an ink jet recording head having a
A groove for forming the flow channel is provided to hold the ink tank.
A flow path forming plate formed integrally with the holding member to be formed;
The opening of the groove is fixed to the road forming board via a sealant.
And a sealing plate for sealing the channel, the groove of the flow path forming board
The surface of the surrounding partition wall facing the sealing plate is the channel forming plate.
And the distance between the sealing plate and the sealing plate gradually increases toward the groove side.
The inclined surface is inclined so that the flow path is formed.
Outside the inclined surface of the board, a concave to which the sealant is applied
Characterized in that a step forming a portion is provided.
Ink jet recording head. 7. The ink jet recording head according to claim 6, wherein the slope of the inclined surface is set to be not less than 5/1000 and not more than 200/1000. 8. The system of claim 6 or 7, an ink jet recording head, wherein a flat portion is provided between the inclined surface and the step of the flow channel forming plate. 9. An ink jet recording head according to claim 8, wherein a corner formed by said step and said flat portion is removed. 10. A head main body for discharging ink,
Guides the ink supplied from the ink tank to the head body
An ink jet recording head having a flow path,
A groove forming the flow path is provided to hold the ink tank.
A flow path forming plate integrally formed with a holding member to hold,
Sealing which is fixed to the channel forming board and seals the opening of the groove
A plate, and an ink supply hole for supplying the ink in the flow path to the head main body is formed in the sealing plate, and the ink supply hole is inclined with respect to a plate surface of the sealing plate. An ink jet recording head, wherein the opening pitch of the ink supply holes is longer on the flow path side than on the head main body side by being penetrated. 11. The sealing plate according to claim 10, wherein
Peripheral portion of the groove defining the groove by being attached
An ink jet recording head, wherein the width dimension is set to 1.0 mm or more over the entire circumference. 12. The method according to claim 10 or 11, wherein the head main body side of the opening of the ink supply hole, an ink jet recording head is characterized in that it is formed in a circular shape. 13. The method according to claim 10, wherein
An ink jet recording head, wherein a stepped portion is formed around the opening of the ink supply hole of the sealing plate. 14. An ink jet recording head comprising: a head main body for discharging ink; and a flow path for guiding ink supplied from an ink tank to the head main body.
And the flow path flow path forming plate having a groove to be formed is provided and is fixed via the sealant flow path forming plate and a sealing plate for sealing an opening of the groove, the flow Of the groove of the road forming board
The surface of the surrounding partition wall facing the sealing plate is the channel forming plate.
And the gap between the sealing plate and the sealing plate gradually widens toward the groove side.
The inclined surface is inclined so that the flow path is formed.
The sealant is applied to the outside of the inclined surface of the partition wall of the board.
An ink jet recording head, comprising a step for forming a concave portion to be clothed . 15. An ink jet recording head according to claim 14, wherein the slope of said inclined surface is set to be not less than 5/1000 and not more than 200/1000. 16. An ink jet recording head according to claim 14, wherein a flat portion is provided between the inclined surface of said holding member and a step. 17. An ink jet recording head according to claim 16, wherein a corner formed by said step and said flat portion is removed. 18. An ink jet recording head comprising: a head main body for discharging ink; and a flow channel for guiding ink supplied from an ink tank to the head main body,
A flow path forming plate provided with a groove for forming the flow path, and a sealing plate fixed to the flow path forming plate and sealing an opening of the groove, the sealing plate, An ink supply hole for supplying the ink in the flow path to the head main body is formed, and the ink supply hole is obliquely penetrated with respect to the plate surface of the sealing plate. Wherein the length of the ink jet recording head is longer on the flow path side than on the head body side. 19. The method according to claim 18, wherein the sealing plate and the sealing plate are fixed.
A peripheral portion of the groove that defines the groove when worn
An ink jet recording head, wherein the width dimension is set to 1.0 mm or more over the entire circumference. 20. The ink jet recording head according to claim 18, wherein the opening of the ink supply hole on the head main body side is formed in a circular shape. 21. The method according to claim 18, wherein
An ink jet recording head, wherein a stepped portion is formed around the opening of the ink supply hole of the sealing plate. 22. The method according to claim 18, wherein
An ink jet recording head, wherein a sealant is provided at least around the groove between the flow path forming board and the sealing plate. 23. An ink jet recording head according to claim 22, wherein said flow path forming board and said sealing plate are fixed via said sealant. 24. An ink jet recording head according to claim 22, wherein said sealant is made of a silicone resin. 25. An ink jet recording head comprising: a head main body for discharging ink; and a flow path for guiding ink supplied from an ink tank to the head main body,
And the flow path flow path forming plate having a groove to be formed is provided and is fixed to the flow path forming plate and a sealing plate for sealing an opening of the groove, the sealing plate is the flow Via sealant on road forming board
Between the sealing plate and the flow path forming plate.
An ink jet type recording head having a support rib for defining a distance between persons . 26. The method according to claim 25, wherein the welding of the sealing plate to the flow path forming plate is performed by welding a welding pin protruding from the flow path forming plate through an insertion hole of the sealing plate. An ink jet recording head characterized by being deformed. 27. An ink jet recording head according to claim 26, wherein said welding pin is formed in a portion surrounding a groove of said flow path forming board. 28. An ink jet recording head according to claim 27, wherein said welding pins are formed at a plurality of positions around a groove of said flow path forming board. 29. The method according to claim 25, wherein
An ink jet recording head, comprising: a filter for filtering the ink supplied from the ink tank, wherein the flow path guides the ink passing through the filter to the head main body. 30. The method according to claim 25, wherein
An ink jet recording head, wherein the sealing agent is made of a silicone resin. 31. The method according to claim 14, wherein
The ink jet recording head according to claim 1, wherein the flow path forming board is formed integrally with a holding member for holding the ink tank, and a member joined to the holding member serves as the sealing plate. 32. The method according to claim 14, wherein
An ink jet recording head according to claim 1, wherein the flow path forming board in which the groove is formed is a separate member from a holding member that holds the ink tank. 33. The apparatus according to claim 32, wherein the separate member is
An ink jet recording head, wherein a bottom portion and a side wall of the groove are defined. 34. The apparatus according to claim 32, wherein the separate member is
An ink jet recording head having a through portion defining a side wall of the groove. 35. The groove according to claim 1, wherein one end of the groove in the longitudinal direction is communicated with the ink tank, and the other end is communicated with the head main body. Ink jet recording head. 36. An ink-jet recording head according to claim 35, wherein said groove is arranged such that said one end side is separated and said other end side is close to each other. 37. An ink jet recording head according to claim 36, wherein said grooves are provided corresponding to the types of ink ejected from said head body. 38. A head body for discharging ink, a flow path forming plate provided with a groove for forming a flow path for guiding ink supplied from an ink tank to the head body, and a sealant on the flow path forming plate. A sealing plate that is fixed through the opening and seals the opening of the groove, and the sealing plate is provided with an ink supply hole that supplies the ink in the flow path to the head body, An ink jet recording head in which the ink supply holes are obliquely penetrated with respect to the plate surface of the sealing plate, so that an opening pitch of the ink supply holes is longer on the flow path side than on the head main body side. In the manufacturing method, in the molding space of a mold having a molding space for molding a sealing plate, a supply hole forming pin is disposed obliquely to a mold surface corresponding to a plate surface of the sealing plate, After filling and solidifying the molding material in the molding space, Method of manufacturing the ink jet recording head is characterized in that so as to form the ink supply hole by removing the supply hole forming pins. 39. The method according to claim 38, wherein the supply hole forming pin is a pin having a circular shape at a tip end surface which comes into contact with a mold surface corresponding to a plate surface of the sealing plate. A method for manufacturing an ink jet recording head, which is characterized by the following. 40. The pin according to claim 39, wherein the supply hole forming pin has a large diameter at a portion close to a mold surface corresponding to another plate surface of the sealing plate. A method for manufacturing an ink jet recording head. 41. A head body for discharging ink, a flow path forming plate provided with a groove for forming a flow path for guiding ink supplied from an ink tank to the head body, and an opening of the groove is sealed. And a sealing plate to be applied, a sealant is applied around a groove of the flow path forming plate, and then the sealing plate is welded to the flow path forming plate. A method for manufacturing an ink jet recording head, comprising: fixing the sealing plate and the flow path forming substrate in a state where a sealant is held around the groove. 42. An insertion hole according to claim 41, wherein said flow path forming substrate has welding pins protrudingly contacting with a joint surface side with said sealing plate, and said sealing plate is inserted with said welding pins. Having, the welding of the sealing plate to the flow path forming board,
A method for manufacturing an ink jet recording head, wherein the welding pin is inserted into an insertion hole of the sealing plate and melted and deformed. 43. The method according to claim 41, wherein said sealant is made of a silicone resin.