JP4341271B2 - Liquid jet head - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method of manufacturing a liquid ejecting head that ejects liquid by supplying a liquid to a liquid ejecting unit through a liquid supply needle from a liquid storage means such as a liquid container, and a liquid ejecting head manufactured by the same manufacturing method, and The present invention relates to a manufacturing mold.
[0002]
[Prior art]
Liquid ejecting heads that eject liquid from nozzle openings are known for various liquids, and a typical example is an ink ejecting unit that is mounted on an ink jet recording apparatus. Can do. Therefore, the prior art will be described taking the ink jet recording apparatus as an example.
[0003]
In the conventional recording apparatus, the ink of the ink cartridge is supplied to the ink ejecting section through the hollow ink supply needle attached to the flow path forming member. FIG. 11 is a plan view, a bottom view, and a sectional view of an ink supply needle employed in a conventional ink jet head. The hollow ink supply needle 80 is composed of a straight pipe part 81, a pointed part 82 composed of the entire conical part provided at the tip thereof, and a diameter-enlarged part 83 in which the inner diameter of the straight pipe part 81 is gradually increased. In addition, a plurality of ink through holes 84 opened in the pointed portion 82 are opened in the inner end surfaces 85A and 85B of the straight tube portion 81 which are multistage.
[0004]
The inner end surface 85 </ b> A is a surface like a ceiling surface of a recess, and is a flat circular surface concentric with the straight pipe portion 81. The inner end surface 85B is an annular flat surface that is concentric with the same surface 85A outside the inner end surface 85A, and is stepped from the inner end surface 85A. The reason why the multi-stage structure is formed in this manner is that the ink passage hole 84 becomes longer and the flow path resistance becomes higher in the portion close to the axial center of the straight pipe portion 81, so that the inner end face 85A is formed as described above to form the axial center. The length of the ink passage hole 84 on the side is made as short as possible. A filter 86 is disposed at the opening end of the enlarged diameter portion 83.
[0005]
A boundary portion between the straight cylindrical inner surface of the straight pipe portion 81 and the substantially tapered inner surface of the enlarged diameter portion 83 that gradually increases in diameter is indicated by reference numeral 87. The ink supply needle 80 is manufactured by injection molding using a synthetic resin such as polypropylene or polyethylene.
[0006]
[Patent Document 1]
JP-A-9-314862
[0007]
[Problems to be solved by the invention]
The ink through hole 84 is a straight and long flow path having a circular cross section, and has such a flow path configuration in order to hold ink in the ink supply needle 80. However, in order to reduce the flow resistance of ink in the flow path and perform smooth ink supply, the shape of the passage such as the ink through hole 84 is not desirable. On the other hand, this type of ink supply needle 80 is generally manufactured by injection molding with a synthetic resin. However, a mold for molding an elongated channel such as the ink through hole 84 has a very fine structure. . That is, the ink through hole 84 is formed by arranging an elongated pin that functions as a core in the mold cavity.
[0008]
Therefore, there is a problem that it is difficult to improve the strength and durability of the mold because the flow resistance in the ink through hole 84 is large and the mold has a fine structure. Furthermore, improvement of the mold structure is also desired from the viewpoint of improving the molding quality by increasing the molding pressure of the molten resin.
[0009]
The present invention has been made in view of such circumstances, and an object of the present invention is to manufacture a liquid jet head that reduces the flow path resistance of the liquid supply needle and improves the strength and durability of the molding die. The present invention provides a method, a liquid jet head manufactured by the manufacturing method, and a manufacturing mold.
[0010]
[Means for Solving the Problems]
In order to achieve the above object, a method of manufacturing a liquid ejecting head according to the present invention includes a flow path forming member to which a liquid ejecting section that ejects the liquid supplied from the liquid storage means is attached, and the flow path forming member. A method of manufacturing a liquid jet head that includes a liquid supply needle that receives a supply of liquid from the liquid storage means and has a circular cross-section with a liquid through-hole at the tip of the liquid storage means, and a hollow liquid supply needle, The mold for molding the liquid supply needle is composed of a female mold and a male mold that match with each other in a predetermined positional relationship, and a step is arranged concentrically with a small diameter on the apex side at a site where the apex of the male mold is molded. A multi-stage structure portion is provided, and a through-hole molding member that molds the liquid through-hole is provided at a site where the tip of the female mold is molded, and the through-hole molding member is substantially axially centered from the inner surface of the female mold. Are arranged in a protruding state toward the And summarized in that injecting the molding material into the mold contact surface formed on the member kept in contact with each stage of the multistage structure of the male.
[0011]
That is, the mold for molding the liquid supply needle is composed of a female mold and a male mold that match with each other in a predetermined positional relationship, and the cusp portion of the male mold is concentrically stepped with a small diameter on the side where the cusp is molded. An arranged multistage structure portion is provided, and a through-hole molding member for molding the liquid through-hole is provided at a site where the tip of the female die is molded, and the through-hole molding member is formed from the inner surface of the female die. The molding material is injected into the mold in a state in which the contact surface formed on the through-hole molding member is in contact with each stage of the male multistage structure portion, and is arranged in a state of projecting substantially toward the axial center. It is a manufacturing method.
[0012]
For this reason, since the molding material in the molten state does not flow into the surface abutting portion of the contact surface, a liquid through hole is formed at the location of the contact surface. Such contact is made at a plurality of concentric locations between the male multi-stage structure and the female through-hole molding member, so that the molded liquid through-holes are concentric at the apex. Arranged and a required flow path area is ensured at a predetermined through hole position. In addition, it is a type in which the high-rigidity part of the female part and the male part are in direct contact with each other without adopting a fine structure like the above-described core pin. Can be improved and simplified. Due to such rigidity improvement, a molding material such as a molten resin can be injected at a high pressure, so that the molding material flows into every corner of the detailed structure of the apex, so that a short-circuit portion due to lack of hot water does not occur. In addition, since the flow rate of the molding material is improved, the temperature drop of the molding material is reduced as much as possible, and the fused state in the weld line is improved. Further, since the liquid through hole formed in this way has a form without a passage length, the flow passage resistance of the liquid accompanying the passage length can be minimized at the apex of the liquid supply needle.
[0013]
In addition, when the liquid supply needle is bonded to the flow path forming member by ultrasonic bonding, ultrasonic vibration is transmitted to each part of the liquid supply needle. Excessive stress does not act on the fine structure part. Furthermore, since the weld line existing there also has good fusing property, the melting phenomenon due to the “slip movement” at the position of the line can be avoided.
[0014]
In the method of manufacturing a liquid jet head according to the aspect of the invention, when the through hole forming member is a plate-like member, the member protruded from the inner surface of the female die is integrated with the female die under high rigidity. As a result, the durability of the mold can be increased. Further, since it is a plate-like member, it functions as a guide plate for the flow of the molding material, and an orderly material flow can be formed toward the tip of the apex.
[0015]
In the method of manufacturing a liquid jet head according to the aspect of the invention, when the contact surface where the plate-shaped member contacts a part of the male mold is a surface portion formed on the surface in the thickness direction of the plate-shaped member, the contact Surface formation can be secured with a simplified structure. Further, the surface portion can be easily selected by selecting the shape of the end surface of the plate-like member on the axial center side, so that accurate surface contact with the male multi-stage structure portion can be ensured, and the liquid The through hole can be molded normally.
[0016]
In the method of manufacturing a liquid jet head according to the aspect of the invention, the contact surface may be a multi-contact surface that is arranged plurally on a single plate-like member at a fixed interval or a single-contact surface that is arranged on one plate-like member. In this case, it is possible to freely mold a plurality of liquid through holes for each plate member, or to mold one liquid through hole. Can be.
[0017]
In the method of manufacturing a liquid jet head according to the aspect of the invention, when the plate-like member having the multi-contact surface and the plate-like member having the single contact surface are alternately arranged in the circumferential direction, the multi-contact surface is used. Since the concentric rows of liquid through holes and the concentric rows of liquid through holes by a single contact surface can be combined, the liquid that has passed through each of the liquid through holes is not biased in the liquid supply needle. It flows down with good distribution.
[0018]
In the method of manufacturing a liquid jet head according to the aspect of the invention, the inner end surface of the plate member on the axial center side is a stepped shape portion, and the contact surface is formed in the vicinity of the protruding corner portion of the stepped shape portion. In the case where the contact surface is in contact with the vicinity of the corner of the male multi-stage structure, the corners of the plate-shaped member and the highly rigid locations near the corner of the multi-stage structure are in contact with each other. Surface contact with good adhesion is ensured, and liquid holes with precise shapes and dimensions can be obtained. For example, it is possible to prevent the occurrence of “burrs” at the peripheral portion of the liquid passage hole.
[0019]
In the method for manufacturing a liquid jet head according to the present invention, when a portion other than the contact portion between the part of the male multistage structure portion and the contact surface of the plate-like member is a space portion into which the molding material flows. Since the space portion is arranged, the molding material is connected in a ring shape. Then, since the pointed skeleton is formed by integrating the annular portion and the skeleton member existing in the generatrix direction of the pointed portion, the strength of the pointed portion can be increased.
[0020]
In the method for manufacturing a liquid jet head according to the aspect of the invention, the contact surface is disposed in a direction substantially orthogonal to the direction of the axis and is disposed in a direction substantially orthogonal to the direction of the axis. In the case where they are in close contact with the end face of the male-type multistage structure portion, the openings of the liquid through holes are concentrically arranged on a virtual plane substantially orthogonal to the axis. As a result, a liquid through hole having a low flow resistance is secured under a predetermined arrangement form.
[0021]
In the method of manufacturing a liquid jet head according to the aspect of the invention, the contact surface is arranged in a direction substantially along the direction of the axis, and is a male type arranged in a direction substantially along the direction of the axis. In the case where they are in close contact with the outer surface of the multistage structure portion, the openings of the liquid through holes are arranged concentrically on a virtual cylindrical surface substantially concentric with the axis. As a result, a liquid through hole having a low flow resistance is secured under a predetermined arrangement form.
[0022]
In the method of manufacturing a liquid jet head according to the aspect of the invention, when the contact surface and the outer surface are inclined surfaces with the apex side approaching the axial center, when the male mold is incorporated into the female mold, The contact surface and the outer surface approach each other without interfering with each other, and at the position where the combination of both types is completed, the contact surface and the outer surface are in close contact with each other.
[0023]
In order to achieve the above object, a liquid ejecting head according to the present invention includes a flow path forming member to which a liquid ejecting section that ejects the liquid supplied from the liquid storing means is attached, and the liquid storing head that is attached to the flow path forming member. A liquid ejecting head configured to receive a liquid supply from the means and include a liquid supply needle having a circular cross section and a liquid through hole provided at the tip of the tip, and having a conical outer periphery of the tip A plurality of grooves arranged in a circumferential direction are formed on the surface, and the bottom of each groove is arranged in a direction substantially perpendicular to the vertical surface and the shaft center arranged in a direction substantially along the axis of the liquid supply needle. The gist of the invention is that it is constituted by a set with the arranged lateral surface, and a liquid through hole is provided in a part of the lateral surface.
[0024]
That is, a plurality of grooves arranged in the circumferential direction are formed on the conical outer peripheral surface of the pointed portion, and a bottom surface of each groove is arranged in a direction substantially along the axis of the liquid supply needle; It is constituted by a pair with a lateral surface arranged in a direction substantially perpendicular to the axis, and a liquid through hole is provided in a part of the lateral surface.
[0025]
Therefore, the openings of the liquid through holes are arranged in the circumferential direction on a virtual plane substantially orthogonal to the axis. As a result, a liquid through hole having a low flow resistance is secured under a predetermined arrangement form. Furthermore, when the liquid through holes are arranged in a circumferential direction on a single virtual plane, the distribution of the liquid through holes at the apex can be optimized for the liquid flow in the liquid supply needle. For example, it is possible to prevent an uneven flow in the liquid supply needle. In addition, by arranging a plurality of sets in the direction of the generatrix of the apex portion or a single set in the above set units, or by combining these sets, it is possible to freely set the opening position and number of liquid through holes. Can be selected.
[0026]
In the liquid ejecting head according to the aspect of the invention, when the groove portion in which a plurality of the sets are arranged and the groove portion in which the one set is arranged are alternately arranged in a circumferential direction, the plurality of liquid through holes are formed as cusps. By arranging one liquid through hole on the adjacent bus bar, the distribution of the opening of the liquid through holes at the apex becomes good. In addition, a liquid through hole located on the large-diameter side of the apex among the liquid through holes of the groove portion where a plurality of sets are arranged and a liquid through hole of the groove portion where one set is arranged are arranged on the same circumference. By increasing the number of liquid through holes on the large diameter side of the apex and decreasing the number of liquid through holes on the small diameter side of the apex, the liquid flow distribution in the liquid supply needle can be made uniform. Can do.
[0027]
In order to achieve the above object, a liquid ejecting head according to the present invention includes a flow path forming member to which a liquid ejecting section that ejects the liquid supplied from the liquid storing means is attached, and the liquid storing head that is attached to the flow path forming member. A liquid ejecting head configured to receive a liquid supply from the means and include a liquid supply needle having a circular cross section and a liquid through hole provided at the tip of the tip, and having a conical outer periphery of the tip A plurality of grooves arranged in a circumferential direction are formed on the surface, and the bottom of each groove is arranged in a direction substantially perpendicular to the vertical surface and the shaft center arranged in a direction substantially along the axis of the liquid supply needle. The gist of the present invention is that it is constituted by a set with the arranged horizontal surface, and a liquid through hole is provided in a part of the vertical surface.
[0028]
That is, a plurality of grooves arranged in the circumferential direction are formed on the conical outer peripheral surface of the pointed portion, and a bottom surface of each groove is arranged in a direction substantially along the axis of the liquid supply needle; It is constituted by a pair with a horizontal surface arranged in a direction substantially perpendicular to the axis, and a liquid through hole is provided in a part of the vertical surface.
[0029]
Therefore, the openings of the liquid passage holes are concentrically arranged on a virtual cylindrical surface substantially concentric with the axis. As a result, a liquid through hole having a low flow resistance is secured under a predetermined arrangement form. Furthermore, when the liquid through holes are arranged in a circumferential direction on a single virtual cylindrical surface, the opening distribution of the liquid through holes at the apex can be optimized for the liquid flow in the liquid supply needle. . For example, it is possible to prevent an uneven flow in the liquid supply needle. In addition, by arranging a plurality of sets in the direction of the generatrix of the apex portion or a single set in the above set units, or by combining these sets, it is possible to freely set the opening position and number of liquid through holes. Can be selected.
[0030]
In the liquid ejecting head according to the aspect of the invention, when the groove portion in which a plurality of the sets are arranged and the groove portion in which the one set is arranged are alternately arranged in a circumferential direction, the plurality of liquid through holes are formed as cusps. By arranging one liquid through hole on the adjacent bus bar, the distribution of the opening of the liquid through holes at the apex becomes good. In addition, a liquid through hole located on the large-diameter side of the apex among the liquid through holes of the groove portion where a plurality of sets are arranged and a liquid through hole of the groove portion where one set is arranged are arranged on the same circumference. By increasing the number of liquid through holes on the large diameter side of the apex and decreasing the number of liquid through holes on the small diameter side of the apex, the liquid flow distribution in the liquid supply needle can be made uniform. Can do.
[0031]
In order to achieve the above object, a mold for manufacturing a liquid ejecting head according to the present invention includes a flow path forming member to which a liquid ejecting section that ejects liquid supplied from a liquid storage means is attached, and the flow path forming member. A mold for manufacturing a liquid ejecting head, which includes a liquid supply needle that is attached and receives a liquid supply from the liquid storage means and has a circular cross-section with a liquid through hole at the tip of the liquid storage means. The mold for molding the liquid supply needle is composed of a female mold and a male mold that match with each other in a predetermined positional relationship, and the apex side of the male mold is stepped concentrically with a small diameter. Is provided, and a through hole molding member for molding the liquid through hole is provided at a portion of the female mold for molding the cusp, and the through hole molding member is formed on the inner surface of the female mold. Are arranged in a state of projecting from the The molding member, and summarized in that the contact surfaces in contact with each stage of the multistage structure is formed.
[0032]
That is, the mold for molding the liquid supply needle is composed of a female mold and a male mold that match with each other in a predetermined positional relationship, and the cusp portion of the male mold is concentrically stepped with a small diameter on the side where the cusp is molded. An arranged multistage structure portion is provided, and a through-hole molding member for molding the liquid through-hole is provided at a site where the tip of the female die is molded, and the through-hole molding member is formed from the inner surface of the female die. A plurality of the protrusions are arranged so as to protrude substantially toward the axial center, and the through-hole molded member is formed with a contact surface that contacts each step of the multi-stage structure portion.
[0033]
Therefore, since the molten molding material does not flow into the surface abutting portion of the contact surface, a liquid through hole is formed at the contact surface. Such contact is made at a plurality of concentric locations between the male multi-stage structure and the female through-hole molding member, so that the molded liquid through-holes are concentric at the apex. Arranged and a required flow path area is ensured at a predetermined through hole position. In addition, the durability of the mold is ensured because the highly rigid parts of the female part and the male part directly contact each other without adopting the fine structure like the core pin described above. Can be improved and simplified. Due to such rigidity improvement, a molding material such as a molten resin can be injected at a high pressure, so that the molding material flows into every corner of the detailed structure of the apex, so that a short-circuit portion due to lack of hot water does not occur. In addition, since the flow rate of the molding material is improved, the temperature drop of the molding material is reduced as much as possible, and the fused state in the weld line is improved. Further, since the liquid through hole formed in this way has a form without a passage length, the flow passage resistance of the liquid accompanying the passage length can be minimized at the apex portion of the liquid supply needle.
[0034]
In addition, when the liquid supply needle is bonded to the flow path forming member by ultrasonic bonding, ultrasonic vibration is transmitted to each part of the liquid supply needle. Excessive stress does not act on the fine structure part. Furthermore, since the weld line existing there also has good fusing property, the melting phenomenon due to the “slip movement” at the position of the line can be avoided.
[0035]
In the mold for manufacturing a liquid jet head according to the present invention, the through-hole molded member is a plate-like member, and a contact surface that contacts the male multistage structure portion is formed on a surface portion formed in the thickness direction. In this case, the through-hole molding member can be integrated with the female die under high rigidity as a member protruding from the inner surface of the female die, so that the durability of the die can be improved. Further, since it is a plate-like member, it functions as a guide plate for the flow of the molding material, and an orderly material flow can be formed toward the tip of the apex. The contact surface can be secured with a simplified structure on the surface portion formed in the thickness direction of the plate-like member. Further, the surface portion can be easily selected by selecting the shape of the end surface of the plate-like member on the axial center side, so that accurate surface contact with the male multi-stage structure portion can be ensured, and the liquid The through hole can be molded normally.
[0036]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
[0037]
As described above, the liquid ejecting head that is the object of the present invention can function for various liquids, and in the illustrated embodiment, as a typical example, it is employed in an ink jet recording apparatus. The recording head to be used is an object of the embodiment.
[0038]
1 to 4 are views showing an example of a peripheral structure of an ink jet recording apparatus to which the present invention is applied. This apparatus includes a carriage 3 on which an ink cartridge 2 is mounted and an ink ejecting section 1 is attached.
[0039]
The carriage 3 is connected to a stepping motor 5 via a timing belt 4 and is guided by a guide bar 6 to reciprocate in the paper width direction (main scanning direction) of the recording paper 7. The carriage 3 has a box shape that opens to the top, is attached so that the nozzle surface of the ink ejecting section 1 is exposed on the surface facing the recording paper 7 (the lower surface in this example), and the ink cartridge 2 is accommodated. It has become so.
[0040]
Then, ink is supplied from the ink cartridge 2 to the ink ejecting section 1 and ink droplets are ejected onto the upper surface of the recording paper 7 while moving the carriage 3 to print images and characters on the recording paper 7 in a dot matrix. ing. In FIG. 1, reference numeral 8 denotes a cap that prevents the nozzle from being dried as much as possible by sealing the nozzle opening of the ink ejecting section 1 during a printing pause, and 9 is a wiper member that wipes the nozzle surface of the ink ejecting section 1. Further, as shown in FIG. 1, a guide bar 6 is inserted into the carriage 3.
[0041]
FIG. 2 shows an example of the basic structure of the head body 10 used in the ink ejecting unit 1. The head body 10 is configured by joining a flow path unit 13 in which a nozzle opening 11 and a pressure generation chamber 12 are formed, and a head case 15 in which a piezoelectric vibrator 14 is accommodated.
[0042]
The flow path unit 13 has a space corresponding to a nozzle plate 16 having a nozzle forming surface in which the nozzle openings 11 are formed, an ink chamber 17 common to the pressure generation chamber 12, and an ink supply path 18 that communicates these. The formed flow path forming plate 19 and the vibration plate 20 that closes the opening of the pressure generating chamber 12 are laminated and formed.
[0043]
The piezoelectric vibrator 14 is a so-called longitudinal vibration mode vibrator that contracts in the longitudinal direction in a charged state upon input of a drive signal and extends in the longitudinal direction in the process of discharging from the charged state. The piezoelectric vibrator 14 is fixed to the base 21 with the other end fixed to the island 20 </ b> A of the diaphragm 20 that forms a part of the pressure generating chamber 12.
[0044]
In the head case 15, a head flow path 24 for introducing the ink of the ink cartridge 2 into the ink chamber 17 is formed at a portion corresponding to the ink chamber 17. An annular protrusion 23 is formed on the opening edge of the head channel 24.
[0045]
In the head body 10, the pressure generation chamber 12 expands and contracts in response to the contraction / extension of the piezoelectric vibrator 14, and ink suction and ink droplet discharge are performed by pressure fluctuation in the pressure generation chamber 12. It has become. In FIG. 2, reference numeral 22 denotes a flexible circuit board that inputs a drive signal to the piezoelectric vibrator 14.
[0046]
In the head body 10, the piezoelectric vibrator 14, the pressure generating chamber 12, and the nozzle opening 11 are arranged in a direction perpendicular to the paper surface in FIG. 2, and the nozzle plate 16 has two nozzle rows. Yes.
[0047]
3 and 4 are diagrams showing an ink jet head H in which the head body 10 is used. The ink ejecting unit 1 includes a head main body 10 and a head holder 32 to which the head main body 10 is attached. In the present invention, the head holder 32 is a member corresponding to the “flow path forming member”, and is assembled as a separate part to the carriage 3 shown in FIG. is doing. In the present invention, the “flow path forming member” corresponds to both the former and the latter. Hereinafter, this “flow path forming member” is referred to as a head holder, and each embodiment is a case where it is assembled as a separate part.
[0048]
In the figure, 28 is a cover member that covers the head body 10, 40 is a screw that attaches the head body 10 to the head holder 32, and 41 is a screw insertion hole formed in the cover member 28. Reference numeral 38 denotes two insertion tubes projecting from the surface of the head case 15 facing the head holder 32, and a screw 40 is inserted through the insertion tube 38.
[0049]
The head holder 32 is provided with a plurality (four in this example) of ink supply needles 27 which are inserted into the ink cartridge 2 and receive ink supply. Each of the ink supply needles 27 is hollow and has an ink hole 34 formed at the tip. A filter 31 that filters the ink supplied from the ink cartridge 2 is provided at the base of each ink supply needle 27.
[0050]
The head holder 32 has a holder flow path 30 that communicates with the ink supply needles 27 and communicates with the head flow path 24 of the head body 10 to introduce the ink of the ink cartridge 2 into the head body 10. Is formed.
[0051]
A head substrate 36 that sends a drive signal to the piezoelectric vibrator 14 of the head body 10 via the flexible circuit board 22 is provided between the head holder 32 and the head body 10. A circuit board insertion hole 35 through which the flexible circuit board 22 is inserted is formed in the head substrate 36.
[0052]
The head substrate 36 is provided with a through hole 37 penetrating vertically in portions corresponding to the lower opening of the holder flow path 30 and the upper opening of the head flow path 24, and the head case 15 is formed in the through hole 37. The annular protrusion 23 is inserted so that the opening of the annular protrusion 23 is exposed on the upper surface of the head substrate 36.
[0053]
Further, the head substrate 36 is formed with an insertion hole 47 through which one insertion tube 38 of the head body 10 is inserted, and a rectangular cutout 43 that prevents interference with the other insertion tube 38. As described above, since the notch 43 prevents the interference with the one insertion tube 38, the processing of the head substrate 36 in this portion is facilitated, and the processing cost can be reduced.
[0054]
Between the head substrate 36 and the head holder 32, a seal member 29 having a communication port 33 for communicating the holder flow path 30 and the head flow path 24 is sandwiched. The seal member 29 is made of an elastic material such as rubber, soft resin, or elastomer. The seal member 29 is in contact with the lower opening of the holder flow path 30 and the upper opening of the head flow path 24 in a state where the head holder 32, the head substrate 36, and the head main body 10 are assembled. The path 30 and the head flow path 24 are communicated with each other and the connection portion is sealed.
[0055]
By forming the seal member 29 from an elastic material, the seal member 29 is crushed and closely adhered between the opening of the annular protrusion 23 and the opening of the holder flow path 30, so that the holder flow path 30 and the head flow path 24 The connection is securely sealed. In addition, the connection portion of the flow path can be reliably sealed only by bringing the seal member 29 made of an elastic material into contact with the opening of the head flow path 24 and the opening of the holder flow path 30, and the assemblability is not impaired.
[0056]
Further, the head case 15 of the head main body 10 is press-fitted into a press-fitting hole 46 formed in the seal member 29 to prevent the seal member 29 from falling off during assembly or cleaning of the head main body 10. A member 44 is protruded. Further, the seal member 29 is formed with two insertion holes 47 through which the insertion tube 38 of the head body 10 is inserted.
[0057]
The head case 15 of the head body 10 has a columnar warpage prevention member 39 that contacts the seal member 29 and prevents the seal member 29 from warping at a portion corresponding to the notch 43 of the head substrate 36. It is installed. On the upper surface of the warp preventing member 39, a columnar anti-rotation member 42 that fits into a fitting hole 45 formed in the seal member 29 and prevents unnecessary rotation of the seal member 29 is coaxial with the warp preventing member 39. It protrudes in a shape.
[0058]
As described above, the ink from the ink cartridge 2 flows into the ink supply needle 27 and then passes through the holder channel 30 of the head holder 32. Further, the ink flows into the head flow path 24 from the communication port 33 of the seal member 29, is supplied to the flow path unit 13, and is ejected as ink droplets from the nozzle opening 11. The ink ejection unit 25 is configured by the head case 15, the piezoelectric vibrator 14, the flow path unit 13, and the like. A series of ink flow paths 26 is formed from the inner hollow portion of the ink supply needle 27 through the holder flow path 30 and the communication port 33 to the ink ejection unit 25.
[0059]
In the present invention, an ink ejection head H that is a liquid ejection head is configured by an assembly of components from the ink supply needle 27 to the nozzle opening 11. Accordingly, main members constituting the ink ejecting head H are the ink supply needle 27, the head holder 32, the seal member 29, the ink ejecting portion 25, and the like.
[0060]
The present invention is a method of manufacturing a liquid ejecting head, a liquid ejecting head manufactured by the same manufacturing method, and a mold for manufacturing. However, in order to facilitate understanding of the entire present invention, the configuration of the ink supply needle is first described. explain. The entire ink supply needle is denoted by reference numeral 27, and the same portion as the structure shown in FIG. 11 is given the same reference numeral in the structure of each part of the ink supply needle.
[0061]
That is, in the hollow ink supply needle 27 having a circular cross section, the straight tube portion 81 and the tip portion 82 formed of the entire conical portion provided at the tip thereof and the inner diameter of the straight tube portion 81 are gradually increased. The enlarged diameter portion 83 is formed. The structure of the ink supply needle 27 is shown in FIGS. 5 and 6, but the perspective view of FIG. 6 is illustrated with an enlarged dimension of a groove portion and the like described later for easy understanding.
[0062]
Elongated grooves 49 and 50 are formed in the conical outer peripheral surface 48 of the pointed portion 82 in the generatrix direction of the conical outer peripheral surface 48. The groove portion 49 is a long groove in which a plurality of ink through holes 49A are formed, and the groove portion 50 is a short groove in which one ink through hole 50A is formed. Here, the longer groove 49 has two ink holes 49A.
[0063]
The bottom of the groove 49 has a stepped shape, as best shown in FIG. Due to such a stepped shape, a vertical surface 49B arranged in a direction substantially along the axis of the ink supply needle 27 and a horizontal surface 49C arranged in a direction substantially perpendicular to the axis are paired. In the groove portion 49, two sets of the above-described groups are arranged in a staircase pattern. Ink holes 49A are provided on the respective lateral surfaces 49C.
[0064]
As best shown in FIG. 6, the bottom of the groove 50 is disposed in a direction substantially perpendicular to the longitudinal axis 50 </ b> B disposed in the direction substantially along the axis of the ink supply needle 27. The lateral surface 50 </ b> C forms a set, and the groove portion 50 constitutes one set. An ink through hole 50A is provided on the horizontal surface 50C.
[0065]
Of the ink passage holes 49A, the ink passage holes 49A located on the larger diameter side of the conical outer peripheral surface 48 are arranged in the circumferential direction on a virtual plane substantially orthogonal to the axis. Of the ink passage holes 49A, the ink passage holes 49A located on the small diameter side of the conical outer peripheral surface 48 are circumferentially arranged on a virtual plane substantially orthogonal to the axis different from the virtual plane. Is arranged. Accordingly, the ink through holes 49A arranged on the large diameter side of the conical outer peripheral surface 48 and the ink through holes 49A arranged on the small diameter side of the conical outer peripheral surface 48 are separated in the axial direction and are concentrically arranged. It will be arranged.
[0066]
On the other hand, the ink through holes 50A are arranged in a circumferential direction on a virtual plane similar to the virtual plane located on the large diameter side of the conical outer peripheral surface 48. In this embodiment, the ink through holes 50A and 49A are arranged in the same virtual plane.
[0067]
Accordingly, the openings of the ink through holes 49A and 50A are arranged in the circumferential direction on a virtual plane substantially orthogonal to the axis. As a result, the ink through holes 49A and 50A with low flow resistance are secured under a predetermined arrangement form. Further, the ink through holes 49A and 50A are arranged in a circumferential direction on a virtual plane on the large diameter side of the conical outer peripheral surface 48, and the other ink through hole 49A is a different virtual plane on the small diameter side of the conical outer peripheral surface 48. By being arranged in the circumferential direction above, the opening distribution of the ink through holes 49A, 50A at the cusp 82 can be optimized for the ink flow in the ink supply needle 27. For example, it is possible to prevent an uneven flow in the ink supply needle 27. Further, by arranging a plurality of sets in the direction of the generatrix of the cusp 82 or a single set in the above set unit, or by combining these sets, the positions of the ink through holes 49A and 50A can be changed. The number can be selected freely.
[0068]
Next, a method for manufacturing the ink supply needle 27 will be described mainly with reference to FIGS.
[0069]
As a molding material in a molten state, a light alloy such as aluminum, a synthetic resin such as polypropylene or polyethylene, and the like can be used. However, the latter material is used here. The molding die 51 is composed of a female die 52 and a male die 53 that are matched in a predetermined positional relationship. A multistage structure portion 54 is formed at a portion where the point portion 82 of the male mold 53 is molded. The male mold 53 has a circular cross section, and a multistage structure portion 54 is configured by a small diameter portion 54A having a small diameter on the side of the sharpened portion 82 and a large diameter portion 54B having a larger diameter than the small diameter portion 54A. Reference numerals 54C and 54D denote end surfaces of a small diameter portion 54A and a large diameter portion 54B, respectively, which contact surfaces described later meet. In addition, the multi-stage structure portion 54 here has two stages, but this may be three stages or four stages if necessary.
[0070]
A plurality of plate-like members 55, which are through-hole molding members, are provided at a portion where the pointed portion 82 of the female mold 52 is molded. The plate-like member 55 is for molding the grooves 49 and 50 shown in FIG. 6, and is arranged in a state of protruding from the inner surface of the female mold 52 toward the substantial axis of the ink supply needle 27. A vertical surface 55B and a horizontal surface 55C substantially orthogonal to the vertical surface 55B are formed on the inner end surface of the plate-shaped member 55, that is, a surface in the thickness direction of the plate-shaped member 55. The vertical surface 55B and the horizontal surface 55C form a pair. The vertical surface 55B forms a vertical surface 49B of the groove portion 49, and the horizontal surface 55C is arranged for forming the horizontal surface 49C of the groove portion 49. Yes. Therefore, the vertical surface 55B is a surface substantially parallel to the axis, and the horizontal surface 55C is a surface substantially orthogonal to the axis. By arranging a plurality of such sets of the vertical surface 55B and the horizontal surface 55C, the staircase-shaped portion 56 is configured.
[0071]
Moreover, the single step-shaped part 57 which forms the vertical surface 50B and the horizontal surface 50C of the groove part 50 is comprised by arrange | positioning one set of the vertical surface 55B and the horizontal surface 55C.
[0072]
A contact surface 55A is formed in the vicinity of the protruding corner portion 56A of the stepped shape portion 56. In the case of FIG. 8, the contact surface 55A is formed on the lateral surface 55C in the vicinity of the corner portion 56A. That is, the contact surface 55A is formed at the end portion on the axial center side of the lateral surface 55C. The contact surface 55A is in close contact with the end surface 54C of the male mold 53 when the male and female molds 52 and 53 are combined. The other contact surface 55A is in close contact with the end surface 54D of the male mold 53. Accordingly, the contact surfaces 55A and 55A arranged at two locations contact each step (54C and 54D) of the multi-stage structure portion 54 at a plurality of locations on a concentric circle. On the other hand, the single step-shaped portion 57 is provided with a single contact surface 55A.
[0073]
With the above configuration, when the contact surface 55A is provided at two locations on the plate-like member 55, it is “a plate-like member having a multi-contact surface”. “A plate-like member having a single contact surface”.
[0074]
In addition, by appropriately setting the step size of the multistage structure portion 54 and the position of the contact surface 55A of the stepped shape portion 56, the interval between the ink through holes 49A in the generatrix direction can be obtained correctly.
[0075]
A portion other than the contact portion between a part of the multistage structure portion 54 of the male mold 53 and the contact surface 55A of the plate-like member 55 is a space portion 55D into which a molding material flows. By arranging the space portion 55D, the molding material is connected in a ring shape. Then, since the ring-shaped portion and the skeleton member 48A (see FIG. 8D) existing in the generatrix direction of the cusp 82 are integrated to form a cusp skeleton, the strength of the cusp is increased. can do.
[0076]
The locations where the plate-like members 55, 55 shown in FIGS. 8A and 8B are not arranged have a male-female type relationship as shown in FIG. As shown in FIG. 6, this portion becomes a cavity portion that forms a skeleton member 48 </ b> A in the generatrix direction extending from the top of the pointed portion 82 to the straight pipe portion 81.
[0077]
In FIG. 7, a space 58 between the molds 52 and 53 is a product cavity of the ink supply needle 27. In the same drawing, the portions indicated by the two-dot chain line indicate the respective structural portions of the ink supply needle 27. An injection port 59 for injecting a molten resin such as polypropylene or polyethylene is formed below the product cavity 58.
[0078]
Next, the flow state of the resin due to the injection of the molten resin will be described.
[0079]
When molten resin is injected from the injection port 59, the molten resin rises at substantially the same height over the entire annular cavity 83A of the enlarged diameter portion 83, and subsequently, the cavity portion 81A of the straight pipe portion 81. To flow into. The molten resin that has flowed in this manner flows along the plate-like member 55 into the cavity portion 82A of the cusp 82, and the structure of each part of the cusp 82 is molded.
[0080]
The molten resin that has flowed into the cavity portion 82 </ b> A of the pointed portion 82 flows into every corner of the cavity portion 82 </ b> A with less turbulence while being guided by the plate-like member 55. At this time, since the portion of the contact surface 55A is in close contact with the end surfaces 54C and 54D, the molten resin does not flow into this close contact portion. Therefore, when the ink supply needle 27 is removed from the mold 51, the ink through holes 49A and 50A are arranged in the circumferential direction. Further, the molten resin also flows into the space 55D and is formed in a circumferential direction at the pointed portion 82 in a ring shape.
[0081]
Since the molten resin does not flow into the location of the contact surface 55A by the manufacturing process as described above, ink through holes 49A and 50A are formed at the location of the contact surface 55A. Such contact is made at a plurality of concentric positions between the multistage structure portion 54 of the male mold 53 and the plate-like member 55 of the female mold 52, so that the formed ink through holes 49A and 50A Arranged concentrically at the apex 82, a required flow path area is ensured at a predetermined through hole position. Further, since a portion having a high rigidity between a part of the female mold 52 and a part of the male mold 53 directly contacts each other without adopting a fine structure like the above-described core pin, the mold The durability of 51 can be improved and simplified. Due to such rigidity improvement, a molding material such as a molten resin can be injected at a high pressure, so that the molten resin flows into every corner of the detailed structure of the cusp 82, and a short portion due to a lack of hot water does not occur. In addition, since the flow rate of the molten resin is improved, the temperature drop of the molten resin is reduced as much as possible, and the welded state in the weld line is improved. Further, since the ink through holes 49A and 50A formed in this manner have no passage length, the ink flow path resistance associated with the flow path length is minimized at the apex portion 82 of the ink supply needle 27. can do.
[0082]
Since the plate-like member 55 is projected from the inner surface of the female die 52 and can be integrated with the female die 52 with high rigidity, the durability of the die can be improved. Further, since the plate-like member 55 is used, the function as a guide plate for the flow of the molten resin is fulfilled, and an orderly material flow can be formed toward the tip of the cusp 82. Since the contact surface 55A is a surface portion formed on the surface of the plate-like member 55 in the thickness direction, the formation of the contact surface 55A can be ensured with a simplified structure. Further, since the surface portion can be easily selected by setting the end surface shape of the plate-like member 55 on the axial center side, accurate surface abutting with respect to the multistage structure portion 54 of the male mold 53 is ensured. Ink holes 49A and 50A can be molded normally.
[0083]
Since the number of contact surfaces 55A can be freely set on the plate-like member 55, it is possible to freely mold a plurality of ink through holes 49A or a single ink through-hole 50A with one plate-like member 55. In addition, the number of ink through holes 49A and 50A or the flow passage area at the apex 82 can be set to an optimum value. Since the plate-like member 55 having the multi-contact surface and the plate-like member 55 having the single contact surface are alternately arranged in the circumferential direction, the row of ink through holes 49A on the concentric circles by the multi-contact surface In addition, since the concentric circles of the ink through holes 50A by the single contact surface can be combined, the ink that has passed through the ink through holes 49A and 50A has a good distribution without being biased in the ink supply needle 27. Flow down.
[0084]
Since the corner portions 56A of the plate-like member 55 and the highly rigid portions near the corner portions of the multistage structure portion 54 are in contact with each other, surface contact with good adhesion is ensured, and ink passages with precise shapes and dimensions are provided. 49A and 50A are obtained. For example, it is possible to prevent “burrs” from occurring in the peripheral portions of the ink through holes 49A and 50A.
[0085]
By arranging the space portion 55D, the molding material is connected in a ring shape. And since the cyclic | annular continuous part and the skeleton member 48A which exists in the generatrix direction of the cusp 82 are integrated, the skeleton of the cusp is formed, so that the strength of the cusp can be increased.
[0086]
The contact surface 55A is arranged in a direction substantially orthogonal to the direction of the axis, and the multistage structure portion 54 of the male mold 53 is arranged in a direction substantially orthogonal to the direction of the axis. Since the end surfaces 54C and 54D are in close contact with each other, the openings of the ink through holes 49A and 50A are arranged concentrically on a virtual plane substantially orthogonal to the axis. As a result, a liquid through hole having a low flow resistance is secured under a predetermined arrangement form.
[0087]
9 and 10 show a second embodiment of the method of manufacturing a liquid jet head according to the present invention.
[0088]
The bottoms of the plurality of grooves 49 and 50 formed on the conical outer peripheral surface 48 of the cusp 82 are connected to the vertical surfaces 49B and 50B arranged in a direction substantially along the axis of the ink supply needle 27 and the axis. The lateral surfaces 49C and 50C arranged in a substantially orthogonal direction are respectively configured as a set, and ink through holes 49A and 50A arranged in the circumferential direction are provided in a part of the vertical surfaces 49B and 50B.
[0089]
Accordingly, the openings of the ink through holes 49A and 50A are concentrically arranged on a virtual cylindrical surface substantially concentric with the axis. As a result, the ink through holes 49A and 50A with low flow resistance are secured under a predetermined arrangement form. Further, when the ink through holes 49A and 50A are arranged in a circumferential direction on a single virtual cylindrical surface, the distribution of the openings of the ink through holes 49A and 50A at the cusp 82 is determined by the ink in the ink supply needle 27. Can be optimized for the flow. For example, it is possible to prevent an uneven flow in the ink supply needle 27. Further, by arranging a plurality of sets in the direction of the generatrix of the cusp 82 or a single set in the above set unit, or by combining these sets, the positions of the ink through holes 49A and 50A can be changed. The number can be selected freely.
[0090]
In the ink supply needle 27 manufactured in this embodiment, an ink through hole 49 </ b> A is opened on a vertical surface 49 </ b> B arranged in a direction substantially along the axis of the ink supply needle 27. 10A is a case where two ink through holes 49A are formed in the groove 49, and molding of one ink through hole 50A in the groove 50 is the same as in the case of the ink through hole 49A. .
[0091]
Since the direction of the ink passage hole 49A is as described above, the contact surface 55A is arranged in a direction substantially along the axis of the ink supply needle 27 as shown in FIG. The contact surface 55A comes into contact with the outer surfaces 54E and 54F of the multistage structure portion 54. In order to ensure this contact, the contact surface 55A and the outer surfaces 54E and 54F are inclined surfaces with the apex 82 side approaching the axis. The symbol θ in the figure indicates the inclination angle of the inclined surface. Accordingly, tapered surfaces 54G and 54H are formed on the upper portions of the outer surfaces 54E and 54F. In this way, when the male mold 53 is assembled into the female mold 52, the contact surface 55A and the outer surfaces 54E and 54F approach each other without interference, and the combination of the molds 52 and 53 is completed. In this position, contact between the contact surface 55A and the outer surfaces 54E and 54F (tapered surfaces 54G and 54H) is secured. Other than that, it is the same as that of the said embodiment, and the same code | symbol is attached | subjected to the same part.
[0092]
Therefore, the openings of the ink through holes 49A and 50A are arranged concentrically on the virtual cylindrical surface substantially concentric with the axis. As a result, the ink through holes 49A and 50A with low flow resistance are secured under a predetermined arrangement form. Other than that, there exists an effect similar to the said embodiment.
[0093]
As shown in FIGS. 5 and 6, the liquid ejecting head according to the present invention has the bottoms of the plurality of grooves 49 and 50 formed on the conical outer peripheral surface 48 of the cusp 82 as the axis of the ink supply needle 27. The vertical surfaces 49B and 50B arranged in a substantially along direction and the horizontal surfaces 49C and 50C arranged in a direction substantially perpendicular to the axis are configured as a pair, and a part of the horizontal surfaces 49C and 50C has a circumference. Ink passage holes 49A and 50A arranged in the direction are provided.
[0094]
Accordingly, the openings of the ink through holes 49A and 50A are arranged on a virtual plane substantially orthogonal to the axis. As a result, the ink through holes 49A and 50A with low flow resistance are secured under a predetermined arrangement form. Further, when the ink through holes 49A and 50A are arranged in a circumferential direction on a single virtual plane, the distribution of the openings of the ink through holes 49A and 50A at the cusp 82 is determined based on the ink flow in the ink supply needle 27. Can be optimized for. For example, it is possible to prevent an uneven flow in the ink supply needle 27. Further, by arranging a plurality of sets in the direction of the generatrix of the cusp 82 or a single set in the above set unit, or by combining these sets, the positions of the ink through holes 49A and 50A can be changed. The number can be selected freely.
[0095]
Then, by alternately arranging the plurality of sets and the single set in the circumferential direction, the opening distribution of the ink through holes 49A and 50A in the cusp 82 is improved. In addition, the ink through hole 49A located on the large diameter side of the cusp 82 in the ink through hole 49A of the groove portion 49 in which a plurality of sets are arranged is the same as the ink through hole 50A in the groove portion 50 in which one set is arranged. By arranging them on the circumference, the number of ink passage holes 49A, 50A on the large diameter side of the cusp 82 is increased, and the number of ink passage holes 49A on the small diameter side of the cusp 82 is decreased to supply ink. The distribution of the ink flow in the needle 27 can be made uniform.
[0096]
9 and 10 show a second embodiment of the liquid jet head according to the present invention.
[0097]
In this embodiment, the bottom surfaces of the plurality of grooves 49 and 50 formed on the conical outer peripheral surface 48 of the cusp 82 are arranged with the vertical surfaces 49B and 49B arranged in a direction substantially along the axis of the ink supply needle 27. Ink passage holes 49A and 50A, each of which is constituted by a pair of horizontal surfaces 49C and 50C arranged in a direction substantially orthogonal to the axis 50B and arranged in a part of the vertical surfaces 49B and 50B in the circumferential direction. Is provided. Other than that, it is the same as that of the said embodiment, and the same code | symbol is attached | subjected to the same part.
[0098]
Accordingly, the openings of the ink through holes 49A and 50A are concentrically arranged on a virtual cylindrical surface substantially concentric with the axis. As a result, the ink through holes 49A and 50A with low flow resistance are secured under a predetermined arrangement form. Further, when the ink through holes 49A and 50A are arranged in a circumferential direction on a single virtual cylindrical surface, the distribution of the openings of the ink through holes 49A and 50A at the cusp 82 is determined by the ink in the ink supply needle 27. Can be optimized for the flow. For example, it is possible to prevent an uneven flow in the ink supply needle 27. Further, by arranging a plurality of sets in the direction of the generatrix of the cusp 82 or a single set in the above set unit, or by combining these sets, the positions of the ink through holes 49A and 50A can be changed. The number can be selected freely. Other than that, there exists an effect similar to the said embodiment.
[0099]
The mold for manufacturing the liquid jet head according to the present invention has the configuration shown in FIGS. 7, 8, 10 and the like as already described.
[0100]
That is, the mold 51 for molding the ink supply needle 27 is composed of a female mold 52 and a male mold 53 that match in a predetermined positional relationship, and the apex 82 side has a small diameter at a site where the apex 82 of the male mold 53 is molded. A plate-like member 55 for molding the ink through holes 49A, 50A is provided at a portion where the pointed portion 82 of the female mold 52 is molded. A plurality of contact surfaces 55A that are arranged in a state of projecting from the inner surface of the female mold 52 toward the substantially axial center of the ink supply needle 27 and that are concentrically in contact with each stage of the multistage structure 54 are the plate-like members. 55.
[0101]
Therefore, since the molten molding material does not flow into the surface abutting portion of the contact surface 55A, ink through holes 49A and 50A are formed at the location of the contact surface 55A. Such contact is made at a plurality of concentric positions between the multistage structure portion 54 of the male mold 53 and the plate-like member 55 of the female mold 52, so that the molded ink through holes 49A and 50A They are arranged concentrically at the apex 82, and a required flow area is ensured at a predetermined through hole position. Further, since a portion having a high rigidity between a part of the female mold 52 and a part of the male mold 53 directly contacts each other without adopting a fine structure like the above-described core pin, the mold The durability can be improved and simplified. Due to such rigidity improvement, a molding material such as a molten resin can be injected at a high pressure, so that the molding material flows into every corner of the detailed structure of the cusp 82, and a short portion due to a lack of hot water does not occur. In addition, since the flow rate of the molding material is improved, the temperature drop of the molding material is reduced as much as possible, and the fused state in the weld line is improved. Further, since the ink through holes 49A and 50A formed in this manner have no passage length, the ink flow path resistance associated with the flow path length is minimized at the apex portion 82 of the ink supply needle 27. can do.
[0102]
Further, since the contact surface 55A where the plate-like member 55 contacts a part of the male mold 53 is a surface portion formed on the surface in the thickness direction of the plate-like member 55, the formation of the contact surface 55A is simple. It can be secured with a simplified structure. Further, the surface portion can be easily selected by selecting the shape of the end surface of the plate-like member 55 on the axial center side, so that accurate surface contact with the multistage structure portion 54 of the male mold 53 is ensured. Ink holes 49A and 50A can be molded normally.
[0103]
In the method of manufacturing the liquid ejecting head described above, the structure of the mold 51, for example, the structure of the ink supply needle 27 itself, which is a single component, is formed by the space portion 55D formed by matching the male and female molds 52 and 53. Performance is improved. Therefore, the structure of each part of the ink supply needle 27 manufactured by the above manufacturing method forms various inventions as the ink supply needle 27 itself or an ink ejection head including such an ink supply needle 27.
[0104]
In the above embodiment, the pressure generating element is in the form of the longitudinal vibration mode. In addition, the pressure generating element is of a form in which liquid is ejected in the flexural vibration mode or liquid is ejected by the liquid heating element. Also good. Further, the liquid storage means in the present invention includes an ink tank mounted on the main body side of the ink jet recording apparatus in addition to the type in which the ink cartridge is mounted on the carriage shown in the above embodiment. It may be of a type equipped with a sub-tank that absorbs pressure fluctuations.
[0105]
The above-described embodiment is intended for an ink jet recording apparatus. However, the liquid ejecting apparatus obtained by the present invention is not only intended for ink for an ink jet recording apparatus, but is a glue, nail polish. , Conductive liquid (liquid metal) or the like can be ejected. Further, in the above embodiment, the ink jet recording head using ink that is one of the liquids has been described. However, the ink jet recording head is used for manufacturing a color filter such as a recording head used in an image recording apparatus such as a printer or a liquid crystal display. Applicable to all liquid ejecting heads for ejecting liquid, such as color material ejecting head, organic EL display, electrode material ejecting head used for electrode formation such as FED (surface emitting display), bio-organic ejecting head used for biochip manufacturing, etc. It is also possible.
[0106]
【The invention's effect】
As described above, according to the method of manufacturing a liquid jet head of the present invention and the mold used therefor, the molding material in the molten state does not flow into the surface abutting portion of the contact surface. A liquid through hole is formed at the location. Such contact is made at a plurality of concentric locations between the male multi-stage structure and the female through-hole molding member, so that the molded liquid through-holes are concentric at the apex. Arranged and a required flow path area is ensured at a predetermined through hole position. In addition, it is a type in which the high-rigidity part of the female part and the male part are in direct contact with each other without adopting a fine structure like the above-described core pin. Can be improved and simplified. Due to such rigidity improvement, a molding material such as a molten resin can be injected at a high pressure, so that the molding material flows into every corner of the detailed structure of the apex, so that a short-circuit portion due to lack of hot water does not occur. In addition, since the flow rate of the molding material is improved, the temperature drop of the molding material is reduced as much as possible, and the fused state in the weld line is improved. Further, since the liquid through hole formed in this way has a form without a passage length, the flow passage resistance of the liquid accompanying the passage length can be minimized at the apex portion of the liquid supply needle.
[0107]
In addition, when the liquid supply needle is bonded to the flow path forming member by ultrasonic bonding, ultrasonic vibration is transmitted to each part of the liquid supply needle. Excessive stress does not act on the fine structure part. Furthermore, since the weld line existing there also has good fusing property, the melting phenomenon due to the “slip movement” at the position of the line can be avoided.
[0108]
Further, according to the liquid jet head of the present invention, the openings of the liquid through holes are arranged on a virtual plane that is substantially orthogonal to the axis. As a result, a liquid through hole having a low flow resistance is secured under a predetermined arrangement form. Furthermore, when the liquid through holes are arranged in a circumferential direction on a single virtual plane, the distribution of the liquid through holes at the apex can be optimized for the liquid flow in the liquid supply needle. For example, it is possible to prevent an uneven flow in the liquid supply needle. In addition, by arranging a plurality of sets in the direction of the generatrix of the apex portion or a single set in the above set units, or by combining these sets, it is possible to freely set the opening position and number of liquid through holes. Can be selected.
[0109]
Further, according to the liquid jet head of the present invention, the openings of the liquid through holes are arranged concentrically on a virtual cylindrical surface substantially concentric with the axis. As a result, a liquid through hole having a low flow resistance is secured under a predetermined arrangement form. Furthermore, when the liquid through holes are arranged in a circumferential direction on a single virtual cylindrical surface, the opening distribution of the liquid through holes at the apex can be optimized for the liquid flow in the liquid supply needle. . For example, it is possible to prevent an uneven flow in the liquid supply needle. In addition, by arranging a plurality of sets in the direction of the generatrix of the apex portion or a single set in the above set units, or by combining these sets, it is possible to freely set the opening position and number of liquid through holes. Can be selected.
[Brief description of the drawings]
FIG. 1 is a perspective view of an ink jet recording apparatus to which the present invention is applied.
FIG. 2 is a cross-sectional view of an ink ejection unit mounted on the ink jet recording apparatus.
FIG. 3 is an exploded perspective view of a recording head mounted on the ink jet recording apparatus.
FIG. 4 is a cross-sectional view of a recording head mounted on the ink jet recording apparatus.
FIG. 5 is a plan view, a bottom view, a partially enlarged view, and a cross-sectional view of an ink supply needle assembled to an ink ejecting head.
FIGS. 6A and 6B are a perspective view and a plan view showing a point of the ink supply needle. FIGS.
FIG. 7 is a cross-sectional view showing the overall structure of a mold for molding the ink supply needle.
FIG. 8 is a cross-sectional view and a perspective view showing the structure of each part of the mold.
FIG. 9 is a plan view, a bottom view, a partially enlarged view, and a sectional view of another ink supply needle assembled to the ink ejecting head.
FIG. 10 is a partial perspective view and sectional view of a mold for molding the ink supply needle.
FIG. 11 is a plan view, a bottom view, and a cross-sectional view showing a conventional ink supply needle.
[Explanation of symbols]
H Ink jet head
1 Ink jet section
2 Ink cartridge
3 Carriage
4 Timing belt
5 Stepping motor
6 Guide bar
7 Recording paper
8 cap
9 Wiper member
10 Head body
11 Nozzle opening
12 Pressure generation chamber
13 Channel unit
14 Piezoelectric vibrator
15 Head case
16 Nozzle plate
17 Ink chamber
18 Ink supply path
19 Flow path forming plate
20 Diaphragm
20A island
21 base
22 Flexible circuit boards
23 Annular projection
24 Head flow path
25 Ink jet section
26 Ink channel
27 Ink supply needle
28 Cover member
29 Seal member
30 Holder flow path
31 filters
32 Head holder, flow path forming member
33 Communication port
34 Ink hole
35 Circuit board insertion hole
36 Head substrate
37 Through hole
38 Intubation tube
39 Warpage prevention member
40 screws
41 Insertion hole
42 Anti-rotation member
43 Notch
44 Press-fit member
45 Insertion hole
46 Press-fit hole
47 Insertion hole
48 Conical outer peripheral surface
48A frame member
49 Groove
49A Ink hole
49B Vertical
49C side
50 groove
50A ink hole
50B vertical surface
50C side
51 type
52 female
53 Male
54 Multistage structure
54A Small diameter part
54B Large diameter part
54C end face
54D end face
54E outside
54F outer surface
54G taper surface
54H Tapered surface
θ Inclination angle
55 Plate member
55A contact surface
55B vertical surface
55C side
55D space
56 Staircase shape part
56A Corner
57 Stepped part
58 Space, product cavity
59 Inlet
80 Ink supply needle
81 Straight pipe
81A Cavity
82 Apex
82A Cavity
83 Expanded part
83A Cavity
84 Ink and liquid holes
85A inner end face
85B inner end face
86 Filter
87 border
88 Bottom face
89 ridge

Claims (3)

A flow path forming member to which a liquid ejecting section for ejecting the liquid supplied from the liquid storage means is attached, and a liquid is supplied from the liquid storage means to the tip of the tip of the flow path forming member. A liquid jet head including a hollow liquid supply needle having a circular cross section provided with a through-hole, wherein a plurality of grooves arranged in the circumferential direction are formed on the conical outer peripheral surface of the cusp. The bottom portion of each groove portion is configured by a set of a vertical surface arranged in a direction substantially along the axis of the liquid supply needle and a horizontal surface arranged in a direction substantially perpendicular to the axis, and the set is A liquid characterized in that a plurality of groove portions and a groove portion where one set of the above-mentioned sets are alternately arranged in the circumferential direction, and a liquid passage hole is provided in a part of the lateral surface Jet head.   A flow path forming member to which a liquid ejecting section for ejecting the liquid supplied from the liquid storage means is attached, and a liquid is supplied from the liquid storage means to the tip of the tip of the flow path forming member. A liquid jet head including a hollow liquid supply needle having a circular cross section provided with a through-hole, wherein a plurality of grooves arranged in the circumferential direction are formed on the conical outer peripheral surface of the cusp. The bottom of each groove is configured by a set of a vertical surface arranged in a direction substantially along the axis of the liquid supply needle and a horizontal surface arranged in a direction substantially perpendicular to the axis. A liquid ejecting head, wherein a liquid through hole is provided in a part of the liquid ejecting head. The liquid ejecting head according to claim 2, wherein a plurality of the groove portions in which the set is arranged and a groove portion in which the one set is arranged are alternately arranged in a circumferential direction.

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