JP3633461B2 - Inkjet printer head and manufacturing method thereof - Google Patents

Inkjet printer head and manufacturing method thereof Download PDF

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Publication number
JP3633461B2
JP3633461B2 JP2000260614A JP2000260614A JP3633461B2 JP 3633461 B2 JP3633461 B2 JP 3633461B2 JP 2000260614 A JP2000260614 A JP 2000260614A JP 2000260614 A JP2000260614 A JP 2000260614A JP 3633461 B2 JP3633461 B2 JP 3633461B2
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Japan
Prior art keywords
front head
ink
head unit
packing
fitting groove
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
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JP2000260614A
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Japanese (ja)
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JP2002067312A (en
Inventor
淳 廣田
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ブラザー工業株式会社
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Priority to JP2000260614A priority Critical patent/JP3633461B2/en
Priority claimed from US09/933,156 external-priority patent/US6729717B2/en
Publication of JP2002067312A publication Critical patent/JP2002067312A/en
Application granted granted Critical
Publication of JP3633461B2 publication Critical patent/JP3633461B2/en
Application status is Expired - Fee Related legal-status Critical
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Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a configuration of a piezoelectric type ink jet printer head, and more specifically, to prevent ink leakage between a front head unit including a nozzle and an actuator and a main body frame including an ink supply passage. And a method for manufacturing the same.
[0002]
[Prior art]
In the prior art on-demand type piezoelectric ink jet printer head, for example, as described in JP-A-8-276586, a laminated front head unit includes a nozzle plate having a large number of nozzles, A reservoir chamber which is laminated with an adhesive on the back surface thereof and communicates with an ink supply tank, a spacer plate having a first through hole having a diameter larger than that of the nozzle, and a back surface of the spacer plate, which is adhered to the reservoir chamber, An ink supply plate having a communicating orifice and a second through hole communicating with the first through hole; a pressure plate for forming a reinforcing plate and a pressure chamber bonded to the back surface of the ink supply plate; and the pressure The piezoelectric diaphragm is bonded to the back of the chamber. On the other hand, a connection port through which ink from the ink cartridge flows into a plurality of ink supply ports in the front head unit is formed at the bottom of the concave portion of the synthetic resin head case. An edge that surrounds the plurality of ink supply ports and slightly protrudes from the bottom surface on the outer side is formed.
[0003]
The front head unit is fixed with an adhesive in a recess in the lower surface of the head case. In this case, the front head unit is inserted into the recess after applying an adhesive to the bottom surface outside the edge.
[0004]
[Problems to be solved by the invention]
However, in the above-described conventional configuration, even if the head case is an injection-molded product made of synthetic resin, it is not possible to accurately form a recess that matches the outer peripheral shape of the front head unit. Since the accuracy of the flatness of the height of the edge of the tip is not high, when the front head unit is inserted after applying the adhesive to the inner wall surface of the recess, the gap between the edge and the back of the front head unit is inserted. Ink flowing through the intervening adhesive comes into contact. For this reason, from the relationship between the ink component and the adhesive component, the sticky particles are dispersed in the ink to clog the nozzles of the front head unit, or conversely, the ink attacks the adhesive. There is a problem that the so-called sealing property is lowered, that is, ink bubbles are caused to leak outside through the bubbles due to the bubbles trapped inside.
[0005]
Another problem is that the adhesive leaks inward from the gap and the effective area of the ink supply port or the filter stretched on the ink supply port is narrowed by the adhesive.
[0006]
To avoid this problem, an O-ring may be inserted between the connection port and the ink supply port, and the front head unit may be screwed to the head case. In addition, there is a problem in the sealing performance because there is a variation in the fastening force for each screw fixing point, and there is also a problem that the head of the screw protrudes to the front surface of the thin front head unit.
[0007]
Further, in the former case, since the sealing of the connection port and the fixing of the front head unit to the head case are to be performed at one time with one type of adhesive, the orientation of the nozzle of the front head unit There is a problem that it is difficult to accurately align the head with the direction perpendicular to the lower surface of the head case.
[0008]
An object of the present invention is to provide an ink jet printer head and a method for manufacturing the ink jet printer head in which such problems are solved.
[0009]
[Means for Solving the Problems]
In order to achieve this technical problem, an ink jet printer head according to a first aspect of the present invention comprises a plurality of nozzles arranged in a row on the front surface, a pressure chamber for each nozzle, and an ink jet for each pressure chamber. An ink jet printer head in which a front head unit including an actuator for applying energy is fixed to a main body frame having an ink supply passage for supplying ink from an ink supply source to the front head unit. Is formed with an opening of the ink supply passage so as to face an ink supply hole provided on the back surface of the front head unit, and fitted in a fitting groove on the outer periphery of the opening, and the packing The gap between the opening and the supply hole is sealed with a sealing agent filled in the outer peripheral fitting groove.
[0010]
According to a second aspect of the present invention, in the ink jet printer head according to the first aspect, the sealant overflows from the fitting groove due to the pressure applied to the packing by the front head unit, and the front head unit. The fitting groove is filled so as to reach between the body frame.
[0011]
According to a third aspect of the present invention, in the ink jet printer head according to the first aspect, the fitting groove is formed for each opening, and a packing is attached to each fitting groove. is there.
[0012]
According to a fourth aspect of the present invention, in the ink jet printer head according to the first aspect, the fitting groove is formed so as to surround the outer periphery of the plurality of openings, and the packing is provided for each fitting groove. Is installed.
[0013]
According to a fifth aspect of the present invention, in the ink jet printer head according to any one of the first to fourth aspects, a filter for dust filtration is disposed in the opening or the supply hole. is there.
[0014]
According to a sixth aspect of the present invention, there is provided a method of manufacturing an ink jet printer head comprising: a plurality of nozzles arranged in a row on a front surface; a pressure chamber for each nozzle; and an actuator for applying ejection energy to ink for each pressure chamber; An ink jet printer head in which a front head unit is fixed to a main body frame having an ink supply passage for supplying ink from an ink supply source to the front head unit. An opening of the ink supply passage is formed so as to face the ink supply hole provided on the back surface, and a packing is fitted in a fitting groove on the outer periphery of the opening, and the outer periphery of the packing is fitted. After filling the groove with a sealant, the back surface of the front head unit is pressed toward the main body frame to The front head unit is fixed to the main body frame in a state in which the seal agent in the fitting groove overflows and reaches between the front head unit and the main body frame. is there.
[0015]
According to a seventh aspect of the present invention, in the method of manufacturing an ink jet printer head according to the sixth aspect, a filter is attached in advance so as to cover the supply hole in the filter head unit. .
[0016]
The invention according to claim 8 is the method of manufacturing an ink jet printer head according to claim 6 or 7, wherein the bottom plate of the main body frame supports the back surfaces of the plurality of front head units in parallel. Providing a support portion and a space where a plurality of locations on the back surface of the front head unit are exposed, a packing is fitted into the fitting groove, and a sealing agent is fitted into the fitting groove on the outer peripheral side of the packing The plurality of front head units are positioned with respect to each other, the support portions are arranged opposite to the back surfaces of the plurality of front head units, and the plurality of front head units are bonded with the adhesive filled from the voids. The front head unit is fixed to the support portion.
[0017]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. 1, 2, and 3 are perspective views of a piezoelectric ink jet printer head according to an embodiment of the present invention, FIG. 4 is a bottom view of a main body frame 1, and FIG. 6 is a seal of a seal portion of an ink flow path. It is a figure showing work.
[0018]
In these drawings, a main body frame 1 mounted on a known carriage (not shown) that runs along a recording medium is formed in a substantially box shape with an open top from an injection-molded product of a synthetic resin material such as polypropylene or polypropylene. And has a mounting portion 3 to which four ink cartridges (not shown) as ink supply sources can be detachably mounted from above, and each ink cartridge is attached to one side portion 3a of the mounting portion 3. Ink supply passages 4 a, 4 b, 4 c, 4 d that can be connected to two ink discharge portions (not shown) communicate with the lower surface of the bottom plate 5 of the main body frame 1.
[0019]
The bottom plate 5 is formed in a horizontal shape so as to protrude downward from the mounting portion 3, and on the lower surface side of the bottom plate 5, two front head units 6 described in detail later are arranged in parallel. Are formed in a stepped shape. As shown in FIGS. 2, 4 and 5, openings 50, 50, 50, 50 communicating with the ink supply passages 4 a, 4 b, 4 c, 4 d are provided at portions adjacent to the support portions 8. An annular fitting groove 46 is formed so as to surround the outer periphery of each opening 50. However, as shown in FIG. 5, the adjacent fitting grooves 46, 46 may be communicated with each other at a portion where the arrangement interval of the adjacent openings is short, and may be formed in an 8-shaped plan view.
[0020]
Then, ring-shaped packings 47 made of soft rubber or the like with good sealing properties are fitted into the respective fitting grooves 46 (see FIG. 5). In that case, the inner diameter dimension D1 of the packing 47 is set in advance so that the inner peripheral surface 47a of the packing 47 is in close contact with the inner peripheral wall 46a of each of the fitting grooves 46 (so-called tight fit).
[0021]
A plurality of cavities 9a and 9b for fixing the front head unit 6 with a UV adhesive 7 as a fast-curing adhesive penetrate vertically in the support portions 8 and 8 of the bottom plate 5. It is formed as follows.
[0022]
As shown in FIGS. 2 and 7 to 10, the plurality of cavities 9 a and 9 b are formed at locations where the four corners are fixed to one front head unit 6. In a form, in the location where one side (long side in the embodiment) of the two support portions 8 and 8 is adjacent, a space is provided so as to straddle the back surfaces of the two front head units 6 and 6 arranged side by side. 9a and 9a are formed wide.
[0023]
A packing 53 made of rubber or the like (see FIG. 3) is arranged on the upper surface of the one side portion 3a of the mounting portion 3 so as to be in close contact with the ink discharge portion.
[0024]
As shown in FIG. 13, the front head unit 6 includes a plurality of metal plate laminated cavity plates 10 and an adhesive or an adhesive sheet 41 (see FIG. 17) to the cavity plates 10. A plate-type piezoelectric actuator 20 to be bonded and laminated, and a flexible flat cable 40 are laminated on the upper surface of the piezoelectric actuator 20 with an adhesive for electrical connection with an external device. It is assumed that ink is ejected downward from a nozzle 54 opened on the lower surface (front surface) side of the plate 10.
[0025]
Further, an elastic thin metal plate cover plate 44 is fixed along the front surface (lower surface) of the front head unit 6. The cover plate 44 has a hole 44a corresponding to the nozzle 54 at the central portion, and bent portions 44b and 44c are formed along the side surface of the main body frame 1 from the lower surface side of the bottom plate 5 at both ends. 44b covers the lower surface side of the middle part of the flexible flat cable 40.
[0026]
The outer periphery of the cover plate 44 is sealed and fixed to the main body frame 1 with a sealing agent 45 such as a silicone adhesive. That is, between the left and right side edges of the cover plate 44 and the ribs 5a rising on the left and right sides of the bottom plate 5, and between the tip of the other bent portion 44c of the cover plate 44 and the side surface of the main body frame 1, The sealant 45 is filled in a substantially U shape (see FIGS. 10 and 11), and between the inner surface of one bent portion 44b and the flexible flat cable 40 and between the cable 40 and the side surface of the main body frame 1. A sealant 45 is filled in between (see FIG. 10). A gap between the inner periphery of the hole 44 a of the cover plate 44 and the front surface of the front head unit 6 is sealed with an adhesive that bonds the cover plate 44 and the front head unit 6. Thereby, the space between the two front head units 6 is blocked by the cover plate 44, and the space between the main body frame 1 and the outer periphery of the front head unit 6 is sealed via the cover plate 44 and the sealing agent 45. Thus, it is possible to prevent ink, paper dust, dust and the like from entering the gap 9c between the main body frame 1 and the front head unit 6, and an electrical short circuit at the electrical connection portion between the piezoelectric actuator 20 and the flexible flat cable 40. Accidents can be prevented. Further, the one bent portion 44b can guide the pulling direction of the flexible flat cable 40 and can protect the cable 40.
[0027]
Further, as will be described later, on the back surface side of the front head unit 6 and on the upper surface of the supply hole 19a formed in one end portion of the uppermost base plate 14, the ink supplied from the upper ink cartridge is placed. A filter 29 for removing dust is fixed in advance with an adhesive (see FIG. 6A).
[0028]
Next, a method of bonding and fixing the front head unit 6 to the support portion 8 of the bottom plate 5 of the main body frame 1 will be described.
[0029]
First, the cover plate 44 is placed on a jig (not shown) with the front face facing downward, the two front head units 6 and 6 are arranged so that their nozzles 54 correspond to the holes 44a of the cover plate 44, and the nozzles 54 are opened. With the surface (the lower surface (front surface) of the cavity plate 10) facing downward, the front head unit 6 is placed on the cover plate 44 with an adhesive so that the rows of the nozzles 54 are arranged in parallel and at a predetermined interval. Put it on. Thereby, the lower surfaces (front surfaces) of the two front head units 6 and 6 can be arranged on the same plane almost accurately. At this time, the adhesive does not need to fix the front head unit 6 to the cover plate 44 immediately, and may be gradually cured during the following steps.
[0030]
On the other hand, as shown in FIG. 6A, the main body frame 1 is arranged so that the support portion 8 faces upward, and a packing 47 made of rubber or the like is pushed into each fitting groove 46, so that the height of the packing 47 Approximately half to one third of the bottom plate 5 protrudes below the bottom surface of the bottom plate 5, and then an adhesive (sealant) 48 such as silicone resin is filled in each fitting groove 46. Thereafter, the main body frame 1 is covered from above the front head units 6 and 6. At this time, when the front head units 6 are set so as to be accommodated in the stepped recesses of the support portions 8, the lower edge of the rib 5 a of the bottom plate 5 is substantially flush with the lower surface of the cover plate 44. Retained. At that time, the tip of each of the packings 47 comes into contact with the outer peripheral portion of the back surface of the front head unit 6 rather than the filtering portion 29a (corresponding to the ink supply hole 19a) of the filter 29. set. When the main body frame 1 is put on the front head units 6 and 6, the sealing agent 48 is held in the fitting groove 46 by its own viscosity and does not fall. Further, the front head units 6 and 6 can be mounted on the main body frame 1 while being held by a jig (not shown). Next, when one or both of the front head unit 6 and the main body frame 1 are pressed against each other, the inner peripheral surface 47a of each packing 47 is in close contact with the inner peripheral wall 46a of each fitting groove 46, and the packing 47 Each packing 47 sinks into the fitting groove 46 while being in close contact with the outer periphery of the filter 29 so that the front end surrounds the outer periphery from the ink supply hole 19a. Then, the sealing agent 48 in the fitting groove 46 overflows outside the packing 47 in the fitting groove 46, but the tip of the packing 47 is in close contact with the surface of the filter 29 in advance. The agent 48 cannot penetrate into the inner diameter portion of the packing 47, and can be securely sealed by adhering to the back surface of the front head unit 6 at the outer peripheral portion of the packing 47. Therefore, as a result of forming a double sealing portion of the packing 47 and the sealing agent 48 on the outer periphery thereof, the contact portion (joining portion) between the back surface of the outer periphery and the packing 47 from the supply hole 19 a in each front head unit 6. While ensuring that the ink does not leak out, the contact with the sealant 48 is reliably blocked at the location of the packing 47 while the ink flows from the opening 50 to the supply hole 19a, and the ink component This eliminates the problem that particles that clog the nozzle 54 are generated in the ink due to a chemical reaction or the like with the components of the sealant 48, or the sealant 48 is eroded and the sealability is deteriorated.
[0031]
The fitting groove 46 may be provided for each single outer periphery of each opening 50. Further, when a plurality of adjacent supply holes 19a are used as the same color ink, for example, an elliptical fitting in plan view that surrounds these adjacent supply holes 19a, 19a (openings 50, 50) together. A plurality of supply holes 19a and 19a (openings 50 and 50) may be sealed together by forming a joint groove and using an oval packing (not shown) that fits in the fitting groove. Furthermore, a draft may be formed in the inner peripheral wall 46a of the fitting groove 46 from the tip side toward the bottom of the fitting groove.
[0032]
Next, a viscous UV adhesive 7 of a modified acrylic resin adhesive as a fast-curing adhesive is dropped and filled into the spaces 9a and 9b from the upper surface side of the main body frame 1, and then on the main body frame 1. Irradiate ultraviolet rays toward the empty spaces 9a and 9b. Then, the UV adhesive 7 is solidified in a short time (within several tens of seconds).
[0033]
At this time, when the thickness dimension H1a of the front head unit 6 is the thickness from the front surface of the cavity plate 10 to the back surface of the flexible flat cable 40, and the thickness dimension of the cover plate 44 is H1b, the stepped shape If the depth dimension H2 of each support portion 8 is set slightly deeper than H1a + H1b (see FIG. 7), the space between each support portion 8, the flexible flat cable 40, the piezoelectric actuator 20, and the upper surface (rear surface) of the cavity plate 10 will be described. Since a slight gap 9c is formed and the UV adhesive 7 is infiltrated into the gap 9c, it is solidified in units of seconds. Therefore, an extra external force that presses any part of the front head unit 6 with the main body frame 1 does not act. Both can be fixed under the condition. The cover plate 44 does not have rigidity such as holding the two front head units 6 and 6 immovably. Accordingly, the front surface of the cavity plate 10 is kept parallel to the surface of the jig, in other words, the axis of the nozzle 54 (corresponding to the ink ejection direction) can be accurately set in a direction perpendicular to the surface of the jig. In addition, the mutual relationship between the nozzle rows of the two front head units 6 and 6 can be accurately maintained.
[0034]
Further, by arranging the recesses 9a and 9b in the vicinity of the four corners of the front head unit 6 having a rectangular shape in plan view, for example, when the UV adhesive 7 is solidified, the front head unit 6 is subjected to shrinkage distortion of the adhesive. Misalignment can be minimized.
[0035]
By solidifying the vicinity of the four corners of the front head unit 6, the front surface of the cavity plate 10 is brought into close contact with a cap made of rubber or the like in order to prevent the nozzle portion from drying when the ink jet head is not mounted in the printer later. When pressed as much as possible, there is an advantage that deformation such that the plane of the cavity plate 10 is distorted hardly occurs.
[0036]
Furthermore, as shown in FIGS. 4, 7 and 9, when the space 9a is formed wide across the adjacent sides of the front head units 6 and 6 arranged in parallel, one space is provided. The UV adhesive 7 is filled in 9a, and the two units 6 and 6 can be solidified at a time by ultraviolet irradiation, which can contribute to shortening the working speed and greatly improving the production efficiency.
[0037]
As the fast-curing adhesive, a moisture-curing adhesive having a component similar to that of the UV adhesive 7 can be used.
[0038]
Thereafter, as shown in FIGS. 10 and 11, the sealant 45 is formed between the left and right side edges of the cover plate 44 and the rib 5 a and between the tip of the bent portion 44 c of the cover plate 44 and the side surface of the main body frame 1. Apply. The front head is located between the flexible flat cable 40 and the main body frame 1, between the flexible flat cable 40 and the cover plate 44, and between the corner portion of the bent portion 44 c of the cover plate 44 and the main body frame 1. Before the main body frame 1 is put on the unit 6, a sealing agent 45 is applied in advance. Thereby, the outer periphery of the said clearance gap 9c can be sealed completely, and it can prevent that an ink, paper dust, dust, etc. penetrate | invade from the outside.
[0039]
Next, details of each component of the front head unit 6 will be described. The cavity plate 10 is configured as shown in FIGS. That is, the nozzle plate 43, the lower layer plate 11, the two manifold plates 12, the spacer plate 13, and the base plate 14 are each a structure in which five thin metal plates are laminated and bonded together with an adhesive, and in the embodiment, Each plate excluding the nozzle plate 43 is made of 42% nickel alloy steel plate and has a thickness of about 50 μm to 150 μm. In the nozzle plate 43, a large number of nozzles 54 for ejecting ink having a small diameter (in the embodiment, about 25 μm) are arranged in two rows in a staggered manner along the first direction (long side direction) of the nozzle plate 43. It is provided in the shape. Corresponding communication holes 15 are formed in a staggered pattern at intervals of a minute pitch P along two parallel reference lines 11a, 11b extending in the first direction of the lower layer plate 11. In the two manifold plates 12, ink passages 12 a and 12 b are formed so as to extend along both sides of the row of the communication holes 15. However, the ink passage 12b in the lower manifold plate 12 facing the lower layer plate 11 is formed as a recess so as to open only on the upper side of the manifold plate 12 (see FIG. 15). The ink passages 12 a and 12 b are sealed by stacking the spacer plate 13 on the upper manifold plate 12.
[0040]
The base plate 14 is provided with a plurality of narrow pressure chambers 16 extending in a second direction (short side direction) perpendicular to the center line along the long side (first direction). Has been. And when the parallel longitudinal reference lines 14a, 14b are set on both the left and right sides with the center line in between, the tip 16a of the pressure chamber 16 on the left side of the center line is located on the left reference line 14a, Conversely, the tip 16a of the pressure chamber 16 on the right side of the longitudinal center line is positioned on the right reference line 14b on the right side, and the tips 16a of the left and right pressure chambers 16 are alternately arranged. The pressure chambers 16 are alternately arranged so that every other pressure chamber 16 extends in the opposite direction.
[0041]
The front end 16a of each pressure chamber 16 is a through-hole having a small diameter formed in the staggered nozzles 54 of the nozzle plate 43 in the staggered arrangement of the spacer plate 13 and the manifold plates 12 in the same manner. 17, 17, 17 and the communication hole 15. On the other hand, the other end 16 b of each pressure chamber 16 communicates with the ink passages 12 a and 12 b in both the manifold plates 12 through through holes 18 drilled in the left and right side portions of the spacer plate 13.
[0042]
As shown in FIG. 15, the other end 16 b of each pressure chamber 16 is recessed so as to open only on the lower surface side of the base plate 14. A filter 29 for removing dust in the ink supplied from the upper ink cartridge is stretched over the upper surface of the supply hole 19a formed in one end of the uppermost base plate 14.
[0043]
As a result, ink that has flowed into the ink passages 12a and 12b from the supply holes 19a and 19b drilled in one end of the base plate 14 and the spacer plate 13 passes through the through holes 18 from the ink passage 12a. After being distributed in each pressure chamber 16, the pressure chamber 16 passes through the through passages 17, 17, 17 and the communication hole 15 to reach the nozzle 54 corresponding to the pressure chamber 16. (See FIG. 17).
[0044]
On the other hand, the piezoelectric actuator 20 has a structure in which nine piezoelectric sheets 21a, 21b, 21c, 21d, 21e, 21f, 21g, 22, 23 are stacked, as shown in FIGS. Among the piezoelectric sheets, the lowermost piezoelectric sheet 22 and the upper surfaces (wide surfaces) of the odd-numbered piezoelectric sheets 21b, 21d, and 21f counted upward are provided for each location of each pressure chamber 16 in the cavity plate 10. Narrow individual electrodes 24 are formed in a row along a first direction (long side direction), and each individual electrode 24 is formed on each piezoelectric sheet along a second direction orthogonal to the first direction. It extends to the vicinity of the edge of the long side. A common electrode 25 common to the plurality of pressure chambers 16 is formed on the upper surfaces (wide surfaces) of the even-numbered piezoelectric sheets 21a, 21c, 21e, and 21g from the bottom.
[0045]
In the embodiment, the width of each individual electrode 24 is set slightly narrower than the wide portion of the corresponding pressure chamber 16 in plan view.
[0046]
On the other hand, since the pressure chambers 16 are arranged in two rows along the first direction (long side) on the short side central portion side of the base plate 14, the common electrodes 25 are arranged in two rows. Are formed in a substantially rectangular shape in plan view extending along the long side at the center in the short side direction of the even-numbered piezoelectric sheets 21a, 21c, 21e, 21g so as to integrally cover the pressure chambers 16, 16. In the vicinity of the end edges of the pair of short sides of the even-numbered piezoelectric sheets 21a, 21c, 21e, 21g, lead-out portions 25a, 25a extending substantially over the entire length of the end edges are integrally formed.
[0047]
The individual electrodes 24 are disposed on the surface of the even-stage piezoelectric sheets 21a, 21c, 21e, and 21g near the edge of the long side where the common electrode 25 is not formed. A dummy individual electrode 26 having a width substantially the same as that of the individual electrode 24 and a short length is formed at the same vertical position (corresponding position).
[0048]
On the other hand, on the upper surface (wide surface) of the lowermost piezoelectric sheet 22 and the odd-numbered piezoelectric sheets 21b, 21d, 21f counted upward (positions corresponding to the lead portions 25a, 25a (the same vertical position, piezoelectric sheet) The dummy common electrode 27 is formed in the vicinity of the edge of the short side of the pair.
[0049]
On the upper surface of the uppermost top sheet 23, a surface electrode 30 for each of the individual electrodes 24 and a surface electrode 31 for the common electrode 25 are provided along the edge of the long side. Yes.
[0050]
Further, except for the lowermost piezoelectric sheet 22, all the other piezoelectric sheets 21a, 21b, 21c, 21d, 21e, 21f, and 21g and the top sheet 23 have the surface electrodes 30 and the corresponding ones. A through hole 32 is formed so that the individual electrode 24 and the dummy individual electrode 26 at the same position (the same vertical position) communicate with each other. Similarly, the at least one surface electrode 31 (in the embodiment, the surface electrode 31 at the four corners of the top sheet 23) and the corresponding electrode (the same vertical position) at the common electrode 25 or the leading portion 25a are provided. Through holes 33 are formed so as to communicate with each other, and the individual electrodes 24 of each layer and the surface electrodes 30 corresponding to the layers are electrically connected to each other through the conductive material filled in the through holes 32 and 33. In the same manner, the common electrodes 25 of each layer and the surface electrode 31 at the corresponding position are electrically connected to each other.
[0051]
The piezoelectric actuator 20 having the above-described configuration is manufactured by a method as described below. That is, a plurality of piezoelectric sheets 21b, 21d, and 21f in the one piezoelectric actuator 20 are arranged at a location of each piezoelectric sheet on the surface of the first material sheet (ceramic green sheet) formed by arranging them in a matrix. The through-holes 32 are drilled in advance corresponding to the positions where the individual electrodes 24 and the dummy common electrode 27 as the electrode of the discard pattern are provided. Similarly, a plurality of common electrodes 25 are provided on the respective piezoelectric sheets on the surface of a second material sheet (ceramic green sheet) formed by arranging and integrating a plurality of piezoelectric sheets 21a, 21c, 21e, and 21g in a matrix. Then, a through hole 33 is formed in advance corresponding to the position where the dummy individual electrode 26 is provided as an electrode of the discard pattern. Further, in the same manner as described above, a plurality of surface electrodes 30, 31 are provided on the top sheet 23 in the surface of the third material sheet (ceramic green sheet) formed by arranging a plurality of top sheets 23 in a matrix. Through-holes 32 and 33 are drilled at the positions to be provided.
[0052]
The individual electrodes 24 and dummy common electrodes 27 are provided on the surfaces of the piezoelectric sheets 21b, 21d, 21f, and 22, the common electrodes 25 and dummy individual electrodes 26 are provided on the surfaces of the piezoelectric sheets 21a, 21c, 21e, and 21g, and the top sheet 23. When the surface electrodes 30 and 31 are formed on the surface of the substrate by screen printing of the conductive paste, the through holes 32 and 33 penetrate the upper and lower wide surfaces of the first and second material sheets. The conductive paste also enters the through holes 32 and 33, and the conductive portions can be conducted through the through holes 32 and 33 on the upper and lower surfaces of the sheet at the electrode portions. Next, each green sheet is dried, then laminated, and then integrated by pressing in the laminating direction to form a single laminate. Then, it is fired.
[0053]
As a result, the plurality of piezoelectric sheets 21 and the top sheet that are stacked one above the other are electrically connected to the location of the surface electrode 30 with the individual electrodes 24 and the dummy individual electrodes 26 at the same upper and lower positions. The common electrode 25 and the dummy common electrode 27 are electrically connected to the surface electrode 31.
[0054]
Note that side electrodes (not shown) may be formed so that the individual electrodes 24 and the common electrodes 25 are electrically connected to each other on the outer peripheral side surface in the thickness direction of the piezoelectric actuator 20.
[0055]
In the plate-type piezoelectric actuator 20 having such a configuration, the individual electrodes 24 in the piezoelectric actuator 20 correspond to the pressure chambers 16 in the cavity plate 10 with respect to the cavity plate 10. (See FIG. 17). Further, the flexible flat cable 40 is laminated and adhered to the upper surface of the piezoelectric actuator 20, whereby various wiring patterns (not shown) in the flexible flat cable 40 are formed on the surface electrodes 30, 31. Electrically joined to the
[0056]
In this configuration, by applying a voltage between any individual electrode 24 among the individual electrodes 24 in the piezoelectric actuator 20 and the common electrode 25, the individual electrode to which the voltage is applied among the piezoelectric sheets 21 and 22. A distortion in the stacking direction due to piezoelectricity occurs in the portion 24, and the internal volume of the pressure chamber 16 corresponding to each individual electrode 24 is reduced by this distortion, so that the ink in the pressure chamber 16 is transferred to the nozzle 54. Then, the liquid is ejected in the form of droplets (see FIG. 17), and predetermined printing is performed.
[0057]
The front head units to be arranged in parallel can be arbitrarily configured as 2 to 4, and the cavity plate in the front head unit may be a ceramic material in addition to a metal material. Further, the driving means of the ink jet printer of the present invention may be other types of the plate-like piezoelectric actuator 20 described above, or the vibration plate covering the back surface of the pressure chamber is vibrated by static electricity so that ink is ejected from the nozzles 54. It is also possible to discharge from
[0058]
Further, the ink may be supplied from the ink tank outside the carriage to the ink supply paths 4a to 4d via the tube without mounting the ink cartridge on the main body frame 1. Furthermore, the sealing agents 48 and 45 may have an adhesive action.
[0059]
[Operation and effect of the invention]
As described above, the ink jet printer head according to the first aspect of the present invention includes a plurality of nozzles arranged in a row on the front surface, pressure chambers for each nozzle, and ejection energy to the ink for each pressure chamber. In an ink jet printer head formed by fixing a front head unit composed of an actuator to be applied to a main body frame having an ink supply path for supplying ink from an ink supply source to the front head unit, the bottom plate of the main body frame includes: An opening of the ink supply passage is formed so as to face an ink supply hole provided on the back surface of the front head unit, and a packing is fitted in a fitting groove on an outer periphery of the opening, and an outer periphery of the packing The gap between the opening and the supply hole is sealed with a sealing agent filled in the fitting groove on the side.
[0060]
With this configuration, the front end of the packing is in close contact with the periphery of the ink supply hole on the back surface of the front head unit, and the gap between the opening and the ink supply hole is closed. Since the sealing agent is filled on the outer peripheral side of the packing, the sealing agent does not enter the inner peripheral side beyond the packing, and the effective area of the supply hole is not reduced. Since there is no chemical reaction due to contact and no particles or the like that clog the nozzles in the front head unit are generated, the performance of the ink jet printer head is not lowered.
[0061]
According to a second aspect of the present invention, in the ink jet printer head according to the first aspect, the sealant overflows from the fitting groove due to the pressing of the packing by the front head unit. In addition to the effect of the invention according to claim 1, the opening is provided when the front head unit and the main body frame are assembled by filling the fitting groove so as to reach between the unit and the main body frame. The sealing agent can be easily filled between the portion and the supply hole.
[0062]
The invention according to claim 3 is the ink jet printer head according to claim 1, wherein the fitting groove is formed for each opening, and a packing is fitted for each fitting groove. In addition to the effect of the first aspect of the present invention, even when there are a plurality of supply holes in one front head unit, each of the supply holes and openings can be sealed with packing, There is an effect that different colors of ink can be supplied.
[0063]
According to a fourth aspect of the present invention, in the ink jet printer head according to the first aspect, the fitting groove is formed so as to surround the outer periphery of the plurality of openings, and a packing is provided for each fitting groove. If fitted, in addition to the effect of the invention according to claim 1, a plurality of supply holes and openings in one front head unit can be collectively sealed with one packing, and sealing work and configuration Thus, the ink of the common color can be supplied to the plurality of supply holes.
[0064]
According to a fifth aspect of the present invention, in the ink jet printer head according to any one of the first to fourth aspects, a filter for dust filtration is disposed in the opening or the supply hole. is there.
[0065]
According to this structure, in addition to the effect of the invention according to any one of claims 1 to 4, even if dust is present on the ink supply source side, the dust can be removed by the filter, and the inkjet printer head The effect of not degrading the performance of the.
[0066]
According to a sixth aspect of the present invention, there is provided a method of manufacturing an ink jet printer head comprising: a plurality of nozzles arranged in a row on a front surface; a pressure chamber for each nozzle; and an actuator for applying ejection energy to ink for each pressure chamber; An ink jet printer head in which a front head unit is fixed to a main body frame having an ink supply passage for supplying ink from an ink supply source to the front head unit. An opening of the ink supply passage is formed so as to face the ink supply hole provided on the back surface, and a packing is fitted in a fitting groove on the outer periphery of the opening, and the outer periphery of the packing is fitted. After filling the groove with a sealant, the back surface of the front head unit is pressed toward the main body frame to The front head unit is fixed to the main body frame in a state in which the seal agent in the fitting groove overflows and reaches between the front head unit and the main body frame. is there.
[0067]
According to such a manufacturing process, by relatively pressing the front head unit and the main body frame, the inner peripheral surface of the packing is in close contact with the inner peripheral wall of the fitting groove, and the front end of the packing is supplied with ink. The packing sinks into the fitting groove while closely contacting the back surface of the front head unit so as to surround the outer periphery from the hole, and the sealing agent in the fitting groove overflows outside the packing in the fitting groove. Since the front end of the packing is in close contact with the back surface of the front head unit in advance, the sealing agent cannot penetrate into the inner diameter portion of the packing, and adheres to the back surface of the front head unit at the outer peripheral portion of the packing. The effect that it can seal reliably is produced.
[0068]
According to a seventh aspect of the present invention, in the method of manufacturing an ink jet printer head according to the sixth aspect, a filter is attached in advance so as to cover the supply hole in the filter head unit. .
[0069]
If the filter is pasted in advance so as to cover the supply hole in this way, the filter does not move in a delirium, and the sealing performance by the packing and the sealing agent is not hindered.
[0070]
The invention according to claim 8 is the method of manufacturing an ink jet printer head according to claim 6 or 7, wherein the bottom plate of the main body frame supports the back surfaces of the plurality of front head units in parallel. Providing a support portion and a space where a plurality of locations on the back surface of the front head unit are exposed, a packing is fitted into the fitting groove, and a sealing agent is fitted into the fitting groove on the outer peripheral side of the packing The plurality of front head units are positioned with respect to each other, the support portions are arranged opposite to the back surfaces of the plurality of front head units, and the plurality of front head units are bonded with the adhesive filled from the voids. The front head unit is fixed to the support portion.
[0071]
If such a manufacturing process is adopted, the sealing operation of the ink supply hole by the packing and the sealing agent and the fixing operation of the front head unit to the head case can be completed at the same time. In addition to the effects of the invention described in (1), the assembly work efficiency of the ink jet printer head is greatly improved, and the arrangement position error of the front head unit can be extremely reduced.
[Brief description of the drawings]
FIG. 1 is a perspective view with the nozzle side of an inkjet printer head according to an embodiment of the present invention facing up.
FIG. 2 is an exploded perspective view of components of the ink jet printer head.
FIG. 3 is an exploded perspective view of components of the ink jet printer head viewed from above the main body frame.
FIG. 4 is a view of the bottom plate of the main body frame as viewed from the lower surface side.
5 is an enlarged cross-sectional view of each component such as packing as seen in the direction of arrows VV in FIG.
6A is a diagram of a sealing process in which a packing is fitted into a fitting groove of a bottom plate of a main body frame and is filled with an adhesive, and FIG. 6B is a process in a state in which the front head unit is pressed against the packing to be sealed. FIG.
7 is an enlarged cross-sectional view of each component viewed in the direction of arrows VII-VII in FIG. 4;
8 is an enlarged cross-sectional view of each component viewed in the direction of arrows VIII-VIII in FIG. 4;
9 is an enlarged cross-sectional view showing an adhesion portion between the main body frame and the front head unit as seen in the direction of arrows VII-VII in FIG. 4;
10 is an enlarged cross-sectional view showing an adhesion portion between the main body frame and the front head unit as seen in the direction of arrows VIII-VIII in FIG. 4;
FIG. 11 is an enlarged sectional view showing a seal portion between an opening for supplying ink and a supply hole.
FIG. 12 is a perspective view of each part of the front head unit.
FIG. 13 is an enlarged perspective view showing one end portions of a cavity plate and a piezoelectric actuator.
FIG. 14 is an exploded perspective view of a cavity plate.
FIG. 15 is a partially enlarged perspective view of a cavity plate.
FIG. 16 is an exploded perspective view of the piezoelectric actuator.
FIG. 17 is an enlarged side sectional view of the front head unit.
[Explanation of symbols]
1 Body frame
5 Bottom plate
6 Front head unit
7 UV adhesive
8 Supporting part
9a, 9b space
9c gap
10 Cavity plate
11 Lower plate
12a, 12b Manifold plate
13 Spacer plate
14 Base plate
16 Pressure chamber
19a, 19b Ink supply hole
20 Piezoelectric actuator
29 Filter
40 Flexible flat cable
43 Nozzle plate
46 Mating groove
47 Packing
48 Adhesive (sealant)
50 opening
54 nozzles

Claims (8)

  1. A front head unit comprising a plurality of nozzles arranged in a row on the front surface, a pressure chamber for each nozzle, and an actuator for applying ejection energy to the ink for each pressure chamber, from an ink supply source to the front head unit. In an inkjet printer head that is fixed to a main body frame having an ink supply passage for supplying ink,
    An opening of the ink supply passage is formed in the bottom plate of the main body frame so as to face an ink supply hole provided on the back surface of the front head unit, and is fitted into a fitting groove on an outer periphery of the opening. An ink jet printer head characterized in that a gap between the opening and the supply hole is sealed with a sealed packing and a sealing agent filled in a fitting groove on the outer peripheral side of the packing.
  2. The sealing agent is filled in the fitting groove so as to overflow from the fitting groove and reach between the front head unit and the main body frame by pressing the packing by the front head unit. The inkjet printer according to claim 1.
  3. 2. The ink jet printer head according to claim 1, wherein the fitting groove is formed for each opening, and a packing is attached to each fitting groove.
  4. 2. The ink jet printer head according to claim 1, wherein the fitting groove is formed so as to surround an outer periphery of the plurality of openings, and a packing is attached to each fitting groove.
  5. The ink jet printer head according to any one of claims 1 to 4, wherein a filter for dust filtration is disposed in the opening or the supply hole.
  6. A front head unit comprising a plurality of nozzles arranged in a row on the front surface, a pressure chamber for each nozzle, and an actuator for applying ejection energy to the ink for each pressure chamber, from an ink supply source to the front head unit. In an inkjet printer head that is fixed to a main body frame having an ink supply passage for supplying ink,
    An opening of the ink supply passage is formed on the bottom plate of the main body frame so as to face an ink supply hole provided on the back surface of the front head unit, and packing is provided in a fitting groove on an outer periphery of the opening. After the fitting and filling the sealing groove in the outer circumferential side of the packing, the packing is pushed by pressing the back surface of the front head unit toward the main body frame, and the sealing agent in the fitting groove A method of manufacturing an ink jet printer head, wherein the front head unit is fixed to the main body frame in a state where the liquid overflows and reaches between the front head unit and the main body frame.
  7. The method of manufacturing an ink jet printer head according to claim 6, wherein a filter is attached in advance so as to cover the supply hole in the filter head unit.
  8. The bottom plate of the main body frame is provided with a support part for supporting the back surfaces of the plurality of front head units in parallel, and a space where a plurality of back surfaces of the front head units are exposed,
    After fitting the packing into the fitting groove, and filling the sealing groove into the fitting groove on the outer peripheral side of the packing,
    The plurality of front head units are positioned and arranged with respect to each other, the support portions are disposed opposite to the back surfaces of the plurality of front head units, and the plurality of front head units are bonded with an adhesive filled from the space. 8. The method of manufacturing an ink jet printer head according to claim 6, wherein the ink jet printer head is fixed to the support portion.
JP2000260614A 2000-08-30 2000-08-30 Inkjet printer head and manufacturing method thereof Expired - Fee Related JP3633461B2 (en)

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JP2000260614A JP3633461B2 (en) 2000-08-30 2000-08-30 Inkjet printer head and manufacturing method thereof
US09/933,156 US6729717B2 (en) 2000-08-30 2001-08-21 Ink-jet head and method of fabricating same
US10/784,194 US7063405B2 (en) 2000-08-30 2004-02-24 Ink-jet head and method of fabricating same

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US7303271B2 (en) 2003-10-24 2007-12-04 Brother Kogyo Kabushiki Kaisha Ink jet printer
JP4206916B2 (en) 2003-11-28 2009-01-14 ブラザー工業株式会社 Inkjet recording device
US7413295B2 (en) 2004-03-19 2008-08-19 Brother Kogyo Kabushiki Kaisha Inkjet printer with delivery chamber
JP4951911B2 (en) 2005-09-26 2012-06-13 ブラザー工業株式会社 Transportation method of image recording apparatus
US7695095B2 (en) 2005-09-27 2010-04-13 Brother Kogyo Kabushiki Kaisha Image recording apparatus
JP4947257B2 (en) 2005-10-13 2012-06-06 ブラザー工業株式会社 Inkjet head packaging structure
JP5092264B2 (en) 2006-04-05 2012-12-05 ブラザー工業株式会社 Ink cartridge and ink jet recording apparatus
JP2007301880A (en) 2006-05-12 2007-11-22 Brother Ind Ltd Inkjet recording device
JP5029067B2 (en) * 2007-03-01 2012-09-19 ブラザー工業株式会社 Liquid ejection device
US8439494B2 (en) 2007-11-02 2013-05-14 Seiko Epson Corporation Liquid ejecting head, method for making the same, and liquid ejecting apparatus
JP5472574B2 (en) 2008-02-21 2014-04-16 セイコーエプソン株式会社 Liquid ejecting head, manufacturing method thereof, and liquid ejecting apparatus
JP2009196224A (en) 2008-02-21 2009-09-03 Seiko Epson Corp Process for manufacturing liquid jet head
JP4993130B2 (en) * 2008-02-29 2012-08-08 セイコーエプソン株式会社 Liquid ejecting head and liquid ejecting apparatus
JP5019061B2 (en) * 2008-03-06 2012-09-05 セイコーエプソン株式会社 Liquid ejecting head, manufacturing method thereof, and liquid ejecting apparatus
JP2010094973A (en) 2008-09-22 2010-04-30 Seiko Epson Corp Method of manufacturing liquid ejecting head
JP5587268B2 (en) * 2011-09-22 2014-09-10 富士フイルム株式会社 Ink jet head and manufacturing method thereof
JP6274400B2 (en) * 2013-12-06 2018-02-07 セイコーエプソン株式会社 Liquid ejecting head, liquid ejecting head unit, and liquid ejecting apparatus
KR101607664B1 (en) * 2014-07-24 2016-03-31 주식회사 우심시스템 Refill Device of Ink Cartridge

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