JP3812344B2 - Inkjet printer head manufacturing method - Google Patents

Inkjet printer head manufacturing method Download PDF

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Publication number
JP3812344B2
JP3812344B2 JP2001023776A JP2001023776A JP3812344B2 JP 3812344 B2 JP3812344 B2 JP 3812344B2 JP 2001023776 A JP2001023776 A JP 2001023776A JP 2001023776 A JP2001023776 A JP 2001023776A JP 3812344 B2 JP3812344 B2 JP 3812344B2
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Japan
Prior art keywords
front head
plurality
front
plate
head units
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JP2001023776A
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Japanese (ja)
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JP2002144590A (en
Inventor
敦 伊藤
淳 廣田
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ブラザー工業株式会社
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Priority to JP2000-260617 priority Critical
Priority to JP2000260617 priority
Application filed by ブラザー工業株式会社 filed Critical ブラザー工業株式会社
Priority to JP2001023776A priority patent/JP3812344B2/en
Priority claimed from US09/933,156 external-priority patent/US6729717B2/en
Publication of JP2002144590A publication Critical patent/JP2002144590A/en
Publication of JP3812344B2 publication Critical patent/JP3812344B2/en
Application granted granted Critical
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Description

[0001]
BACKGROUND OF THE INVENTION
  The present invention relates to a configuration of an inkjet printer head such as a piezoelectric type, and more specifically, a front head unit including a nozzle and an actuator is firmly and quickly and accurately attached to a main body frame including an ink supply passage.Manufacturing method that can be fixedIt is about.
[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 This is composed of a piezoelectric diaphragm bonded to the back of the chamber. Fixed by an adhesive to the lower surface of the recess of Dokesu. This head case is formed with an ink flow path for allowing ink from an ink cartridge, which will be described later, to flow into the front head unit. It was configured to be screwed to the lower surface of the main body frame that can be mounted on.
[0003]
[Problems to be solved by the invention]
  However, in the above 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 gap between the wall surface and the outer periphery and the back surface of the front head unit is filled with the adhesive, it is difficult to accurately align the nozzle direction of the front head unit with the direction perpendicular to the lower surface of the head case. There was a problem. When a plurality of the front head units are arranged side by side, if errors in parallelism and spacing between the nozzle rows in one front head unit and the nozzle rows in the other front head unit adjacent to each other increase, a recording medium such as paper Therefore, it is necessary to fix the plurality of front head units to the head case so that errors in parallelism and arrangement intervals are reduced.
[0004]
  Furthermore, if the curing speed of the adhesive is slow, the jig for holding the position and posture must be restrained for a long time in order to fix the front head unit to the head case, and the efficiency of the assembly work is also deteriorated. There was also a problem.
[0005]
  The present invention provides an ink jet printer head that solves such problems.Manufacturing methodIt is a technical subject to provide
[0006]
[Means for Solving the Problems]
  In order to achieve this technical problem, according to the first aspect of the present invention, a plurality of nozzles arranged in a row on the front surface, a pressure chamber for each nozzle, and jet energy are applied to the ink for each pressure chamber. Front head unit consisting of actuatorTo the body frameInkjet printer headManufacturing methodIn the bottom plate of the main body frame,pluralFront head unitThe opposite side of the frontThe back ofIn parallelA support portion for supporting, and a space where a plurality of locations on the back surface of the front head unit are exposed.After arranging and arranging the plurality of front head units by positioning the interrelationships of the nozzle rows of the plurality of front head units, the support portions are arranged opposite to the back surfaces of the plurality of front head units, An adhesive is filled from the void, and the plurality of front head units are fixed to the support portion.
[0007]
  And the invention of Claim 2 is2. The method of manufacturing an ink jet printer head according to claim 1, wherein the space is provided through the bottom plate so as to open to the side opposite to the support portion of the bottom plate.
[0008]
  The invention according to claim 33. The method of manufacturing an ink jet printer head according to claim 1, wherein the plurality of front head units are positioned on a jig so that the mutual relationship between the rows of the nozzles is positioned, and the front surfaces of the plurality of front head units are arranged. The main body frame is placed so as to face the jig, and the main body frame is arranged so that the support portions face the back surfaces of the plurality of front head units.
[0009]
  Furthermore, the invention described in claim 44. The method of manufacturing an ink jet printer head according to claim 1, wherein the adhesive is a UV adhesive.
[0010]
  The invention described in claim 55. The method of manufacturing an ink jet printer head according to claim 1, wherein the voids are provided so as to correspond to the vicinity of the four corners of one front head unit.
[0011]
  The invention described in claim 66. The method of manufacturing an ink jet printer head according to claim 1, further comprising a cover plate having an opening on a front surface of the plurality of front head units, and positioning the plurality of front head units relative to each other. The cover plate is disposed on the front surface thereof, and the support portion is disposed opposite to the cover plate.
[0012]
  The invention described in claim 77. The method of manufacturing an ink jet printer head according to claim 1, wherein a supply hole for supplying ink to the nozzle is provided on a back surface of each front head unit. When the front head unit is fixed to the support portion, an ink supply passage provided in the main body frame is connected to the supply hole.
[0013]
  And the invention of claim 8 is8. The method of manufacturing an ink jet printer head according to claim 1, wherein the space is positioned so as to straddle the back surfaces of two adjacent front head units among the plurality of front head units. It is characterized by that.
[0014]
  The invention according to claim 9 is4. The method of manufacturing an inkjet printer head according to claim 3, wherein each front head unit is provided with positioning holes in front and rear portions of the nozzle row or in the vicinity thereof, and the plurality of front head units are attached to the jig. When placing on the jig, the positioning holes are fitted into the positioning pins protruding from the jig, respectively. It is characterized by positioning the mutual relationship between the rows of sulls.
[0015]
  The invention according to claim 10 is:10. The method of manufacturing an ink jet printer head according to claim 9, wherein each front head unit has a structure in which a plurality of plates are stacked, and a plate in which the nozzle is perforated is positioned on the plate. The hole is formed in the same process.
[0016]
  The invention according to claim 11In the method of manufacturing an ink jet printer head according to claim 9 or 10, each front head unit has a structure in which a plurality of plates are stacked, and among the plates, the plate in which the nozzle is perforated, The positioning hole is drilled, and the lower layer plate adjacent to the positioning hole is connected to the positioning hole and has a relief hole having a diameter larger than that of the positioning hole. It is characterized by being drilled as a hole.
[0017]
[0018]
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 inkjet printer head according to an embodiment of the present invention, and FIG. 4 is a bottom view of the main body frame 1.
[0019]
  In these drawings, a main body frame 1 mounted on a known carriage (not shown) that runs along a recording medium is an injection-molded product of a synthetic resin material such as polypropylene or polypropylene, and has a substantially box shape with an open top surface. It is formed, four from the topink cartridgeThe mounting portion 3 can be detachably mounted, and one side portion 3a of the mounting portion 3 includesink cartridgeInk supply passages 4 a, 4 b, 4 c, and 4 d that can be connected to the ink discharge portion (not shown) communicate with the lower surface of the bottom plate 5 of the main body frame 1. A rubber packing (not shown) is provided 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.
[0020]
  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. A plurality of cavities 9 a and 9 b for fixing with the UV adhesive 7 are formed in the respective support portions 8 so as to penetrate vertically.
[0021]
  As shown in FIG. 12, 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. 16) with respect to the cavity plates 10. A plate-type piezoelectric actuator 20 to be bonded and laminated, and a flexible flat cable 40 are overlapped and bonded to each other on an upper surface of the piezoelectric actuator 20 with an adhesive. It is assumed that ink is ejected downward from a nozzle 54 opened in the lowermost nozzle plate 43 as described later.
[0022]
  Next, details of each component of the front head unit 6 will be described. The first embodiment of the cavity plate 10 is configured as shown in FIGS. 13, 14, 15 and 16. That is, it is a structure in which five thin plate-like materials of the nozzle plate 43, the lower layer plate 11, the two manifold plates 12, the spacer plate 13, and the base plate 14 are laminated and bonded together with an adhesive. 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.
[0023]
  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. The nozzle plate 43 has a pair of front and rear for fixing a plurality of front head units 6 and 6 side by side with high accuracy at or near the front and rear portions of the row of nozzles 54, as will be described later. Positioning holes 55 and 55 are formed with a distance of L1 (see FIG. 14).
[0024]
  Since the nozzle 54 and the positioning holes 55, 55 are formed in the same process by laser processing, press processing, etc., for example, the positions of the positioning holes 55, 55 with respect to a straight line connecting the rows of the nozzles 54 have a predetermined high accuracy. Is drilled. Further, if the positioning holes 55 and 55 are too close to the front end and rear end of the row of nozzles 54, ink droplets accompanying the printing operation may be collected in the positioning hole 55. It is assumed that the distance from the subsequent positioning hole 55 to the nearest nozzle 54 is drilled at a position about 1 mm apart.
[0025]
  The communication holes 15 corresponding to the nozzles 54 are formed in a staggered pattern at intervals of a minute pitch P along two parallel reference lines 11a and 11b extending in the first direction of the lower layer plate 11. Yes. Ink passages 12 a and 12 b are formed in the two manifold plates 12 and 12 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 to the upper side of the manifold plate 12 (see FIG. 14). The ink passages 12 a and 12 b are sealed by stacking the spacer plate 13 on the upper manifold plate 12.
[0026]
  The lower plate 11 and the lower manifold plate 12 are provided with relief holes 56 communicating with the positioning holes 55 (see FIG. 14). The diameters of the relief holes 56 are larger than those of the positioning holes 55. The large relief hole 56 is formed as a blind hole that does not reach the upper manifold plate 12 or the spacer plate 13. As a result, even if ink has entered from each of the positioning holes 55, the ink does not reach the position of the piezoelectric actuator 20 described later, and it is considered that there is no electrical short circuit accident due to the ink liquid.
[0027]
  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.
[0028]
  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. In these cases, the diameters of the communication hole 15 and the through passage 17 are set to be considerably larger than the diameter of the nozzle 54. 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.
[0029]
  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. Further, the upper surface of the supply hole 19a formed in one end portion of the uppermost base plate 14 has an upper portion thereof.ink cartridgeA filter 29 for removing dust in the ink supplied from the printer is stretched.
[0030]
  As a result, the ink that has flowed into the ink passages 12a and 12b from the supply holes 19a and 19b formed 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 FIGS. 15 and 16).
[0031]
  The piezoelectric actuator 20 has a structure in which nine piezoelectric sheets 21a, 21b, 21c, 21d, 21e, 21f, 21g, 22 and a top sheet 23 are laminated, 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.
[0032]
  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.
[0033]
  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.
[0034]
  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. The dummy individual electrodes 26 having the same width as the individual electrodes 24 and a short length are formed at the same vertical position (corresponding position).
[0035]
  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.
[0036]
  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.
[0037]
  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 electrodes 31 at the four corners of the top sheet 23), and the extraction portion 25a and the dummy common electrode 27 at the corresponding positions (the same vertical position) 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. Similarly, the common electrodes 25 of each layer and the surface electrodes 31 at the corresponding positions are electrically connected to each other (see FIGS. 13 and 17). ).
[0038]
  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 drilled 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.
[0039]
  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.
[0040]
  As a result, the plurality of piezoelectric sheets 21 and the top sheet 23 stacked vertically are electrically connected to the position of the surface electrode 30 with the individual electrodes 24 and the dummy individual electrodes 26 at the same upper and lower positions. A plurality of common electrodes 25 and dummy common electrodes 27 are electrically connected to the surface electrode 31.
[0041]
  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.
[0042]
  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 FIGS. 12 and 13). 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
[0043]
  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 24 to which the voltage is applied in the piezoelectric sheet 21 is applied. A distortion in the stacking direction due to piezoelectricity occurs in the portion, 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 discharged from the nozzle 15 to the liquid. A predetermined printing is performed by ejecting droplets (see FIG. 16).
[0044]
  Next, a method for fixing the plurality of front head units 6 and 6 in parallel to the support portion 8 of the bottom plate 5 of the main body frame 1 will be described. As shown in FIGS. 2 to 8, the plurality of cavities 9 a and 9 b are formed at locations that fix the vicinity of the four corners of one front head unit 6. In the place where one side (long side in the embodiment) of the two support portions 8 and 8 is adjacent, the spaces 9a and 9a are widened so as to straddle the back surfaces of the two front head units 6 and 6 arranged side by side. To form.
[0045]
  First, in order to arrange the two front head units 6 and 6 side by side, four positioning pins 57 and 57 are projected in advance on the jig 42 plate. In that case, it is necessary to accurately set the nozzles 54 and 54 rows in the two nozzle plates 43 and 43 so that they are parallel to each other. Therefore, two front and rear positioning pins 57 and 57 are protruded so as to correspond to the positioning holes 55 and 55 that are formed in the front and rear portions of one nozzle plate 43 by a distance L1 (see FIG. 6). Further, in order to maintain the parallelism when the interval between the nozzles 54 and 54 rows in the two nozzle plates 43 and 43 is L2, the positioning pins 57 and 57 are protruded with an interval of L2 (see FIG. 5).
[0046]
  The portion 42a around the positioning pins 57, 57 on which the nozzle plate 43 is placed in the jig 42 protrudes higher than the other portions, and is smaller than the opening 44a of the cover plate 44 in plan view. First, the cover plate 44 is placed on the jig 42 so that the protruding portion 42a is inserted into the opening 44a.
[0047]
  Next, the nozzle plate 43 of each front head unit 6 is faced down so as to face the protruding portion 42 a of the plate-like jig 42, and the front and rear portions of the nozzle 54 row provided in each nozzle plate 43 are drilled. The provided positioning holes 55, 55 are fitted into the corresponding positioning pins 57, 57 (see FIG. 10A and FIG. 11). Thereby, both the nozzles 54 and 54 row | line | columns in the two front head units 6 and 6 are parallel, and the front-back position of a nozzle row | line | column is set so that it may not shift | deviate back and forth (refer Fig.10 (a)).
[0048]
  Even if the height dimension of the positioning pin 57 is higher than the thickness dimension of the nozzle plate 43, the escape hole 56 is formed in the plate (lower layer plate 11) adjacent to the nozzle plate 43. The front end of the positioning pin 57 cannot be held by the plate, and both the positioning pin 57 and the positioning hole 55 have the same diameter so that they do not rattle. The state of being in contact with the surface can be maintained, and the axis line (corresponding to the ink ejection direction) of the nozzles 54 arranged side by side can be accurately set in a direction orthogonal to the surface of the jig 42. In addition, by setting the diameter of the relief hole 56 to be larger than the diameter of the positioning hole 55 (positioning pin 57), the lateral displacement of each plate during the stacking operation of the plates 43, 11, 12, 13, and 14 in the cavity plate 10 is determined. Even if there is a slight error, the entire positioning pin 57 can penetrate the positioning hole 55.
[0049]
  Next, the main body frame 1 is placed over the front head units 6 and 6. At that time, when the front head units 6 are set so as to be housed 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 nozzle plate 43. Retained. Next, a UV adhesive 7 having a viscosity of a modified acrylic resin adhesive as a fast-curing adhesive is applied to each of the voids 9a and 9b from the upper surface side of the main body frame 1 as indicated by a downward arrow in FIG. After dropping and filling, ultraviolet rays are irradiated from above the main body frame 1 toward the spaces 9a and 9b. Then, the UV adhesive 7 is solidified in a short time (within several tens of seconds).
[0050]
  At this time, when the thickness dimension H1a of the front head unit 6 is the thickness from the front surface of the nozzle plate 43 to the back surface of the flexible flat cable 40 in the cavity plate 10, the depth dimension of each stepped support portion 8 is set. When H2 is set slightly deeper than H1a (see FIG. 5), a slight gap 9c is formed between each support portion 8 and the flexible flat cable 40, the piezoelectric actuator 20, and the upper surface (back surface) of the cavity plate 10 ( 7 and FIG. 8), since the UV adhesive 7 penetrates into the gap 9c and solidifies in units of seconds, 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.
[0051]
  Accordingly, the axis of the nozzle 54 (corresponding to the ink ejection direction) can be accurately set in a direction orthogonal to the surface of the jig 42, and the mutual relationship between the nozzle rows of the two front head units 6 and 6 Can be maintained accurately.
[0052]
  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.
[0053]
  Further, by solidifying the vicinity of the four corners of the front head unit 6, the front surface of the cavity plate 10 is covered with a cap made of rubber or the like to prevent the nozzle portion from drying when the ink jet head is not mounted in the printer later. There is an advantage that deformation that causes distortion of the plane of the cavity plate 10 is less likely to occur when pressed so as to be in close contact.
[0054]
  Further, as shown in FIGS. 5 and 7, when the space 9a is formed wide across the adjacent sides of the front head units 6 and 6 arranged in parallel, the UV is formed in one space 9a. By filling the adhesive 7 and irradiating with ultraviolet rays, the two units 6 and 6 can be solidified at a time, which can contribute to shortening the working speed and greatly improving the production efficiency.
[0055]
  As the fast-curing adhesive, a moisture-curing adhesive having a component similar to that of the UV adhesive 7 can be used.
[0056]
  A space between the front head unit 6, the cover plate 44, and the main body frame 1 is filled with a sealing agent 45. In addition, between the front head unit 6 and the cover plate 44, when the front head unit 6 is opposed to the cover plate 44, it is applied in advance to either the cover plate 44 or the opposing surface of the lower layer plate 11 of the front head unit 6. The adhesive / sealant thus prepared is interposed.
[0057]
  That is, as shown in FIGS. 7 to 9, between the left and right edges of the cover plate 44 made of an elastic thin metal plate and the rib 5a, the tip of the bent portion 44c of the cover plate 44, and the body frame 1 A sealant 45 is applied between the side surfaces. 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. As a result, the outer periphery of the gap 9c can be completely sealed, and ink, paper dust, dust and the like can be prevented from entering from the outside.
[0058]
  The cover plate 44 has a hole 44a corresponding to the nozzle plate 43 in 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. The bent portion 44b covers the lower surface side of the middle portion of the flexible flat cable 40.
[0059]
  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, Sealing agent 45 is filled in a substantially U shape (FIGS. 7 and 9), and between the inside 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. Each is filled with a sealing agent 45 (see FIG. 8). The inner periphery of the hole 44 a of the cover plate 44 and the front surface of the front head unit 6 are sealed with an adhesive (sealant) 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.
[0060]
  As shown in FIGS. 2 and 9, the outer periphery of the communicating portion of the ink supply passages 4a, 4b, 4c, and 4d in the main body frame 1 to the lower surface of the bottom plate 5 of the main body frame 1 has an eight-letter shape in plan view. A fitting groove 46 such as a recess is formed, and a ring-shaped rubber packing 47 is inserted into the fitting groove 46 and filled in advance with a sealant 45 such as silicone resin. When the front head unit 6 and the main body frame 1 are bonded and fixed together, the tip of each packing 47 is simultaneously pressed against the outer periphery of each supply hole 19a, so that the sealing agent 45 also contacts the front head unit 6 and is supplied. The sealing part with the hole 19a (filter 29) can be sealed.
[0061]
  FIG. 18 shows a second embodiment of the cavity plate 10. The difference from the cavity plate 10 of the first embodiment is that the lower layer plate 11 is omitted, and the other forms, configurations, operations and effects are the same. Therefore, the same reference numerals are given and detailed description is omitted. And the positioning hole in the nozzle plate 4355The escape hole 56 as a blind hole communicating with the upper manifold plate 12 is formed only in the lower manifold plate 12 and the upper manifold plate 12, and the escape hole 56 is not formed in the spacer plate 13 and the base plate 14. Similar to the embodiment, the positioning hole55Even if the ink enters from the side, it is blocked by the spacer plate 13 and the base plate 14, and the ink does not penetrate into the portion of the piezoelectric actuator 20 on the back surface side, so that an electrical short circuit accident does not occur.
[0062]
  The number of front head units to be arranged in parallel can be arbitrarily set to 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 have a configuration in which the liquid is discharged from the liquid. Alternatively, ink may be supplied from the ink tank other than the carriage to the ink supply paths 4a to 4b via the tube without mounting the ink cartridge on the main body frame 1.
[0063]
[Operation and effect of the invention]
  As described above, the invention according to claim 1IsFront 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 ink for each pressure chamberTo the body frameInkjet printer headManufacturing methodIn the bottom plate of the main body frame,pluralFront head unitThe opposite side of the frontThe back ofIn parallelA support portion for supporting, and a space where a plurality of locations on the back surface of the front head unit are exposed.The plurality of fronts After positioning the plurality of front head units by positioning the mutual relationship between the nozzle rows of the head unit, the support portions are arranged opposite to the back surfaces of the plurality of front head units, and the adhesive is filled from the voids. The plurality of front head units are fixed to the support portion.
[0064]
  If such a manufacturing method is adopted, the main body frame can be filled with the adhesive from the back surface of each front head unit while maintaining the level accuracy of the front surfaces of the front head units and the parallelism of the nozzle rows accurately. The assembly accuracy of the inkjet printer head can be greatly improved.
[0065]
  According to the second aspect of the present invention, the adhesive can be quickly fixed by filling the gap between the back surface of the front head unit and the wall surface of the bottom plate with a space, and the position of the front head unit can be arranged. There is an effect that the error can be extremely small.
[0066]
  According to the invention described in claim 3, the plurality of front head units are positioned on the jig, the mutual relationship of the nozzle rows is positioned, and the front surfaces of the plurality of front head units are opposed to the jig. Since the main body frame is disposed in such a state that the support portion faces the back surface of the plurality of front head units, the front head unit is simply fixed to the main body frame with an adhesive. As a result, the nozzle rows of a plurality of front head units arranged side by side are parallel to each other, and arrangement errors can be eliminated.
[0067]
  According to the invention of claim 4, since the adhesive is a UV adhesive, it is fast-curing, and solidification is completed in an extremely short time in seconds, so that the assembly work efficiency is greatly increased. There is an effect of improving.
[0068]
  According to the invention described in claim 5, the space is provided so as to correspond to the vicinity of the four corners of one front head unit..
  In this way, when the adhesive is fixed in the spaces corresponding to the four corners of one front head unit, the positional deviation of the front head unit due to the shrinkage distortion of the adhesive is minimized when the adhesive is solidified. When the ink jet head is not installed in a state where the ink jet head is mounted on the printer, when the front surface of the cavity plate is pressed closely with a rubber cap to prevent the nozzle portion from drying, the plane of the cavity plate There is an advantage that deformation that distorts becomes difficult to occur.
[0069]
  According to the invention described in claim 6, the front plate of the plurality of front head units is further provided with a cover plate having an opening, the plurality of front head units are positioned and arranged mutually, and the cover plate is disposed on the front surface thereof. Since it arranges and the said support part is arranged opposite to them,As described above, the arrangement error of the plurality of front head units can be reduced, and the gap between them can be closed with the cover plate to prevent entry of dust or the like.
  According to the seventh aspect of the present invention, when the plurality of front head units are fixed to the support portion, a supply hole provided in the back surface of each front head unit, an ink supply passage provided in the main body frame, Can be connected.
[0070]
  According to invention of Claim 8, since the said space is located so that the back surface of two adjacent front head units among these front head units may be straddled.,If an adhesive is filled in a space straddling the adjacent support portion, the back surface portion of the adjacent front head unit can be fixed at the same time, and the assembly work efficiency is further improved.
[0071]
  According to the ninth aspect of the present invention, each front head unit is provided with positioning holes in front and rear portions of the nozzle row or in the vicinity thereof, and the plurality of front head units are mounted on the jig. The positioning holes are fitted into positioning pins projecting from the jig to position the mutual relationship between the nozzle rows.
[0072]
  Therefore, when the nozzle plate is set to face the jig for each front head unit, the nozzle plate is accurately positioned and positioned through the positioning holes in the nozzle plate before and after the nozzle row with respect to the positioning pins in the jig. Since it can be set easily, simply by fixing the front head unit to the main body frame with an adhesive in this state, the nozzle rows of a plurality of front head units arranged in parallel can be arranged in parallel with each other, eliminating arrangement errors. it can. Further, the configuration for positioning is extremely simple, and there is an effect that no protruding portion remains on the ink jet head side.
  Furthermore, after fixing a plurality of front head units to the main body frame, it is only necessary to remove the nozzle plate from the positioning pins in the jig, so that the working efficiency is improved.
[0073]
  Invention of Claim 10According to the above, each front head unit has a structure in which a plurality of plates are stacked, and the nozzle and the positioning hole are drilled in the same step in the plate in which the nozzle is drilled. It is characterized by this.
[0074]
  Therefore, compared with the case where the nozzle and the positioning hole are formed in separate steps, the mutual positional error is reduced, and the arrangement error of the parallel arrangement of the plurality of front head units can be reduced accordingly.
[0075]
  According to an eleventh aspect of the present invention, each front head unit has a structure in which a plurality of plates are stacked, and the positioning hole is formed in a plate in which the nozzle is formed. The lower plate adjacent to the plate is provided with a relief hole communicating with the positioning hole and having a diameter larger than that of the positioning hole as a blind hole that does not reach the upper plate. It is a feature.
[0076]
  Therefore, when assembling the front head unit in a laminated form, even if there is some lateral displacement between the nozzle plate and the adjacent plate, the positioning pin cannot be used as a blind hole, and in the unlikely event that the ink is printed Even if the ink enters the blind hole through the positioning hole, the ink does not enter the actuator side, and an electrical short circuit accident does not occur.
[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.
FIG. 5 is an enlarged cross-sectional view of each component as viewed in the direction of arrows VV in FIG. 4;
FIG. 6 is an enlarged cross-sectional view of each component viewed in the direction of arrows VI-VI in FIG. 4;
7 is an enlarged cross-sectional view showing a bonding portion between the main body frame and the front head unit as seen in the direction of arrows VV in FIG. 4;
8 is an enlarged cross-sectional view showing a bonding portion between the main body frame and the front head unit as seen in the direction of arrows VI-VI in FIG. 4;
FIG. 9 is an enlarged cross-sectional view illustrating a bonding portion between a main body frame and a front head unit in an ink supply passage portion.
10A is a side view of a state in which a front head unit is positioned on a jig, and FIG. 10B is a cross-sectional view of a state in which the main body frame is covered.
FIG. 11 is an enlarged cross-sectional view of a main part showing a positional relationship between a positioning pin, a positioning hole, and a relief hole as a blind hole in a positioning state.
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 enlarged side sectional view of the front head unit.
FIG. 17 is an exploded perspective view of a piezoelectric actuator.
FIG. 18 is an exploded perspective view of a cavity plate according to a second embodiment.
[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
  12,12 Manifold plate
  13 Spacer plate
  14 Base plate
  16 Pressure chamber
  20 Piezoelectric actuator
  40 Flexible flat cable
  42 Jig
  43 Nozzle plate
  54 nozzles
  55 Positioning hole
  56 Relief hole as a blind hole
  57 Positioning pin

Claims (11)

  1. An inkjet printer head for fixing a front head unit comprising a plurality of nozzles 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 to a main body frame . In the manufacturing method ,
    The bottom plate of the body frame, the front and a support portion for supporting the back surface opposite to the parallel form of the plurality of front head unit, and a cavity in which a plurality of locations of the rear surface of the front head unit is exposed Set up
    After positioning the plurality of front head units by positioning the interrelationship between the rows of nozzles of the plurality of front head units, the support portion is disposed opposite to the back surface of the plurality of front head units,
    A method of manufacturing an ink jet printer head , comprising filling an adhesive from the void and fixing the plurality of front head units to the support portion .
  2. 2. The method of manufacturing an ink jet printer head according to claim 1, wherein the space is provided through the bottom plate so as to open to the side opposite to the support portion of the bottom plate .
  3. The plurality of front head units are placed on a jig, the mutual relationship between the nozzle rows is positioned, and the front surfaces of the plurality of front head units are placed facing the jig.
    3. The method of manufacturing an ink jet printer head according to claim 1, wherein the main body frame is disposed so that the support portion faces the back surface of the plurality of front head units .
  4. 4. The method of manufacturing an ink jet printer head according to claim 1, wherein the adhesive is a UV adhesive.
  5. 5. The method for manufacturing an ink jet printer head according to claim 1, wherein the voids are provided so as to correspond to the vicinity of the four corners of one front head unit.
  6. Further comprising a cover plate having an opening in front of the plurality of front head units,
    6. The plurality of front head units are positioned and arranged with respect to each other, the cover plate is arranged on a front surface thereof, and the support portion is arranged so as to face the cover plate. Inkjet printer head manufacturing method.
  7. On the back surface of each front head unit, a supply hole for supplying ink to the nozzle is provided,
    The ink supply path provided in the main body frame is connected to the supply hole when the plurality of front head units are fixed to the support portion. Inkjet printer head manufacturing method.
  8. The said empty space is located so that it may straddle the back surface of two adjacent front head units among these front head units, The one of Claim 1 thru | or 7 characterized by the above-mentioned. Inkjet printer head manufacturing method .
  9. Each front head unit is provided with positioning holes in front and rear portions of the nozzle row or in the vicinity thereof,
    When placing the plurality of front head units on the jig, the positioning holes are respectively fitted to positioning pins protruding from the jig,
    4. The method of manufacturing an ink jet printer head according to claim 3, wherein the mutual relation between the nozzle rows is positioned.
  10. Each of the front head units has a structure in which a plurality of plates are laminated, and the plate in which the nozzle is drilled is positioned on the plate. 10. The method of manufacturing an ink jet printer head according to claim 9, wherein the holes are formed in the same process.
  11. Each of the front head units has a structure in which a plurality of plates are laminated. Of the plates, the plate having the nozzles is provided with the positioning hole, and the lower plate adjacent to the plate is provided with the positioning hole. 11. The escape hole having a diameter larger than that of the positioning hole and communicating with the positioning hole is formed as a blind hole that does not reach the upper layer plate. A method for manufacturing the inkjet printer head according to claim.
JP2001023776A 2000-08-30 2001-01-31 Inkjet printer head manufacturing method Active JP3812344B2 (en)

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Application Number Priority Date Filing Date Title
JP2000-260617 2000-08-30
JP2000260617 2000-08-30
JP2001023776A JP3812344B2 (en) 2000-08-30 2001-01-31 Inkjet printer head manufacturing method

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Application Number Priority Date Filing Date Title
JP2001023776A JP3812344B2 (en) 2000-08-30 2001-01-31 Inkjet printer head manufacturing method
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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JP2004174827A (en) 2002-11-26 2004-06-24 Brother Ind Ltd Ink jet printer head and its head unit
JP4288981B2 (en) 2003-03-28 2009-07-01 ブラザー工業株式会社 Inkjet head manufacturing method
JP4539029B2 (en) * 2003-05-23 2010-09-08 セイコーエプソン株式会社 Manufacturing method of liquid ejecting apparatus
JP2005081545A (en) 2003-09-04 2005-03-31 Brother Ind Ltd Inkjet printer head
JP4539123B2 (en) * 2004-03-04 2010-09-08 ブラザー工業株式会社 Inkjet printer head and manufacturing method thereof
JP5050521B2 (en) 2006-01-19 2012-10-17 セイコーエプソン株式会社 Liquid ejecting head and liquid ejecting apparatus
JP2007223075A (en) 2006-02-21 2007-09-06 Brother Ind Ltd Inkjet printer and method for manufacturing the same
JP4591522B2 (en) 2008-02-29 2010-12-01 ブラザー工業株式会社 Liquid discharge head and manufacturing method thereof
JP4957832B2 (en) * 2010-05-19 2012-06-20 セイコーエプソン株式会社 Method for manufacturing liquid ejecting apparatus and liquid ejecting apparatus
JP5831692B2 (en) * 2011-08-31 2015-12-09 セイコーエプソン株式会社 Liquid ejecting head and liquid ejecting apparatus
JP6197448B2 (en) * 2013-03-27 2017-09-20 セイコーエプソン株式会社 Liquid ejecting head and liquid ejecting apparatus
JP6299072B2 (en) 2013-03-27 2018-03-28 セイコーエプソン株式会社 Liquid ejecting head and liquid ejecting apparatus
JP6361131B2 (en) 2013-12-24 2018-07-25 セイコーエプソン株式会社 Liquid ejecting head, liquid ejecting apparatus, and method of manufacturing liquid ejecting head
JP6213605B2 (en) * 2016-04-20 2017-10-18 セイコーエプソン株式会社 Liquid jet head

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