WO2012165321A1 - インクジェットヘッドの製造方法、インクジェットヘッド、部材間通電構造の製造方法及び部材間通電構造 - Google Patents
インクジェットヘッドの製造方法、インクジェットヘッド、部材間通電構造の製造方法及び部材間通電構造 Download PDFInfo
- Publication number
- WO2012165321A1 WO2012165321A1 PCT/JP2012/063455 JP2012063455W WO2012165321A1 WO 2012165321 A1 WO2012165321 A1 WO 2012165321A1 JP 2012063455 W JP2012063455 W JP 2012063455W WO 2012165321 A1 WO2012165321 A1 WO 2012165321A1
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- WIPO (PCT)
- Prior art keywords
- wiring
- ink
- substrate
- solder bump
- resin
- Prior art date
Links
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 31
- 239000000758 substrate Substances 0.000 claims abstract description 102
- 239000011347 resin Substances 0.000 claims abstract description 85
- 229920005989 resin Polymers 0.000 claims abstract description 85
- 229910000679 solder Inorganic materials 0.000 claims abstract description 71
- 238000002844 melting Methods 0.000 claims abstract description 21
- 230000008018 melting Effects 0.000 claims abstract description 21
- 238000000034 method Methods 0.000 claims abstract description 14
- 229920001187 thermosetting polymer Polymers 0.000 claims abstract description 13
- 230000005611 electricity Effects 0.000 claims abstract description 3
- 238000005304 joining Methods 0.000 claims description 5
- 238000003825 pressing Methods 0.000 claims description 3
- 238000007599 discharging Methods 0.000 claims description 2
- 230000000977 initiatory effect Effects 0.000 abstract 1
- 239000007788 liquid Substances 0.000 description 9
- 239000010410 layer Substances 0.000 description 7
- 230000000694 effects Effects 0.000 description 6
- 238000010438 heat treatment Methods 0.000 description 6
- 229910004298 SiO 2 Inorganic materials 0.000 description 5
- 239000000853 adhesive Substances 0.000 description 5
- 230000001070 adhesive effect Effects 0.000 description 5
- 230000007423 decrease Effects 0.000 description 4
- 230000002427 irreversible effect Effects 0.000 description 4
- 238000003860 storage Methods 0.000 description 4
- 239000004840 adhesive resin Substances 0.000 description 3
- 229920006223 adhesive resin Polymers 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 3
- 230000000149 penetrating effect Effects 0.000 description 3
- 229920001721 polyimide Polymers 0.000 description 3
- 239000000155 melt Substances 0.000 description 2
- 238000005192 partition Methods 0.000 description 2
- 239000009719 polyimide resin Substances 0.000 description 2
- 229910052710 silicon Inorganic materials 0.000 description 2
- 239000010703 silicon Substances 0.000 description 2
- 239000010409 thin film Substances 0.000 description 2
- 239000004925 Acrylic resin Substances 0.000 description 1
- 229920000178 Acrylic resin Polymers 0.000 description 1
- 239000004642 Polyimide Substances 0.000 description 1
- 229910020830 Sn-Bi Inorganic materials 0.000 description 1
- 229910018728 Sn—Bi Inorganic materials 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000004132 cross linking Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000000113 differential scanning calorimetry Methods 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 230000005496 eutectics Effects 0.000 description 1
- 239000010408 film Substances 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 230000013011 mating Effects 0.000 description 1
- 230000036961 partial effect Effects 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 239000011241 protective layer Substances 0.000 description 1
- 230000002829 reductive effect Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
- B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
- B41J2/01—Ink jet
- B41J2/135—Nozzles
- B41J2/16—Production of nozzles
- B41J2/162—Manufacturing of the nozzle plates
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
- B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
- B41J2/01—Ink jet
- B41J2/135—Nozzles
- B41J2/14—Structure thereof only for on-demand ink jet heads
- B41J2/14201—Structure of print heads with piezoelectric elements
- B41J2/14233—Structure of print heads with piezoelectric elements of film type, deformed by bending and disposed on a diaphragm
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
- B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
- B41J2/01—Ink jet
- B41J2/135—Nozzles
- B41J2/16—Production of nozzles
- B41J2/1607—Production of print heads with piezoelectric elements
- B41J2/161—Production of print heads with piezoelectric elements of film type, deformed by bending and disposed on a diaphragm
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
- B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
- B41J2/01—Ink jet
- B41J2/135—Nozzles
- B41J2/16—Production of nozzles
- B41J2/1621—Manufacturing processes
- B41J2/1623—Manufacturing processes bonding and adhesion
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R4/00—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation
- H01R4/02—Soldered or welded connections
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
- B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
- B41J2/01—Ink jet
- B41J2/135—Nozzles
- B41J2/14—Structure thereof only for on-demand ink jet heads
- B41J2/14201—Structure of print heads with piezoelectric elements
- B41J2002/14306—Flow passage between manifold and chamber
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
- B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
- B41J2/01—Ink jet
- B41J2/135—Nozzles
- B41J2/14—Structure thereof only for on-demand ink jet heads
- B41J2002/14491—Electrical connection
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J2202/00—Embodiments of or processes related to ink-jet or thermal heads
- B41J2202/01—Embodiments of or processes related to ink-jet heads
- B41J2202/18—Electrical connection established using vias
Definitions
- the present invention relates to an inkjet head and an inkjet head manufacturing method, and more particularly, to an inkjet head manufacturing method capable of realizing high-density nozzles and preventing ink ejection failure due to poor connection of wiring, between the inkjet head and members.
- the present invention relates to a method for manufacturing an energization structure and an inter-member energization structure.
- a common ink flow path is provided for each nozzle row, a pressure chamber for applying discharge pressure to the ink, wiring for supplying power to the diaphragm included in the pressure chamber, and a common flow path Individual flow paths for supplying ink to the pressure chambers are individually provided for the plurality of nozzles.
- the droplet discharge head described in Patent Document 1 is formed by first stacking and integrating a top plate member on a top surface of a piezoelectric element substrate via a resin bonding portion.
- the piezoelectric element substrate includes a nozzle, a pressure chamber, a diaphragm, and a piezoelectric element in order from the bottom surface.
- the top plate member is provided with an ink supply port for supplying liquid to the pressure chamber and wiring on the lower surface thereof, and a liquid pool chamber is provided on the upper surface side thereof.
- the liquid pool chamber and the ink supply port communicate with each other through a through hole that penetrates the top plate member.
- the piezoelectric element substrate and the top plate member are thermocompression-bonded via a thermosetting resin, whereby the wiring and the piezoelectric element are electrically connected by bumps.
- the resin bonding portion forms a hollow partition member, the ink supply port and the pressure chamber are communicated with each other by the partition member.
- the nozzles, the pressure chambers, the diaphragm, the piezoelectric elements, the wirings, and the liquid pool chambers are arranged in a hierarchical structure in the vertical direction, so that it is possible to increase the density of the nozzles. .
- the piezoelectric element substrate and the top plate member are prone to unevenness and warpage, and the thickness is likely to vary, the distance between the piezoelectric element substrate and the top plate member that is thermocompression bonded via a thermosetting resin. May be non-uniform. Furthermore, bumps tend to vary in formation height and physical properties.
- the droplet discharge head according to Patent Document 1 has a problem that ink discharge failure is likely to occur due to poor connection of wiring.
- the inventor diligently studied this problem, paying attention to the relationship between the curing start temperature of the resin bonded portion and the melting point of the solder bump, and when these satisfy a specific relationship, the electrical connection failure during thermocompression bonding The present invention was found out to be prevented.
- an object of the present invention is to provide an inkjet head manufacturing method, an inkjet head, an inter-member energization structure manufacturing method, and inter-member energization capable of realizing high density nozzles and preventing ink ejection failure due to poor connection of wiring. To provide a structure.
- a plurality of pressure chambers arranged corresponding to the plurality of nozzles for discharging ink, respectively, a plurality of pressure chambers for storing ink discharged from the nozzles, and arranged corresponding to the pressure chambers, respectively.
- a head substrate having a plurality of piezoelectric elements for applying pressure to be discharged from a plurality of driving electrodes provided in correspondence with the piezoelectric elements,
- a wiring board having wirings for supplying power to the piezoelectric elements via the drive electrodes, The wiring board is thermally connected to the head substrate through a resin bonding portion made of a thermosetting resin, thereby electrically connecting the drive electrode and the wiring through solder bumps.
- a method of manufacturing an inkjet head for joining the head substrate and the wiring substrate The relationship between the melting point T B [° C.] of the solder bump and the curing start temperature T R [° C.] of the resin bonded portion is (T R [° C.] ⁇ T B [° C.] ⁇ T R +30 [° C.]].
- An ink jet head manufacturing method characterized by satisfying:
- the electrical connection between the drive electrode and the wiring is an electrical connection by joining the solder bump and the stud bump, and one of the solder bump and the stud bump is provided on the drive electrode side, and the other Is provided on the wiring side.
- the head substrate has an ink introduction port for introducing ink into the pressure chamber, and the wiring substrate has an ink supply port for supplying ink to the ink introduction port.
- the method according to claim 1 or 2 wherein the ink introduction port and the ink supply port are communicated with each other through a through hole formed in the resin adhesion portion.
- the power supply unit and the power reception unit are formed by thermocompression bonding a first member provided with a power supply unit and a second member provided with a power reception unit via a resin bonding unit made of a thermosetting resin.
- the relationship between the melting point T B [° C.] of the solder bump and the curing start temperature T R [° C.] of the resin bonded portion is (T R [° C.] ⁇ T B [° C.] ⁇ T R +30 [° C.]].
- the manufacturing method of the electricity supply structure between members characterized by satisfy
- An ink jet head comprising the inter-member energization structure described in 7 above.
- an inkjet head manufacturing method an inkjet head, an inter-member energization structure manufacturing method, and an inter-member energization structure capable of realizing high density nozzles and preventing ink ejection failure due to poor connection of wiring. Can be provided.
- Sectional drawing which shows an example of the inkjet head which concerns on this invention Partial enlarged sectional view of FIG. The figure which shows an example of the rigidity change of the resin adhesion part and solder bump accompanying temperature rise
- FIG. 1 is a sectional view showing an example of a droplet discharge head according to the present invention
- FIG. 2 is a partially enlarged sectional view thereof.
- a head substrate 10 and a wiring substrate 20 each having a rectangular shape in plan view are laminated and integrated via a resin bonding portion 30 provided therebetween.
- a box-shaped manifold 40 is provided on the upper surface of the wiring board 20, and a liquid storage chamber 41 in which ink is stored is formed between the upper surface of the wiring board 20.
- An ink supply port 42 supplies ink into the liquid storage chamber 41.
- the head substrate 10 includes, from the lower side in the figure, a nozzle plate 11 formed of a Si (silicon) substrate, an intermediate plate 12 formed of a glass substrate, a pressure chamber plate 13 formed of a Si (silicon) substrate, and SiO 2. It has a diaphragm 14 formed of a thin film.
- the nozzle plate 11 includes a nozzle 111 that opens toward the lower surface.
- the pressure chamber plate 13 is formed with a pressure chamber 131 for containing ink for ejection penetrating vertically. Therefore, the upper wall of the pressure chamber 131 is constituted by the diaphragm 14 and the lower wall is constituted by the intermediate plate 12.
- the intermediate plate 12 is formed with a communication passage 121 that allows the inside of the pressure chamber 131 and the nozzle 111 to communicate with each other.
- a piezoelectric element 150 made of a thin film PZT is sandwiched between an upper electrode 151 and a lower electrode 152 which are driving electrodes for driving the piezoelectric element 150.
- the lower electrode 152 is in contact with the surface of the diaphragm 14, and the piezoelectric element 150 and the upper electrode 151 on the upper surface thereof are individually laminated on the lower electrode 152 so as to correspond to the pressure chamber 131 on a one-to-one basis. Has been.
- stud bump 153 is a stud bump, which is formed on the upper electrode 151 with gold or the like and protrudes toward the wiring board 20.
- the stud bump 153 one that does not melt at the temperature of heat treatment such as thermocompression bonding is usually used.
- an upper wiring 23 is formed on the upper surface of a substrate body 21 made of a Si substrate via an insulating layer 22 made of SiO 2 .
- An FPC (flexible printed circuit board) 51 on which a driving IC 50 is mounted is electrically connected to the upper wiring 23 at the end of the wiring board 20 by, for example, ACF (anisotropic conductive film).
- a wiring protection layer 24 made of SiO 2 is laminated on the upper surface of the upper wiring 23.
- a part of the upper wiring 23 faces the lower surface of the substrate body 21 through a through hole 211 formed in the substrate body 21, and a lower portion formed on the lower surface of the substrate body 21 via an insulating layer 25 made of SiO 2. It is electrically connected to the wiring 26.
- a part of the lower wiring 26 is exposed on the wiring protective layer 27 made of SiO 2 facing the actuator 15, and a plurality of, for example, Sn—Bi eutectic solder is formed on the exposed lower wiring 26.
- Solder bumps 261 are formed protruding toward the head substrate 10.
- the resin bonding portion 30 is sandwiched between the substrates 10 and 20 so that a predetermined distance is provided between the upper surface of the head substrate 10 and the lower surface of the wiring substrate 20.
- the resin bonding portion 30 has a through-hole 33 that penetrates the resin bonding portion 30 from the head substrate 10 side to the wiring substrate 20 side.
- the through hole 33 is formed by laminating and integrating the head substrate 10 and the wiring substrate 20, and at the same time, an ink supply port 201 provided on the lower surface of the wiring substrate 20 and an ink introduction port 101 provided on the upper surface of the head substrate 10. Are provided to communicate with each other.
- the upper end of the through hole 33 communicates with the through hole 28 penetrating up and down the wiring substrate 20 through the ink supply port 201 provided on the lower surface of the wiring substrate 20, and the lower end is communicated with the lower electrode 152 of the head substrate 10 and the vibration.
- the pressure chamber plate 13 communicates with a through hole 132 penetrating vertically.
- a communication path 122 that communicates with the inside of the through hole 132 and the pressure chamber 131 is recessed in the surface of the intermediate plate 12 (joining surface with the pressure chamber plate 13).
- 33, the through-hole 132, and the communication path 122 constitute an individual flow path 60 for supplying ink from the liquid storage chamber 41 included in the manifold 40 provided on the upper surface of the wiring substrate 20 to each pressure chamber 131. . That is, one individual flow path 60 passes through one through hole 33.
- the resin that forms the resin bonding portion 30 is not particularly limited, but a polyimide resin, an epoxy resin, an acrylic resin, and the like can be preferably exemplified. Particularly, since the polyimide resin is excellent in rigidity, it is between the head substrate 10 and the wiring substrate 20. This is suitable for making the interval uniform.
- the resin adhesion part 30 can be formed by exposure and development using, for example, a thermosetting photosensitive adhesive resin sheet.
- a thermosetting photosensitive adhesive resin sheet include Toray's photosensitive polyimide adhesive sheet and DuPont's PerMX series (trade name).
- the height of the resin bonding portion 30 is sufficiently larger than the thickness (height) of the actuator 15. For this reason, a sufficient space is formed between the actuator 15 and the wiring board 20 above the actuator 15. The mechanical deformation operation is not disturbed.
- a region where the resin bonding portion 30 does not exist forms a gap 300.
- a plurality of stud bumps 153 on the head substrate 10 side and a plurality of solder bumps 261 on the wiring substrate 20 side make a pair with each other in the gap 300. At the same time, it is in contact with other pairs independently.
- power can be supplied from the driving IC 50 to the piezoelectric elements 150 from the lower wiring 26 via the upper electrodes 151 of the actuators 15.
- the nozzle 111, the pressure chamber 131, the piezoelectric element 150, the lower wiring 26, and the manifold 40 included in the inkjet head 1 are arranged so as to have a hierarchical structure in the vertical direction. It is possible to make it easier.
- the wiring substrate 20 and the head substrate 10 are thermocompression bonded via a resin bonding portion 30 made of a thermosetting resin, whereby the head substrate 10 and the wiring substrate 20 are joined. Yes.
- solder bumps 261 melted and deformed by the thermocompression bonding are connected to the stud bumps 153, whereby the upper electrode 151 and the lower wiring 26 of the actuator 15 are electrically connected.
- Resin bonding portion 30 is heated by being heated during thermocompression bonding.
- the inventor has paid attention to the fact that the viscosity [Pa ⁇ s] of the resin bonding portion 30 exhibits a characteristic behavior in the process of increasing the temperature.
- the change pattern of the viscosity [Pa ⁇ s] of the resin bonded portion 30 is substantially equal to the change pattern of the rigidity of the resin bonded portion 30 with respect to the pressure during thermocompression bonding.
- the viscosity [Pa ⁇ s] of the resin bonding portion 30 gradually decreases in the first temperature rising process from the start of heating until reaching the curing start temperature T R [° C.]. That is, the rigidity of the resin bonding part 30 is gradually reduced.
- the adhesive resin portion 30 exhibits adhesiveness due to the decrease in rigidity (viscosity).
- the viscosity [Pa ⁇ s] shows the minimum value.
- the viscosity [Pa ⁇ s] gradually increases. That is, the rigidity of the resin bonding part 30 is gradually increased.
- the curing start temperature T R [° C.] of the resin bonded portion 30 is a temperature at which the viscosity of the resin bonded portion 30 has a minimum value when the temperature is raised as described above, and is measured by differential scanning calorimetry (DSC). can do.
- the melting point T B [° C.] of the solder bump 261 and the curing start temperature T R [° C.] of the resin bonding portion 30 are (T R [° C.] ⁇ T B [° C.] ⁇ T R +30 [
- the melting of the solder bump 261, that is, the reduction of the rigidity is started.
- the melting point is the melting start temperature when the temperature is increased by heating.
- FIG. 3 is a diagram showing an example of a change in rigidity accompanying the temperature rise of the resin bonding portion 30 and the solder bump 261.
- the curves indicated by 30 ′ and 261 ′ indicate the rigidity of the resin bonding portion 30 and the solder bump 261, respectively.
- the melting point T B [° C.] of the solder bump 261 and the curing start temperature T R [° C.] of the resin bonding portion 30 are (T R [° C.] ⁇ T B [° C.] ⁇ T R +30 [° C. ]),
- T R [° C.] ⁇ T B [° C.] ⁇ T R +30 [° C. ]) The state where both the rigidity 30 'and 261' of the resin bonding portion 30 and the solder bump 261 are lowered is avoided as shown in FIG.
- a state in which the amount of change in each of the rigidity 30 ′ and 261 ′ of the portion 30 and the solder bump 261 is opposite to each other is preferably formed.
- the resin bonded portion 30 gradually increases in rigidity 30 ′, but does not reach a temperature at which irreversible curing is completed (usually T R +50 [° C.] to T R +60 [° C.]).
- the solder bump 261 melts and the rigidity 261 ′ decreases during the adhesive period.
- unevenness, warpage, thickness variation, and variation in the formation height of the solder bumps 261 of the head substrate 10 and the wiring substrate 20 are absorbed by melting of the solder bumps 261, and all the solder bumps 261 and stud bumps 153 are covered.
- a reliable electrical connection state in which the tip end of the stud bump 153 bites into the solder bump 261 can be formed.
- the resin bonding portion 30 is not yet cured, but reaches a temperature at which curing is completed after the solder bumps 261 and the stud bumps 153 are electrically connected, and between the head substrate 10 and the wiring substrate 20. Can be securely bonded.
- solder bump 261 is excessively compressed between the head substrate 10 and the wiring substrate 20 and flows out to the surroundings, or a portion where the solder bump 261 cannot be contacted without reaching the mating member.
- the ink jet head of the present invention has an effect that it is possible to realize a high density of nozzles and to prevent ink discharge failure due to poor connection of wiring.
- the melting point T B [° C.] of the solder bump 261 is lower than the curing start temperature T R [° C.] of the resin bonding portion 30 (T R [° C.]> T B [° C.]. ]), whereby reducing the rigidity 261 ′ of the solder bump 261 in parallel with the reduction of the rigidity 30 ′ of the resin bonding portion 30 in the first temperature raising process described above.
- the solder bump 261 reaches the curing start temperature T R [° C.] of the resin bonding portion 30. Since it melts, there is a possibility that an undesired situation in which the solder flows out to the surroundings may occur due to the heat-compression bonding being continued for a long time until the resin bonding portion 30 is cured. As a result, ink ejection failure due to poor wiring connection is likely to occur.
- the solder bump 261 is melted between the start of the curing of the resin adhesive portion 30 and the completion of the curing.
- the duration of the thermocompression bonding is short, and there is no possibility that the solder will flow out.
- each of the resin bonding portion 30 and the solder bump 261 is Since the change amounts of the stiffnesses 30 ′ and 261 ′ tend to cancel each other, the apparent sum of the stiffnesses 30 ′ and 261 ′ (broken line S: apparent stiffness in the figure) is made constant.
- the apparent rigidity S reflects the rigidity 30 ′ and 261 ′ of the resin bonding portion 30 and the solder bump 261. Therefore, the apparent rigidity S corresponds to the rigidity between the head substrate 10 and the wiring substrate 20 with respect to the pressure during thermocompression bonding. It becomes almost equal.
- the temperature ranges from the melting point T B [° C.] of the solder bump 261 to the temperature at which the irreversible curing of the resin bonded portion 30 is completed (usually T R +50 [° C.] to T R +60 [° C.]).
- T R +50 [° C.] to T R +60 [° C.] the temperature at which the irreversible curing of the resin bonded portion 30 is completed.
- the change amounts of the rigidity 30 ′ and 261 ′ are synergized without being offset each other. Therefore, the apparent sum of the respective stiffnesses 30 ′ and 261 ′ (broken line S: apparent stiffness in the figure) is a temperature at which the irreversible curing of the resin bonding portion 30 is completed from the melting point T B [° C.] of the solder bump 261. Over the region up to this point, it shows a sharp drop and rise, making it difficult to form the stable region C as in the present invention. That is, curing of the resin bonding portion 30 proceeds in a state where the rigidity between the head substrate 10 and the wiring substrate 20 changes rapidly with respect to the pressure during thermocompression bonding.
- the through-hole 33 serving as the ink flow path, the through-hole 33 is formed. Since the hole 33 is connected to each of the ink introduction port 101 of the head substrate 10 and the ink supply port 201 of the wiring substrate 20 with high accuracy, an effect of improving ink ejection accuracy can be obtained.
- the wiring substrate 20 is thermocompression bonded to the head substrate 10 via the resin bonding portion 30 made of a thermosetting resin.
- the piezoelectric element 150 and the lower wiring 26 are electrically connected via the solder bumps 261, and the head substrate 10 and the wiring substrate 20 are bonded.
- the melting point T B [° C.] of the solder bump 261 and the curing start temperature T R [° C.] of the resin bonding portion 30 are (T R [° C.] ⁇ T B [° C.] ⁇ T
- R +30 [° C.] it is possible to achieve high density of the nozzles and to prevent ink discharge failure due to poor connection of wiring.
- the post-baking is performed without pressing for a predetermined time at a temperature equal to or higher than the melting point TB [° C.] of the solder bump 261. It is preferable to perform (heat treatment).
- the melting point T B [° C.] or higher temperature conditions of the bumps 261 solder
- the solder bump 261 when the solder bump 261 is connected to the stud bump 153 to form an electrical connection, even if the solder bump 261 is melted, the stud bump 153 supports this, so that the solder bump 261 flows out. It is preferably prevented. Furthermore, this makes it possible to perform post-baking at a higher temperature and for a longer time than in the past, so that the cross-linking reaction between the polymers constituting the resin adhesive portion 30 can be further advanced. Thereby, the chemical stability of the resin bonding part 30 can be improved. In particular, when the resin bonding portion 30 includes the through-hole 33, that is, forms an ink flow path, an effect of improving ink resistance is obtained. Thereby, the effect which can obtain the inkjet head excellent in ink tolerance is acquired.
- solder bump 261 is provided on the wiring substrate 20 (lower wiring 26) side and the stud bump 153 is provided on the head substrate 10 (upper electrode 151) side has been described.
- stud bumps may be provided on the wiring substrate side 20 (lower wiring 26) side, and solder bumps may be provided on the head substrate 10 (upper electrode 151) side.
- the head substrate 10 has the nozzle 111, the pressure chamber 131, and the piezoelectric element 150, and the wiring substrate 20 has the lower wiring 26 and is heated via the resin bonding portion 30.
- the present invention is not necessarily limited thereto.
- the head substrate 10 does not have the nozzle 111 at the time of heat pressure bonding, that is, the nozzle plate 11 is not yet stacked. Even applicable.
- the present invention is not limited to the ink jet head described above.
- the present invention can be preferably applied to the case where the two members are joined with a thermosetting resin and energized with bumps. That is, the power supply unit and the second member provided with the power receiving unit and the second member provided with the power receiving unit are thermocompression-bonded via a resin bonding unit made of a thermosetting resin, thereby thereby electrically connected via the solder bump and a power receiving unit, in the manufacturing method of the member between energizing structure for bonding the second member and the first member, the melting point T B of the solder bump [°C] And the curing start temperature T R [° C.] of the resin adhesive portion satisfies the relationship of (T R [° C.] ⁇ T B [° C.] ⁇ T R +30 [° C.]],
- the power receiving unit can be energized with high accuracy.
- the inter-member energization structure obtained by the method for producing the inter-member energization structure has an effect that the power feeding unit and the power receiving unit are energized with high accuracy.
- the first member, the power feeding unit, the second member, and the power receiving unit are not particularly limited, and in the case of the inkjet head 1 described above, for example, the first member is the wiring board 20,
- the power feeding portion can correspond to the lower wiring 26
- the second member can correspond to the head substrate 10
- the power receiving portion can correspond to the piezoelectric element 150.
- Inkjet head 10 Head substrate 101: Ink inlet 11: Nozzle plate 111: Nozzle 112: Liquid channel 12: Intermediate plate 121: Communication channel 122: Communication channel 13: Pressure chamber plate 131: Pressure chamber 132: Through hole 14: Diaphragm 15: Actuator 150: Actuator body 151: Upper electrode 152: Lower electrode 153: Stud bump 20: Wiring board 201: Ink supply port 21: Board body 211: Through hole 22: Insulating layer 23: Upper wiring 24: Wiring protection layer 25: Insulating layer 26: Lower wiring 261: Solder bump 27: Wiring protection layer 28: Through hole 30: Resin bonding portion 33: Through hole 300: Gap 40: Manifold 41: Liquid storage chamber 42: Ink supply port 50 : Driving IC 51: FPC 60: Individual flow path
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- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Particle Formation And Scattering Control In Inkjet Printers (AREA)
Abstract
Description
前記駆動電極を介して前記圧電素子にそれぞれ給電するための配線を有する配線基板とを備え、
前記配線基板が前記ヘッド基板に対して、熱硬化性樹脂からなる樹脂接着部を介して、加熱圧着されることによって、前記駆動電極と前記配線とをはんだバンプを介して電気的に接続すると共に、前記ヘッド基板と前記配線基板とを接合するインクジェットヘッドの製造方法であって、
前記はんだバンプの融点TB[℃]と、前記樹脂接着部の硬化開始温度TR[℃]とが、(TR[℃]≦TB[℃]≦TR+30[℃])の関係を満たすことを特徴とするインクジェットヘッドの製造方法。
前記はんだバンプの融点TB[℃]と、前記樹脂接着部の硬化開始温度TR[℃]とが、(TR[℃]≦TB[℃]≦TR+30[℃])の関係を満たすことを特徴とする部材間通電構造の製造方法。
10:ヘッド基板
101:インク導入口
11:ノズルプレート
111:ノズル
112:液体流路
12:中間プレート
121:連通路
122:連通路
13:圧力室プレート
131:圧力室
132:貫通孔
14:振動板
15:アクチュエータ
150:アクチュエータ本体
151:上部電極
152:下部電極
153:スタッドバンプ
20:配線基板
201:インク供給口
21:基板本体
211:貫通孔
22:絶縁層
23:上部配線
24:配線保護層
25:絶縁層
26:下部配線
261:はんだバンプ
27:配線保護層
28:貫通孔
30:樹脂接着部
33:貫通孔
300:間隙
40:マニホールド
41:液体貯留室
42:インク供給口
50:駆動IC
51:FPC
60:個別流路
Claims (8)
- インクを吐出させる複数のノズルにそれぞれ対応して配設され、該ノズルから吐出させるインクを収容する複数の圧力室と、前記圧力室にそれぞれ対応して配置され、該圧力室内のインクを前記ノズルから吐出させるための圧力を付与する複数の圧電素子と、前記圧電素子にそれぞれ対応して設けられた複数の駆動電極とを有するヘッド基板と、
前記駆動電極を介して前記圧電素子にそれぞれ給電するための配線を有する配線基板とを備え、
前記配線基板が前記ヘッド基板に対して、熱硬化性樹脂からなる樹脂接着部を介して、加熱圧着されることによって、前記駆動電極と前記配線とをはんだバンプを介して電気的に接続すると共に、前記ヘッド基板と前記配線基板とを接合するインクジェットヘッドの製造方法であって、
前記はんだバンプの融点TB[℃]と、前記樹脂接着部の硬化開始温度TR[℃]とが、(TR[℃]≦TB[℃]≦TR+30[℃])の関係を満たすことを特徴とするインクジェットヘッドの製造方法。 - 前記駆動電極と前記配線との電気的接続が、前記はんだバンプとスタッドバンプとの接合による電気的接続であり、前記はんだバンプと前記スタッドバンプのうちの一方が前記駆動電極側に設けられ、他方が前記配線側に設けられていることを特徴とする請求項1記載のインクジェットヘッドの製造方法。
- 前記ヘッド基板は前記圧力室にインクを導入するためのインク導入口を有し、且つ、前記配線基板は前記インク導入口にインクを供給するためのインク供給口を有しており、前記加熱圧着によって、前記インク導入口と前記インク供給口とを、前記樹脂接着部に形成された貫通孔を介して連通させることを特徴とする請求項1又は2記載のインクジェットヘッドの製造方法。
- 前記加熱圧着の後に、前記はんだバンプの前記融点TB[℃]以上の温度で所定時間ポストベイクを行うことを特徴とする請求項1~3の何れかに記載のインクジェットヘッドの製造方法。
- 請求項1~4の何れかに記載のインクジェットヘッドの製造方法によって得られることを特徴とするインクジェットヘッド。
- 給電部が設けられた第1の部材と、受電部が設けられた第2の部材とを、熱硬化性樹脂からなる樹脂接着部を介して加熱圧着することによって、前記給電部と前記受電部とをはんだバンプを介して電気的に接続すると共に、前記第1の部材と前記第2の部材とを接合する部材間通電構造の製造方法において、
前記はんだバンプの融点TB[℃]と、前記樹脂接着部の硬化開始温度TR[℃]とが、(TR[℃]≦TB[℃]≦TR+30[℃])の関係を満たすことを特徴とする部材間通電構造の製造方法。 - 請求項6記載の部材間通電構造の製造方法によって得られることを特徴とする部材間通電構造。
- 請求項7記載の部材間通電構造を備えることを特徴とするインクジェットヘッド。
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US14/122,416 US9039131B2 (en) | 2011-05-27 | 2012-05-25 | Method for producing inkjet head, inkjet head, method for producing inter-member electrification structure, and inter-member electrification structure |
JP2013518047A JP5928457B2 (ja) | 2011-05-27 | 2012-05-25 | インクジェットヘッドの製造方法 |
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JP2018047522A (ja) * | 2016-09-21 | 2018-03-29 | セイコーエプソン株式会社 | Memsデバイス、液体噴射ヘッド、及び、液体噴射装置 |
WO2020027286A1 (ja) * | 2018-08-03 | 2020-02-06 | Johnan株式会社 | 電子部品実装方法及び三次元成形回路部品 |
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JP6589301B2 (ja) * | 2015-03-10 | 2019-10-16 | セイコーエプソン株式会社 | 液体噴射ヘッド、及び液体噴射ヘッドの製造方法 |
JP6504348B2 (ja) * | 2015-03-16 | 2019-04-24 | セイコーエプソン株式会社 | ヘッド及び液体噴射装置 |
JP7056059B2 (ja) * | 2017-09-29 | 2022-04-19 | ブラザー工業株式会社 | 複合基板 |
JP6992382B2 (ja) * | 2017-09-29 | 2022-02-03 | ブラザー工業株式会社 | 複合基板 |
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