WO2004032321A1 - 表面実装型sawデバイスの製造方法 - Google Patents
表面実装型sawデバイスの製造方法 Download PDFInfo
- Publication number
- WO2004032321A1 WO2004032321A1 PCT/JP2003/012656 JP0312656W WO2004032321A1 WO 2004032321 A1 WO2004032321 A1 WO 2004032321A1 JP 0312656 W JP0312656 W JP 0312656W WO 2004032321 A1 WO2004032321 A1 WO 2004032321A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- saw
- resin
- resin sheet
- chip
- saw chip
- Prior art date
Links
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- 239000000758 substrate Substances 0.000 claims abstract description 98
- 238000003825 pressing Methods 0.000 claims abstract description 70
- 238000010438 heat treatment Methods 0.000 claims abstract description 31
- 238000002844 melting Methods 0.000 claims abstract description 15
- 230000008018 melting Effects 0.000 claims abstract description 15
- 238000011417 postcuring Methods 0.000 claims abstract description 11
- 239000011248 coating agent Substances 0.000 claims abstract 2
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- 230000001681 protective effect Effects 0.000 claims description 13
- 239000004020 conductor Substances 0.000 claims description 9
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- 229910052751 metal Inorganic materials 0.000 description 12
- 239000002184 metal Substances 0.000 description 12
- 238000010897 surface acoustic wave method Methods 0.000 description 11
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- 229920006362 Teflon® Polymers 0.000 description 4
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- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 2
- 239000000919 ceramic Substances 0.000 description 2
- 230000002950 deficient Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- IIPYXGDZVMZOAP-UHFFFAOYSA-N lithium nitrate Chemical compound [Li+].[O-][N+]([O-])=O IIPYXGDZVMZOAP-UHFFFAOYSA-N 0.000 description 2
- 239000010453 quartz Substances 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- WSMQKESQZFQMFW-UHFFFAOYSA-N 5-methyl-pyrazole-3-carboxylic acid Chemical compound CC1=CC(C(O)=O)=NN1 WSMQKESQZFQMFW-UHFFFAOYSA-N 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H9/00—Networks comprising electromechanical or electro-acoustic devices; Electromechanical resonators
- H03H9/02—Details
- H03H9/05—Holders; Supports
- H03H9/10—Mounting in enclosures
- H03H9/1064—Mounting in enclosures for surface acoustic wave [SAW] devices
- H03H9/1085—Mounting in enclosures for surface acoustic wave [SAW] devices the enclosure being defined by a non-uniform sealing mass covering the non-active sides of the BAW device
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H9/00—Networks comprising electromechanical or electro-acoustic devices; Electromechanical resonators
- H03H9/25—Constructional features of resonators using surface acoustic waves
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- H01L24/93—Batch processes
- H01L24/95—Batch processes at chip-level, i.e. with connecting carried out on a plurality of singulated devices, i.e. on diced chips
- H01L24/97—Batch processes at chip-level, i.e. with connecting carried out on a plurality of singulated devices, i.e. on diced chips the devices being connected to a common substrate, e.g. interposer, said common substrate being separable into individual assemblies after connecting
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H3/00—Apparatus or processes specially adapted for the manufacture of impedance networks, resonating circuits, resonators
- H03H3/007—Apparatus or processes specially adapted for the manufacture of impedance networks, resonating circuits, resonators for the manufacture of electromechanical resonators or networks
- H03H3/08—Apparatus or processes specially adapted for the manufacture of impedance networks, resonating circuits, resonators for the manufacture of electromechanical resonators or networks for the manufacture of resonators or networks using surface acoustic waves
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- H01L2224/04—Structure, shape, material or disposition of the bonding areas prior to the connecting process
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- H01L2224/15—Structure, shape, material or disposition of the bump connectors after the connecting process
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- H01L2224/161—Disposition
- H01L2224/16151—Disposition the bump connector connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive
- H01L2224/16221—Disposition the bump connector connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive the body and the item being stacked
- H01L2224/16225—Disposition the bump connector connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive the body and the item being stacked the item being non-metallic, e.g. insulating substrate with or without metallisation
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- H01L2224/10—Bump connectors; Manufacturing methods related thereto
- H01L2224/15—Structure, shape, material or disposition of the bump connectors after the connecting process
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- H01L2224/161—Disposition
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- H01L2224/16235—Disposition the bump connector connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive the body and the item being stacked the item being non-metallic, e.g. insulating substrate with or without metallisation the bump connector connecting to a via metallisation of the item
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- H01L2224/93—Batch processes
- H01L2224/95—Batch processes at chip-level, i.e. with connecting carried out on a plurality of singulated devices, i.e. on diced chips
- H01L2224/97—Batch processes at chip-level, i.e. with connecting carried out on a plurality of singulated devices, i.e. on diced chips the devices being connected to a common substrate, e.g. interposer, said common substrate being separable into individual assemblies after connecting
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- H01L2924/0001—Technical content checked by a classifier
- H01L2924/00014—Technical content checked by a classifier the subject-matter covered by the group, the symbol of which is combined with the symbol of this group, being disclosed without further technical details
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- H01L2924/097—Glass-ceramics, e.g. devitrified glass
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- H01L2924/151—Die mounting substrate
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- H01L2924/15172—Fan-out arrangement of the internal vias
- H01L2924/15174—Fan-out arrangement of the internal vias in different layers of the multilayer substrate
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
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- Y10T29/00—Metal working
- Y10T29/42—Piezoelectric device making
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y10T29/49117—Conductor or circuit manufacturing
- Y10T29/49124—On flat or curved insulated base, e.g., printed circuit, etc.
- Y10T29/4913—Assembling to base an electrical component, e.g., capacitor, etc.
- Y10T29/49144—Assembling to base an electrical component, e.g., capacitor, etc. by metal fusion
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
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- Y10T29/49117—Conductor or circuit manufacturing
- Y10T29/49124—On flat or curved insulated base, e.g., printed circuit, etc.
- Y10T29/4913—Assembling to base an electrical component, e.g., capacitor, etc.
- Y10T29/49146—Assembling to base an electrical component, e.g., capacitor, etc. with encapsulating, e.g., potting, etc.
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
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- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/49002—Electrical device making
- Y10T29/49117—Conductor or circuit manufacturing
- Y10T29/49169—Assembling electrical component directly to terminal or elongated conductor
Definitions
- the present invention addresses various problems that occur in the process of manufacturing a surface acoustic wave device having a structure in which a surface acoustic wave chip is mounted face down on a mounting board using bumps and then the surface acoustic wave chip is resin-sealed.
- the present invention relates to a method for manufacturing a surface-mount type surface acoustic wave device that can be solved. Background technique fe
- the surface acoustic wave device has a configuration in which patterns such as comb-like electrode fingers (IDT electrodes), reflectors, and connection pads are arranged on a piezoelectric substrate such as quartz or lithium tantalate. For example, a surface acoustic wave is excited by applying a high-frequency electric field to an IDT electrode, and a filter characteristic is obtained by converting the surface acoustic wave into a high-frequency electric field by a piezoelectric action.
- CSP Chip Size Package
- FIG. 10 is a cross-sectional view showing a manufacturing procedure of the SAW device disclosed in the patent application 200 1-1 769 995.
- the S AW chip 110 is mounted on one side in a flip chip manner, and then the S AW chip 100 is provided across the S AW chips 100, and then the S AW chip is heated to the softening temperature.
- the molten deformed film 120 is spread in the valley between the chips.
- the mounting substrate 100 has external electrodes 102 for surface mounting on the lower surface of each insulating substrate 101 constituting each individual region, and external electrodes 100 on the upper surface of each insulating substrate.
- a land 103 electrically connected to 2 is provided, and a through hole 104 for bleeding is provided at the boundary between the insulating substrates 101.
- the SAW chip 110 includes a connection pad 112 and an IDT electrode 113 on the lower surface of the piezoelectric substrate 111, and connects the connection pad 112 to the land 1 via the conductor bump 115. By connecting to 03, the three chips 110 are mounted on each insulating substrate 101.
- the deformable film 120 is brought into close contact with the outer surface of all the SAW chips 110 and the upper surface of the mounting board by the above-described procedure, and then cut and divided along the boundary line of each insulating substrate to thereby obtain the SAW device. Individual pieces can be obtained.
- a through hole 104 is arranged in a mounting board portion corresponding to a valley of each SAW chip 110, and when the deformed film 120 is softened, a negative pressure from the through hole 104 is generated.
- the deformable film 120 can be brought into close contact with the outer surface of the SAW chip and the upper surface of the mounting board.
- an airtight space S for Saw propagation can be formed between the IDT electrode 113 and the upper surface of the insulating substrate immediately below the IDT electrode 113.
- the air is suctioned not in the vicinity of the hermetic space S but in a position corresponding to the valley between the SAW chips.
- the deformable film 120 has sufficiently entered the gap between the SAW chip skirt portion and the insulating substrate shown in the above, it cannot be in close contact with the upper surface of the insulating substrate.
- the amount of the deformed film 120 entering the gap A is insufficient, when the dicing is performed along the boundary line between the insulating substrates 101 and divided into individual pieces, the insulating film rises from the upper surface of the insulating substrate.
- the deformable film 120 is cut off to form a hole communicating with the airtight space S. In this case, the dust and moisture resistance of the SAW device is significantly reduced.
- the deformed film located in the valley between the SAW chips should be pressed into the gap A using a special mold, but the mold for that purpose has a special shape
- costs will increase.
- the cost increase becomes remarkable.
- a through hole 104 for deaeration shown in FIG. 10 is provided at the center of each insulating substrate 101, so that the resin softened by heating is formed.
- the gap A can be sufficiently spread to the inside from the gap A.
- a sheet-like flaky resin is attached to the upper surface of a SAW chip that is flipped in a face-down state on an insulating substrate.
- Heat to the softening (melting) temperature with, and keep the high viscosity from the side of the SAW chip to the upper surface of the insulating substrate and adhere.
- the temperature is further raised to the curing temperature by subsequent heating to fix the resin shape.
- the viscosity of the softened resin is high so that the resin does not flow into the gap between the SAW chip and the upper surface of the insulating substrate when the resin is heated to the softening temperature.
- the present invention has been made in view of the above, and a SAW chip is face-down mounted on a wiring board of a mounting board via a conductive bump, and a sheet resin attached to an upper surface of the SAW chip is heated and softened.
- a SAW chip is face-down mounted on a wiring board of a mounting board via a conductive bump, and a sheet resin attached to an upper surface of the SAW chip is heated and softened.
- an airtight space is formed between the IDT electrode on the lower surface of the SAW chip and the upper surface of the mounting substrate.
- a negative pressure is sucked through a through hole formed in the mounting board to secure the resin filling amount in the gap, and the adhesion between the resin and the mounting board is ensured.
- An object of the present invention is to provide a method of manufacturing a surface mount SAW device which eliminates the need to strictly manage the profile of heating temperature and suction. Disclosure of the invention
- the invention according to claim 1 includes an insulating substrate, an external electrode for surface mounting disposed on the bottom of the insulating substrate, and a wiring disposed on the insulating substrate and electrically connected to the external electrode.
- a SAW chip comprising: a mounting substrate having a pattern; a piezoelectric substrate; an IDT electrode formed on one surface of the piezoelectric substrate; and a connection pad connected to the wiring pattern via a conductive bump.
- a method of manufacturing a surface-mounted SAW device comprising: the wiring pattern and the connection pad; And a flip-chip mounting step of flip-chip mounting the SAW chip on the mounting board by connecting the SAW chips via the conductor bumps, and mounting a resin sheet having a larger area than the upper surface of the SAW chip on the upper surface of the SAW chip.
- the SAW chip having the outer surface laminated is heated while being pressurized, whereby the resin is cured while suppressing the expansion of the gas in the hermetic space.
- a post-curing step of heating at a temperature for which the resin is completely cured, and wherein the thickness t of the resin sheet before the laminating step is L [(X + Gx) (Y + Gy)] ⁇ tr where: L (X + Gx) (Y + Gy) (H + T + A) -XYT -XYA- [X VyA + YVx A + (4 Vx V y A) / 3]
- the thickness of the resin sheet used is set to an appropriate value, so that the valley between SAW chips can be formed. Filled softening
- the resin can be reliably spread to the bottom of the SAW chip to form an airtight space, and the sealing resin can be prevented from being deformed due to expansion of the airtight space due to heating.
- the SAW device is divided into individual pieces by dicing, there is no possibility that a hole for communicating the airtight space with the outside air is formed in the resin portion.
- the laminating step includes: a pressing port heated to a predetermined temperature that rotates while being pressed against the upper surface of the resin sheet; and a guide member attached to the lower surface of the mounting board.
- the heat roller lamination process presses the mounting board and the SAW chip between the heat roller lamination process.
- the heating temperature of the pressing roller is set to the softening temperature of the resin sheet or (B) softening or melting by heating and pressurizing the upper surface of the resin sheet by the pressing roller; (c) softening or melting the resin sheet By applying pressure while heating with a pressing roller, the SAW chip is covered with resin while securing the above-mentioned airtight space.
- the laminating step comprises: a blade heated to a predetermined temperature that moves in one direction while being pressed against the upper surface of the resin sheet at a tip, and a guide attached to the lower surface of the mounting board. And a blade laminating step of pressing the mounting substrate and the SAW chip between the blade member and the blade member.
- the following conditions are used: (a) The heating temperature of the blade is set to the softening temperature or melting temperature of the resin sheet. (B) softening or melting by applying pressure while heating the upper surface of the resin sheet by the blade; and (c) softening. Covering the SAW chip with resin while securing the hermetic space by heating and pressurizing the liquefied or molten resin sheet with a blade.
- the resin sheet By pressing the upper surface of the resin sheet using a heated blade instead of the pressing roller, the resin sheet is softened or melted, and the Saw chip is covered with the resin.
- the resin sheet in addition to the heat roller, the resin sheet may be crushed while being pressed by a heated blade, and the same effect as in the case of the heat roller can be obtained.
- the laminating step and the press forming step are sequentially performed with the lower surface attached to the upper surface of the SAW chip, and then the protective film is peeled off. Since the resin sheet body has enough tackiness to temporarily adhere when it is attached to the SAW chip, a protective film with good release properties is applied to the upper surface of the resin sheet where the pressing member etc. abut. By sticking the resin sheet, it is possible to prevent the resin sheet from adhering to the pressing roller, the blade and the pressing member during the laminating step and the pressing step.
- the invention of claim 5 is characterized in that, in any of claims 1 to 4, the protective film is made of polyethylene terephthalate (PET).
- PET polyethylene terephthalate
- the invention according to claim 6 is characterized in that, in claims 1 to 5, the laminating step is performed in a reduced-pressure atmosphere.
- the invention according to claim 7 is the method according to claims 1 to 5, wherein the laminating step is performed. Is carried out in an inert gas atmosphere.
- the inside of the hermetic space after the resin sealing is completed is filled with the inert gas, and the characteristics of the Saw device with respect to aging can be improved.
- the invention according to claim 8 is the method according to any one of claims 1 to 7, wherein the mounting substrate is a mounting substrate base material obtained by connecting a plurality of mounting substrate pieces in a sheet shape. It is characterized in that a large-area resin sheet is attached to the upper surface of a plurality of SAW chips mounted on a material, and then laminated.
- the manufacturing method described in each of the above claims can improve mass productivity by performing a batch process using a mounting substrate base material.
- the invention according to claim 9 is the method according to claim 8, wherein a large-area resin sheet is laminated on the plurality of SAW chips mounted on the mounting substrate base material, and then the pressing is performed using pressure plates from both upper and lower surfaces.
- a spacer for limiting the pressing force by the pressing plate is used so that excessive pressure is not applied to the resin-laminated SAW chip pieces.
- the resin sheet can be appropriately placed in the SAW chip valley by using a spacer to prevent excessive pressing without relying on fine adjustment of the pressing force by the pressing roller or blade that constitutes the laminating device. Can be filled and unfolded.
- a frame is arranged on a resin sheet mounted on a SAW chip group mounted on the mounting substrate base material, It is characterized in that the entire mounting substrate base material is press-formed together with the frame, and the resin located at the lower part of the frame is crushed and press-formed.
- the invention of claim 11 is characterized in that, in claim 10, the frame is integrated with a pressure member for press-molding the frame.
- the frame may be separate from the pressure member (metal plate, press machine), but it is easier to handle and improve workability if it is integrated.
- the invention of claim 12 is the invention according to claim 8 or 9, wherein in the press forming step, the frame is formed on the mounting substrate base material so as to surround the SAW chip group at a position separated from the outer diameter side thereof. A body is arranged, a resin sheet attached to the upper surface of the SAW chip group is press-molded, and expansion of the resin sheet to the side is suppressed by an inner peripheral surface of the frame body. Or the method of manufacturing a surface-mounted SAW device according to 9.
- the frame is a means for preventing the resin sheet from escaping to the side when the resin sheet is pressed, it may be arranged on the upper surface of the mounting substrate base material.
- FIG. 1A and 1B are an external perspective view and a longitudinal sectional view of a surface mount type surface acoustic wave device to be manufactured by a manufacturing method according to an embodiment of the present invention.
- FIG. 2 is an enlarged sectional view showing an example of the resin sheet.
- FIGS. 3 (a) and 3 (b) are a plan view and a front vertical sectional view showing a step of flip-chip mounting a SAW chip on each individual region on a mounting substrate base material.
- FIG. 4 is a diagram showing a state in which the lower surface of the resin sheet from which the base film has been peeled is placed so as to straddle the upper surface of a plurality of SAW chips mounted on the mounting substrate base material.
- FIGS. 5 (a) and 5 (b) are cross-sectional views illustrating a hot mouth lamination process in which a resin sheet temporarily bonded on each SAW chip is laminated on the SAW chip by a laminating apparatus. is there.
- FIG. 6 is a diagram illustrating a laminating step using a blade.
- FIGS. 7A and 7B are views for explaining a press forming step performed after the laminating step.
- FIGS. 8A and 8B are explanatory views of the post-curing step.
- FIGS. 9A and 9B are explanatory diagrams of the SAW chip as a finished product.
- FIG. 9A shows a defective product
- FIG. 9B shows a non-defective product.
- FIG. 10 is an explanatory diagram of a conventional example. BEST MODE FOR CARRYING OUT THE INVENTION
- FIGS. 1 (a) and 1 (b) are an external perspective view of a surface mount type surface acoustic wave device (hereinafter, referred to as a SAW device) manufactured by a manufacturing method according to an embodiment of the present invention, and a longitudinal section thereof.
- a SAW device surface mount type surface acoustic wave device manufactured by a manufacturing method according to an embodiment of the present invention
- the SAW device 1 is provided on an insulating substrate 3 made of glass, resin, ceramic, glass epoxy, alumina, or the like, an external electrode 4 for surface mounting provided on the bottom of the insulating substrate 3, and an upper surface of the insulating substrate 3.
- a mounting board 2 composed of a wiring pattern 5 electrically connected to the external electrode 4 via the internal conductor 6, and a connection pad 16 electrically and mechanically connected to the wiring pattern 5 via the conductor bump 10 and the connection
- a SAW chip 15 having IDT electrodes 17 electrically connected to the pads 16 on the lower surface of the piezoelectric substrate 18;
- a sealing resin 31 A that forms an airtight space S between the IDT electrode 17 and the upper surface of the mounting board by covering the outer surface (upper surface and side surface) of the W chip 15 except for the lower surface.
- the piezoelectric substrate 18 is made of, for example, quartz, lithium nitrate, or the like.
- the conductor bump 10 is made of Au in this example, but may be made of a conductive adhesive
- the IDT electrode 17 of the SAW chip 15 excites a surface acoustic wave by applying a high-frequency electric field from the lead terminal on the power supply side, and converts the surface acoustic wave into a high-frequency electric field by piezoelectric action.
- a filter characteristic can be obtained.
- the sealing resin 31A is heated and heated to the softening temperature once, deformed under pressure, and brought into close contact with the outer surface of the SAW chip and the upper surface of the mounting board. It is formed by fixing, and reinforces the airtightness of the SAW chip and the fixing force of the SAW chip to the mounting board. Further, the sealing resin 31 A is used to seal the space between the IDT electrode 17 and the upper surface of the insulating substrate 3 as an airtight internal space (airtight space S) in order to ensure SAW propagation. It also functions as a means.
- FIG. 2 is an enlarged cross-sectional view showing an example of the resin sheet 30.
- the resin sheet 30 is formed by peeling a protective film 32 having releasability from one surface of the resin sheet body 31.
- the base film 33 is removably attached to the other surface.
- the resin sheet body 31 is a sheet of liquid epoxy resin, and loses its fluidity by being frozen without crystallization while maintaining the liquid structure. In a laminating step described later, the resin sheet 30 has thermoplasticity to soften it.
- the thickness tr of the resin sheet body 31 is limited to a value greater than or equal to a value described later.
- the A releasable protection film 32 is attached on the upper surface to facilitate release in the printing process and the press forming process.
- PET polyethylene terephthalate
- the base film 33 As the base film 33, a polyester having a thickness of 50 m was used.
- the outline of the production method of the present invention is as follows. That is, by connecting the wiring pattern 5 on the mounting board 2 and the connection pad 16 on the lower surface of the SAW chip via the conductor bump 10, the flip-chip mounting of the SAW chip 15 on the mounting board 2 is performed.
- a resin sheet 30 having a larger area than the SAW chip is placed on the upper surface of the SAW chip 15 and the resin sheet 30 is softened from one end of the mounting board to the other end (or The laminating process of covering the outer surface of the S AW chip with resin 31 A while securing the airtight space S by pressing the resin sheet while melting the resin sheet, and the S AW chip 15 with the outer surface laminated with resin 31 A
- the SAW device 1 that has undergone the press molding process to cure the resin 31 A while suppressing the expansion of the gas in the hermetic space S, and the resin 31 A Complete curing temperature And a thermosetting step you heated Te consists.
- FIGS. 3A and 3B are a plan view and a front vertical cross-sectional view showing a step of flip-chip mounting the SAW chip 15 on each individual region 2 on the mounting substrate base material 40.
- the mounting substrate 2 belonging to each individual region has the external electrode 4 at the bottom of the insulating substrate 3 and the wiring pattern 5 at the top, and conducts the external electrode 4 and the wiring pattern 5 inside.
- the inner conductor 6 is provided. By connecting the connection pad 16 of the SAW chip to the wiring pattern 5 using the conductor bump 10, the flip chip mounting is performed.
- FIG. 4 shows a resin sheet 30 from which the base film 33 has been peeled off so as to straddle the upper surfaces of a plurality of SAW chips 15 (piezoelectric substrates 18) mounted on the mounting substrate 40 of FIG.
- the resin sheet body 31 has Therefore, if the lower surface from which the base film 33 has been peeled off is placed on the upper surface of the SAW chip, the resin sheet 30 is temporarily bonded to the upper surface of the SAW chip 15 and there is no possibility that the resin sheet will shift during handling or the like.
- FIG. 5 is a cross-sectional view illustrating a heat roller laminating step of laminating the resin sheet 30 temporarily bonded on each SAW chip 15 to the SAW chip by the laminating device 50.
- the laminating device 50 for performing the heat roller laminating process is a movement (not shown) for moving the mounting substrate base material 40 on which the SAW chip 15 is mounted at a predetermined laminating speed in a direction indicated by an arrow.
- a pressing roller 51 as a heat roller which is pressed against the upper surface of the resin sheet 30 on the SAW chip 15 and is driven to rotate in the direction of the arrow, and a lower surface of the mounting substrate 40.
- a support roller 52 as a guide member for generating a pressing force with the pressing roller 51.
- the pressing roller 51 is heated and controlled to a required temperature by a heater (not shown), and is rotationally driven by a drive source (not shown) so as to feed the mounting substrate base material in the laminating direction.
- the support roller 52 is rotated or driven in the direction of the arrow.
- a flat stage-shaped guide member is provided instead of the support roller 52 to guide the lower surface of the mounting substrate base material. You may do so.
- the heating temperature of the pressing roller 51 is set to be equal to or higher than the softening (or melting) temperature of the resin sheet 30 and lower than the curing temperature.
- the resin sheet 30 temporarily bonded over a plurality of SAW chips 15 is subjected to a laminating process using the pressing roller 51 shown in FIG. Laminating is performed by filling from above to the upper surface of the mounting substrate base material.
- the surface temperature of the pressing roller 51 controlled by a heater is maintained at a temperature equal to or higher than the softening temperature of the resin sheet body 31 and lower than the curing temperature.
- the resin sheet main body 31 in the present embodiment has a temperature at which the resin sheet softens to a releasable elastic modulus of 60 ° C. or higher and a curing temperature of 150 ° C. By keeping the surface temperature of 51 to 80 to 10 ° C, lamination in the optimal softened state becomes possible.
- the lower support roller 52 (or stage) is not particularly heated, but may be heated if necessary.
- the gap between the rollers 51 and 52 is set to be approximately the same as the sum of the thickness of the mounting board base material 40 and the height of the SAW device 15, but the thickness of the releasable protection film 32 It is necessary to appropriately adjust according to the elastic modulus of the resin sheet main body 31 and the like.
- the pressing roller 51 is driven to rotate in the direction of the arrow by manual operation or by a motor drive, etc., and as shown in FIG. 5 (a), a mounting board in which a resin sheet 30 is temporarily bonded on each SAW chip 15
- the softened resin sheet main body 31 enters the valley of the SAW chip 15 as shown in FIG. And surrounds the SAW chip 15 while securing an airtight space S between the SAW chip 15 and the surface of the mounting substrate base material.
- the heat roller lamination was performed at a lamination speed of 0.1 to 0.3 m / min.
- the heat roller laminating method is employed because the airtight space S between the SAW chip 15 and the mounting board base material 40 is not extended more than necessary from one end of the resin sheet. This is because there is a purpose of laminating while bleeding air by sequentially pressing toward the other end side. Therefore, any method other than the pressing roller can be used as a means for heating and pressing the resin sheet as long as the method can perform lamination while removing air sequentially. Specifically, as shown in FIG. 6, for example, using a blade 55 heated to a required temperature, the edge of the blade 55 is moved in the direction of the arrow while being pressed against the protective film 32 of the resin sheet 30. It is also effective to apply pressure simultaneously with heating. In this case, the stage 53 is used as a guide member.
- the laminating step is performed in a reduced-pressure atmosphere such as a vacuum oven, air can be more efficiently removed, the adhesion of the resin can be increased, and an appropriate airtight space S can be formed.
- FIGS. 7A and 7B are views for explaining a press forming step performed after the laminating step.
- the press forming step is performed by a press forming apparatus 60.
- the press forming apparatus 60 includes a metal mold 61 that supports the bottom surface of the mounting board base material 40, and a spacer that is positioned in the outer diameter direction of the mounting board base material 40 that is supported on the metal mold 61. 6 2, a frame 63 attached along the outer edge of the upper surface of the resin sheet 30 laminated on the mounting substrate 40, and a metal plate (pressing) for pressing the upper surface of the frame 63. Member) 64 and a press 70.
- the resin-laminated mounting board base material after the lamination process (Fig. 5 (b) ⁇ , hereinafter referred to as laminated unit U) is placed on the top surface of the metal mold 61 as shown in Fig. 7 (a).
- the laminated unit U is spaced apart in the outer diameter direction of the laminated unit U so as to prevent excessive pressure from being applied to the laminated unit U, and a tefrance sensor 62 is provided.
- the tefance sensor 62 is fixed to the upper surface of the metal mold 61.
- an annular tef frame 63 that is larger than the area where the SAW chip 15 is mounted is placed, and a metal plate is placed thereon. 6 Place 4.
- press molding as shown in FIG. 7 (b) is performed using a press machine 70.
- the press 70 comprises an upper mold (pressing member) 71 and a lower mold 72.
- the upper mold 71 and the lower mold 72 are each set to a resin curing temperature of 150 ° C. Have been.
- the metal mold 61 is placed on the lower mold 72 and the upper mold 71 is brought into contact with the upper surface of the metal plate 64 to perform pressing.
- the resin is cured while the expansion of the air in the hermetic space s is forcibly suppressed by the press, so that unnecessary expansion of the hermetic space due to the expansion of the air does not occur.
- the Teflon frame 63 is used as a frame for pressing the outer peripheral edge of the upper surface of the resin sheet.
- a frame made of a material other than Teflon may be used. Good.
- the frame 63 may be integrated with a metal plate (pressing member) 64 or may be directly pressed by a press upper die (pressing member) 71 without using the metal plate 64.
- a structure in which the frame 63 is integrated with the lower surface of the press machine upper die 71 may be used.
- the frame 63 is a means for suppressing the expansion of the resin sheet 30 in the side direction, it is necessary to dispose the frame 63 on the upper surface of the resin sheet 30 if the purpose is achieved.
- the annular frame 63 may be integrated in advance on the mounting board base material 40 corresponding to the outer diameter side of the SAW chip group.
- the mounting board base material is made of ceramic (alumina). In such a case, if a frame made of the same material is integrally manufactured in advance when manufacturing the mounting substrate base material, problems such as misalignment can be prevented.
- a post-curing step is started.
- Laminated unit U is placed in a thermostat (post-curing unit) with the ambient temperature set to 150 ° C as shown in Fig. 8 (a), and heated for 3 hours.
- This is a temperature and time sufficient for the resin sheet body 31 of the resin sheet 30 employed this time to be completely cured, and it is necessary to appropriately select curing conditions depending on conditions such as the material of the resin sheet to be used. is there.
- the release protective film 32 may be peeled off before or after the post-curing step, and may be performed after the press forming step. In this embodiment, the PET as the release protective film 32 was peeled off after the post-curing step. '
- dicing is performed while applying cutting water, chemicals, or the like, so that there is a possibility that the resin as the sealing material may absorb water. If there is a risk that the moisture absorption by the resin will degrade the moisture resistance and aging characteristics of the SAW device, or if there is a risk that the sealing resin may be destroyed due to the steam explosion phenomenon (popcorn phenomenon), a baking step is provided after dicing. It is only necessary that water be released from the resin.
- the resin sealing method of the present invention comprising the three steps of the laminating step, the press forming step, and the post-curing step has been described above.
- the resin sheet 30 (particularly, the resin sheet body)
- the thickness of 3 1) is an extremely important requirement. In other words, when the thickness of the resin sheet body 31 is insufficient, as shown in FIG. 9 (a), the resin filled in the valley between the SAW chips flows from the bottom of the 38 Since the hermetic space S is greatly expanded to the outside, the hermetic space S reaches the dicing allowance. If divided into W devices, holes will be formed on the side of the resin, which will significantly reduce the dust and moisture proof performance of the SAW device.
- the minimum required resin sheet body The thickness of 31 can be calculated. That is, assuming that the thickness of the resin sheet main body 31 is tr, tr must satisfy the following conditions.
- the thickness tr of the resin sheet body As the upper limit value of the thickness tr of the resin sheet body, a value may be selected so that the resin does not enter the airtight space so that the resin does not adhere to the SAW propagation region.
- the resin sheet main body 31 adopted by the present inventor is softened because of thermoplasticity, but does not melt, so there was no concern about infiltration of the resin into the airtight space. Conversely, a problem may occur in which the resin does not enter the necessary portions. Therefore, it is necessary to appropriately select the thickness tr of the resin sheet body using the above equation. However, even if the resin is melted by heating, it can be applied to the present invention if the viscosity of the resin after melting is higher than a predetermined value.
- the resin sealing method according to the present invention also involves a pressurization in both the laminating step and the press forming step, so that the mounting method which is a disadvantage of the method disclosed in WO97Z0256 Poor adhesion between the substrate and the high-viscosity resin can be eliminated.
- the outer surface of the SAW chip mounted face down on the mounting board is covered with the heat-softened sheet resin, and the resin is filled in the gap between the bottom of the SAW chip and the upper surface of the mounting board.
- the mounting board is used to secure the resin filling amount in the gap. This eliminates the need for negative pressure suction through the through-hole formed in the substrate and the need to strictly manage the heating temperature and suction profile in order to secure the adhesion between the resin and the mounting board.
- the thickness of the resin sheet used is set to an appropriate value, so that the softened resin is (2) It is possible to reliably form an air-tight space by extending to the chip hem, and to prevent deformation of the sealing resin due to thermal expansion of the air-tight space. In particular, when dividing into individual SAW devices by dicing, there is no possibility that a hole for communicating the airtight space with the outside air is formed in the resin portion. According to the invention of claim 2, it is possible to reliably fill the softening resin between the valleys between the SAW chips to form an airtight space having an ideal shape and volume. According to the invention of claim 3, in the laminating step, the resin sheet may be crushed while being pressed by a heated blade, instead of using the hot roller, and the same effect as in the case of the hot roller can be obtained. it can.
- the resin sheet main body has such adhesiveness as to temporarily adhere when it is attached on the SAW chip, the resin sheet body for contacting the pressing member or the like is provided.
- a protective film with good releasability on the upper surface it is possible to prevent the resin sheet from adhering to the pressing roller, blade, and pressing member during the laminating step and the pressing step.
- the protective film is polyethylene terephthalate
- the laminating step is performed in an inert gas atmosphere, the airtight space after the completion of the resin sealing is filled with the inert gas, thereby preventing the SAW device from changing over time. Electrical characteristics can be maintained over time.
- mass production can be improved by performing the batch processing using the mounting substrate base material.
- the excessive pressurization using the spacer is performed without depending on the fine adjustment of the pressing force by the pressing roller blade constituting the laminating apparatus.
- the resin sheet can be properly filled and developed in the SAW chip valley.
- a large-area resin sheet is provided on a group of SAW chips densely arranged on a mounting substrate base material, and the outer periphery of the upper surface of the resin sheet is interposed via a frame.
- the resin located at the lower part of the frame is crushed, and the penetration of the resin into the skirt of the SAW chip located on the outer periphery of the SAW chip group can be promoted.
- the azure body is integrated with a pressing member for press-forming the frame.
- the frame may be separate from the pressure member (metal plate, press die), but if it is integrated, the handling will be more convenient and workability will be improved.
- a frame is integrated on the mounting substrate base material. Since the frame is a means for preventing the resin sheet from escaping to the side when the resin sheet is pressed, it may be arranged on the upper surface of the mounting substrate base material.
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- Engineering & Computer Science (AREA)
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- Computer Hardware Design (AREA)
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- Surface Acoustic Wave Elements And Circuit Networks Thereof (AREA)
- Encapsulation Of And Coatings For Semiconductor Or Solid State Devices (AREA)
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP03753993A EP1548937A4 (en) | 2002-10-04 | 2003-10-02 | METHOD OF MANUFACTURING SURFACE MOUNTED SAW COMPONENT |
US10/529,525 US7183124B2 (en) | 2002-10-04 | 2003-10-02 | Surface mount saw device manufacturing method |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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JP2002-293110 | 2002-10-04 | ||
JP2002293110A JP3702961B2 (ja) | 2002-10-04 | 2002-10-04 | 表面実装型sawデバイスの製造方法 |
Publications (1)
Publication Number | Publication Date |
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WO2004032321A1 true WO2004032321A1 (ja) | 2004-04-15 |
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ID=32063999
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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PCT/JP2003/012656 WO2004032321A1 (ja) | 2002-10-04 | 2003-10-02 | 表面実装型sawデバイスの製造方法 |
Country Status (6)
Country | Link |
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US (1) | US7183124B2 (ja) |
EP (1) | EP1548937A4 (ja) |
JP (1) | JP3702961B2 (ja) |
KR (1) | KR20050072421A (ja) |
CN (1) | CN100472962C (ja) |
WO (1) | WO2004032321A1 (ja) |
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US8264079B2 (en) * | 2007-06-28 | 2012-09-11 | Panasonic Corporation | Semiconductor device mounted structure and its manufacturing method, semiconductor device mounting method, and pressing tool |
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Also Published As
Publication number | Publication date |
---|---|
CN1692552A (zh) | 2005-11-02 |
US7183124B2 (en) | 2007-02-27 |
US20060053607A1 (en) | 2006-03-16 |
EP1548937A1 (en) | 2005-06-29 |
JP2004129092A (ja) | 2004-04-22 |
EP1548937A4 (en) | 2006-06-07 |
JP3702961B2 (ja) | 2005-10-05 |
KR20050072421A (ko) | 2005-07-11 |
CN100472962C (zh) | 2009-03-25 |
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