WO2009104438A1 - 弾性波装置及びその製造方法 - Google Patents
弾性波装置及びその製造方法 Download PDFInfo
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- WO2009104438A1 WO2009104438A1 PCT/JP2009/050666 JP2009050666W WO2009104438A1 WO 2009104438 A1 WO2009104438 A1 WO 2009104438A1 JP 2009050666 W JP2009050666 W JP 2009050666W WO 2009104438 A1 WO2009104438 A1 WO 2009104438A1
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- H03H3/00—Apparatus or processes specially adapted for the manufacture of impedance networks, resonating circuits, resonators
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- H—ELECTRICITY
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- H03H9/00—Networks comprising electromechanical or electro-acoustic devices; Electromechanical resonators
- H03H9/02—Details
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- H03H9/0504—Holders; Supports for bulk acoustic wave devices
- H03H9/0514—Holders; Supports for bulk acoustic wave devices consisting of mounting pads or bumps
- H03H9/0523—Holders; Supports for bulk acoustic wave devices consisting of mounting pads or bumps for flip-chip mounting
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- H03H9/058—Holders; Supports for surface acoustic wave devices
- H03H9/059—Holders; Supports for surface acoustic wave devices consisting of mounting pads or bumps
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Definitions
- the present invention relates to an elastic wave device and a manufacturing method thereof, and more particularly, to an elastic wave device in which a vibrating part such as a resonator or a filter is formed on a substrate and a manufacturing method thereof.
- FIG. 9 shows a configuration example of the elastic wave device.
- 9A is a cross-sectional view
- FIG. 9B is a cross-sectional view taken along line XX in FIG. 9A
- FIG. 9C is a cross-sectional view taken along line X-- in FIG. 9A
- FIG. 6 is a cross-sectional view of the lower side along X.
- the surface acoustic wave device 110 includes a vibration in which the IDT electrode 112 is formed on one main surface 111 a of the piezoelectric substrate 111 on which the conductive pattern including the IDT electrode 112, the pad 113, and the wiring line 118 is formed.
- a frame-like support layer 116 is formed of resin so as to surround the portion, and an insulating sheet cover layer 115 is formed on the support layer 116.
- An external electrode 117 is provided on the cover layer 115, and the external electrode 117 and the pad 113 are electrically connected by a via conductor 114 that penetrates the cover layer 115 and the support layer 116 (for example, Patent Document 1). reference).
- the acoustic wave device having such a configuration improves the solder wettability by providing a flux to the solder bump when mounting the solder bump on the external electrode on another circuit board.
- the flux may pass through the cover layer and flow into the hollow space.
- the present invention is intended to provide an elastic wave device capable of preventing flux from flowing into the interior of a hollow space when mounting using solder bumps.
- the present invention provides an elastic wave device configured as follows.
- the acoustic wave device includes: (a) a substrate; (b) a vibration portion formed on one main surface of the substrate; and (c) a vibration portion formed on one main surface of the substrate and electrically connected to an electrode of the vibration portion.
- a connected pad (d) a support layer provided on the one main surface of the substrate so as to surround the vibration part; and having a thickness larger than the thickness of the vibration part; and (e) the vibration.
- the flux When mounting an acoustic wave device, flux is applied to the solder bumps to improve solder wettability. However, the flux may flow into the hollow space.
- the inventor of the present application has found that the flux penetrates the cover layer because the cover layer is made of a resin containing synthetic rubber. Synthetic rubber needs to be added in order to make the cover layer into a sheet and is sticky and difficult to crack.
- the substrate is a piezoelectric substrate.
- the vibrating part includes an IDT electrode.
- the acoustic wave device is a surface wave device.
- the substrate is an insulating substrate.
- the vibrating portion includes a piezoelectric thin film having electrodes formed on both sides.
- the acoustic wave device is a bulk acoustic wave device such as a bulk acoustic wave resonator (Bulk Acoustic Wave Resonator; BAW resonator).
- the protective layer is made of the same material as the support layer.
- the protective layer and the support layer are made of the same material, the types of materials can be reduced, and the manufacturing process can be simplified.
- the protective layer is made of a photosensitive polyimide resin.
- the difference in the brightness profile between the solder bump and the protective layer becomes large, it becomes possible to recognize the solder bump, and the elastic wave device should be mounted with higher accuracy than when the external shape of the elastic wave device is recognized. Can do.
- the cover layer is made of a non-photosensitive epoxy resin.
- a nitride film or an oxide film interposed at least partly between the substrate and the support layer is further provided.
- the adhesion is improved by the anchor effect. Therefore, in the process process after hollow space formation, the malfunction that a plating solution penetrate
- the present invention also provides a method of manufacturing an acoustic wave device configured as follows.
- the method for manufacturing an acoustic wave device includes: (1) a first step of forming a vibration part and a pad electrically connected to the vibration electrode on one main surface of the substrate; and (2) the vibration part. Forming a support layer having a thickness larger than the thickness of the vibration on the one main surface of the substrate so as to surround the periphery of the substrate, and (3) the support so as to cover the vibration part.
- flux is applied to the solder bumps to improve solder wettability. Since the flux passes through the cover layer made of a resin containing synthetic rubber, the flux may flow into the hollow space only with the cover layer. On the other hand, when a protective layer made of a resin having flux resistance is provided on the cover layer as in the present invention, the flux does not pass through the protective layer made of a resin having flux resistance, so that the flux flows into the hollow space. You can avoid it.
- a plurality of acoustic wave devices having thin substrates can be simultaneously produced in a collective substrate state while preventing cracks due to warping of the substrates.
- a method of thinning the substrate a method of cutting the chip by dicing after grinding the other main surface of the substrate opposite to the hollow space to a desired thickness is common.
- this method there is a problem that the substrate is greatly warped when it is thinned due to residual stress of a support layer, a cover layer, and the like that form a hollow space. Since the substrate in which the hollow space is formed is grooved in the first main surface side of the substrate halfway first, and the other main surface of the substrate is thinned by grinding, the substrate does not greatly warp at the time of thinning. , Cracks due to substrate warpage can be prevented.
- the support layer, the cover layer, and the protective layer may be cut when the groove is formed in the substrate.
- the substrate may be divided into chips by thinning until reaching the groove, or may be divided into chips by bending the substrate along the groove after thinning the substrate until reaching the groove.
- the present invention also provides a method of manufacturing an acoustic wave device configured as follows.
- the method for manufacturing an acoustic wave device includes (1) a first step of forming a vibration part and a pad electrically connected to an electrode of the vibration part on one main surface of the substrate, and (2) the vibration.
- a sheet-like composite layer in which a sheet-like cover layer made of a resin containing synthetic rubber and a protective layer made of a resin having flux resistance are laminated in advance, and the support layer with respect to the cover layer Is provided so that the protective layer is disposed on the opposite side, and a hollow space is formed around the vibrating part, (4) (4) the protective layer and the cover layer of the composite layer, and the Via conductors that penetrate through the support layer and are connected to the pads
- To comprises a fourth step, and (5) providing an external electrode composed of the solder to the end portion of the protective layer-side bumps of the via conductor, the fifth step.
- flux is applied to the solder bumps to improve solder wettability. Since the flux passes through the cover layer made of a resin containing synthetic rubber, the flux may flow into the hollow space only with the cover layer. On the other hand, when a protective layer made of a resin having flux resistance is provided on the cover layer as in the present invention, the flux does not pass through the protective layer made of a resin having flux resistance, so that the flux flows into the hollow space. You can avoid it.
- (6) a sixth step of forming a groove at a depth from the one main surface of the substrate to the middle of the substrate, and (7) the other of the substrate opposite to the one main surface.
- a plurality of acoustic wave devices having thin substrates can be simultaneously produced in a collective substrate state while preventing cracks due to warping of the substrates.
- a method of thinning the substrate a method of cutting the chip by dicing after grinding the other main surface of the substrate opposite to the hollow space to a desired thickness is common.
- this method there is a problem that the substrate is greatly warped when it is thinned due to residual stress of a support layer, a cover layer, and the like that form a hollow space. Since the substrate in which the hollow space is formed is grooved in the first main surface side of the substrate halfway first, and the other main surface of the substrate is thinned by grinding, the substrate does not greatly warp at the time of thinning. , Cracks due to substrate warpage can be prevented.
- the support layer, the cover layer, and the protective layer may be cut when the groove is formed in the substrate.
- the substrate may be divided into chips by thinning until reaching the groove, or may be divided into chips by bending the substrate along the groove after thinning the substrate until reaching the groove.
- the protective layer when the elastic wave device is mounted using the solder bump, the protective layer can prevent the flux from flowing into the hollow space of the elastic wave device.
- Example 1 An electronic component 30 of Example 1 will be described with reference to FIGS. 1 to 4 and FIG.
- two surface wave devices 10 are mounted on the upper surface 40 a side which is one main surface of the common substrate 40. That is, the land 42 formed on the upper surface 40 a of the common substrate 40 and the surface acoustic wave device 10 are electrically connected via the solder bumps 18.
- a resin 32 is disposed around the surface wave device 10, and the surface wave device 10 is covered with the resin 32.
- an external electrode 44 for mounting the electronic component 30 on another circuit substrate or the like is exposed.
- a via conductor 46 and an internal wiring pattern 48 that electrically connect the land 42 and the external electrode 44 are formed inside the common substrate 40.
- the electronic component 30 is a duplexer, and a surface acoustic wave filter element for transmission and reception is mounted side by side on the common substrate 40 as the surface acoustic wave device 10.
- the surface wave device 10 has an element part, for example, a SAW (Surface Acoustic Wave) filter formed on a piezoelectric substrate 11. That is, on the upper surface 11 a which is one main surface of the piezoelectric substrate 11, there is an IDT (Inter Digital Transducer) electrode 12 which is a comb-like electrode of the vibration unit 14, a pad 13, and between the IDT electrode 12 and the pad 13. A conductive pattern including a wiring (not shown) for connecting the two is formed.
- a support layer 20 is formed in a frame shape around the vibrating portion 14 on which the IDT electrode 12 is formed. The thickness of the support layer 20 is larger than the thickness of the conductive pattern such as the IDT electrode 12 of the vibration unit 14. The support layer 20 is also formed on the pad 13.
- a cover layer 22 is disposed on the support layer 20, and the periphery of the vibration part 14 formed on the piezoelectric substrate 11 is covered with the support layer 20 and the cover layer 22, which are insulating members, and a hollow space 19 is formed. Is done. A surface acoustic wave freely propagates in a portion adjacent to the hollow space 19 in the upper surface 11 a of the piezoelectric substrate 11. A protective layer 24 is formed on the cover layer 22.
- via holes (through holes) 15 reaching the pads 13 formed on the upper surface 11 a of the piezoelectric substrate 11 are formed.
- the via hole 15 is filled with an under bump metal 16 as a via conductor, and a solder bump 18 exposed to the outside is formed on the under bump metal 16.
- the surface acoustic wave device 10 is manufactured in batches in a state of a collective substrate (wafer).
- an IDT electrode 12 and a pad 13 and wiring (not shown) for connecting the IDT electrode 12 and the pad 13 are included on one main surface 11 a of the piezoelectric substrate 11.
- the support layer 20 is formed around the vibrating portion 14 where the IDT electrode 12 is formed.
- a photosensitive polyimide resin is applied to the entire main surface 11a of the piezoelectric substrate 11 in the support layer 20, and then the periphery of the vibrating portion 14 on which the IDT electrode 12 is formed is opened (removed) by photolithography.
- a sheet-like cover layer 22 is formed on the support layer 22 by lamination or the like.
- a cover layer 22 for example, a non-photosensitive epoxy film resin that enables a low-temperature curing process is used.
- a protective layer 24 is formed on the cover layer 22.
- a photosensitive polyimide resin that is the same material as the support layer 20 is used.
- a sheet-like composite layer in which the sheet material to be the cover layer 22 and the sheet material to be the protective layer 24 are laminated in advance is provided on the support layer 22.
- the cover layer 22 and the protective layer 24 may be formed simultaneously.
- a via hole 15 is formed by laser processing, penetrating the protective layer 24, the cover layer 22, and the support layer 20 and exposing the pad 13 at the bottom.
- an under bump metal 16 is formed by electrolytic plating (Cu, Ni, etc.) as a via conductor filling the via hole 15, and oxidation is prevented on the surface 16a of the under bump metal 16.
- Au having a thickness of about 0.05 to 0.1 ⁇ m is formed.
- solder paste such as Sn—Ag—Cu is printed directly on the under bump metal 16 through a metal mask, and the solder paste melts at a temperature of about 260 ° C., for example.
- the solder is fixed to the under bump metal 16 by heating at, and the flux is removed by a flux cleaning agent to form a spherical solder bump 18.
- the piezoelectric substrate 11 is thinned by grinding from the substrate back surface (the other main surface) 11 b and divided into chips, The preparation of the surface acoustic wave device 10 shown in FIG. 4 is completed.
- the support layer 20, the cover layer 22, and the protective layer 24 may be cut.
- the piezoelectric substrate 11 is divided into chips by thinning until reaching the groove, but the piezoelectric substrate 11 is thinned until reaching the groove and then divided into chips by bending the piezoelectric substrate 11 along the groove. Also good.
- a method of thinning the piezoelectric substrate 11 As a method of thinning the piezoelectric substrate 11, a method of cutting a chip by dicing after grinding the substrate back surface 11b opposite to the hollow space 19 to a desired thickness is common. In this method, there is a problem that the piezoelectric substrate 19 in a collective substrate state is warped and cracked due to the residual stress of the resin such as the support layer 20 and the cover layer 22 forming the hollow space 19 at the time of thinning. In the piezoelectric substrate 11 in which the hollow space 19 is formed, if the substrate back surface 11b is thinned by grinding after first grooved in the middle of the one main surface 11a side of the piezoelectric substrate 11, the piezoelectric substrate 11 becomes large at the time of thinning. Since it does not warp, it is possible to prevent cracking due to warping of the piezoelectric substrate 11.
- a process for manufacturing the electronic component 30 by mounting the produced surface acoustic wave device 10 will be described.
- a plurality of electronic components 30 are manufactured together in a collective substrate state.
- the surface acoustic wave device 10 is mounted on the printed circuit board that becomes the common substrate 40.
- the solder bumps 18 are fluxed to improve solder wettability.
- the surface wave device 10 is embedded in the resin 32 in a pressurized state of 2 to 5 Pa by lamination or a resin molding method, and then divided to complete the electronic component 30 shown in FIG.
- the thickness of the support layer 20 is 15 ⁇ m
- the thickness of the cover layer 22 is 30 ⁇ m
- the thickness of the protective layer 24 is 3 ⁇ m.
- the cover layer 22 is made of a resin sheet material containing synthetic rubber, for example, a non-photosensitive epoxy resin sheet material.
- the cover layer 22 has a sticky shape due to the addition of synthetic rubber, and is difficult to crack.
- the flux passes through the cover layer 22 made of a resin containing synthetic rubber such as acrylic rubber.
- the light may permeate and flow into the hollow space 19.
- the material of the protective layer 24 and the support layer 20 may be different. However, when the support layer 20 is made of a resin having flux resistance, if the same material as the support layer 20 is used for the protective layer 24, the types of materials increase. Therefore, the manufacturing process can be simplified, which is preferable.
- the mounting accuracy can be improved by recognizing and mounting the solder bump 18 rather than recognizing and mounting the external shape of the surface acoustic wave device 10 affected by the dicing accuracy. it can.
- the protective layer 24 is made of the same photosensitive polyimide resin as that of the support layer 20, the difference in luminance profile between the solder bump 18 and the protective layer 24 becomes large, and it is easy to recognize the solder bump 18. Therefore, the surface acoustic wave device 10 can be mounted with higher accuracy than when the external shape of the surface acoustic wave device 10 is recognized.
- the protective layer 24 is not intended to ensure airtightness of the hollow space 19.
- the support layer 20 When forming the support layer 20, it is possible to form an opening in the via portion so that at least a part of the pad 13 is exposed.
- a via hole penetrating the cover layer and the protective layer is formed by laser processing, a part of the material of the cover layer ( There is a problem that the filler or the like) adheres to the bottom of the via hole, that is, the pad, and adversely affects the adhesion between the plating filled in the via hole and the pad.
- the via hole is formed in the support layer together with the cover layer and the protective layer by laser processing after forming the cover layer and the protective layer without forming the opening of the via portion when forming the support layer, such a problem does not occur, and the via hole is not formed.
- the adhesion between the filling plating and the pad is improved.
- the hollow space 19 needs to have a size of 400 ⁇ m ⁇ 1000 ⁇ m in order to realize an 800 MHz band SAW filter that requires the largest size in a frequency band in which a general SAW filter is used.
- the parameters of the support layer 20 and the cover layer 22 may be selected so as to satisfy the following conditions.
- Example 2 The surface acoustic wave device 10a of Example 2 will be described with reference to FIG.
- the surface wave device 10a according to the second embodiment has the following configuration added to the same configuration as the surface wave device 10 according to the first embodiment.
- an intermediate layer 26 is formed between the piezoelectric substrate 11 and the support layer 20.
- the intermediate layer 26 is formed in a region other than the vibration part 14a including the IDT electrode 12 and the pad 13, and is interposed between the piezoelectric substrate 11 and the support layer 20 so as to surround the periphery of the vibration part 14a.
- the intermediate layer 26 improves the adhesion.
- an SiO 2 film is formed by sputtering, and then an SiO 2 film such as a region where the vibrating portion 14a and the pad 13 are formed.
- the intermediate layer 26 of the SiO 2 film is formed by removing the SiO 2 film by a dry etching method.
- a SiN film may be formed instead of the SiO 2 film.
- the support layer 20 and the like are formed in the same manner as in Example 1.
- the intermediate layer 26 of the SiO 2 film or the SiN film has a rougher surface than the piezoelectric substrate 11, the adhesion strength is improved by the anchor effect.
- These films can be formed by sputtering or CVD (chemical vapor deposition).
- a liquid-tight level can be secured for the hollow space 19.
- the intermediate layer 26 only needs to ensure a liquid-tight level. Since the material itself of the support layer 20 and the cover layer 22 is not airtight, the purpose is not to improve the airtightness.
- SiO 2 film When removing the SiO 2 film may be removed SiO 2 film to the outside from a region where the pad 13 is formed.
- a part of the support layer 20 is formed on the piezoelectric substrate 11 around the pad 13, but an intermediate layer 26 is interposed between the other part of the support layer 20 and the piezoelectric substrate 11.
- the intermediate film 26 interposed between the piezoelectric substrate 11 and the support layer 20 may be formed on the IDT electrode 12 side so as to surround the periphery of the vibrating portion 14a.
- Example 3 The electronic component 30x of Example 3 will be described with reference to FIGS.
- the electronic component 30x of the third embodiment is configured in substantially the same manner as the electronic component 30 of the first embodiment. Below, it demonstrates centering around difference with Example 1, and uses the same code
- the electronic component 30x of the third embodiment is different from the electronic component 30 of the first embodiment in that the surface wave device 10 and the bulk acoustic wave device 10x are mounted on the upper surface 40a side that is one main surface of the common substrate 40. That is, the land 42 formed on the upper surface 40 a of the common substrate 40 and the surface wave device 10 and the bulk acoustic wave device 10 x are electrically connected via the solder bumps 18.
- a resin 32 is disposed around the surface acoustic wave device 10 and the bulk acoustic wave device 10 x, and the surface acoustic wave device 10 and the bulk acoustic wave device 10 x are covered with the resin 32.
- An external electrode 44 for mounting the electronic component 30x on another circuit board or the like is exposed on the lower surface 40b side which is the other main surface of the common substrate 40.
- a via conductor 46 and an internal wiring pattern 48 that electrically connect the land 42 and the external electrode 44 are formed inside the common substrate 40.
- the electronic component 30x is a duplexer
- the surface acoustic wave device 10 is a surface acoustic wave filter element
- the bulk acoustic wave device 10x is a bulk acoustic wave filter element, one for transmission and the other for reception.
- the bulk acoustic wave device 10x is configured in substantially the same manner as the surface acoustic wave device 10 of Example 1 except that the vibrating portion 14x is formed on an insulating substrate 11x such as Si.
- the bulk acoustic wave device 10 x has the same package structure as the surface wave device 10.
- a support layer 20 is formed in a frame shape around the vibrating portion 14x on one main surface 11s of the substrate 11x on which the vibrating portion 14x is formed.
- the thickness of the support layer 20 is larger than the thickness of the vibration part 14x.
- the support layer 20 is also formed on the pad 13.
- a cover layer 22 is disposed on the support layer 20, and the periphery of the vibrating portion 14 x is covered with the support layer 20 and the cover layer 22, which are insulating members, and a hollow space 19 is formed.
- a protective layer 24 is formed on the cover layer 22.
- Via holes (through holes) 15 that reach the pads 13 are formed in the protective layer 24, the cover layer 22, and the support layer 20.
- the via hole 15 is filled with an under bump metal 16 as a via conductor, and a solder bump 18 exposed to the outside is formed on the under bump metal 16.
- Such a package structure is not limited to the SMR type bulk acoustic wave device of the third embodiment, but the type in which the vibration part is disposed on the cavity formed in the substrate, the vibration part is removed by removing the sacrificial layer, or the like.
- the present invention can also be applied to a bulk acoustic wave device that is supported in a floating state from the substrate.
- the bulk acoustic wave device 10x includes a vibrating part in which a piezoelectric thin film 12s is sandwiched between an upper electrode 12a and a lower electrode 12b, as shown in the cross-sectional view of the main part in FIG. 14x.
- the vibration part 14x is acoustically separated from the insulating substrate 11x via the acoustic reflector 17.
- the acoustic reflector 17 has a low acoustic impedance layer 17s having a relatively low acoustic impedance and a high acoustic impedance layer 17t having a relatively high acoustic impedance stacked alternately on the insulating substrate 11x.
- the upper electrode 12a and the lower electrode 12b are electrically connected to the pad 13 (not shown in FIG. 7).
- the pad 13 may be formed directly on the main surface 11s of the insulating substrate 11x or may be formed on the main surface 11s of the insulating substrate 11x via another layer (for example, the low acoustic impedance layer 17s). .
- the piezoelectric substrate is not limited to the SAW filter, and an element portion such as a SAW resonator may be formed.
- the insulating substrate is not limited to the BAW filter, and an element portion such as a BAW resonator may be formed.
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Abstract
Description
10x バルク音響波装置(弾性波装置)
11 圧電基板
11a 絶縁基板
12 IDT電極
12a 上部電極
12b 下部電極
12c 圧電薄膜
13 パッド
14,14a,14x 振動部
15 ビアホール
16 アンダーバンプメタル(ビア導体)
18 はんだバンプ(外部電極)
19 中空空間
20 支持層
22 カバー層
24 保護層
26 中間層(窒化膜又は酸化膜)
カバー層の材料の弾性率 ≧ 3 GPa
支持層の厚み ≧ 10 μm
支持層の材料の弾性率 ≧ 2.5 GPa
なお、保護層24はカバー層22に比べて薄くてよいため、中空空間19を潰れなくする条件として保護層24の厚みや保護層24の材料の弾性率は無視することができる。
Claims (11)
- 基板と、
前記基板の一方主面に形成された振動部と、
前記基板の一方主面に形成され、前記振動部の電極に電気的に接続されたパッドと、
前記振動部の周囲を囲むように前記基板の前記一方主面に設けられ、前記振動部の厚みよりも大きい厚みを有する、支持層と、
前記振動部を覆うように前記支持層の上に設けられ前記振動部の周囲に中空空間を形成する、合成ゴムを含む樹脂からなるシート状の、カバー層と、
前記カバー層の前記支持層とは反対側に設けられ、フラックス耐性を有する樹脂からなる、保護層と、
前記保護層、前記カバー層及び前記支持層を貫通し、前記パッドに接続される、ビア導体と、
前記ビア導体の前記保護層側の端部に設けられ、はんだバンプからなる、外部電極と、
を備えたことを特徴とする、弾性波装置。 - 前記基板は圧電基板であり、
前記振動部はIDT電極を含むことを特徴とする、請求項1に記載の弾性波装置。 - 前記基板は絶縁基板であり、
前記振動部は両面に電極が形成された圧電薄膜を含むことを特徴とする、請求項1に記載の弾性波装置。 - 前記保護層は、前記支持層と同じ材料からなることを特徴とする、請求項1、2又は3に記載の弾性波装置。
- 前記保護層は、感光性ポリイミド系樹脂からなることを特徴とする、請求項1、2又は3に記載の弾性波装置。
- 前記カバー層は、非感光性エポキシ樹脂からなることを特徴とする、請求項1、2又は3に記載の弾性波装置。
- 前記基板と前記支持層との間の少なくとも一部に介在する窒化膜又は酸化膜をさらに備えたことを特徴とする、請求項1、2又は3に記載の弾性波装置。
- 基板の一方主面に、振動部と該振動部の電極に電気的に接続されたパッドとを形成する、第1の工程と、
前記振動部の周囲を囲むように、前記基板の前記一方主面に、前記振動部の厚みよりも大きい厚みを有する支持層を形成する、第2の工程と、
前記振動部を覆うように前記支持層の上に、合成ゴムを含む樹脂からなるシート状のカバー層を設けて、前記振動部の周囲に中空空間を形成する、第3の工程と、
前記カバー層の前記支持層とは反対側に、フラックス耐性を有する樹脂からなる保護層を設ける、第4の工程と、
前記保護層、前記カバー層及び前記支持層を貫通し、前記パッドに接続されるビア導体を形成する、第5の工程と、
前記ビア導体の前記保護層側の端部にはんだバンプからなる外部電極を設ける、第6の工程と、
を備えたことを特徴とする、弾性波装置の製造方法。 - 基板の一方主面に、振動部と該振動部の電極に電気的に接続されたパッドとを形成する、第1の工程と、
前記振動部の周囲を囲むように前記基板の前記一方主面に設けられ、前記振動部の厚みよりも大きい厚みを有する支持層を形成する、第2の工程と、
前記振動部を覆うように前記支持層の上に、合成ゴムを含む樹脂からなるシート状のカバー層とフラックス耐性を有する樹脂からなる保護層とを予め積層したシート状の複合層を、前記カバー層に関して前記支持層とは反対側に前記保護層が配置されるように設けて、前記振動部の周囲に中空空間を形成する、第3の工程と、
前記複合層の前記保護層及び前記カバー層と前記支持層とを貫通し、前記パッドに接続されるビア導体を形成する、第4の工程と、
前記ビア導体の前記保護層側の端部にはんだバンプからなる外部電極を設ける、第5の工程と、
を備えたことを特徴とする、弾性波装置の製造方法。 - 前記基板の前記一方主面から前記基板の途中までの深さに溝を形成する、第7の工程と、
前記基板の前記一方主面とは反対側の他方主面を研削して、前記基板を薄化してチップに分割する、第8の工程と、
を備えたことを特徴とする、請求項8に記載の弾性波装置の製造方法。 - 前記基板の前記一方主面から前記基板の途中までの深さに溝を形成する、第6の工程と、
前記基板の前記一方主面とは反対側の他方主面を研削して、前記基板を薄化してチップに分割する、第7の工程と、
を備えたことを特徴とする、請求項9に記載の弾性波装置の製造方法。
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DE112016002835B4 (de) | 2015-06-25 | 2023-02-02 | Murata Manufacturing Co., Ltd. | Vorrichtung für elastische Wellen |
JPWO2017098809A1 (ja) * | 2015-12-11 | 2018-08-30 | 株式会社村田製作所 | 弾性波装置 |
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US10586778B2 (en) | 2016-04-11 | 2020-03-10 | Murata Manufacturing Co., Ltd. | Elastic wave element and elastic wave apparatus |
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Also Published As
Publication number | Publication date |
---|---|
US20130205586A1 (en) | 2013-08-15 |
US8461940B2 (en) | 2013-06-11 |
JP5077714B2 (ja) | 2012-11-21 |
CN101946409A (zh) | 2011-01-12 |
EP2246979A1 (en) | 2010-11-03 |
CN101946409B (zh) | 2014-08-20 |
US20100289600A1 (en) | 2010-11-18 |
JPWO2009104438A1 (ja) | 2011-06-23 |
EP2246979A4 (en) | 2014-03-05 |
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