JP6743830B2 - 弾性波装置 - Google Patents
弾性波装置 Download PDFInfo
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- JP6743830B2 JP6743830B2 JP2017554960A JP2017554960A JP6743830B2 JP 6743830 B2 JP6743830 B2 JP 6743830B2 JP 2017554960 A JP2017554960 A JP 2017554960A JP 2017554960 A JP2017554960 A JP 2017554960A JP 6743830 B2 JP6743830 B2 JP 6743830B2
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Description
[1.1 弾性波装置1の構成]
図1は、実施の形態1に係る弾性波装置1の断面図である。同図に示された弾性波装置1は、圧電基板10と、振動部12と、電極パッド13と、支持層15と、第1カバー層16と、第2カバー層17と、アンダーバンプメタル(以下、UBMと記す)21と、バンプ20とを備える。本実施の形態に係る弾性波装置1は、弾性波の伝搬機能を有する圧電基板10がパッケージ機能を兼ねた、いわゆるWLP(Wafer Level Package)構造を有し、小型化かつ低背化を実現している。このような弾性波装置1は、例えば、所定の周波数帯域の高周波信号を選択的に通過させる弾性表面波(SAW:Surface Acoustic Wave)フィルタに適用される。
図2Aは、実施の形態1に係る弾性波装置1のバンプ付近の断面図である。また、図2Bは、比較例に係る弾性波装置500のバンプ付近の断面図である。図2Aに示すように、本実施の形態に係る弾性波装置1では、UBM21のバンプ20との接合面の形状は、バンプ20側に凸の球面形状となっている。一方、図2Bに示すように、比較例に係る弾性波装置500では、UBM521のバンプ520との接合面の形状は、平面形状となっている。
図3は、実施の形態1の変形例1に係る弾性波装置1Aの断面図である。同図に示された弾性波装置1Aは、圧電基板10と、振動部12Aと、電極パッド13と、支持層15と、第1カバー層16と、第2カバー層17と、UBM23と、バンプ22とを備える。同図に示された弾性波装置1Aは、実施の形態1に係る弾性波装置1と比較して、UBM23が充填されるビアホール18Aの形状が異なる。以下、変形例1に係る弾性波装置1Aについて、弾性波装置1と同じ構成は説明を省略し、異なる構成を中心に説明する。
図4は、実施の形態1の変形例2に係る弾性波装置1Bのバンプ付近の断面図である。弾性波装置1Bは、圧電基板10と、振動部12Aと、電極パッド13と、支持層15と、第1カバー層16と、第2カバー層17と、UBM25と、バンプ24とを備える。本変形例に係る弾性波装置1Bは、実施の形態1に係る弾性波装置1と比較して、UBM25とバンプ24との接合面の、カバー部材に対する相対高さが異なる。以下、変形例2に係る弾性波装置1Bについて、弾性波装置1と同じ構成は説明を省略し、異なる構成を中心に説明する。
ここでは、変形例2に係る弾性波装置1Bと比較例に係る弾性波装置500とを、以下のように作製し、耐熱衝撃性を評価した結果を説明する。
[2.1 弾性波装置2の構成]
本実施の形態に係る弾性波装置2は、実施の形態1に係る弾性波装置と同様にWLP構造を有するものであるが、IDT電極11が形成された圧電基板10の表面側にバンプが形成されるのではなく、圧電基板の裏面側にバンプが形成される構造を有する。
[3.1 弾性波装置3の構成]
本実施の形態に係る弾性波装置3は、実施の形態1および2に係る弾性波装置がWLP構造を有するのに対して、CSP構造を有する。
以上、本発明の実施の形態に係る弾性波装置について、実施の形態および変形例を挙げて説明したが、本発明の弾性波装置は、上記実施の形態および変形例に限定されるものではない。上記実施の形態および変形例における任意の構成要素を組み合わせて実現される別の実施の形態や、上記実施の形態および変形例に対して本発明の主旨を逸脱しない範囲で当業者が思いつく各種変形を施して得られる変形例や、本開示の弾性波装置を内蔵した各種機器も本発明に含まれる。
4 弾性波素子
5 外部実装基板
10 圧電基板
10a、50a 表面
10b、50b 裏面
11、511 IDT電極
12、12A、512 振動部
13、41 電極パッド
14、514 中空空間
15、26、515 支持層
16 第1カバー層
17 第2カバー層
18、18A、19、518 ビアホール
20、22、24、28、30、40、520 バンプ
21、23、25、29 UBM(アンダーバンプメタル)
27、516 カバー層
31、42、53 ランド電極
32 封止部材
46 基板ビア導体
48 内部配線パターン
50 実装基板
510 基板
510a、510b 主面
511 電極
513 パッド
517 保護層
520 外部電極
521 ビア導体
Claims (3)
- 圧電基板と、
前記圧電基板の表面上に形成された機能電極と、
前記圧電基板の表面上に形成された電極パッドと、
前記圧電基板の表面上に、前記機能電極を囲むように形成された支持部材と、
前記支持部材上に形成されており、前記支持部材および前記圧電基板と共に前記機能電極を中空空間で封止しているカバー部材と、
前記電極パッドに接合されたビア導体と、
前記ビア導体上に接合されたバンプと、を備え、
前記ビア導体における前記バンプとの接合面における形状は、前記バンプ側に凸の曲面形状であり、
前記ビア導体の材料と前記バンプの材料とは、異なっており、
前記ビア導体は、前記カバー部材の内側面と接触しており、
前記ビア導体と前記バンプとの接合面の端部が、前記内側面と接触しており、
前記ビア導体の前記バンプとの接合面における凸部は、前記カバー部材よりも突出している、
弾性波装置。 - 前記ビア導体は、前記カバー部材及び前記支持部材を貫通し、
前記バンプは、前記カバー部材から突出するように形成されている、
請求項1に記載の弾性波装置。 - 前記ビア導体は、前記バンプとの接合面における凸部を除き、前記電極パッドとの接続面から前記バンプとの接合面に向かうにつれて、前記圧電基板の面方向の断面積が大きくなっている、
請求項1または2に記載の弾性波装置。
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