JP6858590B2 - 水晶発振器及び水晶発振器の製造方法 - Google Patents
水晶発振器及び水晶発振器の製造方法 Download PDFInfo
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Description
<水晶発振器100の構成>
図1は、水晶発振器100の斜視図である。水晶発振器100は、第1層110と、第2層120と、を有しており、第1層110と第2層120とが互いに接合材130を介して接合されることにより形成されている。水晶発振器100は、例えば、外形が略直方体形状に形成されている。以降では、水晶発振器100の長辺が伸びる方向をX軸方向、短辺が伸びる方向をZ軸方向、主面に垂直な方向をY軸方向として説明する。
図3は、水晶発振器100の製造方法が示されたフローチャートである。図4及び図5には、図3のフローチャートを説明するための図が示されている。また、図6は、第1基板の製造方法が示されたフローチャートである。図7及び図8には、図6のフローチャートを説明するための図が示されている。以下に、図3から図8を参照して、水晶発振器100の製造方法について説明する。
図6は、第1基板W100の製造方法が示されたフローチャートである。また、図7及び図8には、図6のフローチャートを説明するための図が示されている。以下に、図6から図8を参照して、図3のステップS101で用意される第1基板W110の製造方法について説明する。
水晶振動子は、様々な形状に形成されても良い。以下に、−Y軸側の面が実装面となる水晶発振器の変形例について説明する。
図9は、水晶発振器200の概略断面図である。水晶発振器200は、−Y軸側の面が実装面となるように形成される点で水晶発振器100とは異なっている。図9は、図2(a)に対応する部分の水晶発振器200の断面図である。水晶発振器200は、第1層210と第2層220とが接合材により接合されることにより形成されている。第1層210は、水晶振動子140が絶縁性樹脂160で覆われることにより形成されているが、水晶発振器100とは異なり、ビア111が形成されておらず導電性充填材112が充填されていない。また、第2層220には、第2層220をY軸方向に貫通するシリコン貫通電極(TSV)211が形成されている。さらに第2層220には、第2層220の−Y軸側の面に絶縁層221が形成されると共に第2層220TSV211に電気的に接続されるように半田ボール150が形成されている。水晶発振器200は、−Y軸側の面が実装面となっている。
110、210 … 第1層
111 … ビア
112 … 導電性充填材
120、220 … 第2層
121a、121b … 電極パッド
130 … 接合材
131 … バンプ
132 … 導電性接着剤
140 … 水晶振動子
141 … 水晶振動片
142 … セラミックパケージ
143 … 接続電極
144 … 実装電極
150 … 半田ボール
160 … 絶縁性樹脂
170 … ウエハの型
171 … ウエハの型の縁
172 … スクライブライン
211 … TSV
221 … 絶縁層
W100 … 第3基板
W110 … 第1基板
W120 … 第2基板
Claims (8)
- 所定の周波数で共振する水晶振動片を内包する、主面に垂直な方向から見て第1面積の水晶振動子と、
前記水晶振動子を載置し且つ前記水晶振動片を発振させる発振回路を含み、前記主面に垂直な方向から見て前記第1面積よりも大きな第2面積の集積回路と、
前記集積回路上で前記水晶振動子を覆うように形成され、前記主面に垂直な方向から見て前記第2面積の絶縁性樹脂と、
前記水晶振動子の前記第1面積と重ならない位置で且つ前記集積回路の上面に形成された電極パッドと、
前記集積回路の前記電極パッドから前記絶縁性樹脂を貫通するビア及び該ビアに充填される導電性充填材と、
を有する水晶発振器。 - 前記水晶振動子及び前記絶縁性樹脂を含む第1層と、
前記集積回路により形成される第2層と、を有し、
前記第1層と前記第2層とは互いに接合され、
前記第1層は、前記水晶振動子がバンプを介して前記第2層と電気的に接続されると共に前記第2層との間に接合材が形成されることにより前記第2層に接合されている請求項1に記載の水晶発振器。 - 前記絶縁性樹脂の前記第2層と反対側の面には前記導電性充填材に電気的に接続される半田ボールが形成されている請求項2に記載の水晶発振器。
- 前記水晶振動子は、前記水晶振動片がセラミックパッケージに封入されることにより形成される請求項1から請求項3のいずれか一項に記載の水晶発振器。
- ウエハの型に所定の周波数で共振する水晶振動片を内包し、主面に垂直な方向から見て第1面積を有する複数の水晶振動子を配置する水晶振動子配置工程と、
前記ウエハの型上に配置される前記複数の水晶振動子を絶縁性樹脂で覆い、前記絶縁性樹脂を硬化させる絶縁性樹脂形成工程と、
前記絶縁性樹脂形成工程の後に、前記絶縁性樹脂を貫通する複数のビアを形成するビア形成工程と、
前記ビア形成工程の後に、前記ビアに導電性充填材を充填する導電性充填材充填工程と、
前記複数の水晶振動子及び前記絶縁性樹脂により形成される第1基板を前記ウエハの型から取り外す第1基板取り外し工程と、
前記水晶振動片を発振させる発振回路を含み、前記主面に垂直な方向から見て前記第1面積よりも大きな第2面積の集積回路を複数含む第2基板を形成する第2基板形成工程と、
前記第1基板と前記第2基板とを張り合わせて第3基板を形成する第3基板形成工程と、
前記第3基板を切断して水晶発振器を形成する第3基板切断工程と、を有し、
前記第3基板切断工程の後に、前記絶縁性樹脂は前記主面に垂直な方向から見て前記第2面積に形成され、
前記第3基板形成工程では、前記水晶振動子の前記第1面積と重ならない位置に形成された電極パッドと前記導電性充填材とが電気的に接続される水晶発振器の製造方法。 - 前記第3基板形成工程では、前記第1基板を前記第2基板上にフリップチップ実装すると共に前記第1基板と前記第2基板との間に接合材を形成することにより前記第1基板と前記第2基板とが張り合わせられる請求項5に記載の水晶発振器の製造方法。
- 前記第3基板形成工程の後に、前記第3基板の前記第2基板側を研磨することにより前記第3基板の厚さを調整する第3基板研磨工程を有する請求項5又は請求項6に記載の水晶発振器の製造方法。
- 前記第3基板形成工程では、前記第1基板の前記第2基板とは反対側の面に前記導電性充填材に電気的に接続される半田ボールが形成される請求項5から請求項7のいずれか一項に記載の水晶発振器の製造方法。
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