JP2019149414A - 積層型電子部品の製造方法 - Google Patents
積層型電子部品の製造方法 Download PDFInfo
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- JP2019149414A JP2019149414A JP2018032184A JP2018032184A JP2019149414A JP 2019149414 A JP2019149414 A JP 2019149414A JP 2018032184 A JP2018032184 A JP 2018032184A JP 2018032184 A JP2018032184 A JP 2018032184A JP 2019149414 A JP2019149414 A JP 2019149414A
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Abstract
Description
機能部と導電体部とが積層された素子本体を有する積層型電子部品の製造方法であって、
仮保持膜上にグリーン積層体を形成する工程を含み、
前記グリーン積層体が、
機能性粒子を含む第1のインクを用いてグリーン機能部を形成する第1の工程と、導電体粒子を含む第2のインクを用いてグリーン導電体部を形成する第2の工程とを繰り返して形成され、前記仮保持膜が導電性を有することを特徴とする。
本実施形態に係る製造方法により製造される積層型電子部品の一例として、積層セラミ
ックコンデンサを図1に示す。積層セラミックコンデンサ1は、素子本体10を有しており、図1および図2に示すように、素子本体10は、矩形状の機能部(セラミック層2)と、短手方向および長手方向のどちらにおいても機能部よりも小さく形成された矩形状の導電体部(内部電極層3)と、が交互に積層されて構成されている。素子本体10の両端部には、素子本体10の内部で交互に配置された内部電極層3と各々導通する一対の端子電極4が形成してある。
続いて、本実施形態に係る製造方法の一例について下記に詳細に説明する。本実施形態に係る製造方法では、グリーン積層体は仮保持膜上に形成される。グリーン積層体を仮保持膜上に形成する方法として、仮保持膜上にグリーン積層体を直接描画する方法であれば特に限定されないが、好ましくはインクジェット方式やディスペンサ方式である。インクジェット方式としては、圧電素子の振動によりインク流路を変形させることによりインク液滴を吐出させるピエゾ方式、インク流路内に発熱体を設け、その発熱体を発熱させて気泡を発生させ、気泡によるインク流路内の圧力変化に応じてインク液滴を吐出させるサーマル方式、インク流路内のインクを帯電させてインクの静電吸引によりインク液滴を吐出させる静電吸引方式が挙げられる。またディスペンサ方式では空圧を用いた方式が挙げられる。
吐出装置は、吐出部としての複数のノズルと、電圧印加手段とを備える。吐出装置は少なくとも、第1のインクが供給された複数のノズルを備える第1のヘッド部と、第2のインクが供給された複数のノズルを備える第2のヘッド部とから構成される。本実施形態では、図4に示す剥離基板61上に形成した仮保持膜62上にインクを吐出し、パターンを描画する方法について詳述する。
本実施形態では、上記の吐出装置で用いるインクとして、機能部を構成することとなるグリーン機能部を形成するための第1のインクと、導電体部を構成することとなるグリーン導電体部を形成するための第2のインクとを用いる。以下、第1のインクおよび第2のインクについて説明する。
本実施形態では、第1のインクは、好ましくは機能性粒子と溶媒と樹脂とを含む。第1のインクを調製する方法は特に制限されないが、たとえば、樹脂を溶媒に溶解して樹脂溶液を作製し、この樹脂溶液と機能性粒子とを混合すればよい。第1のインクにおいて、機能性粒子は樹脂溶液中に分散している。
本実施形態では、第2のインクは、好ましくは導電体粒子と溶媒と樹脂とを含む。第2のインクを調製する方法は特に制限されないが、第1のインクを調製する方法と同様にすればよい。
本実施形態では、好ましくは、剥離基板上に仮保持膜を形成し(剥離基板上に仮保持膜を形成する工程)、上記の吐出装置を用いて、仮保持膜上またはグリーン導電体部上に第1のインクによりグリーン機能部を印刷形成し(第1の工程)、形成したグリーン機能部の上に第2のインクによりグリーン導電体部を印刷形成する(第2の工程)。そして、これを繰り返して、グリーン機能部とグリーン導電体部とが交互に積層されたグリーン積層体を得る。さらに、仮保持膜をグリーン積層体とともに剥離基板から剥離する工程を経て、グリーン積層体を仮保持膜とともに熱処理して素子本体を得る。以下、各工程について説明する。
本実施形態では、図4のように、剥離基板61上に仮保持膜62を形成し、該仮保持膜62上にグリーン機能部およびグリーン導電体部を形成してグリーン積層体11を形成する。
L0:試験前の試験片の長さ、L:破断時の試験片の長さ
本実施形態では、グリーン機能部12は仮保持膜62上に形成される。本工程では、吐出装置において、第1のインクが供給された複数のノズル(図3に示す単独のノズル51参照)に印加する電圧を制御することにより、第1のインクに静電吸引力を作用させて、剥離基板61上に形成した仮保持膜62上に第1のインクを吐出して印刷する。まず、図4に示すように、吐出装置のテーブル(図示せず)に剥離基板61およびその上に形成した仮保持膜62を載せる。インクを吐出しながらテーブルを所定量だけ移動することで仮保持膜62上に複数の図形が描画され、電圧の印加を停止すると、インクの吐出が停止し、描画は停止する。これらを繰り返すことで、所望の形状、ここでは矩形状のグリーン機能部12(図3参照)を複数同時に形成することができる。
第2の工程では、第2のインクが充填されたノズルが第1の工程において形成されたグリーン機能部の上に位置するように、テーブルがY軸方向に所定量移動する。あるいは、テーブルを固定し、第2のインクが充填されたノズルが第1の工程において形成されたグリーン機能部の上に位置するようにノズルが移動してもよい。
上記の第1の工程および第2の工程により、グリーン機能部の上にグリーン導電体部を形成し、さらにグリーン導電体部の上にグリーン機能部を形成することを繰り返して、グリーン機能部とグリーン導電体部とが交互に積層されたグリーン積層体を得られる。
本実施形態では、積層型電子部品が有する素子本体10は、仮保持膜上に形成されたグリーン積層体を熱処理することにより得られる積層体を処理して製造される。
本実施形態では、図4に示すように、グリーン積層体11を仮保持膜62上に形成することで、インクのにじみやはじきが少なく、優れた形成精度を確保できる。また、焼結した積層体がセッター等の耐熱性基板に固着するのを低減できる。
上述した実施形態では、積層型電子部品として、積層セラミックコンデンサを例示したが、機能層を構成する材料に応じて、種々の積層型電子部品が例示される。具体的には、積層バリスタ、積層サーミスタ、積層圧電素子、積層インダクタ等が例示される。積層バリスタまたは積層サーミスタの場合には、機能層は半導体セラミック層から構成されており、積層圧電素子の場合には、機能層は圧電セラミックス層から構成されており、積層インダクタの場合には、機能層はフェライト層または軟磁性金属層から構成されている。また、導電体部を構成する材質は、機能部の材料に応じて決定される。
ステンレス鋼板(剥離基板)の上に、メチルエチルケトン(MEK)にブチラール樹脂を溶解した樹脂ビヒクルを用いて、厚さ20μmの樹脂膜を調製し、これを仮保持膜とした。なお、樹脂膜中には、粒径が0.02〜2μmのカーボン粒子が30〜80体積%で含有してあり、仮保持膜のシート抵抗は、10MΩ/□以下であった。また、保持膜の破断強度が1N/m以上であり、破断伸びが3%以上であった。
カーボン粒子を含まない樹脂膜を仮保持膜(シート抵抗が100GΩ/□以上)として用いた以外は、実施例1と同様にして、仮保持膜の上に、グリーン積層体を形成し、剥離試験を行った。
10… 素子本体
2… セラミック層
3… 内部電極層
4… 端子電極
11… グリーン積層体
12… グリーン機能部
13… グリーン導電体部
51… ノズル
61… 剥離基板
62… 仮保持膜
70… 耐熱性基板
Claims (5)
- 機能部と導電体部とが積層された素子本体を有する積層型電子部品の製造方法であって、
仮保持膜上にグリーン積層体を形成する工程を含み、
前記グリーン積層体が、
機能性粒子を含む第1のインクを用いてグリーン機能部を形成する第1の工程と、導電体粒子を含む第2のインクを用いてグリーン導電体部を形成する第2の工程とを繰り返して形成され、
前記仮保持膜が導電性を有することを特徴とする積層型電子部品の製造方法。 - 前記仮保持膜のシート抵抗は、10MΩ/□以下である請求項1に記載の積層型電子部品の製造方法。
- 前記仮保持膜が、樹脂膜中に導電性粒子を含む請求項1または2に記載の積層電子部品の製造方法。
- 剥離基板上に形成された前記仮保持膜上に前記グリーン積層体を形成し、前記仮保持膜を前記剥離基板から剥離する工程を有する請求項1〜3のいずれかに記載の積層型電子部品の製造方法。
- 前記仮保持膜上に形成されたグリーン積層体を前記仮保持膜とともに熱処理して、前記仮保持膜を熱分解させる工程を含む、請求項1〜4のいずれかに記載の積層型電子部品の製造方法。
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