JP2018037576A - プリント配線板及びプリント回路板 - Google Patents
プリント配線板及びプリント回路板 Download PDFInfo
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Abstract
【解決手段】基板と、ランドと、前記ランドよりも細い幅を有し、前記ランドから引き出された配線と、を含む、前記基板の表面に形成された導電層と、前記導電層の上に形成された絶縁層とを有し、前記ランドは、前記基板の前記表面に対して垂直な方向からの上面視において、前記絶縁層により覆われている被覆領域と、前記絶縁層により覆われていない開口領域とを有し、前記配線は、前記上面視において、前記被覆領域と前記開口領域の境界である開口端を含む位置から引き出されていることを特徴とする。
【選択図】図1
Description
本発明の第1実施形態に係るプリント配線板及びプリント回路板について図1(a)、図1(b)及び図1(c)を参照して説明する。各図面で対応する部材又は部分には同一の符号が付されており、以下の説明では、重複する部材又は部分については説明を簡略化又は省略することがある。
ここで、本発明の実施形態の効果をより明確に説明するため、本実施形態と対比する比較例に係るプリント配線板及びプリント回路板について図9(a)、図9(b)、図10(a)及び図10(b)を用いて説明する。
本発明の第2実施形態に係るプリント配線板及びプリント回路板について図2を参照して説明する。図2は、本発明の第2実施形態に係るプリント配線板110の平面図であり、第1実施形態における図1(a)に対応する図面である。本実施形態のプリント配線板110はランド111の形状及び絶縁層113の形状が第1実施形態と異なる。その他の第1実施形態と同様の構成要素については説明を簡略化又は省略する。
本発明の第3実施形態に係るプリント配線板及びプリント回路板について図3を参照して説明する。図3は、本発明の第3実施形態に係るプリント配線板120の平面図であり、第1実施形態における図1(a)に対応する図面である。本実施形態のプリント配線板120は配線122の形状が第1実施形態と異なる。その他の第1実施形態と同様の構成要素については説明を簡略化又は省略する。
本発明の第4実施形態に係るプリント配線板及びプリント回路板について図4を参照して説明する。図4は、第4実施形態に係るプリント配線板130の平面図である。本実施形態では、本発明が適用され得るプリント配線板130及びプリント回路板のより具体的な構成を示す。なお、本実施形態及び後述の第5実施形態においては具体的な寸法、パターン配置及び素子の機能を示す場合があるが、記載のものに限定されるものではなく、これらはプリント回路板の設計に応じて適宜変更可能である。
本発明の第5実施形態に係るプリント配線板及びプリント回路板について図5及び図6を参照して説明する。図5は、第5実施形態に係るプリント配線板150の平面図である。本実施形態では、第4実施形態と同様に、本発明が適用され得るプリント配線板150及びプリント回路板のより具体的な構成を示す。
以下、上述の実施形態の効果をより明確にするため、発明者らが実施したシミュレーション及び信頼性試験の結果を説明する。
図7は、第4実施形態の電子部品が発熱してプリント配線板に反りが生じたときに、配線が受ける応力を有限要素法シミュレーションにより求めた結果を示すグラフである。また、図7には、配線の構造を比較例の構造に変更した場合のシミュレーション結果も併せて比較対象として示されている。ここで、図7に示した応力の値は、配線内のミーゼス応力の最大値である。
図8は、第5実施形態のプリント回路板と、第5実施形態の配線の構造を比較例の構造に変更したプリント回路板のそれぞれを作製して、温度サイクル試験を行った結果を、ワイブル確率グラフに図示したものである。グラフの縦軸は累積故障率であり、横軸は環境温度の上昇及び下降を繰り返したサイクル数である。
101 ランド
102 配線
102a 開口領域
102b 被覆領域
103 絶縁層
103a 開口端
104 基板
Claims (9)
- 基板と、
ランドと、前記ランドよりも細い幅を有し、前記ランドから引き出された配線と、を含む、前記基板の表面に形成された導電層と、
前記導電層の上に形成された絶縁層と
を有し、
前記ランドは、前記基板の前記表面に対して垂直な方向からの上面視において、前記絶縁層により覆われている被覆領域と、前記絶縁層により覆われていない開口領域とを有し、
前記配線は、前記上面視において、前記被覆領域と前記開口領域の境界である開口端を含む位置から引き出されていることを特徴とするプリント配線板。 - 前記ランドと前記配線との間の境界と、前記開口端とは交点を有し、
前記交点における、前記開口領域の内側方向に向かう前記開口端の法線方向と、前記配線が引き出される方向とのなす角は、鋭角又は直角であることを特徴とする請求項1に記載のプリント配線板。 - 前記開口端は、前記上面視において、内側に向かう凹部を有する形状であることを特徴とする請求項1又は2に記載のプリント配線板。
- 前記配線は、前記ランドから螺旋状に離れるように設けられていることを特徴とする請求項1乃至3のいずれか1項に記載のプリント配線板。
- 前記導電層は、少なくとも一部が行列状に設けられた複数のランドを含み、
前記配線は、前記複数のランドのうちの角部に設けられたランドから引き出された配線であることを特徴とする請求項1乃至4のいずれか1項に記載のプリント配線板。 - 前記導電層は、少なくとも一部が行列状に設けられた複数のランドを含み、
前記配線は、前記複数のランドのうちの最外周よりも内側に設けられたランドから引き出された配線であることを特徴とする請求項1乃至4のいずれか1項に記載のプリント配線板。 - 前記絶縁層は、前記プリント配線板にはんだにより電子部品を実装する際に、前記導電層に前記はんだが接続され得る範囲を画定するソルダーレジストであることを特徴とする請求項1乃至6のいずれか1項に記載のプリント配線板。
- 前記ランドの形状は、前記上面視において、円形、楕円形、長円形、長方形、正方形、角部を丸めた長方形又は角部を丸めた正方形であることを特徴とする請求項1乃至7のいずれか1項に記載のプリント配線板。
- 請求項1乃至8のいずれか1項に記載のプリント配線板と、
前記プリント配線板にはんだにより実装された電子部品と
を有することを特徴とするプリント回路板。
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US15/672,065 US10582615B2 (en) | 2016-09-01 | 2017-08-08 | Printed wiring board, printed circuit board, and electronic device |
US16/749,179 US10897820B2 (en) | 2016-09-01 | 2020-01-22 | Printed wiring board, printed circuit board, and electronic device |
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JP2022173486A (ja) * | 2020-09-28 | 2022-11-18 | キヤノン株式会社 | プリント回路板及び電子機器 |
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