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  "updated": "2026-08-13",
  "license": "© 2026 Yutaka Sugiura. All rights reserved.",
  "attribution": "The社史 (the-shashi.com) — https://the-shashi.com/tse/6925/",
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    "extraction": "有価証券報告書の沿革を基礎に、社史・報道で補完",
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    {
      "date": "1964/3",
      "importance": 3,
      "event": "ウシオ電機設立、資本金12,500千円",
      "source": "有価証券報告書"
    },
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      "date": "1968/9",
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      "event": "横浜市に生産技研横浜事業所を新設",
      "source": "有価証券報告書"
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      "date": "1970/5",
      "importance": 1,
      "event": "東京証券取引所市場第２部上場",
      "source": "有価証券報告書"
    },
    {
      "date": "1970/5",
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      "event": "姫路市に播磨事業所を新設",
      "source": "有価証券報告書"
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      "event": "大阪証券取引所市場第２部上場",
      "source": "有価証券報告書"
    },
    {
      "date": "1980/9",
      "importance": 2,
      "event": "東京及び大阪証券取引所市場第１部上場",
      "source": "有価証券報告書"
    },
    {
      "date": "1983/6",
      "importance": 1,
      "event": "ランプ製造の兵庫ウシオ電機を設立",
      "source": "有価証券報告書"
    },
    {
      "date": "1987/4",
      "importance": 1,
      "event": "アメリカにランプ製造のUSHIO OREGONを設立",
      "source": "有価証券報告書"
    },
    {
      "date": "1988/12",
      "importance": 1,
      "event": "御殿場市に御殿場事業所を新設",
      "source": "有価証券報告書"
    },
    {
      "date": "1990/10",
      "importance": 2,
      "event": "ドイツのBLV Licht- und Vakuumtechnikを買収",
      "source": "有価証券報告書"
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    {
      "date": "1992/4",
      "importance": 3,
      "event": "アメリカのChristie Electricの映写機部門を買収",
      "source": "有価証券報告書"
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      "date": "1996/1",
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      "source": "有価証券報告書"
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      "date": "1997/7",
      "importance": 1,
      "event": "ウシオ総合技術研究所を設立",
      "source": "有価証券報告書"
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    {
      "date": "1999/9",
      "importance": 2,
      "event": "カナダのElectrohomeの映像機器事業部門を買収",
      "source": "有価証券報告書"
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      "date": "2000/8",
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      "event": "エキシマレーザー開発のギガフォトンを設立",
      "source": "有価証券報告書"
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    {
      "date": "2004/3",
      "importance": 1,
      "event": "中国に光学装置製造のUSHIO (SUZHOU)を設立",
      "source": "有価証券報告書"
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      "date": "2005/7",
      "importance": 2,
      "event": "ドイツのXTREME technologiesの持分50％を取得",
      "source": "有価証券報告書"
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      "date": "2005/10",
      "importance": 1,
      "event": "ポーランドのランプ製造Natriumを買収",
      "source": "有価証券報告書"
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    {
      "date": "2008/1",
      "importance": 1,
      "event": "LED製造のエピテックスを買収",
      "source": "有価証券報告書"
    },
    {
      "date": "2009/5",
      "importance": 2,
      "event": "アメリカの半導体レーザー開発Necselを買収",
      "source": "有価証券報告書"
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    {
      "date": "2009/12",
      "importance": 1,
      "event": "アメリカの医療機器製造Luminetxを買収",
      "source": "有価証券報告書"
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      "date": "2011/5",
      "importance": 3,
      "event": "ギガフォトンの保有全株式を小松製作所に譲渡",
      "source": "有価証券報告書"
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    {
      "date": "2012/3",
      "importance": 2,
      "event": "アドテックエンジニアリングを公開買付けで連結子会社化",
      "source": "有価証券報告書"
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      "date": "2014/7",
      "importance": 1,
      "event": "半導体レーザー製造のウシオオプトセミコンダクターを設立",
      "source": "有価証券報告書"
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      "date": "2015/4",
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      "event": "照明器具販売のマックスレイを買収",
      "source": "有価証券報告書"
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      "date": "2016/3",
      "importance": 1,
      "event": "アメリカの半導体レーザー開発PD-LDを買収",
      "source": "有価証券報告書"
    },
    {
      "date": "2016/4",
      "importance": 1,
      "event": "スキンケア製品販売のサンソリットを買収",
      "source": "有価証券報告書"
    },
    {
      "date": "2022/4",
      "importance": 1,
      "event": "東京証券取引所の市場区分見直しでプライム市場に移行",
      "source": "有価証券報告書"
    },
    {
      "date": "2023/4",
      "importance": 1,
      "event": "ヤナカホールディングスを買収",
      "source": "有価証券報告書"
    },
    {
      "date": "2026/3",
      "importance": 2,
      "event": "ドイツのランプ製造OSRAM ENIを買収",
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