JP6575065B2 - 発光装置 - Google Patents
発光装置 Download PDFInfo
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- JP6575065B2 JP6575065B2 JP2014264717A JP2014264717A JP6575065B2 JP 6575065 B2 JP6575065 B2 JP 6575065B2 JP 2014264717 A JP2014264717 A JP 2014264717A JP 2014264717 A JP2014264717 A JP 2014264717A JP 6575065 B2 JP6575065 B2 JP 6575065B2
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- light emitting
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Description
発光色の異なる3つの発光素子と、
前記3つの発光素子を個別に駆動する複数のリードフレーム及び該複数のリードフレームと一体成形され、その表面に、前記発光素子を収容する開口を有する樹脂成形体を含むパッケージとを備え、
前記複数のリードフレームは、前記開口の底面に前記複数のリードフレームのそれぞれの一部を露出し、かつそれぞれの他の一部を外表面に露出し、
前記3つの発光素子は、前記開口の底面に露出する同一リードフレーム上において、底角が30〜60度の二等辺三角形をなすように配置されていることを特徴とする。
各図面が示す部材の大きさや位置関係等は、説明を明確にするため、誇張していることがある。
本明細書において、発光装置の光を取り出す面側から見た場合を平面視と表わす。また、発光色の異なる発光素子とは具体的にはピーク波長が5nm以上異なるものを意味する。
〔発光素子〕
発光素子は、当該分野で一般的に用いられている発光ダイオード、レーザ等の発光素子のいずれをも用いることができる。例えば、窒化物系半導体(InXAlYGa1-X-YN、0≦X、0≦Y、X+Y≦1)、GaP、GaAsなどのIII−V族化合物半導体、ZnSe、II−VI族化合物半導体等、種々の半導体によって、活性層を含む半導体層の積層構造が形成されたものが挙げられる。
また、発光素子は、いわゆるバーティカルダイス又は貼り合わせダイスなどとして公知の積層構造、例えば、特開2008−300719号公報、特開2009−10280号公報等に記載されたような積層構造を有していてもよい。
このような発光色の異なる3つの発光素子が個別に駆動し得るように載置されている場合には、各色の輝度等を個別に調整することが可能となるため、複数の発光光を組み合わせて所望の発光色を得ることができる。
具体的には、1つの発光装置に発光色の異なる3つの発光素子を載置する場合、3つの発光素子が、底角が30〜60度の二等辺三角形をなすように配置されていることが好ましい。言い換えると、底角が30〜60度の二等辺三角形を構成する3点が、3つの発光素子上に位置することが好ましい。この場合、二等辺三角形の底辺に位置する2つの発光素子間の距離は二等辺三角形の頂点に位置する発光素子の1辺の長さの1〜2倍の長さとすることが好ましい。このような配置により、発光色の異なる複数の発光素子が載置された発光装置において、それぞれの単色光、混色光の光取り出し効率を向上させることができる。
パッケージは、複数のリードフレームと、これら複数のリードフレームを一体的に成形した樹脂成形体とを含んで構成される。
パッケージの大きさ及び形状は、目的とする発光装置の大きさ及び形状、載置される発光素子の大きさ等によって適宜調整することができる。例えば、立方体、直方体、三角又は四角等の多角柱、円柱、楕円柱、略これに近似する概形で成形されているものが好ましい。なかでも、長手方向に延びる直方体に近似する形状を有するものが好ましい。
リードフレームは、後述する樹脂成形体の開口の底面に一部を露出して、発光素子の載置領域及び/又は発光素子と電気的に接続される領域としている。さらにリードフレームは、樹脂成形体の外表面に他の一部を露出してリード端子として機能させる領域としている。
樹脂成形体は、発光素子を収容して保護するとともにリードフレームと一体成形され、発光素子及びリードフレームに対して、絶縁性を確保するものである。このような機能を有するものであれば、どのような材料によって形成されていてもよい。
例えば、樹脂成形体を形成する樹脂としては、熱硬化性樹脂、熱可塑性樹脂などが挙げられる。具体的には、エポキシ樹脂組成物、シリコーン樹脂組成物、シリコーン変性エポキシ樹脂などの変性エポキシ樹脂組成物;エポキシ変性シリコーン樹脂などの変性シリコーン樹脂組成物;ポリイミド樹脂組成物、変性ポリイミド樹脂組成物;ポリフタルアミド(PPA);ポリカーボネート樹脂;ポリフェニレンサルファイド(PPS);不飽和ポリエステル、液晶ポリマー(LCP);ABS樹脂;フェノール樹脂;アクリル樹脂;PBT樹脂等の樹脂が挙げられる。
1つのリードフレームは、1つの発光素子又は2つの発光素子を載置していてもよいが、1つのリードフレーム上に3つの発光素子が載置されているものが好ましい。
リードフレームの配置にかかわらず、3つの発光素子は、平面視で底角が30〜60度の二等辺三角形をなすように配置されていることが好ましい。ここでの二等辺三角形は、発光素子の中心又は重心を結んだ直線によって描かれる形状を意味する。このような構成によって、3つの発光素子間のそれぞれの距離を近づけることができるため、混色を容易に調整することが可能となり、混色性を向上させることができる。なかでも、1つのリードフレーム上に載置された3つの発光素子が上述したような二等辺三角形をなすように配置されていることが好ましい。3つの発光素子を同一のリードフレーム上に載置することで、3つの発光素子間に位置するリードフレーム表面の反射により混色光を取り出しやすくなる。
なお、3つの発光素子の大きさが異なる場合は、二等辺三角形を構成する3点が発光素子の中心又は重心と必ずしも一致していなくてもよい。二等辺三角形を構成する3点が、発光素子の少なくとも一部と重なるように3つの発光素子が配置されていればよい。
二等辺三角形の底辺は、樹脂成形体の開口の一辺に対して平行又は略平行であることが好ましい。ここでの略とは、±5度程度の傾きを許容することを意味する。言い換えると、二等辺三角形の底辺を構成する2つの発光素子は、上述した樹脂成形体の開口の一辺からの距離が同じであることが好ましい。
このような配置により、開口内壁による反射によって、3つの発光素子からの単色光及び混色光の光取り出し効率をさらに向上させることができる。
ワイヤは、例えば、金、銀、銅、白金、アルミニウム等の金属及びそれらの合金を用いたもの、ワイヤ表面に銀又は銀合金を被覆したもの等を用いることができる。なかでも、反射率が高い材料を選択する場合には、銀、銅、鉛、アルミニウム、白金又はこれらの合金が好ましく、銀又は銀合金がより好ましい。ワイヤの直径は特に限定されるものではないが、10μm〜70μm程度が挙げられ、15μm〜50μm程度が好ましくは、18μm〜30μm程度がより好ましい。
この実施形態の発光装置10は、図1〜図4に示すように、赤色系、青色系、緑色系に対応する3つの発光素子として、第1の発光素子11b、第2の発光素子11c、第3の発光素子11aと、パッケージ13とを備えて構成される。
樹脂成形体14は、概形が略直方体であり、その一面、例えば、正面14bにおいて、発光素子を収容する開口14aを備えている。開口14aは、3.45×0.81mmの長手方向に延びる形状を有する。
第1の発光素子11bは赤色の光を発するものであり、例えば、一辺が210μmである。第2の発光素子11cは青色の光を発するものであり、例えば、一辺が230μmである。第3の発光素子11aは、緑色の光を発するものであり、例えば、一辺が230μmである。
このような配置により、3つの発光素子を近似して配置させながら、発光素子からそれぞれ出射される光が他の発光素子に吸収されることを最小限にとどめ、開口内壁による反射によって、光取り出し効率を向上させることができる。
このように、発光装置10では、底辺の長さが620μm、高さが320μmの二等辺三角形をなすように3つの発光素子が配置されている。また、第2の発光素子11cと第3の発光素子11aとは390μmの間隔をあけて配置されている。このような配置により、3つの発光素子が発する光の単色光、混色光それぞれの光取り出し効率を向上させることができる。
11a 第3の発光素子、11b 第1の発光素子、11c 第2の発光素子
12a、12b 第4のリードフレーム
12c 第2のリードフレーム
12d 第1のリードフレーム
12e、12f 第3のリードフレーム
13 パッケージ
14 樹脂成形体
14a 開口
14b 正面
14c 下面
14d 裏面
14e 側面
14f 上面
15 ワイヤ
16、17 保護素子
Claims (11)
- 発光色の異なる3つの発光素子と、
光反射材を含有し、前記3つの発光素子を個別に駆動する複数のリードフレーム及び該複数のリードフレームと一体成形され、その表面に、前記発光素子を収容し、平面視において、長手方向に延びる形状の開口を有し、該開口を有する面と隣接する下面を有する樹脂成形体を含むパッケージとを備え、
前記複数のリードフレームは、前記開口の底面に、それぞれの一部を露出し、かつそれぞれの他の一部を前記樹脂成形体の外表面に露出し、
前記3つの発光素子は、前記開口の底面に露出する同一リードフレーム上において、平面視で、底角が30〜60度の二等辺三角形をなすように配置されており、該二等辺三角形の底辺は、前記樹脂成形体の前記下面とは反対側の面側に偏って配置されており、前記二等辺三角形の底辺に位置する2つの発光素子は、他の1つの発光素子と、前記長手方向において重なることなく配置され、かつ前記3つの発光素子は、前記長手方向に直交する短手方向において重なることなく配置されていることを特徴とする側面発光型の発光装置。 - 前記二等辺三角形の底辺に位置する2つの発光素子間の距離は、前記二等辺三角形の頂点に位置する発光素子の1辺の長さの1〜2倍の長さである請求項1に記載の発光装置。
- 前記樹脂成形体が前記長手方向に延びる直方体に近似する形状である請求項1又は2に記載の発光装置。
- 前記樹脂成形体の前記開口を有する面と隣接する下面から、前記複数のリードフレームの他の一部が前記外表面に露出している請求項1〜3のいずれか1つに記載の発光装置。
- 平面視において、前記二等辺三角形の底辺が、前記開口の長手方向に平行に配置されている請求項1〜4のいずれか1つに記載の発光装置。
- 平面視において、前記外表面に露出したリードフレームの他の一部が、前記外表面に沿って屈曲している請求項1〜5のいずれか1つに記載の発光装置。
- 平面視において、前記二等辺三角形の頂点に位置する発光素子は、前記長手方向に直交する中央線上に配置されている請求項1〜6のいずれか1つに記載の発光装置。
- 前記3つの発光素子は、赤、青、緑の光を出射する発光素子である請求項1〜7のいずれか1つに記載の発光装置。
- 前記緑及び青の光を出射する発光素子に対して、保護素子がそれぞれ配置されている請求項8に記載の発光装置。
- 前記3つの発光素子は、前記リードフレームにワイヤによって接続されており、第1の発光素子と接続された第1のリードフレームが、第2の発光素子が載置された第2のリードフレームと、ワイヤで接続された第3のリードフレームとの間に配置され、かつ、前記第1のリードフレームの前記長手方向の長さが、前記複数のリードフレームにおいて最小である請求項1〜9のいずれか1つに記載の発光装置。
- 前記3つの発光素子は、それぞれ平面視が略矩形状であり、前記3つの発光素子は、その側面が前記樹脂成形体の前記開口の側面と対向するようにそれぞれ配置されている請求項1〜10のいずれか1つに記載の発光装置。
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