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JP4081394B2 - Light emitting element storage package and light emitting device - Google Patents

Light emitting element storage package and light emitting device Download PDF

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Publication number
JP4081394B2
JP4081394B2 JP2003073200A JP2003073200A JP4081394B2 JP 4081394 B2 JP4081394 B2 JP 4081394B2 JP 2003073200 A JP2003073200 A JP 2003073200A JP 2003073200 A JP2003073200 A JP 2003073200A JP 4081394 B2 JP4081394 B2 JP 4081394B2
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Prior art keywords
light emitting
emitting element
frame
recess
peripheral surface
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JP2003073200A
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JP2004281856A (en
Inventor
敏幸 千歳
陽介 森山
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Kyocera Corp
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Kyocera Corp
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    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01LSEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L2224/00Indexing scheme for arrangements for connecting or disconnecting semiconductor or solid-state bodies and methods related thereto as covered by H01L24/00
    • H01L2224/01Means for bonding being attached to, or being formed on, the surface to be connected, e.g. chip-to-package, die-attach, "first-level" interconnects; Manufacturing methods related thereto
    • H01L2224/42Wire connectors; Manufacturing methods related thereto
    • H01L2224/47Structure, shape, material or disposition of the wire connectors after the connecting process
    • H01L2224/48Structure, shape, material or disposition of the wire connectors after the connecting process of an individual wire connector
    • H01L2224/4805Shape
    • H01L2224/4809Loop shape
    • H01L2224/48091Arched
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01LSEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L2224/00Indexing scheme for arrangements for connecting or disconnecting semiconductor or solid-state bodies and methods related thereto as covered by H01L24/00
    • H01L2224/01Means for bonding being attached to, or being formed on, the surface to be connected, e.g. chip-to-package, die-attach, "first-level" interconnects; Manufacturing methods related thereto
    • H01L2224/42Wire connectors; Manufacturing methods related thereto
    • H01L2224/47Structure, shape, material or disposition of the wire connectors after the connecting process
    • H01L2224/48Structure, shape, material or disposition of the wire connectors after the connecting process of an individual wire connector
    • H01L2224/481Disposition
    • H01L2224/48151Connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive
    • H01L2224/48221Connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive the body and the item being stacked
    • H01L2224/48225Connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive the body and the item being stacked the item being non-metallic, e.g. insulating substrate with or without metallisation
    • H01L2224/48227Connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive the body and the item being stacked the item being non-metallic, e.g. insulating substrate with or without metallisation connecting the wire to a bond pad of the item

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Description

【0001】
【発明の属する技術分野】
本発明は、発光ダイオード等の発光素子を用いた表示装置等に用いられる、発光素子を収納するための発光素子収納用パッケージおよび発光装置に関する。
【0002】
【従来の技術】
従来、発光ダイオード等の発光素子を収納するための発光素子収納用パッケージ(以下、単にパッケージともいう)として、セラミック製のパッケージが用いられており、その一例を図18に示す(例えば、下記の特許文献1参照)。同図に示すように、従来のパッケージは、複数のセラミック層が積層されて成るとともに上面に凹部14が形成されている直方体状の絶縁基体の凹部14の底面に発光素子13を搭載するための導体層から成る搭載部12が設けられた基体11と、基体11の搭載部12およびその周辺から基体11の下面に形成された一対の配線層15とから主に構成されている。
【0003】
そして、一方の配線層15の一端が電気的に接続された搭載部12上に発光素子13を導電性接着剤、半田等を介して載置固定するとともに、発光素子13の電極と他方の配線導体15とをボンディングワイヤ16を介して電気的に接続し、しかる後、基体11の凹部14内に図示しない透明樹脂を充填して発光素子13を封止することによって、発光装置が作製される。
【0004】
また、凹部14の内周面で発光素子13の光を反射させてパッケージの上方に光を放射させるために、凹部14の内周面にニッケル(Ni)めっき層や金(Au)めっき層を表面に有するメタライズ層からなる金属層17を被着させていることもある。
【0005】
また、上記のパッケージはセラミックグリーンシート積層法により以下のようにして製作される。まず、基体11の搭載部12(搭載部12から下側)を形成するためのセラミックグリーンシート(以下、グリーンシートともいう)と、基体11の凹部14を形成するためのグリーンシートとを準備し、これらのグリーンシートに配線導体15を導出させるための貫通孔や凹部14となる貫通穴を打ち抜き法で形成する。
【0006】
次に、搭載部12を形成するためのグリーンシートの積層体Aの貫通孔および所定の部位に、メタライズ層から成る配線層15形成用の導体ペーストをスクリーン印刷法等で印刷塗布し、また凹部14の内周面にメタライズ層を被着する場合、凹部14を形成するためのグリーンシートの積層体Bの貫通穴内面に金属層17形成用の導体ペーストをスクリーン印刷法等で印刷塗布する。
【0007】
次に、積層体A,Bを重ねて接着して基体11を形成するための積層体とし、これを所定寸法に切断して成形体となし、高温(1600℃程度)で焼成して焼結体となす。その後、配線層15および金属層17の露出表面にニッケル,金,パラジウム,白金等の金属から成るめっき金属層を無電解めっき法や電解めっき法により被着させることによって、パッケージが製作される。
【0008】
【特許文献1】
特開2002−232017号公報
【0009】
【発明が解決しようとする課題】
しかしながら、上記従来のパッケージにおいては、スクリーン印刷法で凹部14の内周面に導体ペーストを印刷塗布して、金属層17を形成することから、導体ペーストの粘度等の影響により、凹部14の内周面に形成された金属層17の厚みや表面粗さがばらつきやすく、発光素子13が発光する光を効率よく反射し、外部に均一に放射しにくくなるという問題点を有していた。
【0010】
従って、本発明は上記従来の技術の問題点に鑑み完成されたものであり、その目的は、凹部内に収容された発光素子が発光する光を効率よく反射させて広領域の外部に均一かつ効率よく放出することができる小型の発光素子収納用パッケージおよび発光装置を提供することにある。
【0011】
【課題を解決するための手段】
本発明の発光素子収納用パッケージは、絶縁基体の上面に発光素子を収容するための凹部が設けられているとともに、該凹部の底面に前記発光素子が搭載される搭載部および前記発光素子の電極が接続される配線層が形成されている発光素子収納用パッケージであって、前記凹部の内周面に複数の枠部材を組み合わせて成る金属製の枠体が嵌着されていることを特徴とする。
【0012】
本発明の発光素子収納用パッケージは、凹部の内周面に複数の枠部材を組み合わせて成る金属製の枠体が嵌着されていることから、凹部の内周面の表面状態に影響を受けることなく発光素子が発光する光を金属製の枠体の内周面で効率よく反射させて、外部に均一かつ効率良く放射させることができる。
【0013】
また、枠体は、複数の枠部材を組み合わせて成るので、個々の枠部材を精度良く加工しやすくなり、その結果、枠体の形状やその内周面の表面状態を精度良く加工できるとともに、凹部内へ容易かつ精度よく枠体を嵌着することができる。
【0014】
本発明の発光素子収納用パッケージは、好ましくは、前記枠体は、アルミニウム,銀,金,パラジウムまたは白金のいずれかから成ることを特徴とする。
【0015】
本発明の発光素子収納用パッケージは、好ましくは枠体はアルミニウム,銀,金,パラジウムまたは白金のいずれかから成ることから、発光素子の光をさらに枠体でより良好に反射することができるので、外部により均一かつ効率よく放射させることができる。
【0016】
また本発明の発光素子収納用パッケージは、好ましくは、前記枠体は、内周面にアルミニウム,銀,金,パラジウムまたは白金のいずれかから成る金属層が被着されていることを特徴とする。
【0017】
本発明の発光素子収納用パッケージは、好ましくは枠体は内周面にアルミニウム,銀,金,パラジウムまたは白金のいずれかから成る金属層が被着されていることから、発光素子の光を枠体に被着されている金属層でより良好に反射することができるので、外部により均一かつ効率よく放射させることができる。
【0018】
本発明の発光装置は、本発明の発光素子収納用パッケージと、前記搭載部に搭載されるとともに前記配線層に電気的に接続された発光素子と、該発光素子を覆う透明樹脂とを具備していることを特徴とする。
【0019】
本発明の発光装置は、上記の構成により、発光素子の光を良好に反射し、外部に均一かつ効率良く放射することができる、発光効率の高い高性能のものとなる。
【0020】
【発明の実施の形態】
本発明の発光素子収納用パッケージを以下に詳細に説明する。図1は本発明のパッケージについて実施の形態の一例を示す断面図であり、図2は図1のパッケージの平面図である。これらの図において、1は絶縁基体、2は発光素子3の搭載部、3は発光素子、4は発光素子3を収容するための凹部である。
【0021】
本発明のパッケージは、絶縁基体1の上面に発光素子3を収容するための凹部4が設けられているとともに、凹部4の底面に発光素子3が搭載される搭載部2および発光素子3の電極が接続される配線層5a,5bが形成されているものであって、凹部4の内周面に複数の枠部材を組み合わせて成る金属製の枠体8が嵌着されている。
【0022】
金属製の枠体8は発光素子3を囲繞するように嵌着されており、図1,図2においては、枠体8は2つの枠部材8a,8bを組み合わせて成る。
【0023】
本発明における絶縁基体1は、セラミックスや樹脂から成り、セラミックスからなる場合、例えば酸化アルミニウム質焼結体(アルミナセラミックス),窒化アルミニウム質焼結体,ムライト質焼結体,ガラスセラミックス質焼結体等のセラミックスから成る絶縁層を複数層積層してなる直方体状の箱状であり、上面の中央部に発光素子3を収容するための凹部4が形成されている。絶縁基体1が例えば酸化アルミニウム質焼結体から成る場合、酸化アルミニウム,酸化珪素,酸化マグネシウム,酸化カルシウム等の原料粉末に適当な有機バインダー,溶剤等を添加混合して泥漿状となし、これを従来周知のドクターブレード法やカレンダーロール法等によりシート状に成形してグリーンシート(セラミック生シート)を得、しかる後、グリーンシートに凹部4用の貫通孔を打ち抜き加工で形成するとともに、発光素子3を搭載するためのグリーンシートと凹部4用のグリーンシートとを複数枚積層し、高温(約1600℃)で焼成し一体化することで形成される。
【0024】
また、凹部4の底面には発光素子3を搭載するための搭載部2が形成されており、搭載部2はタングステン(W),モリブデン(Mo),銅(Cu),銀(Ag)等の金属粉末のメタライズ層から成っている。
【0025】
また、絶縁基体1は、搭載部2およびその周辺から絶縁基体1の下面に形成された配線層5a,5bが被着形成されている。配線層5a,5bは、WやMo等の金属粉末のメタライズ層から成り、凹部4に収容された発光素子3を外部に電気的に接続するための導電路である。そして、搭載部2には発光ダイオード(LED),半導体レーザ(LD)等の発光素子3が金(Au)−シリコン(Si)合金やAg−エポキシ樹脂等の導電性接合材により固着されるとともに、配線層5bには発光素子3の電極がボンディングワイヤ6を介して電気的に接続されている。そして、基体1下面の配線層5a,5bが外部電気回路基板の配線導体に接続されることで発光素子3の各電極と電気的に接続され、発光素子3へ電力や駆動信号が供給される。また、発光素子3は搭載部2および配線層5bにフリップチップ実装により接続されても構わない。
【0026】
配線層5a,5bは、例えばWやMo等の金属粉末に適当な有機溶剤、溶媒を添加混合して得た金属ペーストを基体1となるグリーンシートに予めスクリーン印刷法により所定パターンに印刷塗布しておくことによって、基体1の所定位置に被着形成される。
【0027】
なお、配線層5a,5bおよび搭載部2の露出する表面に、ニッケル(Ni),金(Au),Ag等の耐蝕性に優れる金属を1〜20μm程度の厚みで被着させておくのがよく、配線層5a,5bおよび搭載部2が酸化腐蝕するのを有効に防止できるとともに、搭載部2と発光素子3との固着、配線層5bとボンディングワイヤ6との接合、および配線層5a,5bと外部電気回路基板の配線導体との接合を強固にすることができる。従って、配線層5a,5bおよび搭載部2の露出表面には、厚さ1〜10μm程度のNiめっき層と厚さ0.1〜3μm程度のAuめっき層またはAgめっき層とが、電解めっき法や無電解めっき法により順次被着されていることがより好ましい。
【0028】
そして、本発明において、凹部4の内周面に複数の枠部材を組み合わせて成る金属製の枠体8が嵌着されている。これにより、凹部4の内周面の表面状態に影響を受けることなく発光素子3が発光する光を金属製の枠体8の内周面で効率よく反射させて、外部に均一かつ効率良く放射させることができる。
【0029】
また、枠体8は、複数の枠部材を組み合わせて成るので、個々の枠部材を精度良く加工しやすくなり、その結果、枠体の形状や内周面の表面状態を精度良く加工できるとともに、凹部4内へ容易かつ精度よく枠体8を嵌着することができる。
【0030】
この金属製の枠体8は、樹脂接着剤により凹部4の内周面に嵌着されていても良いし、凹部4の内周面に接合用のメタライズ層を形成し、Agろう等によりろう付けして接合されていても良い。また、凹部4内に発光素子3を収容し、ボンディングワイヤ6等を介して電気的接続を行なった後に、凹部4内に封入する透明樹脂によって、発光素子3とともに枠体8内周面を覆って封止し、枠体8が凹部4に嵌着された状態としても良い。また、複数の枠部材同士は、樹脂接着剤やろう材により接合しても良いし、透明樹脂によって、枠体8として嵌着された状態としても良い。また、図3のパッケージの平面図に示すように、枠部材8a,8b同士の接合部に凹凸9等を形成し、嵌め合わされるようにしても良い。
【0031】
また、枠体8が嵌着される凹部4は、横断面形状が円形状、長円形状、楕円形状、四角形状等であっても良い。また、図4のパッケージの断面図に示すように、凹部4の内周面および枠体8の外周面が上側から下側にかけて広がるように形成しても良い。この場合、凹部4の内周面に凹凸があっても、枠体8は複数の枠部材8a,8bから成るので、凹部4内に複数の枠部材8a,8bを挿入していくことが容易にできる。また、凹部4内において枠部材8a,8b同士を接合して枠体8と成した際には、枠体8の外周面の下側が凹部4の内周面に引っかかることとなるので、枠体8を凹部4内に強固に嵌着することができる。また、凹部4の内周面が上側から下側にかけて広がるように形成し、枠体8の下側の外周部に突起を形成する等して、凹部4の内周面および枠体8の外周面が上側よりも下側の寸法が大きくなるようにしても良い。
【0032】
さらに、図5のパッケージの断面図に示すように、枠体8の上端部に絶縁基体1の上面に延出するように外側に折り曲げられた延出部が形成されていてもよく、この場合枠体8の凹部4への上下方向での嵌め込み位置を正確に位置決めることができる。また、枠体8の下面と凹部4の底面との間に隙間が形成されるようにすることができ、枠体8と搭載部2および配線層5a,5bとが接触して短絡等が発生するのを防ぐことができる。また、その隙間の部位の凹部4の底面に搭載部2や配線層5a,5bを形成することでそれらの形成領域を広くすることができる。さらに、その隙間に発光素子3を覆う透明樹脂が入り込むようにして凹部4内に透明樹脂を強固に接着することができる。
【0033】
また、図6のパッケージの断面図に示すように、枠体8の内周面で発光素子3の発光部よりも低い部位を絶縁基体1の上面に直交するように形成してもよく、この場合凹部4の底面の面積が増大するとともに枠体8と搭載部2および配線層5a,5bとが接触して短絡等が発生するのを防ぐことができる。
【0034】
また、凹部4の内周面の下端に、搭載部2や配線層5bの厚みよりも厚く、かつ発光素子3側に突出した段差を形成し、その段差の底面に枠体8を載置するようにしてもよい。この場合、枠体8の下面が凹部4の底面に形成された搭載部2および配線層5bよりも高い位置にあるので、枠体8と搭載部2および配線層5bとが接触して短絡するのを防止できるとともに、枠体8の下面にも凹部4の突出した段差の底面が接合するので強固に枠体8を嵌着できる。さらに、図7のパッケージの断面図に示すように、凹部4の内周面の下端の段差の幅を枠体8の下面の幅よりも小さくするとよく、枠体8の下面と凹部4の底面との間の隙間に発光素子3を覆う透明樹脂が入り込むようにして凹部4内に透明樹脂を強固に接着することができる。
【0035】
本発明のパッケージにおいては、複数の枠部材を組み合わせて成る枠体8の貫通穴の横断面形状は円形状、楕円形状、長円形状、四角形状、多角形状等の種々の形状とし得るが、円形状がよく、この場合、凹部4内に収容された発光素子3の光を枠体8の内周面で満遍なく反射させて広領域の外部に均一かつ効率よく放射することができる。
【0036】
また、図2においては、横断面形状が四角形状の凹部4の内周面に貫通穴の横断面形状が円形状の枠体8が嵌着されているが、凹部4の横断面形状と枠体8の貫通穴の横断面形状は異なっていても良い。例えば、図8のパッケージの平面図に示すように、横断面形状が四角形状の凹部4に貫通穴の横断面形状が四角形状の枠体8を嵌着しても良いし、図9のパッケージの平面図に示すように、横断面形状が円形状の凹部4に貫通穴の横断面形状が円形状の枠体8を嵌着しても良いし、図10のパッケージの平面図に示すように、横断面形状が四角形状の凹部4に貫通穴の横断面形状が8角形状の枠体8を嵌着しても良い。
【0037】
また図2においては、枠体8は凹部4の貫通穴の1つの対角線方向において分割された2つの枠部材8a,8bを組み合わせて成るが、枠部材は、加工しやすい形状や組み合わせやすい形状とするために、枠部材の形状や大きさは互いに異なっていてもよい。例えば、図11は、枠体8が2つの対角線方向において等分に分割された4つの枠部材8a〜8dを組み合わせて成るパッケージの平面図であり、図12は、枠体8が対角線方向以外の方向において等分に分割された2つの枠部材8a,8bを組み合わせて成るパッケージの平面図であり、図13は、枠体8が対角線方向以外の方向において異なる形状として分割された枠部材8a,8bを組み合わせて成るパッケージの平面図である。
【0038】
また、図14のパッケージの断面図、図15のパッケージの平面図に示すように、複数の枠部材のいずれかが、その外形寸法が凹部4の内周面の寸法よりも小さくなるように形成されていてもよい。この場合、例えば外形寸法が小さい枠部材8aを凹部4内に挿入した後に枠部材8bを入れる際に、枠部材8aを移動させて位置を調整することができ、凹部4の内周面の形状が変形していても影響を受けることなく、容易に枠部材を8a,8bを凹部4内に挿入して枠体8とすることができる。
【0039】
また、枠体8の貫通穴は下側よりも上側が大きいこと、すなわち枠体8の貫通穴の内周面が凹部4の底面から絶縁基体1の上面に向けて外側に広がるような形状であることが好ましい。この場合、発光素子3の光を外部に均一かつ良好に放射することができる。
【0040】
また、枠体8の貫通穴の内周面が、外側に凹んだ形状であったり、凹部4の底面から絶縁基体1の上面に向けて広がるとともに、貫通穴の内周面の下側よりも上側の傾斜角度(凹部4の底面に対する傾斜角度)が大きく成るような変化部を有する形状であると、光を略一定の方向に反射させる領域を広くして、発光素子3の発光する光を効率よく反射し、外部に均一かつ良好に放射することができる。
【0041】
また、枠体8の貫通穴の内周面が、内側に膨らんだ弧形状であったり、凹部4の底面から絶縁基体1の上面に向けて広がるとともに、貫通穴の内周面の下側よりも上側の傾斜角度(凹部4の底面に対する傾斜角度)が小さく成るような変化部を有する形状であると、発光素子3の光を広領域の外部に放射できるパッケージとすることができる。
【0042】
枠体8の貫通穴の内周面の傾斜角度(内周面が曲面状の場合、その下端と上端とを結ぶ直線の傾斜角度)θは35〜70°であることが好ましい。傾斜角度θが70°を超えると、凹部4内に収容された発光素子3の光を外部に対して良好に反射することが困難となる傾向にある。一方、傾斜角度θが35°未満であると、枠体8が大型化してパッケージが大型化してしまう。
【0043】
また、枠体8の貫通穴の内周面の表面の算術平均粗さRaは3μm以下が好ましい。3μmを超えると、凹部4内に収容された発光素子3の光が散乱し、反射光を高い反射率で外部に均一に放射することが困難になる。
【0044】
また、枠体8は、好ましくはアルミニウム,銀,金,パラジウムまたは白金のいずれかから成ることから、発光素子3の光を枠体8でより良好に反射することができるので、外部により均一かつ効率良く放射することができる。特に、枠体8はアルミニウムから成るのがよく、この場合、枠体8が酸化腐食されにくいとともに、発光素子3の光の波長の変動による光の反射率の変動も小さくなるので、広い用途に使用できる。
【0045】
また、枠体8として、アルミニウム(熱膨張係数約23.5×10−6/℃程度),銀(熱膨張係数約19.1×10−6/℃程度),金(熱膨張係数約14.1×10−6/℃程度),パラジウム(熱膨張係数約11.8×10−6/℃程度)または白金(熱膨張係数約8.8×10−6/℃程度)を用いる場合、絶縁基体1と枠体8との間に、熱膨張係数が絶縁基体1と枠体8との間にある金属板を介装させても良い。例えば、絶縁基体1としてアルミナセラミックス(熱膨張係数7×10−6〜8×10−6/℃程度)等から成るものを用いる場合、絶縁基体1と枠体8との熱膨張係数差により発生する熱応力を緩和するために、絶縁基体1と枠体8との間にFe−Ni−Co合金(熱膨張係数6×10−6〜10×10−6/℃程度)、Cu−W合金(熱膨張係数6×10−6〜11×10−6/℃程度)等の、より枠体8に熱膨張係数の近い金属板を用いるのがよい。これにより、絶縁基体1と枠体8との熱膨張係数差により発生する熱応力を緩和して、枠体8の剥がれ等を有効に防止することもできる。
【0046】
なお、枠体8は、アルミニウム,銀,金,パラジウムまたは白金のいずれかを主成分とする合金であっても良い。
【0047】
また、本発明における枠体8は、内周面にアルミニウム,銀,金,パラジウムまたは白金のいずれかから成る金属層が被着されていることが好ましく、発光素子3の光を枠体8に被着された金属層で良好に反射して、広領域の外部により均一かつ効率良く放射することができる。このような枠体8は、図16に示すように、枠体8の内周面にアルミニウム,銀,金,パラジウムまたは白金のいずれかから成る金属層8cを被着したものである。特に、金属層8cはアルミニウムから成るのがよく、酸化腐食やマイグレーション等の不具合が発生しにくいとともに、発光素子3の光の波長の変動による光の反射率の変動も小さくなるので、広い用途に使用できる。
【0048】
また、枠体8として、絶縁基体1に熱膨張係数の近い材質のものを使用すとよい。例えば、絶縁基体1としてアルミナセラミックス(熱膨張係数7×10−6〜8×10−6/℃程度)等から成るものを用い、枠体8として絶縁基体1に熱膨張係数の近いFe−Ni−Co合金(熱膨張係数6×10−6〜10×10−6/℃程度)等を使用すると、枠体8の剥がれ等を有効に防止することができる。このような枠体8の表面に金属層8cを被着すると、枠体8を絶縁基体1に強固に接合して嵌着することができるとともに、発光素子3の光に対する反射率を高いものとすることができる。この金属層8cは、枠体8の発光素子3側の表面(内周面)にのみ被着されていても良いし、枠体8や枠部材の全面に被着されていてもよい。また、金属層8cはアルミニウム,銀,金,パラジウムまたは白金のいずれかを主成分とする合金層であっても良い。
【0049】
また、枠体8として絶縁基体1に熱膨張係数の近い材質のものを使用するとよい。例えば、絶縁基体1としてアルミナセラミックス(熱膨張係数7×10−6〜8×10−6/℃程度)等から成るものを用い、枠体8として絶縁基体1に熱膨張係数の近いFe−Ni−Co合金(熱膨張係数6×10−6〜10×10−6/℃程度)等を使用すると、枠体8の剥がれ等を有効に防止することもできる。
【0050】
本発明の発光装置は、本発明のパッケージと、搭載部2に搭載されるとともに配線層5a,5bに電気的に接続された発光素子3と、発光素子3を覆うシリコーン樹脂等の透明樹脂とを具備している。これにより、発光素子3の光を良好に反射し、外部に均一かつ効率良く放射することができる、発光効率の高い高性能のものとなる。発光素子3を覆う透明樹脂は、発光素子3およびその周囲のみを覆っていてもよいし、凹部4内に充填されて発光素子3を覆っていてもよい。
【0051】
なお、本発明は上述の実施の形態に限定されず、本発明の要旨を逸脱しない範囲内で種々の変更を施すことは何等差し支えない。例えば、搭載部2は、絶縁基体1の上面に設けられた搭載領域であってもよい。例えば、図17のパッケージの断面図に示すように、搭載部2が絶縁基体1の上面の搭載領域である場合、発光素子3は搭載部2に樹脂接着剤等によって直接接着されるとともに、発光素子3の電極がボンディングワイヤ6a,6bを介して配線層5a,5bに電気的に接続される。
【0052】
【発明の効果】
本発明の発光素子収納用パッケージは、凹部の内周面に複数の枠部材を組み合わせて成る金属製の枠体が嵌着されていることから、凹部の内周面の表面状態に影響を受けることなく発光素子が発光する光を金属製の枠体の内周面で効率よく反射させて、外部に均一かつ効率良く放射させることができる。
【0053】
また、枠体は、複数の枠部材を組み合わせて成るので、個々の枠部材を精度良く加工しやすくなり、その結果、枠体の形状やその内周面の表面状態を精度良く加工できるとともに、凹部内へ容易かつ精度よく枠体を嵌着することができる。
【0054】
本発明の発光素子収納用パッケージは、好ましくは枠体はアルミニウム,銀,金,パラジウムまたは白金のいずれかから成ることから、発光素子の光をさらに枠体でより良好に反射することができるので、外部により均一かつ効率よく放射させることができる。
【0055】
本発明の発光素子収納用パッケージは、好ましくは枠体は内周面にアルミニウム,銀,金,パラジウムまたは白金のいずれかから成る金属層が被着されていることから、発光素子の光を枠体に被着されている金属層でより良好に反射することができるので、外部により均一かつ効率よく放射させることができる。
【0056】
本発明の発光装置は、本発明の発光素子収納用パッケージと、搭載部に搭載されるとともに配線層に電気的に接続された発光素子と、発光素子を覆う透明樹脂とを具備していることにより、発光素子の光を良好に反射し、外部に均一かつ効率良く放射することができる、発光効率の高い高性能のものとなる。
【図面の簡単な説明】
【図1】本発明の発光素子収納用パッケージの実施の形態の一例を示す断面図である。
【図2】図1の発光素子収納用パッケージの平面図である。
【図3】本発明の発光素子収納用パッケージの実施の形態の他の例を示す平面図である。
【図4】本発明の発光素子収納用パッケージの実施の形態の他の例を示す断面図である。
【図5】本発明の発光素子収納用パッケージの実施の形態の他の例を示す断面図である。
【図6】本発明の発光素子収納用パッケージの実施の形態の他の例を示す断面図である。
【図7】本発明の発光素子収納用パッケージの実施の形態の他の例を示す断面図である。
【図8】本発明の発光素子収納用パッケージの実施の形態の他の例を示す平面図である。
【図9】本発明の発光素子収納用パッケージの実施の形態の他の例を示す平面図である。
【図10】本発明の発光素子収納用パッケージの実施の形態の他の例を示す平面図である。
【図11】本発明の発光素子収納用パッケージの実施の形態の他の例を示す平面図である。
【図12】本発明の発光素子収納用パッケージの実施の形態の他の例を示す平面図である。
【図13】本発明の発光素子収納用パッケージの実施の形態の他の例を示す平面図である。
【図14】本発明の発光素子収納用パッケージの実施の形態の他の例を示す断面図である。
【図15】図14の発光素子収納用パッケージの平面図である。
【図16】本発明の発光素子収納用パッケージの実施の形態の他の例を示す断面図である。
【図17】本発明の発光素子収納用パッケージの実施の形態の他の例を示す断面図である。
【図18】従来の発光素子収納用パッケージの断面図である。
【符号の説明】
1:絶縁基体
2:搭載部
3:発光素子
4:凹部
5a,5b:配線層
8:枠体
8a〜8d:枠部材
[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a light-emitting element storage package and a light-emitting device for storing a light-emitting element, which are used in a display device using a light-emitting element such as a light-emitting diode.
[0002]
[Prior art]
Conventionally, a ceramic package has been used as a light emitting element storage package (hereinafter also simply referred to as a package) for storing light emitting elements such as light emitting diodes, and an example thereof is shown in FIG. Patent Document 1). As shown in the figure, the conventional package is for mounting the light emitting element 13 on the bottom surface of the concave portion 14 of the rectangular parallelepiped insulating base formed by laminating a plurality of ceramic layers and forming the concave portion 14 on the upper surface. The substrate 11 is mainly composed of a base 11 provided with a mounting portion 12 made of a conductor layer, and a pair of wiring layers 15 formed on the lower surface of the base 11 from the mounting portion 12 of the base 11 and its periphery.
[0003]
Then, the light emitting element 13 is placed and fixed on the mounting portion 12 to which one end of one wiring layer 15 is electrically connected via a conductive adhesive, solder, etc., and the electrode of the light emitting element 13 and the other wiring The conductor 15 is electrically connected via the bonding wire 16, and then the light emitting device 13 is sealed by filling the recess 14 of the base 11 with a transparent resin (not shown) and sealing the light emitting element 13. .
[0004]
Further, in order to reflect the light of the light emitting element 13 on the inner peripheral surface of the recess 14 and to emit light above the package, a nickel (Ni) plating layer or a gold (Au) plating layer is provided on the inner peripheral surface of the recess 14. A metal layer 17 made of a metallized layer on the surface may be deposited.
[0005]
The above package is manufactured by the ceramic green sheet lamination method as follows. First, a ceramic green sheet (hereinafter also referred to as a green sheet) for forming the mounting portion 12 (lower side from the mounting portion 12) of the base 11 and a green sheet for forming the concave portion 14 of the base 11 are prepared. A through hole for leading out the wiring conductor 15 and a through hole to be the recess 14 are formed in these green sheets by a punching method.
[0006]
Next, a conductive paste for forming the wiring layer 15 made of a metallized layer is printed and applied to the through hole and a predetermined portion of the green sheet laminate A for forming the mounting portion 12 by screen printing or the like. When the metallized layer is applied to the inner peripheral surface of 14, the conductive paste for forming the metal layer 17 is printed and applied to the inner surface of the through hole of the green sheet laminate B for forming the recess 14 by screen printing or the like.
[0007]
Next, the laminated bodies A and B are stacked and bonded to form a laminated body for forming the substrate 11, which is cut into a predetermined size to form a molded body, which is fired and sintered at a high temperature (about 1600 ° C). Body and chair. Thereafter, a package is manufactured by depositing a plated metal layer made of a metal such as nickel, gold, palladium, or platinum on the exposed surfaces of the wiring layer 15 and the metal layer 17 by an electroless plating method or an electrolytic plating method.
[0008]
[Patent Document 1]
JP 2002-232017 Gazette [0009]
[Problems to be solved by the invention]
However, in the conventional package described above, the conductor paste is printed and applied to the inner peripheral surface of the recess 14 by the screen printing method to form the metal layer 17, so that the inside of the recess 14 is affected by the influence of the viscosity of the conductor paste. The thickness and surface roughness of the metal layer 17 formed on the peripheral surface are likely to vary, and the light emitted from the light emitting element 13 is efficiently reflected, and it is difficult to uniformly radiate the outside.
[0010]
Accordingly, the present invention has been completed in view of the above-described problems of the prior art, and its purpose is to efficiently reflect the light emitted from the light emitting element accommodated in the recess so as to be uniformly and widely outside the wide area. It is an object of the present invention to provide a small light emitting element storage package and a light emitting device that can efficiently emit light.
[0011]
[Means for Solving the Problems]
In the light emitting element storage package of the present invention, a recess for receiving the light emitting element is provided on the upper surface of the insulating substrate, and a mounting portion on which the light emitting element is mounted on the bottom surface of the recess and the electrode of the light emitting element A light emitting element storage package in which a wiring layer to be connected is formed, wherein a metal frame formed by combining a plurality of frame members is fitted to the inner peripheral surface of the recess. To do.
[0012]
The light emitting element storage package of the present invention is affected by the surface state of the inner peripheral surface of the recess since the metal frame formed by combining a plurality of frame members is fitted to the inner peripheral surface of the recess. The light emitted from the light emitting element can be efficiently reflected by the inner peripheral surface of the metal frame, and can be emitted uniformly and efficiently to the outside.
[0013]
In addition, since the frame body is formed by combining a plurality of frame members, it becomes easy to process each frame member with high accuracy, and as a result, the shape of the frame body and the surface state of its inner peripheral surface can be processed with high accuracy, The frame can be easily and accurately fitted into the recess.
[0014]
In the light emitting element storage package according to the present invention, preferably, the frame body is made of any of aluminum, silver, gold, palladium, or platinum.
[0015]
In the light emitting element storage package of the present invention, the frame body is preferably made of any of aluminum, silver, gold, palladium, or platinum, so that the light of the light emitting element can be further reflected by the frame body. It is possible to radiate more uniformly and efficiently from the outside.
[0016]
In the light emitting element storage package according to the present invention, it is preferable that the frame body has a metal layer made of any one of aluminum, silver, gold, palladium, or platinum attached to an inner peripheral surface thereof. .
[0017]
In the light emitting element storage package according to the present invention, preferably, the frame body has a metal layer made of aluminum, silver, gold, palladium, or platinum deposited on the inner peripheral surface thereof. Since it can reflect more favorably with the metal layer applied to the body, it can be radiated more uniformly and efficiently to the outside.
[0018]
A light emitting device of the present invention includes the light emitting element storage package of the present invention, a light emitting element mounted on the mounting portion and electrically connected to the wiring layer, and a transparent resin covering the light emitting element. It is characterized by.
[0019]
With the above structure, the light emitting device of the present invention has a high performance with high light emission efficiency that can reflect light of the light emitting element well and radiate uniformly and efficiently to the outside.
[0020]
DETAILED DESCRIPTION OF THE INVENTION
The light emitting element storage package of the present invention will be described in detail below. FIG. 1 is a cross-sectional view showing an example of an embodiment of the package of the present invention, and FIG. 2 is a plan view of the package of FIG. In these drawings, 1 is an insulating substrate, 2 is a mounting portion for the light emitting element 3, 3 is a light emitting element, and 4 is a recess for housing the light emitting element 3.
[0021]
The package of the present invention is provided with a recess 4 for accommodating the light emitting element 3 on the upper surface of the insulating substrate 1, and a mounting portion 2 on which the light emitting element 3 is mounted on the bottom surface of the recess 4 and an electrode of the light emitting element 3. Are connected to each other, and a metal frame 8 formed by combining a plurality of frame members is fitted on the inner peripheral surface of the recess 4.
[0022]
The metal frame 8 is fitted so as to surround the light emitting element 3, and in FIGS. 1 and 2, the frame 8 is formed by combining two frame members 8a and 8b.
[0023]
The insulating substrate 1 in the present invention is made of ceramics or resin, and when made of ceramics, for example, an aluminum oxide sintered body (alumina ceramic), an aluminum nitride sintered body, a mullite sintered body, and a glass ceramic sintered body. A rectangular parallelepiped box formed by laminating a plurality of insulating layers made of ceramics or the like, and a recess 4 for accommodating the light emitting element 3 is formed at the center of the upper surface. When the insulating substrate 1 is made of, for example, an aluminum oxide sintered body, a suitable organic binder, solvent, etc. are added to and mixed with raw material powders such as aluminum oxide, silicon oxide, magnesium oxide, and calcium oxide to form a slurry. A green sheet (ceramic raw sheet) is obtained by forming into a sheet shape by a conventionally known doctor blade method or calendar roll method, and then a through hole for the recess 4 is formed in the green sheet by punching and a light emitting element 3 is formed by laminating a plurality of green sheets for mounting 3 and green sheets for the recesses 4, and baking and integrating them at a high temperature (about 1600 ° C.).
[0024]
Further, a mounting portion 2 for mounting the light emitting element 3 is formed on the bottom surface of the concave portion 4, and the mounting portion 2 is made of tungsten (W), molybdenum (Mo), copper (Cu), silver (Ag), or the like. It consists of a metallized layer of metal powder.
[0025]
In addition, the insulating base 1 is provided with wiring layers 5a and 5b formed on the lower surface of the insulating base 1 from the mounting portion 2 and its periphery. The wiring layers 5a and 5b are made of a metallized layer of a metal powder such as W or Mo, and are conductive paths for electrically connecting the light emitting element 3 accommodated in the recess 4 to the outside. A light emitting element 3 such as a light emitting diode (LED) or a semiconductor laser (LD) is fixed to the mounting portion 2 with a conductive bonding material such as gold (Au) -silicon (Si) alloy or Ag-epoxy resin. The electrodes of the light emitting element 3 are electrically connected to the wiring layer 5b through bonding wires 6. Then, the wiring layers 5 a and 5 b on the lower surface of the base 1 are connected to the wiring conductors of the external electric circuit board so as to be electrically connected to the respective electrodes of the light emitting element 3, and power and driving signals are supplied to the light emitting element 3. . The light emitting element 3 may be connected to the mounting portion 2 and the wiring layer 5b by flip chip mounting.
[0026]
For the wiring layers 5a and 5b, for example, a metal paste obtained by adding and mixing an appropriate organic solvent and solvent to a metal powder such as W or Mo is preliminarily printed and applied in a predetermined pattern on a green sheet serving as the substrate 1 by a screen printing method. By doing so, it is deposited on a predetermined position of the substrate 1.
[0027]
It should be noted that a metal having excellent corrosion resistance such as nickel (Ni), gold (Au), Ag or the like is deposited on the exposed surfaces of the wiring layers 5a and 5b and the mounting portion 2 in a thickness of about 1 to 20 μm. The wiring layers 5a and 5b and the mounting portion 2 can be effectively prevented from being oxidized and corroded, the mounting portion 2 and the light emitting element 3 are fixed, the wiring layer 5b and the bonding wire 6 are joined, and the wiring layers 5a, 5a, The bonding between 5b and the wiring conductor of the external electric circuit board can be strengthened. Therefore, on the exposed surfaces of the wiring layers 5a and 5b and the mounting portion 2, an Ni plating layer having a thickness of about 1 to 10 μm and an Au plating layer or an Ag plating layer having a thickness of about 0.1 to 3 μm are formed by an electroplating method or non-plating method. More preferably, the electrodes are sequentially deposited by electrolytic plating.
[0028]
In the present invention, a metal frame 8 formed by combining a plurality of frame members is fitted to the inner peripheral surface of the recess 4. Thereby, the light emitted from the light emitting element 3 is efficiently reflected by the inner peripheral surface of the metal frame 8 without being affected by the surface state of the inner peripheral surface of the recess 4, and is emitted uniformly and efficiently to the outside. Can be made.
[0029]
In addition, since the frame body 8 is formed by combining a plurality of frame members, it becomes easy to process each frame member with high accuracy, and as a result, the shape of the frame body and the surface state of the inner peripheral surface can be processed with high accuracy, The frame body 8 can be easily and accurately fitted into the recess 4.
[0030]
The metal frame 8 may be fitted to the inner peripheral surface of the recess 4 with a resin adhesive, or a metallized layer for bonding is formed on the inner peripheral surface of the recess 4 and soldered by Ag brazing or the like. And may be joined. Further, after accommodating the light emitting element 3 in the recess 4 and making electrical connection via the bonding wire 6 or the like, the inner peripheral surface of the frame body 8 is covered together with the light emitting element 3 by the transparent resin sealed in the recess 4. The frame body 8 may be in a state of being fitted in the recess 4. The plurality of frame members may be joined with a resin adhesive or a brazing material, or may be in a state of being fitted as the frame body 8 with a transparent resin. In addition, as shown in the plan view of the package in FIG. 3, unevenness 9 or the like may be formed at the joint between the frame members 8a and 8b and fitted together.
[0031]
In addition, the recess 4 in which the frame body 8 is fitted may have a cross-sectional shape that is circular, oval, elliptical, rectangular, or the like. Moreover, as shown in the sectional view of the package in FIG. 4, the inner peripheral surface of the recess 4 and the outer peripheral surface of the frame 8 may be formed so as to spread from the upper side to the lower side. In this case, even if the inner peripheral surface of the recess 4 is uneven, the frame body 8 is composed of a plurality of frame members 8a and 8b, so that it is easy to insert the plurality of frame members 8a and 8b into the recess 4. Can be. Further, when the frame members 8 a and 8 b are joined to each other in the recess 4 to form the frame body 8, the lower side of the outer peripheral surface of the frame body 8 is caught by the inner peripheral surface of the recess 4. 8 can be firmly fitted into the recess 4. Further, the inner peripheral surface of the concave portion 4 is formed so as to spread from the upper side to the lower side, and a protrusion is formed on the outer peripheral portion on the lower side of the frame body 8. The surface may have a lower dimension than the upper dimension.
[0032]
Furthermore, as shown in the cross-sectional view of the package in FIG. 5, an extension portion bent outward may be formed at the upper end portion of the frame 8 so as to extend to the upper surface of the insulating base 1. It is possible to accurately position the fitting position in the vertical direction of the frame body 8 into the recess 4. Further, a gap can be formed between the lower surface of the frame body 8 and the bottom surface of the recess 4, and the frame body 8, the mounting portion 2 and the wiring layers 5a and 5b come into contact with each other to cause a short circuit or the like. Can be prevented. Further, by forming the mounting portion 2 and the wiring layers 5a and 5b on the bottom surface of the concave portion 4 at the gap portion, the formation region can be widened. Further, the transparent resin can be firmly bonded in the recess 4 so that the transparent resin covering the light emitting element 3 enters the gap.
[0033]
Further, as shown in the cross-sectional view of the package in FIG. 6, a portion lower than the light emitting portion of the light emitting element 3 on the inner peripheral surface of the frame 8 may be formed so as to be orthogonal to the upper surface of the insulating substrate 1. In this case, the area of the bottom surface of the concave portion 4 is increased, and it is possible to prevent the frame body 8, the mounting portion 2, and the wiring layers 5a and 5b from coming into contact with each other and causing a short circuit or the like.
[0034]
Further, a step that is thicker than the mounting portion 2 and the wiring layer 5 b and protrudes toward the light emitting element 3 is formed at the lower end of the inner peripheral surface of the recess 4, and the frame body 8 is placed on the bottom surface of the step. You may do it. In this case, since the lower surface of the frame body 8 is higher than the mounting portion 2 and the wiring layer 5b formed on the bottom surface of the recess 4, the frame body 8, the mounting portion 2 and the wiring layer 5b come into contact with each other and short-circuit. In addition, the bottom surface of the stepped portion of the recessed portion 4 is joined to the lower surface of the frame body 8, so that the frame body 8 can be firmly fitted. Further, as shown in the sectional view of the package of FIG. 7, the width of the step at the lower end of the inner peripheral surface of the recess 4 may be made smaller than the width of the lower surface of the frame 8. The transparent resin can be firmly bonded in the recess 4 so that the transparent resin that covers the light emitting element 3 enters the gap between the recess 4 and the light emitting element 3.
[0035]
In the package of the present invention, the cross-sectional shape of the through hole of the frame body 8 formed by combining a plurality of frame members can be various shapes such as a circular shape, an elliptical shape, an oval shape, a rectangular shape, a polygonal shape, The circular shape is good, and in this case, the light of the light emitting element 3 accommodated in the concave portion 4 can be uniformly reflected by the inner peripheral surface of the frame 8 and can be radiated uniformly and efficiently to the outside of the wide area.
[0036]
In FIG. 2, a frame 8 having a circular cross-sectional shape of the through-hole is fitted to the inner peripheral surface of the concave portion 4 having a quadrangular cross-sectional shape. The cross-sectional shape of the through hole of the body 8 may be different. For example, as shown in the plan view of the package of FIG. 8, a frame body 8 having a rectangular cross-sectional shape of the through hole may be fitted into the concave portion 4 having a square cross-sectional shape, or the package of FIG. As shown in the plan view of FIG. 10, a frame 8 having a circular cross-sectional shape of the through hole may be fitted into the recess 4 having a circular cross-sectional shape, or as shown in the plan view of the package of FIG. In addition, a frame 8 having an octagonal cross-sectional shape of the through hole may be fitted into the recess 4 having a quadrangular cross-sectional shape.
[0037]
In FIG. 2, the frame 8 is formed by combining two frame members 8 a and 8 b divided in one diagonal direction of the through hole of the recess 4, but the frame member has a shape that is easy to process or a shape that is easy to combine. Therefore, the shape and size of the frame member may be different from each other. For example, FIG. 11 is a plan view of a package formed by combining four frame members 8a to 8d in which the frame body 8 is equally divided in two diagonal directions, and FIG. 12 is a plan view of the frame body 8 other than in the diagonal direction. FIG. 13 is a plan view of a package formed by combining two frame members 8a and 8b that are equally divided in the direction of. FIG. 13 shows a frame member 8a in which the frame body 8 is divided into different shapes in directions other than the diagonal direction. , 8b are package top views.
[0038]
Further, as shown in the cross-sectional view of the package in FIG. 14 and the plan view of the package in FIG. 15, any of the plurality of frame members is formed such that the outer dimension is smaller than the inner peripheral surface of the recess 4. May be. In this case, for example, when the frame member 8b is inserted after the frame member 8a having a small outer dimension is inserted into the recess 4, the position can be adjusted by moving the frame member 8a, and the shape of the inner peripheral surface of the recess 4 can be adjusted. Even if the frame is deformed, the frame member 8 can be easily inserted into the recess 4 to form the frame body 8 without being affected.
[0039]
In addition, the upper side of the through hole of the frame body 8 is larger than the lower side, that is, the inner peripheral surface of the through hole of the frame body 8 extends outward from the bottom surface of the recess 4 toward the upper surface of the insulating base 1. Preferably there is. In this case, the light of the light emitting element 3 can be emitted uniformly and satisfactorily to the outside.
[0040]
Further, the inner peripheral surface of the through hole of the frame 8 has a shape recessed outward, spreads from the bottom surface of the concave portion 4 toward the upper surface of the insulating base 1, and is lower than the lower side of the inner peripheral surface of the through hole. If the shape has a change part that increases the upper inclination angle (inclination angle with respect to the bottom surface of the recess 4), the region that reflects the light in a substantially constant direction is widened so that the light emitted from the light emitting element 3 can be emitted. Reflects efficiently and can radiate uniformly and satisfactorily to the outside.
[0041]
Further, the inner peripheral surface of the through hole of the frame body 8 has an arc shape that swells inward, spreads from the bottom surface of the recess 4 toward the upper surface of the insulating base 1, and from the lower side of the inner peripheral surface of the through hole. Further, when the shape has a change portion that reduces the upper inclination angle (inclination angle with respect to the bottom surface of the recess 4), a package capable of emitting light from the light emitting element 3 to the outside of the wide area can be obtained.
[0042]
The inclination angle θ of the inner peripheral surface of the through hole of the frame 8 (when the inner peripheral surface is curved, the inclination angle of a straight line connecting the lower end and the upper end) θ is preferably 35 to 70 °. If the inclination angle θ exceeds 70 °, it tends to be difficult to favorably reflect the light of the light emitting element 3 accommodated in the recess 4 to the outside. On the other hand, when the inclination angle θ is less than 35 °, the frame 8 is enlarged and the package is enlarged.
[0043]
Further, the arithmetic average roughness Ra of the inner peripheral surface of the through hole of the frame 8 is preferably 3 μm or less. If it exceeds 3 μm, the light of the light emitting element 3 accommodated in the recess 4 is scattered, and it becomes difficult to uniformly radiate the reflected light to the outside with a high reflectance.
[0044]
Further, since the frame 8 is preferably made of any of aluminum, silver, gold, palladium, or platinum, the light of the light-emitting element 3 can be more favorably reflected by the frame 8, so that the frame 8 is more uniform and more external. It can radiate efficiently. In particular, the frame body 8 is preferably made of aluminum. In this case, the frame body 8 is not easily oxidized and corroded, and the variation in the light reflectance due to the variation in the light wavelength of the light emitting element 3 is reduced. Can be used.
[0045]
The frame 8 is made of aluminum (coefficient of thermal expansion of about 23.5 × 10 −6 / ° C.), silver (coefficient of thermal expansion of about 19.1 × 10 −6 / ° C.), gold (coefficient of thermal expansion of about 14.1 × 10 −6). / C), palladium (thermal expansion coefficient of about 11.8 × 10 −6 / ° C.) or platinum (thermal expansion coefficient of about 8.8 × 10 −6 / ° C.), between the insulating substrate 1 and the frame 8 In addition, a metal plate having a thermal expansion coefficient between the insulating base 1 and the frame body 8 may be interposed. For example, when an insulating substrate 1 made of alumina ceramics (thermal expansion coefficient: 7 × 10 −6 to 8 × 10 −6 / ° C.) or the like is used, it is generated due to a difference in thermal expansion coefficient between the insulating substrate 1 and the frame 8. In order to relieve the thermal stress, an Fe—Ni—Co alloy (thermal expansion coefficient of about 6 × 10 −6 to 10 × 10 −6 / ° C.), Cu—W alloy is provided between the insulating substrate 1 and the frame 8. It is preferable to use a metal plate having a thermal expansion coefficient closer to the frame body 8 such as (a thermal expansion coefficient of 6 × 10 −6 to 11 × 10 −6 / ° C.). Thereby, the thermal stress generated by the difference in thermal expansion coefficient between the insulating base 1 and the frame body 8 can be relaxed, and peeling of the frame body 8 can be effectively prevented.
[0046]
The frame body 8 may be an alloy mainly composed of aluminum, silver, gold, palladium, or platinum.
[0047]
In the frame body 8 of the present invention, it is preferable that a metal layer made of any of aluminum, silver, gold, palladium, or platinum is deposited on the inner peripheral surface, and the light of the light emitting element 3 is applied to the frame body 8. It reflects well on the deposited metal layer and can radiate more uniformly and efficiently outside the wide area. As shown in FIG. 16, such a frame 8 is obtained by depositing a metal layer 8 c made of any of aluminum, silver, gold, palladium, or platinum on the inner peripheral surface of the frame 8. In particular, the metal layer 8c is preferably made of aluminum, is less susceptible to problems such as oxidative corrosion and migration, and the variation in light reflectance due to variation in the light wavelength of the light-emitting element 3 is reduced. Can be used.
[0048]
The frame 8 may be made of a material having a thermal expansion coefficient close to that of the insulating base 1. For example, the insulating substrate 1 is made of alumina ceramic (thermal expansion coefficient: 7 × 10 −6 to 8 × 10 −6 / ° C.) or the like, and the frame 8 is Fe—Ni having a thermal expansion coefficient close to that of the insulating substrate 1. When a -Co alloy (coefficient of thermal expansion 6 × 10 −6 to 10 × 10 −6 / ° C.) or the like is used, peeling of the frame body 8 can be effectively prevented. When the metal layer 8c is deposited on the surface of such a frame body 8, the frame body 8 can be firmly bonded and fitted to the insulating substrate 1, and the light reflectance of the light emitting element 3 is high. can do. The metal layer 8c may be attached only to the surface (inner peripheral surface) of the frame 8 on the light emitting element 3 side, or may be attached to the entire surface of the frame 8 or the frame member. Further, the metal layer 8c may be an alloy layer mainly composed of any one of aluminum, silver, gold, palladium, and platinum.
[0049]
The frame 8 may be made of a material having a thermal expansion coefficient close to that of the insulating base 1. For example, the insulating substrate 1 is made of alumina ceramic (thermal expansion coefficient: 7 × 10 −6 to 8 × 10 −6 / ° C.) or the like, and the frame 8 is Fe—Ni having a thermal expansion coefficient close to that of the insulating substrate 1. If a -Co alloy (coefficient of thermal expansion 6 × 10 −6 to 10 × 10 −6 / ° C.) or the like is used, peeling of the frame body 8 can be effectively prevented.
[0050]
The light emitting device of the present invention includes a package of the present invention, a light emitting element 3 mounted on the mounting portion 2 and electrically connected to the wiring layers 5a and 5b, and a transparent resin such as a silicone resin covering the light emitting element 3. It has. As a result, the light emitted from the light emitting element 3 can be reflected well and emitted uniformly and efficiently to the outside. The transparent resin that covers the light emitting element 3 may cover only the light emitting element 3 and its periphery, or may fill the recess 4 to cover the light emitting element 3.
[0051]
It should be noted that the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the scope of the present invention. For example, the mounting portion 2 may be a mounting region provided on the upper surface of the insulating base 1. For example, as shown in the cross-sectional view of the package in FIG. 17, when the mounting portion 2 is a mounting region on the upper surface of the insulating substrate 1, the light emitting element 3 is directly bonded to the mounting portion 2 with a resin adhesive or the like and emits light. The electrodes of the element 3 are electrically connected to the wiring layers 5a and 5b through bonding wires 6a and 6b.
[0052]
【The invention's effect】
The light emitting element storage package of the present invention is affected by the surface state of the inner peripheral surface of the recess since the metal frame formed by combining a plurality of frame members is fitted to the inner peripheral surface of the recess. The light emitted from the light emitting element can be efficiently reflected by the inner peripheral surface of the metal frame, and can be emitted uniformly and efficiently to the outside.
[0053]
In addition, since the frame body is formed by combining a plurality of frame members, it becomes easy to process each frame member with high accuracy, and as a result, the shape of the frame body and the surface state of its inner peripheral surface can be processed with high accuracy, The frame can be easily and accurately fitted into the recess.
[0054]
In the light emitting element storage package of the present invention, the frame body is preferably made of any of aluminum, silver, gold, palladium, or platinum, so that the light of the light emitting element can be further reflected by the frame body. It is possible to radiate more uniformly and efficiently from the outside.
[0055]
In the light emitting element storage package according to the present invention, preferably, the frame body has a metal layer made of aluminum, silver, gold, palladium, or platinum deposited on the inner peripheral surface thereof. Since it can reflect more favorably with the metal layer applied to the body, it can be radiated more uniformly and efficiently to the outside.
[0056]
The light emitting device of the present invention includes the light emitting element storage package of the present invention, a light emitting element mounted on the mounting portion and electrically connected to the wiring layer, and a transparent resin covering the light emitting element. As a result, the light from the light-emitting element can be reflected well, and the light can be emitted uniformly and efficiently to the outside.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing an example of an embodiment of a light emitting element storage package according to the present invention.
2 is a plan view of the light emitting element storage package of FIG. 1; FIG.
FIG. 3 is a plan view showing another example of the embodiment of the light emitting element storage package of the present invention.
FIG. 4 is a cross-sectional view showing another example of the embodiment of the light emitting element storage package of the present invention.
FIG. 5 is a cross-sectional view showing another example of the embodiment of the light emitting element storage package of the present invention.
FIG. 6 is a cross-sectional view showing another example of the embodiment of the light emitting element storage package of the present invention.
FIG. 7 is a cross-sectional view showing another example of the embodiment of the light emitting element storage package of the present invention.
FIG. 8 is a plan view showing another example of the embodiment of the light emitting element storage package of the present invention.
FIG. 9 is a plan view showing another example of the embodiment of the light emitting element storage package of the present invention.
FIG. 10 is a plan view showing another example of the embodiment of the light emitting element storage package of the present invention.
FIG. 11 is a plan view showing another example of the embodiment of the light emitting element storage package of the present invention.
12 is a plan view showing another example of the embodiment of the light emitting element storage package of the present invention. FIG.
FIG. 13 is a plan view showing another example of the embodiment of the light emitting element storage package of the present invention.
FIG. 14 is a cross-sectional view showing another example of the embodiment of the light emitting element storage package of the present invention.
15 is a plan view of the light emitting element storage package of FIG. 14;
FIG. 16 is a cross-sectional view showing another example of the embodiment of the light emitting element storage package of the present invention.
FIG. 17 is a cross-sectional view showing another example of the embodiment of the light emitting element storage package of the present invention.
FIG. 18 is a cross-sectional view of a conventional light emitting element storage package.
[Explanation of symbols]
1: Insulating substrate 2: Mounting portion 3: Light emitting element 4: Recesses 5a, 5b: Wiring layer 8: Frame bodies 8a to 8d: Frame member

Claims (4)

絶縁基体の上面に発光素子を収容するための凹部が設けられているとともに、該凹部の底面に前記発光素子が搭載される搭載部および前記発光素子の電極が接続される配線層が形成されている発光素子収納用パッケージであって、前記凹部の内周面に複数の枠部材を組み合わせて成る金属製の枠体が嵌着されていることを特徴とする発光素子収納用パッケージ。A recess for accommodating the light emitting element is provided on the upper surface of the insulating substrate, and a mounting portion on which the light emitting element is mounted and a wiring layer to which the electrode of the light emitting element is connected are formed on the bottom surface of the recess. A light emitting element storing package, wherein a metal frame formed by combining a plurality of frame members is fitted to the inner peripheral surface of the recess. 前記枠体は、アルミニウム,銀,金,パラジウムまたは白金のいずれかから成ることを特徴とする請求項1記載の発光素子収納用パッケージ。2. The light emitting element storage package according to claim 1, wherein the frame body is made of any of aluminum, silver, gold, palladium, or platinum. 前記枠体は、内周面にアルミニウム,銀,金,パラジウムまたは白金のいずれかから成る金属層が被着されていることを特徴とする請求項1記載の発光素子収納用パッケージ2. The light emitting element storage package according to claim 1, wherein a metal layer made of any one of aluminum, silver, gold, palladium, and platinum is attached to the inner peripheral surface of the frame. 請求項1乃至請求項3のいずれかに記載の発光素子収納用パッケージと、前記搭載部に搭載されるとともに前記配線層に電極が電気的に接続された発光素子と、該発光素子を覆う透明樹脂とを具備していることを特徴とする発光装置。The light emitting element storage package according to any one of claims 1 to 3, a light emitting element mounted on the mounting portion and having an electrode electrically connected to the wiring layer, and a transparent covering the light emitting element A light-emitting device comprising a resin.
JP2003073200A 2003-03-18 2003-03-18 Light emitting element storage package and light emitting device Expired - Fee Related JP4081394B2 (en)

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JP4938255B2 (en) * 2005-06-29 2012-05-23 京セラ株式会社 Light emitting element storage package, light source, and light emitting device
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