JP3636079B2 - Package molded body and light emitting device - Google Patents

Package molded body and light emitting device Download PDF

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Publication number
JP3636079B2
JP3636079B2 JP2001018509A JP2001018509A JP3636079B2 JP 3636079 B2 JP3636079 B2 JP 3636079B2 JP 2001018509 A JP2001018509 A JP 2001018509A JP 2001018509 A JP2001018509 A JP 2001018509A JP 3636079 B2 JP3636079 B2 JP 3636079B2
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resin
light emitting
lead electrode
molded body
positive
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JP2002223004A (en
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育也 新居
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Nichia Corp
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Nichia Corp
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L2224/00—Indexing scheme for arrangements for connecting or disconnecting semiconductor or solid-state bodies and methods related thereto as covered by H01L24/00
    • H01L2224/01—Means 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
    • H01L2224/26—Layer connectors, e.g. plate connectors, solder or adhesive layers; Manufacturing methods related thereto
    • H01L2224/31—Structure, shape, material or disposition of the layer connectors after the connecting process
    • H01L2224/32—Structure, shape, material or disposition of the layer connectors after the connecting process of an individual layer connector
    • H01L2224/321—Disposition
    • H01L2224/32151—Disposition the layer connector connecting 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
    • H01L2224/32221—Disposition the layer connector connecting 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
    • H01L2224/32245—Disposition the layer connector connecting 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 metallic
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L2224/00—Indexing scheme for arrangements for connecting or disconnecting semiconductor or solid-state bodies and methods related thereto as covered by H01L24/00
    • H01L2224/01—Means 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
    • H01L2224/42—Wire connectors; Manufacturing methods related thereto
    • H01L2224/47—Structure, shape, material or disposition of the wire connectors after the connecting process
    • H01L2224/48—Structure, shape, material or disposition of the wire connectors after the connecting process of an individual wire connector
    • H01L2224/484—Connecting portions
    • H01L2224/48463—Connecting portions the connecting portion on the bonding area of the semiconductor or solid-state body being a ball bond
    • H01L2224/48465—Connecting portions the connecting portion on the bonding area of the semiconductor or solid-state body being a ball bond the other connecting portion not on the bonding area being a wedge bond, i.e. ball-to-wedge, regular stitch
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L2224/00—Indexing scheme for arrangements for connecting or disconnecting semiconductor or solid-state bodies and methods related thereto as covered by H01L24/00
    • H01L2224/01—Means 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
    • H01L2224/42—Wire connectors; Manufacturing methods related thereto
    • H01L2224/47—Structure, shape, material or disposition of the wire connectors after the connecting process
    • H01L2224/49—Structure, shape, material or disposition of the wire connectors after the connecting process of a plurality of wire connectors
    • H01L2224/491—Disposition
    • H01L2224/49105—Connecting at different heights
    • H01L2224/49107—Connecting at different heights on the semiconductor or solid-state body
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L2224/00—Indexing scheme for arrangements for connecting or disconnecting semiconductor or solid-state bodies and methods related thereto as covered by H01L24/00
    • H01L2224/73—Means for bonding being of different types provided for in two or more of groups H01L2224/10, H01L2224/18, H01L2224/26, H01L2224/34, H01L2224/42, H01L2224/50, H01L2224/63, H01L2224/71
    • H01L2224/732—Location after the connecting process
    • H01L2224/73251—Location after the connecting process on different surfaces
    • H01L2224/73265—Layer and wire connectors

Description

【０００１】
【発明の属する技術分野】
本発明は、発光装置用のパッケージ成形体とそのパッケージ成形体を用いた発光装置に関する。
【０００２】
【従来の技術】
近年、小型・薄型化を目的として、表面実装タイプの発光装置がリードタイプの発光装置に代えて多く使用されるようになって来ている。
この面実装タイプの発光装置は、パッケージ成形体の凹部に発光素子チップが設けられ、その発光素子チップを覆うように透光性樹脂を充填することにより構成される。ここで、パッケージ成形体は、正及び負のリード電極が凹部の底面に露出されるように成形樹脂で一体成形されている。
【０００３】
【発明が解決しようとする課題】
しかしながら、今後面実装タイプの発光装置がより広く使用されるようになると、より厳しい環境条件に耐え得る発光装置が望まれるが、厳しい環境条件における使用を考えると、従来の面実装タイプの発光装置は、凹部に充填された透光性樹脂とパッケージ成形体との密着力が十分でないという問題点があった。
【０００４】
そこで、本発明は、凹部に充填された透光性樹脂との密着力をより強くできるパッケージ成形体と、凹部に充填された透光性樹脂とパッケージ成形体との密着力をより強くでき、より信頼性の高い面実装タイプの発光装置を提供することを目的とする。
【０００５】
【課題を解決するための手段】
以上の目的を達成するために、本発明に係る発光装置用のパッケージ成形体は、発光素子チップを収納する凹部と正と負のリード電極とを有し、上記凹部の底面において上記正のリード電極と上記負のリード電極とが所定の間隔を隔てて露出するように上記正のリード電極及び上記負のリード電極が成形樹脂の注入により一体成形されてなるパッケージ成形体において、上記正のリード電極又は負のリード電極は、上記凹部の縦軸に対して左右対称の位置に切り込み又は開口部を有すると共に、上記成形樹脂の注入側と反対の主面と端面とが交わる端部にバリが形成されており、上記凹部の底面に、上記正のリード電極と上記負のリード電極の間の他に、上記成形樹脂が露出されてなる少なくとも一対の樹脂露出部が、上記凹部の縦軸に対して左右対称に設けられたことを特徴とする
このように構成されたパッケージ成形体は、発光素子チップを上記凹部に設け、透光性樹脂を上記凹部に充填した時に、凹部の底面において縦軸に対して左右対称に設けられた上記一対の樹脂露出部の樹脂と透光性樹脂とを接合できるので、上記樹脂露出部を設けない場合及び樹脂露出部を左右対称に設けていない場合に比較して、該透光性樹脂とパッケージ成形体との接合強度を強くできる。
これにより、本発明に係る発光装置用のパッケージ成形体は、例えば、気化膨張等に起因する上記透光性樹脂と上記パッケージ成形体との界面の剥離を効果的に防止することができる。
また、本発明に係る発光装置用のパッケージ成形体では、樹脂露出部が、上記凹部の縦軸に対して左右対称に設けられているので発光装置の指向特性を左右対称にできる。
また、この樹脂露出部は正又は負の電極リードに切り込み等を形成してその切り込み等の内部に成形樹脂が充填されているので、正又は負の電極リードと成形樹脂とを強固に固定でき、正又は負の電極リードと成形樹脂との剥離も防止できる。
これにより、本発明に係る発光装置用のパッケージ成形体によれば、指向特性を左右対称にでき、かつ従来例に比較してより厳しい使用環境にも耐えることができる信頼性の高い発光装置を構成できる。
【０００６】
また、本発明に係る発光装置用のパッケージ成形体においては、パッケージ成形体における正及び負の電極リードと成形樹脂とをより強固に固定しかつ透光性樹脂とパッケージ成形体との接合強度をよりいっそう強くするために、上記樹脂露出部は、上記正のリード電極側と上記負のリード電極側とにそれぞれ少なくとも１対設けられることが好ましい。
【０００７】
また、本発明に係る発光装置は、本発明に係る発光装置用のパッケージ成形体と、該パッケージ成形体の上記凹部に設けられた発光素子チップとを備え、該発光素子チップが上記凹部内で透光性樹脂によってモールドされてなる。
このように構成された本発明に係る発光装置は、上記凹部の底面の樹脂露出部の樹脂と透光性樹脂とを接合できるので、該透光性樹脂とパッケージ成形体との接合強度をより強くできる。
これにより、本発明に係る発光装置は、従来例に比較して、より厳しい使用環境にも耐えることができ、信頼性をより高くできる。
【０００８】
【発明の実施の形態】
以下、本発明に係る実施の形態の発光装置について説明する。
本発明に係る実施の形態の発光装置は、以下のように構成される。
本実施の形態の発光装置において、パッケージ成形体１は、例えば図１（ａ）に示すように、正のリード電極２１と負のリード電極２２とが成形樹脂１０によって一体成形されて作製される。
詳細に説明すると、パッケージ成形体１の上面には、発光素子チップ３０を収納する凹部１４が形成され、その凹部１４の底面には、正のリード電極２１と負のリード電極２２とが互いに分離されてそれぞれの一方の主面が露出するように設けられる。
尚、本明細書において、パッケージ成形体１の上面とは、発光素子チップが載置される側の面をいい、下面とは実装基板に対向する面のことをいう。
【０００９】
また、正のリード電極２１の一端と負のリード電極２２の一端とは凹部１４の底部において互いに対向するように設けられ、正のリード電極２１の一端と負のリード電極２２の一端との間には成形樹脂が充填され、凹部１４の底面が形成される。
また、パッケージ成形体１において、正のリード電極２１の他端と負のリード電極２２の他端とは、パッケージ成形体１の端面から突き出すように設けられ、その突き出した部分が図１（ｂ）に示すようにパッケージ成形体１の下面である接合面の内側に折り曲げられて正負の接続端子部が構成される。
【００１０】
ここで、特に本実施の形態の発光装置では、パッケージ成形体１の接合面において、折り曲げられた正のリード電極２１の他端に沿って第１凸部１１が成形樹脂１０と一体で形成され、折り曲げられた負の電極リード２２の他端に沿って第２凸部１２が成形樹脂１０と一体で形成されたことを特徴とし、これにより実施の形態の発光装置を基板上に実装する際のはんだ付け不良を低減している。
また、本実施の形態の発光装置において、第１凸部１１と第２凸部１２は互いに同一形状でかつ断面形状が方形又は台形になるように形成することが好ましい。
さらに、正負の電極リードの実装基板に対向する外表面と第１凸部１１及び第２凸部１２の実装基板の外表面とは、それぞれが実装基板と接触するように、実質的に同一平面上に位置するように構成されることが好ましい。
以上のように構成されたパッケージ成形体１の凹部１４に、発光素子チップが設けられれ、凹部１４内に発光素子チップを覆うように透光性樹脂が充填されて実施の形態の発光装置は構成される。
【００１１】
次に、本実施の形態の発光装置の製造方法について説明する。
（ステップ１）
本製造方法において、ステップ１ではまず、例えば、０．１５ｍｍ厚の鉄入り銅からなる長尺金属板をプレスを用いた打ち抜き加工により各パッケージ成形体の正負のリード電極となる複数の部分を形成する。
ここで、本実施の形態において、プレスの打ち抜き方向（ダイに対してポンチを移動させる方向）は、後述の射出成形において、成形樹脂を流す方向と一致させる。
【００１２】
プレス加工後の長尺金属板の各パッケージ成形体に対応する部分において、正のリード電極２１は、成形後の凹部１４の底面においてその一端面が負のリード電極２２の一端面と対向するように負のリード電極２２とは分離されている。
また、正のリード電極２１には、成形樹脂との結合強度を強くするために、正のリード電極２１の一端面に垂直な中心線を軸とする開口部が形成され、負のリード電極２２には、成形樹脂との結合強度を強くするために、負のリード電極２２の一端面に垂直な中心線を軸とする開口部が形成されている。
この開口部はパッケージ成形体の端部の内側と外側に跨って位置するように設けられ、正と負のリード電極２１，２２と成形樹脂との結合強度を強くするとともに、パッケージ成形体１の端面から突き出した正のリード電極２１と負のリード電極２２とを、パッケージ樹脂に大きな力がかからないように端子構造がＪ−ベンド（Ｂｅｎｄ）構造になるように曲げることができる。
さらに、正のリード電極２１にはその一端面に垂直な中心線に対して左右対称の位置に２つの切り込み又は開口部が形成され、負のリード電極２２にはその一端面に垂直な中心線に対して左右対称の位置に２つの切り込み又は開口部が形成されている。
この正の電極リード及び負の電極リードにおいて左右対称の位置に形成された切り込み又は開口部は、射出成形後にそれぞれ切り込みの先端部分又は開口部が凹部１４の底面に位置するような深さ又は位置に形成される。
ここで、本実施の形態では、正のリード電極２１の一端面に垂直な中心線と負のリード電極２２の一端面に垂直な中心線は互いに一致させ、その中心線が凹部１４の縦軸（本明細書において、凹部１４の直交する２つの軸のうちの上記中心軸と一致させる一方の軸を便宜上、縦軸と称し、他方の軸を横軸と称する。）と一致するように樹脂成形される。
【００１３】
（ステップ２）
ステップ２では、ステップ１で打ち抜き加工した長尺金属板を、Ａｇメッキを施した後、成形金型内にセットして、射出成形により各パッケージ成形体に対応する部分にそれぞれ成形樹脂部１０を形成する。
【００１４】
本実施の形態において、成形樹脂部１０を成形するための成形金型は、
（１）成形樹脂部１０において、ゲートの両側の接合面に峰状の第１凸部１１と第２凸部１２が形成されるように、
（２）成形樹脂部１０において、接合面と反対側の面に、発光素子チップを収納するための凹部１４がパッケージ成形体の縦軸に対して対称に形成されるように、
（３）凹部１４の底面に、互いに分離された正のリード電極２１と負のリード電極２２が露出し、かつ正のリード電極２１と負のリード電極２２の間に成形樹脂が充填されるように、
（４）凹部１４の底面に位置する正のリード電極２１において、凹部１４の縦軸に対して対称に２つの樹脂露出部２１ａが形成され、凹部１４の底面に位置する負のリード電極２２において、凹部１４の縦軸に対して対称に２つの樹脂露出部２２ａが形成されるように、作製される。
【００１５】
また、本実施の形態において、成形金型のゲートは、樹脂がパッケージ成形体１の接合面側から注入されるように接合面における第１凸部１１と第２凸部１２の間の位置に設けられ、成形金型において、プレス加工された長尺金属板は、プレスの打ち抜き方向と成形金型内に樹脂を注入する方向とが一致するように設けられる。
このように、本実施の形態では、パッケージ成形体１を作製する時に、プレスの打ち抜き方向と樹脂を注入する方向を一致させることにより、正及び負のリード電極２１，２２の一端面２１ｅｆ，２２ｅｆにより形成される空間に隙間なく充填することができ、注入される成形樹脂の一方の主面２１ｆ１，２２ｆ１上への流出を阻止することができる。
【００１６】
すなわち、プレス打ち抜き加工において、受側の金型であるダイを正及び負のリード電極２１，２２の一方の表面２１ｆ１，２２ｆ１に接するように長尺金属板２０１をセットし、ポンチを正及び負のリード電極２１，２２の他方の表面２１ｆ２，２２ｆ２側から移動させて打ち抜いているので、正と負のリード電極２１，２２はそれぞれ、他方の主面２１ｆ２，２２ｆ２と一端面２１ｅｆ，２２ｅｆとの交わる端部２１ｅ，２２ｅの内角θが鈍角になる（図４（ａ））。
これにより、図４（ａ）において矢印で示す方向から注入される成形樹脂は、端部２１ｅ，２２ｅにおいて流れが阻害されることがないので、底面１４ｆに対応して形成された成形金型の面と正及び負のリード電極２１，２２の一端面２１ｅｆ，２２ｅｆにより形成される空洞に隙間なく充填することができる。
また、プレス打ち抜き加工において、上述のようにポンチを正及び負のリード電極２１，２２の他方の表面２１ｆ２，２２ｆ２側から移動させて打ち抜いているので、正と負のリード電極２１，２２はそれぞれ、一方の主面２１ｆ１，２２ｆ１と一端面２１ｅｆ，２２ｅｆとの交わる端部にバリ２１ｈ，２２ｈが形成される（図４（ａ））。
このように、一方の主面２１ｆ１，２２ｆ１と一端面２１ｅｆ，２２ｅｆとの交わる端部の内角が鋭角になるように盛りあがったバリ２１ｈ，２２ｈが形成されるので、注入される成形樹脂の一方の主面２１ｆ１，２２ｆ１上への流出を、バリ２１ｈ，２２ｈにより阻止することができ、発光素子のダイボンディング不良及びワイヤボンディング不良を防止できる。
また、本発明において、一端面２１ｅｆ，２２ｅｆにより形成される空洞に注入される樹脂は、その注入された樹脂の上面が一方の主面２１ｆ１，２２ｆ１と略同一平面上に位置するようにすることが好ましい。このようにすると、透光性樹脂４１を形成したときに、その透光性樹脂４１にバリ２１ｈ，２２ｈがくい込むような状態にでき、これにより、透光性樹脂４１とパッケージ成形体１との接合を強くできる。
【００１７】
これに対して、プレスの打ち抜き方向と樹脂を注入する方向を逆にした場合には、図４（ｂ）において矢印で示す方向から注入される成形樹脂は、バリ２１ｈ，２２ｈが形成された端部において樹脂の流れが阻害され、バリ２１ｈ，２２ｈの近傍に空洞２１ｇ，２２ｇが形成され、正負の電極リードと成形樹脂とが剥がれやすくなる等の問題が生じる。
さらに、端部２１ｅ，２２ｅの角θが鈍角になるので、図４（ｂ）において矢印で示す方向から注入される成形樹脂は、凹部の底面において端部２１ｅ，２２ｅから表面２１ｆ２，２２ｆ２上に流出し易くなり、図４（ｂ）に示すように、凹部１４の底面において、正の電極リード２１の表面２１ｆ１上と負の電極リード２２の表面２２ｆ１上とに成形樹脂が流出するという問題があり、ボンディング不良の原因となるという問題がある。
【００１８】
（ステップ３）
ステップ３では、図２（ａ）（ｂ）に示すように、凹部１４の底面に露出した負のリード電極２２上に、発光素子チップ３０を設け、そのｎ電極３３と負のリード電極２２とをワイヤボンディングにより接続し、ｐ電極３４と正のリード電極２１とをワイヤボンディングにより接続する。
ここで、発光素子チップ３０は、例えば、青色の発光が可能な窒化ガリウム系化合物半導体素子であり、該素子は、例えばサファイア基板３１上にｎ型層、活性層及びｐ型層を含む窒化物半導体層３２が形成され、活性層及びｐ型層の一部を除去して露出させたｎ型層の上にｎ電極３３が形成され、ｐ型層の上にｐ電極３４が形成されてなる。
【００１９】
（ステップ４）
ステップ４では、凹部１４に、発光素子チップ３０を覆うように透光性樹脂４１が充填される。
本実施の形態では、パッケージ成形体１の凹部１４の底面１４ｆに、正のリード電極２１に形成された切り込みの先端部又は開口部を介して成形樹脂が凹部１４の底面１４ｆに露出し、負のリード電極２２に形成された切り込みの先端部又は開口部を介して成形樹脂が凹部１４の底面１４ｆに露出しているので、露出した成形樹脂と透光性樹脂とが強固に接合され、透光性樹脂４１とパッケージ成形体１との接合を強くできる。
特に、本実施の形態においては、凹部１４の底面１４ｆに位置する正のリード電極２１にパッケージの縦軸に対して左右対称に２つの樹脂露出部２１ａが形成され、凹部１４の底面１４ｆに位置する負のリード電極２２にパッケージの縦軸に対して左右対称に２つの樹脂露出部２２ａが形成されているので、左右対称の配置をとらない場合に比較して、透光性樹脂４１とパッケージ成形体１との接合をより強くできる。
また、本実施の形態においては、凹部１４の縦軸に対して左右対称に２つの樹脂露出部２１ａが形成され、凹部１４の縦軸に対して左右対称に２つの樹脂露出部２２ａが形成されているので、左右対称の指向特性が得られる。
【００２０】
（ステップ５）
ステップ５では、個々の素子に分離する。
（ステップ６）
ステップ６では、図１（ｂ）に示すように、パッケージ成形体１の端面から突き出した正のリード電極２１と負のリード電極２２とを、図１（ｂ）に示すようにパッケージ成形体１の接合面の内側に折り曲げて、Ｊ−ベンド（Ｂｅｎｄ）型の正負の接続端子部を構成する。尚、本発明の接続端子部の構造は、Ｊ−ベンド（Ｂｅｎｄ）型に限られるものではなく、ガルウィング型等の他の構造であってもよい。
以上のようなステップで本実施の形態の発光装置は作製される。
【００２１】
以上のようにして作製された実施の形態の発光装置は、図３に示すように、実装基板６０の上に以下のようにして面実装される。
最初に、本実施の形態の発光装置において、接合面における第１凸部１１と第２凸部１２の間に仮固定用の熱硬化性樹脂５２をディスペンサーにより塗布し、実装基板６０上に、正のリード電極２１と正の電極パターン６１とが対向し、負のリード電極２２と負の電極パターン６２とが対向するように、本実施の形態の発光装置を載置する。
次に、棒状ヒーター又はパネルヒーター等により予備加熱を行い、熱硬化性樹脂５２を硬化させることにより仮固定する（予備加熱工程）。
そして、実装基板６０を発光装置が仮固定された面を下にして、その面を加熱溶融した半田浴に浸漬させることにより半田付けを行う。
半田付け後、冷却する。
【００２２】
以上のように構成された実施の形態の発光装置は、パッケージ成形体１の接合面に第１凸部１１と第２凸部１２を設けているので、仮固定用の樹脂５２をディスペンサーにより塗布して実装基板に仮固定したときに、はんだ付け部分に樹脂５２が付着することを防止でき、実装時におけるはんだ付け不良を防止できる。
【００２３】
【発明の効果】
以上詳細に説明したように、本発明に係る発光装置用のパッケージ成形体は、上記凹部の底面に、上記正のリード電極と上記負のリード電極の間の他に、上記成形樹脂が露出されてなる少なくとも一対の樹脂露出部を上記凹部の縦軸に対して左右対称に設けられているので、透光性樹脂を上記凹部に充填した時に、凹部の底面において縦軸に対して左右対称に設けられた上記一対の樹脂露出部の樹脂と透光性樹脂とを接合できる。
これにより、本発明に係る発光装置用のパッケージ成形体は、上記樹脂露出部を設けない場合及び樹脂露出部を左右対称に設けていない場合に比較して、該透光性樹脂とパッケージ成形体との接合強度を強くでき、例えば、気化膨張等に起因する上記透光性樹脂と上記パッケージ成形体との界面の剥離を効果的に防止することができる。
また、本発明に係る発光装置用のパッケージ成形体では、樹脂露出部が、上記凹部の縦軸に対して左右対称に設けられているので発光装置の指向特性を左右対称にできる。
また、この樹脂露出部は正又は負の電極リードに切り込み等を形成してその切り込み等の内部に成形樹脂が充填されるので、正又は負の電極リードと成形樹脂とを強固に固定でき、正又は負の電極リードと成形樹脂との剥離も防止できる。
これにより、本発明に係る発光装置用のパッケージ成形体によれば、指向特性を左右対称にでき、かつ従来例に比較してより厳しい使用環境にも耐えることができる信頼性の高い発光装置を構成できる。
【００２４】
また、本発明に係る発光装置は、上記凹部の底面の樹脂露出部の樹脂と透光性樹脂とを接合できるので、従来例に比較して、より厳しい使用環境にも耐えることができ、信頼性をより高くできる。
【図面の簡単な説明】
【図１】 （ａ）は本発明に係る実施の形態の発光装置の斜め上方向から見た斜視図であり、（ｂ）は本発明に係る実施の形態の発光装置の斜め下方向から見た斜視図である。
【図２】 （ａ）は、パッケージ成形体の凹部１４に発光素子チップを設け、その凹部１４に透光性樹脂を充填した後の実施の形態の発光装置の平面図であり、（ｂ）は（ａ）のＢ−Ｂ’線についての断面図である。
【図３】 本実施の形態の発光装置を基板上に実装したときの断面図である。
【図４】 図１（ａ）のＡ−Ａ’線についての断面の一部を示す断面図である。
【符号の説明】
１…パッケージ成形体、
１０…成形樹脂、
１１…第１凸部、
１２…第２凸部、
１４…凹部、
１４ｆ…底面、
２１…正のリード電極、
２２…負のリード電極、
２１ａ，２２ａ…切り込み、
２１ｂ，２２ｂ…開口部、
３０…発光素子チップ、
４１…透光性樹脂、
５２…仮固定用の樹脂、
６０…実装基板。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a package molded body for a light emitting device and a light emitting device using the package molded body.
[0002]
[Prior art]
In recent years, surface-mounted light emitting devices have been increasingly used in place of lead type light emitting devices for the purpose of miniaturization and thinning.
This surface-mount type light emitting device is configured by providing a light emitting element chip in a recess of a package molded body and filling a light transmitting resin so as to cover the light emitting element chip. Here, the package molded body is integrally molded with a molding resin so that the positive and negative lead electrodes are exposed on the bottom surface of the recess.
[0003]
[Problems to be solved by the invention]
However, when surface mount type light emitting devices are to be used more widely in the future, a light emitting device that can withstand more severe environmental conditions is desired, but considering use in severe environmental conditions, conventional surface mount type light emitting devices However, there is a problem that the adhesion between the translucent resin filled in the recess and the package molded body is not sufficient.
[0004]
Therefore, the present invention can further strengthen the adhesive force between the package molded body that can more strongly adhere to the translucent resin filled in the recesses, and the packaged molded body filled with the translucent resin filled in the recesses, It is an object to provide a surface mount type light emitting device with higher reliability.
[0005]
[Means for Solving the Problems]
In order to achieve the above object, a package molded body for a light emitting device according to the present invention has a concave portion for accommodating a light emitting element chip, positive and negative lead electrodes, and the positive lead on the bottom surface of the concave portion. In the package molded body in which the positive lead electrode and the negative lead electrode are integrally molded by injection of molding resin so that the electrode and the negative lead electrode are exposed at a predetermined interval, the positive lead The electrode or the negative lead electrode has a cut or an opening at a position symmetrical with respect to the longitudinal axis of the recess, and a burr is formed at the end where the main surface and the end surface opposite to the injection side of the molding resin intersect. In addition to the gap between the positive lead electrode and the negative lead electrode, at least a pair of exposed resin portions formed by exposing the molding resin is formed on the bottom surface of the concave portion on the vertical axis of the concave portion. Against The package formed body thus configured is characterized in that it is provided symmetrically when the light emitting element chip is provided in the recess and the translucent resin is filled in the recess. Since the resin and the translucent resin of the pair of exposed resin portions provided symmetrically with respect to the left and right can be bonded to each other, compared to the case where the exposed resin portion is not provided and the case where the exposed resin portion is not provided symmetrically. Thus, the bonding strength between the translucent resin and the package molded body can be increased.
Thereby, the package molded object for light-emitting devices which concerns on this invention can prevent effectively peeling of the interface of the said translucent resin and said package molded object resulting from vaporization expansion etc., for example.
Further, in the package molded body for the light emitting device according to the present invention, since the resin exposed portions are provided symmetrically with respect to the longitudinal axis of the concave portion, the directivity characteristics of the light emitting device can be made symmetrical.
Further, since the resin exposed portion is formed with a notch or the like in the positive or negative electrode lead and the inside of the notch or the like is filled with molding resin, the positive or negative electrode lead and the molding resin can be firmly fixed. Further, peeling between the positive or negative electrode lead and the molding resin can be prevented.
As a result, according to the package molded body for a light emitting device according to the present invention, a highly reliable light emitting device that can make the directivity symmetrical and can withstand a more severe use environment than the conventional example. Can be configured.
[0006]
Further, in the package molded body for a light emitting device according to the present invention, the positive and negative electrode leads and the molded resin in the package molded body are more firmly fixed, and the bonding strength between the translucent resin and the package molded body is increased. In order to make it stronger, it is preferable that at least one pair of the resin exposed portions is provided on each of the positive lead electrode side and the negative lead electrode side.
[0007]
The light emitting device according to the present invention includes a package molded body for the light emitting device according to the present invention and a light emitting element chip provided in the concave portion of the package molded body, and the light emitting element chip is disposed in the concave portion. Molded with a translucent resin.
Since the light emitting device according to the present invention configured as described above can join the resin of the resin exposed portion on the bottom surface of the recess and the light transmissive resin, the bonding strength between the light transmissive resin and the package molded body can be further increased. Can be strong.
As a result, the light emitting device according to the present invention can withstand a harsher use environment and can be more reliable than the conventional example.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, a light emitting device according to an embodiment of the present invention will be described.
The light emitting device of the embodiment according to the present invention is configured as follows.
In the light emitting device of the present embodiment, the package molded body 1 is produced by integrally molding a positive lead electrode 21 and a negative lead electrode 22 with a molding resin 10 as shown in FIG. .
More specifically, the concave portion 14 for accommodating the light emitting element chip 30 is formed on the upper surface of the package molded body 1, and the positive lead electrode 21 and the negative lead electrode 22 are separated from each other on the bottom surface of the concave portion 14. Thus, each main surface is provided so as to be exposed.
In the present specification, the upper surface of the package molded body 1 refers to the surface on which the light emitting element chip is placed, and the lower surface refers to the surface facing the mounting substrate.
[0009]
Further, one end of the positive lead electrode 21 and one end of the negative lead electrode 22 are provided so as to face each other at the bottom of the recess 14, and between the one end of the positive lead electrode 21 and one end of the negative lead electrode 22. Is filled with a molding resin to form the bottom surface of the recess 14.
Further, in the package molded body 1, the other end of the positive lead electrode 21 and the other end of the negative lead electrode 22 are provided so as to protrude from the end face of the package molded body 1, and the protruding portions are shown in FIG. ), The positive and negative connection terminal portions are formed by being bent inside the joint surface, which is the lower surface of the package molded body 1.
[0010]
Here, in particular, in the light emitting device of the present embodiment, the first convex portion 11 is integrally formed with the molded resin 10 along the other end of the bent positive lead electrode 21 on the joint surface of the package molded body 1. The second convex portion 12 is formed integrally with the molded resin 10 along the other end of the bent negative electrode lead 22, whereby the light emitting device of the embodiment is mounted on the substrate. Reduces soldering defects.
In the light emitting device of the present embodiment, it is preferable that the first convex portion 11 and the second convex portion 12 are formed so as to have the same shape and a cross-sectional shape of a square or a trapezoid.
Furthermore, the outer surface of the positive and negative electrode leads facing the mounting substrate and the outer surfaces of the mounting substrate of the first convex portion 11 and the second convex portion 12 are substantially flush with each other so as to be in contact with the mounting substrate. It is preferably configured to be located above.
A light emitting element chip is provided in the recess 14 of the package molded body 1 configured as described above, and a light transmitting device is filled in the recess 14 so as to cover the light emitting element chip. Is done.
[0011]
Next, a method for manufacturing the light emitting device of this embodiment will be described.
(Step 1)
In this manufacturing method, first, in step 1, for example, a long metal plate made of iron-containing copper having a thickness of 0.15 mm is punched using a press to form a plurality of portions to be positive and negative lead electrodes of each package molded body. To do.
Here, in the present embodiment, the punching direction of the press (the direction in which the punch is moved with respect to the die) is made to coincide with the direction in which the molding resin flows in the injection molding described later.
[0012]
In the portion corresponding to each package formed body of the long metal plate after the press working, the positive lead electrode 21 has its one end face opposed to one end face of the negative lead electrode 22 at the bottom face of the recess 14 after forming. The lead electrode 22 is separated from the negative lead electrode 22.
The positive lead electrode 21 is formed with an opening having a center line perpendicular to one end face of the positive lead electrode 21 as an axis in order to increase the bonding strength with the molding resin. In order to increase the bonding strength with the molding resin, an opening having a center line perpendicular to one end face of the negative lead electrode 22 as an axis is formed.
The opening is provided so as to extend over the inner side and the outer side of the end of the package molded body to increase the bonding strength between the positive and negative lead electrodes 21 and 22 and the molding resin, and The positive lead electrode 21 and the negative lead electrode 22 protruding from the end face can be bent so that the terminal structure becomes a J-bend structure so that a large force is not applied to the package resin.
Further, two cuts or openings are formed in the positive lead electrode 21 at positions symmetrical to the center line perpendicular to the one end face, and the negative lead electrode 22 has a center line perpendicular to the one end face. In contrast, two cuts or openings are formed at symmetrical positions.
The notches or openings formed at symmetrical positions in the positive electrode lead and the negative electrode lead have such depths or positions that the tip portion or the opening of the notch is located on the bottom surface of the recess 14 after injection molding. Formed.
Here, in the present embodiment, the center line perpendicular to one end face of the positive lead electrode 21 and the center line perpendicular to one end face of the negative lead electrode 22 are made to coincide with each other, and the center line is the vertical axis of the recess 14. (In this specification, one of the two orthogonal axes of the recess 14 that coincides with the central axis is referred to as the vertical axis for convenience, and the other axis is referred to as the horizontal axis.) Molded.
[0013]
(Step 2)
In Step 2, the long metal plate punched in Step 1 is subjected to Ag plating, then set in a molding die, and the molding resin portions 10 are respectively formed in portions corresponding to the respective package molded bodies by injection molding. Form.
[0014]
In the present embodiment, the molding die for molding the molded resin portion 10 is
(1) In the molded resin portion 10, the ridge-shaped first convex portion 11 and the second convex portion 12 are formed on the joint surfaces on both sides of the gate.
(2) In the molded resin portion 10, the concave portion 14 for housing the light emitting element chip is formed symmetrically with respect to the longitudinal axis of the package molded body on the surface opposite to the bonding surface.
(3) The positive lead electrode 21 and the negative lead electrode 22 separated from each other are exposed on the bottom surface of the concave portion 14, and the molding resin is filled between the positive lead electrode 21 and the negative lead electrode 22. In addition,
(4) In the positive lead electrode 21 positioned on the bottom surface of the recess 14, two resin exposed portions 21 a are formed symmetrically with respect to the longitudinal axis of the recess 14, and in the negative lead electrode 22 positioned on the bottom surface of the recess 14 The two resin exposed portions 22a are formed symmetrically with respect to the longitudinal axis of the recess 14.
[0015]
Further, in the present embodiment, the gate of the molding die is located at a position between the first convex portion 11 and the second convex portion 12 on the joint surface so that the resin is injected from the joint surface side of the package molded body 1. The long metal plate that is provided and pressed in the molding die is provided such that the stamping direction of the press coincides with the direction of injecting the resin into the molding die.
As described above, in the present embodiment, when the package molded body 1 is manufactured, the end faces 21ef and 22ef of the positive and negative lead electrodes 21 and 22 are matched by matching the punching direction of the press with the direction of injecting the resin. Thus, the space formed can be filled without a gap, and the injected molding resin can be prevented from flowing out onto the one main surface 21f1, 22f1.
[0016]
That is, in the press punching process, the long metal plate 201 is set so that the die which is the receiving mold is in contact with one of the surfaces 21f1 and 22f1 of the positive and negative lead electrodes 21 and 22, and the punch is made positive and negative. Since the lead electrodes 21 and 22 are moved from the other surfaces 21f2 and 22f2 and punched out, the positive and negative lead electrodes 21 and 22 are respectively formed between the other main surfaces 21f2 and 22f2 and the one end surfaces 21ef and 22ef. The internal angle θ of the intersecting end portions 21e and 22e becomes an obtuse angle (FIG. 4A).
Accordingly, the molding resin injected from the direction indicated by the arrow in FIG. 4A does not hinder the flow at the end portions 21e and 22e, so that the molding die formed corresponding to the bottom surface 14f It is possible to fill the cavity formed by the surface and the one end faces 21ef, 22ef of the positive and negative lead electrodes 21, 22 without any gap.
In the press punching process, the punch is moved and punched from the other surface 21f2, 22f2 side of the positive and negative lead electrodes 21, 22, as described above, so that the positive and negative lead electrodes 21, 22 are respectively Then, burrs 21h and 22h are formed at the ends where one main surface 21f1 and 22f1 and one end surfaces 21ef and 22ef intersect (FIG. 4A).
In this way, the burrs 21h and 22h are formed so that the inner angle of the end portion where one of the main surfaces 21f1 and 22f1 and the one end surface 21ef and 22ef intersect is an acute angle. Outflow onto the main surfaces 21f1 and 22f1 can be blocked by the burrs 21h and 22h, and die bonding failure and wire bonding failure of the light emitting element can be prevented.
In the present invention, the resin injected into the cavity formed by the one end surfaces 21ef and 22ef is such that the upper surface of the injected resin is positioned substantially on the same plane as the one main surface 21f1 and 22f1. Is preferred. In this way, when the translucent resin 41 is formed, the burrs 21h and 22h can be inserted into the translucent resin 41, whereby the translucent resin 41, the package molded body 1, and the like. Can be strengthened.
[0017]
In contrast, when the punching direction of the press and the direction of injecting the resin are reversed, the molding resin injected from the direction indicated by the arrow in FIG. 4B is the end where the burrs 21h and 22h are formed. The flow of the resin is inhibited at the portion, and cavities 21g and 22g are formed in the vicinity of the burrs 21h and 22h, so that the positive and negative electrode leads and the molded resin are easily peeled off.
Further, since the angle θ of the end portions 21e and 22e becomes an obtuse angle, the molding resin injected from the direction indicated by the arrow in FIG. 4B is transferred from the end portions 21e and 22e onto the surfaces 21f2 and 22f2 on the bottom surface of the recess. As shown in FIG. 4B, there is a problem that the molding resin flows out on the surface 21f1 of the positive electrode lead 21 and on the surface 22f1 of the negative electrode lead 22 at the bottom surface of the recess 14 as shown in FIG. There is a problem of causing a bonding failure.
[0018]
(Step 3)
In step 3, as shown in FIGS. 2A and 2B, the light emitting element chip 30 is provided on the negative lead electrode 22 exposed on the bottom surface of the recess 14, and the n electrode 33, the negative lead electrode 22, Are connected by wire bonding, and the p-electrode 34 and the positive lead electrode 21 are connected by wire bonding.
Here, the light emitting element chip 30 is, for example, a gallium nitride compound semiconductor element capable of emitting blue light, and the element includes, for example, a nitride including an n-type layer, an active layer, and a p-type layer on a sapphire substrate 31. A semiconductor layer 32 is formed, an n-electrode 33 is formed on the n-type layer exposed by removing a part of the active layer and the p-type layer, and a p-electrode 34 is formed on the p-type layer. .
[0019]
(Step 4)
In step 4, the recess 14 is filled with a translucent resin 41 so as to cover the light emitting element chip 30.
In the present embodiment, the molding resin is exposed to the bottom surface 14f of the concave portion 14 through the front end portion or the opening of the cut formed in the positive lead electrode 21 on the bottom surface 14f of the concave portion 14 of the package molded body 1. Since the molding resin is exposed to the bottom surface 14f of the recess 14 through the front end or opening of the cut formed in the lead electrode 22, the exposed molding resin and the translucent resin are firmly bonded to each other. Bonding between the light-sensitive resin 41 and the package molded body 1 can be strengthened.
In particular, in the present embodiment, two resin exposed portions 21a are formed symmetrically with respect to the longitudinal axis of the package on the positive lead electrode 21 located on the bottom surface 14f of the concave portion 14, and are positioned on the bottom surface 14f of the concave portion 14. Since the negative lead electrode 22 is formed with two resin exposed portions 22a symmetrically with respect to the longitudinal axis of the package, the translucent resin 41 and the package are compared with the case where the symmetrical arrangement is not taken. Bonding with the molded body 1 can be made stronger.
Further, in the present embodiment, two resin exposed portions 21 a are formed symmetrically with respect to the vertical axis of the concave portion 14, and two resin exposed portions 22 a are formed symmetrically with respect to the vertical axis of the concave portion 14. As a result, symmetrical directivity can be obtained.
[0020]
(Step 5)
In step 5, the individual elements are separated.
(Step 6)
In step 6, as shown in FIG. 1B, the positive lead electrode 21 and the negative lead electrode 22 protruding from the end face of the package molded body 1 are replaced with the package molded body 1 as shown in FIG. The inside of the joint surface is bent to form a J-Bend type positive and negative connection terminal portion. Note that the structure of the connection terminal portion of the present invention is not limited to the J-bend type, and may be another structure such as a gull wing type.
Through the steps as described above, the light-emitting device of this embodiment is manufactured.
[0021]
The light-emitting device of the embodiment manufactured as described above is surface-mounted on the mounting substrate 60 as follows as shown in FIG.
First, in the light emitting device of the present embodiment, a temporary fixing thermosetting resin 52 is applied between the first convex portion 11 and the second convex portion 12 on the joint surface by a dispenser, The light emitting device of the present embodiment is placed so that the positive lead electrode 21 and the positive electrode pattern 61 face each other, and the negative lead electrode 22 and the negative electrode pattern 62 face each other.
Next, preliminary heating is performed by a bar heater or a panel heater, and the thermosetting resin 52 is cured and temporarily fixed (preheating step).
Then, the mounting substrate 60 is soldered by placing the surface on which the light emitting device is temporarily fixed facing down and immersing the surface in a heat-melted solder bath.
Cool after soldering.
[0022]
In the light emitting device of the embodiment configured as described above, the first convex portion 11 and the second convex portion 12 are provided on the joint surface of the package molded body 1, so that the temporarily fixing resin 52 is applied by a dispenser. Thus, when temporarily fixed to the mounting substrate, it is possible to prevent the resin 52 from adhering to the soldered portion, and it is possible to prevent poor soldering during mounting.
[0023]
【The invention's effect】
As described above in detail, in the package molded body for a light emitting device according to the present invention, the molding resin is exposed on the bottom surface of the recess, in addition to the space between the positive lead electrode and the negative lead electrode. Since the at least one pair of exposed resin portions are provided symmetrically with respect to the longitudinal axis of the recess, when the translucent resin is filled in the recess, the bottom surface of the recess is symmetrical with respect to the longitudinal axis. The resin of the pair of exposed resin portions provided and the translucent resin can be joined.
Thereby, the package molded body for the light-emitting device according to the present invention has the light-transmitting resin and the package molded body as compared with the case where the resin exposed portion is not provided and the case where the resin exposed portion is not provided symmetrically. Can be strengthened, and for example, peeling of the interface between the translucent resin and the package molded body due to vaporization expansion or the like can be effectively prevented.
Further, in the package molded body for the light emitting device according to the present invention, since the resin exposed portions are provided symmetrically with respect to the longitudinal axis of the concave portion, the directivity characteristics of the light emitting device can be made symmetrical.
In addition, since the resin exposed portion forms a cut or the like in the positive or negative electrode lead and the molding resin is filled inside the cut or the like, the positive or negative electrode lead and the molded resin can be firmly fixed, Peeling between the positive or negative electrode lead and the molding resin can also be prevented.
As a result, according to the package molded body for a light emitting device according to the present invention, a highly reliable light emitting device that can make the directivity symmetrical and can withstand a more severe use environment than the conventional example. Can be configured.
[0024]
In addition, since the light emitting device according to the present invention can join the resin of the resin exposed portion on the bottom surface of the concave portion and the translucent resin, the light emitting device can withstand a more severe use environment as compared with the conventional example, and is reliable. The sex can be made higher.
[Brief description of the drawings]
FIG. 1A is a perspective view of a light emitting device according to an embodiment of the present invention as seen from an obliquely upward direction, and FIG. 1B is a perspective view of the light emitting device according to an embodiment of the present invention as seen from an obliquely downward direction. FIG.
FIG. 2A is a plan view of the light emitting device of the embodiment after a light emitting element chip is provided in the recess 14 of the package molded body, and the recess 14 is filled with a translucent resin; FIG. 4 is a cross-sectional view taken along line BB ′ in FIG.
FIG. 3 is a cross-sectional view when the light-emitting device of the present embodiment is mounted on a substrate.
FIG. 4 is a cross-sectional view showing a part of a cross section taken along line AA ′ of FIG.
[Explanation of symbols]
1 ... Package molded body,
10 ... molding resin,
11 ... 1st convex part,
12 ... 2nd convex part,
14 ... recess,
14f ... the bottom surface,
21 ... Positive lead electrode,
22 ... negative lead electrode,
21a, 22a ... notches,
21b, 22b ... opening,
30: Light emitting element chip,
41 ... translucent resin,
52 ... Resin for temporary fixing,
60: Mounting board.

Claims (3)

発光素子チップを収納する凹部と正と負のリード電極とを有し、上記凹部の底面において上記正のリード電極と上記負のリード電極とが所定の間隔を隔てて露出するように上記正のリード電極及び上記負のリード電極が成形樹脂の注入により一体成形されてなるパッケージ成形体において、
上記正のリード電極又は負のリード電極は、上記凹部の縦軸に対して左右対称の位置に切り込み又は開口部を有すると共に、上記成形樹脂の注入側と反対の主面と端面とが交わる端部にバリが形成されており、
上記凹部の底面に、上記正のリード電極と上記負のリード電極の間の他に、上記成形樹脂が露出されてなる少なくとも一対の樹脂露出部が、上記凹部の縦軸に対して左右対称に設けられたことを特徴とするパッケージ成形体。A concave portion for accommodating the light emitting element chip and positive and negative lead electrodes; and the positive lead electrode and the negative lead electrode are exposed at a predetermined interval on the bottom surface of the concave portion. in the molded package to the lead electrodes and the negative lead electrode is integrally formed by injection of the molding resin,
The positive lead electrode or the negative lead electrode has a notch or an opening at a position symmetrical to the longitudinal axis of the concave portion, and an end where the main surface and the end surface opposite to the molding resin injection side intersect Burr is formed in the part ,
In addition to the space between the positive lead electrode and the negative lead electrode, at least a pair of resin exposed portions in which the molding resin is exposed are symmetrical with respect to the longitudinal axis of the recess. A packaged molded body characterized by being provided. 上記樹脂露出部は、上記正のリード電極側と上記負のリード電極側とにそれぞれ少なくとも１対設けられた請求項１記載のパッケージ成形体。  The package molded body according to claim 1, wherein at least one pair of the resin exposed portions is provided on each of the positive lead electrode side and the negative lead electrode side. 請求項１又は２に記載のパッケージ成形体と、該パッケージ成形体の上記凹部に設けられた発光素子チップとを備え、該発光素子チップが上記凹部内で透光性樹脂によってモールドされてなる発光装置。  A light emitting device comprising: the package molded body according to claim 1 or 2; and a light emitting element chip provided in the concave portion of the package molded body, wherein the light emitting element chip is molded with a translucent resin in the concave portion. apparatus.
JP2001018509A 2001-01-26 2001-01-26 Package molded body and light emitting device Expired - Fee Related JP3636079B2 (en)

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