JP2010186887A - 発光装置の製造方法 - Google Patents
発光装置の製造方法 Download PDFInfo
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Abstract
【解決手段】発光装置1の製造方法において、搭載部3上の発光素子2を、加熱によって軟化したガラス材11により封止するにあたり、金型92をガラス材11の上面に部分的に接触させて押し込んでガラス材11を部分的に凹ますことにより、ガラス材11の上面における金型92と非接触の部分を変形させ、ガラス材11の上面の少なくとも一部に湾曲面を形成するようにした。
【選択図】図4B
Description
まず、ガラス成分の酸化物粉末を1200℃に加熱し、溶融状態で撹拌する。そして、ガラスを固化した後、ガラス封止部6の厚さに対応するようスライスして板状に加工する(板状加工工程)。
尚、焼成されたセラミックに回路パターン4を形成するにあたっては、Wペーストを印刷して熱処理したものに代えて、Cr,Ti等の金属を蒸着したもの、Cu箔を貼り付けた後に所定形状にエッチングしたもの等とし、これにNiめっき及びAuめっきを施すようにしてもよい。
図3(a)に示すように、複数のLED素子2を縦及び横について等間隔で配線基板3に実装する(素子実装工程)。具体的には、配線基板3の回路パターン4の表面パターン41に複数のLED素子2を各Auバンプ28によって電気的に接合する。本実施形態においては、p側2点、n側1点の合計3点のバンプ接合が施される。
次いで、図4Aに示すように、略平坦な配線基板3の実装面に封止前ガラス11を重ねて、各LED素子2を覆うように封止前ガラス11を配置する(ガラス配置工程)。この後、下金型91及び上金型92を加圧し、窒素雰囲気中で加熱によって軟化したガラス材のホットプレス加工を行う。このとき、封止前ガラス11は、配線基板3への配置前に加熱されていてもよいし、配置後に加熱されるようにしてもよい。ホットプレス加工は、上金型92から封止前ガラス11に配線基板3方向へ圧力を加えることにより行われる。これにより、LED素子2が搭載された配線基板3に封止前ガラス11が融着され、LED素子2は配線基板3上で封止前ガラス11により封止される。ここで、ホットプレス加工は、各部材に対して不活性な雰囲気中で行えばよく、窒素雰囲気の他に例えば真空中で行うようにしてもよい。
このとき、図4Bに示すように、上金型92の接触部92bを封止前ガラス11の上面に部分的に接触させて押し込んで封止前ガラス11を部分的に凹ますことにより、この上面における上金型92と非接触の部分を変形させ、上面に湾曲面を形成する(加圧工程)。本実施形態においては、封止前ガラス11の上面の全体にわたって湾曲面が形成され、各LED素子2の直上部分にも湾曲面が形成されている。
図5に示すように、平面視にて、発光装置1は正方形状を呈し、ガラス封止部6の外縁に平坦面6cが形成される。平坦面6cには上金型92からの圧力が直接的に加わっていることから、ガラス封止部6は平坦面6cの下側にて配線基板3と比較的強固に接合されている。
c ≧ a − (a−b)・(1+tanθ)/2
とすることが好ましい。
まず、ZnO−B2O3−SiO2−Nb2O5−Na2O−Li2O系の熱融着ガラスを粉砕し、これに例えばYAGからなる黄色蛍光体の粒子を混合し、蛍光体粒子がガラスの粉末内に均一に分散されたガラス粉末10を生成する(粉砕工程)。
粉砕工程にて生成されたガラス粉末10を荷重を加えながら溶融した後に、ガラス粉末10を固化して封止前ガラス11を生成する(ガラス生成工程)。具体的には、図18(a)に示すように、下台80の平坦な上面80aに、下台80上の所定領域を包囲する筒状の側面枠81を設けて、上方を開口した凹部82を形成する。凹部82は上下にわたって同じ断面であり、凹部82の断面形状に対応して形成された荷重治具83の下部83aが、凹部82内で上下に移動可能となっている。この凹部82にガラス粉末10を入れた後、凹部82内を加圧する荷重治具83をセットする。そして、雰囲気空気を、7.6Torrに減圧するとともに650℃に加熱し、荷重治具83を利用して20kg/cm2の圧力をガラス粉末10に加えて溶解する。
2 LED素子
3 配線基板
3a ビアホール
4 回路パターン
4a W層
4b Ni層
4c Au層
4d Ag層
5 中空部
6 ガラス封止部
6a 上面
6b 側面
6c 平坦面
6d 第2平坦面
6f 湾曲面
10 ガラス粉末
11 封止前ガラス
11a 凹部
12 中間体
20 成長基板
21 バッファ層
22 n型層
23 MQW層
24 p型層
25 p側電極
26 p側パッド電極
27 n側電極
27a Al層
27b Ni層
27c Au層
28 Auバンプ
41 表面パターン
42 裏面パターン
43 ビアパターン
44 外部接続端子
80 下台
80a 上面
81 側面枠
82 凹部
83 荷重治具
83a 下部
91 下金型
92 上金型
92a 本体
92b 接触部
93 気体層
101 発光装置
106d 面取り部
192 上金型
192c 面取り部
201 発光装置
206b 側面
292 上金型
292b 接触部
301 発光装置
304 回路パターン
306a 上面
306b 側面
306c 平坦面
392 上金型
392b 接触部
Claims (6)
- 搭載部上の発光素子を、加熱によって軟化したガラス材により封止する際またはその後に前記ガラス材を加工する際に、
金型を前記ガラス材の上面に部分的に接触させて押し込んで当該ガラス材を部分的に凹ますことにより、当該上面における前記金型と非接触の部分を変形させ、前記ガラス材の上面の少なくとも一部に湾曲面を形成する発光装置の製造方法。 - 前記金型は、前記ガラス材の前記上面における前記発光素子の直上部分と非接触であり、当該上面の前記直上部分の周辺と接触する請求項1に記載の発光装置の製造方法。
- 前記ガラス材の前記上面の前記直上部分に前記湾曲面を形成する請求項2に記載の発光装置の製造方法。
- 前記搭載部には複数の前記発光素子が実装され、
前記金型は、前記ガラス材の前記上面における隣接する前記発光素子の中間部分と接触する請求項3に記載の発光装置の製造方法。 - 前記湾曲面を形成された前記ガラス材が硬化した後、
前記ガラス材の前記凹部にダイシングブレードを進入させ、前記ガラス材及び前記搭載部を分割する請求項4に記載の発光装置の製造方法。 - 前記金型は、前記ガラス材と接触する接触部が格子状に形成される請求項5に記載の発光装置の製造方法。
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