CN1102467A - 发光二极管(led)指示灯 - Google Patents

发光二极管(led)指示灯 Download PDF

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CN1102467A
CN1102467A CN94108913A CN94108913A CN1102467A CN 1102467 A CN1102467 A CN 1102467A CN 94108913 A CN94108913 A CN 94108913A CN 94108913 A CN94108913 A CN 94108913A CN 1102467 A CN1102467 A CN 1102467A
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emitting elements
light
semiconductor light
sealing resin
emitting
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CN1062981C (zh
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河本聪
田中敏明
藤村则夫
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Toshiba Corp
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Abstract

本发明的LED指示灯是具有高混色性能、并且 发光强度大的多色光LED指示灯。由至少发二色 光的多个半导体发光元件1R和1G、承载地多个半 导体发光元件的引线支架2和包围多个半导体发光 元件的透光密封树脂外表4所构成。密封树脂外表 在与多个半导体发光元件连线平行方向上的曲率小 于垂直方向的曲率。

Description

本发明涉及是关于产生多色光的LED指示灯，特别是关于具有高混色性能并且具有高发光度的多色LED指示灯。
现有技术中的LED指示灯，如图4中所示，其密封多个发光元件1R和1G的树脂外壳14一般均作成在与发光元件1R和1G连成的平行方向和垂直方向上具有一定曲率的旋转体的结构（现有技术实施例1）。
在具有这种外形形状的LED指示灯的情况下，由于该密封树脂外形14的透镜作用，而使发光元件1R和1G以各自的方向发光。这是因为发光元件1R和1G的安置位置相互不同而产生的现象，要使发光元件1R和1G所发出的光取同一方向在物理上是难以做到的。
因此，在此第一现有技术的LED指示灯示例中，由于发光元件1R和1G的不同发光颜色的光向着各自的方向放射，因而存在着明显有损于LED指示灯混色性能的缺点。
作为改善这种混色性能问题的方法之一是将LED指示灯设计成如图5中所示的结构（第二现有技术实例）。这里借助减小密封树脂外表24的曲率，以减低所给出的光的强度分布在方向上的依从关系，从而能增大由各发光元件1R和1G所发出的光的混色区域来改善混色性能。
但是，在具有这种外表形状的第二现有技术实例的情况下，由于密封树脂外表24所形成的透镜作用减小，正面方向上获取的光的强度降低，因而产生不能获得所必须光强度的缺点。
如上所述，过去的产生多色光的LED指示灯，由于多数发光元件的安置位置相互不同，由各发光元素所发出的不同色光向各自的方向放射，因而存在着明显影响LED指示灯的混色性能的缺陷。
而且，在为改善这一混色性能，减小密封树脂外表的曲率以降低所得到的光的强度分布对方向的依赖性时，因为由密封树脂外表所形成的透镜作用减小，而出现正面方向上所得到的光的强度降低，因而得不到所需强度的问题。
本发明就是要解决上述问题，其目的是提供具有高混色性能并且有足够发光度的多色光LED指示灯。
为解决上述问题，本发明的第一特征是，如图1所示，设置有产生至少二色光以上的多个半导体发光元件1R和1G、承载所述多个半导体发光元件1R和1G的引线架2、和包围所述多个半导体发光元件1R和1G的透光性密封树脂外表4，所述密封树脂外表4，在与所述多个半导体发光元件1R和1G的连线相平行方向上的曲率要比垂直方向上的曲率小。
本发明的第二特征是在所述的LED指示灯中，所述密封树脂外表4呈椭园体或者椭园体的一部的形状，而且所述多个半导体发光元件1R和1G的连线与该椭园体的长轴大致相平行。
本发明的第三特征是在所述的LED指示灯中，所述多个半导体发光元件，如图2所示，设置有包含发红光，绿光和蓝光的半导体发光元件的三个以上半导体发光元件1R、1G和1B。
本发明的第四特征是在所述的LED指示灯中，所述密封树脂外表相对于所述多个半导体发光元件1R、1G和/或1B的连线，其平行方向的直径a与垂直方向的直径b之比为1.2以上。
在本发明特有的LED指示灯中，设置有至少产生二色或三色以上光的半导体发光元素1R和1G，或1R、1G和1B。密封树脂外表4，例如呈椭园体或椭园体的一部分的形状，而且使该椭园体的长轴大致平行于多个半导体发光元件1R、1G和1B的连线相平行的曲率要小于垂直方向的曲率。
这样，由于在与多个半导体发光元件1R、1G和1B的连线相平行的方向上，密封树脂外表4的曲率相对地要小，所以就能使射出的光的强度分布对方向的依赖性减小，另一方面，由于在垂直方向上密封树脂外表4的曲率相对地增大，而不致使由密封树脂外表4的透镜作用所产生的聚焦作用有明显地降低，而能得到所必须的光的强度。结果，就能够实现不但具有高混色性能，而且具有高发光强度的多色发光LED指示灯。
而且密封树脂外表4，在相对于多个半导体发光元件1R、1G和1B的连线平行方向的直径a对垂直方向直径b之比为1.2以上时，上述效果表现更为显著。
下面按照附图来说明有关本发明的实施例。
图1表示本发明第一实施例的结构图。同一图中，与图4和图5（现有技术实施例）相重复的部分采用相同的符号。图1（b）为正面方向的断面图，图1（a）为图1（b）所示断面形状椭园短轴方向的侧面图，图1（c）为图1（b）所示断面形状椭园长轴方向的侧面图。
图1中，本实施例LED指示灯设置有发红色的半导体发光元件1R、发绿色光的半导体发光元件1G，承载半导体发光元件1R和1G的引线支架2，和包围半导体发光元件1R和1G的透光密封树脂外表4;半导体发光元件1R和1G与引线支架2以金属线3相连接。
本实施例LED指示灯按如下方式制作。
首先，将二个半导体元件1R和1G采用导电性环氧树脂各自安装并固定在引线支架2上。这里，作为二个半导体发光元件1R和1G，例如可以采用GaAlAs或AsP等的红色半导体发光元件1R，和可采用GaP或InGaAIP等的颜色半导体发光元件1G。
然后，在铸型模中注入液态透明环氧树脂，在将引线支架2的元件承载部分插入充分透明的环氧树脂后，将透明环氧树脂加以热固化。此时，依靠将铸型模的内壁形状作成椭园形状等等，就能够形成含有椭园体或椭园体一部分的形状的密封树脂外表4。
将经铸型模硬化后的密封树脂4脱离铸模，最后，为使制造容易而将经连接的引线支架2切断成规定的形状，完成LED指示灯的制做。
现在利用图3（a）所示图形来说明本实施例LED指示灯的混色性能改善的效果。图3（a）分别表示相对于本实施例长宽比的混色区域（图中的特性A）、相对于本实施例长宽比的正面光强度（图中的特性B）、和相对于现有长宽比的正面光强度（图中的特性C）。
本实施例的长度比是相对于半导体发光元件1R和1G的连线的垂直方向密封树脂外表4的曲率与平行方向密封树脂外形4的曲率之比，亦即，在图1（a）所示的断面形状的椭园中的半长轴a/半短轴b。第二现有技术实施例的长宽比为在图5（b）所示断面形状的园的直径与图1（a）所示断面形状的椭园的长半轴相等时，园的直径（长半轴）与半短轴之比，亦即图5（a）中的a/b。
混色区域如图3（b）所示，它是由当半导体发光元件1R的发光区 域为5R、半导体发光元件1G的发光区域为5G时所形成的混色区域（可看到二色相混合的区域）6的角度Q[0°]的大小来确定的。
在图3（a）中，由表示混色区域的特性A可明显看到随着长宽比的增大，混色区域6大幅度也增大。特别是，在长宽比达到1.2以上时，可看到几乎完全接近的混色特性。
而由表示正面光强度的特性B和C则可看到，与其有等于本实施例中椭园的长半轴的曲率的球形密封外表（第二现有技术实施例）相比较，本实施例中LED指示灯的效果大大地改善。
下面对图2中所示的作为本发明第二实施例的LED指示灯的结构予以说明。
图2（b）为正面方向的断面图，图2（a）为图2（b）所示断面形状椭园的短轴方向的侧面图。而图2（b）所示断面形状椭园的长轴方向的侧面图则与图1（c）相同。
在图2中，本实施例LED指示灯设置有，发红光的半导体发光元件1R、发绿光的半导体发光元件1G、发蓝光的半导体发光元件1B，承载半导体发光元件1R、1G和1B的引线支架2，以及包围半导体发光元件1R、1G和1B的透光密封树脂外表4;半导体发光元件1R、1G和1B与引线支架2以金属线3相连接。
作为半导体发光元件1R、1G和1B，例如说可以采用GaAlAs或GaAsP等红色半导体发光元件1R、GaP或InGaAlP等绿色半导体发光元件1G以及Sic等蓝色半导体发光元件1B。
其制造方法、特性等，均与第一实施例相同。
采用上述的本发明，设置有至少发二色或三色光的多个半导体发光元件，密封外表例如作成具有椭园体或椭园体的一部分的形状， 并且由于相对于多个半导体发光元件连线该椭园体的长轴大致相平行，而且其在与多个半导体发光元件连线相平行的方向的曲率作成小于垂直方向的曲率，在与多个半导体发光元件连线相平行的方向上密封树脂外表的曲率就相对减小了，因而能减小发射出的光的强度分布对方向的依赖性;另一方面，由于在垂直方向密封树脂外形的曲率相对地增大了，因而不会过份的降低由密封树脂外表的透镜作用所引起的集聚作用，从而可获得所需的光强度。因而就能够提供具有的混色性能并且发光强度大的多色光LED指示灯。
附图简要说明：
图1为本发明第一实施例的LED指示灯的结构图，图1（b）为正面方向的断面图，图1（a）为图1（b）所示断面形状椭园的短轴方向的侧面图，图1（c）为图1（b）所示断面形状椭园的长轴方向的侧面图;
图2为第二实施例的LED指示灯的结构图，图2（b）为正向断面图，图2（a）为图2（b）所示断面形状椭园的短轴方向的侧面图;
图3为表示第一实施例LED指示灯的混色性改善效果的特性说明图，特性A为相对于第一实施例的长宽比的混色区域，特性B为相对于第一实施例长宽比的正面光强度，特性C为相对于第二现有技术举例的长宽比的正面光强度，而图3（b）为说明混色区域的图示;
图4为第一现有技术举例的LED指示灯的结构图，图4（a）为侧面图，用4（b）为正向断面图;
图5为第二现有技术举例的LED指示灯的结构图，图5（a）为侧面图，图5（b）为正向断面图。
图中所示符号分别表示为：
1R  发红光半导体发光元件
1G  发绿光半导体发光元件
1B  发蓝光半导体发光元件
2  引线支架
3  金属连线
4  透光密封树脂外表
5R  半导体发光元件1R的发光区域
5G  半导体发光元件1G的发光区域
6  混色区域
Q  混色区域的角度

Claims (4)

1、LED指示灯，具有至少二色以上光的多个半导体发光元件，承载所述多个半导体发光元件的引线支架和包围所述多个半导体发光元件的透光密封树脂外表，其特征是：
所述密封树脂外表，与其所述多个半导体发光元件的连线相平行方向的曲率小于垂直方向的曲率。
2、如权利要求1所述的LED指示灯，其特性是：
所述密封树脂外表具有椭园体或椭园体一部分的形状，而且该椭园体的长轴大致上与所述多个半导体发光元件的连线相平行。
3、如权利要求1或2所述的LED指示灯，其特征是：
所述多个半导体发光元件，设置有包括发红光、绿光和蓝光的半导体发光元件的三个以上的半导体发光元件。
4、如权利要求1、2和3所述的LED指示灯，其特征是：
所述密封树脂外表，相对于所述多个半导体发光元件的连线，其平行方向的直径与垂直方向直径之比为1.2以上。
CN94108913A 1993-06-25 1994-06-24 发光二极管指示灯 Expired - Fee Related CN1062981C (zh)

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JP15517793A JP3420612B2 (ja) 1993-06-25 1993-06-25 Ｌｅｄランプ
JP155177/93 1993-06-25

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CN1102467A true CN1102467A (zh) 1995-05-10
CN1062981C CN1062981C (zh) 2001-03-07

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JPH0715043A (ja) 1995-01-17
US5841177A (en) 1998-11-24
CN1062981C (zh) 2001-03-07
JP3420612B2 (ja) 2003-06-30

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