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famen 2009-06-21 10:09

LED的发散角

请问LED的参数中viewing angle是什么意思?是它内部的反光碗的发散角吗?
我是菜鸟 2009-06-21 11:37
不是吧
famen 2009-06-21 12:20
那应该怎么取值呀?从产品参数中找不到呀
famen 2009-06-21 12:21
有没有固定的值呀?
bluepeter 2009-06-22 18:48
光强极值50%到中心之间夹角的2倍,即为viewing angle
bililly 2009-06-22 19:36
4楼说得有理,通常取50%时的角度,而LED规格书也是注明发散角的角度也是在50%
bililly 2009-06-22 19:41
附件为常见LED规格书中关于视角的示意
bluepeter 2009-06-23 12:04
倘若LED封装无透镜设计的话,那么辐射体为朗伯体,其全视角(viewing angle)为120度 FBNi (D  
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加了透镜的话,就要看规格书了
bluepeter 2009-06-23 12:53
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Features GF9iK|i/  
Package:  white SMT package, colorless clear silicone resin clear silicone lens chip level conversion >CCy2W^W  
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Feature of the device:  high efficient lightsource at low space _u-tRHh|A  
Color coordinates:  x = 0.31, y = 0.32 CIE 1931 (weiß)   v 'L"sgW6I  
Color temperature (typ.):  6500 K   SFWS<H(IN  
Viewing angle at 50 % IV:  170°   /L,iF?7  
Technology:  ThinGaN     L_Z`UhD3{  
Typ. efficiency:  93 lm/W   =]Y'xzJuu  
Grouping parameter:  luminous flux color coordinates R "W=V  
soldering methods:  Reflow soldering Pd:tRY+t/  
Preconditioning:  JEDEC Level 4 according to JEDEC S-STD-020-D   s/?(G L+Ae  
Taping:  24 mm tape with 200/reel, Ø 180 mm   I-s$U T[p  
ESD-withstand voltage:  2 kV acc. to JESD22-A114-D Mn\L55?E(  
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reading lamps DKQQZ` PF  
substitution of micro incandescent lamps ~}YgZ/U7T  
indoor and outdoor commercial and residential architectural lighting .R+n}>+K  
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decorative and entertainment lighting (incl. fiber optic illumination) K<ldl.  
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marker lights (e.g. steps, exit ways, etc.) #"-w;T%b  
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tunnel lighting \LS s@\$ g  
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