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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 1#d2 +J*  
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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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Feature of the device:  high efficient lightsource at low space Bp^LLH  
Color coordinates:  x = 0.31, y = 0.32 CIE 1931 (weiß)   wkp2A18n  
Color temperature (typ.):  6500 K   8jz>^.-o  
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Technology:  ThinGaN     kY]"3a  
Typ. efficiency:  93 lm/W   H:DR?'yW  
Grouping parameter:  luminous flux color coordinates ._rPM>B?  
soldering methods:  Reflow soldering ^% f8JoB  
Preconditioning:  JEDEC Level 4 according to JEDEC S-STD-020-D   ]+I9{%zB%8  
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reading lamps d|R-K7 ~~  
substitution of micro incandescent lamps cSPQ NYU:  
indoor and outdoor commercial and residential architectural lighting T~3{$  
display backlight where high brightness is required e.g. TFT if&bp ,  
decorative and entertainment lighting (incl. fiber optic illumination) z6`0Uv~  
signal and symbol luminaire i]MemM-  
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street lights `4K|L6  
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