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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 k O8W>  
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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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Package:  white SMT package, colorless clear silicone resin clear silicone lens chip level conversion ?A\[EI^  
Typical Luminous Flux:  105 lm at 350 mA   fMSB  
Feature of the device:  high efficient lightsource at low space CEMe2~  
Color coordinates:  x = 0.31, y = 0.32 CIE 1931 (weiß)   ZR"BxE0_k  
Color temperature (typ.):  6500 K   !}$,) ~<+H  
Viewing angle at 50 % IV:  170°   {B d 0  
Technology:  ThinGaN     N:]Ud(VRM  
Typ. efficiency:  93 lm/W   .on}F>3k$  
Grouping parameter:  luminous flux color coordinates `VzjXJw  
soldering methods:  Reflow soldering 7z@Jw  
Preconditioning:  JEDEC Level 4 according to JEDEC S-STD-020-D   ^CtA@4  
Taping:  24 mm tape with 200/reel, Ø 180 mm   EWX!:BKf  
ESD-withstand voltage:  2 kV acc. to JESD22-A114-D %Q2<bj]  
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backlighting (illuminated advertising, general lighting) s<;kTReA  
reading lamps D$OUy}[2`.  
substitution of micro incandescent lamps P!*G"^0<  
indoor and outdoor commercial and residential architectural lighting )vcyoq  
display backlight where high brightness is required e.g. TFT hCX_^%  
decorative and entertainment lighting (incl. fiber optic illumination) 0Ia8x?80V  
signal and symbol luminaire FLE2]cL-  
marker lights (e.g. steps, exit ways, etc.) ra[*E4P9L*  
street lights JXa5snh{h  
tunnel lighting N)tqjq  
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