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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 O<`N0  
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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 l+#uQo6cqQ  
Typical Luminous Flux:  105 lm at 350 mA   4*&2D-8<K  
Feature of the device:  high efficient lightsource at low space #|QA_5  
Color coordinates:  x = 0.31, y = 0.32 CIE 1931 (weiß)   U?xa^QVhj  
Color temperature (typ.):  6500 K   MMy\u) 4  
Viewing angle at 50 % IV:  170°   Ly-}HW(  
Technology:  ThinGaN     NydF'N_1  
Typ. efficiency:  93 lm/W   O %1uBc  
Grouping parameter:  luminous flux color coordinates }vEMG-sxX  
soldering methods:  Reflow soldering u\3=m%1  
Preconditioning:  JEDEC Level 4 according to JEDEC S-STD-020-D   6Qn};tbnD  
Taping:  24 mm tape with 200/reel, Ø 180 mm   9>6?tb"f*H  
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backlighting (illuminated advertising, general lighting) KjK-#F,@  
reading lamps $#-O^0D  
substitution of micro incandescent lamps 5i-VnG  
indoor and outdoor commercial and residential architectural lighting (H;,E-  
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decorative and entertainment lighting (incl. fiber optic illumination) Zg3 /,:1  
signal and symbol luminaire VKcVwq  
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