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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 L*9^-,  
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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 g||{Qmr=1  
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Feature of the device:  high efficient lightsource at low space X_|8CD-@6  
Color coordinates:  x = 0.31, y = 0.32 CIE 1931 (weiß)   |v}"UW(y  
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Viewing angle at 50 % IV:  170°   8^$}!9B~JZ  
Technology:  ThinGaN     ._=Pa)T  
Typ. efficiency:  93 lm/W   a |32Pn  
Grouping parameter:  luminous flux color coordinates Q}W6?XDu  
soldering methods:  Reflow soldering /+P 4cHv]F  
Preconditioning:  JEDEC Level 4 according to JEDEC S-STD-020-D   Uq~{=hMX  
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ESD-withstand voltage:  2 kV acc. to JESD22-A114-D T%KZV/  
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reading lamps wQ*vcbQX*  
substitution of micro incandescent lamps Jj|HeZ1C f  
indoor and outdoor commercial and residential architectural lighting ,`G8U/  
display backlight where high brightness is required e.g. TFT R"Hhc(H  
decorative and entertainment lighting (incl. fiber optic illumination) /Bid:@R  
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marker lights (e.g. steps, exit ways, etc.) K/+5$SjF  
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