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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 j 7:r8? G  
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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=T;hk  
Typical Luminous Flux:  105 lm at 350 mA   />8A?+g9u  
Feature of the device:  high efficient lightsource at low space jyF*JQjK4  
Color coordinates:  x = 0.31, y = 0.32 CIE 1931 (weiß)   ORP<?SG55u  
Color temperature (typ.):  6500 K   h4K Mhr  
Viewing angle at 50 % IV:  170°   XRkUv>Yk  
Technology:  ThinGaN     Kv1~,j6  
Typ. efficiency:  93 lm/W   2`;XcY4A  
Grouping parameter:  luminous flux color coordinates ^1c7\"{  
soldering methods:  Reflow soldering mE{QTZS  
Preconditioning:  JEDEC Level 4 according to JEDEC S-STD-020-D   'l!\2Wv2  
Taping:  24 mm tape with 200/reel, Ø 180 mm   >Q(\vl@N=  
ESD-withstand voltage:  2 kV acc. to JESD22-A114-D s&o9LdL  
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Applications 4?@#w>(  
flashlights uSI@Cjp  
backlighting (illuminated advertising, general lighting) PX^ k;  
reading lamps rxol7"2l  
substitution of micro incandescent lamps F[O147&C  
indoor and outdoor commercial and residential architectural lighting tvVf)bbz  
display backlight where high brightness is required e.g. TFT _~CJitR3  
decorative and entertainment lighting (incl. fiber optic illumination) 9&zR i  
signal and symbol luminaire gn/]1NNfR  
marker lights (e.g. steps, exit ways, etc.) bG"FN/vg  
street lights 3k>#z%//  
tunnel lighting $ e L-fg  
ceiling light   KK >j V  
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