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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 W,@ F!8  
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加了透镜的话,就要看规格书了
bluepeter 2009-06-23 12:53
OSRAM OS Golden Dragon Plus Datasheet Y$L` G  
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Package:  white SMT package, colorless clear silicone resin clear silicone lens chip level conversion sYS 8]JU  
Typical Luminous Flux:  105 lm at 350 mA   \( s `=(t  
Feature of the device:  high efficient lightsource at low space @l CG)Ix<  
Color coordinates:  x = 0.31, y = 0.32 CIE 1931 (weiß)   I:jIChT  
Color temperature (typ.):  6500 K   c6[m'cy  
Viewing angle at 50 % IV:  170°   NIQ}A-b  
Technology:  ThinGaN     @SD XJJ h  
Typ. efficiency:  93 lm/W   Rmw=~NP5  
Grouping parameter:  luminous flux color coordinates Ve(<s  
soldering methods:  Reflow soldering |1%% c %  
Preconditioning:  JEDEC Level 4 according to JEDEC S-STD-020-D   fo,0NxF9  
Taping:  24 mm tape with 200/reel, Ø 180 mm   iLnW5yy  
ESD-withstand voltage:  2 kV acc. to JESD22-A114-D ?V2P]|  
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Applications MUl`0H"tR  
flashlights ''9]`B,:a0  
backlighting (illuminated advertising, general lighting) wG)e8,#  
reading lamps k)3N0]q6  
substitution of micro incandescent lamps O H>.N"IG  
indoor and outdoor commercial and residential architectural lighting yc*cT%?g  
display backlight where high brightness is required e.g. TFT f4p*!e  
decorative and entertainment lighting (incl. fiber optic illumination) 'KjH|u  
signal and symbol luminaire ^P9mJ:  
marker lights (e.g. steps, exit ways, etc.) %O9Wm_%  
street lights Qp<*o r@  
tunnel lighting -Hm"Dx  
ceiling light   )"\= _E#  
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