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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 gs$3)t  
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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 D5=C^`$2  
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Golden DRAGON Plus with silicone dome, ultra white, ThinGaN, chip level conversion, reflow solderable, lead (Pb) free – RoHS compliant ty':`)  
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Features fv:L\N1u  
Package:  white SMT package, colorless clear silicone resin clear silicone lens chip level conversion  }K?F7cD  
Typical Luminous Flux:  105 lm at 350 mA   wtlB  
Feature of the device:  high efficient lightsource at low space Xe)Pg)J1  
Color coordinates:  x = 0.31, y = 0.32 CIE 1931 (weiß)   pH^ z  
Color temperature (typ.):  6500 K   <|otZJ'2r  
Viewing angle at 50 % IV:  170°   XnD0eua#  
Technology:  ThinGaN     : g&>D#{  
Typ. efficiency:  93 lm/W   MdLj,1_T  
Grouping parameter:  luminous flux color coordinates *8/VSs  
soldering methods:  Reflow soldering V!mWn|lf  
Preconditioning:  JEDEC Level 4 according to JEDEC S-STD-020-D   #sL/y  
Taping:  24 mm tape with 200/reel, Ø 180 mm   'HCnB]1  
ESD-withstand voltage:  2 kV acc. to JESD22-A114-D S=4R5igrC  
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Applications .6LS+[  
flashlights ^mAJ[^%  
backlighting (illuminated advertising, general lighting) )q^(T1  
reading lamps STw oYn  
substitution of micro incandescent lamps %,XI]+d  
indoor and outdoor commercial and residential architectural lighting 1p~5h(jI  
display backlight where high brightness is required e.g. TFT bZu$0IG  
decorative and entertainment lighting (incl. fiber optic illumination) jBS'g{y-!  
signal and symbol luminaire <H!O:Mf_p  
marker lights (e.g. steps, exit ways, etc.) Mg+4huT  
street lights u9BjgK(M  
tunnel lighting xwi!:PAf,o  
ceiling light   HXyFj  
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