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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 ru/zLj:  
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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 3cfZ!E~^kc  
http://catalog.osram-os.com/catalogue/catalogue.do?favOid=0000000200005c3a038f0023&act=showBookmark 3TiXYH  
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Golden DRAGON Plus with silicone dome, ultra white, ThinGaN, chip level conversion, reflow solderable, lead (Pb) free – RoHS compliant 0|s$vqc  
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Features xeYySM=  
Package:  white SMT package, colorless clear silicone resin clear silicone lens chip level conversion hw ;dm  
Typical Luminous Flux:  105 lm at 350 mA   s/G5wRl<  
Feature of the device:  high efficient lightsource at low space 9S H<d)^  
Color coordinates:  x = 0.31, y = 0.32 CIE 1931 (weiß)   bpF@}#fT  
Color temperature (typ.):  6500 K   0^!,[oh6*  
Viewing angle at 50 % IV:  170°   O5TK&j  
Technology:  ThinGaN     vQBY1-S  
Typ. efficiency:  93 lm/W   1Fvv/Tj  
Grouping parameter:  luminous flux color coordinates /2_B$  
soldering methods:  Reflow soldering }U?gKlLg  
Preconditioning:  JEDEC Level 4 according to JEDEC S-STD-020-D   8 g# Y  
Taping:  24 mm tape with 200/reel, Ø 180 mm   N}+B:l]Qy  
ESD-withstand voltage:  2 kV acc. to JESD22-A114-D SJ@8[n.x  
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Applications f^6&Fb>  
flashlights 2yJ7]+Jd7Y  
backlighting (illuminated advertising, general lighting) A| gs Uh  
reading lamps r\l3_t  
substitution of micro incandescent lamps dEQReD  
indoor and outdoor commercial and residential architectural lighting ,WO%L~db  
display backlight where high brightness is required e.g. TFT f $.\o  
decorative and entertainment lighting (incl. fiber optic illumination) C NzSBm  
signal and symbol luminaire >uyeI&z  
marker lights (e.g. steps, exit ways, etc.) 5&n988g C8  
street lights (EOec5qXU  
tunnel lighting c ?p0#3%L#  
ceiling light   %/tGkS6  
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