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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 25>R^2,LiE  
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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 |A&;m}(Mt  
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Features ]8A*uyi  
Package:  white SMT package, colorless clear silicone resin clear silicone lens chip level conversion g,,wG k  
Typical Luminous Flux:  105 lm at 350 mA   }UPC~kC+Z  
Feature of the device:  high efficient lightsource at low space KqI:g*H'x7  
Color coordinates:  x = 0.31, y = 0.32 CIE 1931 (weiß)   l7-lXl"%q  
Color temperature (typ.):  6500 K    2%@tnk|@  
Viewing angle at 50 % IV:  170°   +|/0sPW(  
Technology:  ThinGaN     #W~jQ5NS\  
Typ. efficiency:  93 lm/W   Ci`o;KVj  
Grouping parameter:  luminous flux color coordinates Oiib2Ov  
soldering methods:  Reflow soldering 8T1`9ITl:  
Preconditioning:  JEDEC Level 4 according to JEDEC S-STD-020-D   Ohm{m^VD"  
Taping:  24 mm tape with 200/reel, Ø 180 mm   a_b#hM/c;  
ESD-withstand voltage:  2 kV acc. to JESD22-A114-D 6 f*:;  
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Applications iT'doF  
flashlights 7O55mc>cF  
backlighting (illuminated advertising, general lighting) #Z1%XCt  
reading lamps . 1kB8&}  
substitution of micro incandescent lamps }O\IF}X  
indoor and outdoor commercial and residential architectural lighting /43l}6I  
display backlight where high brightness is required e.g. TFT ,`f]mv l  
decorative and entertainment lighting (incl. fiber optic illumination) 71{Q#%5U~  
signal and symbol luminaire $gr>Y2i  
marker lights (e.g. steps, exit ways, etc.) (OiV IH  
street lights O>L,G)g  
tunnel lighting f&<+45JI  
ceiling light   v]EMJm6d|  
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