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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 +*WE<4"!6  
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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 'm# -)R!  
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Feature of the device:  high efficient lightsource at low space .r)WDR  
Color coordinates:  x = 0.31, y = 0.32 CIE 1931 (weiß)   XtRfzqg?K  
Color temperature (typ.):  6500 K   w:I^iI .  
Viewing angle at 50 % IV:  170°   Ih!UL:Ckh  
Technology:  ThinGaN      wa6DJ  
Typ. efficiency:  93 lm/W   XL_X0(AKf  
Grouping parameter:  luminous flux color coordinates -N(y+~wN  
soldering methods:  Reflow soldering , d ?4"8_  
Preconditioning:  JEDEC Level 4 according to JEDEC S-STD-020-D   -iGt]mbJkP  
Taping:  24 mm tape with 200/reel, Ø 180 mm   EJO:3aKa  
ESD-withstand voltage:  2 kV acc. to JESD22-A114-D -wtavv,J  
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flashlights 2w)0>Y(_  
backlighting (illuminated advertising, general lighting) "\Jq2vM  
reading lamps 64z9Yr@  
substitution of micro incandescent lamps wxB?}   
indoor and outdoor commercial and residential architectural lighting Qf0$Z.-  
display backlight where high brightness is required e.g. TFT SE)_5|k*  
decorative and entertainment lighting (incl. fiber optic illumination) T5)Xl'Q  
signal and symbol luminaire {H#1wu^]O$  
marker lights (e.g. steps, exit ways, etc.) 2/sD#vC  
street lights 8N4W}YBs  
tunnel lighting C_dsYuQ5R  
ceiling light   GeWB"(t  
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