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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 >4VU  
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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 5ya3mN E  
http://catalog.osram-os.com/catalogue/catalogue.do?favOid=0000000200005c3a038f0023&act=showBookmark I[`2MKh  
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Golden DRAGON Plus with silicone dome, ultra white, ThinGaN, chip level conversion, reflow solderable, lead (Pb) free – RoHS compliant v-gT 3kJ  
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Features "@?|Vv,vn  
Package:  white SMT package, colorless clear silicone resin clear silicone lens chip level conversion e>>G4g  
Typical Luminous Flux:  105 lm at 350 mA   otIJ[Mvyq  
Feature of the device:  high efficient lightsource at low space ^hHeH:@  
Color coordinates:  x = 0.31, y = 0.32 CIE 1931 (weiß)   0B4(t6o  
Color temperature (typ.):  6500 K   Hb+#*42v  
Viewing angle at 50 % IV:  170°   #-Rz`Y<&  
Technology:  ThinGaN     d-<y'GYw  
Typ. efficiency:  93 lm/W   )f!dG(\&#  
Grouping parameter:  luminous flux color coordinates 6uXW`/lvX  
soldering methods:  Reflow soldering IX*S:7S[  
Preconditioning:  JEDEC Level 4 according to JEDEC S-STD-020-D   CU;nrd"  
Taping:  24 mm tape with 200/reel, Ø 180 mm   r:5Ve&~  
ESD-withstand voltage:  2 kV acc. to JESD22-A114-D g Oj5c  
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Applications by U\I5  
flashlights _tReZ(Vw  
backlighting (illuminated advertising, general lighting) oGVSy`ku  
reading lamps $.N~AA~0  
substitution of micro incandescent lamps ; BZM~ '  
indoor and outdoor commercial and residential architectural lighting L_|uB  
display backlight where high brightness is required e.g. TFT P{Z71a5  
decorative and entertainment lighting (incl. fiber optic illumination) # VV.[ N  
signal and symbol luminaire WhZaq  
marker lights (e.g. steps, exit ways, etc.) ^!<7#kX  
street lights T"H )g  
tunnel lighting I PVzV\o  
ceiling light   8T)zB6ng  
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