{TAIL ~ The diffuser plate} 4 has the function of emitting light source light diffusingly in {HEAD ~ a predetermined angular range} 
{ TAIL ~ The diffuser plate } 4 has the function of emitting light source light diffusingly in { HEAD ~ a predetermined angular range }
TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD