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