{HEAD ~ The apparatus} 1, wherein said light source unit has {TAIL ~ a ring shaped light source} 
{ HEAD ~ The apparatus } 1 , wherein said light source unit has { TAIL ~ a ring shaped light source }
HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL