However, in the present invention, since a point like focus was formed on an upper surface of the recording layer as described above, the geometrical size L2 on the medium surface, which is primarily determined by the dielectric substance, the transparent protective resin layer, the air gap and the structure of the SIL head, was taken as the diameter of {HEAD ~ the laser beams} on {TAIL ~ the medium surface} 
on
However , in the present invention , since a point like focus was formed on an upper surface of the recording layer as described above , the geometrical size L2 on the medium surface , which is primarily determined by the dielectric substance , the transparent protective resin layer , the air gap and the structure of the SIL head , was taken as the diameter of { HEAD ~ the laser beams } on { TAIL ~ the medium surface }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL