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 {HEAD ~ the medium surface}, which is primarily determined by the dielectric substance, the transparent protective resin layer, {TAIL ~ the air gap} and the structure of the SIL head, was taken as the diameter of the laser beams on the medium surface 
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 { HEAD ~ the medium surface } , which is primarily determined by the dielectric substance , the transparent protective resin layer , { TAIL ~ the air gap } and the structure of the SIL head , was taken as the diameter of the laser beams on the medium surface
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