Slider for optical head

A slider for an optical head comprising:

• a slider member for running on a recording medium, during recording and/or reproduction for the recording medium, in a state floated over the recording medium or in a state contacted with said recording medium;
• an optical lens coupled to said slider member;
• and
• a magnetic coil buried in said slider member for encircling a focal point position of light incident from a side of the optical lens;
• said slider member being coupled to and optically unified to said optical lens so that a numerical aperture (NA) of an optical system made up of said slider member and said optical lens is not less than unity;
• a focal point plane of the light incident from the side of said optical lens being on a recording medium facing surface of said slider member.

A catadioptric lens system comprising:

• a) an optical head lens having a surface defining a circular concave exterior body portion, said circular surface adapted to refract light;
• a second concave surface having an annular shape adapted to reflect light, said annular surface defining an internal body portion of said lens, wherein said circular surface is radially disposed within, and co-axially aligned with, said annular second surface;
• b) a first internal reflection surface defined by said annular concave surface, and a second internal reflection surface surrounding a focal point, wherein said second reflection surface faces said first reflection surface, and reflects refracted light from said circular concave surface toward said first reflection surface, wherein said first reflection surface in turn reflects said light toward said focal point;
• and
• c) a slider including a top and bottom surface wherein said top surface is bonded to said optical head lens, and wherein said bottom surface defines a recording medium facing surface;
• said slider further including a focal plane spaced from said circular concave surface, said focal plane including a focal point adapted to collect evanescent light passed through said first and second concave surfaces, wherein said focal point is positioned within said slider at said recording medium facing surface.