Oblon, Spivak, McClelland, Maier & Neustadt, P.C.
Optical recording/reproducing apparatus, optical rotating recording medium, and method of designing optical recording/reproducing apparatus
An optical recording/reproducing apparatus accessing a recording layer of an optical rotating recording medium using an accessing means positioned a predetermined gap away from a surface of said optical rotating recording medium and mounted with an object lens, wherein a thickness of a protective transparent layer of said optical rotating recording medium, a ratio of a defect area with respect to a beam spot area, and the above predetermined gap are values determined by the conditions defined in the following inequalities: or where,G: gap separating accessing means from surface of optical rotating recording medium,t: thickness of transparent layer positioned at surface of recording medium of optical rotating recording medium,n: refractive index of transparent layer, andNA: numerical aperture of optical system including object lens.
Sony Corporation
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Tetsu
Watanabe