| http://www.w3.org/ns/prov#value | - FIG. 2A is a detailed diagram illustrating the upper plate 10 of the optical recording media in FIG. 1A. A metal coating layer 50 consisting of aluminum or its alloy is provided at one side of the PM 51 in order to make a narrow beam spot only on the aperture region from the laser light incident from an upper portion of the upper plate 10.
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