| 摘要 |
PURPOSE:To improve thermal dimensional stability, to obviate the generation of wrinkling in a stage for sputtering and ion plating and to permit an increase of the temp. of a can and processing speed by using a nonmagnetic substrate consisting of a biaxially oriented PEN film. CONSTITUTION:This medium is constituted by forming a vertically magnetized film on the nonmagnetic substrate consisting of the biaxially oriented PE-2, 6-naphthalene dicarboxylate film. The PE naphthalate refers to a PE-2, 6-naphthalene dicarboxylate (PEN) homopolymer, copolymer contg. 70wt% other isomer polymer and PEN, mixture composed thereof and includes a polyester compsn., etc. which do not substantially lose the nature of the PE-2, 6-naphthalene dicarboxylate. This nonmagnetic substrate has preferably <=0.008mum surface roughness.
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