Abstract
The requirements for optical tapes in an optical tape recording system using a rotating optical head are presented. Along with the requirements, the best structure for a magnet-optical (MO) tape was studied. As a result, a tri-layer structure was adopted for easy production and the tri-layerd MO tapes were experimentally fabricated. Performances and problems of an MO tape were experimentally investigated using these samples. And, the following results were obtained which realized performances equal to an optical disk using a thin polyethylene terephthalate (PET) substrate. (1) The incidence of the laser is from the tri-layer side to avoid the birefringence of the PET substrate. (2) Surface roughness of the PET substrate is below Ra = 7 nm. (3) Heat-resistance of PET substrate makes recording or erasing operations in excess of ten thousand times possible. (4) MO tape (width: 1/2 inch, thickness: 10 μm) was stable in terms of optical and magnetic properties under a tape tension of 0.5 kgw. (5) Sufficient tape tension is necessary to satisfy the requirement of flatness since MO tape has a large extent of curling.
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