| 摘要 |
PURPOSE:To make magnetic output and coercive force freely controllable and to improve operability by forming regularly arranged microholes on the surface of a photosensitive crystallized glass plate and packing magnetic powder into the microholes. CONSTITUTION:The photosensitive crystallized glass plate 1 is used as a carrier and the microholes 2 are regularly arranged and are bored to the surface thereof. The barium ferrite magnetic powder 3 of hexagonal plate shape is packed into the microholes 2. The microholes 2 are formed by imposing a mask having a pattern for the many regularly arranged holes with 0.1-0.2mum diameter and 0.2-0.3mum spacing between hole centers on the glass plate and executing transfer and heat treatment by a photographic method. This vertically magnetized film is formed by packing the magnetic powder 3 into such microholes and providing a protective layer to the upper part thereof. The disposition of the recording element is made free and the recording at a high density is made possible by the vertically magnetized film. The coercive force is freely selectable to 400-1,500Oe according to applications.
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