Process for the production of a magnetic recording medium
AssigneeFuji Photo Film Co., Ltd.
InventorsRyuji Shirahata, Tatsuji Kitamoto
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Abstract
This invention relates to a process for the production of a magnetic recording medium, which comprises heating a substrate or subbing layer containing copper as a main component at a temperature of about 100.degree. to 350.degree. C. and, at the same time, vapor depositing in vacuum a ferromagnetic metal containing cobalt as a main component on the substrate or subbing layer to thus form a magnetic recording layer.
Claims8
A process for the production of a magnetic recording medium, which comprises heating a substrate or subbing layer having a thickness of at least 500 A containing at least 95% copper at a temperature of about 100.degree. to 350.degree. C. and, at the same time, vapor depositing at a vapor deposition speed of 0.03 to 3 .mu.m/min. in a vacuum of at most 10.sup.-4 Torr a ferromagnetic metal containing at least 70% by weight cobalt directly on the substrate or subbing layer to thus form a magnetic recording layer.
Dependencies are inferred from the claim text.