MAGNETISCHER AUFZEICHNUNGSTRAEGER MIT BESONDERS DUENNER TOTALER DICKE.

摘要

A magnetic recording medium comprises a nonmagnetic film substrate 3.5 9 micrometres thick and having an F-5 value of not less than 20 kg/mm2 and a magnetic layer 1700-3000 Angstroms thick of ferromagnetic metal or alloy thin film. The substrate film is eg of aromatic polyamide resin film or polyethylene-2,6 naphthalate film. The magnetic layer is esp. of Co-Ni alloy deposited on the substrate by vacuum deposition in an inclined configuration. The recording materials have a very low overall thickness and are esp. useful in the prodn. of long-play video tape cassettes. Despite the extreme thinness of the tapes they have the same contact characteristics with the recording head as conventional thicker tapes and thus give equiv. outputs in use.