PURPOSE: To produce a magnetic recording medium of a metallic thin film type at a good yield by destaticizing the charges on the electrified magnetic recording medium on which a metallic thin film is formed.
CONSTITUTION: Gaseous oxygen is blown from a nozzle to the part of a substrate 3 where a magnetic metal 6 is deposited by evaporation, and the surface layer part of the magnetic thin film is forcibly oxidized at the time of forming the magnetic thin film. The substrate 3 passes the inside of a steam chamber 10 during the course that the substrate is subjected to the oxidation treatment and is taken up on a take-up side roll 2b. The charges are, therefore, destaticized by the steam in the steam chamber 10 even if the substrate 3 is electrified. There is no longer degradation in traveling characteristics by the electrification of the charges and the substrate 3 is well taken up from a supply side roll 2a through a cooling can 1 on the take-up side roll 2b. Since the traveling characteristic of the substrate 3 is good, the formation of the magnetic metallic thin film is well executed and the magnetic recording medium is obtd. at a good production yield.
YOSHIDA OSAMU
MIZUNOYA HIROHIDE
SHIGA AKIRA
