Manufacture of magnetic recording medium

Abstract

Abstract PURPOSE:To form a uniform and excellent thin metallic ferromagnetic film by discharging a base at least either before or after the thin metallic ferromagnetic film is formed. CONSTITUTION:A nonmagnetic base 2 unwound from a supply reel 1 is passed between counter electrodes 6 applied with an about 750V/cm electric field in the 1st bombardment chamber 3 wherein an ionizable gaseous atmosphere is produced to carry out a surface activating treatment for increasing the sticking strength of ferromagnetic metallic powder, and it is passed between counter electrodes 11 applied with an about 100-250V/cm electric field in the 2nd bombardment chamber 9 having similar constitution for removing charges generated in the 1st bombardment chamber. Then, while the base 2 treated by discharging is mede run along a cooling drum 15, a ferromagnetic metal is vacuum-deposited by using a vapor deposition source 19 and after the base is passed in the 3rd bombardment chamber having similar constitution to the 2nd chamber for removing the charges on the base during the vacuum deposition, the base is wound around a take-up reel 29.

Inventors

• 👤 Takahiro Kawana
• 👤 隆宏 川名
• 👤 Yasuyoshi Kudo
• 👤 工藤　康義
• 👤 Kazunori Ozawa
• 👤 和典 小沢

Bibliographic Details