| 摘要 |
PROBLEM TO BE SOLVED: To provide a substrate of a magnetic recording medium and a magnetic recording medium that have superior head floating properties. SOLUTION: In the manufacturing methods for the base plate of the magnetic recording medium, which has a resin injection step of injecting and filling a thermoplastic resin to a metal die through the gate, and a cutoff step for cutting off the resin remaining near the gate after the resin injection step, the manufacturing method has the cutoff step has a cylindrical punch, which has a cutting blade at the tip to cut the resin remaining near the gate and is positioned on the metal die to move relative to the die along the center line of the disc and cuts off the resin, using the punch by leaving the resin to be 0.3 to 3 mm in thickness. COPYRIGHT: (C)2003,JPO |
