Magnetic recording medium and process for producing same

Details Magnetic recording medium and process for producing same Magnetic recording medium and process for producing same

1999-06-10

2000-10-17

Vargot, Mathieu D.

Plastic and nonmetallic article shaping or treating: processes

Optical article shaping or treating

Light polarizing article or holographic article

21912169, 264 137, 264400, 4251744, 425810, G11B 582, B29D 1700

Patent

active

061326518

ABSTRACT:
A magnetic recording medium having a substrate disc with microscopic bumps formed by focusing a laser beam, wherein spacings D between adjacent bumps in the circumferential direction of the disc are varied so that formula (1) is satisfied:

REFERENCES:
patent: 5062021 (1991-10-01), Ranjan et al.
patent: 5567484 (1996-10-01), Baumgart et al.
patent: 5595768 (1997-01-01), Treves et al.
patent: 5595791 (1997-01-01), Baumgart et al.
patent: 5783797 (1998-07-01), Xuan et al.
patent: 5863473 (1999-01-01), Ohsawa et al.
patent: 6004487 (1999-12-01), Wada et al.

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