Process for producing magnetic recording medium

Details Process for producing magnetic recording medium Process for producing magnetic recording medium

1997-07-16

1999-01-26

Vargot, Mathieu D.

Plastic and nonmetallic article shaping or treating: processes

Optical article shaping or treating

Light polarizing article or holographic article

264 137, 264400, G11B 584, B29D 1700

Patent

active

058634738

ABSTRACT:
A laser beam is focused onto a substrate for texturing the substrate surface to form a multiplicity of microscopic bumps thereon, wherein the laser beam to be focused is continuously modulated at an I.sub.max /I.sub.min ratio in the range from 10 to 100 wherein I.sub.max is the maximum amplitude of pulse oscillating laser beam output and I.sub.min is the minimum amplitude of pulse oscillating laser beam output, while the minimum output of the laser beam is controlled to a level lower than the minimum energy required for creating the microscopic bumps. A magnetic recording medium having good CSS characteristics can be produced at a high production rate from the laser-textured substrate.

REFERENCES:
patent: 3448458 (1969-06-01), Carlson et al.
patent: 4709417 (1987-11-01), Kuwabara
patent: 5062021 (1991-10-01), Ranjan et al.
patent: 5084856 (1992-01-01), Henmi et al.
patent: 5108781 (1992-04-01), Ranjan et al.
patent: 5279775 (1994-01-01), Thomas et al.
patent: 5582878 (1996-12-01), Ogawa et al.

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