Method for fabricating magnetic recording medium

Details Method for fabricating magnetic recording medium Method for fabricating magnetic recording medium

1991-09-16

1993-08-03

Pianalto, Bernard

Coating processes

Direct application of electrical, magnetic, wave, or...

Pretreatment of substrate or post-treatment of coated substrate

2041921, 427128, 427129, 427131, 427132, 427600, 428 64, 428695, B05D 312

Patent

active

052327507

ABSTRACT:
A surface of a non-magnetic base plate is first coarsened to a required surface roughness and an ultrasonic vibration is then applied to the surface of the non-magnetic base plate while the non-magnetic base plate is immersed in a liquid. Thereafter, a magnetic recording layer and a protective layer are successively formed on the surface of the non-magnetic base plate thereby to produce a magnetic recording medium. It is preferable that the frequency of a ultrasonic vibration is within a range from 200 kHz to 1600 kHz. Surface fractional properties of the magnetic recording medium can adequately be controlled without variation of the floatation height of a magnetic head during its running by varying an ultrasonic oscillation output and an ultrasonic processing time.

REFERENCES:
patent: 3297418 (1967-01-01), Firestone

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