Method for fabricating magnetic recording medium
US5232750A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 16, 1991 |
| Grant date | Aug 3, 1993 |
| Priority date | — |
| Expiry date | Sep 16, 2011 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B5/8404
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.