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US 4,514,937 AGranted
Method for the surface treatment of magnetic recording media
AssigneeBASF SE
InventorsManfred Gehrung, Klaus Schoettle, Helmut Kreissler, Peter Rudolf, Joachim Hack, Friedrich Anslinger
Life of this patent
Estimating the term…
Abstract
A method and apparatus for burnishing the surface of magnetic recording media, wherein there is relative movement between the surface to be burnished and the abrasive member, and the abrasive member is urged against the said surface, the pressure applied being increased over a period of time or at a plurality of locations, and then being reduced again.
Claims4
A method of treating the surface of magnetic recording media by burnishing, comprising:
- applying relative movement between the surface to be burnished and an abrasive member, pressing the abrasive member against the said surface, commencing with an unused portion of said abrasive member against a portion of said surface and controlling the pressure with which the said abrasive member portion is applied to said portion of said surface during the burnishing operation by burnishing at a lower burnishing pressure and then increasing from said one pressure up to a maximum burnishing pressure as the abrasive member portion in contact with the surface said portion of surface becomes loaded with abraded material from said surface and then reducing to less than the maximum pressure, and wherein the increase in the applied pressure occurs with a decrease in the abrasiveness of the abrasive member.
Dependencies are inferred from the claim text.