The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 27, 1990
Filed:
Nov. 02, 1989
Bruce P Kruger, Rochester, MN (US);
Thomas S Petersen, Rochester, MN (US);
International Business Machines Corporation, Armonk, NY (US);
Abstract
A magnetic disk is rotated while a tape of initially abrasive free permeable cloth tape is fed around a roller in engagement with a radial region of the disk surface. A slurry with free abrasive particles is applied to the tape prior to engagement of the tape with the disk. The roller is radially oscillated and the oscillation frequency is related to the disk rotation speed to abrade grooves in the disk surface in a pattern in which grooves vary from the circumferential direction by no more than a maximum angle of 5 to 45, preferably 8, degrees. The slurry application is halted and a rinse liquid is applied to the disk surface while the feeding of clean tape continues. Thin film layers including a magnetic medium are deposited on the abraded disk surface. The groove pattern may be abraded on the entire magnetizable area of the disk surface or may be restricted to the head landing area.