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Burnishing Method and Apparatus for Flexible Magnetic Disks

IP.com Disclosure Number: IPCOM000087760D
Original Publication Date: 1977-Mar-01
Included in the Prior Art Database: 2005-Mar-03
Document File: 2 page(s) / 50K

Publishing Venue

IBM

Related People

Slindee, NE: AUTHOR

Abstract

This apparatus includes a round knife-edged burnishing tool 10 which is drivably rotated in contact with the lower magnetic surface of a flexible magnetic disk 12, as disk 12 is rotated above a flat Bernoulli plate 14 (Fig. 1).

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Burnishing Method and Apparatus for Flexible Magnetic Disks

This apparatus includes a round knife-edged burnishing tool 10 which is drivably rotated in contact with the lower magnetic surface of a flexible magnetic disk 12, as disk 12 is rotated above a flat Bernoulli plate 14 (Fig. 1).

Disk 12 is fixed to spindle 16 and is rotatably driven by motor 18 through spindle 16 (Fig. 2). Spindle 16 holds disk 12 spaced just slightly above the surface of flat Bernoulli plate 14, and disk 12 floats above the surface of plate 14, due to the flow of air in direction A upwardly along spindle 16 and outwardly between the under surface of disk 12 and the upper surface of plate 14. Burnishing tool 10 is rotatably driven by motor 20 at the same time as disk 12 spins above the surface of plate 14. Burnishing tool 10 has a circular knife edge 22 bounding a cavity 24 in the upper surface of burnishing tool 10 (Fig. 3).

Due apparently to the flow of air in direction B outwardly of the cavity 24 as the burnishing tool is rotated by motor 20, flexible disk 12 is sucked down onto tool 10 and the circular form of knife edge 22 is clearly visible in the upper surface of disk 12. Disk 12 is thus in contact with knife edge 22 due to the suction provided by tool 10 on disk 12, and the lower magnetic surface of disk 12 is thus burnished so as to thereby remove any high spots or bumps from the magnetic coating on the lower surface of disk 12, and thus provide a smooth uniform surface of disk...