EP0083753A2
Expired / Lapsed
EP
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Apparatus and method for burnishing magnetic disks
Assignee: International Business Machines Corp
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Filing: 1982-12-14
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Granted: —
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Expires: 2002-12-14
Abstract
Abstract The burnishing tool has a plurality of holes (41) in the planar surface (40) which engages the flexible magnetic disk (4). Each hole contains a burnishing blade (42) positioned at 45° to the direction of motion. A manifold (20) connects each hole to a vacuum pump which draws air into the holes causing the flexible magnetic disk to fly against the planar surface. The vacuum also removes the debris from the burnishing tool.
Inventors
- 👤 Randy Joseph Bornhorst
- 👤 Arlen John Bowen
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-02 13:24
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/84; B; B24; B24B; B24B39/00; B24B39/06; Y; Y10; Y10T; Y10T29/00; Y10T29/47
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
148 words
Apparatus for finishing the surface of a flexible magnetic disk (4) characterized in that it comprises : first drive means (10) for rotating said flexible disk about a first axis (2) perpendicular to the plane of said disk, a manifold (20) rotatable about a second axis (23) parallel to and spaced from said first axis, said manifold having a planar surface (40) perpendicular to said second axis, a plurality of openings (41) in said planar surface a burnishing blade (42) mounted in at least one of said openings with a blade edge positioned substantially coplanar with said manifold planar surface, the ends of said blade edge being spaced from the wall of said openings, means (30, 31, 32) for applying a vacuum to said manifold to draw a flexible disk toward said manifold planar surface, and second drive means (25) for rotating said manifold about said second axis.
Claim 2
Dependent Claim
148 words
Apparatus for finishing the surface of a flexible magnetic disk (4) characterized in that it comprises : first drive means (10) for rotating said flexible disk about a first axis (2) perpendicular to the plane of said disk, a manifold (20) rotatable about a second axis (23) parallel to and spaced from said first axis, said manifold having a planar surface (40) perpendicular to said second axis, a plurality of openings (41) in said planar surface a burnishing blade (42) mounted in at least one of said openings with a blade edge positioned substantially coplanar with said manifold planar surface, the ends of said blade edge being spaced from the wall of said openings, means (30, 31, 32) for applying a vacuum to said manifold to draw a flexible disk toward said manifold planar surface, and second drive means (25) for rotating said manifold about said second axis.
Claim 3
Dependent Claim
45 words
Apparatus according to Claim 1 characterized in that it further includes : means for controlling the speed of said first and second drive means (10, 25) to cause the rotational speed of said manifold (20) to differ from the rotational speed of said disk (4).
Claim 4
Dependent Claim
36 words
Apparatus according to Claim 2 characterized in that : the rotational speed of said manifold (20) is 1650 RPM + 2 RPM and the rotational speed of said disk (4) is 1658 RPM + 2 RPM.
Claim 5
Dependent Claim
31 words
Apparatus according to any one of Claims 1-3 characterized in that : the diameter of said planar surface (40) is greater than the radial length of the area to be burnished.
Claim 6
Dependent Claim
25 words
Apparatus according any one of Claims 1-4 characterized in that : the distance between said first and second axes (2, 23) remains constant during burnishing.
Claim 7
Dependent Claim
23 words
Apparatus according to any one of Claims 1-5 characterized in that : said openings (41) are arranged equidistant from said second axes (23).
Claim 8
Dependent Claim
29 words
Apparatus according to any one of Claims 1-6 characterized in that : the area of said openings (41) is approximately 33% of the area of said planar surface (40).
Claim 9
Dependent Claim
26 words
Apparatus according to any one of Claims 1-7 characterized in that : the gauge vacuum within said manifold (20) during operation is 3x10 4 Pa (±0,3).
Claim 10
Dependent Claim
19 words
A process for treating the surface of a flexible magnetic disk characterized in that it comprises the steps of:
Claim 11
Dependent Claim
19 words
A process for treating the surface of a flexible magnetic disk characterized in that it comprises the steps of:
Claim 12
Dependent Claim
7 words
Rotating the disk at a first speed,
Claim 13
Dependent Claim
7 words
Rotating the disk at a first speed,
Claim 14
Dependent Claim
18 words
Rotating a manifold, having burnishing blades positioned in holes in a planar surface, at a second, different speed,
Claim 15
Dependent Claim
18 words
Rotating a manifold, having burnishing blades positioned in holes in a planar surface, at a second, different speed,
Claim 16
Dependent Claim
21 words
Applying a vacuum to said manifold to cause said disk to fly against said planar surface and engage said burnishing blades,
Claim 17
Dependent Claim
21 words
Applying a vacuum to said manifold to cause said disk to fly against said planar surface and engage said burnishing blades,
Claim 18
Dependent Claim
16 words
Discharging said vacuum to disengage said disk from said manifold surface when the treatment is complete.
Claim 19
Dependent Claim
16 words
Discharging said vacuum to disengage said disk from said manifold surface when the treatment is complete.
Claim 20
Dependent Claim
23 words
A process according to Claim ( characterized in that : step 3 lasts at least 2 seconds and not more than 5 seconds.
Claim 21
Dependent Claim
18 words
A flexible magnetic disk characterized in that it treated according to the process of claim 9 or 10.
References Cited (Backward Citations)
No citation records indexed.
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