US4973496A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for texturing magnetic disks
Assignee: International Business Machines Corp
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Filing: 1989-11-02
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Granted: 1990-11-27
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Expires: 2009-11-02
Abstract
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.
Inventors
- 👤 Bruce P. Kruger
- 👤 Thomas S. Petersen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 15:57
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/84; G11B5/8404; Y; Y10; Y10S; Y10S428/00; Y10S428/90
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
120 words
A method for texturing the surface of a magnetic disk comprising the steps of: rotating the disk around its axis; adavncing a roller which rotates about an axis substantially parallel to the surface of the disk and about which is trained a porous material across a portion of the surface of the rotating disk; holding the porous material against the disk surface; oscillating the roller and porous material in a radial direction relative to the disk surface in the region where the porous material is pressed against the disk surface; and delivering a slurry containing free abrasive particles and a slurry liquid to the region between the porous material and the disk surface in order to abrade the disk surface.
Claim 2
Independent Claim
120 words
A method for texturing the surface of a magnetic disk comprising the steps of: rotating the disk around its axis; adavncing a roller which rotates about an axis substantially parallel to the surface of the disk and about which is trained a porous material across a portion of the surface of the rotating disk; holding the porous material against the disk surface; oscillating the roller and porous material in a radial direction relative to the disk surface in the region where the porous material is pressed against the disk surface; and delivering a slurry containing free abrasive particles and a slurry liquid to the region between the porous material and the disk surface in order to abrade the disk surface.
Claim 3
Dependent Claim
33 words
The method of claim 1 wherein said step of advancing the roller includes advancing a tape of nonabrasive porous material which is trained over the roller surface in contact with the disk surface.
Claim 4
Dependent Claim
23 words
The method of claim 1 wherein said advancing, holding, oscillating and delivering steps are performed simultaneously on both opposed surfaces of the disk.
Claim 5
Dependent Claim
25 words
The method of claim 2 wherein said pressing step includes continuously feeding the tape around a roller and pressing the roller against the disk surface.
Claim 6
Dependent Claim
23 words
The method of claim 4 wherein said advancing, holding, oscillating and delivering steps are performed simultaneously on both opposed surfaces of the disk.
Claim 7
Dependent Claim
63 words
The method of claim 2 wherein said oscillating step includes varying the radial speed of the tape in a sinusoidal manner, and relating the frequency of radial oscillation to the speed of disk rotation in order to limit the maximum movement of the tape relative to the disk surface to the range of about five degrees to forty-five degrees from the circumferential direction.
Claim 8
Dependent Claim
45 words
The method of claim 6 wherein said oscillating step includes relating the frequency of radial oscillation to the speed of disk rotation in order to limit the maximum movement of the tape relative to the disk surface to about eight degrees from the circumferential direction.
Claim 9
Dependent Claim
29 words
The method of claim 2 wherein said holding step comprises holding the tape against a radially oriented region intersecting substantially all of the magnetizable area of the disk surface.
Claim 10
Dependent Claim
41 words
The method of claim 2 wherein said holding step comprises holding the tape against a radially oriented region intersecting only a portion of the magnetizable area of the disk surface in order to abrade a radial band within the magnetizable area.
Claim 11
Dependent Claim
26 words
The method of claim 1 further comprising discontinuing the delivery of slurry while continuing said rotating and advancing steps, and rinsing the surface of the disk.
Claim 12
Dependent Claim
32 words
The method of claim 10 said delivering step including delivering a slurry including a water soluble lubricant and said rinsing step including applying to the disk surface a rinse liquid including water.
Claim 13
Dependent Claim
20 words
The method of claim 1 further comprising depositing thin film layers including a magnetic medium onto the abraided disk surface.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-11-26 | 1994-05-28 | 1994-11-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-11-26 | 1998-05-28 | 1998-11-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-11-26 | 2002-05-28 | 2002-11-27 | $7700.00 | Window Closed / Lapsed |