US5741560A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for preparing a substrate for a magnetic disk
Assignee: WD Media LLC
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Filing: 1996-11-05
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Granted: 1998-04-21
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Expires: 2016-11-05
Abstract
Abstract A method for manufacturing a magnetic disk comprises the step of depositing a metallic layer on a glass substrate and laser texturing the metallic layer. The magnetic disk is then completed by deposition of (a) an underlayer such as Cr or sputtered NiP, (b) a magnetic layer such as a Co or Fe alloy, and (c) a protective overcoat such as ZrO 2 , carbon or hydrogenated carbon. By providing the above-mentioned metallic layer, laser texturing can now be used in conjunction with glass substrates.
Inventors
- 👤 Caroline A. Ross
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 18:10
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/84; G11B5/8404; G11B5/62; G11B5/73; G11B5/7368; G11B5/739; G11B5/73911; G11B5/73913; G11B5/73917; G11B5/73921; G11B5/8408
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
62 words
A method of making a magnetic disk comprising the steps of: depositing a metallic initiation layer on an unpolished glass substrate; electroless plating a texture layer on said metallic initiation layer, said initiation layer initiating electroless plating of said texture layer onto said substrate; polishing said texture layer: laser texturing said texture layer; and depositing a magnetic layer on said texture layer.
Claim 2
Independent Claim
62 words
A method of making a magnetic disk comprising the steps of: depositing a metallic initiation layer on an unpolished glass substrate; electroless plating a texture layer on said metallic initiation layer, said initiation layer initiating electroless plating of said texture layer onto said substrate; polishing said texture layer: laser texturing said texture layer; and depositing a magnetic layer on said texture layer.
Claim 3
Dependent Claim
10 words
Method of claim 1 wherein said texture layer is metallic.
Claim 4
Dependent Claim
21 words
Method of claim 1 wherein said texture layer comprises a material selected from the group consisting of CoP, FeP and NiP.
Claim 5
Dependent Claim
20 words
Method of claim 1 further comprising the step of polishing said texture layer prior to laser texturing said texture layer.
Claim 6
Dependent Claim
26 words
Method of claim 1 wherein said initiation layer comprises a material selected from the group consisting of Zn, Pd, Co, Fe, Rh, Be, NiP and Ni.
Claim 7
Dependent Claim
31 words
Method of claim 5 wherein said initiation layer is an alloy of at least one material selected from the group consisting of Zn, Pd, Co, Fe, Rh, Be, NiP and Ni.
Claim 8
Dependent Claim
13 words
Method of claim 1 wherein said initiation layer is formed by vacuum deposition.
Claim 9
Dependent Claim
12 words
Method of claim 7 wherein said initiation layer is formed by sputtering.
Claim 10
Dependent Claim
46 words
Method of claim 1 wherein said initiation layer comprises Zn, and said step of depositing said initiation layer comprises the steps of: depositing a metallic layer on said substrate; and subjecting said substrate to a zincate process, whereby said metallic layer is at least partially consumed.
Claim 11
Dependent Claim
24 words
Method of claim 9 wherein said metallic layer comprises a material selected from the group consisting of Al, Mg, Al alloys and Mg alloys.
Claim 12
Dependent Claim
20 words
Method of claim 1 further comprising the step of forming an adhesion layer between said substrate and said initiation layer.
Claim 13
Dependent Claim
24 words
Method of claim 11 wherein said adhesion layer comprises a material selected from the group consisting of Cr, Ta, Mo, W, V or Nb.
Claim 14
Dependent Claim
13 words
Method of claim 1 wherein said initiation layer is formed by vacuum deposition.
Claim 15
Dependent Claim
34 words
Method of claim 1 further comprising the step of forming an underlayer on said texture layer after said step of laser texturing said texture layer and before said step of deositing said magnetic layer.
Claim 16
Independent Claim
66 words
A method for manufacturing a magnetic disk comprising the steps of: depositing a metallic initiation layer onto a glass substrate; electroless plating a NiP layer onto said substrate after said step of depositing said metallic initiation layer, said initiation layer initiating said electroless plating of NiP; laser texturing said NiP layer; and depositing a magnetic layer onto said NiP layer after said step of laser texturing.
Claim 17
Independent Claim
66 words
A method for manufacturing a magnetic disk comprising the steps of: depositing a metallic initiation layer onto a glass substrate; electroless plating a NiP layer onto said substrate after said step of depositing said metallic initiation layer, said initiation layer initiating said electroless plating of NiP; laser texturing said NiP layer; and depositing a magnetic layer onto said NiP layer after said step of laser texturing.
Claim 18
Dependent Claim
74 words
Method of claim 15 further comprising the step of forming an adhesion layer between said substrate and initiation layer, said adhesion layer comprising a material selected from the group of materials consisting of Cr, TP, Ta, Mo, W, V and Nb, said method further comprising the step of depositing an underlayer between said NiP layer and said magnetic layer, said underlayer comprising a sputtered material selected from the group consisting of NiP and Cr.
Claim 19
Dependent Claim
62 words
Method of making a magnetic disk comprising the steps of: depositing an initiation layer on an unpolished glass substrate; electroless plating a plated layer on said initiation layer, said initiation layer initiating electroless plating of said plated layer on said substrate; polishing said plated layer; texturing said plated layer; and then depositing an underlayer and a magnetic layer onto said plated layer.
Claim 20
Dependent Claim
62 words
Method of making a magnetic disk comprising the steps of: depositing an initiation layer on an unpolished glass substrate; electroless plating a plated layer on said initiation layer, said initiation layer initiating electroless plating of said plated layer on said substrate; polishing said plated layer; texturing said plated layer; and then depositing an underlayer and a magnetic layer onto said plated layer.
Claim 21
Dependent Claim
15 words
Method of claim 17 wherein said plated layer is between 5 and 10 microns thick.
References Cited (Backward Citations)
US4833001A
Cited
US5087481A
Cited
US4786564A
Cited
US5153044A
Cited
US5250339A
Cited
US5062021A
Cited
US5108781A
Cited
US5180640A
Cited
EP0652554A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 2001-04-20 | 2001-10-20 | 2002-04-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2005-04-20 | 2005-10-20 | 2006-04-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2009-04-20 | 2009-10-20 | 2010-04-21 | $7700.00 | Window Closed / Lapsed |