Patent US5123933A successfully refreshed from Google Patents.
US5123933A
Expired / Lapsed
US
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Method of producing magnetic disk
Assignee: HGST Japan Ltd
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Filing: 1990-04-13
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Granted: 1992-06-23
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Expires: 2010-04-13
Abstract
Abstract A method of producing a magnetic disk by lapping a magnetic disk medium, comprising the steps of: preparing a lapping tape having an abrasive particle layer provided with abrasive particle clusters and chip pockets formed between adjacent two clusters, each of said clusters having abrasive particles of Al 2 O 3 or SiC and abrasive particles of diamond, lapping the surface of said magnetic disk medium by using the thus prepared lapping tape.
Inventors
- 👤 Yasushi Ito
- 👤 Masaaki Imamura
- 👤 Yoshiki Kato
- 👤 Jun Fumioka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 06:04
CPC Classifications
B; B24; B24B; B24B37/00; B24B37/04; B24B37/07; B24B37/08; B24B7/00; B24B7/10; B24B7/16; B24B7/17; B24D; B24D11/00; B24D11/001; B24D3/00; B24D3/34; B24D3/346; G; G11; G11B; G11B5/00; G11B5/84; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24355; Y10T428/24372; Y10T428/25; Y10T428/256; Y10T428/257; Y10T428/259
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
55 words
A method of lapping a body to be lapped, comprising the steps of preparing a lapping member having a substrate and an abrasive layer formed on said substrate which abrasive layer includes at least two kinds of abrasive material different from each other in hardness, and lapping said body by use of said lapping member.
Claim 2
Independent Claim
55 words
A method of lapping a body to be lapped, comprising the steps of preparing a lapping member having a substrate and an abrasive layer formed on said substrate which abrasive layer includes at least two kinds of abrasive material different from each other in hardness, and lapping said body by use of said lapping member.
Claim 3
Dependent Claim
20 words
A method of lapping according to claim 1, wherein said lapping member is a lapping tape having a flexible substrate.
Claim 4
Dependent Claim
31 words
A method of lapping according to claim 1 or 2, wherein said abrasive materials include diamond and one kind selected from the group consisting of Al 2 O 3 and SiC.
Claim 5
Dependent Claim
50 words
A method of lapping according to claim 3, wherein the content of said diamond is not more than about 10 wt %, the content of said one kind selected from the group consisting of Al 2 O 3 and SiC being in a range of about 40% to about 89%.
Claim 6
Dependent Claim
28 words
A method of lapping according to claim 4, wherein said abrasive materials exist in a form of clusters in the abrasive layer, recesses being formed between the clusters.
Claim 7
Independent Claim
26 words
A method of lapping according to claims 1 or 2, wherein the abrasive materials include diamond and a substance having a hardness lower than the diamond.
Claim 8
Independent Claim
71 words
A method of lapping a body to be lapped, comprising the steps of preparing a lapping tape including a first abrasive material having a hardness not less than that of a hardest material constituting a surface portion of said body and a second abrasive material having a hardness lower than that of the hardest material constituting said surface portion of said body, and lapping said body by use of said tape.
Claim 9
Independent Claim
71 words
A method of lapping a body to be lapped, comprising the steps of preparing a lapping tape including a first abrasive material having a hardness not less than that of a hardest material constituting a surface portion of said body and a second abrasive material having a hardness lower than that of the hardest material constituting said surface portion of said body, and lapping said body by use of said tape.
Claim 10
Independent Claim
55 words
A method of lapping a body to be lapped, comprising the steps of preparing a lapping tape including a first abrasive material having hardness not less than that of a hardest material constituting a surface portion of said body and a second abrasive material having a hardness lower than that of said first abrasive material.
Claim 11
Independent Claim
55 words
A method of lapping a body to be lapped, comprising the steps of preparing a lapping tape including a first abrasive material having hardness not less than that of a hardest material constituting a surface portion of said body and a second abrasive material having a hardness lower than that of said first abrasive material.
Claim 12
Dependent Claim
58 words
A method of lapping according to claim 7 or 8, wherein said body to be lapped is a magnetic disk having a magnetic layer, said method further comprising the steps of rotating the magnetic disk, contacting the lapping tape with the surface of the rotating disk, and moving the lapping tape in contact with the rotating magnetic disk.
Claim 13
Independent Claim
109 words
A method comprising the steps of: preparing a lapping tape having an abrasive material layer provided with abrasive material clusters and chip pockets having an area of about 15-about 30% of entire surface of said layer formed between adjacent two clusters, each of said clusters having abrasive material of Al 2 O 3 or SiC and abrasive material of diamond, and binder resin said abrasive material layer comprising about 40 to about 89% by weight Al 2 O 3 of SiC abrasive material, and less than about 10% be weight diamond abrasive material, and lapping the surface of said magnetic disk medium by using the thus prepared lapping tape.
Claim 14
Independent Claim
109 words
A method comprising the steps of: preparing a lapping tape having an abrasive material layer provided with abrasive material clusters and chip pockets having an area of about 15-about 30% of entire surface of said layer formed between adjacent two clusters, each of said clusters having abrasive material of Al 2 O 3 or SiC and abrasive material of diamond, and binder resin said abrasive material layer comprising about 40 to about 89% by weight Al 2 O 3 of SiC abrasive material, and less than about 10% be weight diamond abrasive material, and lapping the surface of said magnetic disk medium by using the thus prepared lapping tape.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-06-23 | 1995-12-23 | 1996-06-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-06-23 | 1999-12-23 | 2000-06-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-06-23 | 2003-12-23 | 2004-06-23 | $7700.00 | Window Closed / Lapsed |