Patent US4819091A successfully refreshed from Google Patents.
US4819091A
Expired / Lapsed
US
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High speed magnetic disk contact recording system
Assignee: International Business Machines Corp
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Filing: 1987-04-30
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Granted: 1989-04-04
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Expires: 2007-04-30
Abstract
Abstract A high speed magnetic disk recording system is described in which the recording medium comprises a substrate having a magnetic coating thereon, and a magnetic recording transducer is operated in physical contact with the recording medium. The magnetic transducer comprises a single crystal material on at least the surface which contacts the recording medium. The single crystal material has a high thermal conductivity, a low friction coefficient and a high surface energy so that, when relative motion is provided between the magnetic recording transucer and the recording medium, an attractive force is generated which maintains the magnetic recording transducer in contact with the recording medium so that high density recorded data can be reliably written and sensed without excessive wear to either the magnetic transducer or the recording medium.
Inventors
- 👤 Blasius Brezoczky
- 👤 Emil Hopner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 14:39
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/48; G11B5/58; G11B5/581; G11B5/10
Claims Analysis
Total Claims: 27
Claim 1
Independent Claim
164 words
A high speed magnetic disk contact recording system comprising: a magnetic recording medium comprising a rigid substrate having a magnetic coating thereon, a magnetic recording transducer and means to support said transducer in physical contact with said magnetic recording medium, said magnetic recording transducer comprising a substrate of a nonconducting single crystal material having a high thermal conductivity, a low friction coefficient and a high surface energy, and means to produce relative motion between said magnetic recording medium and said magnetic recording transducer up to a selected operating speed to produce a force of a magnitude by which said transducer is capable of running in contact with said recording medium without the application of external force whereby said magnetic recording is maintained in continuous and direct contact with said magnetic recording medium during said relative motion at said selected operating speed so that high density recorded data can be reliably written and sensed without excessive wear to either said transducer or said recording medium.
Claim 2
Dependent Claim
164 words
A high speed magnetic disk contact recording system comprising: a magnetic recording medium comprising a rigid substrate having a magnetic coating thereon, a magnetic recording transducer and means to support said transducer in physical contact with said magnetic recording medium, said magnetic recording transducer comprising a substrate of a nonconducting single crystal material having a high thermal conductivity, a low friction coefficient and a high surface energy, and means to produce relative motion between said magnetic recording medium and said magnetic recording transducer up to a selected operating speed to produce a force of a magnitude by which said transducer is capable of running in contact with said recording medium without the application of external force whereby said magnetic recording is maintained in continuous and direct contact with said magnetic recording medium during said relative motion at said selected operating speed so that high density recorded data can be reliably written and sensed without excessive wear to either said transducer or said recording medium.
Claim 3
Dependent Claim
21 words
The high speed magnetic disk contact recording system of claim 1 wherein said single crystal material comprises a single crystal diamond.
Claim 4
Dependent Claim
25 words
The high speed magnetic disk contact recording system of claim 2 wherein said single crystal diamond is cut so that its crystalline orientation is <110>.
Claim 5
Dependent Claim
23 words
The high speed magnetic disk contact recording system of claim 1 wherein said single crystal material comprises a single crystal cubic boron nitride.
Claim 6
Dependent Claim
35 words
The high speed disk contact recording system of claim 1 wherein said single crystal material has a high thermal conductivity, a friction coefficient lower than 0.1 and a surface energy above 5000 ergs/cm 2 .
Claim 7
Dependent Claim
21 words
The high speed magnetic disk contact recording system of claim 1 wherein said magnetic recording medium comprises a particulate magnetic disk.
Claim 8
Dependent Claim
22 words
The high speed magnetic disk contact recording system of claim 1 wherein said magnetic recording medium comprises a thin film magnetic disk.
Claim 9
Dependent Claim
174 words
A high speed magnetic disk contact recording system comprising: a magnetic recording medium comprising a rigid substrate having a magnetic coating thereon, a magnetic recording transducer and means to support said transducer in physical contact with said magnetic recording medium, said magnetic recording transducer comprising a slider body, said slider body having a surface in contact with said magnetic recording medium comprising a nonconducting single crystal material, said single crystal material having a high surface energy, and means to produce relative motion between said magnetic recording medium and said magnetic recording transducer up to a selected operating speed to produce a force of a magnitude by which said transducer is capable of running in contact with said recording medium without the application of external force whereby said magnetic recording transducer is maintained in continuous and direct contact with said magnetic recording medium during said relative motion at said selected operating speed so that high density recorded data can be reliably written and sensed without excessive wear to either said transducer or said recording medium.
Claim 10
Dependent Claim
174 words
A high speed magnetic disk contact recording system comprising: a magnetic recording medium comprising a rigid substrate having a magnetic coating thereon, a magnetic recording transducer and means to support said transducer in physical contact with said magnetic recording medium, said magnetic recording transducer comprising a slider body, said slider body having a surface in contact with said magnetic recording medium comprising a nonconducting single crystal material, said single crystal material having a high surface energy, and means to produce relative motion between said magnetic recording medium and said magnetic recording transducer up to a selected operating speed to produce a force of a magnitude by which said transducer is capable of running in contact with said recording medium without the application of external force whereby said magnetic recording transducer is maintained in continuous and direct contact with said magnetic recording medium during said relative motion at said selected operating speed so that high density recorded data can be reliably written and sensed without excessive wear to either said transducer or said recording medium.
Claim 11
Dependent Claim
30 words
The high speed magnetic disk contact recording system of claim 8 wherein said single crystal material extends substantially over all of said surface in contact with said magnetic recording medium.
Claim 12
Dependent Claim
21 words
The high speed magnetic disk contact recording system of claim 9 wherein said single crystal material comprises a single crystal diamond.
Claim 13
Dependent Claim
25 words
The high speed magnetic disk contact recording system of claim 10 wherein said single crystal diamond is cut so that its crystalline orientation is <110>.
Claim 14
Dependent Claim
23 words
The high speed magnetic disk contact recording system of claim 9 wherein said single crystal material comprises a single crystal cubic boron nitride.
Claim 15
Dependent Claim
36 words
The high speed magnetic disk contact recording system of claim 9 wherein said single crystal material has a high thermal conductivity, a friction coefficient lower than 0.1 and a surface energy above 5000 ergs/cm 2 .
Claim 16
Dependent Claim
21 words
The high speed magnetic disk contact recording system of claim 9 wherein said slider body comprises a second single crystal material.
Claim 17
Dependent Claim
26 words
The high speed magnetic disk contact recording system of claim 14 wherein said single crystal material in contact with said magnetic recording medium is epitaxially grown.
Claim 18
Dependent Claim
30 words
The high speed magnetic disk contact recording system of claim 15 wherein said single crystal material in contact with said magnetic recording medium has a thickness of about 250 angstroms.
Claim 19
Dependent Claim
21 words
The high speed magnetic disk contact recording system of claim 8 wherein said magnetic recording medium comprises a particulate magnetic disk.
Claim 20
Dependent Claim
22 words
The high speed magnetic disk contact recording system of claim 8 wherein said magnetic recording medium comprises a thin film magnetic disk.
Claim 21
Dependent Claim
28 words
The high speed magnetic disk contact recording system of claim 8 wherein said single crystal material comprises a plurality of separate areas which contact the magnetic recording medium.
Claim 22
Dependent Claim
21 words
The high speed magnetic disk contact recording system of claim 19 wherein said single crystal material comprises a single crystal diamond.
Claim 23
Dependent Claim
25 words
The high speed magnetic disk contact recording system of claim 20 wherein said single crystal diamond is cut so that its crystalline orientation is <110>.
Claim 24
Dependent Claim
23 words
The high speed magnetic disk contact recording system of claim 19 wherein said single crystal material comprises a single crystal cubic boron nitride.
Claim 25
Dependent Claim
36 words
The high speed magnetic disk contact recording system of claim 19 wherein said single crystal material has a high thermal conductivity, a friction coefficient lower than 0.1 and a surface energy above 5000 ergs/cm 2 .
Claim 26
Dependent Claim
21 words
The high speed magnetic disk contact recording system of claim 19 wherein said magnetic recording medium comprises a particulate magnetic disk.
Claim 27
Dependent Claim
22 words
The high speed magnetic disk contact recording system of claim 19 wherein said magnetic recording medium comprises a thin film magnetic disk.
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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) | 1992-04-03 | 1992-10-03 | 1993-04-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-04-03 | 1996-10-03 | 1997-04-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-04-03 | 2000-10-03 | 2001-04-04 | $7700.00 | Window Closed / Lapsed |