US5070425A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Surface structure of a magnetic disk
Assignee: Mitsubishi Electric Corp
•
Filing: 1991-02-27
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Granted: 1991-12-03
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Expires: 2011-02-27
Abstract
Abstract A magnetic disk, which has a surface with two groups of streaks, the streaks in one group crossing with those in the other group, thus reducing the dynamic friction between a magnetic head and the magnetic disk and also variations in the dynamic friction.
Inventors
- 👤 Mitsuo Inumochi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 11:00
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/74; G11B5/82
Claims Analysis
Total Claims: 41
Claim 1
Independent Claim
45 words
A magnetic disk having a surface with two groups of arcuate streaks, the streaks in one of said two groups crossing with multiple streaks in the other group wherein an angle θ of intersection of the streaks is in a range of 10° to 160°.
Claim 2
Dependent Claim
45 words
A magnetic disk having a surface with two groups of arcuate streaks, the streaks in one of said two groups crossing with multiple streaks in the other group wherein an angle θ of intersection of the streaks is in a range of 10° to 160°.
Claim 3
Dependent Claim
33 words
The magnetic disk as set forth in claim 1 wherein said streaks are provided over a substantial portion of said magnetic disk including areas thereof outside a landing zone of said magnetic disk.
Claim 4
Dependent Claim
45 words
A magnetic disk having a surface with two groups of arcuate streaks, the streaks in one of said two groups crossing with multiple streaks in the other group wherein an angle θ of intersection of the streaks is in a range of 30° to 150°.
Claim 5
Dependent Claim
45 words
A magnetic disk having a surface with two groups of arcuate streaks, the streaks in one of said two groups crossing with multiple streaks in the other group wherein an angle θ of intersection of the streaks is in a range of 30° to 150°.
Claim 6
Dependent Claim
45 words
A magnetic disk having a surface with two groups of arcuate streaks, the streaks in one of said two groups crossing with multiple steaks in the other group wherein an angle θ of intersection of the streaks is in a range of 60° to 120°.
Claim 7
Dependent Claim
45 words
A magnetic disk having a surface with two groups of arcuate streaks, the streaks in one of said two groups crossing with multiple steaks in the other group wherein an angle θ of intersection of the streaks is in a range of 60° to 120°.
Claim 8
Dependent Claim
39 words
A magnetic disk having a surface with two groups of arcuate streaks, the streaks in one of said two groups crossing with multiple steaks in the other group wherein an angle θ of intersection of the streaks is 90°.
Claim 9
Dependent Claim
39 words
A magnetic disk having a surface with two groups of arcuate streaks, the streaks in one of said two groups crossing with multiple steaks in the other group wherein an angle θ of intersection of the streaks is 90°.
Claim 10
Dependent Claim
53 words
A magnetic disk having a surface with two groups of streaks, the streaks in one of said two groups crossing with those in the other group neither group being concentric about a center of the disk, wherein an angle θ of intersection of the streaks is in a range of 10° to 160°.
Claim 11
Dependent Claim
53 words
A magnetic disk having a surface with two groups of streaks, the streaks in one of said two groups crossing with those in the other group neither group being concentric about a center of the disk, wherein an angle θ of intersection of the streaks is in a range of 10° to 160°.
Claim 12
Dependent Claim
29 words
The magnetic disk as set forth in claim 6 wherein each streak of said two groups terminates at points proximate each of inside and outside edges of the disk.
Claim 13
Dependent Claim
33 words
The magnetic disk as set forth in claim 6 wherein said streaks are provided over a substantial portion of said magnetic disk including areas thereof outside a landing zone of said magnetic disk.
Claim 14
Dependent Claim
53 words
A magnetic disk having a surface with two groups of streaks, the streaks in one of said two groups crossing with those in the other group, neither group being concentric about a center of the disk, wherein an angle θ of intersection of the streaks is in a range of 30° to 150°.
Claim 15
Dependent Claim
53 words
A magnetic disk having a surface with two groups of streaks, the streaks in one of said two groups crossing with those in the other group, neither group being concentric about a center of the disk, wherein an angle θ of intersection of the streaks is in a range of 30° to 150°.
Claim 16
Dependent Claim
29 words
The magnetic disk as set forth in claim 9 wherein each streak of said two groups terminates at points proximate each of inside and outside edges of the disk.
Claim 17
Dependent Claim
33 words
The magnetic disk as set forth in claim 9 wherein said streaks are provided over a substantial portion of said magnetic disk including areas thereof outside a landing zone of said magnetic disk.
Claim 18
Dependent Claim
53 words
A magnetic disk having a surface with two groups of streaks, the streaks in one of said two groups crossing with those in the other group, neither group being concentric about a center of the disk, wherein an angle θ of intersection of the streaks is in a range of 60° to 120°.
Claim 19
Dependent Claim
53 words
A magnetic disk having a surface with two groups of streaks, the streaks in one of said two groups crossing with those in the other group, neither group being concentric about a center of the disk, wherein an angle θ of intersection of the streaks is in a range of 60° to 120°.
Claim 20
Dependent Claim
29 words
The magnetic disk as set forth in claim 12 wherein each streak of said two groups terminates at points proximate each of inside and outside edges of the disk.
Claim 21
Dependent Claim
33 words
The magnetic disk as set forth in claim 12 wherein said streaks are provided over a substantial portion of said magnetic disk including areas thereof outside a landing zone of said magnetic disk.
Claim 22
Dependent Claim
47 words
A magnetic disk having a surface with two groups of streaks, the streaks in one of said two groups crossing with those in the other group, neither group being concentric about a center of the disk, wherein an angle θ of intersection of the streaks is 90°.
Claim 23
Dependent Claim
47 words
A magnetic disk having a surface with two groups of streaks, the streaks in one of said two groups crossing with those in the other group, neither group being concentric about a center of the disk, wherein an angle θ of intersection of the streaks is 90°.
Claim 24
Dependent Claim
29 words
The magnetic disk as set forth in claim 15 wherein each streak of said two groups terminates at points proximate each of inside and outside edges of the disk.
Claim 25
Dependent Claim
33 words
The magnetic disk as set forth in claim 15 wherein each streaks are provided over a substantial portion of said magnetic disk including areas thereof outside a landing zone of said magnetic disk.
Claim 26
Dependent Claim
44 words
A magnetic disk having a surface with two groups of arcuate streaks, the streaks in one of said two groups crossing with those in the other group, wherein an angle θ of intersection of the streaks is in a range of 10° to 160°.
Claim 27
Dependent Claim
44 words
A magnetic disk having a surface with two groups of arcuate streaks, the streaks in one of said two groups crossing with those in the other group, wherein an angle θ of intersection of the streaks is in a range of 10° to 160°.
Claim 28
Dependent Claim
25 words
The magnetic disk as set forth in claim 18 comprising the steaks in one of said two groups crossing multiple streaks in the other group.
Claim 29
Dependent Claim
34 words
The magnetic disk as set forth in claim 18 wherein said streaks are provided over a substantial portion of said magnetic disk including areas thereof outside of a landing zone of said magnetic disk.
Claim 30
Dependent Claim
44 words
A magnetic disk having a surface with two groups of arcuate streaks, the streaks in one of said two groups crossing with those in the other group, wherein an angle θ of intersection of the steaks is in a range of 30° to 150°.
Claim 31
Dependent Claim
44 words
A magnetic disk having a surface with two groups of arcuate streaks, the streaks in one of said two groups crossing with those in the other group, wherein an angle θ of intersection of the steaks is in a range of 30° to 150°.
Claim 32
Dependent Claim
25 words
The magnetic disk as set forth in claim 21 comprising the streaks in one of said two groups crossing multiple streaks in the other group.
Claim 33
Dependent Claim
34 words
The magnetic disk as set forth in claim 21 wherein said streaks are provided over a substantial portion of said magnetic disk including areas thereof outside of a landing zone of said magnetic disk.
Claim 34
Dependent Claim
44 words
A magnetic disk having a surface with two groups of arcuate streaks, the streaks in one of said two groups crossing with those in the other group, wherein an angle θ of intersection of the streaks is in a range of 60° to 120°.
Claim 35
Dependent Claim
44 words
A magnetic disk having a surface with two groups of arcuate streaks, the streaks in one of said two groups crossing with those in the other group, wherein an angle θ of intersection of the streaks is in a range of 60° to 120°.
Claim 36
Dependent Claim
25 words
The magnetic disk as et forth in claim 24 comprising the streaks in one of said two groups crossing multiple streaks in the other group.
Claim 37
Dependent Claim
34 words
The magnetic disk as set forth in claim 24 wherein said streaks are provided over a substantial portion of said magnetic disk including areas thereof outside of a landing zone of said magnetic disk.
Claim 38
Dependent Claim
38 words
A magnetic disk having a surface with two groups of arcuate streaks, the streaks in one of said two groups crossing with those in the other group, wherein an angle θ of intersection of the steaks is 90°.
Claim 39
Dependent Claim
38 words
A magnetic disk having a surface with two groups of arcuate streaks, the streaks in one of said two groups crossing with those in the other group, wherein an angle θ of intersection of the steaks is 90°.
Claim 40
Dependent Claim
25 words
The magnetic disk as set forth in claim 27 comprising the streaks in one of said two groups crossing multiple streaks in the other group.
Claim 41
Dependent Claim
34 words
The magnetic disk as set forth in claim 27 wherein said streaks are provided over a substantial portion of said magnetic disk including areas thereof outside of a landing zone of said 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) | 1994-12-02 | 1995-06-03 | 1995-12-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-12-02 | 1999-06-03 | 1999-12-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-12-02 | 2003-06-03 | 2003-12-03 | $7700.00 | Window Closed / Lapsed |