Patent US5210665A successfully refreshed from Google Patents.
US5210665A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Floppy disk apparatus having an improved disk rotating mechanism
Assignee: Panasonic Holdings Corp
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Filing: 1991-03-11
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Granted: 1993-05-11
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Expires: 2011-03-11
Abstract
Abstract A magnetic recording/reproduction apparatus including a motor for rotating a magnetic recording medium such as a floppy disk. The motor has a rotating shaft, a pivot bearing member for supporting the rotating shaft in a thrust direction; a dynamic pressure type radial fluid bearing for rotatably supporting the rotating shaft through a lubricant inside its sleeve, a stator attached to the radial fluid bearing, coils provided on the stator; a rotor fixed to the rotating shaft, and a magnet attached to the rotor. The rotor may have a flange-like engagement portion capable of engaging with a stopper portion formed in a predetermined position to prevent the rotating shaft from coming off the bearing. Preferably, the pivot bearing member is formed of a material having a Vickers hardness of 1200 or higher and is fixed to the sleeve by caulking, the ratio of the diameter of the rotating shaft and the length of the radial fluid bearing in the thrust direction is 1:0.8 to 2, and the diameter of the rotating shaft is not greater than 4.0 mm. The engagement portion at the outer end of the rotor may be constituted by a frequency generator magnet.
Inventors
- 👤 Hiroshi Nishizawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 21:29
CPC Classifications
G; G11; G11B; G11B25/00; G11B25/04; G11B25/043; G11B19/00; G11B19/20; G11B19/2009; H; H02; H02K; H02K29/00; H02K29/14; H02K5/00; H02K5/04; H02K5/16; H02K5/167; H02K5/1675
Claims Analysis
Total Claims: 26
Claim 1
Independent Claim
100 words
A floppy disk apparatus comprising: a rotating shaft for rotating a disk-like magnetic recording medium; a pivot bearing member for supporting said rotating shaft in a thrust direction; a dynamic pressure type radial fluid bearing having a sleeve and rotatably supporting said rotating shaft through a lubricant inside said sleeve; a stator attached to said radial fluid bearing; coil means provided on said stator; a rotor fixed to said rotating shaft; and magnet means attached to said rotor wherein the dynamic pressure of said lubricant enables said rotating shaft to be supported with high accuracy and without contracting said sleeve.
Claim 2
Dependent Claim
100 words
A floppy disk apparatus comprising: a rotating shaft for rotating a disk-like magnetic recording medium; a pivot bearing member for supporting said rotating shaft in a thrust direction; a dynamic pressure type radial fluid bearing having a sleeve and rotatably supporting said rotating shaft through a lubricant inside said sleeve; a stator attached to said radial fluid bearing; coil means provided on said stator; a rotor fixed to said rotating shaft; and magnet means attached to said rotor wherein the dynamic pressure of said lubricant enables said rotating shaft to be supported with high accuracy and without contracting said sleeve.
Claim 3
Dependent Claim
64 words
A floppy disk apparatus according to claim 1, further comprising a stopper disposed at a predetermined position at a radially outer extremity of said rotor and wherein said rotor has a radially outwardly projecting engagement portion for engaging with said stopper portion wherein the dynamic pressure of said lubricant enables said rotating shaft to be supported with high accuracy and without contracting said sleeve.
Claim 4
Dependent Claim
26 words
A floppy disk apparatus according to claim 1, wherein said pivot bearing member is formed of a material having a Vickers hardness of 1200 or higher.
Claim 5
Dependent Claim
26 words
A floppy disk apparatus according to claim 2, wherein said pivot bearing member is formed of a material having a Vickers hardness of 1200 or higher.
Claim 6
Dependent Claim
20 words
A floppy disk apparatus according to claim 1, wherein said pivot bearing member is fixed to said sleeve by caulking.
Claim 7
Dependent Claim
20 words
A floppy disk apparatus according to claim 2, wherein said pivot bearing member is fixed to said sleeve by caulking.
Claim 8
Dependent Claim
20 words
A floppy disk apparatus according to claim 3, wherein said pivot bearing member is fixed to said sleeve by caulking.
Claim 9
Dependent Claim
20 words
A floppy disk apparatus according to claim 4, wherein said pivot bearing member is fixed to said sleeve by caulking.
Claim 10
Dependent Claim
68 words
A floppy disk apparatus according to claim 1, wherein said rotating shaft has a diameter enabling said shaft to be radially supported inside said sleeve and said sleeve has a length sufficient to support said rotating shaft in said thrust direction and wherein a ratio of the diameter of said rotating shaft and the length of said radial fluid bearing in the thrust direction is 1:0.8 to 2.
Claim 11
Dependent Claim
68 words
A floppy disk apparatus according to claim 2, wherein said rotating shaft has a diameter enabling said shaft to be radially supported inside said sleeve and said sleeve has a length sufficient to support said rotating shaft in said thrust direction and wherein a ratio of the diameter of said rotating shaft and the length of said radial fluid bearing in the thrust direction is 1:0.8 to 2.
Claim 12
Dependent Claim
68 words
A floppy disk apparatus according to claim 3, wherein said rotating shaft has a diameter enabling said shaft to be radially supported inside said sleeve and said sleeve has a length sufficient to support said rotating shaft in said thrust direction and wherein a ratio of the diameter of said rotating shaft and the length of said radial fluid bearing in the thrust direction is 1:0.8 to 2.
Claim 13
Dependent Claim
68 words
A floppy disk apparatus according to claim 4, wherein said rotating shaft has a diameter enabling said shaft to be radially supported inside said sleeve and said sleeve has a length sufficient to support said rotating shaft in said thrust direction and wherein a ratio of the diameter of said rotating shaft and the length of said radial fluid bearing in the thrust direction is 1:0.8 to 2.
Claim 14
Dependent Claim
68 words
A floppy disk apparatus according to claim 5, wherein said rotating shaft has a diameter enabling said shaft to be radially supported inside said sleeve and said sleeve has a length sufficient to support said rotating shaft in said thrust direction and wherein a ratio of the diameter of said rotating shaft and the length of said radial fluid bearing in the thrust direction is 1:0.8 to 2.
Claim 15
Dependent Claim
68 words
A floppy disk apparatus according to claim 6, wherein said rotating shaft has a diameter enabling said shaft to be radially supported inside said sleeve and said sleeve has a length sufficient to support said rotating shaft in said thrust direction and wherein a ratio of the diameter of said rotating shaft and the length of said radial fluid bearing in the thrust direction is 1:0.8 to 2.
Claim 16
Dependent Claim
68 words
A floppy disk apparatus according to claim 7, wherein said rotating shaft has a diameter enabling said shaft to be radially supported inside said sleeve and said sleeve has a length sufficient to support said rotating shaft in said thrust direction and wherein a ratio of the diameter of said rotating shaft and the length of said radial fluid bearing in the thrust direction is 1:0.8 to 2.
Claim 17
Dependent Claim
68 words
A floppy disk apparatus according to claim 8, wherein said rotating shaft has a diameter enabling said shaft to be radially supported inside said sleeve and said sleeve has a length sufficient to support said rotating shaft in said thrust direction and wherein a ratio of the diameter of said rotating shaft and the length of said radial fluid bearing in the thrust direction is 1:0.8 to 2.
Claim 18
Dependent Claim
21 words
A floppy disk apparatus according to claim 9, wherein said diameter of said rotating shaft is not greater than 4.0 mm.
Claim 19
Dependent Claim
21 words
A floppy disk apparatus according to claim 10, wherein said diameter of said rotating shaft is not greater than 4.0 mm.
Claim 20
Dependent Claim
21 words
A floppy disk apparatus according to claim 11, wherein said diameter of said rotating shaft is not greater than 4.0 mm.
Claim 21
Dependent Claim
21 words
A floppy disk apparatus according to claim 12, wherein said diameter of said rotating shaft is not greater than 4.0 mm.
Claim 22
Dependent Claim
21 words
A floppy disk apparatus according to claim 13, wherein said diameter of said rotating shaft is not greater than 4.0 mm.
Claim 23
Dependent Claim
21 words
A floppy disk apparatus according to claim 14, wherein said diameter of said rotating shaft is not greater than 4.0 mm.
Claim 24
Dependent Claim
21 words
A floppy disk apparatus according to claim 15, wherein said diameter of said rotating shaft is not greater than 4.0 mm.
Claim 25
Dependent Claim
21 words
A floppy disk apparatus according to claim 16, wherein said diameter of said rotating shaft is not greater than 4.0 mm.
Claim 26
Dependent Claim
24 words
A floppy disk apparatus according to claim 2, wherein the engagement portion of said rotor comprises a magnet serving also as a frequency generator.
References Cited (Backward Citations)
US4363047A
Cited
US4497002A
Cited
US4366519A
Cited
US4651241A
Cited
JPS5963024A
Cited
US4706143A
Cited
JPS61269286A
Cited
US4874976A
Cited
US5019926A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1996-05-10 | 1996-11-09 | 1997-05-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-05-10 | 2000-11-09 | 2001-05-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-05-10 | 2004-11-09 | 2005-05-11 | $7700.00 | Window Closed / Lapsed |