US5453890A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Low airflow hard disk apparatus
Assignee: Nidec Corp
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Filing: 1994-03-09
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Granted: 1995-09-26
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Expires: 2014-03-09
Abstract
Abstract A low airflow hard disk apparatus comprises a base, a cover member, a rotational portion disposed in a disk chamber, a hard disk held by and rotatable with the rotational portion, a first projection portion disposed on the lower surface of the cover member and facing toward the upper surface of the hard disk, and a second projection portion disposed on the upper surface of the base and facing toward the lower surface of the hard disk. The first and second projection portions, preferably radially extending fins, prevent an air flow from generating by the rotation of the hard disk.
Inventors
- 👤 Kiyoyoshi Takegami
- 👤 Yoichi Mori
- 👤 Hirotada Itoi
- 👤 Itsuo Miyaji
- 👤 Hiroyuki Yonei
- 👤 Kihachiro Ohta
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 16:07
CPC Classifications
G; G11; G11B; G11B33/00; G11B33/12; G11B33/121; G11B19/00; G11B19/20; G11B19/2009; G11B25/00; G11B25/04; G11B25/043; G11B33/14; G11B33/148; G11B33/1486
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
120 words
A hard disk apparatus comprising: a base; a cover member covering the upper surface of said base to define a disk chamber; a rotational portion and a means for rotating said rotational portion disposed in said disk chamber; a hard disk held by said rotational portion and arranged to be rotated together with said rotational portion; first projection portions disposed on the lower surface of said cover member and immediately facing the upper surface of said hard disk; and second projection portions disposed on the upper surface of said base and immediately facing the lower surface of said hard disk, the first and second projection portions preventing an air flow from being generated by the rotation of said hard disk.
Claim 2
Dependent Claim
120 words
A hard disk apparatus comprising: a base; a cover member covering the upper surface of said base to define a disk chamber; a rotational portion and a means for rotating said rotational portion disposed in said disk chamber; a hard disk held by said rotational portion and arranged to be rotated together with said rotational portion; first projection portions disposed on the lower surface of said cover member and immediately facing the upper surface of said hard disk; and second projection portions disposed on the upper surface of said base and immediately facing the lower surface of said hard disk, the first and second projection portions preventing an air flow from being generated by the rotation of said hard disk.
Claim 3
Dependent Claim
14 words
A hard disk apparatus according to claim 1, wherein said projection portions are fins.
Claim 4
Dependent Claim
15 words
A hard disk apparatus according to claim 1, wherein said projection portions are radially provided.
Claim 5
Dependent Claim
34 words
A hard disk apparatus according to claim 1, wherein an annular recess is formed in said base and said means for rotating said rotational portion is at least partially accommodated in said annular recess.
Claim 6
Dependent Claim
92 words
A hard disk apparatus according to claim 4, wherein a cylindrical projection portion is erected from the inner bottom surface of said annular recess, and means for rotating said said rotational portion is a spindle motor having a stator secured to the outer surface of said cylindrical projection portion, a rotational shaft rotatively supported on the inside of said cylindrical projection portion via bearings, a rotor hub integrally formed with said rotational shaft and a rotor magnet provided for said rotor hub to face said stator while interposing a circumferential directional gap.
References Cited (Backward Citations)
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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) | 1998-09-25 | 1999-03-27 | 1999-09-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-09-25 | 2003-03-27 | 2003-09-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-09-25 | 2007-03-27 | 2007-09-26 | $7700.00 | Window Closed / Lapsed |