Patent US4625249A successfully refreshed from Google Patents.
US4625249A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Head holding mechanism of magnetic disk device
Assignee: Alps Alpine Co Ltd
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Filing: 1985-11-29
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Granted: 1986-11-25
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Expires: 2005-11-29
Abstract
Abstract In a head holding mechanism of a magnetic disk device wherein a pair of heads come into contact with both the surfaces of a magnetic disk and are respectively mounted through leaf springs, the leaf springs are embedded in respective vibration absorbers so that resonance of the leaf springs is prevented and the heads follow any warp of the magnetic disk well.
Inventors
- 👤 Tetsuya Iwata
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 17:49
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/48; G11B5/58; F; F16; F16F; F16F3/00; F16F3/08; F16F3/10; F16F3/12
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
76 words
In a head holding mechanism for a magnetic disk device having at least one magnetic head adapted to engage a surface of a magnetic disk, a frame, a gimbal mounted on said frame, and said magnetic head mounted on said gimbal, the improvement comprising an uneven layer of a vibration absorbent material applied to at least one surface of said gimbal so as to provide a diffuse dampening characteristic over a wide range of vibration frequencies.
Claim 2
Dependent Claim
76 words
In a head holding mechanism for a magnetic disk device having at least one magnetic head adapted to engage a surface of a magnetic disk, a frame, a gimbal mounted on said frame, and said magnetic head mounted on said gimbal, the improvement comprising an uneven layer of a vibration absorbent material applied to at least one surface of said gimbal so as to provide a diffuse dampening characteristic over a wide range of vibration frequencies.
Claim 3
Dependent Claim
38 words
A head holding mechanism of a magnetic disk device as defined in claim 1, wherein said vibration absorbent material is a paste absorbent material is formed from silicone rubber doped with a fine powder of SiO 2 .
Claim 4
Dependent Claim
31 words
A head holding mechanism of a magnetic disk device as defined in claim 1, wherein a respective cover sheet is secured to each said gimbal for preventing the entry of dust.
Claim 5
Dependent Claim
41 words
The head holding mechanism of claim 1, further comprising a second magnetic head, opposed to the one magnetic head, which is mounted on a second gimbal haivng an uneven layer of vibration absorbent material applied to at least one surface thereof.
Claim 6
Dependent Claim
27 words
The heat holding mechanism of claim 1, wherein said uneven layer is formed on an upper surface of said gimbal from a paste of vibration absorbent material.
Claim 7
Dependent Claim
26 words
The head holding mechanism of claim 1, wherein said uneven layer includes a portion applied to a coil structure forming a part of said magnetic head.
Claim 8
Dependent Claim
34 words
The head holding mechanism of claim 1, wherein a further layer of vibration absorbent mateial is formed on a lower surface of said gimbal so as to embed said gimbal between the two layers.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-11-24 | 1990-05-26 | 1990-11-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-11-24 | 1994-05-26 | 1994-11-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-11-24 | 1998-05-26 | 1998-11-25 | $7700.00 | Window Closed / Lapsed |