US3713121A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Arm vibration damper
Assignee: International Business Machines Corp
•
Filing: 1970-05-25
•
Granted: 1973-01-23
•
Expires: 1990-05-25
Abstract
Abstract An air bearing magnetic head arm assembly includes a rigid mount portion; a support for carrying a magnetic transducer; a springloaded or pretensioned portion for urging the transducer towards a record surface; and incorporates a ramp that cooperates with a stationary cam to effectuate proper loading and unloading of the head relative to the record surface. To minimize resonance effects experienced by the arm during transducing operation, a damping element is inserted between the spring portion and the rigid mount, the damping element being located at the fulcrum of the spring.
Inventors
- 👤 J Riggins
- 👤 R Fasano
- 👤 M Hatch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:02
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/48; G11B5/54; G11B5/55; G11B5/5521; G11B5/58; G11B5/60
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
230 words
A magnetic head arm assembly useful for transducing signals recorded on a storage medium comprising: a support element for supporting a magnetic transducer, said magnetic transducer subject to flying height variations as it follows the surface of said storage medium due to torsional resonance which causes oscillatory angular motion along the longitudinal axis of said arm assembly; a rigid mounting element for mounting said head arm assembly to a movable receiver structure disposed within a storage apparatus; a spring element coupled between said support element and said mounting element and pretensioned so that said arm assembly is constantly urged towards said storage medium, the portion of said spring element adjacent said rigid mounting element defining a fulcrum; a ramp structure, formed asymmetrical in said support element for cooperating with a stationary cam, for loading and unloading said head arm assembly relative to said storage medium, said storage medium exerting a reactive force against said loaded magnetic transducer so as to impart oscillatory angular motion to said arm assembly along its longitudinal axis; and compressible damping means carried by said mounting element positioned adjacent said spring element along said fulcrum for dissipating energy, said angular motion of said spring element along its longitudinal axis compressing said damping means, thereby to minimize the resonance effects along the longitudinal axis of said arm assembly while minimizing flying height variations of said magnetic transducer.
Claim 2
Dependent Claim
230 words
A magnetic head arm assembly useful for transducing signals recorded on a storage medium comprising: a support element for supporting a magnetic transducer, said magnetic transducer subject to flying height variations as it follows the surface of said storage medium due to torsional resonance which causes oscillatory angular motion along the longitudinal axis of said arm assembly; a rigid mounting element for mounting said head arm assembly to a movable receiver structure disposed within a storage apparatus; a spring element coupled between said support element and said mounting element and pretensioned so that said arm assembly is constantly urged towards said storage medium, the portion of said spring element adjacent said rigid mounting element defining a fulcrum; a ramp structure, formed asymmetrical in said support element for cooperating with a stationary cam, for loading and unloading said head arm assembly relative to said storage medium, said storage medium exerting a reactive force against said loaded magnetic transducer so as to impart oscillatory angular motion to said arm assembly along its longitudinal axis; and compressible damping means carried by said mounting element positioned adjacent said spring element along said fulcrum for dissipating energy, said angular motion of said spring element along its longitudinal axis compressing said damping means, thereby to minimize the resonance effects along the longitudinal axis of said arm assembly while minimizing flying height variations of said magnetic transducer.
Claim 3
Dependent Claim
242 words
A magnetic head arm assembly useful for transducing signals recorded on a storage medium comprising: a support element for supporting a magnetic transducer, said magnetic transducer subject to flying height variations as it follows the surface of said storage medium due to torsional resonance which causes oscillatory angular motion along the longitudinal axis of said arm assembly, a rigid mounting element for mounting said head arm assembly to a movable receiver structure disposed with a storage apparatus; a spring element coupled between said support element and said mounting element and pretensioned so that said arm assembly is constantly urged towards said storage medium, the portion of said spring element adjacent said rigid mounting element defining a fulcrum; a ramp structure formed asymmetrically in said support element for cooperating with a stationary cam, for loading and unloading said head arm assembly relative to said storage medium, said storage medium exerting a reactive force against said loaded magnetic transducer so as to impart oscillatory angular motion to said arm assembly along its longitudinal axis; and a compressible resilient polyurethane element having a measured hardness of substantially 65 Shore A durometer carried by said mounting element positioned adjacent said spring element along said fulcrum for dissipating energy, said angular motion of said spring element along its longitudinal axis compressing said resilient polyurethane element, thereby to minimize resonant effects along the longitudinal axis of said arm assembly while minimizing flying height variations of said magnetic transducer.
Claim 4
Dependent Claim
242 words
A magnetic head arm assembly useful for transducing signals recorded on a storage medium comprising: a support element for supporting a magnetic transducer, said magnetic transducer subject to flying height variations as it follows the surface of said storage medium due to torsional resonance which causes oscillatory angular motion along the longitudinal axis of said arm assembly, a rigid mounting element for mounting said head arm assembly to a movable receiver structure disposed with a storage apparatus; a spring element coupled between said support element and said mounting element and pretensioned so that said arm assembly is constantly urged towards said storage medium, the portion of said spring element adjacent said rigid mounting element defining a fulcrum; a ramp structure formed asymmetrically in said support element for cooperating with a stationary cam, for loading and unloading said head arm assembly relative to said storage medium, said storage medium exerting a reactive force against said loaded magnetic transducer so as to impart oscillatory angular motion to said arm assembly along its longitudinal axis; and a compressible resilient polyurethane element having a measured hardness of substantially 65 Shore A durometer carried by said mounting element positioned adjacent said spring element along said fulcrum for dissipating energy, said angular motion of said spring element along its longitudinal axis compressing said resilient polyurethane element, thereby to minimize resonant effects along the longitudinal axis of said arm assembly while minimizing flying height variations of said magnetic transducer.
References Cited (Backward Citations)
US3184555A
Cited
US3034077A
Cited
US3465305A
Cited
US3544980A
Cited
US3579213A
Cited
US3531788A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-01-23 | 1976-07-24 | 1977-01-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-23 | 1980-07-24 | 1981-01-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-23 | 1984-07-24 | 1985-01-23 | $7700.00 | Window Closed / Lapsed |