US4191980A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Transducers with tapered edge profiles and assembly thereof
Assignee: International Business Machines Corp
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Filing: 1978-12-29
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Granted: 1980-03-04
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Expires: 1998-12-29
Abstract
Abstract An assembly of a pair of magnetic transducers held in substantial contact with a flexible magnetic disk wherein each transducer has a pair of disk contacting lands broadening in contour toward the trailing end of the transducer and tapering in contour toward the leading end of the transducer, with the leading and side edges of each land being gradually blended into the surrounding active surface of the transducer and with the trailing edge of the land being sharp. A first one of the lands of each transducer has the read/write magnetic gap in it, and this land is located opposite the land of the other transducer not having the read/write gap in it which is wider than the first land. The centers of the opposite lands are in alignment, and the centers are measured on a plane passing through the read/write gaps of the transducers.
Inventors
- 👤 Francis K. King
- 👤 Ronald J. Maurine
- 👤 Donald J. Wanek
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 19:20
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/48; G11B5/58; G11B5/60; G11B5/6005; G11B5/127; G11B5/187; G11B5/1871
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
121 words
A magnetic transducer for use with a magnetic disk comprising: a transducer body having a pair of magnetically permeable core pieces extending therethrough, an active surface on said transducer body having a pair of lands adapted to contact or be in near contact with the magnetic disk as the disk rotates with said lands being separated by a groove extending longitudinally of said active surface, said core portions having a transducing gap therebetween on one of said lands on said active surface, each of said lands broadening longitudinally of said surface from a leading end of the transducer to the trailing end of the transducer whereby to modify the air pressure effective on the lands due to rotation of the disk.
Claim 2
Dependent Claim
121 words
A magnetic transducer for use with a magnetic disk comprising: a transducer body having a pair of magnetically permeable core pieces extending therethrough, an active surface on said transducer body having a pair of lands adapted to contact or be in near contact with the magnetic disk as the disk rotates with said lands being separated by a groove extending longitudinally of said active surface, said core portions having a transducing gap therebetween on one of said lands on said active surface, each of said lands broadening longitudinally of said surface from a leading end of the transducer to the trailing end of the transducer whereby to modify the air pressure effective on the lands due to rotation of the disk.
Claim 3
Dependent Claim
48 words
A transducer as set forth in claim 1, said lands each being defined by curved leading and trailing edges and by an outer edge, said leading and outer edges each being blended by curved surfaces into surrounding portions of said active surface and said trailing edge being sharp.
Claim 4
Dependent Claim
22 words
A transducer as set forth in claim 1, said land containing said transducing gap being narrower than the other of said lands.
Claim 5
Dependent Claim
189 words
An assembly of a pair of magnetic transducers, each of said transducers having an active surface with a relatively narrow land and a relatively wide land separated by a groove, means for holding said transducers positioned opposite each other with the wide land of one of the transducers opposite the narrow land of the other transducer so that a magnetic disk passing between said active surfaces of said transducers has the wide and narrow lands effective on opposite disk faces and directly opposite each other, and a pair of magnetically permeable core portions extending through one of said lands of each of said transducers and forming a magnetic gap on this land and on the active surface of the transducer, the center of said wide land of each of said transducers being positioned directly opposite the center of the narrow land of the other transducer, said center of each of said lands being located midway between the opposite edges of the land on the active surface of the transducer and on a plane containing said gap of the transducer and extending normal to said active surface of the transducer.
Claim 6
Dependent Claim
189 words
An assembly of a pair of magnetic transducers, each of said transducers having an active surface with a relatively narrow land and a relatively wide land separated by a groove, means for holding said transducers positioned opposite each other with the wide land of one of the transducers opposite the narrow land of the other transducer so that a magnetic disk passing between said active surfaces of said transducers has the wide and narrow lands effective on opposite disk faces and directly opposite each other, and a pair of magnetically permeable core portions extending through one of said lands of each of said transducers and forming a magnetic gap on this land and on the active surface of the transducer, the center of said wide land of each of said transducers being positioned directly opposite the center of the narrow land of the other transducer, said center of each of said lands being located midway between the opposite edges of the land on the active surface of the transducer and on a plane containing said gap of the transducer and extending normal to said active surface of the transducer.
Claim 7
Dependent Claim
38 words
A transducer assembly as set forth in claim 4, said magnetically permeable core portions extending through the narrow one of said lands of each of said transducers so as to provide their magnetic gap on the narrow land.
Claim 8
Dependent Claim
41 words
A transducer assembly as set forth in claim 4, each of said lands on each of said transducers broadening longitudinally on the active surface of the transducer from a leading end of the transducer to the trailing end of the transducer.
Claim 9
Dependent Claim
228 words
In combination, a flexible magnetic disk, means for drivingly rotating said disk, a pair of transducers, means for holding said transducers with active surfaces of the transducers in contact or near contact with opposite surfaces of the disk and said transducers being positioned opposite each other, the active surface of each of said transducers being defined by a relatively narrow land and a relatively wide land separated by a groove and said means for holding said transducers holding the wide land of one of the transducers opposite the narrow land of the other transducer so that said magnetic disk passing between said active surfaces of the transducers has the wide and narrow lands effective on opposite disk faces and directly opposite each other, and a pair of magnetically permeable core portions extending through one of said lands of each of said transducers and having a magnetic gap on this land and on said active surface of this transducer, the center of said wide land of each of said transducers being positioned directly opposite the center of the narrow land of the other transducer, said center of each of said lands being located midway between the opposite edges of the land on said active surface of the transducer having this land and on a plane containing said gap for the transducer and extending normally of its said active surface.
Claim 10
Dependent Claim
228 words
In combination, a flexible magnetic disk, means for drivingly rotating said disk, a pair of transducers, means for holding said transducers with active surfaces of the transducers in contact or near contact with opposite surfaces of the disk and said transducers being positioned opposite each other, the active surface of each of said transducers being defined by a relatively narrow land and a relatively wide land separated by a groove and said means for holding said transducers holding the wide land of one of the transducers opposite the narrow land of the other transducer so that said magnetic disk passing between said active surfaces of the transducers has the wide and narrow lands effective on opposite disk faces and directly opposite each other, and a pair of magnetically permeable core portions extending through one of said lands of each of said transducers and having a magnetic gap on this land and on said active surface of this transducer, the center of said wide land of each of said transducers being positioned directly opposite the center of the narrow land of the other transducer, said center of each of said lands being located midway between the opposite edges of the land on said active surface of the transducer having this land and on a plane containing said gap for the transducer and extending normally of its said active surface.
Claim 11
Dependent Claim
54 words
The combination as set forth in claim 7, said lands of each of said transducers broadening longitudinally of said active surface of the transducer from the leading end of the transducer to the trailing end of the transducer whereby to modify the air pressure effective on the lands due to rotation of the 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) | 1983-03-04 | 1983-09-03 | 1984-03-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-03-04 | 1987-09-03 | 1988-03-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-03-04 | 1991-09-03 | 1992-03-04 | $7700.00 | Window Closed / Lapsed |