Patent US4253127A successfully refreshed from Google Patents.
US4253127A
Expired / Lapsed
US
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Magnetic head
Assignee: Olympus Corp
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Filing: 1979-03-15
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Granted: 1981-02-24
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Expires: 1999-03-15
Abstract
Abstract A magnetic head comprises a magnetic record/playback limb disposed in opposing relationship with the surface of a magnetic record medium, and a flux conducting limb coupled with the record/playback limb and adapted to be disposed in opposing relationship with a lateral end face of the medium.
Inventors
- 👤 Takashi Kodama
- 👤 Tuneo Yanagida
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 22:52
CPC Classifications
G; G11; G11B; G11B15/00; G11B15/60; G11B15/602; G11B5/00; G11B5/127; G11B5/1278
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
122 words
A magnetic head for use with a magnetic record medium including a layer of magnetizable material of a high permeability, a layer of magnetizable material disposed on one side of the high permeability layer and having an easy axis of magnetization in the direction of its thickness, and a film base disposed on the other side of the high permeability layer; the head comprising a magnetic record/playback limb disposed in opposing relationship with said one side of the medium, a magnetic head core coupled with the limb and including a flux conducting limb separate from said record/playback limb which is adapted to be disposed in opposing relationship with a lateral end face of the medium, and a coil disposed on the core.
Claim 2
Dependent Claim
122 words
A magnetic head for use with a magnetic record medium including a layer of magnetizable material of a high permeability, a layer of magnetizable material disposed on one side of the high permeability layer and having an easy axis of magnetization in the direction of its thickness, and a film base disposed on the other side of the high permeability layer; the head comprising a magnetic record/playback limb disposed in opposing relationship with said one side of the medium, a magnetic head core coupled with the limb and including a flux conducting limb separate from said record/playback limb which is adapted to be disposed in opposing relationship with a lateral end face of the medium, and a coil disposed on the core.
Claim 3
Dependent Claim
37 words
A magnetic head according to claim 1, including a pair of flux conducting limbs disposed on the opposite sides of the record/playback limb and disposed in opposing relationship with the both lateral end faces of the medium.
Claim 4
Dependent Claim
22 words
A magnetic head according to claim 2 in which the flux conducting limbs serve as guides for the medium as it runs.
Claim 5
Dependent Claim
112 words
A magnetic head for use with a magnetic record medium, said magnetic medium including top and bottom surfaces and side edges, said magnetic head comprising a magnetic head core having a coil disposed thereon, a magnetic record/playback element including an end face to be disposed adjacent the top surface of said medium, and a flux conducting element separate from said record/playback element to be disposed adjacent to one of the side edges of said medium so that the magnetic flux path produced passes only once through the top surface of said medium in a direction perpendicular thereto and only once through the side edge of said medium in a direction perpendicular thereto.
Claim 6
Dependent Claim
112 words
A magnetic head for use with a magnetic record medium, said magnetic medium including top and bottom surfaces and side edges, said magnetic head comprising a magnetic head core having a coil disposed thereon, a magnetic record/playback element including an end face to be disposed adjacent the top surface of said medium, and a flux conducting element separate from said record/playback element to be disposed adjacent to one of the side edges of said medium so that the magnetic flux path produced passes only once through the top surface of said medium in a direction perpendicular thereto and only once through the side edge of said medium in a direction perpendicular thereto.
Claim 7
Dependent Claim
59 words
A magnetic head in accordance with claim 4, wherein said medium includes an upper layer and a lower layer, and said magnetic flux path extends from the end face of said magnetic record/playback element through said upper layer to said lower layer and from said lower layer to the side edge of said medium to said flux conducting element.
Claim 8
Dependent Claim
116 words
A magnetic head for use with a magnetic record medium adapted to move in a longitudinal direction, said magnetic medium including top and bottom surfaces and side edges, said magnetic head comprising a magnetic head core having a coil disposed thereon, a magnetic record/playback element including a first end face to be disposed adjacent the top surface of said medium, and a flux-conducting element separate from said record/playback element including a second end face to be disposed adjacent to one of the side edges of said medium so that the magnetic flux path produced passes between said first and second end faces and through said magnetic record medium in a direction transverse to said longitudinal direction.
Claim 9
Dependent Claim
116 words
A magnetic head for use with a magnetic record medium adapted to move in a longitudinal direction, said magnetic medium including top and bottom surfaces and side edges, said magnetic head comprising a magnetic head core having a coil disposed thereon, a magnetic record/playback element including a first end face to be disposed adjacent the top surface of said medium, and a flux-conducting element separate from said record/playback element including a second end face to be disposed adjacent to one of the side edges of said medium so that the magnetic flux path produced passes between said first and second end faces and through said magnetic record medium in a direction transverse to said longitudinal direction.
References Cited (Backward Citations)
US2536030A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-02-24 | 1984-08-25 | 1985-02-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-02-24 | 1988-08-25 | 1989-02-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-02-24 | 1992-08-25 | 1993-02-24 | $7700.00 | Window Closed / Lapsed |