US4286299A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic head assembly for recording or reproducing vertically magnetized records
Assignee: Fujifilm Holdings Corp
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Filing: 1979-10-11
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Granted: 1981-08-25
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Expires: 1999-10-11
Abstract
Abstract A magnetic head assembly for recording and playing back information on a recording medium in a vertically magnetized mode. Main and auxiliary heads are provided opposite one another with the recording medium passing therebetween. The main head includes a core of material exhibiting a magnetoresistance effect to which core are attached leads which carry the output play back signal. The auxiliary head has a magnetic core around which is wrapped a winding carrying the recording current. The recorded information patterns have their primary magnetic field components perpendicular to the surface of the recording medium.
Inventors
- 👤 Ryuji Shirahata
- 👤 Tatsuji Kitamoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:03
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/127; G11B5/33; G11B5/39; G11B5/3903; G11B5/1278
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
214 words
A magnetic head assembly for recording and reproducing information on a recording medium in the form of vertical magnetization patterns having a primary magnetic field component perpendicular to said recording medium comprising: a main head, said main head comprising a substrate, a member having a magnetoresistance effect provided on said substrate, and first and second lead terminals coupled to said member for detecting a variation of the resistance of said member, wherein said member comprises a body of material having a rectangular cross section at an end adjacent to and parallel with a surface of said recording medium and extending further in a direction perpendicular to the direction of movement of said recording medium than in a direction parallel to said direction of movement; and an auxiliary head disposed on an opposite side of said recording medium opposite said main head, said auxiliary head comprising a winding and a magnetic member for producing a magnetic field in response to a current in said winding, wherein said magnetic member has a rectangular cross section at an end adjacent to and parallel with an opposite surface of said recording medium and extending further in a direction perpendicular to the direction of movement of said recording medium than in a direction parallel to said direction of movement.
Claim 2
Dependent Claim
214 words
A magnetic head assembly for recording and reproducing information on a recording medium in the form of vertical magnetization patterns having a primary magnetic field component perpendicular to said recording medium comprising: a main head, said main head comprising a substrate, a member having a magnetoresistance effect provided on said substrate, and first and second lead terminals coupled to said member for detecting a variation of the resistance of said member, wherein said member comprises a body of material having a rectangular cross section at an end adjacent to and parallel with a surface of said recording medium and extending further in a direction perpendicular to the direction of movement of said recording medium than in a direction parallel to said direction of movement; and an auxiliary head disposed on an opposite side of said recording medium opposite said main head, said auxiliary head comprising a winding and a magnetic member for producing a magnetic field in response to a current in said winding, wherein said magnetic member has a rectangular cross section at an end adjacent to and parallel with an opposite surface of said recording medium and extending further in a direction perpendicular to the direction of movement of said recording medium than in a direction parallel to said direction of movement.
Claim 3
Dependent Claim
18 words
The magnetic head assembly of claim 1 further comprising a winding on said member having a magnetoresistance effect.
Claim 4
Dependent Claim
24 words
The magnetic head assembly of any of claims 1 or 2 wherein said member having a magnetoresistance effect comprises a body of Ni-Fe alloy.
Claim 5
Dependent Claim
20 words
The magnetic head assembly of any of claims 1 or 2 further comprising means for providing a bias magnetic field.
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) | 1984-08-24 | 1985-02-23 | 1985-08-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-08-24 | 1989-02-23 | 1989-08-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-08-24 | 1993-02-23 | 1993-08-25 | $7700.00 | Window Closed / Lapsed |