US4065797A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multi-element magnetic head
Assignee: Panasonic Holdings Corp
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Filing: 1975-12-16
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Granted: 1977-12-27
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Expires: 1995-12-16
Abstract
Abstract A multi-element made magnetic head having a plurality of magnetoresistive elements of a ferromagnetic material such as permalloy formed on a base of a ferromagnetic material such as ferrite is disclosed. The ferromagnetic material base is formed with a groove, which is common for all elements made extends parallel to the recording medium. It is filled with a non-magentic material such as glass, and the individual magnetoresistive elements are disposed so as to bridge the groove and are not adapted to be in direct frictional contact with the recording medium for reducing their wear. The magnetoresistive elements are also made to extend perpendicular to the recording medium so as to increase the head density or reduce the head pitch.
Inventors
- 👤 Noboru Nomura
- 👤 Kenji Kanai
- 👤 Nobuyuki Kaminaka
- 👤 Norimoto Nouchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 22:59
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/127; G11B5/33; G11B5/39; G11B5/3903; G11B5/3906; G11B5/3916; G11B5/3919; G11B5/3922; G11B5/3925; G11B23/00; G11B23/0007; G11B5/332
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
95 words
A multi-element magnetic head for use with a recording medium comprising a base composed of a ferromagnetic material, said base having a groove in the surface thereof filled with a non-magnetic material and extending parallel to a face of said base adapted for contact with said recording medium; and a plurality of magnetoresistive effect elements composed of a ferromagnetic material arranged on and bridging said groove, each said magnetoresistive effect element forming a magnetic circuit together with said ferromagnetic base, the resistance of said magnetoresistive effect element changing in accordance with an applied magnetic field.
Claim 2
Dependent Claim
95 words
A multi-element magnetic head for use with a recording medium comprising a base composed of a ferromagnetic material, said base having a groove in the surface thereof filled with a non-magnetic material and extending parallel to a face of said base adapted for contact with said recording medium; and a plurality of magnetoresistive effect elements composed of a ferromagnetic material arranged on and bridging said groove, each said magnetoresistive effect element forming a magnetic circuit together with said ferromagnetic base, the resistance of said magnetoresistive effect element changing in accordance with an applied magnetic field.
Claim 3
Dependent Claim
63 words
The multi-element magnetic head according to claim 1, which further comprises a plurality of flux converging cores and a plurality of electrodes composed of a conductive magnetic material, one of said flux converging cores being connected to an end of each of said magnetoresistive effect elements and one of said electrodes being connected to the other end of each of said magnetoresistive elements.
Claim 4
Dependent Claim
41 words
The multi-element magnetic head according to claim 1, which further comprises a non-magnetic conductive layer extending parallel to said groove adjacent all of said magnetoresistive effect elements, and insulating means interposed between said non-magnetic conductive layer and said magnetoresistive effect elements.
Claim 5
Dependent Claim
38 words
The multi-element magnetic head according to claim 1 wherein the ferromagnetic material comprising said base is a ferrite, the ferromagnetic material comprising said magnetoresistive effect element is permalloy and the non magnetic material filling said groove is glass.
Claim 6
Dependent Claim
19 words
The multi-element magnetic head according to claim 2 wherein said flux converging cores and electrodes are made of permalloy.
Claim 7
Dependent Claim
29 words
The multi-element magnetic head according to claim 2, wherein a non-magnetic conductive layer common to said magnetoresistive effect elements is buried in the non-magnetic insulating material filling said groove.
Claim 8
Dependent Claim
22 words
The multi-element magnetic head according to claim 1, wherein said plurality of magnetoresistive effect elements are electrically connected to a common electrode.
Claim 9
Dependent Claim
25 words
The multi-element magnetic head according to claim 2, wherein the electrodes connected to said respecitve magnetoresistive effect elements are electrically connected to a common electrode.
Claim 10
Dependent Claim
19 words
The multi-element magnetic head according to claim 7, wherein said common electrode is made of a conductive magnetic material.
Claim 11
Dependent Claim
19 words
The multi-element magnetic head according to claim 8, wherein said common electrode is made of a conductive magnetic material.
Claim 12
Dependent Claim
54 words
The multi-element magnetic head according to claim 1, wherein the face of said base for contacting the recording medium is located on one side of said groove, and a common electrode connected to one end of each of said magnetoresistive effect elements is provided on said base on the other side of said groove.
Claim 13
Dependent Claim
23 words
The multi-element magnetic head according to claim 3, wherein said non-magnetic conductive layer is buried in the non-magnetic insulating material filling said groove.
Claim 14
Dependent Claim
17 words
The multi-element magnetic head according to claim 12 wherein said non-magnetic insulating material is composed of glass.
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) | 1980-12-26 | 1981-06-27 | 1981-12-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-12-26 | 1985-06-27 | 1985-12-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-12-26 | 1989-06-27 | 1989-12-27 | $7700.00 | Window Closed / Lapsed |