US4072993A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multi-element magnetic head
Assignee: Panasonic Holdings Corp
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Filing: 1975-11-07
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Granted: 1978-02-07
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Expires: 1995-11-07
Abstract
Abstract A multi-element magnetic head having a plurality of magnetic heads, in which a common electrode common to the coils of the individual heads is provided. By this construction the number of electrodes is reduced and also the area required for contact between leads from an external circuit and electrodes are reduced. Thus, it is made possible to reduce the head pitch of the magnetic heads.
Inventors
- 👤 Noboru Nomura
- 👤 Kenji Kanai
- 👤 Nobuyuki Kaminaka
- 👤 Norimoto Nouchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 21:44
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/127; G11B5/17; G11B5/31; G11B5/3109; G11B5/313; H; H10; H10W; H10W90/00
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
126 words
A multi-element magnetic head comprising a ferromagnetic material constituting a base; a yoke section including a plurality of thin plates made of a ferromagnetic material, each of said plates having a portion thereof in contact with said ferromagnetic base and arranged at the end thereof, said ferromagnetic base and each of said yoke sections forming a plurality of head gaps; a plurality of coils having first and second ends each made of a non-magnetic conductive layer and arranged adjacent each of said head gaps; and a common electrode layer commonly connected to the first end of each of said coils, said common electrode layer crossing the other end of each of said coils and being located on said base at a position remote from said gaps.
Claim 2
Dependent Claim
126 words
A multi-element magnetic head comprising a ferromagnetic material constituting a base; a yoke section including a plurality of thin plates made of a ferromagnetic material, each of said plates having a portion thereof in contact with said ferromagnetic base and arranged at the end thereof, said ferromagnetic base and each of said yoke sections forming a plurality of head gaps; a plurality of coils having first and second ends each made of a non-magnetic conductive layer and arranged adjacent each of said head gaps; and a common electrode layer commonly connected to the first end of each of said coils, said common electrode layer crossing the other end of each of said coils and being located on said base at a position remote from said gaps.
Claim 3
Dependent Claim
29 words
The multi-element magnetic head according to claim 1, wherein the width of each said yoke section (constituting the head track width) is greater than one half the head pitch.
Claim 4
Dependent Claim
24 words
The multi-element magnetic head according to claim 1, wherein the width of each said yoke section is less than one half the head pitch.
Claim 5
Dependent Claim
33 words
The multi-element magnetic head according to claim 1, wherein said common electrode layer has a comb-like form, an end of each said coil being connected to each tooth of said comb-like common electrode.
Claim 6
Dependent Claim
32 words
The multi-element magnetic head according to claim 1, wherein the sectional area of said common electrode layer is greater than the sum of the sectional areas of said coils in said gaps.
Claim 7
Dependent Claim
22 words
The multi-element magnetic head according to claim 1, wherein the ferromagnetic material constituting a base is provided on a non-magnetic base plate.
Claim 8
Dependent Claim
25 words
The multi-element magnetic head according to claim 1, wherein a non-magnetic conductive layer is provided in each of said head gaps via an insulating layer.
Claim 9
Dependent Claim
21 words
The multi-element magnetic head according to claim 7, wherein each of said non-magnetic conductive layers are adapted to carry bias current.
Claim 10
Dependent Claim
26 words
The multi-element magnetic head according to claim 8, wherein said non-magnetic conductive layers for application of the bias current are connected in series with one another.
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) | 1981-02-06 | 1981-08-08 | 1982-02-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-02-06 | 1985-08-08 | 1986-02-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-02-06 | 1989-08-08 | 1990-02-07 | $7700.00 | Window Closed / Lapsed |