US3987485A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic head with thin film components
Assignee: Panasonic Holdings Corp
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Filing: 1974-02-13
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Granted: 1976-10-19
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Expires: 1994-02-13
Abstract
Abstract A flux sensitive magnetic head is disclosed which comprises conductive electrodes formed contiguous to the principal surface of a semiconductor substrate at a predetermined spacing, the electrodes being formed by evaporating or diffusing a conductive material on or into the substrate, and a flux sensitive element bridging the electrodes. This head may have a small size and is suited for constructing multi-track heads.
Inventors
- 👤 Hiroshi Sugaya
- 👤 Takeshi Ishihara
- 👤 Fukashi Kobayashi
- 👤 Kenji Kanai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 01:19
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/127; G11B5/33; G11B5/37; G11B5/48; G11B5/49; G11B5/4907
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
89 words
Magnetic head apparatus comprising a semiconductor substrate having a principal surface and an end face; a plurality of spaced electrodes diffused into the principal surface of said substrate and extending substantially perpendicular to the end face of said substrate, each of said electrodes having a surface substantially coplanar with the principal surface of said substrate; and a ferromagnetic thin film presenting a magneto-resistive effect bridging said electrodes and contacting portions of the surfaces thereof, one edge of said thin film being contiguous with the end face of said substrate.
Claim 2
Dependent Claim
89 words
Magnetic head apparatus comprising a semiconductor substrate having a principal surface and an end face; a plurality of spaced electrodes diffused into the principal surface of said substrate and extending substantially perpendicular to the end face of said substrate, each of said electrodes having a surface substantially coplanar with the principal surface of said substrate; and a ferromagnetic thin film presenting a magneto-resistive effect bridging said electrodes and contacting portions of the surfaces thereof, one edge of said thin film being contiguous with the end face of said substrate.
Claim 3
Dependent Claim
25 words
Magnetic head apparatus according to claim 1, wherein said ferromagnetic thin film is anisotropic in the direction bridging said electrodes parallel to said end face.
Claim 4
Dependent Claim
26 words
Magnetic head apparatus according to claim 1, wherein said electrodes are connected to a reproducing circuit formed as a semiconductor integrated circuit on said semiconductor substrate.
Claim 5
Dependent Claim
31 words
Magnetic head apparatus according to claim 1, wherein said thin film is formed atop said semiconductor substrate along one side thereof and contiguous to one end of each of said electrodes.
Claim 6
Dependent Claim
135 words
Magnetic head apparatus comprising a semiconductor substrate having a principal surface and an end face; a first electrode diffused into the surface of said semiconductor substrate and having a portion extending along said end face; a plurality of second spaced electrodes diffused into the principal surface of said substrate extending substantially perpendicular to the end face thereof, an end of each of said second electrodes being spaced a predetermined distance from the portion of said first electrode extending along said end face of said substrate, each of said electrodes having a surface substantially coplanar with the principal surface of said substrate; and a plurality of ferromagnetic thin film elements presenting a magneto-resistive effect, each of said thin films extending between a corresponding second electrode and said first electrode and contacting portions of the surfaces thereof.
Claim 7
Dependent Claim
135 words
Magnetic head apparatus comprising a semiconductor substrate having a principal surface and an end face; a first electrode diffused into the surface of said semiconductor substrate and having a portion extending along said end face; a plurality of second spaced electrodes diffused into the principal surface of said substrate extending substantially perpendicular to the end face thereof, an end of each of said second electrodes being spaced a predetermined distance from the portion of said first electrode extending along said end face of said substrate, each of said electrodes having a surface substantially coplanar with the principal surface of said substrate; and a plurality of ferromagnetic thin film elements presenting a magneto-resistive effect, each of said thin films extending between a corresponding second electrode and said first electrode and contacting portions of the surfaces thereof.
Claim 8
Dependent Claim
72 words
Magnetic head apparatus as defined by claim 5 which further comprises a plurality of transistors each having first, second and third terminals, the first terminals of said transistors being connected to a common lead and the second terminal of each transistor being connected to a corresponding one of said plurality of second electrodes; and a shift register coupled to the third electrodes of said transistors for driving sequentially said flux sensitive elements.
Claim 9
Dependent Claim
126 words
Magnetic head apparatus for use with a recording medium comprising: a semiconductor substrate having a principal surface and an end face; a plurality of spaced electrodes diffused into the principal surface of said substrate and extending substantially perpendicular to the end face of said substrate, each of said electrodes having a surface substantially coplanar with the principal surface of said substrate; a ferromagnetic thin film presenting a magneto-resistive effect bridging said electrodes and contacting portions of the surfaces thereof, one edge of said thin film being contiguous with the end face of said substrate; and a magnetic core held in contact with said thin film, the signal flux from said recording medium passing through said thin film and extraneous magnetic flux passing through said magnetic core.
Claim 10
Dependent Claim
126 words
Magnetic head apparatus for use with a recording medium comprising: a semiconductor substrate having a principal surface and an end face; a plurality of spaced electrodes diffused into the principal surface of said substrate and extending substantially perpendicular to the end face of said substrate, each of said electrodes having a surface substantially coplanar with the principal surface of said substrate; a ferromagnetic thin film presenting a magneto-resistive effect bridging said electrodes and contacting portions of the surfaces thereof, one edge of said thin film being contiguous with the end face of said substrate; and a magnetic core held in contact with said thin film, the signal flux from said recording medium passing through said thin film and extraneous magnetic flux passing through said magnetic core.
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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) | 1979-10-19 | 1980-04-19 | 1980-10-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-10-19 | 1984-04-19 | 1984-10-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-10-19 | 1988-04-19 | 1988-10-19 | $7700.00 | Window Closed / Lapsed |