US4622613A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thin film magnetic head
Assignee: Panasonic Holdings Corp
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Filing: 1983-10-07
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Granted: 1986-11-11
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Expires: 2003-10-07
Abstract
Abstract In a magnetoresistive (MR) effect head, electrodes for supplying a current to an MR element and a bias current conductor are not exposed at a contact surface of the MR head which is brought into sliding contact with a magnetic recording medium, thus preventing surface roughening of the contact surface.
Inventors
- 👤 Noboru Nomura
- 👤 Kenji Kanai
- 👤 Nobuyuki Kaminaka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 16:38
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/127; G11B5/33; G11B5/39; H; H10; H10N; H10N50/00; H10N50/10
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
90 words
A thin film magnetic head comprising a magnetoresistive effect element having a front tape contact edge, and at least two electrodes provided for said magnetoresistance effect element, said at least two electrodes being electrically and physically connected to said magnetoresistive effect element at a contact portion of said magnetoresistance element which is spaced rearwardly of said front contact edge of said magnetoresistive effect element such that said at least two electrodes do not extend to said front contact edge and as a consequence thereof deterioration of the electrodes is minimized.
Claim 2
Dependent Claim
90 words
A thin film magnetic head comprising a magnetoresistive effect element having a front tape contact edge, and at least two electrodes provided for said magnetoresistance effect element, said at least two electrodes being electrically and physically connected to said magnetoresistive effect element at a contact portion of said magnetoresistance element which is spaced rearwardly of said front contact edge of said magnetoresistive effect element such that said at least two electrodes do not extend to said front contact edge and as a consequence thereof deterioration of the electrodes is minimized.
Claim 3
Dependent Claim
50 words
A head according to claim 1, wherein said contact portion corresponds to two ends of said magnetoresistive effect element, said two ends being located at a side of said magnetoresistance effect element which opposes said front contact edge at which said thin film magnetic head contacts a magnetic recording medium.
Claim 4
Dependent Claim
113 words
A thin film magnetic head comprising a magnetoresistive effect element having a front tape contact edge, a metal conductor layer formed on at least a portion of a major surface of said magnetoresistance effect element; and an electrode electrically and physically connected to a portion of said metal conductor layer extending from said magnetoresistive effect element so as to constitute a first contact portion, and a second contact portion between said electrode and said magnetoresistive effect element being spaced rearwardly from the front contact edge of said magnetoresistance effect element, such that said electrode does not extend to said front contact edge and as a consequence thereof deterioration of the electrodes is minimized.
Claim 5
Dependent Claim
113 words
A thin film magnetic head comprising a magnetoresistive effect element having a front tape contact edge, a metal conductor layer formed on at least a portion of a major surface of said magnetoresistance effect element; and an electrode electrically and physically connected to a portion of said metal conductor layer extending from said magnetoresistive effect element so as to constitute a first contact portion, and a second contact portion between said electrode and said magnetoresistive effect element being spaced rearwardly from the front contact edge of said magnetoresistance effect element, such that said electrode does not extend to said front contact edge and as a consequence thereof deterioration of the electrodes is minimized.
Claim 6
Dependent Claim
31 words
A head according to claim 3, wherein said metal conductor layer has a flat surface, and said major surface of said magnetoresistance effect element is entirely situated on said flat surface.
Claim 7
Dependent Claim
17 words
A head according to claim 4, wherein said metal conductor layer has a part which is oxidized.
Claim 8
Dependent Claim
37 words
A head according to any one of claims 3 to 5, wherein said metal conductor layer comprises at least one element selected from the group consisting of metals having a Mohs hardness value of 4 to 9.
Claim 9
Dependent Claim
42 words
A head according to any one of claims 3 to 5, wherein said metal conductor layer comprises at least one element selected from the group consisting of metals belonging to Groups IIIa, IVa, Va, VIa, VIIa and VIII of the Periodic Table.
Claim 10
Dependent Claim
31 words
A head according to any one of claims 3 to 5, wherein said metal conductor layer comprises at least one element selected from the group consisting of molybdenum, titanium and tungsten.
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) | 1989-11-10 | 1990-05-12 | 1990-11-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-11-10 | 1994-05-12 | 1994-11-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-11-10 | 1998-05-12 | 1998-11-11 | $7700.00 | Window Closed / Lapsed |