US4901178A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thin film magnetic head
Assignee: Sony Corp
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Filing: 1987-02-13
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Granted: 1990-02-13
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Expires: 2007-02-13
Abstract
Abstract A thin film magnetic head whereby the inclined surface is formed with a prescribed angle relative to the upper surface of the substrate in the vicinity of a slide contact surface thereof with a magnetic recording medium, the magnetic gap is formed on the magnetic film on the inclined surface, and the azimuth of the magnetic gap is set by the inclined surface. By forming grooves or protrusions on the substrate, the inclined surface by which the azimuth of the magnetic gap is set is defined. A coil conductor is formed on the flat portion of the upper surface of the substrate. With the thin film magnetic head presented by this invention, a double azimuth thin film magnetic head of a multi-channel thin film magnetic head can be easily provided.
Inventors
- 👤 Tomio Kobayashi
- 👤 Iwao Abe
- 👤 Kazuo Kashiwa
- 👤 Yukihiro Aizawa
- 👤 Hiroyuki Suzukawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 17:12
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/127; G11B5/31; G11B5/3103; G11B5/3109; G11B5/3116; G11B5/3163; G11B5/48; G11B5/488; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/4902; Y10T29/49021; Y10T29/49032; Y10T29/49036; Y10T29/49043; Y10T29/49044; Y10T29/4906; Y10T29/49064
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
115 words
A thin film magnetic head including a magnetic substrate having a generally planar upper surface, a coil conductor and an upper magnetic film that are successively laminated on said upper generally planar surface of said magnetic substrate with the interposition of respective insulating films above and below said coil conductor, and at least one inclined surface formed on said substrate in the vicinity of a slide contact surface thereof with a magnetic recording medium, said inclined surface being inclined at a predetermined angle relative to said upper surface, said upper magnetic film being formed on said inclined surface for setting the azimuth of a magnetic gap formed between said substrate and said upper magnetic film.
Claim 2
Dependent Claim
115 words
A thin film magnetic head including a magnetic substrate having a generally planar upper surface, a coil conductor and an upper magnetic film that are successively laminated on said upper generally planar surface of said magnetic substrate with the interposition of respective insulating films above and below said coil conductor, and at least one inclined surface formed on said substrate in the vicinity of a slide contact surface thereof with a magnetic recording medium, said inclined surface being inclined at a predetermined angle relative to said upper surface, said upper magnetic film being formed on said inclined surface for setting the azimuth of a magnetic gap formed between said substrate and said upper magnetic film.
Claim 3
Dependent Claim
18 words
The structure set forth in claim 1 wherein said inclined surface comprises an inclined groove in said substrate.
Claim 4
Dependent Claim
17 words
The structure of claim 1 wherein said inclined surface comprises an inclined protrusion formed on said substrate.
Claim 5
Dependent Claim
119 words
A thin film magnetic head inclining a magnetic substrate having a generally planar upper surface, a lower magnetic film, a coil conductor, and an upper magnetic film that are successively laminated on said upper generally planar surface of said magnetic substrate with the interposition of respective insulating films above and below said coil conductor, and at least one inclined surface formed on said substrate in the vicinity of a sliding contact surface thereof with a magnetic recording medium, said surface being inclined at a predetermined angle relative to said upper surface, said lower and upper magnetic films being formed on said inclined surfaces to set the azimuth of a magnetic gap formed between said upper and lower magnetic films.
Claim 6
Dependent Claim
119 words
A thin film magnetic head inclining a magnetic substrate having a generally planar upper surface, a lower magnetic film, a coil conductor, and an upper magnetic film that are successively laminated on said upper generally planar surface of said magnetic substrate with the interposition of respective insulating films above and below said coil conductor, and at least one inclined surface formed on said substrate in the vicinity of a sliding contact surface thereof with a magnetic recording medium, said surface being inclined at a predetermined angle relative to said upper surface, said lower and upper magnetic films being formed on said inclined surfaces to set the azimuth of a magnetic gap formed between said upper and lower magnetic films.
Claim 7
Dependent Claim
17 words
The structure of claim 4 wherein said inclined surface comprises an inclined groove in said upper surface.
Claim 8
Dependent Claim
17 words
The structure of claim 4 wherein said inclined surface comprises an inclined protrusion on said upper surface.
Claim 9
Dependent Claim
22 words
A thin film magnetic head according to any one of claims 1, 2, 3, 4, 5 and 6 having one such gap.
Claim 10
Dependent Claim
40 words
A thin film magnetic head according to any one of claims 1, 2, 3, 4, 5 and 6 wherein plural magnetic gaps are formed in along a line which is normal to the travelling direction of the magnetic recording medium.
Claim 11
Dependent Claim
38 words
A thin film magnetic head according to any one of claims 1, 2, 3, 4, 5 and 6 including two such magnetic gaps that are arranged in staggered relation along the travelling direction of the magnetic recording medium.
Claim 12
Dependent Claim
20 words
A thin film magnetic head according to claim 9 wherein a shield layer is interposed between the confronting magnetic gaps.
Claim 13
Dependent Claim
56 words
A thin film magnetic head according to any one of claims 1, 2, 3, 4, 5 and 6 including a plurality of such magnetic gaps that are arranged in two rows in a direction normal to the travelling direction of the magnetic recording medium, with the confronting ones of the magnetic gaps scanning the same track.
Claim 14
Dependent Claim
20 words
A thin film magnetic head according to claim 11 wherein a shield layer is interposed between the confronting magnetic gaps.
Claim 15
Dependent Claim
58 words
A thin film magnetic head according to any one of the claims 1, 2, 3, 4, 5 and 6 including a plurality of such magnetic gaps that are arranged in two rows in a direction normal to the travelling direction of the magnetic recording medium, with the confronting ones of the magnetic gaps scanning the neighboring recording tracks.
Claim 16
Dependent Claim
20 words
A thin film magnetic head according to claim 13 wherein a shield layer is interposed between the confronting magnetic gaps.
Claim 17
Dependent Claim
21 words
A thin film magnetic head according to claims 3 or 6 wherein the inclined protrusions are formed with a magnetic material.
Claim 18
Dependent Claim
19 words
A thin film magnetic head according to claim 6 wherein said inclined protrusions are formed with a non-magnetic material.
Claim 19
Dependent Claim
34 words
A thin film magnetic head according to any one of claims 1, 2, 3, 4, 5 and 6 wherein the thin film coil conductor is formed on the flat portion of the magnetic substrate.
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) | 1993-02-12 | 1993-08-14 | 1994-02-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-02-12 | 1997-08-14 | 1998-02-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-02-12 | 2001-08-14 | 2002-02-13 | $7700.00 | Window Closed / Lapsed |