US4476509A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thin film magnetic head and method of manufacturing the same
Assignee: Hitachi Ltd
•
Filing: 1982-02-17
•
Granted: 1984-10-09
•
Expires: 2002-02-17
Abstract
Abstract A thin film magnetic head is composed of a first thin film of a magnetic material deposited on a non-magnetic substrate. A V-like groove is formed in the first magnetic thin film with a depth reaching the non-magnetic substrate. One wall face of the V-like groove is deposited with a non-magnetic thin film, and the V-like groove is filled with a second magnetic thin film. A magnetic gap provided by the non-magnetic thin film is used as the magnetic head gap.
Inventors
- 👤 Katsuo Konishi
- 👤 Kanji Kawano
- 👤 Kohji Tamura
- 👤 Mitsuo Abe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 09:11
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/127; G11B5/31; G11B5/3109; G11B5/3116; G11B5/3163
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
330 words
A thin film magnetic head, comprising a substrate formed of a non-magnetic material, a first magnetic thin film formed on the substrate, a non-magnetic thin film formed on a part of the first magnetic thin film for forming a magnetic head gap, and a second magnetic thin film in contact with the non-magnetic thin film, a first groove formed, in a predetermined region of the first magnetic thin film, which has a depth reaching the non-magnetic substrate and is filled with the non-magnetic thin film and the second magnetic thin film, one portion of the first magnetic thin film located on one side of said first groove constituting a main magnetic path for a half of a magnetic head core, a wall of which constitutes a surface of the magnetic head gap, while the other portion of the first magnetic thin film located on the other side of said first groove constitutes an auxiliary magnetic path for the other half of said magnetic head core, the non-magnetic thin film being provided on at least the surface of the magnetic head gap, the second magnetic thin film being formed on the first magnetic thin film, and a further groove being formed in the second magnetic thin film, whose depth at the position of the magnetic head gap reaches at least the surface of said one portion of the first magnetic thin film, and the second magnetic thin film having one portion which is positioned on said one portion of the first magnetic film and constitutes an auxiliary magnetic path for the half of said magnetic core, and the other portion which is positioned on said other portion of the first magnetic film constituting a main magnetic path for the other half of said magnetic head core, whereby the magnetic head gap is formed between opposite end faces of said main magnetic path portions of the two magnetic thin films with the non-magnetic thin film being sandwiched between said opposite end faces.
Claim 2
Dependent Claim
330 words
A thin film magnetic head, comprising a substrate formed of a non-magnetic material, a first magnetic thin film formed on the substrate, a non-magnetic thin film formed on a part of the first magnetic thin film for forming a magnetic head gap, and a second magnetic thin film in contact with the non-magnetic thin film, a first groove formed, in a predetermined region of the first magnetic thin film, which has a depth reaching the non-magnetic substrate and is filled with the non-magnetic thin film and the second magnetic thin film, one portion of the first magnetic thin film located on one side of said first groove constituting a main magnetic path for a half of a magnetic head core, a wall of which constitutes a surface of the magnetic head gap, while the other portion of the first magnetic thin film located on the other side of said first groove constitutes an auxiliary magnetic path for the other half of said magnetic head core, the non-magnetic thin film being provided on at least the surface of the magnetic head gap, the second magnetic thin film being formed on the first magnetic thin film, and a further groove being formed in the second magnetic thin film, whose depth at the position of the magnetic head gap reaches at least the surface of said one portion of the first magnetic thin film, and the second magnetic thin film having one portion which is positioned on said one portion of the first magnetic film and constitutes an auxiliary magnetic path for the half of said magnetic core, and the other portion which is positioned on said other portion of the first magnetic film constituting a main magnetic path for the other half of said magnetic head core, whereby the magnetic head gap is formed between opposite end faces of said main magnetic path portions of the two magnetic thin films with the non-magnetic thin film being sandwiched between said opposite end faces.
Claim 3
Dependent Claim
109 words
A thin film magnetic head comprising: a substrate formed of a non-magnetic material; a first magnetic thin film formed on said substrate; a groove formed in said first magnetic thin film at a predetermined region and provided with two walls reaching said non-magnetic substrate; a non-magnetic thin film formed on one wall of said groove; and a second magnetic thin film filled in said groove, wherein said non-magnetic thin film formed on one of said walls provides a magnetic head gap of the magnetic head and said first and second magnetic thin films located on both sides of said magnetic head gap provide core components of the magnetic head.
Claim 4
Dependent Claim
109 words
A thin film magnetic head comprising: a substrate formed of a non-magnetic material; a first magnetic thin film formed on said substrate; a groove formed in said first magnetic thin film at a predetermined region and provided with two walls reaching said non-magnetic substrate; a non-magnetic thin film formed on one wall of said groove; and a second magnetic thin film filled in said groove, wherein said non-magnetic thin film formed on one of said walls provides a magnetic head gap of the magnetic head and said first and second magnetic thin films located on both sides of said magnetic head gap provide core components of the magnetic head.
Claim 5
Dependent Claim
26 words
A thin film magnetic head according to claim 2, wherein said first and magnetic thin film is composed of at least two layers of thin films.
Claim 6
Dependent Claim
20 words
A thin film magnetic head according to claim 2 or 3, wherein cross-section of said groove presents a V-like shape.
Claim 7
Dependent Claim
44 words
A thin film magnetic head according to claim 2 or 3, wherein said first and second magnetic thin films are formed of a magnetic material selected from the group consisting of Sendust, Permalloy and amorphous material containing iron, cobalt and nickel as primary components.
Claim 8
Dependent Claim
281 words
A thin film magnetic head, comprising: a substrate formed of a non-magnetic material; a first magnetic thin film formed on a surface of said substrate and having a first groove of which one wall surface constitutes a magnetic gap surface and which has a depth reaching to at least said surface of the substrate so that a portion of said first magnetic thin film located on one side of said first groove constitutes a main magnetic path for a half of a magnetic head core, while the other portion of said first magnetic thin film located on the other side of said first groove constitutes an auxiliary magnetic path for the other half of said magnetic head core; a non-magnetic thin film formed on at least one wall surface of said first groove; a second magnetic thin film formed on said first magnetic thin film deposited with said non-magnetic thin film and having a second groove whose depth at the position of said magnetic head gap reaches at least the surface of the portion of said first magnetic thin film which constitutes said main magnetic path, said second magnetic thin film having one portion which constitutes an auxiliary magnetic path for the half of said magnetic head core and the other portion which constitutes a main magnetic path for the other half of said magnetic head core, said second groove being interposed between said one and other portions of said second magnetic thin film, wherein the magnetic head gap is formed between opposite end faces of said main magnetic path portions of said first and second magnetic thin films with said non-magnetic thin film being sandwiched between said opposite end faces.
Claim 9
Dependent Claim
281 words
A thin film magnetic head, comprising: a substrate formed of a non-magnetic material; a first magnetic thin film formed on a surface of said substrate and having a first groove of which one wall surface constitutes a magnetic gap surface and which has a depth reaching to at least said surface of the substrate so that a portion of said first magnetic thin film located on one side of said first groove constitutes a main magnetic path for a half of a magnetic head core, while the other portion of said first magnetic thin film located on the other side of said first groove constitutes an auxiliary magnetic path for the other half of said magnetic head core; a non-magnetic thin film formed on at least one wall surface of said first groove; a second magnetic thin film formed on said first magnetic thin film deposited with said non-magnetic thin film and having a second groove whose depth at the position of said magnetic head gap reaches at least the surface of the portion of said first magnetic thin film which constitutes said main magnetic path, said second magnetic thin film having one portion which constitutes an auxiliary magnetic path for the half of said magnetic head core and the other portion which constitutes a main magnetic path for the other half of said magnetic head core, said second groove being interposed between said one and other portions of said second magnetic thin film, wherein the magnetic head gap is formed between opposite end faces of said main magnetic path portions of said first and second magnetic thin films with said non-magnetic thin film being sandwiched between said opposite end faces.
Claim 10
Dependent Claim
31 words
A thin film magnetic head according to claim 6, wherein at least one of said first and second magnetic thin films is composed of two or more layers of laminar films.
Claim 11
Dependent Claim
20 words
A thin film magnetic head according to claim 6 or 7, wherein said first groove is of a V-like cross-section.
Claim 12
Dependent Claim
46 words
A thin film magnetic head according to claim 8, wherein said V-like groove has a wall face which is disposed in opposition to the wall face constituting a part of said magnetic head gap with an angle of inclination not greater than 20° to said substrate.
Claim 13
Dependent Claim
123 words
A thin film magnetic head comprising a substrate formed on a non-magnetic material; a first magnetic thin film formed on said substrate; a groove formed in said first magnetic thin film at a predetermined region and having two walls the extend to said non-magnetic substrate; a non-magnetic thin film formed on at least one said two walls of said groove; and a second magnetic thin film filled in said groove over said non-magnetic thin film, said non-magnetic thin film formed on at least one of said walls of the groove providing a magnetic head gap of the magnetic head and said first and second magnetic thin films located on each side of a magnetic head gap providing core components of the magnetic head.
Claim 14
Dependent Claim
123 words
A thin film magnetic head comprising a substrate formed on a non-magnetic material; a first magnetic thin film formed on said substrate; a groove formed in said first magnetic thin film at a predetermined region and having two walls the extend to said non-magnetic substrate; a non-magnetic thin film formed on at least one said two walls of said groove; and a second magnetic thin film filled in said groove over said non-magnetic thin film, said non-magnetic thin film formed on at least one of said walls of the groove providing a magnetic head gap of the magnetic head and said first and second magnetic thin films located on each side of a magnetic head gap providing core components of the magnetic head.
References Cited (Backward Citations)
US4127884A
Cited
JPS55132519A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-10-09 | 1988-04-09 | 1988-10-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-10-09 | 1992-04-09 | 1992-10-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-10-09 | 1996-04-09 | 1996-10-09 | $7700.00 | Window Closed / Lapsed |