US4768121A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic head formed by composite main pole film and winding core for perpendicular magnetic recording
Assignee: Alps Alpine Co Ltd
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Filing: 1986-12-31
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Granted: 1988-08-30
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Expires: 2006-12-31
Abstract
Abstract A magnetic head for perpendicular magnetic recording is disclosed which is composed of a substrate made of a non-magnetic material, a main pole film formed on the side surface of the substrate, a protective film for covering the main pole film, a winding core on which the substrate is pasted such that the main pole film is situated above the winding core, and a slider to which the winding core is secured through an adhesive.
Inventors
- 👤 Keishi Nakashima
- 👤 Tetsuya Iwata
- 👤 Yasuo Tanaka
- 👤 Toshiaki Hashidate
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 10:45
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/127; G11B5/1278
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
160 words
A main pole excitation type magnetic head for perpendicular magnetic recording on tracks of a recording medium moving in a horizontal direction in contact therewith, comprising: a slider having a horizontal medium-contacting surface on one side thereof; a magnetic head formed as a thin film composite of a non-magnetic substrate layer, a main pole film layer for perpendicular magentic recording having a predetermined width corresponding to the width of tracks to be recorded, and a protective film layer, said thin film magnetic head being oriented in parallel with the horizontal direction of the recording medium with the protective film layer on a leading end relative to a moving direction of the recording medium; a winding core formed separately from said magnetic head of a magnetic material, said winding core being secured to the slider with an adhesive and having said thin film magnetic head pasted to an end surface thereof in horizontal alignment with said medium-contacting surface of said slider.
Claim 2
Dependent Claim
160 words
A main pole excitation type magnetic head for perpendicular magnetic recording on tracks of a recording medium moving in a horizontal direction in contact therewith, comprising: a slider having a horizontal medium-contacting surface on one side thereof; a magnetic head formed as a thin film composite of a non-magnetic substrate layer, a main pole film layer for perpendicular magentic recording having a predetermined width corresponding to the width of tracks to be recorded, and a protective film layer, said thin film magnetic head being oriented in parallel with the horizontal direction of the recording medium with the protective film layer on a leading end relative to a moving direction of the recording medium; a winding core formed separately from said magnetic head of a magnetic material, said winding core being secured to the slider with an adhesive and having said thin film magnetic head pasted to an end surface thereof in horizontal alignment with said medium-contacting surface of said slider.
Claim 3
Dependent Claim
68 words
A main pole excitation type magnetic head according to claim 1, wherein said slider has a pair of medium-contacting pads extending in the horizontal direction separated by an air groove, and said winding core is formed in a C-shape and secured to said slider perpendicular to the horizontal direction at a trailing end of one of said medium-contacting pads relative to the moving direction of the recording medium.
References Cited (Backward Citations)
US4441131A
Cited
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US4658314A
Cited
US4648087A
Cited
JPS6151615A
Cited
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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) | 1991-08-30 | 1992-02-29 | 1992-08-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-08-30 | 1996-02-29 | 1996-08-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-08-30 | 2000-02-29 | 2000-08-30 | $7700.00 | Window Closed / Lapsed |