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Patent US4851942A successfully refreshed from Google Patents.
US4851942A
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US
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Floating magnetic head having a magnetic core buried in a channel on an air bearing rail
Assignee: Hitachi Ltd
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Filing: 1987-09-14
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Granted: 1989-07-25
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Expires: 2007-09-14
Abstract
Abstract A core burying channel is formed on the outer side surface of an air bearing rail of a floating magnetic head floating on a magnetic disk by an air-flow in a direction perpendicular to a magnetic recording medium travelling direction, and a magnetic core is buried in this core burying channel. This magnetic head can be produced easily by a production method which forms a core burying channel in a non-magnetic block, then deposits a magnetic material to the core burying channel and removes unnecessary portions of the magnetic material.
Inventors
- 👤 Niroyuki Kumasaka
- 👤 Shigekazu Otomo
- 👤 Takeo Yamashita
- 👤 Noritoshi Saito
- 👤 Yokuo Saitoh
- 👤 Hiroshi Sakurai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 09:04
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/127; G11B5/1272; G11B5/10; G11B5/105; G11B5/187; G11B5/48; G11B5/58; G11B5/60; G11B5/6005
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
126 words
In a floating magnetic head of the type wherein a magnetic head core is provided on at least one air bearing rail of a floating member floating on a magnetic disk by an airflow, the improvement wherein said magnetic head core is buried in a core burying channel disposed on an outer side surface of said at least one air bearing rail, said outer side surface being substantially at a right angle to a surface facing a magnetic recording medium and being parallel to a magnetic recording medium travelling direction, said core burying channel being substantially at a right angle to said surface facing the magnetic recording medium, and wherein said magnetic head core is made of a thin film deposited in said core burying channel.
Claim 2
Dependent Claim
126 words
In a floating magnetic head of the type wherein a magnetic head core is provided on at least one air bearing rail of a floating member floating on a magnetic disk by an airflow, the improvement wherein said magnetic head core is buried in a core burying channel disposed on an outer side surface of said at least one air bearing rail, said outer side surface being substantially at a right angle to a surface facing a magnetic recording medium and being parallel to a magnetic recording medium travelling direction, said core burying channel being substantially at a right angle to said surface facing the magnetic recording medium, and wherein said magnetic head core is made of a thin film deposited in said core burying channel.
Claim 3
Dependent Claim
98 words
A floating magnetic head according to claim 1, wherein said floating member has two said air bearing rails on the outer portion thereof, a depth of said core burying channel corresponds substantially to a thickness of said magnetic head core, at least one of two core halves obtained by splitting said magnetic head core together with said floating member on a split surface perpendicular to the top surface of said air bearing rails and to a magnetic recording medium travelling direction has a winding window and said two core halves face each other through a non-magnetic gap member.
Claim 4
Dependent Claim
44 words
A floating magnetic head according to claim 1, wherein a edge portion of said magnetic head core in the magnetic recording medium travelling direction, when viewed from the side of said surface facing the magnetic recording medium is not parallel to a transducing gap.
Claim 5
Dependent Claim
42 words
A floating magnetic gap according to claim 1, wherein an exposed portion of a transducing gap on a side of a magnetic recording medium facing surface of said magnetic head core lies only inside the top surface of said air bearing rail.
Claim 6
Dependent Claim
30 words
A floating magnetic head according to claim 1, wherein non-magnetic material exists on at least one of side surfaces of said magnetic head core buried into said core burying channel.
Claim 7
Dependent Claim
27 words
A floating magnetic head according to claim 1, wherein a portion of said magnetic head core near a transducing gap is contracted corresponding to a track width.
References Cited (Backward Citations)
JPH06142720A
Cited
JPH06275927A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-07-24 | 1993-01-23 | 1993-07-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-07-24 | 1997-01-23 | 1997-07-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-07-24 | 2001-01-23 | 2001-07-25 | $7700.00 | Window Closed / Lapsed |