US5012375A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Wide-write, narrow-read, single-gap magnetic head
Assignee: Mitsubishi Electric Corp
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Filing: 1989-09-01
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Granted: 1991-04-30
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Expires: 2009-09-01
Abstract
Abstract A magnetic head without an erase head, which includes a substantially U-shaped magnetic core with opposed end faces of a pair of legs forming a gap; and a magnetic material attached to one of the end faces to form a write read head with the other end face to write and read data from a recording medium. The magnetic material has a saturated flux density lower than that of the magnetic core. A read track width made by the magnetic material and the other end face is smaller than a write track width made by the opposed end faces.
Inventors
- 👤 Masaru Nishimura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 11:29
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/127; G11B5/187; G11B5/245; G11B5/2452; G11B5/265; G11B5/2652; G11B5/2654; G11B5/2655
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
83 words
A wide-write, narrow-read, single-gap magnetic head comprising: a substantially U-shaped magnetic core with opposed end faces of a pair of legs having a substantially equal width; and a magnetic material attached to one of said end faces to form a read gap with the other end face, said magnetic material having a saturated flux density lower than that of said magnetic core, and said read gap having a read track width smaller than a write track width made by said opposed end faces.
Claim 2
Dependent Claim
83 words
A wide-write, narrow-read, single-gap magnetic head comprising: a substantially U-shaped magnetic core with opposed end faces of a pair of legs having a substantially equal width; and a magnetic material attached to one of said end faces to form a read gap with the other end face, said magnetic material having a saturated flux density lower than that of said magnetic core, and said read gap having a read track width smaller than a write track width made by said opposed end faces.
Claim 3
Dependent Claim
24 words
The magnetic head of claim 1, which further comprises a non-magnetic material filled in edge portions of said end faces around said magnetic material.
Claim 4
Dependent Claim
12 words
The magnetic head of claim 2, wherein said non-magnetic material is glass.
Claim 5
Dependent Claim
44 words
The magnetic head of claim 1, wherein said magnetic material is formed in a substantially T-shape, with a center leg facing said the other end face to form a read gap which is narrower than a write gap formed by said opposed end faces.
Claim 6
Dependent Claim
32 words
The magnetic head of claim 1, which further comprises an underlayer provided between said end face and said magnetic material to thereby improve adhesion of said magnetic material to said end face.
References Cited (Backward Citations)
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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) | 1994-04-29 | 1994-10-29 | 1995-04-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-04-29 | 1998-10-29 | 1999-04-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-04-29 | 2002-10-29 | 2003-04-30 | $7700.00 | Window Closed / Lapsed |