US4531170A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Combination magnetic head
Assignee: Toshiba Corp
•
Filing: 1982-05-13
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Granted: 1985-07-23
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Expires: 2002-05-13
Abstract
Abstract A combination magnetic head is formed with first and second gaps on a head face to be slidably contacted with a tape. The head face has first, second and third surface sections, the first and second surface sections are respectively formed on the first and second cores, and the third section is formed on a spacer for integrally coupling the first and second cores. The first and third surface sections decreases in the width toward the second surface section, the second surface section varies in the width, and the second surface section becomes at the minimum in the width in the vicinity of the gap of the second surface section.
Inventors
- 👤 Shushi Takei
- 👤 Akio Onuki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 06:44
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/127; G11B5/265; G11B5/2651; G11B5/187; G11B5/1871
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
187 words
A magnetic head comprising: a first core formed of magnetic material and having first surface section to be slidably contacted with a tape and first gap formed on the first surface section, a first winding provided on said first core, a second core formed of magnetic material and having second surface section to be slidably contacted with a tape and second gap formed on the second surface section, a second winding provided on said second core, said first and second cores defining a longitudinal direction, and a spacer interposed between said first and second cores to integrally coupled said first and second cores, said spacer having a third surface section to be slidably contacted with a tape and formed of non-magnetic material, the third surface section continuously arranged between the first and second surface sections to define a head face to be run with a tape, said head face including cut-away edge portions in a circular-arc-shape along the running direction of the tape, with said cut-away edge portions being dimensioned such that said first surface section has an area larger than that of said second surface section.
Claim 2
Dependent Claim
187 words
A magnetic head comprising: a first core formed of magnetic material and having first surface section to be slidably contacted with a tape and first gap formed on the first surface section, a first winding provided on said first core, a second core formed of magnetic material and having second surface section to be slidably contacted with a tape and second gap formed on the second surface section, a second winding provided on said second core, said first and second cores defining a longitudinal direction, and a spacer interposed between said first and second cores to integrally coupled said first and second cores, said spacer having a third surface section to be slidably contacted with a tape and formed of non-magnetic material, the third surface section continuously arranged between the first and second surface sections to define a head face to be run with a tape, said head face including cut-away edge portions in a circular-arc-shape along the running direction of the tape, with said cut-away edge portions being dimensioned such that said first surface section has an area larger than that of said second surface section.
Claim 3
Dependent Claim
23 words
A magnetic head according to claim 1, wherein said first and second surface sections each have a same length in the longitudinal direction.
Claim 4
Dependent Claim
49 words
A magnetic head according to claim 1, wherein each of said first and third surface sections has a width decreasing toward the second surface section and said second surface section has a width being changed along said longitudinal direction and being minimum at the vicinity of the second gap.
Claim 5
Dependent Claim
27 words
A magnetic head according to claim 1, wherein said first surface section has the area smaller than the twice of the area of the second surface section.
Claim 6
Dependent Claim
36 words
A magnetic head according to claim 1, wherein said first surface section has the area S I defined by the following formula, 1.3≦S.sub.I /S.sub.II ≦1.7 where S II represents the area of the second surface section.
Claim 7
Dependent Claim
56 words
A magnetic head according to claim 1, wherein said first core has a pair of recesses buried with non-magnetic material, said first gap is defined between a pair of the recesses, said second core has a pair of recesses buried with the non-magnetic material, and said second gap is defined between a pair of the recesses.
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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) | 1988-07-22 | 1989-01-21 | 1989-07-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-07-22 | 1993-01-21 | 1993-07-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-07-22 | 1997-01-21 | 1997-07-23 | $7700.00 | Window Closed / Lapsed |