US4750071A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic head assembly including a pair of heads disposed in the vicinity of each other
Assignee: Canon Electronics Inc
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Filing: 1986-08-26
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Granted: 1988-06-07
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Expires: 2006-08-26
Abstract
Abstract A magnetic head comprises a first magnetic core having a first gap on an exposed surface side; a second magnetic core having a second gap on an exposed surface side forming an identical surface with an exposed surface of the first magnetic core, and disposed in the vicinity of the first magnetic core; and a magnetic film disposed in the vicinity of the second magnetic core and for magnetically short-circuiting a magnetic circuit of the second magnetic core without passing through a coil wound around the second magnetic core. The magnetic film prevents crosstalk to the first magnetic core from the second magnetic core.
Inventors
- 👤 Minoru Kato
- 👤 Yumiko Hamanaka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 13:13
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/127; G11B5/187; G11B5/10; G11B5/265
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
183 words
A magnetic head assembly for use with a magnetic record bearing medium comprising (a) a first magnetic head including first and second core members; a first magnetic gap interposed between said first and second core members, said first magnetic gap having an exposed surface facing said magnetic record bearing medium; and a first coil wound around said first core member; (b) a second magnetic head disposed in the vicinity of said first magnetic head, said second magnetic head including third and fourth core members; a second magnetic gap interposed between said third and fourth core members, said second magnetic gap having an exposed surface facing said magnetic record bearing medium; and a second coil wound around said third core member, said second coil being adjacent the exposed surface of said second magnetic gap; and (c) a magnetic member contacting said third and fourth core members, said magnetic member being closer to the exposed surface of said second magnetic gap than said second coil, said magnetic member by-passing the magnetic circuit formed by said third and fourth core members and said second magnetic gap.
Claim 2
Dependent Claim
183 words
A magnetic head assembly for use with a magnetic record bearing medium comprising (a) a first magnetic head including first and second core members; a first magnetic gap interposed between said first and second core members, said first magnetic gap having an exposed surface facing said magnetic record bearing medium; and a first coil wound around said first core member; (b) a second magnetic head disposed in the vicinity of said first magnetic head, said second magnetic head including third and fourth core members; a second magnetic gap interposed between said third and fourth core members, said second magnetic gap having an exposed surface facing said magnetic record bearing medium; and a second coil wound around said third core member, said second coil being adjacent the exposed surface of said second magnetic gap; and (c) a magnetic member contacting said third and fourth core members, said magnetic member being closer to the exposed surface of said second magnetic gap than said second coil, said magnetic member by-passing the magnetic circuit formed by said third and fourth core members and said second magnetic gap.
Claim 3
Dependent Claim
24 words
A magnetic head assembly as claimed in claim 1, wherein said magnetic member is a magnetic film made from a high permeability magnetic material.
Claim 4
Dependent Claim
32 words
A magnetic head assembly as claimed in claim 1, further comprising a supporting member for supporting said first and said second magnetic cores, said magnetic member being disposed on said supporting member.
Claim 5
Dependent Claim
24 words
A magnetic head assembly as claimed in claim 3, wherein said magnetic member is a magnetic film made from a high permeability magnetic material.
Claim 6
Dependent Claim
41 words
A magnetic head assembly as claimed in claim 3, wherein said magnetic member is a magnetic thin plate made from a high permeability magnetic material, and wherein said supporting member has a groove in which said magnetic thin plate is disposed.
Claim 7
Dependent Claim
67 words
A magnetic head assembly as claimed in claim 1, wherein said first and second magnetic gaps are parallel with each other, said second magnetic gap is formed by two magnetic gaps sandwiching said first magnetic gap and extending in a direction parallel to the direction in which said first and second gaps extend, and wherein a spacer is located between said first and said second magnetic cores.
Claim 8
Dependent Claim
22 words
A magnetic head assembly as claimed in claim 1, further comprising a heating element disposed in the vicinity of said magnetic member.
Claim 9
Dependent Claim
19 words
A magnetic head assembly as claimed in claim 7, wherein said heating element is mounted on said magnetic member.
Claim 10
Dependent Claim
46 words
A magnetic head assembly as claimed in claim 1, wherein said first magnetic head is arranged to record and/or reproduce signals on and/or from said magnetic record bearing medium, and said second magnetic head is arranged to erase signals recorded on said magnetic record bearing medium.
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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) | 1991-06-07 | 1991-12-07 | 1992-06-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-06-07 | 1995-12-07 | 1996-06-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-06-07 | 1999-12-07 | 2000-06-07 | $7700.00 | Window Closed / Lapsed |