Patent US3696218A successfully refreshed from Google Patents.
US3696218A
Expired / Lapsed
US
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Magnetic flux-responsive heads
Assignee: Sony Corp
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Filing: 1970-08-31
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Granted: 1972-10-03
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Expires: 1990-08-31
Abstract
Abstract An improved dual-gap magnetic flux-responsive head which can be used not only for detecting reference magnetizations previously formed but also for making the reference magnetizations on a magnetic medium. The improved head has respective coil members on its magnetic core and yoke assembly for producing magnetic flux to detect the magnetizations and to make the magnetizations.
Inventors
- 👤 Saburo Uemura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 14:46
CPC Classifications
G; G01; G01D; G01D5/00; G01D5/12; G01D5/14; G01D5/20; G01D5/2006; G01D5/2033; G11; G11B; G11B5/00; G11B5/127; G11B5/187; G11B5/245; G11B5/2452; G11B5/33
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
120 words
A magnetic flux-responsive head comprising a saturable magnetic core with a plurality of coils wound thereon, means for energizing said coils to produce magnetic flux in opposite directions along said core, a magnetic yoke assembly forming, with said core disposed therebetween, a loop path for magnetic flux and having two gaps defined between the opposite sides of one end portion of said core and adjacent ends of said yoke assembly, and magnetic means including additional coil means for producing a magnetic flux which passes through said one end portion of the core in the direction extending between said opposite sides so as to saturate said one end portion and include the latter in a single effective gap to form magnetizations.
Claim 2
Dependent Claim
120 words
A magnetic flux-responsive head comprising a saturable magnetic core with a plurality of coils wound thereon, means for energizing said coils to produce magnetic flux in opposite directions along said core, a magnetic yoke assembly forming, with said core disposed therebetween, a loop path for magnetic flux and having two gaps defined between the opposite sides of one end portion of said core and adjacent ends of said yoke assembly, and magnetic means including additional coil means for producing a magnetic flux which passes through said one end portion of the core in the direction extending between said opposite sides so as to saturate said one end portion and include the latter in a single effective gap to form magnetizations.
Claim 3
Dependent Claim
67 words
A magnetic flux-responsive head as claimed in claim 1, wherein said additional coil means is wound on at least one portion of said magnetic yoke assembly forming a loop path for magnetic flux, with magnetic flux produced by said additional coil means circulating in said magnetic yoke assembly and producing no resultant magnetic flux in said core in thE direction between the opposite ends of the latter.
Claim 4
Dependent Claim
45 words
A magnetic flux-responsive head as claimed in claim 2 wherein said additional coil means wound on the magnetic yoke assembly comprises a pair of coil members respectively wound on different portions of said magnetic yoke assembly, said coil members being electrically connected to each other.
Claim 5
Dependent Claim
73 words
A magnetic flux-responsive head as claimed in claim 1 wherein said magnetic flux producing means further comprises an additional magnetic yoke assembly forming a loop path for magnetic flux and surrounding said magnetic yoke assembly, said additional magnetic yoke assembly having said single effective gap defined between adjacent ends thereof with said one end portion of the core extending therebetween, and said additional coil means is wound on said additional magnetic yoke assembly.
Claim 6
Dependent Claim
31 words
A magnetic flux-responsive head as claimed in claim 4 wherein said single effective gap defined by said additional yoke assembly is aligned with said two gaps of said magnetic yoke assembly.
Claim 7
Dependent Claim
47 words
A magnetic flux-responsive head as claimed in claim 4, wherein a portion of said magnetic yoke assembly which, with said one end portion of the core, defines said two gaps extends into said single effective gap defined between said adjacent ends of the additional magnetic yoke assembly.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-10-03 | 1976-04-03 | 1976-10-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-03 | 1980-04-03 | 1980-10-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-03 | 1984-04-03 | 1984-10-03 | $7700.00 | Window Closed / Lapsed |