US3697705A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electromagnetic transducer recording head having a laminated core section and tapered gap
Assignee: California Institute of Technology
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Filing: 1969-07-24
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Granted: 1972-10-10
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Expires: 1989-07-24
Abstract
Abstract An electromagnetic transducer head is provided which exhibits a wide band recording response characteristic, and which comprises a plurality of separate magnetic head structures operating over different, overlapping frequency bands, and formed into an integral assembly. Each separate head structure of the assembly includes a magnetic core, and each core is provided with a gap. The cores are positioned adjacent one another so that the gaps are aligned to define a common gap, and the recording medium is drawn across the common gap. The common gap is tapered, with the gap width of each aligned gap section being different from its adjacent section. Separate windings are wound about the cores, each having different numbers of turns so as to cover overlapping frequency ranges.
Inventors
- 👤 Norman I Holt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 07:21
CPC Classifications
G; G11; G11B; G11B23/00; G11B23/0007; G11B5/00; G11B5/02; G11B5/127; H; H04; H04N; H04N5/00; H04N5/76; H04N5/78; H04N5/782
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
153 words
An electromagnetic transducer head having a wide-band frequency response, said head comprising: a plurality of core sections laminated together, each of said core sections being formed of a different ferromagnetic composition and each core section having a terped gap so that each core section is effective over a different predetermined frequency range, the gap of said core section at its narrowest end being as wide as the wide end of the gap in the adjacent section to said narrowest end of said core section and at its widest end being as wide as the narrow end of the gap in the adjacent section of said wide end of said core section so as to form a common continuous tapered gap in the laminate of said core sections; and a plurality of windings about said laminate of said core sections, each winding being responsive over a different one of said predetermined ranges of frequencies.
Claim 2
Dependent Claim
153 words
An electromagnetic transducer head having a wide-band frequency response, said head comprising: a plurality of core sections laminated together, each of said core sections being formed of a different ferromagnetic composition and each core section having a terped gap so that each core section is effective over a different predetermined frequency range, the gap of said core section at its narrowest end being as wide as the wide end of the gap in the adjacent section to said narrowest end of said core section and at its widest end being as wide as the narrow end of the gap in the adjacent section of said wide end of said core section so as to form a common continuous tapered gap in the laminate of said core sections; and a plurality of windings about said laminate of said core sections, each winding being responsive over a different one of said predetermined ranges of frequencies.
Claim 3
Dependent Claim
35 words
In the electromagnetic transducer head defined in claim 1, each of said plurality of windings having a different number of turns so as to be resonant over a different overlapping and successive band of frequencies.
Claim 4
Dependent Claim
62 words
In the electromagnetic transducer head defined in claim 1, each of said magnetic core sections being formed of a different ferromagnetic composition and each of said windings having an appropriate number of turns to make each of said respective windings resonant over a predetermined frequency range, the frequency ranges being those over which the respective ferromagnetic core compositions are also most effective.
Claim 5
Dependent Claim
23 words
The electromagnetic transducer head defined in claim 1, including a sintered vitreous separator formed in said tapered gap and incorporating a non-magnetic filler.
Claim 6
Dependent Claim
40 words
The electromagnetic transducer head defined in claim 1, in which said predetermined frequency ranges are overlapping at their respective limits, and in which each of said windings is positioned upon a different linear portion of the aforesaid laminated core assembly.
References Cited (Backward Citations)
US2469266A
Cited
US2538405A
Cited
US2822427A
Cited
US3080642A
Cited
US3526725A
Cited
US3372243A
Cited
US3304370A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-10-10 | 1976-04-10 | 1976-10-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-10 | 1980-04-10 | 1980-10-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-10 | 1984-04-10 | 1984-10-10 | $7700.00 | Window Closed / Lapsed |