US4424542A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic head and method of producing same
Assignee: Pioneer Corp
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Filing: 1981-05-15
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Granted: 1984-01-03
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Expires: 2001-05-15
Abstract
Abstract A magnetic head for acoustic instruments. The head is composed of at least two units. Each unit, in turn, is composed of a shielding case half, a core holder, cores, etc. The core holder and/or the cores are easily positioned in the shielding case half at the time of assembly of the unit. The units are joined to each other to form a complete magnetic head.
Inventors
- 👤 Takashi Ujihara
- 👤 Akiyoshi Inoue
- 👤 Youzou Yamada
- 👤 Shinji Yasuda
- 👤 Shuji Takeda
- 👤 Takao Ioroi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 16:51
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/10; G11B5/11; G11B5/115; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/4902; Y10T29/49021; Y10T29/49032; Y10T29/49055
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
100 words
A magnetic head composed of at least two units, each unit comprising a shielding case half having a notched window formed therein; support means provided within said shielding case half; and at least one core supported by said support means within the shielding case half, one end portion of said core defining a gap surface, said gap surface extending outside of said shielding case half through said notched window, wherein at least two of said units are joined to each other such that said gap surface of one unit faces the gap surface of the core of an adjacent unit.
Claim 2
Dependent Claim
100 words
A magnetic head composed of at least two units, each unit comprising a shielding case half having a notched window formed therein; support means provided within said shielding case half; and at least one core supported by said support means within the shielding case half, one end portion of said core defining a gap surface, said gap surface extending outside of said shielding case half through said notched window, wherein at least two of said units are joined to each other such that said gap surface of one unit faces the gap surface of the core of an adjacent unit.
Claim 3
Dependent Claim
28 words
A magnetic head according to claim 1, wherein said at least two units comprises two units joined face to face with each other to form a single head.
Claim 4
Dependent Claim
57 words
A magnetic head according to claim 1, wherein said at least two units comprises two units joined back to back with each other and two further units, each of said further units being joined to one of said joined two units wherein a combination head is formed having a recording head section and a reproducing head section.
Claim 5
Dependent Claim
25 words
A magnetic head according to any of claims 1 to 3, wherein said support means includes a core holder fixed within the shielding case half.
Claim 6
Dependent Claim
28 words
A magnetic head according to any one of claims 1 to 3, wherein said support means includes a core holder molded integrally with the shielding case half therewithin.
Claim 7
Dependent Claim
33 words
A magnetic head according to any one of claims 1 to 3, wherein said support means includes a non-magnetic material selected from the group consisting of a synthetic resin and a diecasting zinc.
Claim 8
Dependent Claim
20 words
A magnetic head according to claim 1, wherein a spacer is provided between said facing gap surface of the cores.
References Cited (Backward Citations)
GB794978A
Cited
US3359629A
Cited
US3590168A
Cited
US3751599A
Cited
US3969770A
Cited
US3864753A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-01-02 | 1987-07-04 | 1988-01-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-01-02 | 1991-07-04 | 1992-01-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-01-02 | 1995-07-04 | 1996-01-03 | $7700.00 | Window Closed / Lapsed |