Patent DE18147C successfully refreshed from Google Patents.
Patent US3751599A successfully refreshed from Google Patents.
US3751599A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic head having multiple head cores
Assignee: Victor Company of Japan Ltd
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Filing: 1971-11-22
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Granted: 1973-08-07
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Expires: 1991-11-22
Abstract
Abstract A multi-head core magnetic head comprises at least one head core having a gap of a relatively large gap width and at least two other head cores having gaps of gap width respectively smaller than that of said one head core. The at least two other head cores are disposed at positions at which they can trace a track made by the at least one head core on the magnetic tape and distances between the gap of the at least one head core and the respective gaps of the at least two other head cores are different from each other. These head cores are integrally assembled in a single shield case.
Inventors
- 👤 H Ogawa
- 👤 T Suzuki
- 👤 M Tanaka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 21:45
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/02; G11B5/127; G11B5/265
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
222 words
A multi-head core magnetic head comprising at least three head cores held integrally together wherein at least one of said head cores has a gap of a relatively large gap width, and at least two other head cores have gaps which are parallel to the gap of said at least one head core and of width smaller than the gap width of said at least one head core, said at least two other head cores being disposed at positions at which the respective gap thereof traces a track made on a magnetic tape by the gap of said at least one head core and the distance between the gap of said at least one head core and the gaps of said at least two other head cores are respectively different from each other, further comprising a first core holder half half for holding said at least one head core, a second core holder half for holding said at least two other head cores, a third core holder half which abuts against said second core holder half, a shield plate held between said first and third core holder halves for shielding said at least one head core from said at least two other head cores, and a single shield case for containing said first to third core holder halves and said shield plate.
Claim 2
Dependent Claim
222 words
A multi-head core magnetic head comprising at least three head cores held integrally together wherein at least one of said head cores has a gap of a relatively large gap width, and at least two other head cores have gaps which are parallel to the gap of said at least one head core and of width smaller than the gap width of said at least one head core, said at least two other head cores being disposed at positions at which the respective gap thereof traces a track made on a magnetic tape by the gap of said at least one head core and the distance between the gap of said at least one head core and the gaps of said at least two other head cores are respectively different from each other, further comprising a first core holder half half for holding said at least one head core, a second core holder half for holding said at least two other head cores, a third core holder half which abuts against said second core holder half, a shield plate held between said first and third core holder halves for shielding said at least one head core from said at least two other head cores, and a single shield case for containing said first to third core holder halves and said shield plate.
Claim 3
Dependent Claim
83 words
The multi-head core magnetic head as defined in claim 1 wherein said second core holder half has recessed portions of different depths for receiving said at least two other head cores, a dummy core in addition to the head core is inserted in the recessed portion other than one of the smallest depth and said second core holder half having said head cores and a dummy core inserted in said recessed portions has an abutting surface made in the form of a plane.
Claim 4
Dependent Claim
101 words
The multi-head core magnetic head as defined in claim 1 wherein one of said at least two other head cores has one head core half constituting the head core held by said second core holder and the other head core half by said third core holder, said second core holder having its abutting surface made in the form of a plane and said third core holder having its abutting surface abutting against said second core holder and the surface abutting against the shield plate on the opposite side thereof made in the form of planes which are parallel to each other.
Claim 5
Dependent Claim
65 words
The multi-head core magnetic head as defined in claim 1 wherein said second core holder is formed with tapped holes extending from its side surface to the innermost surface of said recessed portions and said head cores inserted in said recessed portions are pushed by the tips of screws screwed in said tapped holes for adjusting the positions of the gaps of said head cores.
References Cited (Backward Citations)
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Cited
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US2674660A
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US3414971A
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US3564153A
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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) | 1976-08-06 | 1977-02-05 | 1977-08-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-06 | 1981-02-05 | 1981-08-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-06 | 1985-02-05 | 1985-08-07 | $7700.00 | Window Closed / Lapsed |