US3684839A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic transducer head with separable pole tips
Assignee: Akai Electric Co Ltd
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Filing: 1970-10-20
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Granted: 1972-08-15
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Expires: 1990-10-20
Abstract
Abstract A magnetic head has a front head portion which is adapted to engage with a rear head portion. The front head portion has a front holder which includes a plurality of core tips and a plurality of front shield plate sections in spaced relationship to each other. The rear head portion has a rear holder which includes a plurality of U-shaped core portions and a plurality of rear shield plate sections in spaced relationship to each other. The number of U-shaped core portions provided is equal to the number of core tips. The rear holder is further provided with a plurality of pairs of holes, the same being widened at a frontward portion thereof, for fixedly retaining the U-shaped core portions and the rear shield plate sections therein. Each of the pairs of holes are interconnected by a slot which is also provided within the rear holder.
Inventors
- 👤 Ko Homma
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 19:03
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/127; G11B5/187; G11B5/10; G11B5/105; G11B5/29
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
343 words
A magnetic head comprising: a front head portion which includes a plurality of core tips, each of which has a gap therein, at least one front shield plate section between every adjacent core tip for magnetically shielding the same from each other, and a front holder for fixedly holding said core tips and said at least one front shield plate section in spaced relationship to each other; a rear head portion which includes a plurality of U-shaped core portions, at least one rear shield plate section between every adjacent U-shaped core portion for magnetically shielding the same from each other, and a rear holder for fixedly holding said U-shaped core portions and said at least one rear shield plate section in spaced relationship to each other, the number of said U-shaped core portions being equal to the number of said core tips and the number of said rear shield plate sections being equal to the number of said front shield plate sections; engaging means for arranging said front head portion to abut with said rear head portion whereby a plurality of closed magnetic paths, each of which includes one of said plurality of gaps, is formed; wherein each of said plurality of core tips and said at least one front shield plate section has an abutment face all lying in the same plane and which are fixedly held in said front holder for being capable of abutment with said U-shaped core portions and said at least one rear shield plate section, each of which has an abutment face lying in the same plane; and wherein the front face of said rear holder is provided with a plurality of slots and pairs of holes therein, said pairs of holes being for holding the front abutment ends of both of the legs of each of said U-shaped core portions and each of said slots connecting a given pair of holes and wherein said rear holder has a hole for holding the front abutment end of each of said at least one rear shield plate sections.
Claim 2
Dependent Claim
343 words
A magnetic head comprising: a front head portion which includes a plurality of core tips, each of which has a gap therein, at least one front shield plate section between every adjacent core tip for magnetically shielding the same from each other, and a front holder for fixedly holding said core tips and said at least one front shield plate section in spaced relationship to each other; a rear head portion which includes a plurality of U-shaped core portions, at least one rear shield plate section between every adjacent U-shaped core portion for magnetically shielding the same from each other, and a rear holder for fixedly holding said U-shaped core portions and said at least one rear shield plate section in spaced relationship to each other, the number of said U-shaped core portions being equal to the number of said core tips and the number of said rear shield plate sections being equal to the number of said front shield plate sections; engaging means for arranging said front head portion to abut with said rear head portion whereby a plurality of closed magnetic paths, each of which includes one of said plurality of gaps, is formed; wherein each of said plurality of core tips and said at least one front shield plate section has an abutment face all lying in the same plane and which are fixedly held in said front holder for being capable of abutment with said U-shaped core portions and said at least one rear shield plate section, each of which has an abutment face lying in the same plane; and wherein the front face of said rear holder is provided with a plurality of slots and pairs of holes therein, said pairs of holes being for holding the front abutment ends of both of the legs of each of said U-shaped core portions and each of said slots connecting a given pair of holes and wherein said rear holder has a hole for holding the front abutment end of each of said at least one rear shield plate sections.
Claim 3
Dependent Claim
335 words
A magnetic head comprising: a front head portion which includes a plurality of core tips, each of which has a gap therein, at least one front shield plate section between every adjacent core tip for magnetically shielding the same from each other, and a front holder for fixedly holding said core tips and said at least one front shield plate section in spaced relationship to each other; a rear head portion which includes a plurality of U-shaped core portions, at least one rear shield plate section between every adjacent U-shaped core portion for magnetically shielding the same from each other, and a rear holder for fixedly holding said U-shaped core portions and said at least one rear shield plate section in spaced relationship to each other, the number of said U-shaped core portions being equal to the number of said core tips and the number of said rear shield plate sections being equal to the number of said front shield plate sections; engaging means for arranging said front head portion to abut with said rear head portion whereby a plurality of closed magnetic paths, each of which includes one of said plurality of gaps, is formed; wherein each of said plurality of core tips and said at least one front shield plate section has an abutment face all lying in the same plane and which are fixedly held in said front holder for being capable of abutment with said U-shaped core portions and said at least one rear shield plate section, each of which has an abutment face lying in the same plane; and wherein the front face of said rear holder is provided with a plurality of pairs of holes therein for holding the front abutment ends of both of the legs of said U-shaped core portions therein and with a hole for holding the front abutment end of each of saId at least one rear shield plate sections and wherein said pairs of holes are widened at a portion of the rear holder.
Claim 4
Dependent Claim
335 words
A magnetic head comprising: a front head portion which includes a plurality of core tips, each of which has a gap therein, at least one front shield plate section between every adjacent core tip for magnetically shielding the same from each other, and a front holder for fixedly holding said core tips and said at least one front shield plate section in spaced relationship to each other; a rear head portion which includes a plurality of U-shaped core portions, at least one rear shield plate section between every adjacent U-shaped core portion for magnetically shielding the same from each other, and a rear holder for fixedly holding said U-shaped core portions and said at least one rear shield plate section in spaced relationship to each other, the number of said U-shaped core portions being equal to the number of said core tips and the number of said rear shield plate sections being equal to the number of said front shield plate sections; engaging means for arranging said front head portion to abut with said rear head portion whereby a plurality of closed magnetic paths, each of which includes one of said plurality of gaps, is formed; wherein each of said plurality of core tips and said at least one front shield plate section has an abutment face all lying in the same plane and which are fixedly held in said front holder for being capable of abutment with said U-shaped core portions and said at least one rear shield plate section, each of which has an abutment face lying in the same plane; and wherein the front face of said rear holder is provided with a plurality of pairs of holes therein for holding the front abutment ends of both of the legs of said U-shaped core portions therein and with a hole for holding the front abutment end of each of saId at least one rear shield plate sections and wherein said pairs of holes are widened at a portion of the rear holder.
Claim 5
Dependent Claim
24 words
A magnetic head as set forth in claim 2, wherein said pairs of holes are widened at the frontward portion of the rear holder.
Claim 6
Dependent Claim
67 words
A magnetic head as set forth in claim 2, wherein an adhesive is provided for retaining the said plurality of said U-shaped core portions within said pairs of holes and wherein any excess adhesive will fill within the widened front portion of said rear holder and thereby not interfere with lapping of the front abutment ends of said U-shaped core portions after insertion within said rear holder.
References Cited (Backward Citations)
US2915812A
Cited
US2861135A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-08-15 | 1976-02-14 | 1976-08-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-15 | 1980-02-14 | 1980-08-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-15 | 1984-02-14 | 1984-08-15 | $7700.00 | Window Closed / Lapsed |