Patent US3686466A successfully refreshed from Google Patents.
US3686466A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Easily engageable magnetic head with visible gap aligning means
Assignee: Akai Electric Co Ltd
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Filing: 1970-09-09
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Granted: 1972-08-22
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Expires: 1990-09-09
Abstract
Abstract A magnetic head has a front head portion which is adapted to engage with a rear head portion. The rear head portion consists of a plurality of U-shaped core portions, a shield plate and a holder therefor. The front head portion comprises a stacked arrangement which includes a plurality of core tips and a shield plate therebetween. The stacked arrangement is surrounded by transparent or semitransparent wear resistant members. When the front head portion is engaged to the rear head portion by a rectangular shaped frame through which the front head portion passes, a plurality of closed magnetic paths will be formed by the abutting of each of the U-shaped core portions with a given one of the core tips.
Inventors
- 👤 Fujio Sato
- 👤 Ko Homma
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 20:14
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/127; G11B5/29; G11B5/10; G11B5/187; G11B5/255; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/4902; Y10T29/49021; Y10T29/49032; Y10T29/49055
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
151 words
A magnetic head comprising: a front head portion including a plurality of core tips, each of which has a gap therein, and a pair of at least semitransparent wear resistant members respectively arranged on the extreme outer surfaces of said core tips, said wear resistant members having a depth which is at least equal to the depth of the gap of said core tips; a rear head portion including a plurality of U-shaped core portions and means for holding said U-shaped core portions, the number of said U-shaped core portions being equal to the number of said core tips; and a mechanical and resilient engaging means attached to one of said front head portion and said rear head portion for arranging said front head portion to resiliently abut said rear head portion whereby a plurality of closed magnetic paths, each of which includes one of said plurality of gaps, are formed.
Claim 2
Dependent Claim
151 words
A magnetic head comprising: a front head portion including a plurality of core tips, each of which has a gap therein, and a pair of at least semitransparent wear resistant members respectively arranged on the extreme outer surfaces of said core tips, said wear resistant members having a depth which is at least equal to the depth of the gap of said core tips; a rear head portion including a plurality of U-shaped core portions and means for holding said U-shaped core portions, the number of said U-shaped core portions being equal to the number of said core tips; and a mechanical and resilient engaging means attached to one of said front head portion and said rear head portion for arranging said front head portion to resiliently abut said rear head portion whereby a plurality of closed magnetic paths, each of which includes one of said plurality of gaps, are formed.
Claim 3
Dependent Claim
45 words
A magnetic head as set forth in claim 1, wherein said front head portion further includes an additional pair of at least semi-transparent wear resistant members arranged on the leading and trailing sides of said core tips as viewed in the direction of tape travel.
Claim 4
Dependent Claim
59 words
A magnetic head as set forth in claim 2, wherein said front head portion still further includes a stacked structure positioned between said plurality of core tips; said stacked structure consisting of a shield plate for magnetically shielding said core tips and a pair of wear resistant members which are previously attached to both sides of said shield plate.
Claim 5
Dependent Claim
54 words
A magnetic head as set forth in claim 1, wherein said engaging means is provided with an opening for receiving said front head portion and includes two projections which extend outwardly from the opposite outer edges thereof, said projections serving to enable said rear portion to be fixedly engaged to said front head portion.
Claim 6
Dependent Claim
29 words
A magnetic head as set forth in claim 4, wherein said projections are bent in either an upward or a downward direction from the plane of said engaging means.
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) | 1975-08-22 | 1976-02-21 | 1976-08-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-22 | 1980-02-21 | 1980-08-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-22 | 1984-02-21 | 1984-08-22 | $7700.00 | Window Closed / Lapsed |