Patent JPS589784A successfully refreshed from Google Patents.
Patent US4583143A successfully refreshed from Google Patents.
US4583143A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Wiring for thin film magnetic head
Assignee: Fujifilm Holdings Corp
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Filing: 1983-05-13
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Granted: 1986-04-15
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Expires: 2003-05-13
Abstract
Abstract A wiring configuration for thin film magnetic recording and reproducing heads. The inside end of the windings of the thin film magnetic recording head extends through an insulator to contact a bottom permalloy layer. A source of driving current is connected through a first conductor to the bottom permalloy layer and through a second conductor to the outside end of the windings. Thus, the windings of the thin film magnetic recording head are driven without the use of an overpass conductor. The bottom permalloy conductor can be divided so that the magnetic core formed by a first portion of the permalloy layer and the pole piece is insulated from a second portion of said bottom permalloy layer which receives the driving current.
Inventors
- 👤 Masatoshi Tabei
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 16:00
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/127; G11B5/31; G11B5/3103; G11B5/17; G11B5/3109; G11B5/313
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
210 words
A magnetic recording and reproducing thin film head, comprising: a substrate; a first conductor layer disposed on a surface of said substrate; a first insulating layer disposed on said first conductor layer; a second conductor layer disposed on said first insulating layer in the form of a discrete pancake coil of at least one turn defining a coil center, said coil having an inside end and an outside end, said inside end of said coil extending through said first insulating layer to contact said first conductor layer; a connecting pad disposed on said substrate and external to the outer periphery of said pancake coil; conductor means situated in the plane of said first conductor layer and electrically connected to said first conductor layer and said connecting pad for electrically connecting said inside end of said pancake coil to said connecting pad; a second insulating layer disposed on said second conductor layer; and a pole piece partially disposed over said second insulating layer, one end of said pole piece being in contact with said first conductor layer at the axial center of said coil, the other end of said pole piece cooperating with said first conductor layer and being separated therefrom by said first insulating layer to define a head gap.
Claim 2
Dependent Claim
210 words
A magnetic recording and reproducing thin film head, comprising: a substrate; a first conductor layer disposed on a surface of said substrate; a first insulating layer disposed on said first conductor layer; a second conductor layer disposed on said first insulating layer in the form of a discrete pancake coil of at least one turn defining a coil center, said coil having an inside end and an outside end, said inside end of said coil extending through said first insulating layer to contact said first conductor layer; a connecting pad disposed on said substrate and external to the outer periphery of said pancake coil; conductor means situated in the plane of said first conductor layer and electrically connected to said first conductor layer and said connecting pad for electrically connecting said inside end of said pancake coil to said connecting pad; a second insulating layer disposed on said second conductor layer; and a pole piece partially disposed over said second insulating layer, one end of said pole piece being in contact with said first conductor layer at the axial center of said coil, the other end of said pole piece cooperating with said first conductor layer and being separated therefrom by said first insulating layer to define a head gap.
Claim 3
Dependent Claim
58 words
The magnetic recording and reproducing thin film head as recited in claim 1, wherein said first conductor layer has first and second portions separated by said first insulating layer, said first portion of said first conductor layer being connected to said conductor means, and said second portion of said first conductor layer being connected to said pole piece.
Claim 4
Dependent Claim
22 words
The magnetic recording and reproducing thin film head as recited in claim 1, wherein said first conductor layer is comprised of permalloy.
Claim 5
Dependent Claim
21 words
The magnetic recording and reproducing thin film head as recited in claim 1, wherein said pole piece is comprised of permalloy.
Claim 6
Dependent Claim
37 words
The magnetic recording and reproducing has as recited in claim 1, further including another connecting pad and another conductor means, said another conductor means electrically connecting the outside end of said coil to said another connecting pad.
References Cited (Backward Citations)
US4353102A
Cited
US4423451A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-04-14 | 1989-10-14 | 1990-04-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-04-14 | 1993-10-14 | 1994-04-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-04-14 | 1997-10-14 | 1998-04-15 | $7700.00 | Window Closed / Lapsed |