US3891995A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic head
Assignee: Hitachi Ltd
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Filing: 1973-09-04
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Granted: 1975-06-24
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Expires: 1993-09-04
Abstract
Abstract A magnetic head fabricated through the thin film technique and used with a magnetic drum or disk of an electronic computer. The magnetic head comprises a first magnetic material forming a part of a magnetic flux path; a second magnetic material forming another part of the magnetic flux path; at least two conductors superposed between the first and second magnetic materials, with insulating films inserted between the magnetic materials and the conductors and between the conductors; two lead conductors, one being connected with one end of the lowermost conductor and the other being connected with that end of the uppermost conductor which is opposite to the one end of the lowermost conductor; and coil forming conductors connected with the remaining ends of the conductors disposed between the first and second magnetic materials, wherein the coil forming conductors are insulated from each other but have the end portions where they are electrically connected in a predetermined manner, and wherein the coil forming conductors are substantially superposed on each other to form parts of turns of a coil.
Inventors
- 👤 Masanobu Hanazono
- 👤 Osamu Asai
- 👤 Kanji Kawakami
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 20:00
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/127; G11B5/31; G11B5/3109; G11B5/313
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
370 words
A magnetic head comprising: a first magnetic film and a second magnetic film disposed on a substrate, said first and second magnetic films forming a magnetic gap therebetween at one of the respective ends thereof, said gap lying substantially in a plane including an end surface of said substrate, said first and second magnetic films being magnetically coupled with each other at the other respective ends thereof; a plurality of electrically conductive films laid one upon another substantially on a given area on said substrate when seen in plan view, the lamination of said plurality of electrically conductive films traversing an area between said first and second magnetic films, said plurality of electrically conductive films being electrically insulated from one another and from said first and second magnetic films; a plurality of coil forming electrically conductive members including first, second, third and fourth portions, said first and second portions respectively extending from respective ends of respective ones of said plurality of electrically conductive films in a direction opposite to said end surface of said substrate, said third and fourth portions respectively extending toward each other from the respective extended ends of said first and second portions, said first and second portions being respectively laid one upon another substantially on respective given areas on said substrate, the respective extended ends of said third and fourth portions being electrically connected with each other outside of said area between said first and second magnetic films so that said plurality of electric conductive films are connected in series through said plurality of coil forming electrically conductive members to thereby form a continuous coil, the respective connections between said third and fourth portions being disposed, when seen in plan view and in the longitudinal direction of said lamination of said plurality of electrically conductive films, within a length which is obtained by moving in parallel the length of said lamination of said plurality of electrically conductive films and outside of said area between said first and second magnetic films; and a pair of lead-out electrically conductive members respectively connected to the two free ends of said continuous coil formed by said plurality of electrically conductive films and said plurality of coil forming electrically conductive members.
Claim 2
Dependent Claim
370 words
A magnetic head comprising: a first magnetic film and a second magnetic film disposed on a substrate, said first and second magnetic films forming a magnetic gap therebetween at one of the respective ends thereof, said gap lying substantially in a plane including an end surface of said substrate, said first and second magnetic films being magnetically coupled with each other at the other respective ends thereof; a plurality of electrically conductive films laid one upon another substantially on a given area on said substrate when seen in plan view, the lamination of said plurality of electrically conductive films traversing an area between said first and second magnetic films, said plurality of electrically conductive films being electrically insulated from one another and from said first and second magnetic films; a plurality of coil forming electrically conductive members including first, second, third and fourth portions, said first and second portions respectively extending from respective ends of respective ones of said plurality of electrically conductive films in a direction opposite to said end surface of said substrate, said third and fourth portions respectively extending toward each other from the respective extended ends of said first and second portions, said first and second portions being respectively laid one upon another substantially on respective given areas on said substrate, the respective extended ends of said third and fourth portions being electrically connected with each other outside of said area between said first and second magnetic films so that said plurality of electric conductive films are connected in series through said plurality of coil forming electrically conductive members to thereby form a continuous coil, the respective connections between said third and fourth portions being disposed, when seen in plan view and in the longitudinal direction of said lamination of said plurality of electrically conductive films, within a length which is obtained by moving in parallel the length of said lamination of said plurality of electrically conductive films and outside of said area between said first and second magnetic films; and a pair of lead-out electrically conductive members respectively connected to the two free ends of said continuous coil formed by said plurality of electrically conductive films and said plurality of coil forming electrically conductive members.
Claim 3
Dependent Claim
43 words
A magnetic head according to claim 1, in which said first and second portions of said plurality of coil forming electrically conductive members respectively extend from said respective ends of respective ones of said plurality of electrically conductive films substantially at right angles.
Claim 4
Dependent Claim
32 words
A magnetic head according to claim 1, in which the respective connections between said third and fourth portions are in alignment and are separated from one another when seen in plan view.
Claim 5
Dependent Claim
77 words
A magnetic head according to said claim 3, in which said first and second portions of said plurality of coil forming electrically conductive members respectively extend from respective ends of respective ones of said plurality of electrically conductive films in such a manner that an upper one of said respective first and second portions extends longer than an adjacent lower one of said respective first and second portions of said plurality of coil forming electrically conductive members.
Claim 6
Dependent Claim
88 words
A magnetic head according to claim 1, in which said first, second, third and fourth portions of said plurality of coil forming electrically conductive members are disposed substantially on respective given areas on said substrate when seen in plan view, and the connections between said third and fourth portions of said plurality of coil forming electrically conductive members are electrically insulated from one another and are disposed substantially one upon another on the path of said plurality of coil forming electrically conductive members when seen in plan view.
Claim 7
Dependent Claim
36 words
A magnetic head according to claim 5, in which said connections are disposed along the path of said plurality of coil forming electrically conductive members and are separated from one another when seen in plan view.
Claim 8
Dependent Claim
56 words
A magnetic head according to claim 6, in which said plurality of coil forming electrically conductive members are electrically insulated from one another by insulating films, and said connections between said third and fourth portions of said plurality of coil forming electrically conductive members are made through openings formed in given portions of said insulating films.
Claim 9
Dependent Claim
357 words
A magnetic head comprising: a magnetic film disposed on a ferrite substrate, said magnetic film forming a magnetic gap between said magnetic film and said substrate at one end of said magnetic film, said gap lying substantially in a plane including an end surface of said substrate, said magnetic film being magnetically coupled with said substrate at the other end of said magnetic film; a plurality of electrically conductive films laid one upon another substantially on a given area on said substrate when seen in plan view, the lamination of said plurality of electrically conductive films traversing an area under said magnetic film, said plurality of electrically conductive films being electrically insulated from one another and from said magnetic film and substrate; a plurality of coil forming electrically conductive members including first, second, third and fourth portions, said first and second portions respectively extending from respective ends of respective ones of said plurality of electrically conductive films in a direction opposite to said end surface of said substrate, said third and fourth portions respectively extending toward each other from the respective extended ends of said first and second portions, said first and second portions being respectively laid one upon another substantially on respective given areas on said substrate, the respective extended ends of said third and fourth portions being electrically connected with each other outside of said area under said magnetic film so that said plurality of electrically conductive films are connected in seriEs through said plurality of coil forming electrically conductive members to thereby form a continuous coil, the respective connections between said third and fourth portions being disposed, when seen in plan view and in the longitudinal direction of said lamination of said plurality of electrically conductive films, within a length which is obtained by moving in parallel the length of said lamination of said plurality of electrically conductive films and outside of said area under said magnetic film; and a pair of lead-out electrically conductive members respectively connected to the two free ends of said continuous coil formed by said plurality of electrically conductive films and said plurality of coil forming electrically conductive members.
Claim 10
Dependent Claim
357 words
A magnetic head comprising: a magnetic film disposed on a ferrite substrate, said magnetic film forming a magnetic gap between said magnetic film and said substrate at one end of said magnetic film, said gap lying substantially in a plane including an end surface of said substrate, said magnetic film being magnetically coupled with said substrate at the other end of said magnetic film; a plurality of electrically conductive films laid one upon another substantially on a given area on said substrate when seen in plan view, the lamination of said plurality of electrically conductive films traversing an area under said magnetic film, said plurality of electrically conductive films being electrically insulated from one another and from said magnetic film and substrate; a plurality of coil forming electrically conductive members including first, second, third and fourth portions, said first and second portions respectively extending from respective ends of respective ones of said plurality of electrically conductive films in a direction opposite to said end surface of said substrate, said third and fourth portions respectively extending toward each other from the respective extended ends of said first and second portions, said first and second portions being respectively laid one upon another substantially on respective given areas on said substrate, the respective extended ends of said third and fourth portions being electrically connected with each other outside of said area under said magnetic film so that said plurality of electrically conductive films are connected in seriEs through said plurality of coil forming electrically conductive members to thereby form a continuous coil, the respective connections between said third and fourth portions being disposed, when seen in plan view and in the longitudinal direction of said lamination of said plurality of electrically conductive films, within a length which is obtained by moving in parallel the length of said lamination of said plurality of electrically conductive films and outside of said area under said magnetic film; and a pair of lead-out electrically conductive members respectively connected to the two free ends of said continuous coil formed by said plurality of electrically conductive films and said plurality of coil forming electrically conductive members.
Claim 11
Dependent Claim
100 words
A magnetic head according to claim 8, in which said first and second portions of said plurality of coil forming electrically conductive members respectively extend from respective ends of respective ones of said plurality of electrically conductive films in such a manner that an upper one of said respective first and second portions extends longer than an adjacent lower one of said respective first and second portions of said plurality of coil forming electrically conductive members, and the respective connections between said third and fourth portions are in alignment and are separated from one another when seen in plan view.
Claim 12
Dependent Claim
104 words
A magnetic head according to claim 8, in which said first, second, third and fourth portions of said plurality of coil forming electrically conductive members are disposed substantially on respective given areas on said substrate when seen in plan view and are insulated from one another by insulating films, and the respective connections between said third and second portions of said plurality of coil forming electrically conductive members are made through openings formed in given portions of said insulating films and are disposed separately one from another on the path of said plurality of coil forming electrically conductive members when seen in plan view.
References Cited (Backward Citations)
US3564558A
Cited
US3611417A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-06-23 | 1978-12-23 | 1979-06-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-23 | 1982-12-23 | 1983-06-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-23 | 1986-12-23 | 1987-06-24 | $7700.00 | Window Closed / Lapsed |