Patent US3881192A successfully refreshed from Google Patents.
US3881192A
Expired / Lapsed
US
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Magnetic recorder and printed circuit recording head therefor
Assignee: Northrop Grumman Innovation Systems LLC
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Filing: 1973-05-24
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Granted: 1975-04-29
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Expires: 1993-05-24
Abstract
Abstract A recorder includes a magnetic recording head with a plurality of projecting recording pins mounted in respective openings of a printed circuit board with printed circuit conductors on the board providing single-turn current carrying circuitry around each of the recording pins. A common reset and bias winding is wrapped around the projecting pins and is connected to a pair of edge connectors of the printed circuit board. The printed circuit conductors are connected in a coincident current matrix configuration with a recording pin at each matrix intersection to provide selection of the recording pins. A recorder uses the printing circuit board mounted adjacent to a recording medium responsive to the magnetic fields produced by selected ones of the recording pins.
Inventors
- 👤 Dale O Ballinger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 10:46
CPC Classifications
G; G03; G03G; G03G19/00; G06; G06K; G06K1/00; G06K1/12; G06K1/125; G11; G11B; G11B5/00; G11B5/127; G11B5/48; G11B5/49; G11B5/4969; G11B5/4976
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
190 words
A magnetic recording head comprising; an electrically insulating substrate having a predetermined pattern of apertures therein, a plurality of recording pins located in said apertures and projecting above an adjacent surface of said substrate, said recording pins each exhibiting an operating characteristic characterized by a rapid transition between magnetization levels at predetermined transition points along a B-H Curve representing an operation of said recording pins following a change in a magnetic field applied to a selected one of said recording pins, and current carrying means supported on said substrate and providing separate current carrying paths having an ampere-turn relationship with each of said recording pins, said current carrying paths being located on both sides of said substrate and including first circuit means interconnecting said current carrying paths on one side of said substrate to form rows of electrically interconnected recording pins and second circuit means located on the other side of said substrate and interconnecting current carrying paths on the same side of said substrate to form electrically interconnected columns of said recording pins whereby each of said recording pins is arranged at a corresponding intersection of an X-Y matrix.
Claim 2
Dependent Claim
190 words
A magnetic recording head comprising; an electrically insulating substrate having a predetermined pattern of apertures therein, a plurality of recording pins located in said apertures and projecting above an adjacent surface of said substrate, said recording pins each exhibiting an operating characteristic characterized by a rapid transition between magnetization levels at predetermined transition points along a B-H Curve representing an operation of said recording pins following a change in a magnetic field applied to a selected one of said recording pins, and current carrying means supported on said substrate and providing separate current carrying paths having an ampere-turn relationship with each of said recording pins, said current carrying paths being located on both sides of said substrate and including first circuit means interconnecting said current carrying paths on one side of said substrate to form rows of electrically interconnected recording pins and second circuit means located on the other side of said substrate and interconnecting current carrying paths on the same side of said substrate to form electrically interconnected columns of said recording pins whereby each of said recording pins is arranged at a corresponding intersection of an X-Y matrix.
Claim 3
Dependent Claim
31 words
A recording head as set forth in claim 1 wherein said insulating substrate is a sheet of electrically insulating material having a thickness less than the length of said recording pins.
Claim 4
Dependent Claim
42 words
A recording head as set forth in claim 2 wherein said recording pins project above adjacent surfaces of said substrate on both sides of said substrate and said bias winding encompasses all of said recording pins on one side of said substrate.
Claim 5
Dependent Claim
26 words
A recording head as set forth in claim 1 wherein said first and second means are printed circuit conductors arranged on respective surfaces of said substrate.
Claim 6
Dependent Claim
27 words
A recording head as set forth in claim 4 wherein said current carrying paths are printed circuit conductors printed on respective surfaces of said printed circuit board.
Claim 7
Dependent Claim
35 words
A recording head as set forth in claim 5 wherein said recording pins are arranged along parallel lines on said substrate and have a staggered relationship with respect to recording pins on adjacent parallel lines.
Claim 8
Dependent Claim
20 words
A recording head as set forth in claim 5 and including a bias winding encompassing all of said recording pins.
Claim 9
Dependent Claim
30 words
A recording head as set forth in claim 7 wherein said printed circuit conductors and said bias winding terminate in corresponding electrical connections on an edge of said insulating substrate.
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) | 1978-04-28 | 1978-10-28 | 1979-04-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-04-28 | 1982-10-28 | 1983-04-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-04-28 | 1986-10-28 | 1987-04-29 | $7700.00 | Window Closed / Lapsed |