US3634632A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic recording device with printed circuit coils formed with the circuit sheet folded in concertina fashion
Assignee: STC PLC
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Filing: 1969-10-27
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Granted: 1972-01-11
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Expires: 1989-10-27
Abstract
Abstract The multihead recording device and a method of making same wherein a row of energization windings is constructed from a single printed circuit assembly of parallel wavy lines of conductor material on a nonmagnetizable sheet. The sheet is folded concertina fashion to form helices of the parallel wavy lines. A hole is made axially through each helix and a single core piece of magnetizable material is fitted therein. The assembly is thereafter encapsulated in a block of potting compound, with the end of each core and the last turn of the corresponding windings being flush with the recording surface of said block.
Inventors
- 👤 Christopher Alan Watson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:19
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/127; G11B5/1272; G03; G03G; G03G19/00; G11B5/17; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/4902; Y10T29/49021; Y10T29/49032; Y10T29/4906; Y10T29/49066; Y10T29/4908
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
155 words
A magnetic recording device having a recording surface arranged to be adjacent to a recording medium, comprising a plurality of rodlike cores of magnetizable material, a plurality of helical energizing windings through each one of which a separate one of said cores passes, and a support block of nonmagnetic material within which said cores and windings are encapsulated with at least one end of each core being flush with the recording surface thereof, the helical energizing windings being provided by a plurality of parallel undulating lines of conductive material formed on at least one major surface of a sheet of insulating material folded in concertina fashion with a pitch equal to the pitch or a multiple of the pitch of said undulating lines, the portions of the sheet of insulating material in the center of each one of said windings being provided with at least one through hole to facilitate the fitting of said cores.
Claim 2
Dependent Claim
155 words
A magnetic recording device having a recording surface arranged to be adjacent to a recording medium, comprising a plurality of rodlike cores of magnetizable material, a plurality of helical energizing windings through each one of which a separate one of said cores passes, and a support block of nonmagnetic material within which said cores and windings are encapsulated with at least one end of each core being flush with the recording surface thereof, the helical energizing windings being provided by a plurality of parallel undulating lines of conductive material formed on at least one major surface of a sheet of insulating material folded in concertina fashion with a pitch equal to the pitch or a multiple of the pitch of said undulating lines, the portions of the sheet of insulating material in the center of each one of said windings being provided with at least one through hole to facilitate the fitting of said cores.
Claim 3
Dependent Claim
50 words
A magnetic recording device as claimed in claim 1 wherein the said cores and windings are embedded in an epoxy resin potting compound, wherein the epoxy resin potting compound includes an amorphous silica filler material, and wherein the recording surface is covered with a thin film of wear resistance material.
Claim 4
Dependent Claim
81 words
A magnetic recording device as claimed in claim 2 wherein said rodlike cores are arranged in a row with one end of each core being flush with the recording surface, and wherein the recording device further includes a body of magnetic material embedded in said support block, said body extending longitudinally adjacent the row of cores at the recording surface with the surface of said body which faces said cores initially diverging from the cores and away from the recording surface.
References Cited (Backward Citations)
US2804506A
Cited
US3156919A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-01-10 | 1975-07-12 | 1976-01-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-10 | 1979-07-12 | 1980-01-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-10 | 1983-07-12 | 1984-01-11 | $7700.00 | Window Closed / Lapsed |