US3718776A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multi-track overlapped-gap magnetic head, assembly
Assignee: International Business Machines Corp
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Filing: 1970-12-11
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Granted: 1973-02-27
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Expires: 1990-12-11
Abstract
Abstract A magnetic head reads and writes a plurality of information tracks, recorded as magnetization patterns on a magnetic recording medium, with two magnetic sheets mounted in a supporting frame. Complementary sheets each define a number of alternating three-sided and two-sided figures aligned along a subsequently formed head face. A gap-forming non-magnetic material is placed along one leg of each figure on one of the sheets, and the sheets are placed together, welded, encapsulated and ground to form a head. Preformed windings slip over one leg of each of the three-sided figures and preformed shielding cans surround the magnetic elements.
Inventors
- 👤 G Bate
- 👤 R Echelmeier
- 👤 L Everett
- 👤 G Taylor
- 👤 R Thornley
- 👤 W Kehr
- 👤 J Schaps
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 20:05
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/127; G11B5/147; G11B5/29; G11B5/31; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/4902; Y10T29/49021; Y10T29/49032; Y10T29/49036; Y10T29/49041; Y10T29/49048; Y10T29/49055; Y10T29/49059; Y10T29/4906; Y10T29/49066
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
133 words
A plural channel magnetic head assembly including, for each channel, a magnetic flux circuit, an electric winding, and an overlapped gap, comprising: a first continuous surface, in one plane, defining a plurality of seperable first magnetic flux circuit portions; a second continuous surface, in another plane separate from said first surface, designed to be placed in juxtaposition with said first surface, defining a plurality of separable second magnetic flux circuit portions defining the overlapped read/write gaps, said gaps completing the magnetic circuit for flux in the planes of the first and second surfaces respectively; a plurality of preformed windings, each winding associated with a magnetic circuit formed from the first and second portions by the juxtaposition of the first and second surfaces; and means for retaining the magnetic circuits and windings in position.
Claim 2
Dependent Claim
133 words
A plural channel magnetic head assembly including, for each channel, a magnetic flux circuit, an electric winding, and an overlapped gap, comprising: a first continuous surface, in one plane, defining a plurality of seperable first magnetic flux circuit portions; a second continuous surface, in another plane separate from said first surface, designed to be placed in juxtaposition with said first surface, defining a plurality of separable second magnetic flux circuit portions defining the overlapped read/write gaps, said gaps completing the magnetic circuit for flux in the planes of the first and second surfaces respectively; a plurality of preformed windings, each winding associated with a magnetic circuit formed from the first and second portions by the juxtaposition of the first and second surfaces; and means for retaining the magnetic circuits and windings in position.
Claim 3
Dependent Claim
28 words
The plural channel magnetic head assembly of Claim 1, wherein the windings are carried on a member connecting said first and second portions to form said magnetic circuits.
Claim 4
Dependent Claim
72 words
a second lamina defining, in an initial state, n-m winding carriers interspersed by m magnetic circuit-closing legs, each carrier and leg having a gap-forming portion; a gap-forming lamina for placement between the gap-forming portions of the first and second laminae to form m gaps, defined by the gap-forming portions of mated carriers and legs; means for connecting together each of the mated carriers with their opposing legs to complete each magnetic circuit.
Claim 5
Dependent Claim
72 words
a second lamina defining, in an initial state, n-m winding carriers interspersed by m magnetic circuit-closing legs, each carrier and leg having a gap-forming portion; a gap-forming lamina for placement between the gap-forming portions of the first and second laminae to form m gaps, defined by the gap-forming portions of mated carriers and legs; means for connecting together each of the mated carriers with their opposing legs to complete each magnetic circuit.
Claim 6
Dependent Claim
33 words
The head assembly as defined in claim 2, wherein the member comprises a composite material having magnetic sections for completing magnetic circuits and non-magnetic sections for isolating the magnetic circuits from each other.
Claim 7
Dependent Claim
60 words
A plural gap magnetic head, wherein all gaps of a write section are in one plane and all gaps of a read section are in another plane, comprising: mated lamina pairs forming separate magnetic paths and gaps, and carrying windings the axes of which are parallel to the gap plane for each of n channels, each mated lamina pair including:
Claim 8
Dependent Claim
60 words
A plural gap magnetic head, wherein all gaps of a write section are in one plane and all gaps of a read section are in another plane, comprising: mated lamina pairs forming separate magnetic paths and gaps, and carrying windings the axes of which are parallel to the gap plane for each of n channels, each mated lamina pair including:
Claim 9
Dependent Claim
18 words
The plural channel magnetic head of claim 4, wherein each winding is surrounded by a magnetic shielding cylinder.
Claim 10
Dependent Claim
22 words
The plural channel magnetic head of claim 4, wherein shielding means are mounted between mated lamina pairs for magnetically isolating the pairs.
Claim 11
Dependent Claim
43 words
The plural channel magnetic head of claim 4, wherein: each winding is surrounded by a magnetic shielding cylinder; shielding plates are mounted between mated lamina pairs; and support means connect the lamina pairs and shielding plates to structurally fasten them to each other.
Claim 12
Dependent Claim
169 words
A transducer assembly for reading and writing via magnetic gaps electric signals as a plurality of tracks of magnetic indicia on a recording medium in motion relative to said gaps, comprising: two sheets of magnetic material having an active head element middle section, supporting side sections, and a removable temporary supporting top section; one plural-legged appendage for each track forming the middle section of each sheet, two appendages forming a Head element for one track when the sheets are mated; a winding placed on one leg of one of the appendages for each track; a non-magnetic material in contact with a portion of all the appendages on one sheet to define a magnetic gap when the sheets are mated; a fastening contact connecting each two mated appendages for completing a magnetic circuit when the sheets are mated; and filling means for penetrating the interstices of the sheets to form a single physical entity of the mated sheets to facilitate removal of the top section and exposure of the gaps.
Claim 13
Dependent Claim
169 words
A transducer assembly for reading and writing via magnetic gaps electric signals as a plurality of tracks of magnetic indicia on a recording medium in motion relative to said gaps, comprising: two sheets of magnetic material having an active head element middle section, supporting side sections, and a removable temporary supporting top section; one plural-legged appendage for each track forming the middle section of each sheet, two appendages forming a Head element for one track when the sheets are mated; a winding placed on one leg of one of the appendages for each track; a non-magnetic material in contact with a portion of all the appendages on one sheet to define a magnetic gap when the sheets are mated; a fastening contact connecting each two mated appendages for completing a magnetic circuit when the sheets are mated; and filling means for penetrating the interstices of the sheets to form a single physical entity of the mated sheets to facilitate removal of the top section and exposure of the gaps.
Claim 14
Dependent Claim
12 words
The transducer assembly of Claim 8, wherein shielding material surrounds said coils.
Claim 15
Independent Claim
159 words
The method of forming a high-density multiple-track magnetic head, including the steps of: forming a first sheet of magnetic material carrying alternate three-section and two-section circuit portions arranged in a line; forming a second sheet of magnetic material, complementary to said first sheet so that juxtaposition of one three-section portion from one sheet and one two-section portion from the other sheet forms a closed magnetic circuit, with one section overlapping; applying a separating material to the overlapping sections of both portions of the first sheet to permit the establishment of a magnetic gap; slipping a winding over one section of each of the three-section circuit portions on both sheets; juxtaposing the two sheets to mate complementary portions and form magnetic circuits, each having a winding and a gap; fastening the complementary portions together to form a complete single-gap magnetic circuit; fixing the sheets in a predetermined position mechanically; and removing excess sheet material to expose the gap for utilization.
Claim 16
Independent Claim
159 words
The method of forming a high-density multiple-track magnetic head, including the steps of: forming a first sheet of magnetic material carrying alternate three-section and two-section circuit portions arranged in a line; forming a second sheet of magnetic material, complementary to said first sheet so that juxtaposition of one three-section portion from one sheet and one two-section portion from the other sheet forms a closed magnetic circuit, with one section overlapping; applying a separating material to the overlapping sections of both portions of the first sheet to permit the establishment of a magnetic gap; slipping a winding over one section of each of the three-section circuit portions on both sheets; juxtaposing the two sheets to mate complementary portions and form magnetic circuits, each having a winding and a gap; fastening the complementary portions together to form a complete single-gap magnetic circuit; fixing the sheets in a predetermined position mechanically; and removing excess sheet material to expose the gap for utilization.
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) | 1976-02-27 | 1976-08-28 | 1977-02-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-02-27 | 1980-08-28 | 1981-02-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-02-27 | 1984-08-28 | 1985-02-27 | $7700.00 | Window Closed / Lapsed |