Patent US3660892A successfully refreshed from Google Patents.
US3660892A
Expired / Lapsed
US
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Method for making a multi-channel magnetic head
Assignee: Panasonic Holdings Corp
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Filing: 1970-08-28
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Granted: 1972-05-09
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Expires: 1990-08-28
Abstract
Abstract A method of making a multi-channel magnetic head. A support plate having a flat surface is provided, and a magnetic core having a winding wound thereon is placed on said flat surface of said support plate in order to make an elementary unit. A plurality of said elementary units is stacked on one another, and said stacked elementary units are adhered to each other. The stack is cut into two halves in at least one plane which is perpendicular to the flat surfaces of said support plates and which divides each of the magnetic cores into two parts. The two halves are rejoined with a spacer between them with the core parts in one half matched with corresponding core parts in the other half.
Inventors
- 👤 Takashi Tanaka
- 👤 Yukihiro Yanagiuchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 21:56
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/127; G11B5/29; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/4902; Y10T29/49021; Y10T29/49032; Y10T29/49048; Y10T29/49055
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
155 words
A method of making a multi-channel magnetic head comprising: 1. providing a support plate having a flat surface, at least the flat surface being of non-magnetic material; 2. providing a magnetic core having a winding wound thereon; 3. placing said wound magnetic core on said flat surface of said support plate to make an elementary unit; 4. stacking a plurality of said elementary units one on the other; 5. adhering said stacked elementary units to each other; 6. cutting said stack into two halves in at least one plane which is perpendicular to said flat surfaces of said support plates and which divides each of said magnetic cores into two parts; 7. placing a spacer of non-magnetic material between said halves; and 8. rejoining said two halves at the plane of the cut with the spacer between them and with the core parts in one half matching the corresponding core parts in the other half.
Claim 2
Independent Claim
155 words
A method of making a multi-channel magnetic head comprising: 1. providing a support plate having a flat surface, at least the flat surface being of non-magnetic material; 2. providing a magnetic core having a winding wound thereon; 3. placing said wound magnetic core on said flat surface of said support plate to make an elementary unit; 4. stacking a plurality of said elementary units one on the other; 5. adhering said stacked elementary units to each other; 6. cutting said stack into two halves in at least one plane which is perpendicular to said flat surfaces of said support plates and which divides each of said magnetic cores into two parts; 7. placing a spacer of non-magnetic material between said halves; and 8. rejoining said two halves at the plane of the cut with the spacer between them and with the core parts in one half matching the corresponding core parts in the other half.
Claim 3
Dependent Claim
9 words
providing a magnetic core having a winding wound thereon;
Claim 4
Dependent Claim
9 words
providing a magnetic core having a winding wound thereon;
Claim 5
Dependent Claim
25 words
A method of making a multi-channel magnetic head as claimed in claim 1, wherein said magnetic core is a ring core having no gap therein.
Claim 6
Dependent Claim
41 words
A method of making a multi-channel magnetic head as claimed in claim 1, wherein said magnetic core consists of two core members which are joined with each other into a ring type core on said flat surface of said support plate.
Claim 7
Dependent Claim
18 words
placing said wound magnetic core on said flat surface of said support plate to make an elementary unit;
Claim 8
Dependent Claim
18 words
placing said wound magnetic core on said flat surface of said support plate to make an elementary unit;
Claim 9
Dependent Claim
11 words
stacking a plurality of said elementary units one on the other;
Claim 10
Dependent Claim
11 words
stacking a plurality of said elementary units one on the other;
Claim 11
Dependent Claim
52 words
A method of making a multi-channel magnetic head as claimed in claim 3, wherein said stacked elementary units are cut in two planes which are perpendicular to the support plates and parallel to each other so that each of the joints between said two core members is between said two parallel planes.
Claim 12
Dependent Claim
27 words
A method of making a multi-channel magnetic head as claimed in claim 3, wherein said two planes are spaced from 0.1 to 1.0 mm from each other.
Claim 13
Dependent Claim
8 words
adhering said stacked elementary units to each other;
Claim 14
Dependent Claim
8 words
adhering said stacked elementary units to each other;
Claim 15
Dependent Claim
33 words
cutting said stack into two halves in at least one plane which is perpendicular to said flat surfaces of said support plates and which divides each of said magnetic cores into two parts;
Claim 16
Dependent Claim
33 words
cutting said stack into two halves in at least one plane which is perpendicular to said flat surfaces of said support plates and which divides each of said magnetic cores into two parts;
Claim 17
Dependent Claim
10 words
placing a spacer of non-magnetic material between said halves; and
Claim 18
Dependent Claim
10 words
placing a spacer of non-magnetic material between said halves; and
Claim 19
Dependent Claim
32 words
rejoining said two halves at the plane of the cut with the spacer between them and with the core parts in one half matching the corresponding core parts in the other half.
Claim 20
Dependent Claim
32 words
rejoining said two halves at the plane of the cut with the spacer between them and with the core parts in one half matching the corresponding core parts in the other half.
References Cited (Backward Citations)
US3064333A
Cited
US3545077A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-05-09 | 1975-11-08 | 1976-05-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-09 | 1979-11-08 | 1980-05-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-09 | 1983-11-08 | 1984-05-09 | $7700.00 | Window Closed / Lapsed |