US3668775A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for manufacturing magnetic heads
Assignee: Panasonic Holdings Corp
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Filing: 1970-02-09
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Granted: 1972-06-13
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Expires: 1990-02-09
Abstract
Abstract A method for manufacturing magnetic heads having the tape travel surface partially covered with a non-magnetic material, comprising the steps of mounting a head core with the front side including a gap of a predetermined width substantially identical with a predetermined tape travel surface in a mating recess of the same contour as the core front formed in a non-magnetic frame member, and grinding said head core and said frame member to expose part of the core front.
Inventors
- 👤 Minoru Morita
- 👤 Takashi Shiraki
- 👤 Sadao Masuoka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 11:31
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/127; G11B5/187; G11B5/1871; G11B5/29; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/4902; Y10T29/49021; Y10T29/49032; Y10T29/49036; Y10T29/49041; Y10T29/49048; Y10T29/49055
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
226 words
A method for manufacturing multi-track magnetic heads having a tape travel surface comprising the steps of joining two core halves of a magnetic material to form a core assembly with a magnetic gap of predetermined width positioned lengthwise of said assembly, grinding the side of the said core assembly that includes said gap into a contour substantially identical with the desired tape travel surface, mounting the ground core assembly in a frame member of a non-magnetic material such that said ground side including said gap closely fits a counter bottom surface of a recess formed in said frame member, bonding said core assembly to said frame member, forming notches in said core assembly while leaving said frame member integral, said notches having the same width as a predetermined track interval extending at right angles to said gap such that the inter-notch portions have a predetermined track width and extending into said gap to a depth greater than or equal to the required gap depth of the completed head, inserting a shield into each of said notches, bonding said shields in place, and grinding the core assembly, said shields and said frame member in a direction opposite to that from which said notches were formed such that said core assembly is divided into a plurality of individual tape heads with gaps exposed on said tape travel surface.
Claim 2
Independent Claim
226 words
A method for manufacturing multi-track magnetic heads having a tape travel surface comprising the steps of joining two core halves of a magnetic material to form a core assembly with a magnetic gap of predetermined width positioned lengthwise of said assembly, grinding the side of the said core assembly that includes said gap into a contour substantially identical with the desired tape travel surface, mounting the ground core assembly in a frame member of a non-magnetic material such that said ground side including said gap closely fits a counter bottom surface of a recess formed in said frame member, bonding said core assembly to said frame member, forming notches in said core assembly while leaving said frame member integral, said notches having the same width as a predetermined track interval extending at right angles to said gap such that the inter-notch portions have a predetermined track width and extending into said gap to a depth greater than or equal to the required gap depth of the completed head, inserting a shield into each of said notches, bonding said shields in place, and grinding the core assembly, said shields and said frame member in a direction opposite to that from which said notches were formed such that said core assembly is divided into a plurality of individual tape heads with gaps exposed on said tape travel surface.
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) | 1975-06-13 | 1975-12-13 | 1976-06-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-13 | 1979-12-13 | 1980-06-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-13 | 1983-12-13 | 1984-06-13 | $7700.00 | Window Closed / Lapsed |