Patent US3597836A successfully refreshed from Google Patents.
US3597836A
Expired / Lapsed
US
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Method of manufacturing a multichannel magnetic head
Assignee: Panasonic Holdings Corp
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Filing: 1969-05-08
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Granted: 1971-08-10
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Expires: 1989-05-08
Abstract
Abstract A multichannel magnetic head. The head has a plurality of magnetic tip cores which are separated magnetically from each other by nonmagnetic materials and each having a magnetic gap. A plurality of magnetic back cores are connected to said magnetic tip cores, and a plurality of windings are wound on said back cores. Certain of said plurality of magnetic gaps are aligned in one straight line and the remainder are aligned in another straight line. The two straight lines are perpendicular to the direction of tape movement of a recording and reproducing device. A method of making the multichannel head is to provide a magnetic plate and adhere to it stacks of alternating magnetic material and nonmagnetic material blocks. Thereafter, slots are cut at the joints between the blocks and nonmagnetic plates inserted in the slots. The resulting assembly is trimmed appropriately and back cores are attached to it and connected to the tip cores.
Inventors
- 👤 Takashi Tanaka
- 👤 Yasuo Nomura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 21:56
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/127; G11B5/29; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49004; Y10T29/4902; Y10T29/49021; Y10T29/49032; Y10T29/49048; Y10T29/49055; Y10T29/4906; Y10T29/49066
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
312 words
A method for making a multichannel magnetic head comprising: 1. providing a magnetic plate having major opposite surfaces which are smoothly polished and are parallel to each other; 2. providing a plurality of magnetic material parallelepipeds each of which has one surface smoothly polished and having at least one groove across the polished surface; 3. providing a plurality of nonmagnetic material parallelepipeds having a shape similar to that of said magnetic material parallelepipeds; 4. forming a composite body by adhering alternating magnetic material parallelepipeds and nonmagnetic material parallelepipeds to each other in two stacks, and adhering one stack to each of said major opposite surfaces of said magnetic plate with the polished surfaces on the magnetic material parallelepipeds opposed to the said major surfaces with a magnetic gap between said magnetic plate and each of said magnetic material parallelepipeds, a magnetic material parallelepiped on one side of said magnetic plate being opposite a nonmagnetic material parallelepiped on the other side of said magnetic plate and vice versa; 5. cutting slots having a parallelpipedal form and perpendicular to both the edge surface and the major surfaces of said magnetic plate at least at each of the boundary lines between said magnetic material parallelepipeds and said nonmagnetic material parallelepipeds, said slots each having a width corresponding to a space between adjacent tracks on a tape and a depth extending to the remote sidewall plane of said grooves in said magnetic material parallelepipeds; 6. inserting into said slots nonmagnetic plates having essentially the same size as said slots; 7. cutting the resultant composite body at said remote sidewall plane parallel to said edge surfaces of said magnetic plate to form a stack of a plurality of tip cores separated magnetically from each other by said inserted nonmagnetic plates; and 8. joining a plurality of magnetic back cores having windings thereon to the respective tip cores.
Claim 2
Independent Claim
312 words
A method for making a multichannel magnetic head comprising: 1. providing a magnetic plate having major opposite surfaces which are smoothly polished and are parallel to each other; 2. providing a plurality of magnetic material parallelepipeds each of which has one surface smoothly polished and having at least one groove across the polished surface; 3. providing a plurality of nonmagnetic material parallelepipeds having a shape similar to that of said magnetic material parallelepipeds; 4. forming a composite body by adhering alternating magnetic material parallelepipeds and nonmagnetic material parallelepipeds to each other in two stacks, and adhering one stack to each of said major opposite surfaces of said magnetic plate with the polished surfaces on the magnetic material parallelepipeds opposed to the said major surfaces with a magnetic gap between said magnetic plate and each of said magnetic material parallelepipeds, a magnetic material parallelepiped on one side of said magnetic plate being opposite a nonmagnetic material parallelepiped on the other side of said magnetic plate and vice versa; 5. cutting slots having a parallelpipedal form and perpendicular to both the edge surface and the major surfaces of said magnetic plate at least at each of the boundary lines between said magnetic material parallelepipeds and said nonmagnetic material parallelepipeds, said slots each having a width corresponding to a space between adjacent tracks on a tape and a depth extending to the remote sidewall plane of said grooves in said magnetic material parallelepipeds; 6. inserting into said slots nonmagnetic plates having essentially the same size as said slots; 7. cutting the resultant composite body at said remote sidewall plane parallel to said edge surfaces of said magnetic plate to form a stack of a plurality of tip cores separated magnetically from each other by said inserted nonmagnetic plates; and 8. joining a plurality of magnetic back cores having windings thereon to the respective tip cores.
Claim 3
Dependent Claim
25 words
providing a plurality of magnetic material parallelepipeds each of which has one surface smoothly polished and having at least one groove across the polished surface;
Claim 4
Dependent Claim
25 words
providing a plurality of magnetic material parallelepipeds each of which has one surface smoothly polished and having at least one groove across the polished surface;
Claim 5
Dependent Claim
18 words
providing a plurality of nonmagnetic material parallelepipeds having a shape similar to that of said magnetic material parallelepipeds;
Claim 6
Dependent Claim
18 words
providing a plurality of nonmagnetic material parallelepipeds having a shape similar to that of said magnetic material parallelepipeds;
Claim 7
Dependent Claim
93 words
forming a composite body by adhering alternating magnetic material parallelepipeds and nonmagnetic material parallelepipeds to each other in two stacks, and adhering one stack to each of said major opposite surfaces of said magnetic plate with the polished surfaces on the magnetic material parallelepipeds opposed to the said major surfaces with a magnetic gap between said magnetic plate and each of said magnetic material parallelepipeds, a magnetic material parallelepiped on one side of said magnetic plate being opposite a nonmagnetic material parallelepiped on the other side of said magnetic plate and vice versa;
Claim 8
Dependent Claim
93 words
forming a composite body by adhering alternating magnetic material parallelepipeds and nonmagnetic material parallelepipeds to each other in two stacks, and adhering one stack to each of said major opposite surfaces of said magnetic plate with the polished surfaces on the magnetic material parallelepipeds opposed to the said major surfaces with a magnetic gap between said magnetic plate and each of said magnetic material parallelepipeds, a magnetic material parallelepiped on one side of said magnetic plate being opposite a nonmagnetic material parallelepiped on the other side of said magnetic plate and vice versa;
Claim 9
Dependent Claim
72 words
cutting slots having a parallelpipedal form and perpendicular to both the edge surface and the major surfaces of said magnetic plate at least at each of the boundary lines between said magnetic material parallelepipeds and said nonmagnetic material parallelepipeds, said slots each having a width corresponding to a space between adjacent tracks on a tape and a depth extending to the remote sidewall plane of said grooves in said magnetic material parallelepipeds;
Claim 10
Dependent Claim
72 words
cutting slots having a parallelpipedal form and perpendicular to both the edge surface and the major surfaces of said magnetic plate at least at each of the boundary lines between said magnetic material parallelepipeds and said nonmagnetic material parallelepipeds, said slots each having a width corresponding to a space between adjacent tracks on a tape and a depth extending to the remote sidewall plane of said grooves in said magnetic material parallelepipeds;
Claim 11
Dependent Claim
14 words
inserting into said slots nonmagnetic plates having essentially the same size as said slots;
Claim 12
Dependent Claim
14 words
inserting into said slots nonmagnetic plates having essentially the same size as said slots;
Claim 13
Dependent Claim
40 words
cutting the resultant composite body at said remote sidewall plane parallel to said edge surfaces of said magnetic plate to form a stack of a plurality of tip cores separated magnetically from each other by said inserted nonmagnetic plates; and
Claim 14
Dependent Claim
40 words
cutting the resultant composite body at said remote sidewall plane parallel to said edge surfaces of said magnetic plate to form a stack of a plurality of tip cores separated magnetically from each other by said inserted nonmagnetic plates; and
Claim 15
Dependent Claim
15 words
joining a plurality of magnetic back cores having windings thereon to the respective tip cores.
Claim 16
Dependent Claim
15 words
joining a plurality of magnetic back cores having windings thereon to the respective tip cores.
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) | 1974-08-09 | 1975-02-08 | 1975-08-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-08-09 | 1979-02-08 | 1979-08-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-08-09 | 1983-02-08 | 1983-08-10 | $7700.00 | Window Closed / Lapsed |