US3672044A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multi-channel dual-gap magnetic head
Assignee: Panasonic Holdings Corp
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Filing: 1970-03-04
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Granted: 1972-06-27
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Expires: 1990-03-04
Abstract
Abstract A multi-channel dual-gap magnetic head. The head has a plurality of magnetic head tips which are separated magnetically from each other by non-magnetic materials and each having two magnetic gaps. A plurality of magnetic back cores are connected to said magnetic head tips, and a plurality of windings are wound on the respective back cores. The corresponding magnetic gaps in the head tips are aligned in two straight lines which are parallel to each other and perpendicular to the direction of tape movement of the tape for a recording and reproducing device. The magnetic gaps aligned in one straight line have at least two different gap widths. The method of making the multi-channel dual-gap head is to provide a magnetic plate and join to it a plurality of grooved magnetic material blocks by means of spacers of various thicknesses. Thereafter, slots are cut at the joints between the blocks, and non-magnetic plates are inserted in the slots. The resulting assembly is trimmed appropriately and back cores are attached and connected to the head tips.
Inventors
- 👤 Takashi Tanaka
- 👤 Yasuo Nomura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 07:29
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/127; G11B5/265; A; A24; A24F; A24F2700/00; A24F2700/03; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/4902; Y10T29/49021; Y10T29/49032; Y10T29/49048; Y10T29/49055
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
295 words
A method of making a multi-channel dual-gap magnetic head comprising, in the recited order, the steps of: 1. providing a magnetic plate having edge surfaces and having major opposite surfaces perpendicular thereto, which are smoothly polished and are substantially parallel to each other; 2. providing a plurality of magnetic material parallelepipeds on each side of said magnetic plate, each of which has one surface smoothly polished and has at least one groove in said polished surface; 3. inserting spacers of magnetic gap material between the grooved surfaces of said parallelepipeds and the surfaces of said magnetic plate, the spacers for adjacent parallelepipeds having different thicknesses, and joining said plurality of magnetic material parallelepipeds at the grooved surfaces to said two opposite surfaces of said magnetic plate by means of said spacers, said spacers acting as magnetic gaps; 4. cutting slots having a parallelepipedal form 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, said slots each having a width corresponding to a space between adjacent tracks on a tape and a depth extending from one edge surface of said magnetic plate and the corresponding surfaces of said magnetic material parallelepipeds to the remote side wall plane of said grooves in said magnetic material parallelepipeds; 5. inserting into said slots non-magnetic plates having essentially the same size as said slots; 6. cutting the resultant composite body at said remote side wall plane parallel to said edge surfaces of said magnetic plate to form a stack of a plurality of head tips separated magnetically from each other by said inserted non-magnetic plates; and 7. joining a plurality of magnetic back cores having windings thereon to the respective head tips.
Claim 2
Independent Claim
295 words
A method of making a multi-channel dual-gap magnetic head comprising, in the recited order, the steps of: 1. providing a magnetic plate having edge surfaces and having major opposite surfaces perpendicular thereto, which are smoothly polished and are substantially parallel to each other; 2. providing a plurality of magnetic material parallelepipeds on each side of said magnetic plate, each of which has one surface smoothly polished and has at least one groove in said polished surface; 3. inserting spacers of magnetic gap material between the grooved surfaces of said parallelepipeds and the surfaces of said magnetic plate, the spacers for adjacent parallelepipeds having different thicknesses, and joining said plurality of magnetic material parallelepipeds at the grooved surfaces to said two opposite surfaces of said magnetic plate by means of said spacers, said spacers acting as magnetic gaps; 4. cutting slots having a parallelepipedal form 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, said slots each having a width corresponding to a space between adjacent tracks on a tape and a depth extending from one edge surface of said magnetic plate and the corresponding surfaces of said magnetic material parallelepipeds to the remote side wall plane of said grooves in said magnetic material parallelepipeds; 5. inserting into said slots non-magnetic plates having essentially the same size as said slots; 6. cutting the resultant composite body at said remote side wall plane parallel to said edge surfaces of said magnetic plate to form a stack of a plurality of head tips separated magnetically from each other by said inserted non-magnetic plates; and 7. joining a plurality of magnetic back cores having windings thereon to the respective head tips.
Claim 3
Dependent Claim
32 words
providing a plurality of magnetic material parallelepipeds on each side of said magnetic plate, each of which has one surface smoothly polished and has at least one groove in said polished surface;
Claim 4
Dependent Claim
32 words
providing a plurality of magnetic material parallelepipeds on each side of said magnetic plate, each of which has one surface smoothly polished and has at least one groove in said polished surface;
Claim 5
Dependent Claim
60 words
inserting spacers of magnetic gap material between the grooved surfaces of said parallelepipeds and the surfaces of said magnetic plate, the spacers for adjacent parallelepipeds having different thicknesses, and joining said plurality of magnetic material parallelepipeds at the grooved surfaces to said two opposite surfaces of said magnetic plate by means of said spacers, said spacers acting as magnetic gaps;
Claim 6
Dependent Claim
60 words
inserting spacers of magnetic gap material between the grooved surfaces of said parallelepipeds and the surfaces of said magnetic plate, the spacers for adjacent parallelepipeds having different thicknesses, and joining said plurality of magnetic material parallelepipeds at the grooved surfaces to said two opposite surfaces of said magnetic plate by means of said spacers, said spacers acting as magnetic gaps;
Claim 7
Dependent Claim
84 words
cutting slots having a parallelepipedal form 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, said slots each having a width corresponding to a space between adjacent tracks on a tape and a depth extending from one edge surface of said magnetic plate and the corresponding surfaces of said magnetic material parallelepipeds to the remote side wall plane of said grooves in said magnetic material parallelepipeds;
Claim 8
Dependent Claim
84 words
cutting slots having a parallelepipedal form 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, said slots each having a width corresponding to a space between adjacent tracks on a tape and a depth extending from one edge surface of said magnetic plate and the corresponding surfaces of said magnetic material parallelepipeds to the remote side wall plane of said grooves in said magnetic material parallelepipeds;
Claim 9
Dependent Claim
14 words
inserting into said slots non-magnetic plates having essentially the same size as said slots;
Claim 10
Dependent Claim
14 words
inserting into said slots non-magnetic plates having essentially the same size as said slots;
Claim 11
Dependent Claim
41 words
cutting the resultant composite body at said remote side wall plane parallel to said edge surfaces of said magnetic plate to form a stack of a plurality of head tips separated magnetically from each other by said inserted non-magnetic plates; and
Claim 12
Dependent Claim
41 words
cutting the resultant composite body at said remote side wall plane parallel to said edge surfaces of said magnetic plate to form a stack of a plurality of head tips separated magnetically from each other by said inserted non-magnetic plates; and
Claim 13
Dependent Claim
15 words
joining a plurality of magnetic back cores having windings thereon to the respective head tips.
Claim 14
Dependent Claim
15 words
joining a plurality of magnetic back cores having windings thereon to the respective head tips.
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) | 1975-06-27 | 1975-12-27 | 1976-06-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-27 | 1979-12-27 | 1980-06-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-27 | 1983-12-27 | 1984-06-27 | $7700.00 | Window Closed / Lapsed |