Dynamic magnetic information storage or retrieval – Head – Core
Patent
1989-08-02
1992-03-17
Heinz, A. J.
Dynamic magnetic information storage or retrieval
Head
Core
G11B 5147
Patent
active
050973738
ABSTRACT:
There is disclosed a laminated magnetic core characterized in that core-forming thin sheets each having a surface roughness such that the maximum height Rmax is at least 1 .mu.m are laminated together with a sheet-to-sheet distance of 2 to 10 .mu.m, desirably 3 to 6 .mu.m and that at least a part of protruded portions of the opposite roughed surfaces is diffusion-bonded to each other at the interface between adjacent thin sheets. The laminated magnetic core may have innumerable voids present at the diffusion-bonded interface between the adjacent thin sheets. This invention further provides a method of manufacturing a laminated magnetic core comprising the steps of providing a plurality of core-forming thin sheets each having a surface roughness such that the maximum height Rmax is at least 1 .mu.m; laminating and bonding said core-forming thin sheets one upon another through an organic adhesive, desirably at a sheet-to-sheet distance of 2 to 10 .mu.m; punching out a block of a given shape from said laminated and bonded core-forming sheets by a press; and thereafter magnetically annealing the block while decomposing and vaporizing said organic adhesive to effect diffusion-bonding at the interface between adjacent thin sheets of the block leaving innumerable voids at the interface.
REFERENCES:
patent: 3614830 (1971-10-01), Bate
patent: 4288260 (1981-09-01), Senno
patent: 4488195 (1984-12-01), Yanagiuchi
patent: 4543208 (1985-09-01), Horie
Heinz A. J.
Nippon Mining Co., Ltd.
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