Laminated magnetic core

专利名称：Laminated magnetic core发明人：Norio Yuki申请号：US07/388519申请日：19890802公开号：US05097373A公开日：19920317

摘要：There is disclosed a laminated magnetic core characterized in that core-formingthin sheets each having a surface roughness such that the maximum height Rmax is atleast 1 &mgr;m are laminated together with a sheet-to-sheet distance of 2 to 10&mgr;m, desirably 3 to 6 &mgr;m and that at least a part of protruded portions of theopposite roughed surfaces is diffusion-bonded to each other at the interface betweenadjacent thin sheets. The laminated magnetic core may have innumerable voids presentat the diffusion-bonded interface between the adjacent thin sheets. This invention furtherprovides a method of manufacturing a laminated magnetic core comprising the steps ofproviding a plurality of core-forming thin sheets each having a surface roughness suchthat the maximum height Rmax is at least 1 &mgr;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 &mgr;m; punching out a block of a given shape from saidlaminated and bonded core-forming sheets by a press; and thereafter magneticallyannealing the block while decomposing and vaporizing said organic adhesive to effectdiffusion- bonding at the interface between adjacent thin sheets of the block leavinginnumerable voids at the interface.

申请人：NIPPON MINING CO., LTD.

代理机构：Wood, Phillips, Mason, Recktenwald & Vansanten

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