| 摘要 |
PURPOSE:To obtain a head which obviates tape squeaking and has excellent wear resistance, etc. by fixing a magnetic core formed by laminating thin core sheets via an insulating layer consisting of pulverous inorg. particles and insulating adhesive agent having heat resistance and insulating characteristic into a case packed internally with a fixing material contg. an org. lubricating agent. CONSTITUTION:Plural, for example, three sheets of the thin core sheets 2 each stuck with a pulverous particle layer 3 consisting of Al2O3, etc. having heat resistance, an insulating characteristic even after a heat treatment, >=5Mohs hardness and about <=15mu grain size are superposed to manufacture a laminate 5 joined tentatively only at the ends 4, 4 of the sheets 2 to each other. The laminate 5 is subjected to hydrogen annealing for two hours at 1,050-1,150 deg.C. The insulating adhesive agent such as epoxy resin is then impregnated into the layer 3 to form the insulating layer 6 and to join thoroughly the layers, by which a magnetic core half body 7 is completed. For example, four pieces of the magnetic cores 8 formed by joining the bodies 7 to each other via a magnetic gap are fitted into a case 9 with shielding materials 10, 11 in-between by means of an immobilizing material consisting of a resin or the like contg. metallic soap of higher fatty acid, the ester thereof, silicone oil or the like. Eddy current loss is thus decreased and a high-frequency characteristic, etc. are improved. |
