A magnetic head having a sputter-deposited glass film of the gap forming area of the magnetic core, said glass film being made of borosilicate glass having the composition consisting of 65-85 mol % of SiO2, 8-30 mol % of B2O3 and containing 2-15 mol % of alkali metal oxide Na2O and K2O and 0.1-5 mol % of Al2O3, with the molar ratio of boron oxide to alkali metal oxides being defined by the following formula: <IMAGE> The magnetic head provides sharpness of the recording leakage flux, thus giving excellent electromagnetic conversion characteristics.
申请公布号
DE2840604(C2)
申请公布日期
1986.01.30
申请号
DE19782840604
申请日期
1978.09.18
申请人
MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD., KADOMA, OSAKA, JP
