Glass manufacturing – Processes – Fusion bonding of glass to a formed part
65 36, 65 58, 29603, C03B 2320
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 SiO.sub.2, 8-30 mol % of B.sub.2 O.sub.3 and containing 2-15 mol % of alkali metal oxide Na.sub.2 O and K.sub.2 O and 0.1-5 mol % of Al.sub.2 O.sub.3, with the molar ratio of boron oxide to alkali metal oxides being defined by the following formula: ##EQU1## The magnetic head provides sharpness of the recording leakage flux, thus giving excellent electromagnetic conversion characteristics.
patent: 3479738 (1969-11-01), Hanak
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patent: 4170032 (1979-10-01), Yokoyama et al.
Kellogg Arthur D.
Matsushita Electric - Industrial Co., Ltd.
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