| 摘要 |
PURPOSE:To obtain a magnetic head, having improved environmental resistance and hardly deteriorating magnetic characteristic, by melting and permeating a glass composition, consisting essentially of Bi2O3, SiO2 and B2O3 of specific composition for joining magnetic heads into a magnetic head gap part. CONSTITUTION:A glass rod 3 is obtained from a glass composition containing a principal component, consisting of (A) 3-30mol% Bi2O3, (B) 1-30mol% PbO, (C) 30-50mol% SiO2 and (D) 1-20mol% B2O3 and satisfying the relationship of >20mol% total of the components (A) and (B), >45mol% total of the components (C) and (D) and >2 molar ratio (C/D) and (E) one or more of 1-20mol% Li2O, 1-18mol% Na2O, 1-10mol% K2O or 1-7mol% ZnO and used for joining magnetic heads. The above-mentioned glass rod 3 is then placed in each gap groove 4 of a cut part 2 machined to form a given magnetic pas sage in a ferrite block 1 and melted while heating at a temperature to give 10<2.5>-10<3>P glass viscosity thereof and then melted, permeated and adhered to the gap groove 4. The resultant magnetic head member 10 is then cut at each part of a chain line 5 to give a magnetic head front core part 6, which is then bonded to a back core 7, ground and finished to a position of a chain line 8.
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