Patent ID: 6631050
Filing Date: 2003-10-07
Classification: C03C,G11B

Abstract:
A magnetic head comprising a pair of magnetic core halves, in which a coil groove is provided at least on one side, and a metallic ferromagnetic film is formed on at least one gap facing surface, joined by butting said gap facing surfaces together via a magnetic gap material, in which the front gap side is joined with a front sealing glass, and the back gap side is joined with a back sealing glass,said front sealing glass comprising: 16 to 17 wt % SiO2; 5 to 6.8 Wt % B2O3; 75.5 to 77 wt % PbO; 0.1 to 5 wt % of Al2O3, ZnO, or a mixture thereof, in which the total content of Al2O3 and ZnO is not higher than 5 wt %; and 0.1 to 3 wt % of Na2O, K2O, or a mixture thereof, in which the total content of Na2O and K2O is not higher than 3 wt %, on an oxide basis; and said back sealing glass comprising: 3 to 9 wt % SiO2; 11 to 17 wt % B2O3; 66 to 77 wt % PbO; and 3 to 15 wt % of Al2O3, ZnO, or a mixture thereof, on an oxide basis.