PURPOSE: To obtain a highly reliable magnetic head for VTR by using thin band- like "Sendust" cores and adopting glass to an adhering process.
CONSTITUTION: The thin band-like cores 10 having about 20μm thickness and nonmagnetic plates 11 such as glass are alternately laminated and adhered with powder glass, sodium silicate or the like to obtain a core semi-block 12. A groove 13 for a winding window and a groove 14 for a winding frame are worked on one of these semi-blocks 12, the winding frame groove 14 is formed on the other semi-block 12 and a nonmagnetic member such as SiO2 and AlO3 is adhered to a gap forming surface with the thickness of a half of gap length. The core semi-blocks 15, 16 are butted so that there "Sendust" cores 10 are opposed, a glass rod 18 is inserted into the winding window groove 13 and the whole parts are welded with glass under pressure and heat to form a core block 19 having a prescribed gap length. The sliding surface of the block 19 is ground to finish a prescribed gap depth and forward magnetic plates 11 are cut off and finished with a prescribed thickness. Thus, the highly reliable head chip is obtained.
MIYAGUCHI SATOSHI
TOMITA YOSHIMI
Next Patent: JPS6066307