MAGNETIC HEAD HAVING MAGNETICALLY NARROW GAP WITH WIDE GAP STRUCTURAL SUPPORT

摘要

A narrow track magnetic record/playback head of adequate mechanical strength is made by profiling one of a pair of ferrite blocks forming the head-core and building up the portions removed by the profiling, as well as joining the blocks together by glass or vitreous enamel. The block 1, Fig. 1, is multiply grooved with recesses 2 of rectangular section which are filled with a glass of m.p. 700 DEG C. and the block divided at 3 to provide blocks which are further profiled on the faces 1a to make 10 heads. PICT:1000710/C1/1 PICT:1000710/C1/2 PICT:1000710/C1/3 PICT:1000710/C1/4 PICT:1000710/C1/5 PICT:1000710/C1/6 blocks are then V-grooved at 4 Figs. 3, 4, to intersect the recesses 2 and to leave a depth d somewhat greater than the final gap-height after the grooves 4 are filled with a 600 DEG m.p. enamel, the faces 1a are then ground away until the portions later forming the flats 7, Fig. 9 are of the required track-width. Recesses 5, Fig. 6, removing half of the enamel filling 6 are ground out to provide winding clearance and the blocks cemented or soldered to plain blocks of ferrite 9, Fig. 7, by enamel or solder of lower melting-point than the glass 2 or the enamel 6 and the individual head-blocks separated by cutting along lines 10, 11.