Amorphous magnetic head

Claim 1

A magnetic head, comprising: two core pieces, each comprising a laminated block having a ferromagnetic core layer sandwiched between a first non-magnetic substrate layer and second non-magnetic substrate layer: said two core pieces having respective confronting edge surfaces at which corresponding ones of said layers confront one another, block to block; a corresponding portion of each of said confronting edge surfaces constituting a respective gap-forming surface, a magnetic gap being defined between said gap-forming surfaces; means defining a recess for a coil winding in at least one of said core pieces, each said recess defining means being contiguous with said gap-forming surface of the respective said core piece; a gap spacer means provided in said gap on at least one of said gap-forming surfaces; at least one groove formed in said first non-magnetic substrate layer in the confronting edge surface of a respective said block, at least part of such groove being formed in the corresponding gap-forming surface; at least another groove formed in said second non-magnetic substrate layer in the confronting edge surface of a respective said block, at least part of such groove being formed in the corresponding gap-forming surface; each said grooves being defined by a respective inner wall surface; a metal layer formed on said wall surface of each said grooves; said core pieces being bonded together by a filling of adherent glass in said grooves, said glass in each said grooves adhering both to a respective said metal layer in such groove in a respective one of said blocks and to bonding means provided on the corresponding non-magnetic substrate layer on the corresponding other of said blocks; each said ferromagnetic core layers comprising at least one layer of amorphous ferromagnetic material; and said adherent glass filling said grooves being a lead-containing glass having a melting point which is lower than the temperature of crystallization of said amorphous ferromagnetic material; said gap spacer means comprising: two first layers of high melting-point glass, one adhering to each said gap-forming surfaces; and a second layer of lower melting-point glass sandwiched between said two first layers of high melting-point glass and adhering to both of said two first layers of high melting-point glass.