Method of making magnetic head device

Claim 1

A method of making a multiple magnetic head unit comprising the steps of: providing a single thin piece of a very highpermeability magnetic material having a common base portion with a plurality of spaced strips extending in a parallel fashion from said common base at right angles to form a plurality of spaced strips; shaping each strip in the general form of a hairpin having two legs with at least one of said legs being sharply bent near an end thereof; providing a coil inductively coupled to each hairpin; securing together the end portions of the legs of each hairpin with a nonmagnetic gap material which provides a precise gap space therebetween; and cutting the end portions of said legs to provide a gap interface of predetermined length for each hairpin, said cutting being done so as to sever all portions of the of the magnetic material of the common base which interconnect the plurality of spaced strips.

Claim 2

A method of making a multiple magnetic head unit comprising the steps of: providing a single thin piece of a very highpermeability magnetic material having a common base portion with a plurality of spaced strips extending in a parallel fashion from said common base at right angles to form a plurality of spaced strips; shaping each strip in the general form of a hairpin having two legs with at least one of said legs being sharply bent near an end thereof; providing a coil inductively coupled to each hairpin; securing together the end portions of the legs of each hairpin with a nonmagnetic gap material which provides a precise gap space therebetween; and cutting the end portions of said legs to provide a gap interface of predetermined length for each hairpin, said cutting being done so as to sever all portions of the of the magnetic material of the common base which interconnect the plurality of spaced strips.

Claim 3

A method of making a multiple magnetic head unit comprising the steps of: providing a single thin integral piece of a very high-permeability magnetic sheet having a common base portion and a plurality of spaced strips extending therefrom, shaping each strip in the general form of a hairpin having two legs with one of said legs being sharply bent near an end thereof for forming a gap interface at the ends of said legs and further bent to form a coil-receiving opening between said legs, annealing each hairpin to optimize its magnetic properties, winding a coil for each hairpin apart therefrom and then inserting the coil on a leg of each hairpin, securing together the end portions of the legs of each hairpin with a very thin nonmagnetic gap therebetween to form a gap interface, enclosing the resulting hairpin heads in a nonmagnetic housing, and cutting the housing and legs to provide a predetermined length for each gap interface, said cutting being done so as to sever the entire common base portion of the magnetic sheet which interconnects the plurality of spaced strips.

Claim 4

A method of making a multiple magnetic head unit comprising the steps of: providing a single thin integral piece of a very high-permeability magnetic sheet having a common base portion and a plurality of spaced strips extending therefrom, shaping each strip in the general form of a hairpin having two legs with one of said legs being sharply bent near an end thereof for forming a gap interface at the ends of said legs and further bent to form a coil-receiving opening between said legs, annealing each hairpin to optimize its magnetic properties, winding a coil for each hairpin apart therefrom and then inserting the coil on a leg of each hairpin, securing together the end portions of the legs of each hairpin with a very thin nonmagnetic gap therebetween to form a gap interface, enclosing the resulting hairpin heads in a nonmagnetic housing, and cutting the housing and legs to provide a predetermined length for each gap interface, said cutting being done so as to sever the entire common base portion of the magnetic sheet which interconnects the plurality of spaced strips.

Claim 5

A method of making a multiple magnetic head unit containing read and write sections comprising the steps of: providing first and second sheets of a very high-permeability magnetic material, each sheet having a common base portion from which extend in parallel a plurality of spaced strips, shaping each strip of each sheet in the general form of a hairpin having two legs forming poles with one of said legs being sharply bent near an end thereof for forming a gap interface at the ends of said legs and further bent to form a coil-receiving opening between said legs, annealing each hairpin to optimize its magnetic properties, winding a coil for each hairpin apart therefrom and then inserting the coil on a leg of each hairpin, securing together the end portions of the legs of each hairpin with a very thin nonmagnetic gap material therebetween to form a precisionally spaced gap interface, and securing the thus-formed first and second sheets in a housing in a precisely predetermined alignment relationship wherein each pole of the read section is aligned with a corresponding pole of the write section; aNd cutting a portion of each of said legs so as to sever the common base portion of each of said first and second sheets.

Claim 6

A method of making a multiple magnetic head unit containing read and write sections comprising the steps of: providing first and second sheets of a very high-permeability magnetic material, each sheet having a common base portion from which extend in parallel a plurality of spaced strips, shaping each strip of each sheet in the general form of a hairpin having two legs forming poles with one of said legs being sharply bent near an end thereof for forming a gap interface at the ends of said legs and further bent to form a coil-receiving opening between said legs, annealing each hairpin to optimize its magnetic properties, winding a coil for each hairpin apart therefrom and then inserting the coil on a leg of each hairpin, securing together the end portions of the legs of each hairpin with a very thin nonmagnetic gap material therebetween to form a precisionally spaced gap interface, and securing the thus-formed first and second sheets in a housing in a precisely predetermined alignment relationship wherein each pole of the read section is aligned with a corresponding pole of the write section; aNd cutting a portion of each of said legs so as to sever the common base portion of each of said first and second sheets.