Method of making a magnetic transducer

Claim 1

The method of producing a magnetic transducer comprising the steps of: a. forming a recess on one side of a non-magnetic substrate; b. forming a generally planar first magnetic plate in said recess, with said plate having a pole end and a back end; c. insulatingly supporting and forming over said plate and one side a coil means in the general shape of a spiral so that the outer turn thereof lies near said pole end, and the inner turn of said coil means lies near said back end; d. and insulatingly supporting and forming a second magnetic plate over said coil means with said second plate having a pole end positioned opposite the pole end of said first plate and having a back end magnetically coupled to the back end of said first magnetic plate, and with at least the outer turn of said coil means being positioned between said pole ends.

Claim 2

The method of producing a magnetic transducer comprising the steps of: a. forming a recess on one side of a non-magnetic substrate; b. forming a generally planar first magnetic plate in said recess, with said plate having a pole end and a back end; c. insulatingly supporting and forming over said plate and one side a coil means in the general shape of a spiral so that the outer turn thereof lies near said pole end, and the inner turn of said coil means lies near said back end; d. and insulatingly supporting and forming a second magnetic plate over said coil means with said second plate having a pole end positioned opposite the pole end of said first plate and having a back end magnetically coupled to the back end of said first magnetic plate, and with at least the outer turn of said coil means being positioned between said pole ends.

Claim 4

The method of producing a magnetic transducer comprising the steps of: a. forming a first magnetic plate on a non-magnetic substrate, with said plate having a pole end and a back end; b. depositing a first thin film of insulation over the entire surface of said substrate and plate; c. depositing a layer of conDuctor metal over said insulation; d. forming a coil means in the general shape of a spiral of said conductor metal; e. depositing a second thin film of insulation over said first film of insulation and said coil means; f. removing portions of said second film of insulation near said back end of said first plate to expose said back end and to expose the ends of said coil means; and g. forming a second magnetic plate on said second film of insulation and said back end to magnetically couple said back end with said second magnetic plate, said second plate having a pole end which is spaced from said pole end of said first magnetic plate to produce a transducer gap with an outer portion of said coil means being positioned between said pole ends.

Claim 5

The method of producing a magnetic transducer comprising the steps of: a. forming a first magnetic plate on a non-magnetic substrate, with said plate having a pole end and a back end; b. depositing a first thin film of insulation over the entire surface of said substrate and plate; c. depositing a layer of conDuctor metal over said insulation; d. forming a coil means in the general shape of a spiral of said conductor metal; e. depositing a second thin film of insulation over said first film of insulation and said coil means; f. removing portions of said second film of insulation near said back end of said first plate to expose said back end and to expose the ends of said coil means; and g. forming a second magnetic plate on said second film of insulation and said back end to magnetically couple said back end with said second magnetic plate, said second plate having a pole end which is spaced from said pole end of said first magnetic plate to produce a transducer gap with an outer portion of said coil means being positioned between said pole ends.

Claim 8

The method of producing a bifilar magnetic transducer comprising the steps of: a. forming a first magnetic plate on a non-magnetic substrate with said plate having a pole end and a back end; b. depositing a first thin film of insulation over the entire surface of said substrate and plate; c. depositing a layer of conductor metal over said insulation; d. delineating portions of said conductor metal to be removed so that, upon the removal thereof, a desired first coil in the general shape of a spiral will be produced by the metal remaining; e. etching away said portions of step (d) down to said first film of insulation to produce said first coil with spaces between adjacent turns thereof; f. depositing a second thin film of insulation over said first coil and said first film of insulation from step (e); g. depositing a second layer of conductor metal over said second film of insulation; h. delineating portions of said second layer of conductor metal to be removed so that upon the removal thereof, a desired second coil in the general shape of a spiral will be produced by the metal remaining; i. removing said portions of said second layer of metal down to said second film of insulation while leaving said metal of step (g) in said spaces between the turns of said first coil to thereby form discrete turns of said second coil of said transducer; j. depositing a third thin film of insulation over said second coil; k. depositing a layer of permalloy metal on said third film of insulation; L. delineating portions of said permalloy metal of step (k) to be removed so that, upon the removal thereof, a desired second magnetic plate having a pole end and a back end will be produced by the permalloy metal remaining; and m. joining said back ends of said first and second plates and exposing the ends of said coils for making connections thereto.

Claim 9

The method of producing a bifilar magnetic transducer comprising the steps of: a. forming a first magnetic plate on a non-magnetic substrate with said plate having a pole end and a back end; b. depositing a first thin film of insulation over the entire surface of said substrate and plate; c. depositing a layer of conductor metal over said insulation; d. delineating portions of said conductor metal to be removed so that, upon the removal thereof, a desired first coil in the general shape of a spiral will be produced by the metal remaining; e. etching away said portions of step (d) down to said first film of insulation to produce said first coil with spaces between adjacent turns thereof; f. depositing a second thin film of insulation over said first coil and said first film of insulation from step (e); g. depositing a second layer of conductor metal over said second film of insulation; h. delineating portions of said second layer of conductor metal to be removed so that upon the removal thereof, a desired second coil in the general shape of a spiral will be produced by the metal remaining; i. removing said portions of said second layer of metal down to said second film of insulation while leaving said metal of step (g) in said spaces between the turns of said first coil to thereby form discrete turns of said second coil of said transducer; j. depositing a third thin film of insulation over said second coil; k. depositing a layer of permalloy metal on said third film of insulation; L. delineating portions of said permalloy metal of step (k) to be removed so that, upon the removal thereof, a desired second magnetic plate having a pole end and a back end will be produced by the permalloy metal remaining; and m. joining said back ends of said first and second plates and exposing the ends of said coils for making connections thereto.

Claim 11

The method of producing a bifilar magnetic transducer comprising the steps of: a. forming a recess on one side of a non-magnetic substrate; b. forming a generally planar first magnetic plate in said recess, with said plate having a pole end and a back end; c. insulatingly supporting and forming oVer said plate and one side a plurality of spirally shaped, planar coil windings for first and second multi-turn coils, the windings of said first and second coils being alternated in generally superposed relationship, with at least the outermost turn of the windings of said first and second coils being positioned near said pole end; d. forming a second magnetic circuit plate over said plurality of windings, with said second plate having a pole end positioned opposite the pole end of said first plate and having a back end magnetically coupled to the back end of said first plate, and with at least one of the outermost turns of the windings of said first and second coils being positioned between said pole ends; and e. connecting the ends of the windings of said first coil to form one continuous multilayered winding, and similarly connecting the ends of the windings of said second coil to form one continuous multilayered winding.

Claim 12

The method of producing a bifilar magnetic transducer comprising the steps of: a. forming a recess on one side of a non-magnetic substrate; b. forming a generally planar first magnetic plate in said recess, with said plate having a pole end and a back end; c. insulatingly supporting and forming oVer said plate and one side a plurality of spirally shaped, planar coil windings for first and second multi-turn coils, the windings of said first and second coils being alternated in generally superposed relationship, with at least the outermost turn of the windings of said first and second coils being positioned near said pole end; d. forming a second magnetic circuit plate over said plurality of windings, with said second plate having a pole end positioned opposite the pole end of said first plate and having a back end magnetically coupled to the back end of said first plate, and with at least one of the outermost turns of the windings of said first and second coils being positioned between said pole ends; and e. connecting the ends of the windings of said first coil to form one continuous multilayered winding, and similarly connecting the ends of the windings of said second coil to form one continuous multilayered winding.

Claim 13

The method of producing a magnetic transducer comprising the steps of: a. etching a recess in a surface of a non-magnetic substrate; b. depositing a permalloy to overfill said recess; c. abrading the excess permalloy so that the top thereof lies in the plane of said surface to form a first magnetic plate; d. depositing a thin film of insulation over the entire said surface of said substrate; e. depositing a thin layer of metal over the entire surface of said insulation to form a plating electrode; f. electro-plating a conductor metal over said thin layer of metal to a desired thickness; g. delineating the portions of said conductor metal to be removed so that, upon the removal thereof, a desired coil configuration will be produced by the conductor metal remaining; h. etching said portions down to said film of insulation to produce said coil configuration; i. depositing a second thin film of insulation over said surface of said substrate and said coil configuration; j. delineating an area near one end of said first plate to be removed; k. etching said area of step (j) to expose said first magnetic plate thereat; L. depositing a second thin layer of metal over the surface of said second film of insulation and the portion of the first magnetic plate as exposed from step (k); m. depositing a layer of permalloy metal on said second thin layer of metal; and n. delineating portions of said permalloy metal of step (m) to be removed so that, upon the removal thereof, a desired second magnetic plate will be produced by the permalloy metal remaining.

Claim 14

The method of producing a magnetic transducer comprising the steps of: a. etching a recess in a surface of a non-magnetic substrate; b. depositing a permalloy to overfill said recess; c. abrading the excess permalloy so that the top thereof lies in the plane of said surface to form a first magnetic plate; d. depositing a thin film of insulation over the entire said surface of said substrate; e. depositing a thin layer of metal over the entire surface of said insulation to form a plating electrode; f. electro-plating a conductor metal over said thin layer of metal to a desired thickness; g. delineating the portions of said conductor metal to be removed so that, upon the removal thereof, a desired coil configuration will be produced by the conductor metal remaining; h. etching said portions down to said film of insulation to produce said coil configuration; i. depositing a second thin film of insulation over said surface of said substrate and said coil configuration; j. delineating an area near one end of said first plate to be removed; k. etching said area of step (j) to expose said first magnetic plate thereat; L. depositing a second thin layer of metal over the surface of said second film of insulation and the portion of the first magnetic plate as exposed from step (k); m. depositing a layer of permalloy metal on said second thin layer of metal; and n. delineating portions of said permalloy metal of step (m) to be removed so that, upon the removal thereof, a desired second magnetic plate will be produced by the permalloy metal remaining.