Bias means for batch fabricated magnetic head and method of manufacture thereof

Claim 2

A thin film, batch fabricated inductive magnetic recording head, comprising: a first generally planar magnetic layer; a set of separate first elongated conductive layers each deposited in a row on said first magnetic layer and each forming an inductive path; a second elongated conductive layer deposited on said first magnetic layer adjacent, and in the same plane as, said set of separate first conductive layers; a set of separate second generally planar magnetic layers, one for each separate first conductive layer, deposited substantially over all said first and second conductive layers; and a third magnetic layer intermediate said first and second magnetic layer and passing through each of said first conductive layers to complete a magnetic path from said first to said second magnetic layers.

Claim 3

The head of claim 1 wherein each of the first conductive layers comprises a single-turn bend.

Claim 4

The head of claim 1 wherein each of the first conductive layers comprises a multi-turn spiral.

Claim 5

A multi-track, multi-gap magnetic recording head including in combination: a substantially flat magnetic substrate; a plurality of elongated thin film recording conductors, one for each track, deposited on said substrate in a row along a first line; a single elongated thin film bias conductor deposited on said substrate adjacent said recording conductors along a second line adjacent said first line; and a magnetic closure overlying said recording and bias conductors and magnetically connected to the substrate around said recording conductors to form a magnetic path including the substrate and the closure, and forming a series of gaps, defined by said bias conductors, along a third line adjacent the first line and not the second line.

Claim 6

A multi-track, multi-gap magnetic recording head including in combination: a substantially flat magnetic substrate; a plurality of elongated thin film recording conductors, one for each track, deposited on said substrate in a row along a first line; a single elongated thin film bias conductor deposited on said substrate adjacent said recording conductors along a second line adjacent said first line; and a magnetic closure overlying said recording and bias conductors and magnetically connected to the substrate around said recording conductors to form a magnetic path including the substrate and the closure, and forming a series of gaps, defined by said bias conductors, along a third line adjacent the first line and not the second line.

Claim 7

The combination of claim 4 wherein the conductors comprise a plurality of separate layers of conductive material.

Claim 8

Apparatus for orienting magnetic particles on a media in accordance with electric recording signals, including in combination: a first magnetic material, forming a continuous layer; a plurality of adjacent thin film electric recording conductor loops, each with an aperture, deposited on said first magnetic material in a row; a thin film electric bias conductor deposited on said first magnetic material and encompassing all said recording conductors; a second magnetic material placed over said recording and bias conductors and including a back-gap portion completing a magnetic path to said first layer through each said apertures; a source of electric recording current separately connected to each recording conductor loop for supplying electric recording signals therethrough; and a source of electric bias current connected to the bias conductor for supplying bias signals therethrough.

Claim 9

Apparatus for orienting magnetic particles on a media in accordance with electric recording signals, including in combination: a first magnetic material, forming a continuous layer; a plurality of adjacent thin film electric recording conductor loops, each with an aperture, deposited on said first magnetic material in a row; a thin film electric bias conductor deposited on said first magnetic material and encompassing all said recording conductors; a second magnetic material placed over said recording and bias conductors and including a back-gap portion completing a magnetic path to said first layer through each said apertures; a source of electric recording current separately connected to each recording conductor loop for supplying electric recording signals therethrough; and a source of electric bias current connected to the bias conductor for supplying bias signals therethrough.

Claim 10

The combination of claim 6 wherein the bias conductor comprises a plurality of metallic layers.

Claim 11

The combination of claim 7 wherein each recording conductor loop defines a single-turn bend.

Claim 12

The combination of claim 7 wherein each recording conductor loop defines a multi-turN spiral.

Claim 13

A magnetic recording transducer, including: a magnetic material forming a planar substrate for receiving other materials thereon and comprising one portion of a magnetic path; electrically conductive thin film materials deposited on said substrate in predetermined areas defining a plurality of elongated recording windings each having a central aperture and arranged in a row, and an elongated single bias winding around the periphery of said recording windings; and additional magnetic material deposited on said substrate in aforesaid areas and over said conductive material, to complete a magnetic path around each recording winding and form a non-magnetic gap defined by the bias winding.

Claim 14

A magnetic recording transducer, including: a magnetic material forming a planar substrate for receiving other materials thereon and comprising one portion of a magnetic path; electrically conductive thin film materials deposited on said substrate in predetermined areas defining a plurality of elongated recording windings each having a central aperture and arranged in a row, and an elongated single bias winding around the periphery of said recording windings; and additional magnetic material deposited on said substrate in aforesaid areas and over said conductive material, to complete a magnetic path around each recording winding and form a non-magnetic gap defined by the bias winding.

Claim 15

The transducer of claim 10 wherein there is additionally deposited on said substrate adjacent the bias winding a non-conductive, non-magnetic wear material.

Claim 16

The transducer of claim 10 wherein the wear material is a ceramic belonging to the class of materials including Al2O3, and the conductive materials belonging to the class including copper and titanium.

Claim 17

The transducer of claim 11 wherein the conductive materials include a plurality of separately deposited metals.

Claim 18

The transducer of claim 13 wherein the recording winding is shaped as a single-turn bend.

Claim 19

The transducer of claim 13 wherein the recording winding is shaped as a multi-turn spiral.

Claim 22

The method of claim 16 wherein a metallic material is deposited over the entire surface prior to depositing the conductive material, and subsequent material removal acts on both the metallic and conductive materials.

Claim 23

The method of claim 17, wherein: a wear resisting material is deposited on the surface; and the wear resistant material is removed except from a selected area in the gap prior to further depositing magnetic material.

Claim 24

The method of claim 18 including the further step of attaching conductive leads to the record and bias loops prior to further depositing magnetic material.