Abstract A method for fabricating an array of read-write heads for a magnetic storage means, such as a disk or drum, is disclosed. Each head is comprised of a flux carrying means, such as a gapped magnetic loop inductively coupled to a flux producing means, such as a pair of coils. The coils, together with a portion of the associated addressing circuitry, are formed on a high resistivity substrate. The halves of the magnetic loops that lie on opposite sides of the coil assembly are fabricated in the relative position on two separate assemblies. The two assemblies are then bonded to opposite sides of the coil assembly so that the halves of the magnetic loops mate through holes in the substrate to form the complete gapped magnetic loops. The excess material of the assemblies is then cut away as required to leave magnetically isolated magnetic loops and the associated coils embedded within a solid body. The sensing gaps of the magnetic loops are formed by vacuum depositing a thin layer of nonmagnetic material on a face of one ferrite part, disposing a second ferrite part against the thin nonmagnetic layer and bonding the two ferrite parts together, taking a section of two ferrite parts normal to the nonmagnetic layer, and bridging the nonmagnetic layer with a third ferrite part to complete the magnetic loop. The loop assemblies may be formed by cutting grooves in the faces of ferrite blocks to form a number of ferrite mesas corresponding to the number of read-write heads. The grooves are then filled with a nonmagnetic material to magnetically isolate the ferrite mesas. The loop assemblies are then bonded to opposite sides of the coil assembly before being separated from the ferrite block. Alternatively, the ferrite assembly may be formed by laminating a layer of ferrite material, or two layers of ferrite material separated by a thin layer of nonmagnetic material for forming a sensing gap, between two layers of nonmagnetic material, slicing the layers in a plane normal to the layers to produce a number of slices each having a strip of ferrite disposed between strips of nonmagnetic material, then laminating these slices such that each strip of ferrite is isolated by nonmagnetic material. This laminated structure is again sliced normal to the last laminating joints to produce slices having individually isolated ferrite islands extending normal to the slice. Each ferrite island is then incorporated into a magnetic loop.
In a method for fabricating an array of magnetic read-write heads, the steps of: a. cutting a plurality of generally parallel grooves in the face of a block of ferrite to define a plurality of mesas; b. filling the grooves with non-magnetic material; c. incorporating a plurality of the mesas of ferrite material into a corresponding number of magnetic loops; d. machining the block of ferrite and the non-magnetic material filling the grooves to leave a pair of ferrite posts projecting outwardly from at least one of the mesas; and e. separating the mesas of ferrite material from the block of ferrite material, such that each mesa is isolated from the other mesas by the non-magnetic material.
Claim 2
Dependent Claim
117 words
In a method for fabricating an array of magnetic read-write heads, the steps of: a. cutting a plurality of generally parallel grooves in the face of a block of ferrite to define a plurality of mesas; b. filling the grooves with non-magnetic material; c. incorporating a plurality of the mesas of ferrite material into a corresponding number of magnetic loops; d. machining the block of ferrite and the non-magnetic material filling the grooves to leave a pair of ferrite posts projecting outwardly from at least one of the mesas; and e. separating the mesas of ferrite material from the block of ferrite material, such that each mesa is isolated from the other mesas by the non-magnetic material.
Claim 3
Dependent Claim
154 words
In a method for fabricating an array of magnetic read-write heads, the steps of: a. forming a block of ferrite by bonding at least two ferrite parts together with a thin layer of non-magnetic material of uniform thickness. b. cutting a plurality of generally parallel grooves in the face of the block of ferrite to define a plurality of mesas, the parallel grooves being cut normal to the thin layer of non-magnetic material; c. filling the grooves with non-magnetic material; d. incorporating a plurality of the mesas of ferrite material into a corresponding number of magnetic loops; e. machining the block of ferrite and the non-magnetic material filling the grooves to leave a pair of ferrite posts projecting outwardly from at least one of the mesas; and f. separating the mesas of ferrite material from the block of ferrite material, such that each mesa is isolated from the other mesas by the non-magnetic material.
Claim 4
Dependent Claim
154 words
In a method for fabricating an array of magnetic read-write heads, the steps of: a. forming a block of ferrite by bonding at least two ferrite parts together with a thin layer of non-magnetic material of uniform thickness. b. cutting a plurality of generally parallel grooves in the face of the block of ferrite to define a plurality of mesas, the parallel grooves being cut normal to the thin layer of non-magnetic material; c. filling the grooves with non-magnetic material; d. incorporating a plurality of the mesas of ferrite material into a corresponding number of magnetic loops; e. machining the block of ferrite and the non-magnetic material filling the grooves to leave a pair of ferrite posts projecting outwardly from at least one of the mesas; and f. separating the mesas of ferrite material from the block of ferrite material, such that each mesa is isolated from the other mesas by the non-magnetic material.