US3701858A — Multichannel magnetic head unit of laminated cons…

Claim 1

Independent Claim 276 words

A multichannel magnetic head unit wherein the heads are stacked one beside the other to correspond to the parallel or concentric tracks of a movable magnetizable medium, each head comprising first and second half-heads between which is provided an air gap, each half-head being formed of a stack of sheets of various materials bonded together and arranged parallel to the direction of the tracks, wherein in each of said heads said sheets of the half-heads comprise a plurality of planes having substantially identical outlines, a plurality of said planes comprising two portions of the same thickness but of different materials, each of said first half-heads comprising, starting from a central axis of symmetry, a first plane having a magnetic circuit portion of magnetic metal and a shield portion of conductive metal, a second plAne disposed on each side of said first plane and having a magnetic circuit portion of magnetic metal and a portion of insulating material, a third plane disposed on the outside of each second plane and having two portions of conductive metal, one portion of each of said third planes serving as a soldering plate for a lead of said coil, and a fourth plane disposed on the outside of each of said third planes and consisting of a shield portion of conductive metal, a first type of said planes comprising a ferromagnetic portion and a conductive shield portion and a second type of said planes comprising a ferromagnetic portion and an insulating portion, and wherein in at least said first half-heads of each head said ferromagnetic portion of three of said planes comprises a branch defining means for receiving a transducer coil.

Claim 2

Dependent Claim 276 words

A multichannel magnetic head unit wherein the heads are stacked one beside the other to correspond to the parallel or concentric tracks of a movable magnetizable medium, each head comprising first and second half-heads between which is provided an air gap, each half-head being formed of a stack of sheets of various materials bonded together and arranged parallel to the direction of the tracks, wherein in each of said heads said sheets of the half-heads comprise a plurality of planes having substantially identical outlines, a plurality of said planes comprising two portions of the same thickness but of different materials, each of said first half-heads comprising, starting from a central axis of symmetry, a first plane having a magnetic circuit portion of magnetic metal and a shield portion of conductive metal, a second plAne disposed on each side of said first plane and having a magnetic circuit portion of magnetic metal and a portion of insulating material, a third plane disposed on the outside of each second plane and having two portions of conductive metal, one portion of each of said third planes serving as a soldering plate for a lead of said coil, and a fourth plane disposed on the outside of each of said third planes and consisting of a shield portion of conductive metal, a first type of said planes comprising a ferromagnetic portion and a conductive shield portion and a second type of said planes comprising a ferromagnetic portion and an insulating portion, and wherein in at least said first half-heads of each head said ferromagnetic portion of three of said planes comprises a branch defining means for receiving a transducer coil.

Claim 3

Dependent Claim 27 words

The unit of claim 1, further comprising a separation shield plane between adjacent magnetic heads, said shield plane comprising a conductive metal portion and an insulating portion.

Claim 4

Dependent Claim 89 words

The unit of claim 2, wherein said first and second half-heads are held in place in a flying shoe on each side of a planar air gap, and wherein two of said first half-heads, each comprising a transducer coil, are disposed in alignment on both sides of said air gap for forming a channel, wherein said second half-heads comprise magnetic elements without coils, and wherein two of said second half-heads are disposed in alignment on both sides of said air gap thereby providing an intermediary electric and magnetic shield.

Claim 5

Dependent Claim 34 words

The unit of claim 2 wherein, in each magnetic head, said second half-head comprises a magnetic element without a coil, disposed to close a magnetic circuit including the magnetic structure of said first half-head.

Claim 6

Dependent Claim 52 words

The unit of claim 4, wherein said first and second half-heads are held in place in a flying shoe on each side of a planar air gap, and wherein only said first half-heads comprise a transducer coil and are disposed alternately on each side of said air gap, each forming a channel.

Claim 7

Dependent Claim 262 words

A multichannel magnetic head unit wherein a plurality of head elements are stacked one beside the other to correspond to parallel or concentric tracks of a movable magnetizable medium, each head unit element comprising first and second half-head elements between which is provided an air gap, each half head element including half-shield members and a half-head proper which comprises a plurality of bonded together planes having substantially rectangular identical outlines, at least certain of said half-head planes comprising two portions of the same thickness but of different materials, each of said first half-head elements comprising, staring from a central axis of symmetry and on each side thereof, a first plane having a magnetic circuit portion of magnetic metal and a shield portion of conductive metal, a second plane having a magnetic circuit portion of magnetic metal and a portion of insulating material, a third plane having two portions of conductive metal, one portion of each of said third planes serving as a soldering plate for a lead of said coil, and a fourth plane consisting of a shield portion of conductive metal, a first type of said planes comprising a ferromagnetic portion and a conductive shield portion and a second type of said planes comprising a ferromagnetic portion and an insulating portion, said half-shield members comprising each at least a metal plane whose outline is identical with that of said half-head planes, and wherein in at least one of said half-head elements said ferromagnetic portion in at least three of said planes comprise a branch defining means for receiving a transducer coil.

Claim 8

Dependent Claim 262 words

A multichannel magnetic head unit wherein a plurality of head elements are stacked one beside the other to correspond to parallel or concentric tracks of a movable magnetizable medium, each head unit element comprising first and second half-head elements between which is provided an air gap, each half head element including half-shield members and a half-head proper which comprises a plurality of bonded together planes having substantially rectangular identical outlines, at least certain of said half-head planes comprising two portions of the same thickness but of different materials, each of said first half-head elements comprising, staring from a central axis of symmetry and on each side thereof, a first plane having a magnetic circuit portion of magnetic metal and a shield portion of conductive metal, a second plane having a magnetic circuit portion of magnetic metal and a portion of insulating material, a third plane having two portions of conductive metal, one portion of each of said third planes serving as a soldering plate for a lead of said coil, and a fourth plane consisting of a shield portion of conductive metal, a first type of said planes comprising a ferromagnetic portion and a conductive shield portion and a second type of said planes comprising a ferromagnetic portion and an insulating portion, said half-shield members comprising each at least a metal plane whose outline is identical with that of said half-head planes, and wherein in at least one of said half-head elements said ferromagnetic portion in at least three of said planes comprise a branch defining means for receiving a transducer coil.

Claim 9

Dependent Claim 30 words

The unit of claim 6, further comprising a separation shield plane between each pair of adjacent half-head elements, said shield plane comprising a conductive metal portion and an insulating portion.

Claim 10

Dependent Claim 41 words

The unit of claim 7, wherein in each head element, said second half-head element comprises a magnetic planar element without a coil, disposed tO close a magnetic circuit including the magnetic structure of the corresponding one of said first half-head elements.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1975-10-31	1976-05-01	1976-10-31	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1979-10-31	1980-05-01	1980-10-31	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	1983-10-31	1984-05-01	1984-10-31	$7700.00	Window Closed / Lapsed

Multichannel magnetic head unit of laminated construction

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