Magnetic head and method of fabricating the same

Claim 2

A magnetic head comprising: first and second half-core members, said half-core members each including a front face, and four side faces perpendicular thereto; a non-magnetic layer; said first and second half-core members being assembled together with respective ones of said side faces adjacent one another and with said non-magnetic layer interposed therebetween to from a front working surface of the head with a planar working gap therein; at least one winding mounted on said first and second half-core members; said front faces of said first and second half-core member cooperatively defining said front working surface, said half-core members each being provided with a cavity extending in part in said front face, in one of said side surfaces adjacent to and in the side face remote from the side face forming said gap, said cavity having a bounding edge at said front face which constitutes the edge of said front working surface, said bounding edges of each of said core halves combining to form a bell-shaped curve symmetrically disposed about the plane of said working gap; a hollow cover member having at least one slot which receives said first and second half-core members, said slot extending beyond said bounding edges to expose said front surfaces of said half-core members beyond said bounding edges, a non-magnetic adhesive material filling said cavities and forming a continuous surface with said front working surface which is exposed through said slot; and terminals mounted in said hollow member and electrically coupled to said winding.

Claim 3

A magnetic head as claimed in claim 1 wherein each core half is further provided with a second cavity extending in part in said front face, in the other of said one surfaces adjacent to and in the side face remote from the side face forming said gap, said second cavity having a bounding edge at said front face which constitutes an edge of said front working surface, said bounding edges of each core half combining to form a bell-shaped curve symmetrically disposed about the plane of said working gap and, said bounding edges of said front faces of said first and second half-core members are located symmetrically with respect to a mid line of said half-core members which is perpendicular to said plane passing through said working gap of the magnetic head.

Claim 4

A magnetic head comprising: first and second half-core members, said half-core members each including a front face, and four side faces perpendicular thereto; a non-magnetic layer; said first and second half-core members being assembled together with respective ones of said side faces adjacent one another and with said non-magnetic layer interposed therebetween to form a front working surface of the head with a planar working gap therein; at least one winding mounted on said first and second half-core members; said front faces of said first and second half-core members cooperatively defining said front working surface, said half-core members each being provided with a cavity extending in part in said front face, in one of said side surfaces adjacent to and in the side face remote from the side face forming said gap, said cavity having a bounding edge at said front face which constitutes the edge of said front working surface, said bounding edges of each of said core halves forming an exponential curve about the plane of said working gap, with the curves being symmetrically disposed about the plane of the working gap; a hollow cover member having at least one slot which receives said first and second half-core members, said slot extending beyond said bounding edges to expose said front surfaces of said half-core members beyond said bounding edges, a non-magnetic adhesive material filling said cavities and forming a continuous surface with said front working surface which is exposed through said slot; and terminals mounted in said hollow member and electrically coupled to said winding.

Claim 5

A magnetic head comprising: first and second half-core members, said half-core members each including a front face, and four side faces perpendicular thereto; a non-magnetic layer; said first and second half-core members being assembled together with respective ones of said side faces adjacent one another and with said non-magnetic layer interposed therebetween to form a front working surface of the head with a planar working gap therein; at least one winding mounted on said first and second half-core members; said front faces of said first and second half-core members cooperatively defining said front working surface, said half-core members each being provided with a cavity extending in part in said front face, in one of said side surfaces adjacent to and in the side face remote from the side face forming said gap, said cavity having a bounding edge at said front face which constitutes the edge of said front working surface, said bounding edges of each of said core halves forming an exponential curve about the plane of said working gap, with the curves being symmetrically disposed about the plane of the working gap; a hollow cover member having at least one slot which receives said first and second half-core members, said slot extending beyond said bounding edges to expose said front surfaces of said half-core members beyond said bounding edges, a non-magnetic adhesive material filling said cavities and forming a continuous surface with said front working surface which is exposed through said slot; and terminals mounted in said hollow member and electrically coupled to said winding.

Claim 6

A magnetic head comprising: first and second half-core members, said half-core members each including a front face, and four side faces perpendicular thereto; a first non-magnetic layer; said first and second half-core members being assembled together with respective ones of said side faces adjacent one another and with said first non-magnetic layer interposed therebetween to form a first front working surface of the head with a first planar working gap therein; at least one winding mounted on said first and second half-core members; third and fourth half-core members each including a front face and four side faces perpendicular thereto; a second non-magnetic layer; said third and fourth half-core members being assembled together with respective ones of said side faces adjacent one another and with said second non-magnetic layer interposed therebetween to form a second front working surface of the head with a second planar working gap therein, said first and second working gaps being aligned in a common plane, at least one further winding mounted on said third and fourth half-core members; said front surfaces of said first and second half-core members and said third and fourth half-core members co-operatively defining said first and second front working surfaces, said half-core members each being provided with a cavity extending in part in said front face, in one of said side faces adjacent to and in that one of the side faces remote from the side face forming said respective gap, said cavity having a bounding edge at said front face which constitutes the edge of said respective front working surface, said respective bounding edges of said core halves combining to form bell-shaped curves symmetrically disposed about the plane of said respective working gap; said bounding edges of said first, second, third and fourth half-core members being located symmetrically with respect to a mid plane of said first, second, third and fourth half-core members, said mid plane being perpendicular to said plane of said working gaps so that the distance between said symmetrical curves increases as said curves extend from the plane of the working gap; a hollow cover member having at least two slots, said hollow member receiving said half-core members, said slots extending beyond said bounding edges to expose said front surfaces of said half-core members beyond said bounding edges; a non-magnetic adhesive material filling said cavities and forming a continuous surface with said front working surface which is exposed through said slots; and terminals mounted in said hollow member and electrically coupled to said windings.

Claim 7

A magnetic head comprising: first and second half-core members, said half-core members each including a front face, and four side faces perpendicular thereto; a first non-magnetic layer; said first and second half-core members being assembled together with respective ones of said side faces adjacent one another and with said first non-magnetic layer interposed therebetween to form a first front working surface of the head with a first planar working gap therein; at least one winding mounted on said first and second half-core members; third and fourth half-core members each including a front face and four side faces perpendicular thereto; a second non-magnetic layer; said third and fourth half-core members being assembled together with respective ones of said side faces adjacent one another and with said second non-magnetic layer interposed therebetween to form a second front working surface of the head with a second planar working gap therein, said first and second working gaps being aligned in a common plane, at least one further winding mounted on said third and fourth half-core members; said front surfaces of said first and second half-core members and said third and fourth half-core members co-operatively defining said first and second front working surfaces, said half-core members each being provided with a cavity extending in part in said front face, in one of said side faces adjacent to and in that one of the side faces remote from the side face forming said respective gap, said cavity having a bounding edge at said front face which constitutes the edge of said respective front working surface, said respective bounding edges of said core halves combining to form bell-shaped curves symmetrically disposed about the plane of said respective working gap; said bounding edges of said first, second, third and fourth half-core members being located symmetrically with respect to a mid plane of said first, second, third and fourth half-core members, said mid plane being perpendicular to said plane of said working gaps so that the distance between said symmetrical curves increases as said curves extend from the plane of the working gap; a hollow cover member having at least two slots, said hollow member receiving said half-core members, said slots extending beyond said bounding edges to expose said front surfaces of said half-core members beyond said bounding edges; a non-magnetic adhesive material filling said cavities and forming a continuous surface with said front working surface which is exposed through said slots; and terminals mounted in said hollow member and electrically coupled to said windings.

Claim 8

A magnetic head comprising: first and second half-core members, said half-core members each including a front face, and four side faces perpendicular thereto; a first non-magnetic layer; said first and second half-core members being assembled together with respective ones of said side faces adjacent one another and with said first non-magnetic layer interposed therebetween to form a first front working surface of the head with a first planar working gap therein; at least one winding mounted on said first and second half-core members; third and fourth half-core members each including a front face and four side faces perpendicular thereto; a second non-magnetic layer; said third and fourth half-core members being assembled together with respective ones of said side faces adjacent one another and with said second non-magnetic layer interposed therebetween to form a second front working surface of the head with a second planar working gap therein, said first and second working gaps being aligned in a common plane, at least one further winding mounted on said third and fourth half-core members; said front surfaces of said first and second half-core members and said third and fourth half-core members co-operatively defining said first and second front working surfaces, said half-core members each being provided with a cavity extending in part in said front face, in one of said side faces adjacent to and in that one of the side faces remote from the side face forming said respective gap, said cavity having a bounding edge at said front face which constitutes the edge of said respective front working surface, said respective bounding edges of said core halves forming exponential curves about the plane of said respective working gap with the curves being symmetrically disposed about the plane of the respective working gap; said bounding edges of said first, second, third and fourth half-core members being located symmetrically with respect to a mid plane of said first, second, third and fourth half-core members, said mid plane being perpendicular to said plane of said working gaps so that the distance between said symmetrical curves increases as said curves extend from the plane of the working gap; a hollow cover member having at least two slots, said hollow member receiving said half-core members, said slots extending beyond said bounding edges to expose said front surfaces of said half-core members beyond said bounding edges; a non-magnetic adhesive material filling said cavities and forming a continuous surface with said front working surface which is exposed through said slots; and terminals mounted in said hollow member and electrically coupled to said windings.

Claim 9

A magnetic head comprising: first and second half-core members, said half-core members each including a front face, and four side faces perpendicular thereto; a first non-magnetic layer; said first and second half-core members being assembled together with respective ones of said side faces adjacent one another and with said first non-magnetic layer interposed therebetween to form a first front working surface of the head with a first planar working gap therein; at least one winding mounted on said first and second half-core members; third and fourth half-core members each including a front face and four side faces perpendicular thereto; a second non-magnetic layer; said third and fourth half-core members being assembled together with respective ones of said side faces adjacent one another and with said second non-magnetic layer interposed therebetween to form a second front working surface of the head with a second planar working gap therein, said first and second working gaps being aligned in a common plane, at least one further winding mounted on said third and fourth half-core members; said front surfaces of said first and second half-core members and said third and fourth half-core members co-operatively defining said first and second front working surfaces, said half-core members each being provided with a cavity extending in part in said front face, in one of said side faces adjacent to and in that one of the side faces remote from the side face forming said respective gap, said cavity having a bounding edge at said front face which constitutes the edge of said respective front working surface, said respective bounding edges of said core halves forming exponential curves about the plane of said respective working gap with the curves being symmetrically disposed about the plane of the respective working gap; said bounding edges of said first, second, third and fourth half-core members being located symmetrically with respect to a mid plane of said first, second, third and fourth half-core members, said mid plane being perpendicular to said plane of said working gaps so that the distance between said symmetrical curves increases as said curves extend from the plane of the working gap; a hollow cover member having at least two slots, said hollow member receiving said half-core members, said slots extending beyond said bounding edges to expose said front surfaces of said half-core members beyond said bounding edges; a non-magnetic adhesive material filling said cavities and forming a continuous surface with said front working surface which is exposed through said slots; and terminals mounted in said hollow member and electrically coupled to said windings.