Abstract A magnetic head assembly having a pair of pole pieces defining a nonmagnetic gap, and a ferrite yoke which has a winding wound thereon and an airgap. The yoke is in the shape of a modified cylinder. A part of the normal cylinder is cut off along an oblique flat plane to form said modified cylinder and the area of the top end flat plane is smaller than that of the bottom end flat plane. The line of the intersection of said oblique flat plane and the bottom end flat plane either does not cross the inner periphery of said normal cylinder or crosses the inner periphery so that the crossed part of the inner periphery does not exceed the width of said airgap. The airgap is positioned along with the mirror-symmetry plane of said modified cylinder so as to include the center point of said line of intersection, and said pair of pole pieces is attached to said oblique plane of said yoke in such a way that said nonmagnetic gap is essentially in said mirror-symmetry plane.
A magnetic head assembly comprising a ferrite yoke having the shape of a modified annular cylinder having a plane of symmetry which divides said modified cylinder as a whole into two identical mirror symmetrical parts, a central bore, the axis of which is included in said plane of symmetry, an airgap extending between the outer annular surface and said central bore of said cylinder and along said plane of symmetry at one side of the wall of said cylinder, and an oblique flat surface intersecting the flat end surface at one end of said cylinder on a line lying between the outer and inner peripheries of said cylinder, and on the same side of the axis of said central bore as said airgap, said oblique flat surface intersecting the other flat end surface on a line lying between the axis of said central bore and the outer periphery of said cylinder on the opposite side of said axis from said airgap; a pair of pole pieces attached to said oblique flat surface at said airgap and defining between them a nonmagnetic gap including said plane of symmetry; and a winding around said ferrite yoke.
Claim 2
Dependent Claim
194 words
A magnetic head assembly comprising a ferrite yoke having the shape of a modified annular cylinder having a plane of symmetry which divides said modified cylinder as a whole into two identical mirror symmetrical parts, a central bore, the axis of which is included in said plane of symmetry, an airgap extending between the outer annular surface and said central bore of said cylinder and along said plane of symmetry at one side of the wall of said cylinder, and an oblique flat surface intersecting the flat end surface at one end of said cylinder on a line lying between the outer and inner peripheries of said cylinder, and on the same side of the axis of said central bore as said airgap, said oblique flat surface intersecting the other flat end surface on a line lying between the axis of said central bore and the outer periphery of said cylinder on the opposite side of said axis from said airgap; a pair of pole pieces attached to said oblique flat surface at said airgap and defining between them a nonmagnetic gap including said plane of symmetry; and a winding around said ferrite yoke.
Claim 3
Dependent Claim
20 words
A magnetic head assembly as claimed in claim 1 in which said central bore is coaxial with said outer periphery.
Claim 4
Dependent Claim
29 words
A magnetic head assembly as claimed in claim 1 in which said central bore is offset from the center of said outer periphery in a direction toward the airgap.
Claim 5
Dependent Claim
22 words
A magnetic head assembly as claimed in claim 1 wherein said pair of pole pieces consists essentially of a ferromagnetic metallic alloy.
Claim 6
Dependent Claim
22 words
A magnetic head assembly as claimed in claim 1 wherein said cylinder has a height larger than one-half of its outside diameter.
Claim 7
Dependent Claim
21 words
A magnetic head assembly as claimed in claim 5 wherein said cylinder has a height smaller than twice said outer diameter.