Magnetic transducer heads

Claim 2

A magnetic transducer head comprising a pair of single crystal ferrite core members each having a magnetic path-forming surface of substantially a (111) plane, said magnetic pathforming surface of each member comprising the surface adjacent to the planar gap face thereof and to the tape receiving surface thereof, and the thickness of each of said core members affording a Mu conversion point not smaller than the width of the track on a record medium received on said tape receiving surface thereof, said Mu conversion point being given by the thicknesseffective permeability characteristic curve of the core member when the upper limit frequency f is taken as the parameter.

Claim 3

A magnetic transducer head as recited in claim 1 wherein said single crystal ferrite core member material is one selected from the group consisting of manganese-zinc-ferrite, nickel-zinc-ferrite, garnet, manganese-ferrite and nickel-ferrite.

Claim 4

A magnetic transducer head as recited in claim 1 wherein said track width is from 80 to 500 microns.

Claim 5

A magnetic transducer head as recited in claim 1 wherein each of said core members in the portions thereof remote from said gap face is of a thickness exceeding said width of the track of the recording medium received on said tap receiving surface thereof.

Claim 6

A magnetic transducer head as claimed in claim 1, wherein each of said core members is formed with a cut-out portion for accommodating therethrough a winding, said planar gap face formed between said two core members in such a way that a pair of end surface of one of said core members is confronted with a pair of corresponding surfaces of the other core member, both of said end surfaces being polished to optical flat.

Claim 7

A magnetic transducer head comprising a pair of single crystal ferrite core members, at least one of said core members being formed with a cut-out portion for accommodating therethrough a winding, a planar gap face formed between said two core members in such a way that a pair of end surfaces of said first mentioned core member is faced toward one lateral surface of the other core member, said end surfaces and said lateral surface being polished to optical flat, a magnetic path forming surface formed by a pair of broad surfaces of said two core members lying at right angles to the planar gap face, said magnetic path forming surface being confronted with the (111) plane of said single crystal, and a tape receiving surface formed by a pair of surfaces of said core members narrow with respect to said broad surfaces and lying, at a position adjacent to a magnetic gap which is an open end of said planar gap face, at right angles to said planar gap face and also to said magnetic path forming surface, said tape receiving surface being adapted to receive a magnetic recording tape over said surface, the thickness of said tape receiving surface adjacent to said magnetic gap being smaller than the Mu conversion point which is given by the thickness-effective permeability characteristic curve of the core member when the upper limit frequency f is taken as the parameter.

Claim 8

A magnetic transducer head comprising a pair of single crystal ferrite core members, at least one of said core members being formed with a cut-out portion for accommodating therethrough a winding, a planar gap face formed between said two core members in such a way that a pair of end surfaces of said first mentioned core member is faced toward one lateral surface of the other core member, said end surfaces and said lateral surface being polished to optical flat, a magnetic path forming surface formed by a pair of broad surfaces of said two core members lying at right angles to the planar gap face, said magnetic path forming surface being confronted with the (111) plane of said single crystal, and a tape receiving surface formed by a pair of surfaces of said core members narrow with respect to said broad surfaces and lying, at a position adjacent to a magnetic gap which is an open end of said planar gap face, at right angles to said planar gap face and also to said magnetic path forming surface, said tape receiving surface being adapted to receive a magnetic recording tape over said surface, the thickness of said tape receiving surface adjacent to said magnetic gap being smaller than the Mu conversion point which is given by the thickness-effective permeability characteristic curve of the core member when the upper limit frequency f is taken as the parameter.