Ferrite core magnetic head with improved reinforcement filler
First Claim
Patent Images
1. A magnetic head for magnetic recording and reproducing systems, comprising:
- a core of an oxide ferromagnetic material shaped to provide a magentic gap with a width corresponding to the track width of a magnetic tape two which the the head is to be applied, resulting in the presence of depressions in said core in regions adjacent to said magnetic gap in the width direction of said magnetic gap; and
a solid mass of a reinforcement filling material which fills up each of said depressions, said filling material being a mixture of a glass composition the thermal expansion coefficient of which is nearly equal to the thermal expansion coefficient of said oxide ferromagnetic material and a powdered electrically conducting and nonmagnetic material, said filling material having been once in a fluidized state in each of said depressions.
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Abstract
A ferrite core magnetic head useful in a video tape recorder is reinforced in regions near its magnetic gap by the application of a filling material which is a mixture of a glass composition such as a lead glass and a powdered electrically conducting and nonmagnetic material such as a conducting metal oxide or a metal. In thermal expansion coefficient, the glass for the filling material must be comparable to the core material of the head. The use of this filling material precludes cracking of the core by heat treatments during fabrication and deposition of dust on the head surface during operation.
16 Citations
14 Claims
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1. A magnetic head for magnetic recording and reproducing systems, comprising:
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a core of an oxide ferromagnetic material shaped to provide a magentic gap with a width corresponding to the track width of a magnetic tape two which the the head is to be applied, resulting in the presence of depressions in said core in regions adjacent to said magnetic gap in the width direction of said magnetic gap; and a solid mass of a reinforcement filling material which fills up each of said depressions, said filling material being a mixture of a glass composition the thermal expansion coefficient of which is nearly equal to the thermal expansion coefficient of said oxide ferromagnetic material and a powdered electrically conducting and nonmagnetic material, said filling material having been once in a fluidized state in each of said depressions. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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Specification