Ferrite core magnetic head with improved reinforcement filler

Details Ferrite core magnetic head with improved reinforcement filler Ferrite core magnetic head with improved reinforcement filler

1977-12-02

1979-05-01

Eddleman, Alfred H.

Dynamic magnetic information storage or retrieval

Head

Gap spacer

360122, G11B 5251

Patent

active

041527410

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.

REFERENCES:
patent: 3369292 (1968-02-01), Manders
patent: 3440360 (1969-04-01), Sugaya
patent: 3579214 (1971-05-01), Solyst
patent: 3605259 (1971-09-01), Tawara et al.
patent: 3634933 (1972-01-01), Hanak
patent: 3683126 (1972-08-01), Krause
patent: 3721000 (1973-03-01), Okamoto et al.
patent: 3928908 (1975-12-01), Case

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