Funai Electric Company Ltd.

Kiyoshi Matsui

Atsushi Shibata

Yoshinobu Umaji

The invention provides a simple method for forming a gap for an erasure head to improve the quality of this erasure head. A front coreconstituting an erasure head H includes in configuration two magnetic substancesand a magnetic gapmade of a non-magnetic substance arranged between these two magnetic substances, in which the gapmade of the non-magnetic substance is bonded by adhesion or welding between those two magnetic substances. By this method, the gap can be formed free of an air bubble, with good mass-productivity, and inexpensively as compared to a prior art method of forming a gap by glass bonding.

Method for forming magnetic gap of video signal erasure head, erasure head, and video recorder having the same

An audio/control head for used in a Video Cassette Recorder or the like has a core holder arranged to include positioning portions and for determining the pitch length P and pressing tabs having an elasticity for pressing inwardly cores members and against the positioning portions and from the outer side. As the cores members and are held directly on the positioning portions and , they are inwardly pressed by the pressing tabs . Then, the core pitch p is precisely determined between the audio core and the control core without using a particular jig during the assembly. The overall number of jigs required for mounting the cores to the core holder can be reduced. Also, the core pitch P can be improved in the accuracy and the characteristics of the head will be consistent.

Audio/control head and method of assembling cores of the head

In a mounting structure for mounting a conductive shielding case, accommadating therein an audio magnetic head, to a chassis via of an adjusting plate, columnar protrusions formed on both side surfaces of the shielding case are engaged with groove portions formed on cut and raised pieces of the adjusting plate. With this arrangement, it is possible to fix the shielding case and the adjusting plate. Thus it is possible to fix the shielding case to the adjusting plate without using screws, and thereby be decrease the cost of parts and manufacture.

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Koide-machi, Japan

Kiyoshi Matsui