JPH043564B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to a magnetic head, and more particularly to a magnetic head in which a center core fitted with a coil bobbin is butted against side cores.

Prior Art A conventional magnetic head of this type was constructed as shown in FIGS. 1A to 1C. That is, what is indicated by the reference numeral 1 in the figure is a side core, which is formed into a roughly C-shape with angular edges as a whole.

A center core 2 formed into a prismatic shape is fitted into the side core 1, and a coil bobbin 3 around which a coil 3a is wound is fitted into the center core 2.

This center core 2 is glued with adhesive while applying a pressing force as shown by arrow F in order to improve the adhesion between the inner end indicated by reference numeral A in FIG. 1A and the inner surface of the side core 1. It was fixed.

During this fixing, both ends of the outer end of the center core 2 are abutted against both ends of the side core 1, forming a plurality of magnetic gaps indicated by B ₁ and B ₂ .

During this fixing, if the pressing force F is not constant, a gap will occur between the inner walls of the butted side cores, that is, the contact surface A, and as a result, it is difficult to stabilize the electrical characteristics. It was hot.

Purpose The present invention has been made in order to eliminate the above-mentioned conventional drawbacks, and its object is to provide a magnetic head that has an extremely simple structure so that the center core and the side cores can be reliably brought into contact with each other. The purpose is

Embodiments Hereinafter, details of the present invention will be explained based on embodiments shown in the drawings.

FIRST EMBODIMENT FIGS. 2A to 2C illustrate the first embodiment of the present invention. In each figure, the same or corresponding parts as in FIG. do.

In this embodiment, as is clear from FIG. 2B, a protrusion 2a (flange) is formed at the base on the inner end side of the center core 2. This protrusion 2a
The reason for providing this is to increase the contact area on surface A (inner wall of the side core), which is the abutting surface between the center core and the side core, to obtain a stable contact state, and to accurately position the coil bobbin 3.

Further, protrusions 4, 4 are protruded from the edge of the coil bobbin 3 on the opposite side from the protrusion 2a side.
The amount of protrusion of this protrusion 4 is determined by the amount of protrusion between the outer edge of the coil bobbin 3 and the abutting surface of the side core 1 when the coil bobbin 3 is fitted into the center core 2 and the protrusion 2a and the base of the coil bobbin 3 come into contact.
The distance is slightly larger than the distance between the inner surfaces of B ₁ and B ₂ sides.

Therefore, when the center core 2 fitted with the coil bobbin 3 is fitted into the side core 1, the protrusions 4,
As shown in FIG. 2A, the protrusion 4 can be attached in a state in which it is pressed against the inner surface of the distal end side of the side core 1 while slightly elastically deforming the protrusion 4 .

In this state, the edge of the center core 2 on the protrusion 2a side is strongly pressed against the abutting surface A surface via the protrusion 4 and the coil bobbin 3.

At this time, the pressing force on the A side of the center core 2 is applied uniformly, and no gap is created between the abutting surfaces. Therefore, electrical characteristics can be stabilized.

Second Embodiment FIGS. 3A to 3C illustrate a second embodiment of the present invention. In this embodiment, the coil bobbin 3
An L-shaped bent portion 3b that is continuous with the flange of the coil bobbin is formed integrally with the proximal end thereof.
A protrusion 4 is provided on the inner surface of the bent portion 3b.

As shown in FIG. 3B, the bent portion 3b is provided in an inclined state toward the coil bobbin 3, and in the free state, the distance between the protrusion 4 and the flange of the coil bobbin is smaller than the wall thickness of the side core 1. Slightly smaller.

Therefore, the center core 2 is installed with the center core 2 and the coil bobbin 3 fitted together, and the bent portion 3
b is guided to the outside of the side core 1 while being elastically deformed, and the protrusion 4 is guided to the outside of the side core 1 as shown in FIG. 3A.
If contact is made from the outside, the elasticity of the bent portion 3b will apply a pressing force to the protruding portion 2a of the center core 2 against the A side via the coil bobbin 3.

Even if such a structure is adopted, the abutting surfaces of the center core 2 and the side cores 1 are in uniform contact, and no gap is created, so that the electrical characteristics of the magnetic head can be stabilized.

Effects As is clear from the above description, according to the present invention, a magnetic head is provided in which a center core equipped with a coil bobbin is accommodated in a substantially C-shaped side core, and a plurality of magnetic gaps are formed in the C-shaped opening. A flange is formed on the center core, and at least one protrusion is formed on one side of the coil bobbin, and the protrusion is brought into contact with a side core to press the flange of the center core with the other side of the coil bobbin. Since one end of the core is pressed against the inner wall of the side core and abutted against each other, there is no gap between the abutting surfaces and a magnetic head with stable electrical characteristics can be obtained.

[Brief explanation of drawings]

1A to 1C are a plan view, an exploded perspective view, and an overall perspective view illustrating a conventional structure; FIGS. 2A to 2C are a plan view, an exploded perspective view, and an overall perspective view illustrating an embodiment of the present invention; 3A to 3C are a plan view, an exploded perspective view, and an overall perspective view illustrating another embodiment of the present invention. 1... Side core, 2... Center core, 2a
...Protrusion (flange), 3...Coil bobbin, 3b
...Bend portion, 4...Protrusion.

Claims (1)

[Claims] 1. A magnetic head in which a center core with a coil bobbin attached thereto is accommodated in a substantially C-shaped side core, and a plurality of magnetic gaps are formed in the C-shaped opening, in which a flange is formed in the center core and one side of the coil bobbin is formed. A magnetic head characterized in that at least one protrusion is formed on the coil bobbin, and by bringing the protrusion into contact with the side core, the other side of the coil bobbin presses the flange of the center core, thereby pressing one end of the center core against the inner wall of the side core. .