JPS6134572Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a magnetic head, and more particularly to a double gap type magnetic head such as an erasing head.

Conventionally, in the manufacturing process of erasing heads and the like having a relatively wide gap interval, the gap was generally created by sandwiching a gap material such as a plastic film such as polyester or a non-magnetic metal seal between the head cores.

FIG. 1 shows such a conventional magnetic head.
In this figure, a bobbin 3 with a winding 2 is fitted into the central I-shaped core 1, and C-shaped cores 4A and 4B are attached to both sides of the I-shaped core 1 with gap material 5 at their tips.
It is designed to be butted together with the two in between.

In the case of FIG. 1, a sheet or roll of film is punched into a desired shape by press punching.
The gap material 5 is made by processing such as cutting, and is sandwiched and glued, but if the gap material 5 is a thin film, it is difficult to tell if two or three films are overlapping each other during assembly, which can cause product defects. Also, since a process of sandwiching and gluing the gap material 5 between the cores is required, it is also disadvantageous in terms of workability.

The present invention aims to eliminate the above-mentioned drawbacks and to provide a magnetic head which is easy to manufacture and assemble, and which can reduce the cost by integrally forming the gear spacer part with the bobbin.

Embodiments of the magnetic head according to the present invention will be described below with reference to the drawings.

In FIGS. 2 and 3, the bobbin 3A fitted into the central I-shaped core 1 made of ferrite is made of plastic, and gear spacer portions 10A and 1 are made of protrusions extending along both sides of the I-shaped core 1.
0B is integrally formed. That is, as shown in FIG. 4, gear spacer portions 10A and 10B are formed on the bobbin 3A so as to extend along the inner surface of a through hole 11 into which the I-shaped core 1 is inserted. After such a bobbin 3A is wound with wire 2, it is attached to an I-shaped core 1, and C-shaped cores 4A and 4B made of ferrite are butted and joined on both sides of the I-shaped core 1. At this time, since the gear spacer parts 10A and 10B extend to the tip of the I-type core 1, there are inevitably gear spacer parts 10A and 10B between the I-type core 1 and the C-type cores 4A and 4B.
A gap G defined by the thickness of B is formed.
Each core is joined using an adhesive or the like, and after joining, the gap surface is polished.

According to the above embodiment, the following effects can be achieved.

(1) Gear spacer part 10A, 1 on bobbin 3A
Since 0B is integrally formed, conventional gap material can be used to connect I-type core 1 and C-type cores 4A and 4B.
This eliminates the need for intervening processes, reducing manufacturing man-hours and improving assembly efficiency.

(2) Since the bobbin 3A is made of plastic, the gear spacer portions 10A and 10B can be easily molded together, and the bobbin 3A is also easy to manufacture.

(3) It is also possible to reduce costs for reasons (1) and (2) above.

As the material for the bobbin 3A, in addition to polyester, abrasion-resistant plastic can be used as required.

As described above, the present invention provides a magnetic head which can be manufactured and assembled easily by integrally forming the gear spacer part interposed between the tips of the head core and defining the gap interval with the bobbin. get.

[Brief explanation of the drawing]

Figure 1 is an exploded perspective view of a conventional magnetic head.
FIG. 2 is a perspective view showing an embodiment of the magnetic head according to the present invention, FIG. 3 is an exploded perspective view of the same, and FIG. 4 is a front view of a bobbin in the embodiment. 1...I type core, 2...Winding, 3, 3A...Bobbin, 4A, 4B...C type core, 10A, 10B
...Gear spacer part, 11...Through hole, G...
...Gap.

Claims (1)

[Scope of utility model registration request] In a magnetic head in which a C-shaped core is butted against both sides of an I-shaped core equipped with a bobbin with wire wound thereon, and a gap is provided between the I-shaped core and the tip of the C-shaped core, the I-shaped core and the C-shaped core are 1. A magnetic head characterized in that a gap spacer portion interposed between core tips and defining a gap interval is integrally formed with the bobbin.