JPH022203B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a magnetic head, and more particularly to a magnetic head that uses a molded core support and has an improved structure for grounding between the core and the case.

A conventional magnetic head has been constructed as shown in FIGS. 1 and 2, for example. That is, in both figures, the cores are indicated by numerals 1 and 1, and in this embodiment, they are illustrated as two-channel magnetic heads arranged in pairs with shielding plates 2 and 2 in between. And cores 1, 1 and shielding plates 2, 2
are mounted using zinc die-cast supports 3,3 to dimension the track width and track spacing.

Bobbins 4, 4 each having a coil 4a wound thereon are fitted and fixed to the bases of the cores 1, 1, respectively.
a, 4a are connected to terminal conductors 6, 6, respectively, via a terminal block 6a. The head element constructed in this manner is inserted into the shield case 5 and integrated by injecting molten resin.
The reference numeral 7 in FIG. 1 is a leaf spring for positioning the head body.

However, if such a structure is adopted, it is difficult to integrate parts that require insulation from other parts, such as the bobbins 4, 4 and terminal conductors 6, 6, with the supports 3, and the number of parts increases. It takes a lot of assembly man-hours,
As a result, the cost was high.

In order to improve this drawback, a proposal has been made to make the supports 3, 3 molded supports so that they can be integrated with the bobbin and the terminal conductor. However, if this structure is adopted, it is not possible to ground with a low resistance value between the cores 1, 1 and the case 5, and if the mold support is made conductive, the mechanical strength required for the support cannot be achieved. The drawback was that it was impossible to satisfy them.

The present invention has been made to eliminate the above-mentioned drawbacks of the conventional technology, and uses a mold support to ensure that the core and the case are grounded, that is, the core and the case are electrically connected. In addition to making it possible to have a configuration that conducts to
The object of the present invention is to provide a magnetic head configured so that a bobbin, a terminal conductor, and a support can be integrated.

In order to achieve the above object, the present invention uses a molded support made of synthetic resin as the support, and uses an elastic plate such as a leaf spring to position and fit the core element inside the shield case. A structure has been adopted that allows for reliable grounding between the core and the case.

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

3 and 4 illustrate one embodiment of the present invention, and in each figure, the same or corresponding parts as in FIGS. 1 and 2 are given the same reference numerals, and their explanation will be omitted.

In this embodiment, the supports 3, 3 are molded from an insulating synthetic resin, and the bobbin 4 and the terminal conductors 6, 6 are integrally molded together with the support 3. On the other hand, the reference numeral 7 is a conductive leaf spring made of, for example, phosphor bronze, and the leaf spring 7 has a base part 7a bent into a chevron-shaped cross section, and an extension part 7b extending from the base part 7a to one side. and this extension part 7b
A bent portion 7c that is bent downward is formed at the tip. As is clear from FIG. 3, this bent portion 7c is formed into a substantially U-shape, and a large number of protrusions or irregularities a are formed on its inner circumferential surface.

Cores 1 and 1 using mold supports 3 and 3
The shielding plates 2, 2 are placed against each other, and the base 7a of the leaf spring 7 is placed on the upper surface of the mold support 3 in an integrated state. Then, the bent portion 7c is fitted along the outer circumferential surface of the cores 1, 1 facing outward from the tips of the mold supports 3, 3. Occasionally, there are a large number of free rises a on the inner edge of the curved portion 7c.
is formed, so that if the amount of protrusion of the protrusion a is appropriately selected, it will definitely come into contact with the outer circumferential surfaces of the cores 1, 1, and electrical connection will be maintained.

In this state, the electrical contact part b is maintained,
The base 7 of the leaf spring may be fitted into the shield case 5 as it is, or the base 7 of the leaf spring may be bent into a chevron shape as shown by the symbol c in FIGS. 3 and 4.
When the leaf spring 7 is fitted into the shield case 5 with an appropriate flat part formed on the ridgeline part a, the flat part c of the leaf spring 7 comes into contact with the inner peripheral surface of the shield case 5, and the bent part 7c is connected to the core 1, Since it is in contact with 1, it is completely grounded. In this state, the molten resin may be filled into the shield case 5, and the whole may be integrally molded and fixed.

Since this embodiment is configured as described above,
Even if a molded support is used, it is possible to easily create a structure that connects the core and the case by using a plate spring for positioning the head element, and by using a molded core, the bobbin and terminal conductor can be integrated. The number of parts can be significantly reduced, the number of assembly steps can be reduced, and costs can be significantly reduced. Further, the shape of the leaf spring 7 for positioning does not necessarily have to be the shape shown in the figure, but any shape can be used as long as it can establish a ground between the cores 1, 1 and the shield case 5. may be adopted.

As is clear from the above description, according to the present invention, the grounding between the core and the shield case can be established using the elastic plate that positions and fixes the mold support. In addition to reducing the number of parts and assembly man-hours due to the integration of the bobbin and terminal conductor, it is now extremely easy to ground between the core and case when using a mold support, which was previously difficult. This has the excellent effect of realizing a significant cost reduction and ensuring reliable grounding.

[Brief explanation of drawings]

Figure 1 is a vertical side view explaining the conventional structure, Figure 2
The figure is a cross-sectional view taken along the line A-A in Figure 1, Figure 3 is an exploded perspective view illustrating the structure of a leaf spring and a head body, which explains one embodiment of the present invention, and Figure 4 shows how the leaf spring is attached. FIG. 3 is a perspective view showing the head element and the shield case in a closed state. 1...core, 2...blocking plate, 3...support,
4... Bobbin, 5... Shield case, 6... Terminal conductor, 7... Leaf spring.

Claims (1)

[Claims] 1. A mold support for supporting a magnetic core is housed in a shield case together with the magnetic core, and has a conductive elastic plate for positioning and fixing the mold support in the shield case, one end of the elastic plate is brought into contact with the core, 1. A magnetic head characterized in that the core and the case are electrically connected by bringing the other end into contact with the inner surface of the shield case.