JPH022204B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a magnetic head, and more particularly to a magnetic head in which the core and shield plate of the magnetic head can be reliably grounded to the shield case.

Conventional magnetic heads have adopted structures as shown in FIGS. 1 to 3, for example.

In FIGS. 1 to 3, reference numerals 1 and 1' indicate magnetic cores, which are held by a core support 4 with a shield plate 2 in between, and are fitted into a shield case 3. The shield plate 2 and the core 1 are in contact with each other via a spacer plate to establish electrical continuity.

When the core support 4 holding the magnetic core is fitted into the shield case 3, a leaf spring 5 bent into a chevron shape is fitted across the recesses 4a, 4a formed on the upper surface of the support 4. The leaf spring 5 is inserted in a bent state, and is held in a state in which the leaf spring 5 is bent.
When the leaf spring 5 is bent, its upper end 5a and top portion 5b come into contact with the core support 4 and the shield case 3, respectively, and the cores 1, 1', the shield plate 2, and the shield case 3 are electrically connected. . Reference numeral 6 indicates a winding wire, and 7 indicates a terminal conductor.

By the way, the core support 4, which has been fitted with the magnetic cores 1 and 1' and abutted against each other to be integrated, is inserted into the shield case 3 and fixed by filling it with resin 8 as shown in FIG. At this time, in order to integrate the resin 8 and the shield case 3, a protrusion 9 is formed from the top surface of the shield case 3, protrudes into the case, and is embedded in the resin 8 to prevent it from coming off, making it strong. We are trying to integrate.

However, when the above structure is adopted, when air bubbles a are generated from the protrusion 9 in the direction of the medium sliding surface as shown in FIG. 4, it does not function as a stopper at all, and as shown in FIG. As shown, the resin 8 including the core support 4 shifts backward, creating a gap b between it and the sliding surface of the magnetic tape, which can cause deterioration of the tape touch and damage the tape at the edge of the closed part of the case. This may cause inconveniences such as attaching the product.

In addition, the filled resin 8 may shrink when it hardens or may shrink due to a change in ambient temperature, and the resin 8 and case 3 may change from a close contact state shown in FIG. 6 to a gap as shown in FIG. 7. c occurs, and the problem arises that the plate spring 5 embedded in the resin 8 and the shield case 3 are in a non-contact state, making it impossible to connect to the ground.

The present invention has been made in order to eliminate the above-mentioned conventional drawbacks, and an object of the present invention is to provide a magnetic head having an extremely simple structure that allows reliable grounding.

In order to achieve the above object, the present invention has a structure in which a protrusion is cut and raised inward from the shield case side and press-contacted to the core support, and this protrusion is used to establish ground between the core support and the shield case. It was adopted.

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

FIG. 8 and subsequent figures show an embodiment of the present invention, and the same parts in the figures as in FIGS. 1 to 7 are denoted by the same reference numerals, and the explanation thereof will be omitted.

In the embodiment shown in FIGS. 8 to 12, protrusions 1 are attached to the upper surface of the shield case 3 at two places on the left and right sides by means of press molding or the like to face the inside of the case.
0 and 10, and bring the lower surfaces of the free end sides of these projections 10 and 10 into elastic contact with the upper surface of the core support 4, respectively, as shown in FIG. It is fixed at

When such a structure is adopted, the protruding piece 10 always presses the core support 4 as shown in the enlarged view in FIG. 11, so that the resin 8
Even if a gap c is created between the lower surface of the shield case 3 and the resin 8 due to the contraction of the resin 8, the protruding piece 10 follows the contraction of the resin 8, so it is always in contact with the core support 4, and the ground is It is maintained in good condition.

Furthermore, the contact point x between the projecting piece 10 and the core support 4
If you fix it using a laser etc., the shield case 3 and core support 4 will be fixed.
The gap b (see FIG. 5) between the magnetic head and the tape sliding surface that occurs in the conventional magnetic head does not occur, and the tape touch is not disturbed and the magnetic tape is not damaged.

13A and 13B show another embodiment of the present invention. In this embodiment, the protrusion 10 is not formed with a free end, but has a substantially U-shape downward. Since it is press-molded and both side edges are open, this punched part 11 can be elastically deformed.

14A and 14B show still another embodiment of the present invention, in which a cap-shaped protrusion 12 is provided to protrude inward from the top surface of the case 3. .

In the embodiments shown in FIGS. 13 and 14 described above, the punched portion 11 and the protruding portion 12 need to protrude inward to the extent that they press the core support, and the core support 4 It is preferable to fix it by means such as welding. Even if such a structure is adopted, effects similar to those of the above-described embodiment can be obtained.

As is clear from the above description, according to the present invention, a configuration is adopted in which a protrusion is formed from the shield case side toward the inside of the case, and the protrusion and the core support are maintained in contact with each other. Therefore, the core can be reliably secured between the case and the core support with an extremely simple structure.

[Brief explanation of drawings]

Figures 1 to 3 are perspective views explaining the conventional structure;
Exploded perspective view and longitudinal side view, Figures 4 and 5
The figures are a vertical side view showing the shortcomings of the vertical structure,
6 and 7 are partially enlarged sectional views for explaining other drawbacks of the vertical structure, FIGS. 8 to 12 show an embodiment of the present invention, and FIG. 8 is an overall perspective view. ,
Figure 9 is a perspective view of the case, Figure 10 is a vertical side view, Figures 11 and 12 are partially enlarged cross-sectional views explaining the functions, Figures 13A, B, and 14.
Figures A and B are an enlarged sectional view of a case and a perspective view of the case, respectively, showing different embodiments of the present invention. 1, 1'...magnetic core, 3...shield case,
4...Core support, 8...Resin, 10...Protrusion piece, 11...Punching part, 12...Protrusion part.

Claims (1)

[Claims] 1. A protrusion that is elastically deformed by breaking a part of the shield case of the magnetic head to form an open part is provided inside the shield case, and the protrusion and the core support are brought into pressure contact with each other. A magnetic head characterized by: 2. The magnetic head according to claim 1, wherein the protrusion and the core support are fixed by welding means.