JP2517983Y2 - Magnetic head shield ring - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention is a shield that is curvedly formed from one end to the other end so as to form a ring shape as a whole and covers a magnetic head such as a floppy disk device. Regarding the ring.

[Prior Art] Conventionally, various types are known in which a shield ring is attached around a slider in order to avoid an influence of an external magnetic field on a magnetic head for a floppy disk.

Known shield rings include those shown in FIGS. 5 to 7. As shown by the reference numeral 1 in the figure, this shield ring is formed into a shape that covers the periphery of the magnetic head assembly 2 by bending a flat plate. The magnetic head assembly 2 is composed of a magnetic head 3 and a slider 4, and is attached to a gimbal spring 5 for use. The one end 1a and the other end 1b, which are the joints of the shield ring 1, are arranged to face each other with a slight gap, and the shield ring itself is attached to the gimbal spring 5 with an adhesive or a synthetic resin (see FIG. 6, (See FIG. 7).

As the shield ring, there are those in which the seams are overlapped, those in which the seams are overlapped in two or three layers, or those in which the shield ring is formed into a seamless tubular shape by press molding.

[Problems to be Solved by the Invention] However, each of the above shield rings has the following problems.

(1) In the case of the shield ring 1 as shown in the drawing, the joint is easy to open, and the joint is easily bent at the time of mounting, which makes it difficult to handle. Moreover, when the seam is widened, there is a problem that external noise is easily picked up.

(2) In the case of a shield ring in which seams are overlapped in two or three layers, an extra material for the shield ring is required for the overlap, and the weight of the shield ring itself increases, so that the gimbal spring 5 There is a problem that extra load is applied to the.

(3) In the case of a shield ring in the form of a seamless tube formed by press molding, the processing steps are complicated, resulting in waste of the shield ring material and high processing costs.

This invention solves such a problem,
An object of the present invention is to provide a shield ring which has a simple structure, is easy to process, has strength, and is easy to handle.

[Means for Solving the Problems] A shield ring for a magnetic head according to the present invention is a shield ring that is curvedly formed from one end to the other end so as to form a ring shape as a whole and covers the periphery of the magnetic head. One end portion and the other end portion are formed in a concavo-convex shape that fits with each other and are coupled to each other.

[Operation] In the shield ring of the present invention, the strength of the shield ring itself is improved by keeping the shape of the shield ring itself between the concave and convex portions at the one end and the other end that are fitted and coupled to each other. In addition to making it easier to handle, the circumference of the magnetic head is completely covered to avoid the influence of an external magnetic field.

[Embodiment] An embodiment of the present invention will be described below with reference to FIGS. 1 to 4. The same parts as those in the conventional example described above are designated by the same reference numerals, and the description thereof will be omitted.

In the figure, 11 is a shield ring of the present embodiment, which is formed by press-punching a plate-shaped material and bending it into a shape that covers the periphery of the magnetic head assembly 2. The dotted line in FIG. 2 represents the bent portion. The material of the shield ring 11 is a magnetic material such as permalloy, a non-magnetic metal such as copper or copper alloy, or a composite material thereof. The one end 11a and the other end 11b of the shield ring 11 are formed in an uneven shape that fits each other. There is. Waveform part on one end 11a side (hereinafter,
“One corrugated portion” means that the central portion of the shield ring 11 in the width direction (vertical direction in FIG. 3) is the other end portion 11.
The corrugated portion on the b side (hereinafter, referred to as "the other corrugated portion") is formed so as to largely swell, and the other corrugated portion has one corrugated portion on both sides in the width direction of the shield ring 11. It is formed so as to bulge slightly toward it. Then, when these corrugated portions are fitted to each other, the central portion of one corrugated portion is deeply inserted into the other corrugated portion side, and both side portions of the other corrugated portion are shallowly recessed into the one corrugated portion side. (See FIG. 3).

When handling the thus-formed shield ring 11, both corrugated portions are fitted to each other, and the fitted portions are joined by various means to preliminarily form the joint between the one end 11a and the other end 11b. Be integrated. In the case of this example, as a method of connecting both waveform parts, "x" in FIG.
A method of pressing the marked portion, that is, the central portion of one corrugated portion from the front and back sides of the paper surface in the figure is adopted. In the case of this pressing, the central portion of one corrugated portion is plastically deformed, especially in the vertical direction in FIG. 3, so that the fitted state with the other corrugated portion is firmly connected.

The shield ring 11 having the seam portion previously coupled thereto is attached to the gimbal spring 5 so as to cover the periphery of the magnetic head assembly 2. Therefore, there is no problem that the seam portion is opened at the time of mounting.
Further, in the case of this example, the attachment device of the shield ring 11 in the gimbal spring 5 is provided with a positioning hole 5a, and the shield ring 11 is provided with a leg portion 11c fitted into the hole 5a. . The leg portion 11c is formed integrally with the shield ring 11 at the same time as punching the shield ring 11 or by subsequent processing.
When attaching the shield ring 11 to the gimbal spring 5, the leg 11c is fitted into the hole 5a to position the shield ring 11 on the gimbal spring 5, as shown in FIG. Fix with resin or the like. Therefore, the shield ring 11 can be reliably fixed in place, and the adhesive or the like also passes through the hole 5a to the side opposite to the shield ring mounting surface of the gimbal spring 5, so that the mounting strength of the shield ring 11 is improved. Can be increased. It should be noted that the shield ring 11 normally covers the periphery of the magnetic head assembly 2 after the magnetic head assembly 2 is attached to the gimbal spring 5.
Attached to.

Since the shield ring 11 thus mounted on the gimbal spring 5 is not opened because the joint is joined, the adverse effect of the external magnetic field on the magnetic head 3 can be reliably prevented.

The irregularities formed on the ends 11a and 11b of the shield ring 11 are not limited to the corrugations of the above-described embodiments, and are arbitrary, as long as they are shapes that fit with each other. Also,
As a joining method for these fitting portions, not only the joining method by pressing as in the above-mentioned embodiment but also various joining methods by welding, soldering or the like can be adopted.

[Effect of Invention] As described above, the shield ring of this invention is
Since one end portion and the other end portion corresponding to the joint portion are formed in a concavo-convex shape, and the concavo-convex portions are connected to each other, the following effects are achieved.

Since the seam is integrally connected, it has excellent strength and is easy to handle.

Even when the shield ring itself is attached, the joint portion does not separate, so that the attachment workability is good, and the influence of the external magnetic field can be avoided by completely covering the circumference of the magnetic head.

Since the seam portion has a simple fitting structure in which concave and convex portions are not fitted to each other and there is no overlapping portion, the length of the shield ring itself is the minimum necessary length for covering the magnetic head. Therefore, since there is no overlapping portion, it is possible to eliminate the waste of material and reduce the weight.

The concavo-convex shape of the seam portion can be easily formed by pressing or the like, and the productivity is good.

[Brief description of drawings]

1 to 4 are views for explaining one embodiment of the present invention, and FIG. 1 is a perspective view in an attached state,
FIG. 2 is a developed view of a main part, FIG. 3 is a side view, and FIG. 4 is an explanatory view of a mounting method for a gimbal spring. 5 to 7 are views for explaining a conventional example, FIG. 5 is a perspective view in a mounted state, FIG. 6 is an explanatory view of a mounting method for a gimbal spring, and FIG. 7 is a gimbal spring. It is a perspective view showing the state where it was attached. 11 …… Shield ring, 11a …… One end, 11b …… The other end, 2
...... Magnetic head assembly, 3 ...... Magnetic head, 4 ...... Slider, 5 ...... Gimbal spring.

Claims (1)

(57) [Scope of utility model registration request] 1. A shield ring for covering a magnetic head, which is curved so as to form a ring shape as a whole by connecting one end and the other end where recesses and protrusions are fitted to each other. The one end and the other end are plastically deformed by external stress applied to the central portion of the surface of the convex portion from above or below the surface in a state where the concave portion and the convex portion are fitted to each other. Magnetic head shield ring characterized by being coupled by