JP2586927Y2 - Magnetic disk drive - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic disk drive, and more particularly to a magnetic disk drive which can be suitably applied to, for example, a thinly formed hard disk drive.

[0002]

2. Description of the Related Art Conventionally, various types of magnetic disk devices have been put into practical use, and magnetic disk devices using a flexible disk, hard disk, magneto-optical disk, or the like as a recording medium are well known. These magnetic disk devices may be affected by an external magnetic field depending on the installation condition, and the worst case may occur such that information magnetically recorded on the rotating magnetic medium is destroyed.

That is, since a magnetic disk device is used as a peripheral device of a computer, the above-mentioned situation often occurs, for example, when the magnetic disk device is installed near a display device that generates a strong magnetic field. Therefore, a magnetic disk device is built in a case made of a permalloy plate material having a magnetic shielding function and the like, and a magnetic head portion particularly susceptible to an external magnetic field is magnetically shielded.

On the other hand, especially in a hard disk device, once the hard disk medium is set in the storage box, it cannot be easily taken out. Therefore, great care is taken in handling the hard disk medium in the manufacturing process. For this purpose, for example, as disclosed in JP-A-64-57479 and JP-A-3-14800, a magnetic shield plate member is disposed in a case so as to face a magnetic head, or a permalloy plate is provided. Measures have been taken, such as incorporating a hard disk medium in a sealed storage box made of material in the initial process.

[0005]

However, a case made of a permalloy plate material having a magnetic shielding function as described above is expensive, and in a magnetic disk drive, a portion other than a magnetic head portion which is easily affected by an external magnetic field is used. It is uneconomical because it uses a magnetic shield. Also, when this case is made of relatively inexpensive aluminum or the like, in order to ensure magnetic shielding, the whole or
Although it is necessary to partially increase the wall thickness, in recent years, there has been a problem that the reduction in thickness and thickness is difficult in an inexpensive case made of aluminum or the like due to the demand for reduction in size and thickness. Therefore, the magnetic disk drive of the present invention has been made in view of the above-mentioned problems, and its purpose can be configured at low cost.
An object of the present invention is to provide a magnetic disk device that can be made thinner.

[0006]

Means for Solving the Problems and

In order to solve the above-mentioned problems and achieve the object, the present invention incorporates a magnetic recording / reproducing magnetic head for a hard disk which is a rotating magnetic medium in a closed housing made of a resin material having poor magnetic shielding properties. A magnetic disk drive including the magnetic head, wherein the closed housing box is formed to have a wall having a predetermined thickness, and a plate member for a magnetic shield having an area of an operating range of the magnetic head is provided by the magnetic head. In order to embed the plate member, a concave portion having a bottom surface substantially coinciding with the plate member is integrally formed at a portion facing the magnetic head, and the plate member is embedded in the concave portion. Preferably, the closed housing box is an injection-molded product. With the above configuration, the sealed container formed of an inexpensive material having poor magnetic shield characteristics is formed to have a small dimension in the thickness direction, and works to ensure the magnetic shield characteristics of the sealed container.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the magnetic disk drive of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a fragmentary plan view of the hard disk drive of the first embodiment. As shown in FIG. 1, the hard disk drive has most components mounted on a base 2 serving as a mounting base for various mechanical components. In this configuration, a completed product is obtained by screwing the case body 1 into a screw hole provided on the outer peripheral edge of the base 2.

A hard disk medium 3 indicated by a two-dot chain line in the figure is provided on the base 2 so as to be rotatable at a high speed, and a magnetic head 5 for performing magnetic recording and reproduction on the hard disk medium 3 is positioned at solid and broken lines. It has a known configuration that is driven in the directions of arrows A and B to move. For this drive, the magnetic head 5 is fixed to an arm 6 that is rotatable around a rotation shaft 6a. The arm 6 is integrally provided with a coil (not shown). The coil is arranged between the magnets 7, and the coil is driven in the directions of the arrows A and B by appropriately energizing the coil. Things.

The base 2 is further fixed with a substrate 9 on which a connector 10 is integrally provided and an actuator 8 for locking the magnetic head 5 at a predetermined position while performing drive control and electric signal processing. Also, the magnetic head 5 covers a range in which the magnetic head 5 moves to the positions shown by the solid line and the broken line.
A magnetic shield plate 4 made of a permalloy plate or the like shown by a broken line in the drawing is provided inside the case body 1.

Next, FIG. 2A is an external perspective view of the case body 1, and FIG. 2B is a view taken along the line XX of FIG. 2A. In FIG. A bottom surface 1b having a complicated internal shape as shown in the drawing is formed so as to keep a necessary minimum interval with respect to the above-mentioned built-in components, while having substantially the same external shape as that of FIG. The edge 1c of the case body 1 is formed over substantially the entire circumference, and the above-mentioned screw holes 1d are formed at five places. Further, a recess 1a is formed in a range covering the range in which the magnetic head 5 moves to the positions shown by the solid line and the broken line, and the magnetic shield plate 4 is embedded. The magnetic shield plate 4 is buried so as to be substantially flush with the bottom surface 1b of the case body 1 as shown in FIG.

By fixing the case 1 described above to the base 2, the magnetic shield of the magnetic head 5, which is easily affected by an external magnetic field, can be effectively performed. Further, by embedding in the concave portion 1a, the thickness of the case body 1 is not changed, so that the thickness does not change, so that the thickness can be reduced. here,
Of course, the magnetic shield plate 4 may be fixed from the outside of the case body 1, but preferably the inside is close to the magnetic head. Therefore, the case body 1 can be made of any material, and the case body 1 can be formed of an injection resin molded product. In this case, instead of embedding the magnetic shield plate 4, a metal filter having a magnetic shielding function is used. The case body may be formed by molding resin containing two colors.

FIG. 3 is a fragmentary plan view of a flexible disk drive according to a second embodiment. As shown, the flexible disk drive has a magnetic head 5 driven in the direction of the arrow in the figure. The area covering the magnetic head 5 is magnetically shielded by the magnetic shield plate 4. Even with the above configuration. The magnetic shield of the magnetic head 5 that is easily affected by an external magnetic field can be effectively performed. In the embodiment described above, the rotary recording medium is described as being limited to the hard disk and the flexible disk, but any other rotary recording medium such as a magneto-optical disk may be used as long as it is accommodated in the case. .

[0013]

[Effects of the Invention] As described above, according to the present invention,
It is possible to inexpensively manufacture a closed storage box made of a resin material having poor magnetic shielding properties, and to configure the thickness of the closed storage box to be thin in the thickness direction, and to sufficiently secure the magnetic shielding properties. A magnetic disk device that can be provided.

[Brief description of the drawings]

FIG. 1 is a fragmentary plan view of a main part of a hard disk drive according to a first embodiment.

2A is an external perspective view of a case body 1, and FIG. 2B is a view taken along line XX of FIG. 2A.

FIG. 3 is a fragmentary plan view of a principal part of the flexible disk device of the second embodiment.

[Explanation of symbols]

 1 case body, 2 bases, 3 hard disk medium, 4 magnetic shield plate, 5 magnetic head, 6 arm, 7 magnet.

 ──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-61-242378 (JP, A) Japanese Utility Model 3-14800 (JP, U) Japanese Utility Model Utility Model 3-23890 (JP, U)

Claims (2)

(57) [Scope of request for utility model registration] 1. A magnetic disk drive in which a magnetic head for magnetic recording and reproduction of a hard disk, which is a rotating magnetic medium, is incorporated in a sealed housing box made of a resin material having poor magnetic shielding properties, wherein the sealed housing box has a predetermined thickness. In order to embed a plate member for magnetic shielding having an area of the operating range of the magnetic head, facing the magnetic head, a bottom surface substantially matching the plate member is formed. A magnetic disk drive, wherein a concave portion having the same is integrally formed at a portion facing the magnetic head, and the plate member is embedded in the concave portion. 2. The magnetic disk drive according to claim 1, wherein the closed storage box is an injection molded product.