JPH0294192A - Magnetic disk device - Google Patents

Abstract

PURPOSE:To electromagnetically shield a magnetic disk device from external electromagnetic noise and, at the same time, to prevent leakage of a magnetic flux from the device by coating the inner surface of the base plate of the device with a magnetic substance. CONSTITUTION:The magnetic disk device is provided with a magnetic disk 1, magnetic heads 4 which magnetically record and reproduce information on and from the disk 1, arm 5 holding the head 4 at the front end section, carriage 7 which holds the rear end section of the arm 5 and positions the head 4 against the disk 1, spindle 6 housing the disk 1, and base plate 2 which houses the carriage 7 including the heads 4 in a sealed state. The inner surface of the base plate is coated with a magnetic substance 3 having an excellent magnetic permeability. Therefore, electromagnetic noise from outside the base plate 2 can be electromagnetically sealed and, at the same time, leakage of the magnetic flux from the voice coil motor (VCM) of the driving section of the carriage 7 housed in the base plate 2 to the outside of the base plate 2 can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a magnetic disk device, and more particularly to a magnetic disk device in which a magnetic disk and a magnetic head are housed in a sealed container.

[Conventional technology]

As shown in FIG. 2, a conventional magnetic disk device in which a magnetic disk and a magnetic head are housed in a sealed container includes a plurality of magnetic disks 11 loaded on a spindle 16 at predetermined intervals, and a plurality of magnetic disks 11 loaded on a spindle 16 at predetermined intervals. a magnetic head 1 disposed corresponding to the recording surface of the magnetic head 1 for magnetically recording and reproducing information;
4, an arm 15 that holds the magnetic head 14 at its tip, and a carriage 1 that holds the rear end of the arm 15 and positions the magnetic head 14 with respect to the magnetic disk 11.
7, and a base plate 12 that seals and accommodates a spindle 16 and a carriage 17. Since the base plate 12 of the magnetic disk device configured as described above is made of aluminum with low magnetic permeability, external electromagnetic noise can pass through the base plate 12 and reach the magnetic head 14 housed inside the base plate 12. Rides as a noise, thereby causing carriage]7
This has the disadvantage that a seek error occurs during a positioning operation, and a recording/reproducing error occurs during an information recording/reproducing operation on the magnetic disk 11. In addition, the voice coil motor (V CM >
There is also a drawback that electromagnetic noise is generated outside the base plate 12 due to leakage magnetic flux from the base plate 12.

[Problem to be solved by the invention]

The problem to be solved by the present invention is to eliminate the drawbacks of conventional magnetic disk drives as described in -F, to reduce the occurrence of disturbances due to electromagnetic noise from outside the magnetic disk drive, and to improve the performance of magnetic disk drives. An object of the present invention is to provide a highly reliable magnetic disk device that does not emit electromagnetic noise to the outside.

[Means to solve the problem]

The magnetic disk device of the present invention includes a spindle that rotates while holding a plurality of magnetic disks stacked at predetermined intervals;
a magnetic head disposed corresponding to the recording surfaces of the plurality of magnetic disks for magnetically recording and reproducing information; an arm for holding the magnetic head; and a magnetic head for holding the arm for magnetically recording and reproducing information; A magnetic tisf device comprising a carriage for positioning the magnetic head, and a base plate 1- for accommodating the spindle and the carriage, in which a film-like magnetic material is adhered to the inner surface of the base plate 1. It is.

〔Example〕

Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a sectional view showing an embodiment of the present invention.

The embodiment shown in FIG. 1 includes a plurality of magnetic disks 1 stacked on a spindle 6 at predetermined intervals, a magnetic head 4 for magnetically recording and reproducing information on the magnetic disk 1, and a tip portion. includes an arm 5 that holds the magnetic head 4, a carriage 7 that holds the rear end of the arm 5 and performs a positioning operation of the magnetic head 4 with respect to the magnetic disk 1, a spindle 4 containing the magnetic disk 1, and the magnetic head 4. A base plate 2 that seals and accommodates a carriage 7 is provided.

The inner surface of the base plate 2 has a magnetic material 3 with excellent magnetic permeability.
is applied by a coating process, which electromagnetically shields the base plate 2 from electromagnetic noise from outside, and also protects the voice coil motor (VCM) of the drive unit of the carriage 7 housed in the base plate 2.
It also electromagnetically shields the leakage magnetic flux from leaking out of the base plate 2. The magnetic material 3 may be adhered to the inner surface of the base plate by adhering a thin film-like magnetic material instead of being applied by coating.

〔Effect of the invention〕

As explained above, the magnetic disk device of the present invention electromagnetically shields electromagnetic noise from the outside of the magnetic disk device by coating the inner surface of the base plate of the magnetic disk device, and also electromagnetically shields the internal surface of the magnetic disk device. This has the effect of electromagnetically shielding leakage of magnetic flux from the VCM to the outside.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing an embodiment of the present invention, and FIG. 2 is a sectional view showing an example of a conventional magnetic disk device. 1.11...Magnetic disk, 2.12...Base plate, 3...Magnetic material, 4.14...Magnetic head,
5.15...Arm, 6.16...Spindle, 7
17... Carriage.

Claims (1)

[Claims] A spindle that rotates while holding a plurality of magnetic disks stacked at predetermined intervals, and a magnetic head that is disposed corresponding to the recording surface of the plurality of magnetic disks and magnetically records and reproduces information. , a magnetic disk device comprising an arm that holds the magnetic head, a carriage that holds the arm and performs a positioning operation of the magnetic head with respect to the magnetic disk, and a base plate that accommodates the spindle and the carriage, A magnetic disk device characterized in that a film-like magnetic material is adhered to the inner surface of the base plate.