JPH0253877B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a magnetic disk device used in electronic computers, peripheral terminal equipment, and the like.

Conventionally, there has been a device of this type as shown in FIG. In the figure, 1 is a storage disk (magnetic disk) that records information. 2 is a drive motor, and a magnetic disk 1 is fixed to the motor shaft 3.
drive the rotation. Reference numeral 4 denotes a position reading head (servo head) for reading position information from the magnetic disk 1. Reference numeral 5 denotes an information recording/reproducing head (data head) for recording information on the magnetic disk 1 or reproducing information from the magnetic disk 1. A carriage 6 moves the servo head 4 and data head 5 by a drive mechanism (not shown). Reference numeral 7 denotes a base on which the drive motor 2 and other drive mechanisms (not shown) are fixed.

Next, the operation will be explained.

When the magnetic disk 1 is rotated by the drive motor 2, a viscous air flow is generated on the surface of the magnetic disk 1, giving buoyancy to the servo head 4 and the data head 5, and the pressurizing force of the leaf springs of the servo head 4 and the data head 5 is increased. The servo head 4 and the data head 5 float above the surface of the magnetic disk 1 while maintaining a small gap in equilibrium with the magnetic disk 1. When a command is received from the computer, the servo head 4 and the data head 5 read out the position of the magnetic disk 1 via the servo head 4. After the carriage 6 is moved and positioned by a drive mechanism (not shown), information is recorded on or reproduced from the magnetic disk 1 via the data head 5.

Since the conventional magnetic disk device is configured as described above, the leakage magnetic field generated from the magnets and coils (not shown) built into the drive motor 2 and motor shaft 3 (when the current turns on and off) is transmitted to the servo head. 4 and the data head 5 as noise, resulting in positioning errors and errors in recording or reproducing information.

This invention was made in order to eliminate the drawbacks of the conventional ones as described above, and includes a magnetic material in the drive motor and at least in the peripheral part of the memory disk attachment part of the motor shaft (of course, the entire motor shaft is also applicable). It is an object of the present invention to provide a device in which the leakage magnetic field generated from the drive motor and motor shaft can shield the magnetic path from entering the servo head and data head, thereby eliminating the above-mentioned drawbacks of the conventional device. Hereinafter, one embodiment of this invention is shown in FIG.
FIG. 3 will be explained.

In FIGS. 2 and 3, numerals 1 to 7 are the same as in FIG. 1. A motor shield 8 is made of a magnetic material and is provided around the periphery of the drive motor 2 and the motor shaft 3.

Next, the operation will be explained.

Since leakage magnetic fields generated from magnets and coils (not shown) built into the drive motor 2 and motor shaft 3 (when the current turns on and off) are shielded by the motor shield 8, the servo head 4 and data head No. 5 will not be mixed in as noise. Therefore, positioning and information recording or reproduction can be performed correctly. Note that other operations are performed similarly to conventional devices.

In the above embodiment, a magnetic disk device has been described, but it goes without saying that the present invention can be widely applied to other devices such as a recording device and a recording device. Furthermore, although the carriage 6 is driven linearly, it is the same even if it is rotated.

As explained above, in this invention, a magnetic material is provided on the peripheral edge of the storage disk drive motor and at least the storage disk attachment part of the motor shaft, so that the leakage magnetic field from the drive motor to each head is shielded, and the positioning This has the effect of allowing information to be recorded or played back correctly.

[Brief explanation of drawings]

FIG. 1 is a side view showing a conventional magnetic disk device, and FIGS. 2 and 3 are a side view and a plan view of a magnetic disk device showing an embodiment of the present invention. In the figure, 1 is a magnetic disk, 2 is a drive motor, and 3
is a motor shaft, 4 is a servo head, 5 is a data head, and 8 is a motor shield. Note that the same reference numerals in the figures indicate the same or corresponding parts.

Claims (1)

[Claims] 1. A motor shaft to which a storage disk sandwiched between a position reading head and an information recording/reproducing head is attached;
In a magnetic disk device having a drive motor that rotates the storage disk by driving the motor shaft, a shielding member is provided between the drive motor and at least a peripheral portion of the motor shaft where the storage disk is attached. A magnetic disk device characterized by being provided with a magnetic material.