Hard disk drive device

Abstract

The object of the present invention is to provide a hard disk drive device having a bearing means of larger size and sufficient strength, improved impact resistance, high accuracy of rotation, and high reliability. In accordance with the present invention, a hard disk drive device comprising a motor including; a rotor or hub having around outer periphery thereof a downwardly depending flange, said hub is journalled rotatablly on a base by means of a bearing means, said hub is provided with a magnet on the inner peripheral surface of the downwardly depending flange; and, a stator provided on the base so as to opposed face to face with said magnet, said stator includes coils: and, a magnetic disk or disks having a central aperture to be fitted around the outer peripheral surface of the flange provided around the hub of the motor, said magnetic disk is adapted to be rotated by means of said motor: wherein the inner diameter of the downwardly depending flange of said hub of the motor is enlarged, so that the outer and inner diameters of the magnet confined within the downwardly depending flange, and the outer and inner diameters of the stator are also enlarged to allow the outer diameter of the bearing means to be enlarged.

Description

[0001] 1. Technical Field[0002] The present invention relates to an improvement of the hard disk drive device employed for example in computers for storing datum magnetically.[0003] 2. Description of the Prior Art[0004] A hard disk drive device includes a magnetic desk or disks for storing magnetic datum mounted on a hub, i.e. the rotational member of a motor. In order to write the desired magnetic datum into a sector on the magnetic disk or to read the datum therefrom, the disk or disks are rotated in high speed by means of the motor.[0005] In recent years, it is desired to provide a smaller, thinner, and lighter weight, as well as impact resistant magnetic storage means, especially a hard disk drive device.[0006] When impact is applied to the hard disk drive means, the impact energy is apt to concentrated to the bearing means journalling the rotor or hub of the motor for driving the magnetic disk, so that the bearing means is the element is that most liable to be damaged.[0007] Wh...

AI Technical Summary

Problems solved by technology

When impact is applied to the hard disk drive means, the impact energy is apt to concentrated to the bearing means journalling the rotor or hub of the motor for driving the magnetic disk, so that the bearing means is the element is that most liable to be damaged.

When the bearing means is damaged, the accuracy of the rotation of the magnetic disk will be suffered, and the reading and writing of the magnetic datum can not be accomplished accurately, and noise and vibration are produced.

However, a magnetic disk having a central aperture of a diameter larger than that defined under the predetermined standard and a hard disk drive means including a motor larger in the outer diameter of its hub for driving such disk leave not been realized.

Although the countermeasure that reducing the radial thickness of said magnet and / or the radial length of the stator to provide a space required for enlarging the bearing means can be taken, this will suffer the function of the motor such as the rotational torque or the rotational speed.

Images