Spindle motor for disk driving device

Abstract

If the motor housing 5 is manufactured with a resin, the housing 5 becomes possible to be manufactured by injection molding, so that the housing 5 can be intended to lower the manufacturing cost by a mass production. Further, the counter measures for insulation such as covering a copper wire 7 with an insulating tape, interposing an insulator to an opening 5a of the housing installing an insulating shim between the coil 6a and the housing 5 become unnecessary. As a result, it becomes possible to expect a cost down of the spindle motor due to the reduction of the cost of the parts for insulating members and the mounting processes. And, further, since a vibration transmitted from the rotor 1 through the bearing and a vibration caused by an electric switching of the stator 6 etc. are diminished due to elastic absorbing function of the housing 5, rotation noise of the spindle motor can be reduced.

Description

[0001] This is a Division of application Ser. No. 09 / 487,803 filed Jan. 20, 2000. The entire disclosure of the prior application is hereby incorporated by reference herein in its entirety.[0002] 1. Field of the Invention[0003] The present invention relates to a spindle motor suitable for a disk driving device for such as hard disk drive, optical disk drive and removal type of disk drive.[0004] 2. Related Art[0005] FIG. 1 is a sectional view of a spindle motor for disk driving device. This spindle motor is used for a so called a removal type of disk drive (ZIP), in which a disk i.e. a recording medium can be replaced upon necessity. And, the spindle motor of FIG. 1 is a so called "shaft rotation type" of spindle motor, in which a shaft 2 is mounted on a rotor 1, the shaft 2 is supported on a housing 5 through a bearing 3.[0006] The rotor 1 comprises a circular disk putting face 1a, around its circumferential end portion, a downwardly depending flange 1b is formed in unitary manner. A...

AI Technical Summary

Benefits of technology

The present invention relates to a spindle motor for a disk driving device, such as a hard disk drive or optical disk drive. The invention aims to increase the rotation precision of the spindle motor to increase the memory capacity per disk, reduce the cost of the housing, and decrease the rotation noise of the spindle motor. The invention proposes a spindle motor with a resin housing that can be obtained through injection molding or super engineering plastic molding. The housing is designed to absorb vibration and deteriorate rotation noise. The invention also includes various embodiments of the spindle motor, such as the shaft rotation type and shaft fixed type. Overall, the invention aims to improve the performance and cost-effectiveness of the spindle motor for disk driving devices.

Problems solved by technology

However, if a rotation deflection of a spindle motor is great, it becomes difficult to trace such track by the head for writing and reading.

However, a housing to be prepared by cutting work is not preferable in view of a cost reduction.

Further, since a surface treatment for corrosion protection is indispensable due to a metal-made, the cost reduction has been made difficult.

Further, although a conventional spindle motor has been developed to increase the rotation precision as a primary target, due to the recent time's demand, it has been mentioned as a problem to be solved to reduce a rotation noise.

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