Motor having chucking device and disk driving apparatus including the same

Abstract

A motor includes a chucking device for detachably holding a disk-shaped storage medium. The chucking device includes a plurality of radially outwardly biased claw members. Further, the claw members make contact with a top surface of a cover portion of a turntable when the claw members are in contact with the top edge of a central opening of the storage medium. At least one of the claw member's contact sections and the turntable's contact section is made of a material different than a material forming the remaining sections of the claw members and the remaining section of the turntable so that the static friction coefficient between the claw member's contact sections and the turntable's contact section becomes greater than the static friction coefficient between the claw members and the rest portions.

Description

technical field [0001] The present invention relates to a motor provided with a clamping device for attaching and detaching a disk-shaped storage medium (hereinafter simply referred to as "disk"), the motor having A structure that makes it difficult to remove the disc when in place. Background technique [0002] In recent years, a chucking device is used in a spindle motor for rotating a disk mounted on a disk drive apparatus about a designated center axis. The clamping device is typically of the type in which the disc is held in place by a plurality of jaw members provided in the clamping device. In this type of clamping device, it is necessary to use a structure that makes the disk easy to attach but difficult to detach. [0003] Referring to Fig. 15, a conventional clamping device will be described. FIG. 15 shows a schematic sectional view in axial direction of a conventional clamping device on which a disc KD is mounted. [0004] Referring to FIG. 15, the clamping de...

AI Technical Summary

Problems solved by technology

In this regard, if the detachment force is increased by making the reaction force against the radially inward compression of the elastic member 4 larger, the force required to attach the disk KD (hereinafter referred to as "attachment force") will also be increased thereby. , which cannot meet the needs of disk drive devices

During this period, development of a structure for increasing the frictional force generated by the contact between the claw member 3 and the turntable 5, that is, increasing the detaching force of the disc without increasing the attaching force of the disc was not carried out.

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