DISK CLAMPING MECHANISM AND INFORMATION RECORDING DEVICE PROVIDED WITH THE MECHANISM

摘要

PROBLEM TO BE SOLVED: To provide a disk clamping mechanism capable of reducing eccentricity even under the worst condition of loading the disk while applying an external force to the disk and also capable of reducing the eccentricity regardlessly of the roundness of a disk center hole even in the exchangeable disk clamping mechanism of a disk driving device. SOLUTION: This mechanism is provided with a turntable 11 for loading and driving a disk having a center hole a cylindrical fixed centering member 12 position-foxed with respect to a rotational center to guide the center hole, and two movable centering members 17 and 18 protruded to be displaced from a part of the fixed centering member in a radial direction. The diameter 2R of the fixed centering member is set to a value as large as possible not exceeding the standard lower limit value of the disk center hole diameter, the center of the fixed centering member is made eccentric by (h) from a rotational center, and the centers of the two movable centering members are disposes in opposing positions via the rotational center with respect to its eccentric direction.