DISK DRIVE DEVICE AND DISK BLANK MATERIAL FOR DISK DRIVE DEVICE

• Main Authors: IMAGAWA KIMIE, YONEMITSU MAKOTO, KITAWAKI KOTARO, NAKAMURA TADAHIRO, MURATA TAKUYA, NAKAYAMA MASARU
• Format: Patent
• Language: English; Japanese
• Published: 22.11.2018
• Subjects: INFORMATION STORAGE; INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORDCARRIER AND TRANSDUCER; PHYSICS

PROBLEM TO BE SOLVED: To provide a disk drive device capable of effectively suppressing fluttering of a disk during high-speed rotation by optimizing properties in a state of a disk fixed by a clamp member, and a blank material used as a base material for manufacturing the disk.SOLUTION: A disk drive device including a disk-shaped disk having a through hole in its center portion, and a spindle inserted into the through hole of the disk, in which a spindle motor for co-rotating the disk together with the spindle, and a clamp member provided on an upper surface of the disk and fixing an inner diameter side portion of the disk are provided, the clamp member has an annular protrusion on a lower surface of the clamp member opposed to the upper surface of the disk, and a flatness F1 in the upper surface of the disk measured in a clamp fixed state in which the protrusion of the clamp member is pressed into contact with the upper surface of the disk is 10 μm or less.SELECTED DRAWING: Figure 2 【課題】本発明は、クランプ部材で固定されたディスクの状態で性状の適正化を図ることによって、高速回転時のディスクのフラッタリングを有効に抑制できるディスク駆動装置および当該ディスクを作製するための基材として用いられるブランク材を提供する。【解決手段】中央部に貫通孔を有する円盤形状のディスクと、ディスクの貫通孔に挿入されるスピンドルを有し、当該スピンドルと共にディスクを共回転するスピンドルモータと、ディスクの上面に設けられ、ディスクの内径側部分を固定するクランプ部材と、を備え、クランプ部材は、ディスクの上面と対向するクランプ部材の下面に環状の突起部を有し、かつディスクの上面にクランプ部材の突起部を押圧接触させたクランプ固定状態にて測定したディスクの上面における平坦度Ｆ１が、１０μｍ以下であるディスク駆動装置。【選択図】図２