Patent ID: 8281330
Filing Date: 2012-10-02
Classification: G11B

Abstract:
1. A disk apparatus, comprising: a motor for rotationally driving a discoid recording medium; a record-playback unit for recording a digital signal onto and/or playing back a recorded digital signal from the discoid recording medium; a drive chassis on which said motor and said record-playback unit are fastened; elastic members placed in at least three respective predetermined positions of said drive chassis; and a weight plate floatingly and movably supported on said drive chassis by way of said elastic members; wherein the shape of said weight plate is determined based on: a plurality of natural-vibration modes of a vibration-damping mechanism for the drive chassis including the at least three elastic members and the weight plate includes: the shape of said weight plate is determined by making each of individual natural-vibration frequencies attributed to the translational vibration mode and the rotational vibrational mode approximately coincident with the predetermined vibration-damping frequency, the predetermined vibration-damping frequency is set based on a maximum rotational speed of the discoid recording medium; and said elastic members are attached to said weight plate and said chassis, and disposed therebetween, at said predetermined positions.