光ディスク装置のディスク・スピンドル・軸受系の軸方向振動

概要

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Characteristics of axial vibration of an optical disk-spindle-bearing system are experimentally and partially theoretically investigated using a focusing error signal. The measured error signal is separated into two components, averaged component (RRO) and variable component (NRRO). The main frequency of RRO is six times of spindle rotational speed due to an irregularity of the six motor driving coils, while those of NRRO are rotational speeds of the inner, outer race and retainer of ball bearings. The error signal increases when these excitation frequencies approach natural frequencies of the disk bending vibration and the axial vibration of the spindle. Furthermore, methods for estimating both the disk bending natural frequenchies and axial stiffness of the ball bearings are proposed. The stiffness is strongly dependent on a preloading process and is affected by preload, additional axial force due to the motor rotor magnet, and bearing clearance.
一般社団法人日本機械学会の論文
1996-12-25