Development of an Objective Lens Actuator for Isolating the Drive Reaction Force Using Half-Phase Bandwidth Methd for Thin-Type Optical Disc Drives

Abstract

A new technique for reducing vibration of an objective lens actuator on a carriage is developed for optical disc drives. Phase disturbance at frequencies of several thousand hertz resulting from drive reaction forces is discussed. A practical method using only phase disturbance for evaluating modal damping in higher modes is proposed. Calculating modal damping in higher modes by this method is feasible for deciding the modal residue ratio and the level of vibration reduction. A simple structure for isolating the vibration of the drive reaction force of the actuator is designed. A new lens actuator which uses this vibration reduction technique has developed. And a thin-type optical disc drive has developed.