High-Sensitivity Actuator with New Magnetic Circuit in Optical Pickup

Abstract

A lens actuator is an important mechanical-electrical component in optical pickup. For the high-sensitivity actuator used in a super-multi recorder, a novel magnetic circuit is proposed in this paper. This magnetic circuit consists of six thick permanent magnets with regulated placement, two thin permanent magnets, a base yoke, and an upper yoke. Experimental results verified the feasibility of the designed magnetic circuit.

Reduction in Rolling Tilt of Objective Lens Actuators for Optical Disc Drives

“…It is necessary for objective lens actuators in highdensity and high-speed optical disc drives to have high driving sensitivity and high frequency of elastic vibration modes of a moving part in the actuators [1][2][3][4], and also to reduce the inclination of the objective lens when it is moved in the direction of focus or tracking [5][6][7][8]. When the resonance frequency of the rolling mode of the moving part is especially close to the rotational frequency of the disc, the rolling tilt amplitude of the objective lens tends to increase.…”

Integrated tracking and focusing micro lens actuators based on silicon bulk micromachining

“…Lens actuator is a basic and indispensable component for optical pickup head to acquire the horizontal and vertical motions of the objective lens which are called tracking and focusing respectively [4].…”