Highly sensitive actuator for optical reading head

Abstract

The invention provides a high-fidelity motivator of optical reading head, which changes the magnetic arrangement of first permanent magnet and second permanent magnet of the high-fidelity motivator to provide the diverse magnetic direction of the out part and the center part of the motivator repeating coil so as to generate the electromagnetic induction force to achieve the high-fidelity.

Description

technical field [0001] The invention provides a high-sensitivity actuator for an optical pickup head, in particular a method of changing the arrangement of permanent magnet sectors to reduce the current and the number of coils required for the tracking coil of the actuator to drive the optical objective lens to track , so as to achieve an actuator that improves the sensitivity and energy efficiency of the optical pickup head. Background technique [0002] In the modern information society, optical discs, which are small in size, light in weight, high in storage density and low in cost, have become one of the most popular non-volatile storage media. In order to access the high-density optical data on the optical disc more quickly and correctly, how to improve the performance of the optical disc access device (such as optical drive and optical disc player) to make the operation of the optical disc access device more efficient, that is, Become one of the key points of research...

AI Technical Summary

Problems solved by technology

But this increased number of coils not only increases the weight of the tracking coil, but also increases the weight of the optical objective lens group 12, and increases the distance between the optical objective lens group 12 and the permanent magnet (to accommodate more coils), so that the focusing coil and the permanent magnet Increased distance of permanent magnets

This increased distance relatively reduces the effective magnetic force of the permanent magnet, so that the focusing coil must use a larger current or more coils to achieve fast focusing, which requires additional resources.

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