Voice coil motor device

Abstract

This invention relates to a voice coil motor device driven by automatic focusing or zoom lens set used in microcameras including a voice coil motor, multiple guiding steel shafts, a load mounting slide and a base, in which, said voice coil motor includes a magnetic path part composed of a magnet and a yoke and a circuit part composed of coils, said magnetic path part is rigidly connected with theload mounting slide as the moving part of the device, said circuit part and the guiding steel shaft are fixed on the base as the non-moving part characterizing that the free beat resulted in the clearance between the moving and non-moving parts is eliminated by the leakage field of the motor magnetic path and a pre-mgnetic force generated by the guiding steel shaft interlinkage to reach the movement performance of high repeatability, besides, the magent and the yoke form a magnetic path structure of non-circle with a rectangular exterior.

Description

Voice coil motor device technical field The present invention refers to a miniaturized voice coil motor device with magnetic pre-pressure precision guidance, in particular to a voice coil motor device that can be applied to driving a miniature camera lens group. Background technique The existing cylindrical voice coil motor, as shown in Figure 5, includes a concentric ring yoke 51 with a U-shaped section, and several sections of arc-shaped magnets 52 are attached to the inner surface of the concentric ring yoke with a U-shaped section to form a To close the magnetic field, a coil 53 is placed in the air gap 54 formed by the magnet 52 and the yoke 51. When the coil 53 is supplied with a current, the current will interact with the magnetic field in the air gap 54 to generate thrust. In order to keep the coil 53 in an even gap with the magnet 52 and the yoke 51 in the air gap, there are several clamping and guiding methods, one of which is to use a precision sleeve sliding sh...

AI Technical Summary

Problems solved by technology

The main purpose of the present invention is to propose a low-cost miniaturized voice coil motor device with a magnetic preload type non-free deflection guide mechanism, so as to improve the shortcomings caused by the existing voice coil motor when it is applied to the drive of the miniature camera lens group and bottleneck

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