Spring lamination pair for microminiaturization voice coil motor

Abstract

A spring lamination pair for a microminiature voice coil motor comprises a front and a rear spring laminations, wherein the front and rear spring laminations both comprise a base body which is opened with a central hole on the center, an inner circle moving ring and an outer circle fixing ring are distributed on the same axis from inner to outer along the peripheral radial direction of the central hole, the inner circle moving ring is provided with a clipping position structure, and the outer circle fixing ring is provided with a tortuous spring wire. The invention is characterized in that the rear spring lamination is formed by combining two half of spring laminations whose left and right are separated through a sheet separating insulating groove, and each half spring lamination is respectively connected with positive and negative input ends. The front and rear spring lamination base bodies are all rectangle plane structure, the outer circle fixing ring is provided with at least four interlaced and tortuous spring wires, each tortuous spring wire has same shape, which is evenly and symmetrically distributed between the inner circle moving ring and outer circle fixing ring. The invention is adopted to increase response speed of a moving carrier base, reduce component number and processing procedure of a voice coil motor, save processing material, reduce manufacturing cost and also reduce external dimension of the voice coil motor.

Description

【Technical field】 [0001] The invention relates to the field of voice coil motors, in particular to an ultra-miniature spring leaf pair of voice coil motors that undertakes the auto-focus function in auto-focus camera modules of portable electronic devices such as mobile phones and notebooks. 【Background technique】 [0002] Voice Coil Motor (VCM) is a special linear displacement drive motor, which has the advantages of simple structure, small size, low energy consumption, no noise, high acceleration and fast response, accurate displacement and low price. Voice coil motors are ideal as short-distance linear displacement power units in portable electronics. Currently, autofocus camera modules for mobile phones and notebook computers generally use voice coil motors as the power unit for the displacement of their optical devices. However, the driving / restoring change speed of the voice coil motor is relatively slow compared with the change speed of several milliseconds in portab...

AI Technical Summary

Problems solved by technology

[0006] It is not difficult to see from the above prior art that although the existing voice coil motor can provide the required linear displacement, it still has the following main defects: a) the number of parts required is large, it is difficult to further reduce the space in the structure, and the process implementation The performance is poor, and the actual production quality is difficult to guarantee; b) Since the front and rear springs that make up the spring pair are flat-shaped structures, separate positive and negative input terminals are required to complete the current introduction function, which undoubtedly increases the number of parts ; c) Both the front and rear spring pieces participate in the current circuit, so a separate insulating piece is required to insulate them from the metal shell; d) The positive terminal and the negative terminal are respectively connected to the front spring piece and the rear spring piece by welding , requires a higher welding process to ensure its welding yield; e) Since the existing front and rear springs use a circular base, the winding way of the spring wire is limited by its installation area, which is too monotonous and cramped, so when applying external force When it is used, the required force is small, and it is very easy to be deflected by external force and produce lateral tilt, so that the elasticity is limited and the recovery speed is slow.

[0007] At present, with the continuous and rapid development of modern science and technology, the autofocus camera modules of mobile phones and laptops require smaller and thinner power units, and higher and higher yield requirements for assembly processes. high, but the assembly process cost is lower and lower. The above-mentioned defects of the prior art have largely limited its application in the field of autofocus camera modules for mobile phones and notebook computers.

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