Voice coil motor and camera module using same

Abstract

The invention provides a voice coil motor, which comprises a fixed component, a movable component, an elastic element, a rolling element, a first magnetic element and a second magnetic element, wherein the fixed component has a first accommodating space; the movable component is accommodated in the first accommodating space; the elastic element is elastically connected between the movable component and the fixed component; the rolling element can be coupled between the fixed component and the movable component in a rolling manner; the first magnetic element is fixedly arranged on the fixed component; the second magnetic element is fixedly arranged on the movable component and is opposite to the first magnetic element; and the first and second magnetic elements are used for generating interacting magnetic forces, so that the movable component can rotate relative to the fixed component through the rolling of the rolling element. The invention also relates to a camera module using the voice coil motor.

Description

technical field [0001] The invention relates to optical anti-shake technology, in particular to a voice coil motor capable of realizing optical anti-shake and a camera module capable of optical anti-shake. Background technique [0002] The camera module uses the shutter to control the length of time that the light is projected to the image sensor. For example, when the shutter speed is 1 / 2 second, it means that the time for the image sensor to receive light is 1 / 2 second. If within this 1 / 2 second When the same beam of light moves on the image sensor due to shaking, the image sensor will record the movement track of the light, making the captured photo blurred. In order to compensate for the light offset caused by shaking, camera modules using image stabilization systems to prevent shaking began to appear in the 1990s. For details, please refer to the paper "Optical image stabilization for digital cameras" published by Cardani B. et al. in April 2006 in Control Systems Maga...

AI Technical Summary

Problems solved by technology

[0003] With the continuous development of digital camera technology, the body of the camera is often small and light, which is easy to cause hand shake, resulting in blurred images

The following three situations are likely to produce blurred images: 1. When shooting with a long focus, since the long lens will amplify the amplitude of the camera, slight shaking will also cause greater blur, so the impact of hand vibration on the image clarity is greater than that of using wide-angle lens

2. Shooting in low-light environments. In low-light environments such as indoors and at dusk, the camera will adjust the shutter speed slower to increase the amount of light, so hand shake is more likely to occur.

These conditions can cause jitter, making the image blurred

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