Lens driving device

Abstract

The invention discloses a lens driving device which comprises a movable part used for bearing a lens, a fixed part, a driving structure arranged between the movable part and the fixed part and at least two elastic pieces, and the two ends of the elastic pieces are fixedly connected with the fixed part and the movable part respectively. The elastic piece can bend and deform forwards and backwards towards the optical axis of the lens relative to the fixed part, so that when the driving structure drives the movable part to move relative to the fixed part, the elastic piece drives the movable part to quickly switch between a far focus position and a near focus position; and when the driving structure stops driving, the movable part is kept at the current position. The movable part is clamped by the elastic pieces, the movable part has far-focus and near-focus functions through forward and backward bending deformation, the driving structure drives the movable part to move back and forth so that the movable part can be switched between far-focus and near-focus, after focus fixing, the driving structure does not need to be powered on for continuous keeping, and power consumption is reduced.

Description

technical field [0001] The invention relates to the field of cameras, in particular to a lens driving device. Background technique [0002] The structure of the existing camera module mainly includes a voice coil motor and a movable part for carrying the lens, wherein the movable part is supported by shrapnel and suspended in the voice coil motor, so that the movable part can act relative to the voice coil motor The telescopic action realizes the adjustment from far focus to near focus. In this structure, the voice coil motor is used as the driving part, and the thrust force generated by the magnetic field generated by the current-carrying wire and the permanent magnet is used to push the movable part to move. However, when the voice coil motor pushes the movable part to move and locate at the desired focus position, the coil needs to be energized so that the movable part stays at the position, and power consumption continues to be generated. In addition, in this structure...

AI Technical Summary

Problems solved by technology

However, when the voice coil motor pushes the movable part to move and locate at the desired focus position, the coil needs to be energized to keep the movable part at this position, resulting in continuous power consumption

In addition, in this structure, the movable part moves continuously to focus, and the image quality of the focus position has corresponding requirements, so the adjustment of the focus process is complicated

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