Voice coil motor starting control method and device and camera module group

Abstract

The embodiment of the invention discloses a voice coil motor starting control method comprising the steps that a voice coil motor driver is controlled to output starting current to a voice coil motor, wherein the starting current is the minimum current for controlling the voice coil motor to drive a lens component to move; and the voice coil motor driver is controlled to output step increasing driving current with the starting current acting as the initial value, the current step change time acting as the step and the current step change value acting as the step to the voice coil motor according to the acquired current step change time and the current step change value until the voice coil motor is controlled to drive the lens component to move to the target position. The embodiment of the invention also discloses a voice coil motor starting control device and a camera module group.

Description

technical field [0001] The invention relates to a voice coil motor startup control technology, in particular to a voice coil motor startup control method and device, and a camera module. Background technique [0002] Voice coil motor (VCM, Voice Coil Motor) has the advantages of high efficiency, simple structure, and small size. Voice coil motors are widely used in mobile phone camera auto-focus modules. The coil motor drives the lens to move to achieve focusing. The voice coil motor has a special driver chip, and the image signal processor (ISP, Image Signal Processor) configures the register of the driver chip according to the autofocus algorithm to achieve focusing; the main working principle of the voice coil motor is: In a permanent magnetic field, the stretching position of the spring piece is controlled by changing the DC current of the inner coil of the motor, thereby driving the lens to move. When the voice coil motor drives the lens to move, affected by the gravity...

AI Technical Summary

Problems solved by technology

[0003] figure 1 is a schematic cross-sectional view of the camera module, figure 2 It is the relationship diagram between the displacement of the lens assembly and the drive current of the voice coil motor when the voice coil motor starts in the prior art, image 3 It is a relationship diagram between lens assembly displacement and time when the voice coil motor is started in the prior art, and the T is the oscillation period of the voice coil motor; in the prior art, when the camera is turned on, the voice coil motor is started instantaneously, as Figure 1 to Figure 3 As shown, when the voice coil motor is started, the lens assembly installed at one end of the voice coil motor will be affected by inertia, gravity and the defects of the voice coil motor itself, and will touch the lens barrel structure of the camera module and make abnormal noises, which will cause Affect the life of the camera module and generate noise

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