Monitoring system and control method thereof

Abstract

The invention provides a monitoring system. The monitoring system comprises a monitoring module, a voice coil motor with a rotator, a measuring module, a computing module and a storing module. The monitoring module generates and sends a first signal to drive the rotator of the voice coil motor to move. The measuring module measures electrical parameters of the voice coil motor and generates and sends a second signal to the computing module. The computing module calculates the real-time position of the rotator according to the second signal, the initial position of the rotator and an electric power coupling coefficient. The storing module stores the real-time position as a new initial position. The monitoring module re-generates and sends the first signal according to a focusing algorithm and the real-time position. The invention also provides a control method of the monitoring system. Compared with the prior art, the monitoring system and the control method thereof have the advantages that technical problems of complex structure and driving of the voice coil motor, high cost and poor user experience in the related technology are solved.

Description

【Technical field】 [0001] The invention relates to the field of camera modules, in particular to a monitoring system for monitoring the position of a mover of a voice coil motor and a control method thereof. 【Background technique】 [0002] The voice coil motor (Voice Coil Motor, VCM) has the characteristics of high frequency response and high precision. Compared with other types of micro motors, when controlling the camera module to achieve auto focus and optical image stabilization in mobile devices such as mobile phones and tablets Absolute advantage. The basic working principle of the voice coil motor is to use the ampere force received by the energized coil in the magnetic field to make the magnet steel and the coil move relative to each other, thereby driving the camera module to move up and down. Combined with the autofocus driver and algorithm, the autofocus of the lens group and other functions can be realized. Based on the above principles, the structure of the voi...

AI Technical Summary

Problems solved by technology

The ensuing problem is that the introduction of the Hall sensor will cause the cost of the motor to increase, the structure will be more complicated, the drive will be more complicated, and it will be more difficult to achieve miniaturization

In addition, the increase in cost did not give consumers enough user experience improvement

Images