High-precision voice coil motor

Abstract

The invention discloses a high-precision voice coil motor which comprises a shell, an upper clip, a lower clip, a lens vehicle, a first magnet, a second magnet, a first coil and a second coil. The outer side of the upper clip is fixedly connected with the upper portion of the shell, the inner side of the upper clip is connected with the top of the lens vehicle, the outer side of the lower clip is fixedly connected with the lower portion of the shell, the inner side of the lower clip is connected with the bottom of the lens vehicle, a magnet yoke is arranged between the upper clip and the lower clip, a separation portion is arranged in the middle of the magnet yoke, the first magnet is positioned on the upper side of the separation portion, the second magnet is positioned on the lower side of the separation portion, the first coil and the second coil are fixed onto the lens vehicle, the first coil corresponds to the first magnet, the second coil corresponds to the second magnet, the number of turns of the first coil is larger than the number of turns of the second coil, and independent control circuits are connected with the first coil and the second coil. The high-precision voice coil motor has the advantages that the different coils can be switched over to be powered on according to different requirements of a rough adjustment mode and a fine adjustment mode, quick rough adjustment and accurate fine adjustment can be carried out, and accordingly the efficiency can be improved.

Description

technical field [0001] The patent of the present invention relates to a lens driving device, in particular to a high-precision voice coil motor used in video cameras, cameras or electronic equipment with a camera function. Background technique [0002] At present, due to the advantages of small size, low power consumption and low price, voice coil motors have been widely used as actuators in electronic products, especially in camera modules (such as mobile phone cameras) The device basically uses a voice coil motor. The voice coil motor is a kind of force that uses a permanent magnet to generate force on the energized coil, and makes regular movements to move the lens at a small distance, thereby changing the focal length and achieving the purpose of clear images. Existing voice coil motors control the force of the coil by adjusting the current of the coil. Since the number of turns of the coil is fixed, when the lens is fine-tuned and coarsely adjusted, it cannot be adjust...

AI Technical Summary

Problems solved by technology

Existing voice coil motors control the force of the coil by adjusting the current of the coil. Since the number of turns of the coil is fixed, when the lens is fine-tuned and coarsely adjusted, it cannot be adjusted efficiently as needed.

Images