Automatic focusing device based on consumption type voice coil motor

The utility model discloses an automatic focusing device based on a consumption type voice coil motor, which is used for automatic focusing operation of fundus imaging equipment and comprises a motorbody and a lever driven by the motor body. The motor body is a voice coil motor, a balancing weight is arranged at one end of the lever, an image sensor is arranged at the other end of the lever, thebalancing weight is located at the end, close to the motor body, of the lever, and the image sensor is located at the end, away from the motor body, of the lever. The distance between the image sensorand the rotation center of the lever is larger than the distance between the balancing weight and the rotation center of the lever. According to the voice coil motor, under the matching effect of themotor body and the lever, the load amplifying lever is adopted, the load capacity of the voice coil motor can be greatly improved, the stroke of the voice coil motor can be greatly improved through the stroke amplifying lever,