Continuous Zooming Imaging System Driven By Stepping Motors

In order to meet the volume and weight requirements of the unmanned aerial vehide's( UAV) photoelectric payload, and effectively solve the problem of the high requirement of processing precision of traditional cam mechanism, and the problem that the system is prone to mechanical oscillation and improve the response speed and zoom accuracy of the system, a continuous zooming imaging system based on stepping motor drive is studied. The zoom focus function of the mechanically compensated zoom system is realized by a two-phase hybrid stepping motor drive. First of all, the working principle and composition of continuous zooming imaging system based on stepping motor are investigated. The hardware platform is built, and the acceleration and deceleration process of stepping motor is controlled by single-chip. Then, the image sharpness evaluation function suitable for the system is constructed, and the scan focus search algorithm is used to complete the calibration of the focal length value of the lens, and the calibration result is loaded into the focus algorithm. Finally, the performance test of the system is performed. The test results show that by using the velocity control model, the relative error of the stepping motor displacement decreased significantly, which is below 0. 010 mm, and the zooming accuracy of the whole system is far less than 1%, and the optical performance and field shooting performance are improved. The continuous zooming imaging system based on the stepping motor satisfies the applicability requirements of the photoelectric load of the UAV.