Electric collimators are mostly used in fluoroscopy, which is convenient for remote control, and is an indispensable component for remote control gastrointestinal beds. The opening and closing of the lead leaf of the electric collimator is generally driven by a micro DC motor, and the forward rotation, reverse rotation and running time of the DC motor can be properly controlled to adjust the irradiation field to the required size. The adjustment of the irradiation field of the electric collimator is carried out on the electric collimator, and also controlled on the console beside the bed. In addition to continuous adjustment, the latter also has a variety of fixed-size irradiation fields. Buttons, as long as these buttons are pressed, the motor will drive the lead leaf to move to the selected irradiation field and then be fixed to meet the specific requirements of photography. Because the input screen of the image intensifier is circular, the structure of the wire-shielding lead leaf generally adopts the leaf type, which can continuously change the diameter of the irradiation field under the operation of the motor.