A digital image forming equipment in which image is formed by reflecting and scanning laser light emitted from a source of light onto a photo-sensitive body by means of a polygon mirror driven and rotated by a drive motor, so composed that the rotation of the polygon motor can be started when operating the operating portions installed thereon and can be stopped in the elapse of a specified period of time after the image forming operation is terminated, and a digital image forming equipment so composed that the drive motor can be started by detecting existence of an operator when the operator approaches the image forming equipment and can be stopped in the elapse of a specified period of time after the image forming operation is terminated.