AUTOMATIC FOCUSING SYSTEM.

摘要

This invention relates to an automatic focusing system which takes the picture of an inspection object by a camera (5) through an optical system (4), transfers a video signal converted photoelectrically by the camera (5) to a frame memory (9), performs image processing on the signal read out from the frame memory (9) to determine a focusing level evaluation value and controls the position of the optical system in a direction where this focusing level evaluation value approaches a maximum value. The position control operation of the optical system is made within a blanking time between the charge storage times of two sequential images on the camera.