IMAGE-PICKUP DEVICE, AUTOMATIC FOCUS ADJUSTMENT METHOD, AUTOMATIC FOCUS ADJUSTMENT DEVICE AND STORAGE MEDIUM

摘要

PROBLEM TO BE SOLVED: To protect an auxiliary light-emitting section and to accurately conduct AF control. SOLUTION: This image-pickup device has an automatic focus adjustment device that extracts a prescribed high-frequency component of a video signal obtained from an image-pickup means as a focal evaluation value and moves a focus compensation lens 105 in an optical axis direction for maximizing the focus evaluation value to adjust the focus and a light-emitting means 119 that enhances the illuminance of the object. In the midst of focus adjustment by the automatic focus adjustment device, an auxiliary light-emitting section 121 provided to the light-emitting section 119 is lighted synchronously with a vertical scanning period of the video signal and the lighting time of the auxiliary light- emitting section 121 is selected to be an integral multiple of the vertical scanning period of the video signal so as to improve the durability of the auxiliary light-emitting section 121 and effective light emission is conducted for the vertical scanning period of all the video signals to improve the light-emitting efficiency.