초록

An automatic focusing apparatus for use in a video camera and the like wherein one optical element other than a focusing lens means of an optical system is moved for focusing in the in-focus direction while being vibrated slightly by means of a motor capable of being driven by pulses.

대표청구항 ▼

An automatic focusing apparatus for use in a video camera and the like comprising: an optical system including optical elements comprised of an objective lens means, a variator lens means, a compensator lens means, an image forming lens means and an image sensing device; means for moving and for sli

An automatic focusing apparatus for use in a video camera and the like comprising: an optical system including optical elements comprised of an objective lens means, a variator lens means, a compensator lens means, an image forming lens means and an image sensing device; means for moving and for slightly vibrating on optical element of said variator lens means, compensator lens means, image forming lens means and image sensing device for enabling focusing; means for extracting a high frequency band component containing a slight vibration component indicative of the slight vibration from an image signal produced from said image sensing device; and a feedback control system for controlling said moving means to control the position of said one optical element of the basis of said slight vibration component in said high frequency band component, so that the maximum of the high frequency band component from said extracting means is obtained.