| 摘要 |
In an automatic focus control apparatus for a video camera including an image pick-up element for picking up an optical image obtained through a lens system composed of a focus lens group, a zoom lens group, a focal position correction lens group and a relay lens group and a defocus detector for detecting a defocus signal corresponding to a defocus of the lens system from an image signal output from the image pickup element, a piezoelectric actuator is provided to move the image pick-up element in an optical-axis direction in accordance with the defocus signal and a motion transmission mechanism connects the image pick-up element to the relay lens group of the lens system to allow that lens group to be moved in a direction opposite to that in which the image pick-up element is moved. A stroke burden which is borne by the piezoelectric actuator can be alleviated by moving the relay lens group together with the image pick-up element.
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