초록 ▼

In an automatic focus control device of a camera there are provided defocus amount calculation means for calculating a defocus amount for a predetermined focus plane of a photographic lens in the camera on the basis of the electric signal generated by a light receiving means, comparing means for com

In an automatic focus control device of a camera there are provided defocus amount calculation means for calculating a defocus amount for a predetermined focus plane of a photographic lens in the camera on the basis of the electric signal generated by a light receiving means, comparing means for comparing the obtained value on the basis of the calculated defocus amount with a reference value, control means controlling driving speed of the photographic lens by the lens driving means in response to the comparison result of a comparing means, photographic condition setting means for setting the photographic condition and reference value setting means for setting said reference value in response to the set photographic condition.

대표청구항 ▼

In an automatic focus control device for controlling the motion of a lens system to focus an image of an object, the improvement comprising: means for determining the focus condition of the lens system; means for determining the rate at which an object is moving towards or away from the automatic fo

In an automatic focus control device for controlling the motion of a lens system to focus an image of an object, the improvement comprising: means for determining the focus condition of the lens system; means for determining the rate at which an object is moving towards or away from the automatic focus control device, and means for driving the lens system in response to both the determined focus condition and the determined rate of movement of the object to continuously keep the object in focus, whereby an in-focus condition of a moving object can be achieved.