초록 ▼

A focus detecting apparatus including an optical system having a group of focusing lenses, an object distance measuring device which measures the amount of defocus for a specific object imaged by the focusing optical system, a focus judging device which judges the focus state in accordance with the

A focus detecting apparatus including an optical system having a group of focusing lenses, an object distance measuring device which measures the amount of defocus for a specific object imaged by the focusing optical system, a focus judging device which judges the focus state in accordance with the measurement of the object distance measuring device and a lens driver for driving the focusing lens group to a focal position, in accordance with the amount of defocus, wherein the apparatus includes a controller for repeatedly operating the object distance measuring device and the lens driver, and a moving object judging device for judging that the specific object is a moving object when the focus judging device judges the out-of-focus state more than one time during the repeated operations.

대표청구항 ▼

An automatic focusing apparatus that includes an optical system having a group of focusing lenses, means for measuring a defocus amount, and means for driving said focusing lens group, comprising: means for calculating a displacement of said focusing lens group, including a direction and amount of m

An automatic focusing apparatus that includes an optical system having a group of focusing lenses, means for measuring a defocus amount, and means for driving said focusing lens group, comprising: means for calculating a displacement of said focusing lens group, including a direction and amount of movement thereof, in accordance with said defocus amount measured by said defocus amount measuring means; and a controller that drives said lens driving means in accordance with said displacement calculated by said lens displacement calculating means and for controlling a displacement necessary to compensate for a backlash, independently of a drive based on said defocus amount when said direction of movement of said focusing lens group changes, wherein said controller drives said lens driving means by said displacement corresponding to said backlash at a high speed and a low speed when said displacement based on said defocus amount is above and below a predetermined value, respectively.