초록 ▼

An autofocus control device to perform lens drive control with moving body tracking control. The autofocus control device includes a defocus amount computation device to determine a defocus amount representing an amount of deviation in the optical axis direction of an image formed by the lens and an

An autofocus control device to perform lens drive control with moving body tracking control. The autofocus control device includes a defocus amount computation device to determine a defocus amount representing an amount of deviation in the optical axis direction of an image formed by the lens and an image forming plane. A drive position computation device computes a position to which the photographic lens is to be driven based upon the defocus amount. A first drive direction computation device and a second drive direction computation device both determine a direction in which the lens is to be driven based upon different information. A field travel speed computation device computes a field travel speed for the subject based upon computed drive positions for the photographic lens. A moving body determination device determines whether the subject is a moving body when the drive directions determined by the first and second drive direction computation devices are the same, and the field travel speed determined by the field travel speed computation device is greater than a predetermined value. When the moving body determination device determines that the subject is a moving body, the photographic lens is driven at a speed computed according to lens drive positions computed by the drive position computation device.

대표청구항 ▼

An autofocus control device to control focusing of a photographic lens on a subject, comprising: a defocus amount computation device to periodically determine a defocus amount of a subject image; a drive position computation device to compute drive target positions to which the photographic lens is

An autofocus control device to control focusing of a photographic lens on a subject, comprising: a defocus amount computation device to periodically determine a defocus amount of a subject image; a drive position computation device to compute drive target positions to which the photographic lens is to be driven corresponding to each periodically determined defocus amount; a first direction computation device to determine respective changes in direction of drive target position between successive computed drive target positions; a field travel speed computation device to compute a field travel speed for the subject based on drive target positions computed by the drive position computation device; a second direction computation device to determine a direction of the computed field travel speed; and a moving body determination device to determine whether the subject is a moving body based on the directions determined by the first direction computation device, the field travel speed determined by the field travel speed computation device, and the direction determined by the second direction computation device.