초록 ▼

An automatic focal point control apparatus for optical equipment such as cameras can properly respond to different objects and changes in objects, thus providing stable operation. In the apparatus, defocus signals are calculated according to object image data concerning an object to be photographed,

An automatic focal point control apparatus for optical equipment such as cameras can properly respond to different objects and changes in objects, thus providing stable operation. In the apparatus, defocus signals are calculated according to object image data concerning an object to be photographed, information effective for focal point calculation is extracted from the object image data, and the defocus signals are weighted and averaged by weighting coefficients corresponding to the effective information signals, thereby obtaining a statistical defocus signal.

대표청구항 ▼

An apparatus for causing a focusing optical system to form an object image on a predetermined surface, including: (a) means for detecting a light intensity distribution of light from an object on the predetermined surface and sequentially producing object image data; (b) defocus signal producing mea

An apparatus for causing a focusing optical system to form an object image on a predetermined surface, including: (a) means for detecting a light intensity distribution of light from an object on the predetermined surface and sequentially producing object image data; (b) defocus signal producing means responsive to said object image data for time-serially producing defocus signals representing a positional relationship between said predetermined surface and said object image; (c) contrast detecting means responsive to said object image data for time-serially producing contrast information signals each of which represents a value conforming to a contrast of said object image, the value of each of said contrast information signals decreasing in response to a decrement of the contrast of said object image; (d) calculating means responsive to said defocus signal producing means and said contrast detecting means for calculating a weighted average of a plurality of said defocus signals by using a corresponding number of said contrast information signals as weighting coefficients with respect said weighted average and thereafter producing a weighted average defocus signal conforming to the calculated weighted average, each of said plurality of said defocus signals corresponding, respectively, to each of said corresponding number of said contrast information signals; and (e) driving means for driving said focusing optical system in response to said weighted average defocus signal .