초록

A focus detecting system has a signal processing circuit for processing output signals from photoelectric transducer elements and generating an output representing the focusing state. A circuit is provided to stabilize the output against abrupt changes in focusing condition.

대표청구항 ▼

A system for repeatedly detecting a state of focusing of an imaging optical system and repeatedly generating an output representing the focus state, comprising: (A) image sensing means for repeatedly sensing an image of the object formed by the imaging optical system and generating a signal represen

A system for repeatedly detecting a state of focusing of an imaging optical system and repeatedly generating an output representing the focus state, comprising: (A) image sensing means for repeatedly sensing an image of the object formed by the imaging optical system and generating a signal representing the image of the object in each repetition of the sensing operation of said image sensing means, wherein said image sensing means has signal integrating effects and generates a signal corresponding to the image; (B) focus detecting means for receiving the signal from said image sensing means and detecting a focusing state of the imaging optical system on the object, said focus detecting means generating an output representing the focusing state in each repetition of the sensing operation of said image sensing means; (C) means for stabilizing abrupt changes between the outputs sequentially provided in two consecutive repetitions of the sensing operation of said image sensing means from said focus detecting means; and means for controlling a signal integrating time of said image sensing means, said stabilizing means being responsive to said integrating time controlling means to stabilize the output of said focus detecting means against changes in the signal integrating time of said image sensing means.