초록 ▼

A focus detecting device for detecting the focus adjusted state of an imaging optical system with respect to an object body comprises first and second photoelectric element arrays each including a plurality of photoelectric elements arranged in one direction, a focus detecting optical system for for

A focus detecting device for detecting the focus adjusted state of an imaging optical system with respect to an object body comprises first and second photoelectric element arrays each including a plurality of photoelectric elements arranged in one direction, a focus detecting optical system for forming first and second optical images of the body on or near the first and second arrays by first and second light beams passed through different first and second areas, respectively, of the exit pupil of the imaging optical system, the first array producing a series of first output signals having a distribution pattern associated with the illumination intensity distribution pattern of the first image, the second array producing a series of second output signals having a distribution pattern associated with the illumination intensity distribution pattern of the second image, focus detection means for producing a focus detection signal representative of the focus adjusted state of the imaging optical system, on the basis of the first and second output signals, and vignetting detection means for detecting, on the basis of the first and second output signals, the vignetting influence of the first and second output signals by the vignetting of the first and second images caused by the imaging optical system.

대표청구항 ▼

A focus detecting device for detecting a relationship between a predetermined plane and an image, which is formed by an imaging optical system, of an object to be photographed, said device comprising: a focus detection system provided with first and second photoelectric arrays each including a plura

A focus detecting device for detecting a relationship between a predetermined plane and an image, which is formed by an imaging optical system, of an object to be photographed, said device comprising: a focus detection system provided with first and second photoelectric arrays each including a plurality of photoelectric elements arranged in one direction, a detection optical system for directing a first radiation beam to said first photoelectric array and for directing a second radiation beam to said second photoelectric array and focus detection means, said first radiation beam passing through a first area of an exit pupil of said imaging optical system from said object, said second radiation beam passing through a second area of said exit pupil of said imaging optical system from said object, said second area being different from said first area, said first photoelectric array producing a first electrical signal corresponding to an intensity distribution of incident light on said plurality of photoelectric elements thereof, said second photoelectric array producing a second electrical signal corresponding to an intensity distribution of incident light on said plurality of photoelectric elements thereof, said focus detection means producing a focus detection signal representative of said relationship in response to said first and second electrical signals; and vignetting detection means responsive to said first and second electrical signals for calculating an amount of a vignetting of said first and second light beams which is caused by said imaging optical system.