초록 ▼

Focus detecting apparatus for an optical system including first and second image forming optical means for forming the image of an object along first and second spatially separated light paths, first and second photosensitive element arrays each comprising a plurality of photosensitive elements and

Focus detecting apparatus for an optical system including first and second image forming optical means for forming the image of an object along first and second spatially separated light paths, first and second photosensitive element arrays each comprising a plurality of photosensitive elements and producing an electrical signal representative of the intensity distribution pattern of the light incident thereon, and circuit means for detecting the focus of the optical system in accordance with the electrical signals from the first and second arrays. The circuit means includes a first processing circuit, a second processing circuit and a phase comparing circuit. The first processing circuit produces an electrical output having a phase representative of the positional relation between the first array and the intensity distribution pattern of the light incident on the first array, in accordance with the electrical signal from the first array. The second processing circuit produces an electrical signal having a phase representative of the positional relation between the second array and the intensity distribution pattern of the light incident on the second array, in accordance with the electrical signal from the second array, and the phase comparing circuit compares the phases of the electrical outputs from the first and second processing circuits and produces an output signal representative of the focus position of the optical system.

대표청구항 ▼

In a focus detecting apparatus for an optical system including: first and second image forming optical means for receiving light from an object along first and second spatially separated light paths and forming the image of said object; first and second photosensitive element arrays disposed in pred

In a focus detecting apparatus for an optical system including: first and second image forming optical means for receiving light from an object along first and second spatially separated light paths and forming the image of said object; first and second photosensitive element arrays disposed in predetermined image planes of said first and second image forming optical means, each of said arrays comprising a plurality of photosensitive elements, and said arrays producing electrical signals representative of the intensity distribution pattern of the light incident thereon, at least one of which varies with the focus of the optical system; and circuit means for detecting the focus of said optical system in accordance with the electrical signals from said first and second arrays; the improvement residing in that said circuit means includes a first processing circuit for producing an electrical output having a phase representative of the positional relation between said first array and the intensity distribution pattern of the light incident on said first array, in accordance with the electrical signal from said first array, a second processing circuit for producing an electrical output having a phase representative of the positional relation between said second array and the intensity distribution pattern of the light incident on said second array, in accordance with the electrical signal from said second array, and a phase comparing circuit for comparing the phases of the electrical outputs from said first and second processing circuits and producing an output signal representative of the focus position of said optical system.