초록 ▼

This specification discloses a focus detecting apparatus having an optical system for forming a plurality of object images on the basis of object lights passed through different pupil areas of an objective lens, and a sensor for putting out a plurality of data signals for the respective object image

This specification discloses a focus detecting apparatus having an optical system for forming a plurality of object images on the basis of object lights passed through different pupil areas of an objective lens, and a sensor for putting out a plurality of data signals for the respective object images, wherein the amount of relative deviation of the object images is detected by a predetermined operation based on the data signal to thereby discriminate the focus state of the objective lens and wherein in the data signals put out from the sensor, the number of the data signals used for an operation is varied in accordance with the focus state or other condition of the objective lens.

대표청구항 ▼

A focus detecting apparatus including: (a) optical means; (b) sensing means for sensing radiation distribution for forming an image formed by said optical means, said radiation distribution being formed from two image rays separated through different exit pupils of said optical means, and said sensi

A focus detecting apparatus including: (a) optical means; (b) sensing means for sensing radiation distribution for forming an image formed by said optical means, said radiation distribution being formed from two image rays separated through different exit pupils of said optical means, and said sensing means comprising a first photosensitive array which forms electric signals corresponding to a radiation distribution formed by one of said image rays, and a second photo-sensitive array which forms electric signals corresponding to a radiation distribution formed by the other image ray; and (c) discriminating means for effecting a detection operation of the focus state of said optical means, said discriminating means having: (i) a first mode in which said discriminating means selects a smaller number of signals than the number of elements forming said first and second arrays, to detect the focus state on the basis of the selected signals from each array when the amount of defocus is over a predetermined value, said selected signals being output from elements from each of said first and second arrays; and (ii) a second mode in which said discriminating means detects the focus state on the basis of the signals output from all the elements in said first and second arrays.