Device for detecting the focus adjusted state of an objecting lens

Claim 1

A focus detecting device comprising: a plurality of secondary imaging optical systems each forming a pair of light distributions whose relative positions vary in conformity with the focus adjusted state of an objective lens with respect to an object image, the secondary imaging optical systems being disposed so that a direction in which the relative positions of one of said pair of light distributions varies is different from a direction in which the relative positions of another of said pair of light distributions varies; an objective lens having a pupil through which pass the pairs of light distributions; and a plurality of focus detecting sensors for receiving the pairs of light distributions, wherein said plurality of optical systems are disposed so that a first optical spacing between areas of said pupil through which the light distributions of said one pair pass differs from a second optical spacing between areas of said pupil through which the light distributions of said another pair pass, each optical system comprising a pair of lenses.

Claim 7

A device for detecting the focus adjusted state of an objective lens having a pupil, comprising: first secondary imaging optical means, having an optical axis, for forming a pair of light distributions whose relative position varies in conformity with the focus adjusted state of said objective lens, said first secondary imaging optical means comprising a pair of lenses; second secondary imaging optical means, having an optical axis, for forming a second pair of light distributions whose relative position varies in conformity with the focus adjusted state of said objective lens in a direction differing from the direction in which the relative position of said first pair of light distribution varies, said second secondary imaging optical means comprising a pair of lenses; sensing means having a first plurality of sensing elements for receiving said first pair of light distributions and a second plurality of sensing elements for receiving said second pair of light distributions; processing means for processing the output of said sensing means and forming a signal indicative of the focus adjusted state of said object lens; and light beam regulating means having apertures defining (1) a first pair of areas in which light beams forming said first pair of light distributions pass through the pupil of said objective lens, and (2) a second pair of areas in which light beams forming said second pair of light distributions pass through the pupil of said objective lens, for regulating said light beams, a spacing between said first pair of areas being smaller than a spacing between said second pair of areas.

Claim 8

A device for detecting the focus adjusted state of an objective lens having a pupil, comprising: first secondary imaging optical means, having an optical axis, for forming a pair of light distributions whose relative position varies in conformity with the focus adjusted state of said objective lens, said first secondary imaging optical means comprising a pair of lenses; second secondary imaging optical means, having an optical axis, for forming a second pair of light distributions whose relative position varies in conformity with the focus adjusted state of said objective lens in a direction differing from the direction in which the relative position of said first pair of light distribution varies, said second secondary imaging optical means comprising a pair of lenses; sensing means having a first plurality of sensing elements for receiving said first pair of light distributions and a second plurality of sensing elements for receiving said second pair of light distributions; processing means for processing the output of said sensing means and forming a signal indicative of the focus adjusted state of said object lens; and light beam regulating means having apertures defining (1) a first pair of areas in which light beams forming said first pair of light distributions pass through the pupil of said objective lens, and (2) a second pair of areas in which light beams forming said second pair of light distributions pass through the pupil of said objective lens, for regulating said light beams, a spacing between said first pair of areas being smaller than a spacing between said second pair of areas.

Claim 12

A device for detecting the focus adjusted state of an objective lens having a pupil, comprising: optical means for forming a plurality of light distributions whose relative position varies in conformity with the focus adjusted state of said objective lens, said optical means having an optical axis, said optical means comprising first and second optical systems each having a pair of lenses, a spacing between the first pair of lenses being different than a spacing between the second pair of lenses; sensing means for sensing said light distributions being displaced toward the optical axis from a predetermined imaging surface of said optical means, and providing an output corresponding to the sensed displacement; processing means for processing the output of said sensing means and forming a signal indicative of the focus adjusted state of said objective lens; a stop having openings defining areas in said objective lens pupil through which said light distributions pass; and adjusting means for moving said stop in a direction perpendicular to the optical axis of said optical means to thereby adjust the position thereof.

Claim 13

A device for detecting the focus adjusted state of an objective lens having a pupil, comprising: optical means for forming a plurality of light distributions whose relative position varies in conformity with the focus adjusted state of said objective lens, said optical means having an optical axis, said optical means comprising first and second optical systems each having a pair of lenses, a spacing between the first pair of lenses being different than a spacing between the second pair of lenses; sensing means for sensing said light distributions being displaced toward the optical axis from a predetermined imaging surface of said optical means, and providing an output corresponding to the sensed displacement; processing means for processing the output of said sensing means and forming a signal indicative of the focus adjusted state of said objective lens; a stop having openings defining areas in said objective lens pupil through which said light distributions pass; and adjusting means for moving said stop in a direction perpendicular to the optical axis of said optical means to thereby adjust the position thereof.