Radiant energy – Ionic separation or analysis – Static field-type ion path-bending selecting means
Patent
1992-01-16
1993-10-19
Perkey, W. B.
Radiant energy
Ionic separation or analysis
Static field-type ion path-bending selecting means
2502016, G03B 1336, G01J 120
Patent
active
052550451
ABSTRACT:
In a camera distance measuring apparatus a light projector projects light along a plurality of axes, a first distance detector receiving light of one axis reflected light from an object detecting the distance of an object in the center of the picture, a second distance detector receiving light of another axis reflected from the object and detecting the distance to the object on the periphery of the picture, a moving speed detector receiving light of one axis reflected from the object and detecting the speed of the object in the optical axial direction, a judging device judging whether object distance in the central part of the picture is farther than a predetermined value, an object distance detector operating the second distance detector when the distance to the object in the picture central part is greater than the predetermined value and determining the distance to the object based on the measurements of the first and second distance detectors, an object distance presuming control operating the moving speed detector when the distance to the object in the picture central part is less than the predetermined value and presuming the object distance after a predetermined time based on the detected speed the measured distance and a predetermined time interval and a focusing control adjusting the photographing lens according to object distance determined by the object distance determining means on the basis of the judged result of the judging means or the distance to the object presumed by the object distance presuming means.
REFERENCES:
patent: 4575237 (1986-03-01), Suzuki
patent: 4764786 (1988-08-01), Tamura et al.
patent: 4959678 (1990-09-01), Nakagawa
Olympus Optical Co,. Ltd.
Perkey W. B.
Weinstein Louis
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