Radiant energy – Ionic separation or analysis – Static field-type ion path-bending selecting means
Patent
1980-08-08
1981-09-08
Adams, Russell E.
Radiant energy
Ionic separation or analysis
Static field-type ion path-bending selecting means
354163, 354195, 250201, G03B 708, G01J 120
Patent
active
042881528
ABSTRACT:
An automatic range finder system for use, for example, in an automatic focusing camera or the like which includes a light beam projection unit, a light receiving unit employing a plurality of photoelectric or photosensitive elements, current output circuitry for developing current corresponding to the light beam incident upon one or the plurality of the photoelectric elements, current-voltage conversion circuitry for converting the current outputs into voltage signals, voltage comparison circuitry for comparing the magnitude of the output voltage of the current-voltage conversion circuitry with comparison reference signals. For the comparison reference voltage of the voltage comparison circuitry, voltage varying according to the voltage signal which contains the largest amount of the light beam component is employed, while the output of the voltage comparison circuitry is utilized for focusing of a photographic lens as a distance information.
REFERENCES:
patent: 3443502 (1969-05-01), Harvey
patent: 3723003 (1973-03-01), Vockennuber et al.
patent: 3759614 (1973-09-01), Harvey
patent: 4065778 (1977-12-01), Harvey
patent: 4206990 (1980-06-01), Imura et al.
patent: 4251144 (1981-02-01), Matsuda et al.
Adams Russell E.
Minolta Camera Kabushiki Kaisha
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