1981-12-18
1984-04-24
Gellner, Michael L.
G03B 300
Patent
active
044444770
ABSTRACT:
Disclosed is a zonal range finding apparatus for determining whether an object is located within a first range of distances from the apparatus or a second range of distances from the apparatus. The apparatus includes a radiation projecting device for projecting a beam of radiation toward an object, and a radiation receiving device for receiving radiation by the object. The receiving device is disposed at a distance of a predetermined base line length from the projecting device and having a radiation sensor which produces an electrical output corresponding to the received radiation. Further, a circuit determines, on a basis of the sensor output, whether the object is located within the first or second range. Also disclosed is an automatic focus adjusting device of an image forming optical system which uses an operation member which is manually displaced up to a position at which the member is displaceable in accordance with the distance signal from a distance measuring device with the member provided at the lens barrel of a camera.
REFERENCES:
patent: 3443502 (1969-05-01), Harvey
patent: 3512888 (1970-05-01), Humphrey
patent: 3736057 (1973-05-01), Harvey
patent: 4065778 (1977-12-01), Harvey
patent: 4274735 (1981-06-01), Tamura et al.
patent: 4351590 (1982-09-01), Hirata et al.
Canon Kabushiki Kaisha
Gellner Michael L.
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