Active external distance measuring system having an optical devi

Details Active external distance measuring system having an optical devi Active external distance measuring system having an optical devi

1990-01-23

1992-02-11

Perkey, W. B.

G03B 1336

Patent

active

050879359

ABSTRACT:
An active, external distance measurement type apparatus for focus adjustment of a photographic lens comprises a light emitting element arranged outside a light beam passing through the photographic lens, a projection lens for projecting light from the light emitting element to an object field, a collection lens arranged in spaced relation to the projection lens by a base line length, and a photosensitive element to which the irregular reflection of the light rays projected by the projection lens onto an object to be phtotgraphed is directed by the collection lens. An optical unit is arranged to refract a portion of each of a projecting light beam and a receiving light beam in a different direction so that parallax is compensated for.

REFERENCES:
patent: 4549802 (1985-10-01), Ohtaka

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