发明授权
US5087935A Active external distance measuring system having an optical device in the light projection and light receiving paths to reduce parallax 失效
有源的外部距离测量系统在光投影和光接收路径中具有光学装置以减小视差

Active external distance measuring system having an optical device in
the light projection and light receiving paths to reduce parallax
摘要:
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.
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