Patent ID: 6088536
Filing Date: 2000-07-11
Classification: G02B

Abstract:
A distance measuring apparatus in a lens-shutter type camera provided with a photographic lens, a focal length of said photographic lens being variable, said distance measuring device comprising:a distance measuring unit fixed to a camera body of said camera, said distance measuring unit comprising a pair of image forming lenses, each image forming lens forming a subject image, and a pair of line sensors on which said subject images are respectively formed through said pair of image forming lenses, each line sensor having a plurality of light receiving elements, each light receiving element converting received light into an electrical signal when actuated, wherein optical axes of said pair of image forming lenses are spaced from an optical axis of said photographic lens;a storage device that stores predetermined correction data corresponding to an amount of parallax occurring between said optical axes of said pair of image forming lenses and said optical axis of said photographic lens;a selector that selects a group of light receiving elements from said plurality of light receiving elements in accordance with said predetermined correction data, wherein only light receiving elements of said selected group are actuated to each generate said electrical signal; anda calculator that calculates a subject distance value, using subject image data formed by said electrical signals generated through said light receiving elements of said selected group.