JPS61112916A - Distance measuring apparatus - Google Patents

Abstract

PURPOSE: To calculate a distance up to a body from position deviation amount and displacement amount of a lens, by allowing one of the lenses to be displaced in the vertical direction perpendicular to the optical axis with the optical axis of these two lens held parallel one to the other for realizing correlation of the distribution of illuminating intensities corresponding to the distance range for measurement and obtaining a position deviation amount of these two images.

CONSTITUTION: In case of the longest distance measurement of a distance range P₁ including the infinity, an image on a CCD array 4 by an infinitely distant specimen lens 2 is shifted from the LH side to the No. 1/2 light receiving element. Namely, this corresponds to an arrangement 'a' representing a displacement distance of zero. For distance measurement within a P₂ range, an image on the CCD array 4 by a body in a point Q, by a lens 2 is arranged from the LH side to No. N/2 light-receiving element. Namely, this corresponds to the arrangement of 'b', and when compare with a case of 'a', position of the lens 2 is displaced to the left hand side along the basic axis by a distance d. Here, by correlation of distribution of illumination intensities on the CCD arrays 3, 4, a distance δ at 'b' is obtained, and addition of δand d enables calculation of a distance X from the amount D of deviation of the image 7 from the optical axis 2B.

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