Importance

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Abstract

The present invention is intended to provide an optical range finder that is simple in structure and is easy to manufacture. The optical range finder includes a light emitter for emitting a measurement light, an aligning objective lens system for aligning the measurement light emitted from said light emitter, a receiving objective lens system for receiving and converging the reflected measurement light, a light receiver for receiving the reflected measurement light passing through the receiving objective lens system and outputting a corresponding electrical signal, and a controlling and analyzing circuit for controlling, analyzing and processing the electrical signal so as to determine the measured distance. The receiving objective lens system further includes a first optical portion for receiving the reflected measurement light of a long-distance measured object and converging and projecting it onto the light receiving surface of the light receiver, and a second optical portion for receiving the reflected measurement light of a short-distance measured object and converging and projecting it onto the light receiving surface of said light receiver. The receiving objective lens system is divided into a first and a second optical portions for receiving the long-distance and short-distance reflected measurement light, respectively, so as to avoid moving the light receiving surface or adding other optical deflecting element in the receiving light path, simplify the internal structure of the optical range finder, reduce the difficulty in manufacture, and more help to obtain a large scale yield.

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First Claim