| 摘要 |
A rangefinder for detecting a distance of an object from the rangefinder by employing a triangular measuring system has a radiation emitter to emit infrared radiation towards the object; a position detector having a close-range detecting reglon and a remote-range detecting region, which are separate and independent of each other; a close-range converging lens for focusing the radiation reflected by the object on the close-range detecting region, when the distance of the object from the rangefinder is smaller than a predetermined distance; and a remote-range converging lens for focusing the radiation reflected by the object on the remote-range detecting region, when the distance of the object from the rangefinder is greater than a predetermined distance.
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