Optical displacement sensor and optical displacement measurement device

摘要

It is an object to provide an optical displacement sensor and an optical displacement measurement device capable of improving the detection accuracy in detecting the presence or absence of a target object. An optical displacement sensor is constituted by a light projection unit for directing projected light to a target object, a light reception unit including plural light reception elements arranged in a linear shape for receiving light reflected by the target object out of the projected light L1 and outputting signals corresponding to the amount of received light, a received-light-spot detection portion for detecting a received-light spot on the light reception unit, on the basis of the outputs of the respective light reception elements, a number-of-spots determination portion for determining the number of received-light spots, on the basis of the result of the detection by the received-light-spot detection portion, a spot-position determination portion for determining a one-dimensional position at which the amount of received light is maximum, within the received-light spot, on the basis of the result of the detection by the received-light-spot detection portion, and an object detection processing portion for outputting detection signals indicative of the presence or absence of the target object, on the basis of the results of the determinations by the number-of-spots determination portion and the spot-position determination portion.