PHOTOELECTRIC SENSOR AND METHOD FOR ADJUSTING SENSITIVITY OF PHOTOELECTRIC SENSOR

摘要

PROBLEM TO BE SOLVED: To provide a photoelectric sensor in which a reference value and a hysteresis width of a comparison operating means (comparator function) can be adjusted automatically corresponding to the gain adjustment of a light receiving means and high resolution is realized. SOLUTION: This photoelectric sensor is constituted of a light receiving means 2, a light projecting means 3 and a judging means 4. The light receiving means 2 is equipped with a gain adjusting means 7 for adjusting the gain of an amplifier 6 which amplifies an electric signal VS1, and outputs a position signal VP corresponding to an adjusting position of the gain adjusting means 7. The judging means 4 is equipped with the comparison operating means 12 which can adjust a reference value VK1 and a hysteresis widthΔV1. On the basis of the position signal VP supplied from the gain adjusting means 7, either or both of the reference value VK1 and the hysteresis widthΔV1 are adjusted.