| 摘要 |
PROBLEM TO BE SOLVED: To provide a photoelectric sensor device having excellent handleability capable of simplifying a wiring work by realizing automatic regulation of a photodetecting sensitivity in response to an aging photodetecting level change, and eliminating the necessity of grasping an operating state and instructing a sensitivity regulation. SOLUTION: The photoelectric sensor device includes a light emitting unit and a photodetector for forming a predetermined optical path. The photoelectric sensor device photodetects the light emitted from the light emitting unit or its reflected light by the photodetector, and detects the optical state in the optical path from the photodetecting level or more concretely the invasion of an object. The photoelectric sensor device further includes a comparator for comparing the photodetecting level of the photodetector with a predetermined threshold value to output a signal showing the presence or absence of the object, and a calibrating means for calibrating the threshold value according to the photodetecting level by the photodetector at timing of elapsing a predetermined time from the rise and/or fall timing of the signal output from this comparator. COPYRIGHT: (C)2005,JPO&NCIPI
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