| 摘要 |
PROBLEM TO BE SOLVED: To provide a multiple optical-axis photoelectric sensor capable of accurately adjusting optical axes even if an object other than one to be detected exists. SOLUTION: When a high-level signal of a clock-pulse signal is detected (at a step S2 'Y'), a photoreceptive signal from a photoreceptive element 21 of a first optical axis is validated and its photoreception volume level is read at a step S3, and it can be recognized whether the photoreceptive volume level at the photoreceptive element of the first optical axis is more than a threshold value V2 for optical axis assignment, on the basis of an output signal from a second comparator 29. Such a process is executed in turn up to a 24th optical axis, a minimum photoreception volume level is extracted from among ones exceeding the threshold value V2 at a step S6, and display of an optical axis adjustment display part 30 is controlled by a display pattern in accordance with the minimum photoreception volume level. COPYRIGHT: (C)2005,JPO&NCIPI
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