| 摘要 |
A photoelectric sensor has a light emitting section, a light receiving section, an amplification circuit for amplifying an electric signal from the light receiving section, an A/D converter for converting an output voltage of the amplification circuit into a digital value, and a processing section for controlling the light emitting operation and processing the digital value provided by the A/D converter. In a high-precision mode, the processing section causes the light emitting section to perform the light emitting operation a plurality of times successively, adds a plurality of digital values provided by the A/D converter in response to the light emitting operation performed plurality of times, and processes the digital value of the addition result as a detection value corresponding to the light receiving amount.
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