| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a circuit which can accurately read the states of a plurality of photointerrupters, using a single analog/digital converter. <P>SOLUTION: A photointerrupter reading circuit comprises a series-parallel circuit, having resistances connected in parallel with respective phototransistors of a plurality of photointerrupters, the phototransistors that are connected in series with a pull-up resistance R104, and an analog/digital converter for analog/digital conversion at a common connection point between the pull-up resistance and the phototransistors to a digital potential. In the photointerrupter reading circuit, a voltage applied to the series-parallel circuit is made larger than the reference voltage of the analog/digital converter. <P>COPYRIGHT: (C)2007,JPO&INPIT</p> |
