| 摘要 |
<p>PURPOSE:To avoid mis-detection due to the current fluctuation in a light emitting means by outputting a detection output while taking a current flowing to the light emitting means and a current flowing to a light receiving means into consideration. CONSTITUTION:This circuit is constituted of a light emitting diode 101, a resistor 102 for detecting a current flowing to the light emitting diode 101, a phototransistor 103 and a resistor 104 for detecting a current flowing to the phototransistor 103. Thus, a detecting output is outputted by taking also a current flowing to the light emitting diode 101 into consideration. Thus, mis-detection is prevented even when the current flowing to the light emitting diode 101 is changed due to the change in the temperature characteristic of the light emitting diode 101 or the fluctuation of the power voltage.</p> |
