| 摘要 |
PURPOSE:To reduce a current consumption by turning off the power source of a photodetecting circuit which operates the signal processing of the output from a photodiode if unnecessary. CONSTITUTION:A discriminating means 17 of a photodetecting circuit 11 discriminates whether or not an identification code transmitted from an outside controller is coincident with the identification code of its own stored in a storage means 14. When the means 17 judges that the identification code transmitted from the outside controller is coincident with the identification code of its own, the power source of the photodetecting circuit 11 is turned on, and the output through a communication means 18 to the outside controller is operated. Therefore, the power source of the photodetecting circuit 11 can be turned off if unnecessary. Thus, the current consumption can be reduced. |
