| 摘要 |
PROBLEM TO BE SOLVED: To achieve an inexpensive power circuit switchgear of an apparatus related to a mechanical device having an operation indicator lamp, that photodetects lighting display of a prescribed color change part of a display lamp for displaying the operation state of a mechanical device, opens and closes the power circuit in response to subsequent needs for operation of the apparatus related to a mechanical device, and can be readily mounted even during operation. SOLUTION: An electric circuit of a power circuit switchgear, which is included in an apparatus related to a mechanical device having an operation indicator lamp, comprises a power supply 20 which generates direct voltage from a power receptacle S1, an optical detection signal generating section 30 which performs optical detection by a cadmium sulfide optical detection element 11 and outputs a detection signal, a drive signal generating section 40 which outputs a drive signal in response to a detection signal, a power circuit opening/closing section 60a which opens and closes the passage of current to a power receptacle S2 of a CRT display device 9 in response to a driving signal, and a timer 50 which is operated in response to the drive signal. |
