| 摘要 |
PURPOSE:To superpose a synchronizing signal upon an endoscope light metering signal through a simple constitution, by connecting a capacitor which discharges the synchronizing signal to a light metering signal output line through a switch which is closed associatively with the shutter release of a camera. CONSTITUTION:When a release switch 17 is closed associatively with th shutter release of an endoscope camera, capacitor 30 connected to a light metering signal line 11 through a resistance 38 is discharged to superpose the negative synchronizing signal upon the light metering signal line 11, performing switching between a light source for observation and a light source for photography. Consequently, a synchronizing signal generating circuit of a simple constitution which generates the synchronizing signal to be superposed upon the endoscope light metering signal is obtained. |
