| 摘要 |
PURPOSE:To prevent the erroneous control operation of a watch adapter due to the noises generated at the opening and closing of the power source in the case the power source of the display device is turned ON and OFF, by once turning OFF control signal receiving gate of the watch adapter. CONSTITUTION:Receivers 4-6 and AND circuits 7 and 8 are provided at a control signal input part of the watch adatper 2. Drivers 9-11 are provided in a display control signal outputting part of the time display device 3. In the case the power source of the time display device 3 is turned ON, an erroneous operation preventing signal A is made to ''0'' beforehand, and applied to the driver 11 for a specified time period. Then, the AND circuits 7 and 8 are turned OFF, and block the noises generated at the time of turning ON the power source. The same principle is applied when the power source is turned OFF. In this constitution, the erroenous operation of the watch adapter due to the noises generated at the opening and closing the power source can be prevented. |
